Battery case and battery pack

Abstract

A battery case and a battery pack. The battery case comprises: a bottom plate; side plates surrounding the periphery of the bottom plate (10) and jointly forming an accommodating cavity with the bottom plate, the accommodating cavity being used for accommodating battery modules; and a plurality of protruding portions (40) arranged in the accommodating cavity and located on the bottom plate (10), wherein the protruding portions (40) protrude from the bottom plate (10) in a first direction, the plurality of protruding portions (40) are arranged in an array in a second direction and a third direction, the tops of the protruding portions (40) are in contact with the bottoms of the battery modules so as to support the battery modules, and the first direction, the second direction and the third direction are perpendicular to each other in pairs.

Description

Battery box and battery pack

[0001] The present application claims priority to the Chinese patent application No. 202421590877.6, filed on July 5, 2024, with the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery box, in particular to a battery box and a battery pack. BACKGROUND

[0003] The power battery is the main power energy source of the current pure electric vehicle, and is one of the important factors affecting the performance of the pure electric vehicle. The safety of the battery directly affects the safety of the vehicle. At present, the battery box is used as the carrier of the battery module, and plays a key role in the safe operation and protection of the battery module. SUMMARY

[0004] In the related art, the battery box is prone to structural deformation after being subjected to vibration impact, thereby causing damage to the battery module inside the battery box, which is not conducive to the normal operation of the battery module, and thus cannot meet the use requirements of users.

[0005] Therefore, it is urgent to design a battery box and a battery pack to solve the technical problems.

[0006] In a first aspect, the present application provides a battery box, which comprises a bottom plate, a side plate, a containing cavity formed by the bottom plate and the side plate, the containing cavity being used for containing a battery module, a plurality of protruding parts arranged on the bottom plate in the containing cavity, the protruding parts being arranged in a protruding manner along a first direction, and the plurality of protruding parts being arranged in an array along a second direction and a third direction, a top part of the protruding part being used for contacting a bottom part of the battery module to support the battery module, and the first direction, the second direction and the third direction being perpendicular to each other.

[0007] In a second aspect, the present application further provides a battery pack, which comprises a battery box and a battery module arranged in the containing cavity of the battery box. ADVANTAGEOUS EFFECTS

[0008] The battery box provided by the application is provided with a plurality of protruding portions on the bottom of the battery box, the protruding portions protrude from the bottom plate along a first direction, the plurality of protruding portions are arranged along a second direction and a third direction, and the top of the protruding portion is used for contacting the bottom of the battery module to support the battery module. By arranging the above structure, the battery module can be supported, the structural strength of the bottom of the battery box can be increased, the probability of deformation of the bottom of the battery box can be reduced as much as possible when the bottom of the battery box is impacted by the outside, and the battery module in the battery box can be protected to ensure normal operation of the battery module.

[0009] The battery pack provided by the application can ensure the stability of the battery module during operation by arranging the battery module in the accommodating cavity of the battery box. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is a perspective view of the battery box provided by the embodiment;

[0011] Fig. 2 is a perspective view of the battery box provided by the embodiment from another angle;

[0012] Fig. 3 is a top view of the battery box provided by the embodiment;

[0013] Fig. 4 is a sectional view of A-A in Fig. 3;

[0014] Fig. 5 is a perspective view of the battery pack provided by the embodiment;

[0015] Explanation of reference signs:

[0016] 1, battery box;

[0017] 10, bottom plate; 11, periphery;

[0018] 20, side plate;

[0019] 30, accommodating cavity;

[0020] 40, protruding portion;

[0021] 50, recess structure;

[0022] 60, reinforcing member;

[0023] 70, battery module;

[0024] X, first direction; Y, second direction; Z, third direction. Embodiment of the application

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only 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 those skilled in the art without creative work fall within the scope of the present application.

[0026] As shown in FIGS. 1-4, in a first aspect, embodiments of the present application provide a battery box 1, which comprises a bottom plate 10, a side plate 20, a containing cavity 30 formed by the bottom plate 10 and the side plate 20, and used for containing a battery module 70, and a plurality of protruding portions 40 arranged on the bottom plate 10 in the containing cavity 30, the protruding portions 40 protrude from the bottom plate 10 along a first direction, and the plurality of protruding portions 40 are arranged along a second direction and a third direction, the top of the protruding portions 40 is used for contacting the bottom of the battery module 70 to support the battery module 70, and the first direction, the second direction and the third direction are perpendicular to each other.

[0027] According to the technical solutions of the present application, the plurality of protruding portions 40 are arranged on the bottom of the battery box 1, the protruding portions 40 protrude from the bottom plate 10 along the first direction, and the plurality of protruding portions 40 are arranged along the second direction and the third direction, the top of the protruding portions 40 is used for contacting the bottom of the battery module 70 to support the battery module 70, by arranging the above structure, the battery module 70 can be supported, and the structural strength of the bottom of the battery box 1 can be increased, when the bottom of the battery box 1 is impacted by the outside, the probability of deformation of the bottom of the battery box 1 can be reduced as much as possible, so that the battery module 70 in the battery box 1 can be protected, and the battery module 70 can operate normally.

[0028] In the present application, the containing cavity 30 can also be used for containing cooling liquid to cool the battery module 70, and the battery module 70 can be completely soaked in the cooling liquid, or the battery module 70 can be partially soaked in the cooling liquid, the specific arrangement should be selected according to the use environment of the device, so that the applicability and application range of the battery box 1 can be improved.

[0029] In the present application, the protruding portion 40 and the bottom plate 10 are integrally formed by extrusion, and the integrally formed technology can complete the manufacturing of complex shape and structure in a short time, significantly improving the production efficiency, thereby facilitating the production of the assembly. Compared with the multi-process and assembly process in the traditional processing method, the integrally formed technology can complete the manufacturing at one time, thereby reducing the production cycle and improving the production efficiency of the bottom plate 10. At the same time, the integrally formed structure can realize high-precision manufacturing of the bottom plate 10, which is beneficial to reduce the production defect rate of the bottom plate 10 and improve the reliability and stability of the bottom plate 10. And by precisely controlling the forming process parameters of the bottom plate 10 such as temperature, pressure and time, the dimensional accuracy and surface quality of the bottom plate 10 can be ensured.

[0030] Further, the integrally formed technology can realize the optimized utilization of metal materials, reduce material waste and energy consumption. When selecting metal materials, precise selection can be made according to specific application scenarios and requirements to meet the performance requirements of the bottom plate 10. At the same time, the integrally formed structure avoids the strength reduction problem that may occur in the traditional welding process, improving the overall strength of the bottom plate 10. Moreover, integrally forming can fully utilize the low density characteristics of the material to greatly reduce the weight of the bottom plate 10. This helps to reduce the overall weight of the bottom plate 10. Furthermore, the integrally formed technology can significantly reduce the production cost of the bottom plate 10 by reducing the number of production lines and the process of welding links of parts, thereby facilitating the mass production of the battery box 1. At the same time, due to the improvement of production efficiency, the labor cost is also reduced.

[0031] In the present application, the battery box 1 can be made of metal materials, including but not limited to aluminum alloy, stainless steel and other materials suitable for making the battery box 1. That is, the bottom plate 10 and the frame can be made of metal materials, including but not limited to aluminum alloy, stainless steel and other materials suitable for making the battery box 1.

[0032] Because the density of aluminum alloy is low, only about 1 / 3 of that of steel, but the strength is relatively high. This means that using aluminum alloy can improve the structural strength of the battery box 1 while greatly reducing the overall weight, thereby facilitating the transportation of the battery box 1. And the aluminum alloy surface is easy to form a dense oxide film, which can effectively prevent the contact of corrosive medium with the internal metal, thereby having good corrosion resistance. This makes the aluminum alloy maintain good stability in humid and corrosive environments, thereby prolonging the service life of the battery box 1.

[0033] Further, the aluminum alloy has good thermal conductivity, so that the heat of the battery box 1 can be timely exchanged with the outside. At the same time, the aluminum alloy has good plasticity and processability, and can be processed into various shaped and sized parts by casting, forging, rolling, extrusion and the like. In addition, the aluminum alloy can further improve its performance through heat treatment, surface treatment and the like.

[0034] Alternatively, the material of the battery box 1 can also be stainless steel. Stainless steel itself is a material that is not easy to rust, especially in humid and corrosive environments, its excellent corrosion resistance can ensure that the battery box 1 is used for a long time without being damaged. In addition, due to the integrated design of the battery box 1, it is not easy to crack, further enhancing its rust resistance. And stainless steel is not synthesized by epoxy resin, so there is no radiation and no radioactive material is released, which is environmentally friendly and meets the modern environmental protection requirements.

[0035] Specifically, the outer surface of the stainless steel is bright and has a good overall feeling, making the battery box 1 more visually appealing. At the same time, its surface is seamless, not only easy to clean, but also will not produce bacteria, increasing the use safety.

[0036] The stainless steel material has the characteristics of high temperature oxidation resistance and high strength, so the battery box 1 can maintain good stability in extreme conditions such as fire, reducing the safety risk.

[0037] Further, the surface of the box is basically seamless, and dust or rainwater is difficult to penetrate into the box, effectively protecting the battery from the outside environment. The stainless steel material has high strength and good hardness, and is not easy to deform under external impact, thereby ensuring the structural stability and safety of the battery box 1. The stainless steel battery box 1 is not easy to fade whether it is installed indoors or outdoors, and is easy to clean, only need to wipe it with a twisted wet cloth. At the same time, the material of stainless steel has good insulation, which is particularly important for the battery box 1, because it can effectively prevent electric arc discharge and short circuit accidents, increasing the safety of the battery box 1. In the present application, the material of the battery box 1 should be selected according to the actual use environment, so as to improve the applicability and scope of the battery box 1, which is not specifically limited here.

[0038] In the application, X is the first direction, Y is the second direction, and Z is the third direction.

[0039] In an embodiment, the height of the protrusion 40 protruding from the portion of the bottom plate 10 in the first direction is H, and 1mm≤H≤5mm. When H>5mm, the height of the protrusion 40 protruding from the portion of the bottom plate 10 in the first direction is too large, which causes the protrusion 40 to occupy too much space, and after the battery module 70 is placed in the battery box 1, the battery module 70 has a large spacing with the bottom plate 10, thereby wasting a part of the space, and also causing the battery box 1 to be too large, which is not conducive to the miniaturization development of the battery box 1. When H<1mm, the height of the protrusion 40 protruding from the portion of the bottom plate 10 in the first direction is too small, which is not convenient for the processing of the protrusion 40, thereby reducing the processing efficiency of the bottom plate 10. Therefore, 1mm≤H≤5mm not only reasonably utilizes the space of the accommodation cavity 30, but also does not cause the protrusion 40 to occupy too much space, and is convenient for the processing of the protrusion 40, thereby improving the processing efficiency of the bottom plate 10. Optionally, H can be set to 1mm, 3mm, or 5mm, and the specific setting should be selected according to the use environment of the protrusion 40, which is not limited here.

[0040] In an embodiment, the spacing of the plurality of protrusions 40 in the second direction is L2, the spacing of the plurality of protrusions 40 in the third direction is L3, and L2≥L3. In this way, the adjacent protrusions 40 do not interfere with each other, which is not only more convenient for the processing of the protrusion 40, but also can strengthen the structure of the bottom plate 10 as much as possible to improve the structural strength of the bottom plate 10.

[0041] In an embodiment, 5mm≤L2≤16mm, and 5mm≤L3≤16mm. When L2>16mm, the spacing of the plurality of protrusions 40 in the second direction is too large, which causes the protrusion 40 to occupy too much space, thereby not conducive to setting more number of protrusions 40. When L2<5mm, the spacing of the plurality of protrusions 40 in the second direction is too small, which can cause the adjacent two protrusions 40 to be too close and interfere with each other. Therefore, 5mm≤L2≤16mm not only reasonably utilizes the space of the accommodation cavity 30, but also does not cause the protrusion 40 to occupy too much space, thereby facilitating the setting of more number of protrusions 40, and also does not cause the adjacent protrusions 40 to interfere with each other. L2 can be set to 5mm, 10mm, or 16mm, and the specific setting should be selected according to the use environment of the protrusion 40, which is not limited here.

[0042] When L3> 16 mm, the interval of the plurality of protrusions 40 in the third direction is too large, which causes the protrusions 40 to occupy too much space, thereby being not conducive to arranging more protrusions 40. When L3< 5 mm, the interval of the plurality of protrusions 40 in the third direction is too small, which can cause the adjacent two protrusions 40 to be too close to each other to interfere with each other. Therefore, 5 mm≤L3≤16 mm, not only reasonably utilizes the space of the accommodation cavity 30, but also does not cause the protrusions 40 to occupy too much space, thereby being conducive to arranging more protrusions 40, and at the same time, does not cause the adjacent protrusions 40 to interfere with each other. L3 can be set to 5 mm, 10 mm, or 16 mm, etc. The specific setting should be selected according to the use environment of the protrusions 40, which is not limited here.

[0043] In an embodiment, the cross section of the protrusion 40 in the second direction is square and / or circular. In this application, the cross section of the protrusion 40 in the second direction is square. Alternatively, the cross section of the protrusion 40 in the second direction can also be set to trapezoidal or other shapes, as long as it can meet the use requirements of the battery box 1.

[0044] In an embodiment, the side of the bottom plate 10 away from the protrusion 40 is recessed with a recess structure 50, and the recess structure 50 is arranged corresponding to the protrusion 40. By setting the above structure, the material required for processing the bottom plate 10 can be reduced, thereby being conducive to reducing the weight of the bottom plate 10, and at the same time, being conducive to realizing the lightweight development of the bottom plate 10 while strengthening the structural strength of the bottom plate 10.

[0045] In an embodiment, the battery box 1 further comprises a reinforcing member 60, the reinforcing member 60 is arranged on the side of the bottom plate 10 away from the protrusion 40, and the reinforcing member 60 is connected with the recess structure 50. By setting the above structure, the structural strength of the bottom plate 10 can be further improved to prevent the bottom plate 10 from deforming during the operation of the battery box 1, thereby being conducive to prolonging the service life of the battery box 1 and maintaining the stable operation of the battery module 70.

[0046] In an embodiment, the battery box 1 comprises a plurality of reinforcing members 60, and the plurality of reinforcing members 60 are arranged at intervals in the second direction and / or the third direction. In this way, the structural strength of the bottom plate 10 can be improved as much as possible, thereby enabling the bottom plate 10 to meet the use requirements of users in different environments.

[0047] In an embodiment, the material of the reinforcing member 60 comprises 304 stainless steel. Since 304 stainless steel contains 18% chromium and 8% nickel, it has excellent corrosion resistance, can resist the corrosion of most chemical media, including acids, alkalis and salts, etc., and the passivation film formed on its surface can effectively resist corrosion and prolong the service life. Thus, it is beneficial to improve the service life of the reinforcing member 60. At the same time, 304 stainless steel has high high-temperature resistance and can maintain structural stability and mechanical properties at high temperatures, so that the reinforcing member 60 can be used at high temperatures.

[0048] At the same time, the reinforcing member 60 can also lift the battery box 1 to meet the use requirements of the battery box 1.

[0049] As shown in FIG. 5, in a second aspect, the embodiments of the present application provide a battery pack, which comprises the above-mentioned battery box 1; and a battery module 70 arranged in the accommodating cavity 30 of the battery box 1.

[0050] By using the technical solutions of the present application, a plurality of protruding portions 40 are arranged at the bottom of the battery box 1, and the protruding portions 40 are arranged along the first direction from the bottom plate 10, and the plurality of protruding portions 40 are arranged in an array along the second direction and the third direction, and the top of the protruding portion 40 is used to contact the bottom of the battery module 70 to support the battery module 70. By arranging the above structure, the battery module 70 can be supported, and the structural strength of the bottom of the battery box 1 can also be increased. When the bottom of the battery box 1 is impacted by the outside, the probability of deformation of the bottom of the battery box 1 can be reduced as much as possible, so that the battery module 70 in the battery box 1 can be protected, and the battery module 70 can operate normally.

Claims

1. A battery box, comprising: a bottom plate, a side plate surrounding a periphery of the bottom plate and jointly forming a receiving cavity with the bottom plate, the receiving cavity being configured to receive a battery module; a plurality of protrusions disposed on the bottom plate within the receiving cavity, the protrusions being disposed protruding the bottom plate in a first direction, and the plurality of protrusions being arranged in a second direction and a third direction, a top of the protrusions being configured to contact a bottom of the battery module to support the battery module, the first direction, the second direction, and the third direction being perpendicular to each other.

2. The battery pack of claim 1, wherein, A height of the protrusions protruding the bottom plate in the first direction is H, 1mm≤H≤5mm.

3. The battery pack of any one of claims 1-2, wherein, A spacing of the plurality of protrusions in the second direction is L2, and a spacing of the plurality of protrusions in the third direction is L3, L2≥L3.

4. The battery pack of claim 3, wherein, 5mm≤L2≤16mm, 5mm≤L3≤16mm.

5. The battery pack of any one of claims 1-4, wherein, A cross section of the protrusions in the second direction is square and / or circular.

6. The battery pack of any one of claims 1-4, wherein, A side of the bottom plate facing away from the protrusions is concave with a concave structure, the concave structure being configured to correspond to the protrusions.

7. The battery pack of claim 6, wherein, The battery box further comprises a reinforcing member, the reinforcing member being disposed on the side of the bottom plate facing away from the protrusions, and the reinforcing member being connected to the concave structure.

8. The battery pack of claim 7, wherein, The battery box comprises a plurality of the reinforcing members, the plurality of reinforcing members being arranged in the second direction and / or the third direction.

9. The battery pack of claim 7, wherein, A material of the reinforcing member comprises 304 stainless steel.

10. The battery pack of any one of claims 1-9, wherein, The protrusions and the bottom plate are integrally formed by extrusion.

11. The battery pack of any one of claims 1-9, wherein, A material of the battery box comprises metal. 12.A battery pack, comprising: the battery box according to any one of claims 1-11; a battery module disposed in the receiving cavity of the battery box.

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