Battery box body, battery pack and vehicle

Abstract

The utility model provides a battery box body, a battery pack and a vehicle, the battery box body comprises a front edge beam and a rear edge beam, and in the extension direction of the front edge beam and the rear edge beam, the height of the left end and / or the right end is lower than the height of the middle part; the left side beam is connected to the left ends of the front side beam and the rear side beam, the left ends of the front side beam and the rear side beam have the same height as the left side beam, the right side beam is connected to the right ends of the front side beam and the rear side beam, and the right ends of the front side beam and the rear side beam have the same height as the right side beam. In the battery box body, the height of at least one end of the front edge beam and the rear edge beam is reduced, the height of the left edge beam and / or the right edge beam is also reduced, the weight of the battery box body is reduced, and the reduced height of the end parts of the front edge beam and the rear edge beam and the reduced height of the left edge beam and / or the right edge beam can be compensated by the box body upper cover; and the box body upper cover with the same volume is lighter than the battery box body, so that the weight of the whole battery pack is reduced, and the requirement on light weight is met.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery box body, a battery pack and a vehicle. BACKGROUND

[0002] A battery box in the prior art comprises a battery box body and a battery upper cover, the battery box body and the battery upper cover enclose an installation cavity for installing a battery pack, the battery box body is usually made of metal material, and the battery upper cover is usually made of composite material. The volume proportion of the battery box body in the battery box in the prior art is large, which results in a large weight of the battery box and cannot meet the lightweight requirement. CONTENT OF THE UTILITY MODEL

[0003] The application aims to provide a battery box body, a battery pack and a vehicle, which basically meet the lightweight requirement.

[0004] To solve the above technical problem, the application provides a battery box body, which comprises:

[0005] The front side beam and the rear side beam have a height lower than that of the middle part in the extension direction of the front side beam and the rear side beam.

[0006] The left side beam is connected to the left end of the front side beam and the rear side beam, and the left end of the front side beam and the rear side beam has the same height as the left side beam. The right side beam is connected to the right end of the front side beam and the rear side beam, and the right end of the front side beam and the rear side beam has the same height as the right side beam.

[0007] In the battery box body, the front side beam and the rear side beam have an unequal height structure, the height of the middle part in the extension direction of the front side beam and the rear side beam is higher, which is beneficial to the installation of connectors and other structures. The height of the left end and / or the right end in the extension direction of the front side beam and the rear side beam is reduced. At the same time, the left end of the front side beam and the rear side beam has the same height as the left side beam, and the right end of the front side beam and the rear side beam has the same height as the right side beam, that is, the height of the left side beam and / or the right side beam is also reduced, which is beneficial to reducing the weight of the battery box body. The reduced height of the end part of the front side beam and the rear side beam and the reduced height of the left side beam and / or the right side beam can be compensated by the box upper cover. The box upper cover is usually made of composite material, and the weight of the box upper cover with the same volume is lighter than that of the battery box body, which is beneficial to reducing the weight of the entire battery pack and meeting the lightweight requirement.

[0008] Optionally, the upper surface of the middle part in the extension direction of the front side beam and the rear side beam forms a high sealing surface, the upper surface of the left end and / or the right end in the extension direction of the front side beam and the rear side beam forms a low sealing surface, and the height difference between the high sealing surface and the low sealing surface is H, and the value range of H is H<100 mm.

[0009] Optionally, the upper surface of the front side beam and the rear side beam further comprises an inclined sealing surface, the inclined sealing surface is connected between the high sealing surface and the low sealing surface, the inclined angle of the inclined sealing surface is α, and the value range of α is: α < 45°.

[0010] Optionally, the inclined sealing surface and the high sealing surface are connected by a fillet, the inclined sealing surface and the low sealing surface are connected by a fillet, and the radius of the fillet is not less than 50 mm.

[0011] Optionally, the front side beam is an integral structure formed by die casting, and the rear side beam is an integral structure formed by die casting.

[0012] Optionally, the left side beam and the right side beam are extrusion formed members.

[0013] Optionally, the front side beam and the rear side beam each comprise an inner bulging beam, the battery box further comprises a longitudinal beam, the longitudinal beam extends in the front-rear direction, and both ends of the longitudinal beam in the extension direction are connected to the corresponding inner bulging beams by bolts.

[0014] Optionally, the front side beam and the rear side beam further comprise an outer side beam and a support beam, the outer side beam is closer to the outside of the battery box than the inner bulging beam, the support beam extends in the front-rear direction and connects the inner bulging beam and the outer side beam,

[0015] The number of the support beams is not less than the number of the longitudinal beams, and at least one support beam is arranged at the connecting position of the longitudinal beam and the inner bulging beam.

[0016] The application also provides a battery pack comprising the battery box.

[0017] The battery pack has the same technical effects as the battery box, and details are not repeated here.

[0018] The application also provides a vehicle comprising the battery pack.

[0019] The vehicle has the same technical effects as the battery pack, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure schematic diagram of a specific embodiment of the battery box provided by the application;

[0021] Figure 2 The structure schematic diagram of a specific embodiment of the battery box provided by the application; Figure 1 The structure schematic diagram of a specific embodiment of the battery box provided by the application;

[0022] Figure 3 The structure schematic diagram of a specific embodiment of the battery box provided by the application; Figure 1The structural schematic diagram of the battery box from a second angle;

[0023] Figure 4 For Figure 3 The structural schematic diagram of the A area in the middle;

[0024] Figure 5 For Figure 2 The structural schematic diagram from a second angle;

[0025] Figure 6 For Figure 1 The exploded view of the battery box;

[0026] Among them, Figures 1-6 The reference signs in the drawings are as follows:

[0027] 1 - front beam;

[0028] 2 - rear beam; 21 - inner expansion beam; 22 - outer beam; 23 - support beam;

[0029] 3 - left beam;

[0030] 4 - right beam;

[0031] 5 - longitudinal beam;

[0032] 6 - liquid cooling plate;

[0033] 7 - liquid cooling plate support pad;

[0034] 8 - bottom guard plate;

[0035] a1 - high sealing surface; a2 - low sealing surface; a3 - inclined sealing surface. DETAILED DESCRIPTION

[0036] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0037] Please refer to Figures 1-6 , Figure 1 The structural schematic diagram of one specific embodiment of the battery box provided by the present application; Figure 2 For Figure 1 The structural schematic diagram of the rear beam in the middle; Figure 3 For Figure 1 The structural schematic diagram of the battery box from a second angle; Figure 4 For Figure 3 The structural schematic diagram of the A area in the middle; Figure 5 For Figure 2 The structural schematic diagram from a second angle; Figure 6 For Figure 1 The exploded view of the battery box.

[0038] The present embodiment provides a battery box, comprising:

[0039] In the extension direction of the front beam 1 and the rear beam 2, the height of the left end and / or the right end is lower than the height of the middle part.

[0040] Left beam 3 and right beam 4. Left beam 3 is connected to the left end of front beam 1 and rear beam 2. The left ends of front beam 1 and rear beam 2 are at the same height as left beam 3. Right beam 4 is connected to the right end of front beam 1 and rear beam 2. The right ends of front beam 1 and rear beam 2 are at the same height as right beam 4.

[0041] With the front and rear of the vehicle as the reference, when the battery box is installed on the vehicle body, the side beam near the front of the vehicle is the front side beam 1, and the side beam near the rear of the vehicle is the rear side beam 2.

[0042] In this embodiment, the front beam 1 and rear beam 2 of the battery box adopt a structure with unequal heights. The middle part of the extension direction of the front beam 1 and rear beam 2 is relatively high, which facilitates the installation of connectors and other structures. The height of the left and / or right ends of the extension direction of the front beam 1 and rear beam 2 is reduced. At the same time, the left end of the front beam 1 and rear beam 2 has the same height as the left beam 3, and the right end of the front beam 1 and rear beam 2 has the same height as the right beam 4. That is, the height of the left beam 3 and / or right beam 4 is also reduced, which helps to reduce the weight of the battery box. The reduced height of the ends of the front beam 1 and rear beam 2, and the reduced height of the left beam 3 and / or right beam 4 can be compensated by the top cover of the box. The top cover of the box is usually made of composite material. The top cover of the box is lighter than the battery box of the same volume, which helps to reduce the weight of the entire battery pack and meet the requirements of lightweighting.

[0043] Depend on Figure 5 As can be seen, in this embodiment, the front beam 1 and the rear beam 2 have a structure that is high in the middle and low at both ends in their extension direction. At this time, the height of the left beam 3 and the right beam 4 are reduced. The reduction in the height of the left beam 3 and the right beam 4 is compensated by the top cover of the box, which helps to further reduce the weight of the battery box and further meet the requirements of lightweighting.

[0044] Furthermore, the heights of the left and right ends of the front beam 1 and the rear beam 2 can be equal or unequal. If the left end of the front beam 1 and the right end of the rear beam 2 is higher and the right end is lower, then the height of the left beam 3 is greater than the height of the right beam 4. If the right end of the front beam 1 and the rear beam 2 is higher and the left end is lower, then the height of the right beam 4 is greater than the height of the left beam 3. If the heights of the left and right ends of the front beam 1 and the rear beam 2 are equal, then the left beam 3 and the right beam 4 have the same height. Since the left beam 3 and the right beam 4 have the same structure, the left beam 3 and the right beam 4 can be processed and formed using the same tooling, improving the processing convenience and efficiency of the left beam 3 and the right beam 4, which is a more preferred technical solution.

[0045] In some embodiments of the present application, the left beam 3 can be welded to the left ends of the front beam 1 and the rear beam 2, and the right beam 4 can be welded to the right ends of the front beam 1 and the rear beam 2, so as to ensure the connection strength of the front beam 1, the rear beam 2, the left beam 3 and the rear beam 2, and improve the structural stability of the battery box.

[0046] Please continue to refer to Figure 4 and Figure 5 In the present embodiment, the upper surface of the middle part of the front beam 1 and the rear beam 2 in the extending direction thereof forms a high sealing surface a1, and the upper surface of the left end and / or the right end of the front beam 1 and the rear beam 2 in the extending direction thereof forms a low sealing surface a2, and the height difference between the high sealing surface a1 and the low sealing surface a2 is H, and the value range of H is: H < 100 mm.

[0047] It can be understood that there is a height difference between the high sealing surface a1 and the low sealing surface a2, and the high sealing surface a1 and the low sealing surface a2 need to be connected and transitioned by the inclined sealing surface a3. If the height difference between the high sealing surface a1 and the low sealing surface a2 is too large, it may cause the inclination angle of the inclined sealing surface a3 to be too large, and thus the sealing element at this position cannot be uniformly stressed when compressed, and the sealing element cannot be effectively compressed, thereby reducing the sealing performance of the battery box. It has been verified that when H < 100 mm, the sealing element can be uniformly stressed when compressed, the sealing element can be effectively compressed, and the sealing performance of the battery box is ensured. The height difference between the high sealing surface a1 and the low sealing surface a2 can be designed by comprehensively considering the sealing performance and the lightweight requirement, and the value of H can be 80 mm, 70 mm, 60 mm, etc.

[0048] Please continue to refer to Figure 4 and Figure 5 In the present embodiment, the upper surface of the front beam 1 and the rear beam 2 further comprises an inclined sealing surface a3, the inclined sealing surface a3 is connected between the high sealing surface a1 and the low sealing surface a2, and the inclination angle of the inclined sealing surface a3 is α, and the value range of α is: α < 45°.

[0049] The sealing element is usually sealed by compression. If the inclination angle of the sealing surface is too large, it may cause the sealing element to be unable to be uniformly stressed when compressed, and the sealing element to be unable to be effectively compressed, thereby reducing the sealing performance of the battery box. It has been verified that when α < 45°, the sealing element can be uniformly stressed when compressed, the sealing element can be effectively compressed, and the sealing performance of the battery box is ensured. The value of α can be 40°, 35°, 30°, etc.

[0050] Please continue to refer to Figure 5 In the present embodiment, the inclined sealing surface a3 and the high sealing surface a1 are connected by a round corner, the inclined sealing surface a3 and the low sealing surface a2 are connected by a round corner, and the radius of the round corner is not less than 50 mm.

[0051] It can be understood that if the radius of the fillet between the inclined sealing surface a3 and the high sealing surface a1 is too small, the seal at this position cannot be uniformly stressed when compressed, and the seal cannot be effectively compressed, thereby reducing the sealing performance of the battery box. It has been verified that when the radius of the fillet between the inclined sealing surface a3 and the high sealing surface a1 is not less than 50 mm, the seal can be uniformly stressed when compressed, the seal can be effectively compressed, and the sealing performance of the battery box is guaranteed. Among them, the radius of the fillet can be 50 mm, 60 mm, 80 mm, etc.

[0052] Similarly, if the radius of the fillet between the inclined sealing surface a3 and the low sealing surface a2 is too small, the seal at this position cannot be uniformly stressed when compressed, and the seal cannot be effectively compressed, thereby reducing the sealing performance of the battery box. It has been verified that when the radius of the fillet between the inclined sealing surface a3 and the low sealing surface a2 is not less than 50 mm, the seal can be uniformly stressed when compressed, the seal can be effectively compressed, and the sealing performance of the battery box is guaranteed. Among them, the radius of the fillet can be 50 mm, 60 mm, 80 mm, etc.

[0053] Among them, the radius of the fillet between the inclined sealing surface a3 and the high sealing surface a1, and the radius of the fillet between the inclined sealing surface a3 and the low sealing surface a2 can be the same or different.

[0054] Further, in some embodiments of the present application, the front beam 1 is an integral structure formed by die casting, and the rear beam 2 is an integral structure formed by die casting.

[0055] As arranged above, on the one hand, the number of parts of the front beam 1 and the rear beam 2 can be reduced, the machining steps of the front beam 1 and the rear beam 2 can be simplified, and the production efficiency of the front beam 1 and the rear beam 2 can be improved; on the other hand, the welding operation of the battery box is greatly reduced, which is conducive to reducing the cost, reducing the deformation, and improving the dimensional accuracy of the battery box.

[0056] Among them, the front beam 1 and the rear beam 2 can be made of aluminum alloy material. The aluminum alloy material has high strength and can effectively resist external impact, and at the same time, it is light in weight, which helps to reduce the weight of the entire battery box.

[0057] Further, in some embodiments of the present application, the left beam 3 and the right beam 4 are extrusion molded parts.

[0058] As arranged above, the left beam 3 and the right beam 4 are formed by extrusion molding process, which can effectively improve the processing convenience of the left beam 3 and the right beam 4, improve the production efficiency of the left beam 3 and the right beam 4, and the left beam 3 and the right beam 4 formed by extrusion molding process have high dimensional accuracy, which is conducive to reducing the machining error of the left beam 3 and the right beam 4.

[0059] The left side beam 3 and the right side beam 4 can be made of aluminum material. Aluminum material has high strength and can effectively resist external force impact. At the same time, it is light in weight, which helps to reduce the weight of the entire battery box.

[0060] Please continue to refer to Figure 1 and Figure 3 In some embodiments of the present application, the front side beam 1 and the rear side beam 2 each include an inner expansion beam 21. It can be understood that the battery will change in volume, i.e. expand, during charging and discharging. If not controlled, such expansion can cause damage to the internal structure of the battery, and even cause safety hazards. The provision of the inner expansion beam 21 as described above can limit the excessive expansion of the battery, thereby protecting the battery from damage; at the same time, the inner expansion beam 21 can also fix the battery by limiting its position, to ensure the stability of the battery during operation; in addition, the inner expansion beam 21 can also improve the structural strength of the battery box, to ensure that the battery box will not easily deform when subjected to external force.

[0061] Further, as shown in Figure 1 , in the present embodiment, the battery box further includes a longitudinal beam 5 extending in the front-rear direction, and the two ends of the longitudinal beam 5 in the extension direction are connected to the corresponding inner expansion beams 21 by bolts.

[0062] In the battery pack, the battery is mounted on the longitudinal beam 5 inside the battery box, which plays a role in stabilizing and bearing the battery, to ensure the stability of the battery during vehicle driving; at the same time, the two ends of the longitudinal beam 5 in the extension direction are connected to the corresponding inner expansion beams 21, and when the inner expansion beams 21 bear the expansion force, the longitudinal beam 5 can generate an inward pulling force on the inner expansion beams 21, to assist the inner expansion beams 21 in resisting the expansion force and improve the structural stability of the inner expansion beams 21; in addition, the two ends of the longitudinal beam 5 in the extension direction are connected to the corresponding inner expansion beams 21 by bolts, which can effectively reduce the welding operation of the battery box, reduce the possibility of deformation of the battery box, and the bolt connection strength is higher than that of welding, therefore, the two ends of the longitudinal beam 5 in the extension direction are connected to the corresponding inner expansion beams 21 by bolts, which can improve the connection strength of the longitudinal beam 5 and the inner expansion beams 21, to ensure the reliable connection between the longitudinal beam 5 and the inner expansion beams 21.

[0063] Please continue to refer to Figure 4 , in the present embodiment, the front side beam 1 and the rear side beam 2 further include an outer side beam 22 and a support beam 23, the outer side beam 22 is closer to the outside of the battery box than the inner expansion beam 21, the support beam 23 extends in the front-rear direction and connects the inner expansion beam 21 and the outer side beam 22,

[0064] The number of support beams 23 is not less than the number of longitudinal beams 5, and at least one support beam 23 is provided at the connection position of the longitudinal beam 5 and the inner expansion beam 21.

[0065] As arranged above, the longitudinal beam 5 and the corresponding support beam 23 form a force transmission path extending in the front-rear direction, when one end of the battery box is subjected to an outward-inward collision force, the collision force will first act on the outer side beam 22, and then the collision force will be transmitted along the force transmission path of the longitudinal beam 5 and the support beam 23, avoiding the collision force acting on the battery and other components inside the battery box, protecting the safety of the battery and other components inside the battery box; when the battery expands, the expansion force acts on the inner expansion beam 21, the longitudinal beam 5 can generate an inward pulling force on the inner expansion beam 21, the support beam 23 can generate an inward supporting force on the inner expansion beam 21, both the support beam 23 and the longitudinal beam 5 can assist the inner expansion beam 21 to resist the expansion force, improve the structural stability of the inner expansion beam 21, limit the excessive expansion of the battery, and protect the battery from damage.

[0066] Please refer to Figure 6 , Figure 6 for Figure 1 the split view of the battery box.

[0067] The battery box of the embodiment further comprises a liquid cooling plate 6, which serves as the bottom wall of the battery box and can directly contact the heat accumulation area at the bottom of the battery, rapidly transferring the heat generated during the operation of the battery to the cooling liquid, effectively controlling the battery operating temperature within the optimal range, avoiding high temperature leading to battery performance degradation and safety reduction, prolonging the service life of the battery, and ensuring the stability of the battery performance; at the same time, liquid cooling has the advantage of good temperature uniformity, and the liquid cooling plate 6 as the bottom wall of the battery box can ensure that the temperature of each area at the bottom of the battery is uniform, reducing the inconsistency of battery performance caused by temperature differences, which is beneficial to the long-term stable operation of the battery; in addition, the liquid cooling plate 6 as the bottom wall of the battery box can also reduce the number of parts of the battery box, making the structure of the battery box more compact and the integration higher, reducing the weight and the occupation of the Z-direction space of the automobile, which is beneficial to the installation of the battery and improves the endurance mileage and performance of the automobile.

[0068] Further, the battery box of the embodiment further comprises a liquid cooling plate support pad 7 and a bottom guard plate 8, the bottom guard plate 8 is fixed to the edge beam of the battery box, and the bottom guard plate 8 is located below the liquid cooling plate 6, so that the bottom guard plate 8 can play a protective role for the internal components of the battery box (such as the liquid cooling plate 6 and the battery), reducing the possibility of damage to the internal components of the battery box (such as the liquid cooling plate 6 and the battery) caused by external impact, reducing the risk of battery damage, and protecting the safety and reliability of the battery; in addition, the bottom guard plate 8 can also improve the sealing performance of the battery box to prevent moisture and dust from entering the inside of the battery box.

[0069] The liquid cooling plate support pad 7 is arranged between the liquid cooling plate 6 and the bottom guard plate 8, and the liquid cooling plate support pad 7 is usually made of foamed material, so that the liquid cooling plate support pad 7 can effectively absorb various vibrations and impacts received by the battery pack during vehicle operation, reducing direct impact on the liquid cooling plate 6 and the battery, thereby protecting the safety of the battery.

[0070] The specific connection mode of the bottom guard plate 8 and the edge beam of the battery box body is not limited, for example, the bottom guard plate 8 and the edge beam of the battery box body can be fixed by welding or fixed by bolts and the like.

[0071] The embodiment also provides a battery pack comprising the battery box body.

[0072] The battery pack has the same technical effects as the battery box body, and details are not described herein again.

[0073] The embodiment also provides a vehicle comprising the battery pack.

[0074] The vehicle has the same technical effects as the battery pack, and details are not described herein again.

[0075] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A battery case characterized by comprising: The battery box body comprises: a front side beam (1) and a rear side beam (2), the height of the left end and / or the right end of the front side beam (1) and the rear side beam (2) in the extension direction thereof is lower than the height of the middle part thereof; a left side beam (3) connected to the left end of the front side beam (1) and the rear side beam (2), the left end of the front side beam (1) and the rear side beam (2) has the same height as the left side beam (3), and a right side beam (4) connected to the right end of the front side beam (1) and the rear side beam (2), the right end of the front side beam (1) and the rear side beam (2) has the same height as the right side beam (4).

2. The battery pack of claim 1, wherein The upper surface of the middle part of the front side beam (1) and the rear side beam (2) in the extension direction thereof forms a high sealing surface (a1), the upper surface of the left end and / or the right end of the front side beam (1) and the rear side beam (2) in the extension direction thereof forms a low sealing surface (a2), and the height difference between the high sealing surface (a1) and the low sealing surface (a2) is H, the value range of H is: H < 100 mm.

3. The battery pack of claim 2, wherein, The upper surface of the front side beam (1) and the rear side beam (2) further comprises an inclined sealing surface (a3) connected between the high sealing surface (a1) and the low sealing surface (a2), the inclination angle of the inclined sealing surface (a3) is α, and the value range of α is: α < 45°.

4. The battery pack of claim 3, wherein The inclined sealing surface (a3) and the high sealing surface (a1) are connected by a round corner, the inclined sealing surface (a3) and the low sealing surface (a2) are connected by a round corner, and the radius of the round corner is not less than 50 mm.

5. The battery pack of any one of claims 1-4, wherein, The front side beam (1) is an integral structure formed by die casting, and the rear side beam (2) is an integral structure formed by die casting.

6. The battery pack of any one of claims 1-4, wherein, The left side beam (3) and the right side beam (4) are extrusion molded parts.

7. The battery pack of any one of claims 1-6, wherein, The front side beam (1) and the rear side beam (2) each comprise an inner expansion beam (21), the battery box body further comprises longitudinal beams (5) extending in the front-rear direction, and the two ends of the longitudinal beams (5) in the extension direction thereof are connected to the corresponding inner expansion beams (21) by bolts.

8. The battery pack of claim 7, wherein, The front side beam (1) and the rear side beam (2) further comprise outer side beams (22) and support beams (23), the outer side beams (22) are closer to the outside of the battery box body than the inner expansion beams (21), the support beams (23) extend in the front-rear direction and connect the inner expansion beams (21) and the outer side beams (22), The number of the support beams (23) is not less than the number of the longitudinal beams (5), and at least one support beam (23) is arranged at the connection position of the longitudinal beam (5) and the inner expansion beam (21).

9. A battery pack, characterized by, The battery box body of any one of claims 1-8.

10. A vehicle characterized by comprising: The battery pack of claim 9.

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