Protective support, battery pack and vehicle

Abstract

The utility model relates to a protective bracket, a battery pack and a vehicle. The protective support comprises a support body and at least two longitudinal beam assemblies arranged at intervals. And the frame body is configured to abut against the top surface and / or the bottom surface of the battery cell. The longitudinal beam assembly and the frame body are arranged at an angle. And the area between every two adjacent longitudinal beam assemblies is used for placing a battery cell. The longitudinal beam assembly is configured to abut against the side face of the battery cell. Wherein the frame body is configured to deform under the action of external force, so that each longitudinal beam assembly displaces and drives the battery cell corresponding to each longitudinal beam assembly to deform. Therefore, the deformation amount of one battery cell can be shared by a plurality of battery cells, so that the allowable invasion amount of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of protection, in particular to a protection support, a battery pack and a vehicle. BACKGROUND

[0002] With the rapid increase in the number of new energy vehicles, the protection of battery packs has attracted increasing attention. When the battery pack of a vehicle is subjected to a collision, the battery cells will deform, especially the outermost battery cells, which will have a large deformation and are prone to failure, thermal runaway and other phenomena, posing a safety hazard. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a protection support, a battery pack and a vehicle to improve the anti-collision capability of the battery pack and at least partially solve the above technical problems.

[0004] To achieve the above purpose, according to the first aspect of the present application, a protection support applied to a battery cell comprises:

[0005] a support body configured to abut against a top surface and / or a bottom surface of the battery cell;

[0006] at least two spaced longitudinal beam assemblies arranged at an angle to the support body, and a region between each adjacent two longitudinal beam assemblies is used to place the battery cell, wherein the longitudinal beam assemblies are configured to abut against a side surface of the battery cell;

[0007] wherein the support body is configured to deform under an external force to displace each longitudinal beam assembly and drive the corresponding battery cell of each longitudinal beam assembly to deform.

[0008] Optionally, the support body comprises a top support and a bottom support, the top support is configured to abut against the top surface of the battery cell, and the bottom support is configured to abut against the bottom surface of the battery cell, wherein at least two longitudinal beam assemblies are connected between the top support and the bottom support.

[0009] Optionally, the top support comprises:

[0010] at least two first beam bodies spaced apart in a first direction, each first beam body extends in a second direction, and each longitudinal beam assembly extends in a third direction, wherein each longitudinal beam assembly is connected to a first beam body;

[0011] a first reinforcing beam extending in the second direction, and the first reinforcing beam is connected to the at least two first beam bodies;

[0012] wherein any two of the first direction, the second direction and the third direction are arranged at an angle.

[0013] Optionally, the longitudinal beam assembly and the first beam body are spaced apart in a first direction to at least three, and define at least two mounting areas for placing the battery cell, wherein the at least two mounting areas divide the first reinforcing beam into at least two first reinforcing beam segments, and along the first direction, cross-sectional areas of the at least two first reinforcing beam segments satisfy a preset variation rule, so that deformation amounts of the first reinforcing beam segments are the same.

[0014] Optionally, the preset variation rule includes that along the first direction, the cross-sectional area of the first reinforcing beam segment located in the same mounting area decreases, and / or, along the first direction, the cross-sectional area of the first reinforcing beam segment located in different mounting areas decreases.

[0015] Optionally, along the first direction, the longitudinal beam assembly and the first beam body define three mounting areas, which are a first mounting area, a second mounting area and a third mounting area, wherein a cross-sectional area of a first reinforcing beam segment located in the first mounting area is S1, a cross-sectional area of a first reinforcing beam segment located in the second mounting area is S2, and a cross-sectional area of a first reinforcing beam segment located in the third mounting area is S3, and 1 / 2S1≤S2≤2 / 3S1 and 1 / 3S1≤S3≤1 / 2S1 are satisfied.

[0016] Optionally, the first reinforcing beam segments located in the second mounting area and the third mounting area are arranged in an arc-shaped structure and are curved in a plane corresponding to the first direction and the second direction.

[0017] Optionally, an arc rate of the arc-shaped first reinforcing beam segment is X1, and 5 degrees / cm≤X1≤25 degrees / cm is satisfied.

[0018] Optionally, an arc of the arc-shaped first reinforcing beam segment is Y1, and 5 degrees≤Y1≤25 degrees is satisfied.

[0019] Optionally, the at least two first reinforcing beam segments are integrally formed, or each first reinforcing beam segment is connected between two adjacent first beam bodies.

[0020] Optionally, the top frame further comprises:

[0021] A first extension support connected to the first beam body away from the external force, wherein a length of the first extension support is greater than or equal to a length of the first reinforcing beam segment.

[0022] Optionally, the bottom frame comprises:

[0023] at least two second beam bodies arranged in the first direction, each of the second beam bodies extending in a second direction, each of the longitudinal beam assemblies extending in a third direction, wherein each of the longitudinal beam assemblies is connected to one of the second beam bodies;

[0024] a second reinforcing beam extending in the second direction, the second reinforcing beam being connected to the at least two second beam bodies;

[0025] wherein any two of the first direction, the second direction and the third direction are arranged at an angle.

[0026] Optionally, the longitudinal beam assemblies and the second beam bodies are arranged in the first direction at intervals to be at least three, and define at least two mounting areas for placing the battery cells, wherein the at least two mounting areas divide the second reinforcing beam into at least two second reinforcing beam segments, cross-sectional areas of the at least two second reinforcing beam segments in the first direction satisfy a preset variation rule, so that deformation amounts of the second reinforcing beam segments are the same.

[0027] Optionally, the preset variation rule comprises: the cross-sectional area of the second reinforcing beam segment in the same mounting area in the first direction decreases; and / or, the cross-sectional area of the second reinforcing beam segment in different mounting areas in the first direction decreases.

[0028] Optionally, the longitudinal beam assemblies and the second beam bodies define three mounting areas in the first direction, which are a first mounting area, a second mounting area and a third mounting area, wherein a cross-sectional area of the second reinforcing beam segment in the first mounting area is S4, a cross-sectional area of the second reinforcing beam segment in the second mounting area is S5, and a cross-sectional area of the second reinforcing beam segment in the third mounting area is S6, which satisfy: 1 / 2S4≤S5≤2 / 3S4, 1 / 3S4≤S6≤1 / 2S4.

[0029] Optionally, the second reinforcing beam segments in the second mounting area and the third mounting area are arranged in an arc structure and are curved in a plane corresponding to the first direction and the second direction.

[0030] Optionally, an arc rate of the second reinforcing beam segment in the arc structure is X2, which satisfies: 5 degrees / cm≤X2≤25 degrees / cm.

[0031] Optionally, an arc of the second reinforcing beam segment in the arc structure is Y2, which satisfies: 5 degrees≤Y2≤25 degrees.

[0032] Optionally, the at least two second reinforcing beam segments are integrally formed, or each of the second reinforcing beam segments is connected between two adjacent second beam bodies.

[0033] Optionally, the chassis further comprises:

[0034] a second extension support connected with the second beam body away from the external force, wherein a length of the second extension support is greater than or equal to a length of the second reinforcing beam segment.

[0035] Optionally, the longitudinal beam assembly comprises at least two longitudinal beams arranged at intervals in the second direction, wherein a distance between two adjacent longitudinal beams is D, and 10mm≤D≤25mm is satisfied.

[0036] According to a second aspect of the present application, a battery pack is provided, comprising the protective support as described above.

[0037] According to a third aspect of the present application, a vehicle is further provided, comprising the battery pack as described above.

[0038] In the protective support, the battery pack and the vehicle of the embodiments of the present application, the electric cells are placed in the area between the two adjacent longitudinal beam assemblies, so that the electric cells can be located in the protective support. When the protective support is subjected to an external force, the frame body can be deformed, and each longitudinal beam assembly is displaced, and the position of the longitudinal beam assembly will cause the corresponding electric cells to be deformed. Thus, the deformation of one electric cell can be shared by multiple electric cells, thereby improving the allowable intrusion amount of the battery pack.

[0039] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0041] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0042] Figure 1 is one of the structural schematic diagrams of the protective support provided by the embodiments of the present application;

[0043] Figure 2 is the second structural schematic diagram of the protective support provided by the embodiments of the present application;

[0044] Figure 3 is Figure 2 the side view of the protective support provided by the embodiments of the present application;

[0045] Figure 4 isFigure 2 A top view of the protection bracket provided;

[0046] Figure 5 Figure 2 A bottom view of the protection bracket provided;

[0047] Figure 6 is one of the simulation structure diagrams of the protection bracket provided by the embodiments of the present application when the protection bracket is applied to the battery cell;

[0048] Figure 7 is another simulation structure diagram of the protection bracket provided by the embodiments of the present application when the protection bracket is applied to the battery cell;

[0049] Figure 8 is a front view of the deformation of the battery cell without the protection bracket in the related art;

[0050] Figure 9 is a structural schematic diagram of the deformation of the battery cell without the protection bracket in the related art;

[0051] Figure 10 is a curve diagram of the intrusion displacement and the energy absorption ratio of each battery cell in the battery pack without the protection bracket;

[0052] Figure 11 is a curve diagram of the intrusion displacement and the energy absorption ratio of each battery cell in the battery pack with the protection bracket;

[0053] Figure 12 is a deformation schematic diagram of each battery cell in the battery pack without the protection bracket;

[0054] Figure 13 is a deformation schematic diagram of each battery cell in the battery pack with the protection bracket.

[0055] Explanation of reference signs:

[0056] 1, bracket body; 11, top bracket; 111, first beam body; 112, first reinforcing beam; 1121, first reinforcing beam section; 113, first extension bracket; 12, bottom bracket; 121, second beam body; 122, second reinforcing beam; 1221, second reinforcing beam section; 123, second extension bracket; 13, first mounting area; 14, second mounting area; 15, third mounting area;

[0057] 2, longitudinal beam assembly. DETAILED DESCRIPTION

[0058] ​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the protection scope of the present application.

[0059] As shown in Figure 8 and Figure 9 In the related art, after the battery pack of the vehicle is subjected to a collision, although most of the impact force is absorbed by the battery pack shell, the residual part of the impact force still acts on the battery cell. This part of the residual impact force cannot be effectively transmitted inwardly / outwardly, which will cause the 1-2 outermost battery cells to be deformed seriously. As a result, the battery pack will be in thermal runaway and other phenomena. Once any one of the battery cells in the battery pack is in thermal runaway, the heat released by the battery cell will have extremely adverse effects on the battery pack, which may cause all the battery cells to be damaged due to the chain effect.

[0060] Please refer to Figures 1 to 13 The present application provides a protective support. The protective support comprises a support body 1 and at least two spaced longitudinal beam assemblies 2. The support body 1 is configured to abut the top surface and / or the bottom surface of the battery cell. The longitudinal beam assembly 2 is arranged at an angle with the support body 1. The area between each adjacent two longitudinal beam assemblies 2 is used to place the battery cell. The longitudinal beam assembly 2 is configured to abut the side surface of the battery cell. Wherein, the support body 1 is configured to deform under the action of external force, so as to displace each longitudinal beam assembly 2 and drive the corresponding battery cell of each longitudinal beam assembly 2 to deform.

[0061] In the embodiments of the present application, the battery cell is placed in the area between the adjacent two longitudinal beam assemblies 2, so that the battery cell can be located in the protective support. When the protective support is subjected to external force, the support body 1 can deform and displace each longitudinal beam assembly 2, and the position of the longitudinal beam assembly 2 will cause the corresponding battery cell to deform. Thus, the deformation amount of one battery cell can be distributed to multiple battery cells, thereby improving the allowable intrusion amount of the battery pack.

[0062] It can be understood that the protective support in the embodiments of the present application can act on multiple rows of battery cells. The outermost longitudinal beam assembly 2 or the outermost support body 1 is subjected to the impact of external force, and the external force is distributed to multiple rows of battery cells, so as to reduce the deformation amount of the outermost battery cell, thereby improving the allowable intrusion amount of the battery pack.

[0063] In some embodiments, the frame body 1 and the beam assembly 2 are both metal pieces and have sufficient impact resistance to ensure that the frame body 1 and the beam assembly 2 can drive the corresponding battery cells to deform together. For example, the frame body 1 and the beam assembly 2 are both made of steel or titanium alloy, so that the overall weight of the protection bracket is relatively light, and the impact resistance is sufficient. When the length of the protection bracket is 171 mm, the weight of the protection bracket is only 120 g, and the weight per unit length is only 0.7 g / mm. In the case of effectively relieving the deformation of the outermost battery cell, improving the allowable intrusion amount of the battery pack, and optimizing the crash safety performance of the battery pack, the weight of the battery pack is not significantly increased, which is beneficial to the lightweight design of the battery pack and the whole vehicle.

[0064] In some embodiments, the external force is usually a collision, scratching, etc. that occurs during vehicle operation.

[0065] In some embodiments, the external force can act directly on the frame body 1. At this time, the frame body 1 deforms and displaces each beam assembly 2, and the displacement of each beam assembly 2 drives the corresponding battery cell to deform, so that the deformation of one battery cell caused by the external force is shared by multiple battery cells. Thus, the energy absorbed by the outermost battery cell can be reduced, and the deformation degree of the outermost battery cell can be reduced.

[0066] In some embodiments, the external force can also act on the outermost beam assembly 2. At this time, the outermost beam assembly 2 deforms and transmits the force to the frame body 1. The deformation of the frame body 1 caused by the force can make the remaining beam assemblies 2 displace, and the displacement of the remaining beam assemblies 2 drives the corresponding battery cells to deform, so that the deformation of one battery cell caused by the external force is shared by multiple battery cells. Thus, the energy absorbed by the outermost battery cell can be reduced, and the deformation degree of the outermost battery cell can be reduced.

[0067] In some embodiments, the frame body 1 can only abut the top of the battery cell. When the frame body 1 or the beam assembly 2 is subjected to an external force, the frame body 1 deforms and displaces each beam assembly 2. Each beam assembly 2 is displaced after being subjected to the force from above, and drives the corresponding battery cell to deform, so that the external force is shared by multiple battery cells, the energy absorbed by the outermost battery cell is reduced, and the deformation degree of the outermost battery cell is reduced.

[0068] In some embodiments, the frame body 1 can only abut the bottom of the battery cell. When the frame body 1 or the beam assembly 2 is subjected to an external force, the frame body 1 deforms and displaces each beam assembly 2. Each beam assembly 2 is displaced after being subjected to the force from below, and drives the corresponding battery cell to deform, so that the external force is shared by multiple battery cells, the energy absorbed by the outermost battery cell is reduced, and the deformation degree of the outermost battery cell is reduced.

[0069] In some embodiments, the frame body 1 can abut the top and bottom of the battery cell at the same time.

[0070] In some embodiments, the longitudinal beam assembly 2 abuts against the side surface of the battery cell. The side surface particularly refers to the large surface of the battery cell.

[0071] In some embodiments, the longitudinal beam assembly 2 is perpendicular to the frame 1. Alternatively, the longitudinal beam assembly 2 can be arranged at an acute angle with the frame 1. Alternatively, the longitudinal beam assembly 2 can be arranged at an obtuse angle with the frame 1. The angle between the longitudinal beam assembly 2 and the frame 1 can be reasonably selected based on the shape of the battery pack, the shape of the battery cell, and the distribution of the battery cells.

[0072] In some embodiments, the area for placing the battery cell formed by the adjacent two longitudinal beam assemblies 2 and the frame 1 is generally square. The protection bracket in the embodiments of the present application is particularly suitable for square battery cells and pouch battery cells.

[0073] In some embodiments, at least two longitudinal beam assemblies 2 are arranged at intervals along a first direction. Each longitudinal beam assembly 2 extends along a third direction. The first direction can be the width direction of the battery pack, the third direction can be the height direction of the battery pack, and the second direction described below can be the length direction of the battery pack. In this way, the first direction, the second direction and the third direction are perpendicular to each other.

[0074] In some embodiments, the frame 1 includes a top frame 11 and a bottom frame 12. The top frame 11 is configured to abut against the top surface of the battery cell. The bottom frame 12 is configured to abut against the bottom surface of the battery cell. At least two longitudinal beam assemblies 2 are connected between the top frame 11 and the bottom frame 12.

[0075] It can be understood that the top frame 11 and the bottom frame 12 abut against the top surface and the bottom surface of the battery cell respectively. In this way, a plurality of areas for placing the battery cell can be formed by the top frame 11, the bottom frame 12 and the at least two longitudinal beam assemblies 2. By connecting the at least two longitudinal beam assemblies 2 between the top frame 11 and the bottom frame 12, the space for placing the battery cell is limited by the top frame 11, the bottom frame 12 and the longitudinal beam assemblies 2. Therefore, the battery cell only needs to be inserted into each mounting area, without the need for using rigid or flexible connecting structures to fix the battery cell, so that the battery cell is fixed conveniently and quickly.

[0076] In some embodiments, when the outer side of the top frame 11 is subjected to an external force, the top frame 11 deforms and causes each longitudinal beam assembly 2 to displace, so that the corresponding battery cell deforms. When the external force is large, each longitudinal beam assembly 2 can also cause the underlying bottom frame 12 to deform.

[0077] In some embodiments, when the outer side of the bottom frame 12 is subjected to an external force, the bottom frame 12 deforms and causes each longitudinal beam assembly 2 to displace, so that the corresponding battery cell deforms. When the external force is large, each longitudinal beam assembly 2 can also cause the upper top frame 11 to deform.

[0078] In some embodiments, when the outermost longitudinal beam assembly 2 is subjected to an external force, the longitudinal beam assembly 2 deforms and displaces. The displacement of the longitudinal beam assembly 2 can cause the top frame 11 and the bottom frame 12 to deform, and the remaining longitudinal beam assemblies 2 to displace, so as to cause the corresponding battery cells to deform.

[0079] In some embodiments, the top frame 11 and the bottom frame 12 can be arranged in a manner that the longitudinal beam assemblies 2 are arranged along the height direction. In this way, all the forces of the top frame 11, the bottom frame 12, and the longitudinal beam assemblies 2 can be transmitted in the longitudinal direction, so that the deformation amount is also evenly distributed in the height direction of the battery cells, and the stress is not too concentrated to cause a large deformation amount at a position in the height direction.

[0080] In some embodiments, the top frame 11 and the bottom frame 12 can have the same structure. Alternatively, the top frame 11 and the bottom frame 12 can have different structures.

[0081] In some embodiments, the top frame 11, the bottom frame 12, and the longitudinal beam assemblies 2 are integrally formed. For example, the top frame 11, the bottom frame 12, and the longitudinal beam assemblies 2 are manufactured by using an additive manufacturing process. Based on the additive manufacturing process, the protective support in the present application can be processed in three dimensions layer by layer, which can be extremely convenient. At the same time, since the processing process is integrated and continuous, no additional connection process is required. For example, after processing, the top frame 11, the bottom frame 12, and the longitudinal beam assemblies 2 do not need to be connected by bolts, rivets, or the like.

[0082] Based on the use of the additive manufacturing process to process the protective support, the protective support is suitable for mass production, and the production cost is relatively low. It should be noted that after the protective support is processed by the additive manufacturing process, the surface can be polished to prevent the presence of burrs or unfused metal particles on the surface of the protective support, which can cause puncture damage to the surface of the battery cell.

[0083] In some embodiments, the distance between the two adjacent longitudinal beam assemblies 2 can be reasonably selected according to the width of the battery cell.

[0084] In some embodiments, the top frame 11 includes a first reinforcing beam 112 and at least two first beam bodies 111 arranged at intervals in a first direction. Each longitudinal beam assembly 2 extends in a third direction. Each longitudinal beam assembly 2 is connected to a first beam body 111. The first reinforcing beam 112 extends in a second direction, and the first reinforcing beam 112 is connected to the at least two first beam bodies 111. Any two of the first direction, the second direction, and the third direction are arranged at an angle.

[0085] It can be understood that the first beam body 111 is used to connect the longitudinal beam assembly 2, and one first beam body 111 corresponds to one set of longitudinal beam assemblies 2. Thus, the force acting on the longitudinal beam assembly 2 can be transmitted to the first beam body 111, or the force acting on the first beam body 111 can be transmitted to the longitudinal beam assembly 2. The first reinforcing beam 112 can transmit the force between two adjacent first beam bodies 111. Thus, the force acting on the outer first beam body 111 can be transmitted to the inner first beam body 111 and the longitudinal beam assembly 2, so as to distribute the deformation amount of one battery cell to multiple battery cells, thereby reducing the deformation amount of the outermost battery cell.

[0086] In some embodiments, the first direction, the second direction and the third direction are perpendicular to each other. Alternatively, any two of the first direction, the second direction and the third direction are arranged at an acute angle. Alternatively, any two of the first direction, the second direction and the third direction are arranged at an obtuse angle.

[0087] In some embodiments, the first direction is the width direction of the battery pack, the second direction is the length direction of the battery pack, and the third direction is the height direction of the battery pack.

[0088] In some embodiments, the longitudinal beam assembly 2 and the first beam body 111 are spaced apart in the first direction to be at least three, and at least two mounting areas for placing battery cells are defined. The at least two mounting areas divide the first reinforcing beam 112 into at least two first reinforcing beam segments 1121. Along the first direction, the cross-sectional areas of the at least two first reinforcing beam segments 1121 satisfy a preset variation rule, so that the deformation amounts of the first reinforcing beam segments 1121 are the same.

[0089] It can be understood that after the external force acts on the outermost longitudinal beam assembly 2 or the outermost top frame 11, the force will be gradually transmitted inward along the first direction. Based on the attenuation of the force, the force acting on the first reinforcing beam segment 1121 located at the rear of the force transmission path will decrease. In the embodiment, the cross-sectional areas of the first reinforcing beam segments 1121 in each mounting area satisfy the preset variation rule along the first direction, so that the deformation degrees of the first reinforcing beams 112 in each mounting area are basically the same, thereby making the deformation amounts of the battery cells in each mounting area basically consistent, and ensuring that each battery cell is uniformly deformed.

[0090] When the force acts on the outermost longitudinal beam assembly 2, part of the force will deform the outermost longitudinal beam assembly 2 and drive the deformation of the outermost battery cell, and the other part of the force will be transmitted along the first direction and through each first reinforcing beam segment 1121. As the force is transmitted and continuously acts on the longitudinal beam assembly 2 and the battery cell, the force acting on the inner longitudinal beam assembly 2 will be smaller. Based on the fact that the cross-sectional area of the first reinforcing beam segment 1121 meets the preset variation rule, the displacement of the inner first reinforcing beam 112 in the first direction can be made substantially the same as the displacement of the outermost first reinforcing beam 112 in the first direction, thereby ensuring that each battery cell deforms uniformly.

[0091] In some embodiments, the preset variation rule includes that, along the first direction, the cross-sectional area of the first reinforcing beam segment 1121 located in the same installation region decreases. And / or, along the first direction, the cross-sectional area of the first reinforcing beam segment 1121 located in different installation regions decreases.

[0092] For example, along the first direction, the cross-sectional area of the first reinforcing beam segment 1121 located in the same installation region decreases, and the cross-sectional area of the first reinforcing beam segment 1121 located in different installation regions also decreases, so that the displacement of the first reinforcing beam segment 1121 at the rear end of the force transmission path is substantially the same as the displacement of the first reinforcing beam segment 1121 at the front end of the force transmission path, to ensure that each battery cell deforms uniformly.

[0093] For example, along the first direction, the cross-sectional area of the first reinforcing beam segment 1121 located in the same installation region is the same, and the cross-sectional area of the first reinforcing beam segment 1121 located in different installation regions decreases, so that the displacement of the first reinforcing beam segment 1121 at the rear end of the force transmission path is substantially the same as the displacement of the first reinforcing beam segment 1121 at the front end of the force transmission path, to ensure that each battery cell deforms uniformly.

[0094] In some embodiments, the number of longitudinal beam assemblies 2 can be selected according to the number of battery cells to be protected and / or the number of battery cells to share the force. For example, when the 1-4 battery cells on the outermost side need to be protected, the number of longitudinal beam assemblies 2 can be set to four, and three installation regions are formed. In the direction from the outside to the inside, they are the 1st battery cell, the 2nd battery cell, the 3rd battery cell and the 4th battery cell. Among them, the 4th battery cell is in abutment with the innermost longitudinal beam assembly 2. When the outermost longitudinal beam assembly 2 is subjected to a collision, under the action of the external force, the longitudinal beam assembly 2 and the first beam body 111 deform and displace, and each longitudinal beam assembly 2 can drive the 1-4 battery cells to deform, thereby transmitting the entire impact load of the 1st battery cell to the 2nd battery cell, the 3rd battery cell and the 4th battery cell inside, and driving the 2nd battery cell, the 3rd battery cell and the 4th battery cell to deform. Thus, the allowable deformation amount of the battery cell and the battery pack can be greatly improved. Based on the cross-sectional area design of the first beam body 111, the deformation of the 1-4 battery cells can be ensured to be substantially uniform.

[0095] In some embodiments, the first beam body 111 can be a hollow beam or a solid beam. The thickness of the first beam body 111 is greater than or equal to 1 mm, so that the longitudinal beam assembly 2 has sufficient impact stiffness to ensure that the longitudinal beam assembly 2 can drive the respective corresponding battery cell to deform.

[0096] In some embodiments, in the first direction, the longitudinal beam assembly 2 and the first beam body 111 define three mounting regions, which are the first mounting region 13, the second mounting region 14, and the third mounting region 15. Among them, the cross-sectional area of the first reinforcing beam segment 1121 located in the first mounting region 13 is S1, the cross-sectional area of the first reinforcing beam segment 1121 located in the second mounting region 14 is S2, and the cross-sectional area of the first reinforcing beam segment 1121 located in the third mounting region 15 is S3, which satisfies: 1 / 2S1≤S2≤2 / 3S1, 1 / 3S1≤S3≤1 / 2S1.

[0097] It can be understood that based on defining three mounting regions, the longitudinal beam assembly 2 is provided with four. Based on the cross-sectional area of the first reinforcing beam segment 1121 corresponding to each mounting region satisfying the above relationship, the mechanical properties of each first reinforcing beam segment 1121 have a gradient change from the outside to the inside. When the force is transmitted from the outside to the inside, although the force will attenuate, it can ensure that the deformation degree of each first reinforcing beam segment 1121 is basically the same, so that the displacement degree of each longitudinal beam assembly 2 is basically the same. Therefore, when the longitudinal beam assembly 2 drives the corresponding battery cell to deform, the deformation of each battery cell can be more uniform.

[0098] Among them, in order to ensure that from the outside to the inside, the mechanical properties of each first reinforcing beam segment 1121 have a gradient change, when S2=1 / 2S1, S3<1 / 2S1; when S3=1 / 2S1, S2>1 / 2S1. For example, S2=2 / 3S1, S3=1 / 2S1; or S2=1 / 2S1, S3=1 / 3S1.

[0099] In some embodiments, the first mounting region 13, the second mounting region 14, and the third mounting region 15 are the same size.

[0100] In some embodiments, the first reinforcing beam segment 1121 is configured as a square beam. Configuring the first reinforcing beam segment 1121 as a square facilitates the fabrication of the protective bracket using additive manufacturing processes. Furthermore, when the first reinforcing beam segment 1121 deforms, the stress on its cross-section is relatively uniform in all directions, preventing upward or downward warping. In other words, the first reinforcing beam segment 1121 is less prone to deformation in any third direction. This avoids deformation of the top or bottom surface of the battery cell caused by deformation of the first reinforcing beam segment 1121, or damage to the battery pack's heat dissipation system caused by deformation of the first reinforcing beam segment 1121.

[0101] The side length of the first reinforcing beam segment 1121 located in the first installation area 13 is a1, which satisfies: a1≥1 mm, thereby ensuring that the first reinforcing beam segment 1121 has sufficient strength.

[0102] Among them, a number of first beams 111 and a number of first reinforcing beams 112 can form a grid-shaped top frame 11.

[0103] In some embodiments, each longitudinal beam assembly 2 includes a plurality of longitudinal beams. The longitudinal beams correspond to the positions of the first reinforcing beam segment 1121.

[0104] In some embodiments, the cross-section of the first reinforcing beam segment 1121 can be set as a triangle, rhombus, trapezoid, circle, ellipse, etc., so that the first reinforcing beam segment 1121 can transmit the force and prevent the first reinforcing beam segment 1121 from warping upwards / downwards during deformation.

[0105] In some embodiments, the first reinforcing beam segment 1121 located in the second mounting area 14 and the third mounting area 15 is configured as an arc-shaped structure and is bent in the plane corresponding to the first direction and the second direction.

[0106] Understandably, due to the gradual attenuation of the force, the first reinforcing beam segment 1121 in the first installation area 13 experiences the greatest force, while the force on the first reinforcing beam segment 1121 in the second installation area 14 and the third installation area 15 decreases sequentially. By setting the first reinforcing beam segment 1121 in the second installation area 14 and the third installation area 15 as an arc-shaped structure, the first reinforcing beam segment 1121 in the second installation area 14 and the third installation area 15 can deform under a smaller force. This further ensures that the deformation degree of each first reinforcing beam segment 1121 is basically the same, making the deformation amount of each battery cell basically the same. This achieves the uniform distribution of the force from one battery cell to multiple battery cells, and the uniform deformation of multiple battery cells, optimizing the deformation space of the battery cells.

[0107] The arc-shaped structure is curved in the planes corresponding to the first direction and the second direction, which can deform the first reinforcing beam segment 1121 in the planes corresponding to the first direction and the second direction. Thus, the first reinforcing beam segment 1121 is further prevented from being upwardly or downwardly warped, and the deformation of the first reinforcing beam segment 1121 is avoided from deforming the top surface or the bottom surface of the battery cell or damaging the heat dissipation system of the battery pack.

[0108] In some embodiments, the first reinforcing beam segment 1121 in the arc shape has an arc change rate X1, which satisfies: 5 degrees / centimeter ≤ X1 ≤ 25 degrees / centimeter.

[0109] It can be understood that the arc change rate of the first reinforcing beam segment 1121 is controlled in the range of 5 degrees / centimeter to 25 degrees / centimeter to ensure that the arc change rate of the first reinforcing beam segment 1121 is in the preset range, so that the deformation amount of the first reinforcing beam segment 1121 located in the second mounting area 14 and the third mounting area 15 is the same as that of the first reinforcing beam segment 1121 located in the first mounting area 13.

[0110] For example, the arc change rate of the first reinforcing beam segment 1121 located in the second mounting area can be set to 5 degrees / centimeter, 10 degrees / centimeter, 15 degrees / centimeter, 20 degrees / centimeter, 25 degrees / centimeter, or any value between any two of them. The arc change rate of the first reinforcing beam segment 1121 located in the third mounting area can be set to 5 degrees / centimeter, 10 degrees / centimeter, 15 degrees / centimeter, 20 degrees / centimeter, 25 degrees / centimeter, or any value between any two of them. The arc change rate of the first reinforcing beam segment 1121 located in the second mounting area can be the same as that of the first reinforcing beam segment 1121 located in the third mounting area. Alternatively, the arc change rate of the first reinforcing beam segment 1121 located in the second mounting area is less than that of the first reinforcing beam segment 1121 located in the third mounting area. Alternatively, the arc change rate of the first reinforcing beam segment 1121 located in the second mounting area is greater than that of the first reinforcing beam segment 1121 located in the third mounting area.

[0111] In some embodiments, the first reinforcing beam segment 1121 in the arc shape has an arc Y1, which satisfies: 5 degrees ≤ Y1 ≤ 25 degrees.

[0112] It can be understood that the arc of the first reinforcing beam segment 1121 is controlled in the range of 5 degrees to 25 degrees to ensure that the arc of the first reinforcing beam segment 1121 is in the preset range, so that the deformation amount of the first reinforcing beam segment 1121 located in the second mounting area 14 and the third mounting area 15 is the same as that of the first reinforcing beam segment 1121 located in the first mounting area 13.

[0113] For example, the curvature of the first reinforcing beam segment 1121 located in the second installation area can be set to 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, or any value between any two. The curvature of the first reinforcing beam segment 1121 located in the third installation area can be set to 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, or any value between any two. The curvature of the first reinforcing beam segment 1121 located in the second installation area can be the same as that of the first reinforcing beam segment 1121 located in the third installation area. Alternatively, the curvature of the first reinforcing beam segment 1121 located in the second installation area can be less than that of the first reinforcing beam segment 1121 located in the third installation area. Alternatively, the curvature of the first reinforcing beam segment 1121 located in the second installation area can be greater than that of the first reinforcing beam segment 1121 located in the third installation area.

[0114] In some embodiments, at least two first reinforcing beam segments 1121 are integrally formed. Alternatively, each first reinforcing beam segment 1121 is connected between two adjacent first beam bodies 111. Thus, the first reinforcing beam 112 can be an integral beam structure or a split beam structure.

[0115] In some embodiments, the top frame 11 further includes a first extension bracket 113. The first extension bracket 113 is connected to a first beam 111 that is away from the action of external forces. The length of the first extension bracket 113 is greater than or equal to the length of the first reinforcing beam segment 1121.

[0116] Understandably, the first extension bracket 113 can improve the stability of the protective bracket to prevent deformation and instability at the upper end of the protective bracket when it is subjected to a collision.

[0117] The length of the first extension bracket 113 is greater than or equal to the length of the first reinforcing beam segment 1121, so that the first extension bracket 113 covers at least the width direction of one battery cell, thereby ensuring a stable effect.

[0118] For example, the length of the first extension bracket 113 is three times the length of the first reinforcing beam segment 1121, so that the first extension bracket 113 can cover the top surface of cell No. 4, cell No. 5 and cell No. 6.

[0119] Wherein, the length of the first extension bracket 113 refers to the distance the first extension bracket 113 extends in the first direction. The length of the first reinforcing beam segment 1121 refers to the distance the first reinforcing beam segment 1121 extends in the first direction.

[0120] In some embodiments, the chassis 12 comprises a second reinforcing beam 122 and at least two second beam bodies 121 spaced apart along a first direction. Each second beam body 121 extends along a second direction. Each longitudinal beam assembly 2 extends along a third direction. Each longitudinal beam assembly 2 is connected to a second beam body 121 respectively. The second reinforcing beam 122 extends along the second direction. The second reinforcing beam 122 is connected to the at least two second beam bodies 121. There is a second reinforcing beam 122 corresponding to each adjacent two second beam bodies 121. Any two of the first direction, the second direction and the third direction are arranged at an angle.

[0121] It can be understood that the second beam body 121 is used to connect the longitudinal beam assembly 2, and one second beam body 121 corresponds to one group of longitudinal beam assemblies 2. Thus, the force received by the longitudinal beam assembly 2 can be transmitted to the second beam body 121, or the force received by the second beam body 121 can be transmitted to the longitudinal beam assembly 2. The second reinforcing beam 122 can transmit the force between the adjacent two second beam bodies 121. Thus, the force received by the outer second beam body 121 can be transmitted to the inner second beam body 121 and the longitudinal beam assembly 2, so as to distribute the deformation amount of one battery cell to multiple battery cells, thereby reducing the deformation amount of the outermost battery cell.

[0122] In some embodiments, the first direction, the second direction and the third direction are perpendicular to each other. Alternatively, any two of the first direction, the second direction and the third direction are arranged at an acute angle. Alternatively, any two of the first direction, the second direction and the third direction are arranged at an obtuse angle.

[0123] In some embodiments, the first direction is the width direction of the battery pack, the second direction is the length direction of the battery pack, and the third direction is the height direction of the battery pack.

[0124] In some embodiments, the longitudinal beam assemblies 2 and the second beam bodies 121 are spaced apart along the first direction to at least three, and at least two mounting areas for placing battery cells are defined. The at least two mounting areas divide the second reinforcing beam 122 into at least two second reinforcing beam segments 1221. Along the first direction, the cross-sectional areas of the at least two second reinforcing beam segments 1221 satisfy a preset variation rule, so that the deformation amounts of the second reinforcing beam segments 1221 are the same.

[0125] It can be understood that, after the external force acts on the outermost longitudinal beam assembly 2 and the outermost chassis 12, the force will be gradually transmitted inward along the first direction, and the force on the second reinforcing beam segment 1221 located at the rear of the force transmission path will decrease based on the attenuation of the force. In the embodiment, the cross-sectional area of the second reinforcing beam segment 1221 in each mounting area is changed along the first direction to meet the preset change rule, so that the deformation degree of the second reinforcing beam segment 1221 in each mounting area is substantially the same, thereby making the deformation amount of the battery cell in each mounting area substantially consistent, and ensuring that each battery cell is uniformly deformed.

[0126] When the external force acts on the outermost longitudinal beam assembly 2, part of the force will deform the outermost longitudinal beam assembly 2 and drive the deformation of the outermost battery cell, and the other part of the force will be transmitted along the first direction and through each second reinforcing beam segment 1221. With the transmission of force and the continuous action on the longitudinal beam assembly 2 and the battery cell, the force on the inner longitudinal beam assembly 2 will be smaller. Based on the cross-sectional area of the second reinforcing beam segment 1221 meeting the preset change rule, the displacement of the second reinforcing beam segment 1221 on the inner side in the first direction is substantially the same as the displacement of the second reinforcing beam segment 1221 on the outermost side in the first direction, thereby ensuring that each battery cell is uniformly deformed.

[0127] In some embodiments, the preset change rule includes that, along the first direction, the cross-sectional area of the second reinforcing beam segment 1221 located in the same mounting area decreases. And / or, along the first direction, the cross-sectional area of the second reinforcing beam segment 1221 located in different mounting areas decreases.

[0128] For example, along the first direction, the cross-sectional area of the second reinforcing beam segment 1221 located in the same mounting area decreases, and the cross-sectional area of the second reinforcing beam segment 1221 located in different mounting areas also decreases, so that the displacement of the second reinforcing beam segment 1221 at the rear end of the force transmission path is substantially the same as the displacement of the second reinforcing beam segment 1221 at the front end of the force transmission path, to ensure that each battery cell is uniformly deformed.

[0129] For example, along the first direction, the cross-sectional area of the second reinforcing beam segment 1221 located in the same mounting area is the same, and the cross-sectional area of the second reinforcing beam segment 1221 located in different mounting areas decreases, so that the displacement of the second reinforcing beam segment 1221 at the rear end of the force transmission path is substantially the same as the displacement of the second reinforcing beam segment 1221 at the front end of the force transmission path, to ensure that each battery cell is uniformly deformed.

[0130] In some embodiments, the number of the longitudinal beam assemblies 2 can be selected according to the number of the battery cells to be protected, and / or the number of the battery cells to be shared by the acting force. For example, when the outermost battery cells No. 1-4 need to be protected, the number of the longitudinal beam assemblies 2 can be set to four, and three mounting areas are formed. In the direction from the outside to the inside, they are the battery cell No. 1, the battery cell No. 2, the battery cell No. 3, and the battery cell No. 4. Among them, the battery cell No. 4 is in abutment with the innermost longitudinal beam assembly 2. When the outermost longitudinal beam assembly 2 is subjected to a collision, under the action of the external force, the longitudinal beam assembly 2 and the second beam body 121 are deformed and displaced, so that each longitudinal beam assembly 2 drives the battery cells No. 1-4 to deform, thereby transferring the entire impact load of the battery cell No. 1 to the inside to the battery cells No. 2, 3 and 4, and driving the battery cells No. 2, 3 and 4 to deform. Thus, the allowable deformation amount of the battery cells and the battery pack can be greatly improved. Based on the cross-sectional area design of the second beam body 121, it can be ensured that the deformations of the battery cells No. 1-4 are substantially uniform.

[0131] In some embodiments, the second beam body 121 can be a hollow beam or a solid beam. The thickness of the second beam body 121 is greater than or equal to 1 mm, so that the longitudinal beam assembly 2 has sufficient impact stiffness to ensure that the longitudinal beam assembly 2 can drive the corresponding battery cells to deform.

[0132] In some embodiments, in the first direction, the longitudinal beam assembly 2 and the second beam body 121 define three mounting areas, which are the first mounting area 13, the second mounting area 14, and the third mounting area 15. Among them, the cross-sectional area of the second reinforcing beam segment 1221 located in the first mounting area 13 is S4, the cross-sectional area of the second reinforcing beam segment 1221 located in the second mounting area 14 is S5, and the cross-sectional area of the second reinforcing beam segment 1221 located in the third mounting area 15 is S6, which satisfies: 1 / 2S4≤S5≤2 / 3S4, 1 / 3S4≤S6≤1 / 2S4.

[0133] It can be understood that based on the three mounting areas being defined, the longitudinal beam assembly 2 is provided as four. Based on the cross-sectional area of the second reinforcing beam segment 1221 corresponding to each mounting area satisfying the above relationship, in the direction from the outside to the inside, the mechanical properties of each second reinforcing beam segment 1221 can have a gradient change. When the acting force is transmitted in the direction from the outside to the inside, although the acting force can be attenuated, it can be ensured that the deformation degrees of each second reinforcing beam segment 1221 are substantially the same, so that the displacement degrees of each longitudinal beam assembly 2 are substantially the same. Thus, when the longitudinal beam assembly 2 drives the corresponding battery cells to deform, the deformations of the battery cells can be more uniform.

[0134] To ensure that the mechanical properties of each second reinforcing beam segment 1221 vary in a gradient from the outside to the inside, when S5 = 1 / 2S4, S6 < 1 / 2S4; when S6 = 1 / 2S4, S5 > 1 / 2S4. For example, S5 = 2 / 3S4, S6 = 1 / 2S4; or S5 = 1 / 2S4, S6 = 1 / 3S4.

[0135] In some embodiments, the first mounting area 13, the second mounting area 14, and the third mounting area 15 are the same size.

[0136] In some embodiments, the second reinforcing beam segment 1221 is configured as a square beam. Configuring the second reinforcing beam segment 1221 as a square facilitates the fabrication of the protective bracket using additive manufacturing processes. Furthermore, when the second reinforcing beam segment 1221 deforms, the stress on its cross-section is relatively uniform in all directions, preventing upward or downward warping. In other words, the second reinforcing beam segment 1221 is less prone to deformation in any third direction. This avoids deformation of the top or bottom surface of the battery cell caused by deformation of the second reinforcing beam segment 1221, or damage to the battery pack's heat dissipation system caused by deformation of the second reinforcing beam segment 1221.

[0137] The second reinforcing beam segment 1221 located in the first installation area 13 has a side length of a2, which satisfies that a2≥1 mm, thereby ensuring that the second reinforcing beam segment 1221 has sufficient strength.

[0138] In some embodiments, the second direction is perpendicular to the first direction. For example, the first direction is the width direction of the battery pack, and the second direction is the length direction of the battery pack. Alternatively, the second direction may be set at an acute angle or an obtuse angle to the first direction.

[0139] Among them, a number of second beams 121 and a number of second reinforcing beams 122 can form a grid-shaped base frame 12.

[0140] In some embodiments, each longitudinal beam assembly 2 includes a plurality of longitudinal beams. The longitudinal beams correspond to the positions of the second reinforcing beam segment 1221.

[0141] In some embodiments, the cross-section of the second reinforcing beam segment 1221 can be set as a triangle, rhombus, trapezoid, circle, ellipse, etc., so that the second reinforcing beam segment 1221 can transmit the force and prevent the second reinforcing beam segment 1221 from warping upwards / downwards during deformation.

[0142] In some embodiments, the second reinforcing beam segment 1221 located in the second mounting region 14 and the third mounting region 15 is configured as an arc-shaped structure and is bent in the plane corresponding to the first direction and the second direction.

[0143] It can be understood that, due to the gradual attenuation of the force, the force borne by the corresponding second reinforcing beam segment 1221 in the first mounting area 13 is the largest, and the forces borne by the second reinforcing beam segments 1221 in the second mounting area 14 and the third mounting area 15 decrease in turn. By arranging the second reinforcing beam segments 1221 in the second mounting area 14 and the third mounting area 15 as arc-shaped structures, the second reinforcing beam segments 1221 in the second mounting area 14 and the third mounting area 15 can be deformed under smaller forces, thereby further ensuring that the deformation degree of each second reinforcing beam segment 1221 is substantially the same, making the deformation amount of each battery cell substantially the same, achieving uniform distribution of the force of one battery cell to multiple battery cells, and making the multiple battery cells deform uniformly, and optimizing the deformation space of the battery cells.

[0144] The arc-shaped structure is curved in the planes corresponding to the first direction and the second direction, which can make the second reinforcing beam segment 1221 deform in the planes corresponding to the first direction and the second direction. Thus, the second reinforcing beam segment 1221 is further prevented from being upwardly or downwardly warped, avoiding the deformation of the second reinforcing beam segment 1221 causing the deformation of the top surface or the bottom surface of the battery cell, or avoiding the deformation of the second reinforcing beam segment 1221 causing damage to the heat dissipation system of the battery pack.

[0145] In some embodiments, the second reinforcing beam segment 1221 arranged as an arc has an arc rate X2, which satisfies: 5 degrees / cm ≤ X2 ≤ 25 degrees / cm.

[0146] It can be understood that, based on controlling the arc rate of the second reinforcing beam segment 1221 within the range of 5 degrees / cm to 25 degrees / cm, the arc rate of the second reinforcing beam segment 1221 is ensured to be within the preset range, so that the deformation amount of the second reinforcing beam segment 1221 in the second mounting area 14 and the third mounting area 15 is the same as that of the second reinforcing beam segment 1221 in the first mounting area 13.

[0147] For example, the rate of change of the curvature of the second reinforcing beam segment 1221 located in the second installation area can be set to 5 degrees per centimeter, 10 degrees per centimeter, 15 degrees per centimeter, 20 degrees per centimeter, 25 degrees per centimeter, or any value between any two of them. The rate of change of the curvature of the second reinforcing beam segment 1221 located in the third installation area can be set to 5 degrees per centimeter, 10 degrees per centimeter, 15 degrees per centimeter, 20 degrees per centimeter, 25 degrees per centimeter, or any value between any two of them. Among them, the rate of change of the curvature of the second reinforcing beam segment 1221 located in the second installation area can be the same as the rate of change of the curvature of the second reinforcing beam segment 1221 located in the third installation area. Or, the rate of change of the curvature of the second reinforcing beam segment 1221 located in the second installation area is less than the rate of change of the curvature of the second reinforcing beam segment 1221 located in the third installation area. Or, the rate of change of the curvature of the second reinforcing beam segment 1221 located in the second installation area is greater than the rate of change of the curvature of the second reinforcing beam segment 1221 located in the third installation area.

[0148] In some embodiments, the curvature of the arc-shaped second reinforcing beam segment 1221 is Y2, which satisfies: 5 degrees ≤ Y2 ≤ 25 degrees.

[0149] It can be understood that, based on controlling the curvature of the second reinforcing beam segment 1221 within the range of 5 degrees to 25 degrees, it is ensured that the curvature of the second reinforcing beam segment 1221 is within the preset range, so that the deformation amount of the second reinforcing beam segment 1221 located in the second installation area 14 and the third installation area 15 is the same as the deformation amount of the second reinforcing beam segment 1221 located in the first installation area 13.

[0150] For example, the curvature of the second reinforcing beam segment 1221 located in the second installation area can be set to 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, or any value between any two of them. The curvature of the second reinforcing beam segment 1221 located in the third installation area can be set to 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, or any value between any two of them. Among them, the curvature of the second reinforcing beam segment 1221 located in the second installation area can be the same as the curvature of the second reinforcing beam segment 1221 located in the third installation area. Or, the curvature of the second reinforcing beam segment 1221 located in the second installation area is less than the curvature of the second reinforcing beam segment 1221 located in the third installation area. Or, the curvature of the second reinforcing beam segment 1221 located in the second installation area is greater than the curvature of the second reinforcing beam segment 1221 located in the third installation area.

[0151] In some embodiments, at least two second reinforcing beam segments 1221 are integrally formed. Or, each second reinforcing beam segment 1221 is connected between two adjacent second beam bodies 121, respectively. Thus, the second reinforcing beam 122 can be an integral beam structure or a split beam structure.

[0152] In some embodiments, the base frame 12 further comprises a second extension support 123. The second extension support 123 is connected to the second beam body 121 away from the external force. The length of the second extension support 123 is greater than or equal to the length of the second reinforcing beam segment 1221.

[0153] It can be understood that the second extension support 123 can improve the stability of the protection support to prevent the lower end of the protection support from deforming and losing stability when subjected to a collision.

[0154] Based on the length of the second extension support 123 being greater than or equal to the length of the second reinforcing beam segment 1221, the second extension support 123 covers at least the width direction of one battery cell to ensure the stabilizing effect.

[0155] For example, the length of the second extension support 123 is three times the length of the second reinforcing beam segment 1221, so that the second extension support 123 can cover the top surfaces of the fourth battery cell, the fifth battery cell, and the sixth battery cell.

[0156] The length of the second extension support 123 refers to the distance of the second extension support 123 extending in the first direction. The length of the second reinforcing beam segment 1221 refers to the distance of the second reinforcing beam segment 1221 extending in the first direction.

[0157] The protection support in the embodiments of the present application can effectively increase the height of the side surface of the battery cell, improve the force transmission capacity of the battery cell to the external force, protect the battery cell during the collision process, inhibit the deformation of the outermost battery cell to be too concentrated, relieve the internal stress and strain distribution of the outermost battery cell, and reduce the maximum internal strain of the outermost battery cell by about 35%. The allowable intrusion amount of the battery pack is increased by about 12%. Thus, the risk of rupture of the diaphragm and metal foil in the battery cell due to impact, resulting in thermal runaway of the battery cell, can be effectively reduced.

[0158] As shown in FIG. 1, Figure 2 The protection support provided by the embodiments of the present application is a hollow structure, and does not increase the shielding area of the battery cell, the cooling and heat dissipation process of the battery pack, and the process difficulty of production and installation. Moreover, the protection support does not need to be rigidly and / or flexibly connected with the upper and lower cover plates and the threshold beam of the battery pack, and does not need to adjust the production process of the battery pack and the vehicle production process.

[0159] As shown in FIG. 1, Figure 10 and Figure 11 As shown in FIG. 1,

[0160] As shown in FIG. 1,Figure 12 and Figure 13 As shown, the protective bracket provided in this embodiment, when applied to the battery cells of the battery pack, can evenly distribute the deformation of the outermost cell (cell 1) to cells 1 through 4, compared to cells without protective brackets in related technologies. This allows each cell to undergo slight deformation, preventing cell damage. In contrast, in related technologies without protective brackets, all the impact force is concentrated on the outermost cell (cell 1), resulting in greater deformation and a higher risk of failure, thermal runaway, and a chain reaction that gradually ignites the remaining undamaged cells. The protective bracket in this embodiment transmits and distributes the impact force to multiple cells, preventing excessively concentrated deformation of the outermost cells, reducing the likelihood of battery pack explosion, and avoiding safety hazards.

[0161] According to a second aspect of this application, a battery pack is provided that includes the aforementioned protective bracket. This battery pack possesses all the beneficial effects of the aforementioned protective bracket, which will not be elaborated further herein.

[0162] When the battery pack requires potting, the protective bracket can be covered with thermally conductive adhesive. The solidified thermally conductive adhesive does not affect the deformation of the protective bracket. Furthermore, because the protective bracket is made of steel or titanium alloy, it possesses excellent thermal conductivity, reaching 40W / mK to 50W / mK (watts per meter * Kelvin), while the thermal conductivity of the adhesive is typically in the range of 1W / mK to 20W / mK. Therefore, the battery pack using this protective bracket can significantly improve heat dissipation. The heat generated during battery charging and discharging can be quickly dissipated to the surrounding area through the protective bracket, improving the efficiency of the battery pack's thermal management system by at least 5%.

[0163] The protective bracket can cover the entire length of the battery pack. Or, as... Figure 6 and Figure 7 As shown, the protective bracket can be designed according to requirements, thus avoiding the need to cover all areas along the length of the battery pack, achieving precise design and improving material utilization.

[0164] For example, based on vehicle collision accidents and vehicle crash test conditions, the most vulnerable locations of the vehicle's battery pack can be identified. Protective brackets can then be installed at these locations, with the appropriate length selected to achieve a protective effect. Alternatively, the length and installation location of the protective brackets can be chosen based on the user's design requirements.

[0165] According to a third aspect of this application, a vehicle is provided that includes the aforementioned battery pack, and the vehicle has all the beneficial effects of the aforementioned battery pack, which will not be elaborated further herein.

[0166] The vehicle can be a plug-in hybrid electric vehicle or a new energy vehicle, and the present application does not make specific limitation thereto.

[0167] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0168] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0169] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0170] The above is only the preferred embodiment of the present application, and does not limit the present application in any form, but any simple modification, equivalent change and modification made to the above embodiment without departing from the technical solution content of the present application and in accordance with the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A protective bracket applied to an electric core, characterized in that, The application relates to a battery rack, comprising: a rack body configured to abut against a top surface and / or a bottom surface of the battery cell; at least two spaced longitudinal beam assemblies arranged at an angle with the rack body, and each adjacent two longitudinal beam assemblies are used for placing the battery cell, wherein the longitudinal beam assemblies are configured to abut against a side surface of the battery cell; wherein the rack body is configured to deform under an external force, so as to displace the longitudinal beam assemblies and drive the corresponding battery cell to deform.

2. The guard bracket of claim 1, wherein The rack body comprises a top rack and a bottom rack, the top rack is configured to abut against the top surface of the battery cell, and the bottom rack is configured to abut against the bottom surface of the battery cell, wherein at least two longitudinal beam assemblies are connected between the top rack and the bottom rack.

3. The guard bracket of claim 2, wherein, The top rack comprises: at least two first beam bodies spaced in a first direction, each first beam body extends in a second direction, each longitudinal beam assembly extends in a third direction, wherein each longitudinal beam assembly is connected to a first beam body; a first reinforcing beam extending in the second direction, and the first reinforcing beam is connected to the at least two first beam bodies; wherein any two of the first direction, the second direction and the third direction are arranged at an angle.

4. The guard bracket of claim 3, wherein, The longitudinal beam assemblies and the first beam bodies are spaced in the first direction to at least three, and at least two mounting areas for placing the battery cell are defined, wherein the at least two mounting areas divide the first reinforcing beam into at least two first reinforcing beam segments, and the cross-sectional areas of the at least two first reinforcing beam segments satisfy a preset variation rule in the first direction, so that the deformation amounts of the first reinforcing beam segments are the same.

5. The guard bracket of claim 4, wherein, The preset variation rule comprises: the cross-sectional area of the first reinforcing beam segment located in the same mounting area decreases in the first direction; and / or, the cross-sectional area of the first reinforcing beam segment located in different mounting areas decreases in the first direction.

6. The guard bracket of claim 5, wherein, In the first direction, the longitudinal beam assemblies and the first beam bodies define three mounting areas, which are a first mounting area, a second mounting area and a third mounting area, wherein the cross-sectional area of the first reinforcing beam segment located in the first mounting area is S1, the cross-sectional area of the first reinforcing beam segment located in the second mounting area is S2, and the cross-sectional area of the first reinforcing beam segment located in the third mounting area is S3, and 1 / 2S1≤S2≤2 / 3S1, 1 / 3S1≤S3≤1 / 2S1 are satisfied.

7. The guard bracket of claim 6, wherein, The first reinforcing beam segments located in the second mounting area and the third mounting area are arranged in an arc-shaped structure and are curved in the plane corresponding to the first direction and the second direction.

8. The guard bracket of claim 7, wherein, The curvature change rate of the arc-shaped first reinforcing beam segment is X1, and 5 degrees / cm≤X1≤25 degrees / cm is satisfied.

9. The guard bracket of claim 7, wherein, The curvature of the arc-shaped first reinforcing beam segment is Y1, and 5 degrees≤Y1≤25 degrees is satisfied.

10. The guard bracket of claim 4, wherein, The at least two first reinforcing beam segments are integrally formed, or each first reinforcing beam segment is connected between two adjacent first beam bodies.

11. The guard bracket of any one of claims 4 to 10, wherein, The top rack further comprises: A first extension bracket is connected to the first beam body away from the external force, wherein the length of the first extension bracket is greater than or equal to the length of the first reinforcing beam segment.

12. The guard bracket of claim 2, wherein, The base frame includes: At least two second beams spaced apart along a first direction, each second beam extending along a second direction, and each longitudinal beam assembly extending along a third direction, wherein each longitudinal beam assembly is connected to a second beam; A second reinforcing beam extends along the second direction and is connected to the at least two second beam bodies; Wherein, any two of the first direction, the second direction, and the third direction are set at an angle.

13. The guard bracket of claim 12, wherein, The longitudinal beam assembly and the second beam body are each spaced at least three along the first direction, defining at least two installation areas for placing the battery cell. The at least two installation areas divide the second reinforcing beam into at least two second reinforcing beam segments. Along the first direction, the cross-sectional area of ​​the at least two second reinforcing beam segments satisfies a preset variation rule so that the deformation of each second reinforcing beam segment is the same.

14. The guard bracket of claim 13, wherein, The preset variation rules include: along the first direction, the cross-sectional area of ​​the second reinforcing beam segment located in the same installation area decreases; and / or, along the first direction, the cross-sectional area of ​​the second reinforcing beam segment located in different installation areas decreases.

15. The guard bracket of claim 14, wherein, Along the first direction, the longitudinal beam assembly and the second beam body define three installation areas, namely a first installation area, a second installation area, and a third installation area. The cross-sectional area of ​​the second reinforcing beam segment located in the first installation area is S4, the cross-sectional area of ​​the second reinforcing beam segment located in the second installation area is S5, and the cross-sectional area of ​​the second reinforcing beam segment located in the third installation area is S6, satisfying: 1 / 2S4≤S5≤2 / 3S4, 1 / 3S4≤S6≤1 / 2S4.

16. The guard bracket of claim 15, wherein, The second reinforcing beam segment located in the second installation area and the third installation area is configured as an arc-shaped structure and is bent in the plane corresponding to the first direction and the second direction.

17. The guard bracket of claim 16, wherein, The arc-shaped second reinforcing beam segment has a curvature variation rate of X2, which satisfies: 5 degrees / cm ≤ X2 ≤ 25 degrees / cm.

18. The guard bracket of claim 16, wherein, The arc of the second reinforcing beam segment is Y2, which satisfies the following condition: 5 degrees ≤ Y2 ≤ 25 degrees.

19. The guard bracket of claim 13, wherein, The at least two second reinforcing beam segments are integrally formed, or each second reinforcing beam segment is connected between two adjacent second beams.

20. The guard bracket of any one of claims 13 to 19, wherein, The base frame also includes: The second extension bracket is connected to the second beam body away from the external force, wherein the length of the second extension bracket is greater than or equal to the length of the second reinforcing beam segment.

21. The guard bracket of claim 1, wherein, The longitudinal beam assembly includes at least two longitudinal beams spaced apart along a second direction, wherein the distance between two adjacent longitudinal beams is D, satisfying: 10 mm ≤ D ≤ 25 mm.

22. A battery pack, characterized by Includes the protective bracket as described in any one of claims 1 to 21.

23. A vehicle characterized by comprising: Includes the battery pack as described in claim 22.

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