Battery pack

Abstract

The invention discloses a battery pack, which has a first direction, a second direction and a third direction which are vertical pairwise, the battery pack comprises a battery pack body, the battery pack body comprises a shell, a hoisting cylinder and a battery pack, an accommodating cavity is formed in the shell, the hoisting cylinder penetrates through the upper side wall and the lower side wall of the shell along the first direction, and the battery pack is arranged in the accommodating cavity. A containing cavity is formed in the shell, the two axial ends of the hoisting cylinder are correspondingly connected with the upper side wall and the lower side wall of the shell, a through hole is formed in the hoisting cylinder in the axial direction, the battery pack is arranged in the containing cavity, the battery pack comprises a plurality of single batteries, the single battery closest to the hoisting cylinder is a first battery, and the first battery is a second battery. The distance between the first battery and the hoisting cylinder is ymm, the inner diameter of the through hole is zmm, and y / z is larger than or equal to 0.6 and smaller than or equal to 1.5. The performance and the service life of the battery pack can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] The battery pack is the main carrier of electric vehicles. The battery pack is mostly fixed to the vehicle floor by hanging. Specifically, a hanging tube is provided on the battery pack, and then hanging bolts are inserted into the hanging tube. The hanging bolts are mounted on the vehicle to complete the installation of the battery pack.

[0003] Since the cavity inside the lifting tube belongs to the external space of the battery pack relative to the battery pack, and the lifting tube runs through the battery pack, the batteries in the battery pack can dissipate heat through the lifting tube. The heat exchange rate of the batteries close to the lifting tube in the battery pack is greater than that of the batteries in other positions, which will cause uneven temperature of the entire battery pack in the battery pack, and further cause the consistency of the electrical performance of the battery pack to deteriorate, affecting the performance and life of the battery pack. Summary of the invention

[0004] The object of the present invention is to provide a battery pack to ensure the performance and life of the battery pack.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A battery pack has a first direction, a second direction and a third direction which are perpendicular to each other, and includes a battery pack body, wherein the battery pack body includes:

[0007] A housing having a receiving cavity therein;

[0008] A hanging tube, which penetrates the upper side wall and the lower side wall of the shell along a first direction, and the two ends of the hanging tube along the axial direction are correspondingly connected to the upper side wall and the lower side wall of the shell, and a through hole is formed inside the hanging tube along the axial direction;

[0009] A battery pack is disposed in the accommodating cavity, wherein the battery pack includes a plurality of single cells, and among the plurality of single cells, the single cell closest to the hoisting barrel is a first battery;

[0010] Among them, the distance between the first battery and the hanging tube is ymm, the inner diameter of the through hole is zmm, and 0.6≤y / z≤1.5.

[0011] Compared with the prior art, the battery pack according to the embodiment of the present invention has the following beneficial effects:

[0012] In the present invention, a hanging tube is usually provided on the battery pack body, and then the battery pack body is mounted on the body of the car after passing through the hanging tube with mounting parts such as bolts and screws. On the one hand, since the through hole in the hanging tube belongs to the external space compared to the accommodating cavity inside the battery pack body, the single cell in the accommodating cavity can also exchange heat with the outside through the through hole, and the through hole has a certain influence on the heat dissipation of the single cell in the accommodating cavity. Specifically, among the multiple single cells in the shell, the heat dissipation effect of the single cell close to the through hole is better than that of the single cell far from the through hole, so it is easy to cause uneven temperature of the battery pack, thereby causing the consistency of the electrical performance of the battery pack to deteriorate, and finally affecting the performance and service life of the battery pack. When the diameter of the through hole is larger, the heat dissipation effect of the single cell close to the through hole will be better, so that the consistency of the electrical performance of the battery pack will be worse.

[0013] On the other hand, the diameter of the through hole of the lifting tube also determines the size of the mounting part connected to the vehicle body. The size of the mounting part determines its own carrying capacity and the lifting strength of the battery pack. The larger the diameter of the through hole, the greater the lifting strength of the mounting part to the battery pack.

[0014] When y / z is greater than 1.5, it means that the distance between the first battery and the hoisting tube is too large, and the diameter of the through hole of the hoisting tube is too small. Although the temperature between the battery packs can be uniform and the battery pack performance can be ensured, the hoisting strength of the battery pack is poor. When y / z is less than 0.6, it means that the distance between the first battery and the hoisting tube is too small, and the diameter of the through hole of the hoisting tube is too large. Although the hoisting strength can be ensured, the heat dissipation of the first battery is large, the temperature between the battery packs is uneven, the performance of the battery pack is poor, and the service life is also affected. Therefore, let 0.6≤y / z≤1.5 to ensure the performance of the battery pack and the stability of the connection to the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a top view of the overall structure of an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 Cross-sectional view of the middle BB;

[0017] Figure 3 yes Figure 1 The enlarged view of point A in the middle;

[0018] Figure 4 is a schematic diagram of the dimensions between the hoisting tube, the first battery and the support beam in an embodiment of the present invention;

[0019] Figure 5 It is a schematic diagram of the dimensions of the hoisting tube, the partition and the support beam in the embodiment of the present invention;

[0020] Figure 6 is a schematic diagram of the dimensions of the first hanging tube and the second hanging tube in an embodiment of the present invention;

[0021] Figure 7 Schematic diagram of an explosion-proof valve and a weak part in an embodiment of the present invention.

[0022] In the figure, 1, outer shell; 11, accommodating cavity; 12, shell; 121, bottom plate; 122, frame; 123, weak part; 13, cover;

[0023] 2. Hoisting tube; 21. Through hole; 22. Position limiting portion; 23. First hanging tube; 24. Second hanging tube; 25. Third hanging tube;

[0024] 3. Battery pack; 31. First battery; 311. Box body; 312. Battery core; 313. Explosion-proof valve;

[0025] 4. Support beam; 41. Reinforcement rib; 42. First cavity;

[0026] 5. partition; 51. convex rib; 52. second cavity;

[0027] 6. Heat exchange plate. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it should be understood that the wording "comprising" used in the present specification refers to the presence of the features, integers, steps, operations, parts / components and / or assemblies, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, assemblies and / or their groups. It should be understood that when we say a part / component is "connected" to another part / component, it can be directly connected to the other part / component, or there can be intermediate parts / components. The wording "and / or" used here includes all or any unit and all combinations of one or more associated listed items.

[0030] like Figures 1 to 7As shown, the present invention relates to a battery pack having a first direction, a second direction and a third direction which are perpendicular to each other, comprising a battery pack body, wherein the first direction is the height direction of the battery pack body, the second direction is the width direction of the battery pack body, and the third direction is the length direction of the battery pack body. The battery pack body comprises an outer shell 1, a hanging tube 2 and a battery pack 3, an accommodating cavity 11 is provided inside the outer shell 1, the hanging tube 2 penetrates the upper side wall and the lower side wall of the outer shell 1 along the first direction, and the two ends of the hanging tube 2 along the axial direction are correspondingly connected to the upper side wall and the lower side wall of the outer shell 1, a through hole 21 is formed inside the hanging tube 2 along the axial direction, and the two ends of the through hole 21 penetrate the upper side wall and the lower side wall of the outer shell 1, the battery pack 3 is arranged in the accommodating cavity 11, the battery pack 3 comprises a plurality of single cells, among the plurality of single cells, the single cell closest to the hanging tube 2 is the first battery 31.

[0031] The distance between the first battery 31 and the hoisting tube 2 is y mm, the inner diameter of the through hole 21 is z mm, and 0.6≤y / z≤1.5. Specifically, the value of y / z can be 0.8, 0.9, 1.1, 1.3 or 1.4.

[0032] It should be noted that the first battery 31 can be one or more. When there is only one single cell facing the hanging tube 2, the single cell is the first battery 31. When multiple single cells are arranged side by side and facing the hanging tube 2, and the distances between the multiple single cells and the hanging tube 2 are the same, the multiple single cells are all first batteries 31. When multiple single cells are stacked and the distances between the multiple single cells and the hanging tube 2 are the same, the multiple single cells are all first batteries 31.

[0033] In the present invention, a hanging tube 2 is usually provided on the battery pack body, and then the battery pack body is hung on the body of the car after the hanging tube 2 is passed through by bolts, screws and other mounting parts. On the one hand, since the through hole 21 in the hanging tube 2 belongs to the external space compared with the accommodating cavity 11 inside the battery pack body, the single battery in the accommodating cavity 11 can also exchange heat with the outside through the through hole 21, and the through hole 21 has a certain effect on the heat dissipation of the single battery in the accommodating cavity 11. Specifically, among the multiple single batteries in the housing 1, the heat dissipation effect of the single battery close to the through hole 21 is better than the heat dissipation effect of the single battery far from the through hole 21, so it is easy to cause uneven temperature of the battery pack 3, thereby causing the electrical performance consistency of the battery pack 3 to deteriorate, and finally affecting the performance and service life of the battery pack. When the diameter of the through hole 21 is larger, the heat dissipation effect of the single battery close to the through hole 21 will be better, so that the electrical performance consistency of the battery pack 3 will be worse.

[0034] On the other hand, the diameter of the through hole 21 of the lifting tube 2 also determines the size of the mounting part connected to the vehicle body. The size of the mounting part determines its own carrying capacity and the lifting strength of the battery pack. The larger the diameter of the through hole 21, the greater the lifting strength of the mounting part to the battery pack.

[0035] When y / z is greater than 1.5, it means that the distance between the first battery 31 and the hoisting tube 2 is too large, and the diameter of the through hole 21 of the hoisting tube 2 is too small. Although the temperature between the battery packs 3 can be uniform and the battery pack performance can be ensured, the hoisting strength of the battery pack is poor. When y / z is less than 0.6, it means that the distance between the first battery 31 and the hoisting tube 2 is too small, and the diameter of the through hole 21 of the hoisting tube 2 is too large. Although the hoisting strength can be ensured, the heat dissipation of the first battery 31 is large, the temperature of the battery pack 3 is uneven, the performance of the battery pack is poor, and the service life is also affected. Therefore, let 0.6≤y / z≤1.5 to ensure the performance of the battery pack and the stability of the connection to the vehicle body.

[0036] In some embodiments, the distance between the first battery 31 and the hanging tube 2 is y mm, wherein 11.5 mm≤y≤23.5 mm. Specifically, the value of y can be 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 21 mm or 23 mm.

[0037] When the distance y between the first battery 31 and the hanging tube 2 is too large, although the uniform temperature of the battery pack 3 can be ensured, it will occupy too much space inside the accommodating cavity 11, affecting the energy density of the battery pack. When the distance y between the first battery 31 and the hanging tube 2 is too small, the temperature of the battery pack 3 will be uneven, affecting the performance of the battery pack. Therefore, 11.5mm≤y≤23.5mm is set to balance the energy density and performance of the battery pack.

[0038] In some embodiments, the inner diameter of the through hole 21 is z mm, wherein 16 mm ≤ z ≤ 19 mm. Specifically, the value of z may be 16.5 mm, 17 mm, 18 mm or 18.5 mm.

[0039] When the inner diameter z of the through hole 21 is too large, the size of the lifting tube 2 will also be too large, which will also occupy the space of the accommodating cavity 11. When the inner diameter z of the through hole 21 is too small, the size of the mounting part will also be reduced, thereby affecting the mounting strength of the battery pack.

[0040] In some embodiments, a support beam 4 is also included, wherein the support beam 4 is disposed in the accommodating cavity 11 and extends along the second direction, the battery pack 3 is disposed on both sides of the support beam 4 in the third direction, and the lifting tube 2 at least partially penetrates the support beam 4 along the first direction.

[0041] Specifically, the support beam 4 is arranged in the accommodating cavity 11 and extends along the width direction of the battery pack. The two ends of the support beam 4 are connected to the two side walls opposite to the accommodating cavity 11. The battery pack 3 is provided in the accommodating cavity 11 and on both sides of the support beam 4. The hanging tube 2 penetrates the outer shell 1 along the height direction, and the hanging tube 2 at least partially passes through the support beam 4. That is, the hanging tube 2 is combined with the support beam 4, so that the mounting part can mount the battery pack firmly on the vehicle body through the hanging tube 2.

[0042] In some embodiments, a plurality of reinforcing ribs 41 are provided in the support beam 4, and a plurality of the reinforcing ribs 41 form a plurality of first cavities 42 in the support beam 4, the lifting tube 2 is located in one of the first cavities 42, and there is a gap between the outer side of the lifting tube 2 and the inner side of the first cavity 42.

[0043] That is, the lifting tube 2 passes through the support beam 4, and the first cavity 42 completely surrounds the support beam 4, so that the first cavity 42 can play a role of heat insulation, reducing the heat exchange between the first battery 31 and the through hole 21 of the lifting tube 2, which is beneficial to ensure the uniform temperature of the battery pack.

[0044] In some embodiments, the distance between the side of the support beam 4 facing the first battery 31 and the first battery 31 is Mmm, wherein 0.26≤(yM) / z≤0.6, 6.5mm≤M≤14mm. Specifically, the value of (yM) / z can be 0.28, 0.3, 0.32, 0.35, 0.37, 0.39, 0.4, 0.42, 0.44, 0.46, 0.48, 0.5, 0.52, 0.55, 0.58 or 0.59; the value of M can be 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm or 13.5mm.

[0045] When (yM) / z is too large, it means that the size of the first cavity 42 in the support beam 4 is too large, which will lead to insufficient structural strength of the support beam 4. The support beam 4 is easily crushed and deformed under the continuous pressure of the load. When (yM) / z is too small, it means that the size of the lifting tube 2 is large but the size of the first cavity 42 is small, which can easily increase the heat transfer efficiency between the first battery 31 and the lifting tube 2, which is not conducive to the uniform temperature of the battery pack 3. Therefore, 0.26≤(yM) / z≤0.6 is maintained to ensure the structural strength of the support beam 4, ensure the uniform temperature of the battery pack 3, and ensure the stability and performance of the battery pack.

[0046] In some embodiments, the distance between the hoisting tube 2 and the inner wall of the first cavity 42 facing away from the first battery 31 is d mm, where 5 mm ≤ d ≤ 9.5 mm. Specifically, the value of d can be 5.5 mm, 6 mm, 7 mm, 8 mm or 9 mm.

[0047] That is, 5 mm ≤ d ≤ 9.5 mm is maintained, so as to reduce the heat transfer between the first battery 31 and the hanging tube 2 and avoid the hanging tube 2 and the first cavity 42 being too far away from the inner wall of the first battery 31 to cause insufficient arrangement space.

[0048] In some embodiments, the distance between the hoisting tube 2 and one side of the support beam 4 in the third direction is the same as the distance between the hoisting tube 2 and the other side of the support beam 4 in the third direction.

[0049] That is, the distance between the hoisting tube 2 and one wide side wall of the support beam 4 is the same as the distance between the hoisting tube 2 and the other wide side wall of the support beam 4, so that the hoisting tube 2 is located in the middle position of the support beam 4 along the width direction, thereby making the structure symmetrical and improving the stability of the battery pack mounting.

[0050] In some embodiments, the thickness of the side wall of the hoisting tube 2 is T1 mm, wherein 2≤z / T1≤5.5. Specifically, the value of z / T1 can be 2.5, 3, 3.5, 4, 4.5 or 5.

[0051] When z / T1 is too large, it means that the side wall of the hoisting tube 2 is thinner, and the diameter of the through hole 21 of the hoisting tube 2 is large. On the one hand, it makes the heat transfer between the first battery 31 and the hoisting tube 2 easier, and on the other hand, the mechanical strength of the hoisting tube 2 itself and the sealing strength with the shell 1 are insufficient; when z / T1 is too small, it means that the side wall of the hoisting tube 2 is thicker, and the diameter of the through hole 21 of the hoisting tube 2 is small, then the size of the mounting part inserted into the through hole 21 is also small, and the mounting strength of the battery pack is weak, affecting the stability of the battery pack on the vehicle body. Therefore, keeping 2≤z / T1≤5.5 can reduce the heat transfer between the hoisting tube 2 and the first battery 31, and also ensure the mounting strength of the battery pack.

[0052] In some embodiments, the thickness of the side wall of the hanging tube 2 is T1 mm, 3.5 mm ≤ T1 ≤ 8 mm. Specifically, the value of T1 can be 4 mm, 4.5 mm, 5 mm, 6 mm, 7 mm or 7.5 mm.

[0053] When T1 is too large, the weight of the lifting tube 2 will also be large, which is not conducive to the lightweight of the battery pack, and more single cells cannot be arranged, which will affect the improvement of the energy density of the battery pack; when T1 is too small, it is not conducive to the heat insulation between the first battery 31 and the lifting tube 2. Therefore, 3.5mm≤T1≤8mm is maintained to ensure the energy density of the battery pack, ensure the uniform temperature of the battery group 3, and ensure the performance of the battery pack.

[0054] In some embodiments, the battery pack body further includes a partition 5, the partition 5 is disposed between the support beam 4 and the first battery 31, and the thermal conductivity of the partition 5 is k1W / (mK), wherein k1≤0.46W / (mK). Specifically, the value of K1 can be 0.1, 0.15, 0.18, 0.22, 0.25, 0.28, 0.3, 0.33, 0.35, 0.38, 0.4, 0.42, 0.44 or 0.45.

[0055] Since the partition 5 has a heat insulating effect and the thermal conductivity k1 of the partition 5 is ≤0.46 W / (mK), the heat transfer between the first battery 31 and the hanging tube 2 can be reduced.

[0056] In some embodiments, the distance between the first battery 31 and the hanging tube 2 is y mm, and the inner diameter of the through hole 21 is z mm, wherein 0.7≤y / z≤1.1, 15 mm≤y≤17 mm.

[0057] Since there is a partition 5 between the support beam 4 and the first battery 31 for heat insulation, the distance between the first battery 31 and the lifting tube 2 can be reduced, which is beneficial to improving the space utilization inside the battery pack and reducing the size of the support beam 4 in the width direction, which is beneficial to improving the energy density of the battery pack.

[0058] In some embodiments, in the first direction, the partition 5 extends upward beyond the upper end surface of the support beam 4, wherein 0.65≤y / z≤0.95, 13mm≤y≤15mm.

[0059] That is, in the height direction, the upper end of the partition 5 extends upward and exceeds the upper end surface of the support beam 4, so that the partition 5 can completely cover the heat transfer surface of the support beam 4 toward the first battery 31, further reducing the heat transfer between the first battery 31 and the support beam 4, and can make the distance between the first battery 31 and the lifting tube 2 smaller, which is beneficial to improve the energy density of the battery pack.

[0060] In some embodiments, in the first direction, the separator 5 extends upward beyond the upper end surface of the first battery 31, 0.6≤y / z≤0.68, 11.5mm≤y≤13mm.

[0061] That is, in the height direction, the upper end of the partition 5 extends upward and exceeds the upper end surface of the first battery 31, so that the partition 5 completely covers the heat transfer surface of the first battery 31 facing the hanging tube 2, and the heat insulation effect is better, which can make the distance between the first battery 31 and the hanging tube 2 smaller, so as to help improve the energy density of the battery pack.

[0062] In some embodiments, in the third direction, the thickness of the partition 5 is T2 mm, wherein 5 mm ≤ T2 ≤ 13 mm. Specifically, the value of T2 can be 5.5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm or 12.5 mm.

[0063] That is, the thickness of the partition 5 is maintained at 5 mm-13 mm, so as to avoid the partition 5 being too thick to occupy too much space, and to avoid the partition 5 being too thin to affect the heat insulation effect.

[0064] In some embodiments, a plurality of ribs 51 are provided on the side of the partition 5 facing the support beam 4 , and the ribs 51 are in contact with the support beam 4 , and a plurality of second cavities 52 are formed between the ribs 51 , the partition 5 and the support beam 4 .

[0065] A second cavity 52 is formed between the partition 5 and the support beam 4 , which helps to reduce the heat transfer from the first battery 31 to the support beam 4 and the hanging tube 2 , and ensures that the temperature of the battery pack 3 is uniform.

[0066] In some embodiments, a fixing glue layer is provided in the second cavity 52 , and the partition 5 is fixed to the support beam 4 through the fixing glue layer.

[0067] The fixing adhesive layer may be structural adhesive or double-sided adhesive to fix the partition plate 5 and the support beam 4 together.

[0068] In some embodiments, the battery pack 3 abuts against the partition 5, and the inner diameter of the through hole 21 is z mm, wherein 16 mm≤z≤17 mm.

[0069] Since the fixed adhesive layer bonds the partition 5 and the support beam 4 together, and the battery pack 3 is in contact with the partition 5, there are more paths for force transmission and the force acts on a larger area. Therefore, while ensuring the stability of the structure, the inner diameter of the through hole 21 can be reduced, which is beneficial to improving the energy density of the battery pack.

[0070] In some embodiments, at least one of the convex ribs 51 and the reinforcing ribs 41 in the support beam 4 are staggered, and the wall thickness of the support beam 4 is T3mm, wherein T3≥2mm. Specifically, the value of T3 can be 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.8mm or 6mm.

[0071] Since the convex rib 51 on the partition 5 and the reinforcing rib 41 in the support beam 4 are staggered, that is, the first cavity 42 and the second cavity 52 are also staggered, which is beneficial to improve the overall structural strength of the battery pack. At the same time, since the convex rib 51 and the reinforcing rib 41 act on the support beam 4 at different positions, it is necessary to increase the wall thickness of the support beam 4 so that the wall thickness of the support beam 4 is greater than 2 mm, thereby ensuring the strength of the support beam 4.

[0072] In some embodiments, the plurality of reinforcing ribs 41 in the support beam 4 and the plurality of convex ribs 51 on the partition plate 5 are arranged one by one opposite to each other.

[0073] Since the convex rib 51 on the partition 5 and the reinforcing rib 41 in the support beam 4 are arranged opposite to each other, that is, the first cavity 42 and the second cavity 52 are also opposite to each other, the force transmission path is shorter, so that the mounting force applied by the mounting part on the lifting tube 2 is directly dispersed through the reinforcing rib 41, making the support beam 4 not easy to deform, and ensuring the stability of the battery pack mounted on the vehicle body.

[0074] In some embodiments, the interior of the first cavity 42 and / or the second cavity 52 is filled with a heat insulating medium, thereby further reducing the heat transfer between the first battery 31 and the lifting tube 2 to ensure uniform temperature of the battery pack 3 and ensure the performance and life of the battery pack.

[0075] In some embodiments, a buffer is provided between the partition 5 and the first battery 31 .

[0076] Specifically, a buffer is provided between the battery pack 3 and the partition 5. The buffer may be foam or a buffer rubber layer. On the one hand, the buffer has a heat insulating effect. On the other hand, when the battery pack is assembled, the battery pack 3 and the partition 5 compress the buffer, and then insert it into the outer shell 1 of the battery pack body. Then the buffer expands to stabilize the battery pack 3 in the outer shell 1.

[0077] In some embodiments, in the third direction, the thickness of the buffer is T4 mm, wherein 1.5 mm ≤ T4 ≤ 4 mm. Specifically, the value of T4 can be 1.7 mm, 1.9 mm, 2 mm, 2.2 mm, 2.4 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, 3.2 mm, 3.4 mm, 3.5 mm, 3.7 mm or 3.9 mm.

[0078] The buffer has certain heat-insulating properties. When the thickness of the buffer is too large, it will occupy too much space in the accommodating cavity 11. When the thickness of the buffer is too small, the heat-insulating effect is poor. Therefore, the thickness of the buffer is maintained between 1.5mm-4mm to ensure that the energy density of the battery pack is not affected and has certain heat-insulating properties.

[0079] In some embodiments, a connecting adhesive layer is provided between the hoisting tube 2 and the first battery 31, and the thermal conductivity of the connecting adhesive layer is k2 W / (mK), wherein k2≤0.8W / (mK). Specifically, the value of k2 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 or 0.7.

[0080] Specifically, the connecting adhesive layer can be arranged between the partition 5 and the first battery 31, or between the support beam 4 and the partition 5, so as to improve the mode of the battery module, which is beneficial to reduce the misalignment of the battery cell 312 after the battery pack vibrates in the height direction. The thermal conductivity k2 between the lifting tube 2 and the first battery 31 is ≤0.8W / (mK), so that the connecting adhesive layer has a heat insulating effect.

[0081] In some embodiments, the largest side of the first battery 31 faces the support beam 4, wherein 0.6≤y / z≤1.1.

[0082] When the largest side surface of the first battery 31 in the single battery faces the support beam 4, the first battery 31 transfers more heat to the hoisting tube 2. In order to ensure the uniform temperature of the battery pack 3, it is necessary to maintain 0.6≤y / z≤1.1.

[0083] In some embodiments, the first battery 31 includes a box body 311 and a battery cell 312, wherein the battery cell 312 is disposed in the box body 311, and in a first direction, the height of the battery cell 312 is h1 mm, and the height of the box body 311 is h2 mm, wherein h1 / h2≤0.98. Specifically, the value of h1 / h2 may be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.95.

[0084] That is, the ratio of the height of the battery cell 312 to the height of the box body 311 is less than 0.98, so that the height of the battery cell 312 is smaller than the height of the box body 311 , thereby reducing the heat transfer between the largest side surface of the first battery 31 and the hanging tube 2 .

[0085] In some embodiments, the lower end of the hoisting tube 2 extends toward the third direction to form a limiting portion 22 , and the limiting portion 22 exceeds the side of the support beam 4 facing the first battery 31 .

[0086] The lower end of the lifting tube 2 extends toward the length direction of the battery pack to form a limiting portion 22, and the limiting portion 22 exceeds the support beam 4, that is, the limiting portion 22 can support the support beam 4 to apply the mounting force to the support beam 4, which is beneficial to the dispersion of force and makes the mounting of the battery pack more stable.

[0087] In some embodiments, the limiting portion 22 extends toward the third direction and exceeds the side of the partition 5 facing the first battery 31 .

[0088] That is, the limit portion 22 continues to extend in the length direction of the battery pack and exceeds the side of the partition 5 facing the first battery 31, so that the limit portion 22 can form an effective support for the partition 5, and the mounting force can be applied to the support beam 4 and the partition 5, which is more conducive to the dispersion of force, thereby making the mounting of the battery pack more stable.

[0089] In some embodiments, a projection of the limiting portion 22 in the first direction partially overlaps with a projection of the first battery 31 in the first direction.

[0090] That is, the limiting portion 22 continues to extend in the length direction of the battery pack and extends to the battery pack 3, so that the limiting portion 22 can also form effective support for the battery pack 3, allowing the mounting force to be applied to the support beam 4 partition 5 and the battery pack 3, which is more conducive to the dispersion of force, thereby making the mounting of the battery pack more stable.

[0091] In some embodiments, in the third direction, the width of the limit portion 22 is wmm, and in the first direction, the height of the support beam 4 is h3mm, wherein 0.15≤w / h3≤0.29, 15mm≤w≤20mm, and 70mm≤h3≤95mm. Specifically, the value of w can be 15.5mm, 16mm, 17mm, 18mm, 19mm or 19.5mm; the value of h3 can be 72mm, 74mm, 78mm, 80mm, 82mm, 85mm, 87mm, 89mm, 90mm, 92mm, 93mm or 94mm; the value of w / h3 can be 0.17, 0.19, 0.2, 0.22, 0.24, 0.26 or 0.28.

[0092] Specifically, if the ratio of w / h3 is too small, the width of the limiting portion 22 along the length direction of the battery pack is smaller, and the height of the support beam 4 is higher. Since the limiting portion 22 is the component that directly bears the mounting force of the mounting part, the smaller width of the limiting portion 22 is not conducive to dispersing the force. Excessive concentration of force will cause the components in the battery pack thereon to be crushed. If the height of the support beam 4 is too high, the center of gravity of the battery pack will be higher, making the overall stability of the battery pack poor. When the ratio of w / h3 is too large, the width of the limiting portion 22 along the length direction of the battery pack is larger, so that the limiting portion 22 can disperse the force to the supporting beam 4, partition 5 and battery pack 3 and other components of the battery pack, making the battery pack structure more stable. However, the height of the support beam 4 is relatively short, and the lifting tube 2 cannot be completely hidden in the first cavity 42, which will affect the thermal insulation between the lifting tube 2 and the first battery 31, thereby failing to ensure the uniform temperature of the battery pack 3 and the performance and service life of the battery pack.

[0093] In some embodiments, a support plate is provided between the limiting portion 22 and the first battery 31 , so as to further disperse the mounting force and make the structure of the battery pack more stable.

[0094] Preferably, the support plate is a heat exchange plate 6, the battery pack 3 is pressed onto the heat exchange plate 6, and the distance between the hoisting tube 2 and the inner wall of the first cavity 42 facing away from the first battery 31 is d mm, wherein 7 mm ≤ d ≤ 9.5 mm.

[0095] Due to the setting of the heat exchange plate 6, the first battery 31 of the battery pack 3 can exchange heat through the heat exchange plate 6. Therefore, in order to avoid excessive heat loss of the first battery 31, it is necessary to increase the distance d between the hanging tube 2 and the inner wall of the first cavity 42 facing away from the first battery 31, and maintain 7mm≤d≤9.5mm to avoid more heat loss through the through hole 21 of the hanging tube 2. In addition, the distance d between the hanging tube 2 and the inner wall of the first cavity 42 facing away from the first battery 31 cannot be too large to avoid occupying too much space and affecting the energy density of the battery pack.

[0096] In one embodiment, the heat exchange plate 6 is disposed in the accommodating cavity 11 of the outer shell 1 and is pressed onto the bottom plate 121 of the outer shell 1. The limiting portion 22 is located between the heat exchange plate 6 and the bottom plate 121 of the outer shell 1 to disperse the mounting force and make the structure of the battery pack more stable.

[0097] In another embodiment, the bottom of the heat exchange plate 6 is thickened along the height direction of the battery pack to serve as the bottom plate 121 of the outer shell 1. The limiting portion 22 is located at the bottom outside the outer shell 1 and supported on the bottom of the heat exchange plate 6, so as to disperse the mounting force and make the battery pack more stable.

[0098] In some embodiments, the support plate is the bottom plate 121 of the outer shell 1, and the limiting portion 22 is located at the bottom outside the outer shell 1 and supported on the bottom of the bottom plate 121 of the outer shell 1, so as to also disperse the mounting force and stabilize the structure of the battery pack.

[0099] In some embodiments, the housing 1 includes a shell 12 and a cover 13, the shell 12 has an opening at the top, the shell 12 includes a bottom plate 121 and a frame 122, the frame 122 is arranged around the outer periphery of the bottom plate 121, the cover 13 is arranged on the opening of the shell 12, and the accommodating cavity 11 is formed between the bottom plate 121 and the frame 122.

[0100] The hanging tube 2 includes a first hanging tube 23 and a second hanging tube 24 which are arranged in sequence along a first direction. The first hanging tube 23 is arranged between the support beam 4 and the cover body 13, and the two ends of the first hanging tube 23 are correspondingly connected to the opposite sides of the cover body 13 and the support beam 4. The second hanging tube 24 is passed through the support beam 4 along the first direction, one end of the second hanging tube 24 is connected to the bottom plate 121 of the shell 12, and the other end of the second hanging tube 24 is sealed and connected to the first hanging tube 23.

[0101] In the first direction, the height of the second hanging tube 24 is amm, and the height of the first hanging tube 23 is bmm, wherein 40≤(a / b)*z≤77.9, 100mm≤a≤110mm, and 27mm≤b≤40mm. Specifically, the value of a can be 101mm, 102mm, 104mm, 106mm, 108mm, or 109mm; the value of b can be 28mm, 30mm, 32mm, 34mm, 35mm, 37mm, 38mm, or 39mm; the value of (a / b)*z can be 42, 45, 48, 50, 52, 54, 55, 58, 60, 62, 64, 66, 68, 70, 71, 73, 75, 76, or 77.

[0102] Since the mounting member passes through the first hanging tube 23 and the second hanging tube 24, and the lower end of the mounting member is supported on the lower end of the second hanging tube 24, the second hanging tube 24 is the main load-bearing component, and the weight of the battery pack is mainly borne on the second hanging tube 24. Therefore, when a / b is larger, the height of the second hanging tube 24 is larger relative to the first hanging tube 23, and the bearing capacity of the second hanging tube 24 is larger, so the inner diameter z of the through hole 21 is reduced, and the hanging strength of the battery pack can also be ensured. Therefore, 40≤(a / b)*z≤77.9 is maintained, and the height a of the second hanging tube 24, the height b of the first hanging tube 23 and the inner diameter z of the through hole 21 are comprehensively considered to allow the hanging tube 2 to have a suitable hanging strength.

[0103] Preferably, the lifting tube 2 also includes a third lifting tube 25, which is sleeved on the outer side of one end of the first lifting tube 23 away from the second lifting tube 24, and the first lifting tube 23 and the third lifting tube 25 are threadedly connected, and the end of the third lifting tube 25 away from the first lifting tube 23 is located outside the outer shell 1 and abuts against the upper end surface of the cover body 13.

[0104] The hanging tube 2 includes a first hanging tube 23, a second hanging tube 24 and a third hanging tube 25 connected together. Since the first hanging tube 23 is located in the outer shell 1, in order to facilitate the fixation of the upper end of the first hanging tube 23, the third hanging tube 25 is provided. The lower end of the third hanging tube 25 penetrates into the outer shell 1 and is threadedly connected and fixed with the first hanging tube 23 to maintain the stability of the two. Then the upper end of the third hanging tube 25 abuts against the upper end surface of the cover body 13, so that the hanging tube 2 can be firmly fixed on the battery pack body, and it is also easy to ensure the sealing of the hanging tube 2 and the battery pack body.

[0105] In some embodiments, the housing 1 includes a shell 12 and a cover 13, the shell 12 has an opening at the top, the shell 12 includes a bottom plate 121 and a frame 122, the frame 122 is arranged around the outer periphery of the bottom plate 121, the cover 13 is arranged on the opening of the shell 12, and the accommodating cavity 11 is formed between the bottom plate 121 and the frame 122.

[0106] The hanging tube 2 includes a first hanging tube 23 and a second hanging tube 24 arranged in sequence along a first direction, one end of the first hanging tube 23 is connected to the cover body 13, the other end of the first hanging tube 23 extends into the support beam 4 along the first direction, the second hanging tube 24 is penetrated into the support beam 4 along the first direction, one end of the second hanging tube 24 is connected to the bottom plate 121 of the shell 12, the other end of the second hanging tube 24 is sleeved outside the end of the first hanging tube 23 extending into the support beam 4, and the first hanging tube 23 and the second hanging tube 24 are threadedly connected.

[0107] In the first direction, the height of the support beam 4 is h3 mm, wherein 0.15≤z / h3≤0.3. Specifically, the value of z / h3 can be 0.16, 0.18, 0.2, 0.22, 0.24, 0.25, 0.27, 0.28 or 0.29.

[0108] After the battery pack is mounted on the body of the car, vibration will occur during the driving of the car, and the vibration will be transmitted to the battery pack, causing the battery pack to vibrate as well. Since the main force-bearing component of the battery pack is the lifting tube 2, and the lifting tube 2 is located at the support beam 4, the support beam 4 is greatly affected by the vibration. The higher the height of the support beam 4, the greater the risk of deformation of the support beam 4. In order to disperse the force more and reduce the risk of deformation of the support beam 4, the size of the mounting part can be increased, that is, the size of the inner diameter z of the through hole 21 can be increased. Therefore, 0.15≤z / h3≤0.3 is maintained, and the ratio of the inner diameter z of the through hole 21 to the height h3 of the support beam 4 is maintained within a certain range, so as to help improve the stability of the battery pack mounting.

[0109] In some embodiments, in the first direction, the second hanging tube 24 passes upward through the side of the support beam 4 facing the cover body 13, and the second hanging tube 24 is sealed and connected to the first hanging tube 23. In the first direction, the height of the support beam 4 is h3mm, wherein 0.2≤a / h3≤0.6. Specifically, the value of a / h3 can be 0.22, 0.24, 0.26, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, 0.42, 0.45, 0.48, 0.5, 0.52, 0.54, 0.56, 0.58 or 0.59.

[0110] Specifically, the first hanging cylinder 23 and the second hanging cylinder 24 are threadedly connected to achieve sealing between the two. Since the second hanging cylinder 24 passes upward through the upper end surface of the support beam 4, if the size of the second hanging cylinder 24 along the height direction of the battery pack is too small, the threaded connection between the first hanging cylinder 23 and the second hanging cylinder 24 is not easy, and when the height of the support beam 4 is too high, the center of gravity will be too high, resulting in structural instability of the battery pack. Therefore, 0.2≤a / h3≤0.6 is maintained to facilitate the assembly of the hanging cylinder 2 and ensure the stability of the battery pack.

[0111] In some embodiments, the hanging tube 2 also includes a third hanging tube 25, which is inserted into the interior of the end of the first hanging tube 23 away from the second hanging tube 24, and the first hanging tube 23 and the third hanging tube 25 are threadedly connected, and the end of the third hanging tube 25 away from the first hanging tube 23 is located outside the outer shell 1 and abuts against the upper end surface of the cover body 13.

[0112] That is, after the third hanging tube 25 is inserted into the first hanging tube 23 and is threadedly connected with the first hanging tube 23, the third hanging tube 25 abuts against the upper end surface of the cover body 13, and the first hanging tube 23 abuts against the lower end surface of the cover body 13. The first hanging tube 23 and the third hanging tube 25 clamp the cover body 13 together, so that the hanging tube 2 can be stably installed on the battery pack and the installation is faster.

[0113] In some embodiments, the housing 1 includes a shell 12 and a cover 13, the shell 12 has an opening at the top, the shell 12 includes a bottom plate 121 and a frame 122, the frame 122 is arranged around the outer periphery of the bottom plate 121, the cover 13 is arranged on the opening of the shell 12, and the accommodating cavity 11 is formed between the bottom plate 121 and the frame 122.

[0114] An explosion-proof valve 313 is provided on the side of the first battery 31 facing the bottom plate 121. A weak portion 123 is formed on the bottom plate 121 at a position corresponding to the explosion-proof valve 313. The distance between the weak portion 123 and the hoisting tube 2 is cmm, wherein 240≤c*z≤760. Specifically, the value of c*z can be 250, 280, 300, 320, 350, 380, 400, 430, 450, 480, 500, 530, 550, 580, 600, 620, 650, 670, 690, 700, 720, 740 or 750.

[0115] When the explosion-proof valve 313 explodes and breaks through the weak part 123, the structural strength of the bottom plate 121 will weaken, and the lifting tube 2 is the main load-bearing component of the battery pack, so when the weak part 123 is too close to the lifting tube 2, it will affect the stability of the battery pack. At the same time, the larger the inner diameter z of the through hole 21 of the lifting tube 2, the larger the mounting part, the more dispersed the force, and the more stable the battery pack. Therefore, by comprehensively considering the distance between the weak part 123 and the lifting tube 2 and the inner diameter z of the through hole 21 of the lifting tube 2, maintain 240≤c*z≤760 to ensure the stability of the battery pack structure.

[0116] In some embodiments, the distance between the weak portion 123 and the hanging tube 2 is cm, 15mm≤c≤40mm. Specifically, the value of c can be 17mm, 19mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, 35mm, 37mm, 38mm and 39mm.

[0117] If the distance c between the weak portion 123 and the lifting tube 2 is too small, the structural strength of the lifting tube 2 will be affected after the explosion-proof valve 313 explodes. If the distance c between the weak portion 123 and the lifting tube 2 is too large, it will be unfavorable to improve the utilization rate of the space in the battery pack. Therefore, 15mm≤c≤40mm is maintained to ensure the structural strength of the lifting tube 2 while improving the space utilization rate.

[0118] In some embodiments, the distance between the weak portion 123 and the limiting portion 22 of the hanging tube 2 is emm, wherein 5mm≤e≤20mm. Specifically, the value of e can be 6mm, 7mm, 9mm, 10mm, 12mm, 14mm, 16mm, 17mm, 18mm or 19mm.

[0119] If the distance e between the weak portion 123 and the limiting portion 22 is too small, the structural strength of the lifting tube 2 will be affected after the explosion-proof valve 313 explodes. If the distance e between the weak portion 123 and the limiting portion 22 is too large, it will be unfavorable to improve the utilization rate of the space in the battery pack. Therefore, 5mm≤e≤20mm is maintained to ensure the structural strength of the lifting tube 2 while improving the space utilization rate.

[0120] It should be noted that the bottom plate 121 of the battery pack is provided with scratches in the area corresponding to the explosion-proof valve 313 of the first battery 31 to weaken the structural strength of the area, thereby forming the weak portion 123, or a groove is opened on the bottom plate 121 of the battery pack to also weaken the structural strength to form the weak portion 123.

[0121] In some embodiments, the weight of the battery pack body is gkg, wherein g>160kg, 0.6≤y / z≤1.5. Specifically, the value of g can be 170kg, 190kg, 200kg, 220kg, 240kg, 250kg, 270kg, 290kg or 300kg.

[0122] Since the heavier the battery pack body is, the more battery packs 3 there are in the battery pack body, so the requirements for the carrying capacity of the mounting component and the average temperature of the battery pack are higher, so it is necessary to maintain 0.6≤y / z≤1.5.

[0123] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A battery pack having a first direction, a second direction and a third direction which are perpendicular to each other, characterized in that: The battery pack body includes: A housing having a receiving cavity therein; A hanging tube, which penetrates the upper side wall and the lower side wall of the shell along a first direction, and the two ends of the hanging tube along the axial direction are correspondingly connected to the upper side wall and the lower side wall of the shell, and a through hole is formed inside the hanging tube along the axial direction; A battery pack is disposed in the accommodating cavity, wherein the battery pack includes a plurality of single cells, and among the plurality of single cells, the single cell closest to the hoisting barrel is a first battery; Among them, the distance between the first battery and the hanging tube is ymm, the inner diameter of the through hole is zmm, and 0.6≤y / z≤1.

5.

2. The battery pack according to claim 1, characterized in that: 11.5mm≤y≤23.5mm.

3. The battery pack according to claim 1, characterized in that: 16mm≤z≤19mm.

4. The battery pack according to claim 1, characterized in that: It also includes a support beam, which is arranged in the accommodating cavity and extends along the second direction. The battery pack is arranged on both sides of the support beam in the third direction, and the lifting tube at least partially penetrates the support beam along the first direction.

5. The battery pack according to claim 4, characterized in that: A plurality of reinforcing ribs are arranged in the support beam, and a plurality of first cavities are formed in the support beam by the plurality of reinforcing ribs. The hanging tube is located in one of the first cavities, and there is a gap between the outer side of the hanging tube and the inner side of the first cavity.

6. The battery pack according to claim 4, characterized in that: The distance between the side of the support beam facing the first battery and the first battery is Mmm, wherein 0.26≤(yM) / z≤0.

6.

7. The battery pack according to claim 5, characterized in that: The distance between the lifting tube and the inner wall of the first cavity facing away from the first battery is d mm, wherein 5 mm≤d≤9.5 mm.

8. The battery pack according to claim 5, characterized in that: The distance between the hoisting tube and one side of the support beam in the third direction is the same as the distance between the hoisting tube and the other side of the support beam in the third direction.

9. The battery pack according to claim 1, characterized in that: The thickness of the side wall of the lifting tube is T1 mm, wherein 2≤z / T1≤5.

5.

10. The battery pack according to claim 9, characterized in that: 3.5mm≤T1≤8mm.

11. The battery pack according to claim 5, characterized in that: It also includes a partition, which is arranged between the support beam and the first battery, and the thermal conductivity of the partition is k1W / (mK), wherein k1≤0.46W / (mK).

12. The battery pack according to claim 11, characterized in that: 0.7≤y / z≤1.

1.

13. The battery pack according to claim 11, characterized in that: In the first direction, the partition plate extends upward beyond the upper end surface of the support beam, wherein 0.65≤y / z≤0.

95.

14. The battery pack according to claim 13, characterized in that: In the first direction, the partition extends upward beyond the upper end surface of the first battery, and 0.6≤y / z≤0.

68.

15. The battery pack according to claim 11, characterized in that: In the third direction, the thickness of the partition is T2 mm, wherein 5 mm ≤ T2 ≤ 13 mm.

16. The battery pack according to claim 11, characterized in that: A plurality of convex ribs are provided on a side of the partition plate facing the support beam, and the convex ribs are in contact with the support beam, and a plurality of second cavities are formed between the plurality of convex ribs, the partition plate and the support beam.

17. The battery pack according to claim 16, characterized in that: A fixing glue layer is provided in the second cavity, and the partition is fixed to the support beam through the fixing glue layer.

18. The battery pack according to claim 17, characterized in that: 16mm≤z≤17mm.

19. The battery pack according to claim 16, characterized in that: At least one of the convex ribs and the reinforcing ribs in the support beam are staggered, and the wall thickness of the support beam is T3mm, wherein T3≥2mm.

20. The battery pack according to claim 16, characterized in that: The multiple reinforcing ribs in the support beam and the multiple convex ribs on the partition are arranged one by one opposite to each other.

21. The battery pack according to claim 16, characterized in that: The first cavity and / or the second cavity is filled with a heat insulating medium.

22. The battery pack according to claim 11, characterized in that: A buffer is provided between the partition and the first battery.

23. The battery pack according to claim 22, characterized in that: In the third direction, the thickness of the buffer is T4 mm, wherein 1.5 mm≤T4≤4 mm.

24. The battery pack according to claim 1, characterized in that: A connecting adhesive layer is provided between the hoisting tube and the first battery, and the thermal conductivity of the connecting adhesive layer is k2W / (mK), wherein k2≤0.8W / (mK).

25. The battery pack according to claim 4, characterized in that: The largest side of the first battery faces the support beam, wherein 0.6≤y / z≤1.

1.

26. The battery pack according to claim 25, characterized in that: The first battery includes a box body and a battery cell. The battery cell is arranged in the box body. In a first direction, the height of the battery cell is h1 mm, and the height of the box body is h2 mm, wherein h1 / h2≤0.

98.

27. The battery pack according to claim 11, characterized in that: The lower end of the hanging tube extends toward the third direction to form a limiting portion, and the limiting portion exceeds the side of the support beam facing the first battery.

28. The battery pack according to claim 27, characterized in that: The limiting portion extends toward the third direction and exceeds a side surface of the partition that faces the first battery.

29. The battery pack according to claim 28, characterized in that: A projection of the limiting portion in the first direction partially overlaps with a projection of the first battery in the first direction.

30. The battery pack according to claim 27, characterized in that: In the third direction, the width of the limiting portion is w mm, and in the first direction, the height of the supporting beam is h3 mm, wherein 0.15≤w / h3≤0.

29.

31. The battery pack according to claim 27, characterized in that: A support plate is provided between the limiting portion and the first battery.

32. The battery pack according to claim 31, characterized in that: The support plate is a heat exchange plate, and the distance between the hoisting tube and the inner wall of the first cavity facing away from the first battery is d mm, wherein 7 mm ≤ d ≤ 9.5 mm.

33. The battery pack according to claim 4, characterized in that: The housing comprises a shell and a cover, the upper portion of the shell is provided with an opening, the shell comprises a bottom plate and a frame, the frame is arranged around the outer periphery of the bottom plate, the cover is arranged on the opening of the shell, and the bottom plate and the frame are enclosed to form the accommodating cavity; The hanging tube includes a first hanging tube and a second hanging tube sequentially arranged along a first direction, the first hanging tube is arranged between the support beam and the cover body, and the two ends of the first hanging tube are correspondingly connected to the opposite sides of the cover body and the support beam, the second hanging tube is passed through the support beam along the first direction, one end of the second hanging tube is connected to the bottom plate of the shell, and the other end of the second hanging tube is sealed and connected to the first hanging tube; In the first direction, the height of the second hanging tube is amm, and the height of the first hanging tube is bmm, wherein 40≤(a / b)*z≤77.

9.

34. The battery pack according to claim 4, characterized in that: The housing comprises a shell and a cover, the upper portion of the shell is provided with an opening, the shell comprises a bottom plate and a frame, the frame is arranged around the outer periphery of the bottom plate, the cover is arranged on the opening of the shell, and the bottom plate and the frame are enclosed to form the accommodating cavity; The hanging tube comprises a first hanging tube and a second hanging tube sequentially arranged along a first direction, one end of the first hanging tube is connected to the cover body, the other end of the first hanging tube extends into the support beam along the first direction, the second hanging tube is penetrated into the support beam along the first direction, one end of the second hanging tube is connected to the bottom plate of the shell, the other end of the second hanging tube is sleeved outside the end of the first hanging tube extending into the support beam, and the first hanging tube and the second hanging tube are threadedly connected; In the first direction, the height of the support beam is h3 mm, wherein 0.15≤z / h3≤0.

3.

35. The battery pack according to claim 33, characterized in that: The lifting tube also includes a third lifting tube, which is sleeved on the outer side of one end of the first lifting tube away from the second lifting tube, and the first lifting tube and the third lifting tube are threadedly connected. The end of the third lifting tube away from the first lifting tube is located outside the outer shell and abuts against the upper end surface of the cover body.

36. The battery pack according to claim 33, characterized in that: In the first direction, the second hanging tube passes upward through the side of the support beam facing the cover body, and the second hanging tube is sealed and connected to the first hanging tube; In the first direction, the height of the support beam is h3 mm, wherein 0.2≤a / h3≤0.

6.

37. The battery pack according to claim 33, characterized in that: The hanging tube also includes a third hanging tube, which is inserted into the interior of an end of the first hanging tube away from the second hanging tube, and the first hanging tube and the third hanging tube are threadedly connected.

38. The battery pack according to claim 27, characterized in that: The housing comprises a shell and a cover, the upper portion of the shell is provided with an opening, the shell comprises a bottom plate and a frame, the frame is arranged around the outer periphery of the bottom plate, the cover is arranged on the opening of the shell, and the bottom plate and the frame are enclosed to form the accommodating cavity; An explosion-proof valve is provided on the side of the first battery facing the bottom plate, and a weak portion is formed on the bottom plate at a position corresponding to the explosion-proof valve. The distance between the weak portion and the hoisting tube is cmm, wherein 240≤c*z≤760.

39. The battery pack according to claim 38, characterized in that: 15mm≤c≤40mm.

40. The battery pack according to claim 38, characterized in that: The distance between the weak portion and the limiting portion of the lifting tube is emm, wherein 5mm≤e≤20mm.

41. The battery pack according to claim 1, characterized in that: The weight of the battery pack body is gkg, where g>160kg and 0.6≤y / z≤1.5.

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