Battery pack and vehicle

Abstract

The utility model relates to a battery pack and a vehicle, and relates to the technical field of batteries. The battery pack comprises a box body which comprises a base and a frame arranged on the base, and the frame comprises a side edge beam; the battery monomers are arranged on the base and are positioned in a range surrounded by the frame; each side beam comprises an inner side part, a main body part and an outer side part which are sequentially connected along the direction far away from the battery monomer, and at least partial area of the surface, close to the battery monomer, of the inner side part is a curved surface area bent towards the battery monomer; the boundary of the curved area away from the base is connected with the body part. And the safety can be improved.

Description

TECHNICAL FIELD

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

[0002] The battery of an electric vehicle is usually installed on the vehicle body. However, when the vehicle is running, it may be subjected to certain impact. It is necessary to ensure that the battery does not have problems such as breakage and liquid leakage inside the battery in the case of deformation due to impact, so as to avoid the risk of fire and explosion. The safety of the existing battery needs to be improved. SUMMARY

[0003] The present disclosure provides a battery pack and a vehicle, which can improve safety.

[0004] According to one aspect of the present disclosure, a battery pack is provided, comprising:

[0005] A box body comprising a base and a frame provided on the base, the frame comprising a side beam;

[0006] A plurality of battery cells provided on the base and located within a range surrounded by the frame;

[0007] The side beam comprises an inner side portion, a main body portion and an outer side portion connected in sequence in a direction away from the battery cells, at least a part of a surface of the inner side portion close to the battery cells is a curved surface area curved towards the battery cells, and a boundary of the curved surface area away from the base is connected with the main body portion.

[0008] In an exemplary embodiment of the present disclosure, the inner side portion is located on a side close to the base at one end of the battery cells away from the base; the surface of the inner side portion close to the battery cells further comprises a flat surface area; one end of the curved surface area is connected with the main body portion, and the other end is smoothly connected with the flat surface area; and the flat surface area is perpendicular to the base.

[0009] In an exemplary embodiment of the present disclosure, the outer side portion extends in a direction parallel to the base; and a normal projection of the outer side portion on the main body portion is located within a normal projection of the curved surface area on the main body portion.

[0010] In an exemplary embodiment of the present disclosure, a boundary of the curved surface area away from the base is coplanar with a surface of the outer side portion away from the base; and a boundary of the curved surface area close to the base is located on a side of the outer side portion close to the base.

[0011] In an exemplary embodiment of the present disclosure, the side beam further comprises:

[0012] A support portion is arranged on the side of the main body portion away from the battery monomer and on the side of the outer side portion close to the base; the outer side portion and the main body portion are connected through the support portion; the boundary of the curved surface area away from the base is located on the side of the support portion away from the base, and the boundary of the curved surface area close to the base is located between the boundary of the support portion close to the base and the boundary of the support portion away from the base.

[0013] In an exemplary embodiment of the present disclosure, the battery monomer and the inner side portion are arranged on the base, and the main body portion is at least partially arranged on the base; the battery pack further comprises an adhesive structure, the battery monomer is adhered to the base through the adhesive structure, and the adhesive structure is partially located between the inner side portion and the battery monomer.

[0014] In an exemplary embodiment of the present disclosure, the battery pack further comprises:

[0015] A buffer strip is arranged on the base and between the inner side portion and the adhesive structure.

[0016] In an exemplary embodiment of the present disclosure, the thickness of the buffer strip in the direction perpendicular to the base is less than the thickness of the inner side portion.

[0017] In an exemplary embodiment of the present disclosure, the inner side portion has a cavity, and at least one support rib plate is arranged in the cavity.

[0018] According to one aspect of the present disclosure, a vehicle is provided, comprising a vehicle body and the battery pack of any one of the above; the vehicle body is connected with the outer side portion.

[0019] The battery pack and the vehicle of the present disclosure can connect the vehicle body with the outer side portion of the side beam, thereby fixing the side beam on the vehicle body, and at the same time, the inner side portion of the side beam close to the battery monomer has a curved surface area, which is less likely to pierce the battery monomer and cause damage or leakage of the battery monomer when the side beam is impacted by the vehicle body; at the same time, the height of the curved surface area in the direction perpendicular to the base is not less than half of the thickness of the inner side portion in the direction perpendicular to the base, which can increase the contact area of the curved surface area with the battery monomer and further prevent the battery monomer from being damaged or leaking. Therefore, the safety of the battery pack and the vehicle can be improved.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, further serve to explain the principles of the present disclosure. It is apparent that the accompanying drawings are only some embodiments of the present disclosure, and other drawings can be obtained by those of ordinary skill in the art without creative effort based on the accompanying drawings.

[0022] Figure 1 A cross-sectional view of an embodiment of a side beam of a battery pack of the present disclosure.

[0023] Figure 2 A partial cross-sectional view of an embodiment of a battery pack of the present disclosure.

[0024] Figure 3 A partial cross-sectional view of a side beam and a side beam of an embodiment of a vehicle of the present disclosure.

[0025] Explanation of Reference Numerals:

[0026] 1. Side beam; 101. Cavity; 102. Support rib;

[0027] 2. Battery cell; 21. Tab;

[0028] 3. Inner side portion; 31. Curved surface area; 32. Flat surface area;

[0029] 4. Main body portion;

[0030] 5. Outer side portion; 51. Top surface; 52. Bottom surface;

[0031] 6. Bonding structure;

[0032] 7. Buffer strip;

[0033] 8. Heat exchange plate;

[0034] 9. Support portion;

[0035] 10. Side beam. DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the description of the figures and thus a detailed description of them will not be repeated. In addition, the drawings are only schematic and are not necessarily drawn to scale.

[0037] The terms "one", "a", "an", "the", and "at least one" are used to indicate the existence of one or more elements / components / etc.; the term "comprising" and "having" are used to indicate an open-ended inclusion of one or more elements / components / etc. in the description of a process, a method, an article, a creation, or a product, and that not all elements / components / etc. listed are required to be present in the process, method, article, creation, or product; the terms "first", "second", "third", etc. are used to indicate a relative order, and are not used to limit the number of objects.

[0038] As shown in Figures 1-3 The battery pack provided by the present disclosure can include a box body and battery cells 2, wherein:

[0039] The box body can include a base and a frame arranged on the base, and the frame includes a side beam 1. The side beam 1 can be connected with the vehicle body, and the battery pack can be mounted on the vehicle body.

[0040] The battery cells 2 can be arranged on the base and located within the range surrounded by the frame; the battery cells 2 include a plurality of battery cells 2.

[0041] The side beam 1 includes an inner side portion 3, a main body portion 4, and an outer side portion 5 connected in sequence in a direction away from the battery cells 2, and at least a partial region of the surface of the inner side portion 3 close to the battery cells 2 is a curved surface area 31 curved toward the battery cells 2; the boundary of the curved surface area 31 away from the base is connected with the main body portion 4.

[0042] In the battery pack of the present disclosure, the inner side portion 3 of the side beam 1 close to the battery cells 2 has the curved surface area 31, when the side beam 1 is impacted by the vehicle body, the side beam 1 will be deflected toward the battery cells 2, and the curved surface area 31 is not easy to pierce the battery cells 2, thereby preventing the battery cells 2 from being damaged or leaking; at the same time, since the curved surface area 31 is directly connected with the main body portion 4, the contact surface between the curved surface area 31 and the battery cells 2 can be increased, thereby further preventing the battery cells 2 from being damaged or leaking. Thus, the safety of the battery pack and the vehicle can be improved.

[0043] The structure of the battery pack of the present disclosure will be described in detail as follows:

[0044] As shown in Figures 1-3 The box body has a receiving cavity for accommodating the battery cells 2, and the box body can include a base and a frame arranged on the base, the frame is a closed structure extending around the edge of the base, and the receiving cavity is located in the space defined by the frame and the base; wherein:

[0045] The base can be used to carry the battery cells 2, for example, the base can include a tray and a heat exchange plate 8 arranged on the tray, the heat exchange plate 8 can exchange heat with each battery cell 2 through the internal flow of heat exchange medium, thereby cooling or keeping warm, preventing the battery cells 2 from being too high or too low in temperature.

[0046] The battery module and the inner side part 3 are arranged on the base, for example, on the surface of the heat exchange plate 8 away from the tray; the main body part 4 is arranged at least partially on the base, for example, at least partially on the tray; and the heat exchange plate 8 is defined on the side of the main body part 4 close to the battery module.

[0047] In some embodiments of the present disclosure, the main body part 4 can be arranged on the tray, and the inner side part 3 can be arranged on the heat exchange plate 8, so that the heat exchange plate 8 can be defined between the inner side part 3 and the tray.

[0048] The shape of the frame can be rectangular or other shapes, and can be surrounded by a plurality of side beams 10, each of which includes a side beam 1, which can be connected to the vehicle body to mount the box on the vehicle body.

[0049] In some embodiments of the present disclosure, the frame is rectangular and surrounded by two side beams 1 and two end beams 10, the two side beams 1 are oppositely arranged and distributed along a first direction, and the two end beams 10 are oppositely arranged and distributed along a second direction; the first direction and the second direction are perpendicular, and the first direction can be the width direction of the vehicle, and the second direction can be the length direction of the vehicle. When the vehicle is impacted from the side, the side beam 1 will be squeezed.

[0050] The side beam 1 can include an inner side part 3, a main body part 4 and an outer side part 5 connected in sequence in a direction away from the battery monomer 2, the outer side part 5 can be connected to the vehicle body, for example, the outer side part 5 can be connected to the side beam 10 of the vehicle body through a connecting member such as a bolt, or can be connected by welding; the inner side part 3 can be arranged towards the battery monomer 2, and the main body part 4 connects the outer side part 5 and the inner side part 3.

[0051] In addition, the box can further include a box cover, which can cover the side of the frame away from the bottom plate 11, so as to be surrounded by the frame and the base to form a containing cavity.

[0052] The number of battery monomers 2 can be multiple, and can be arranged on the base, for example, the battery monomers 2 can be arranged on the heat exchange plate 8, and each battery monomer 2 is located within the range surrounded by the frame. The battery monomer 2 can include a shell and a cell located in the shell, and the shell is provided with a tab 21 at the end away from the base, and the tab 21 is connected to the cell. At least part of the tabs 21 of the battery monomers 2 can be connected by a connecting member such as a bus bar to realize series and parallel connection of the battery monomers 2.

[0053] Each battery cell 2 can be connected into at least one battery module, and each battery cell 2 in one battery module can be connected in series or in association, and if two or more battery modules are used, the battery cells in different battery modules can be connected in parallel, so that when a part of the battery modules fails, the other battery modules can still supply power. Of course, different battery modules can also be connected in series to increase the output voltage. In addition, in order to facilitate the control of the battery module, the connection mode between the battery modules can be controlled by a control circuit to realize switching between series and parallel connection, and the specific structure of the control circuit is not limited herein.

[0054] The inventors found that when the vehicle is subjected to a side impact, i.e., an impact from the side of the direction of travel, the side beam 10 of the vehicle body is extruded and transmitted to the main body portion 4 through the outer side portion 5 of the side beam 1, causing the side beam 1 to be deformed as a whole and to be inclined toward the battery cell 2, as shown in FIG. 8. At this time, the inner side portion 3 can extrude the outer shell of the battery cell 2 closest to it, causing the battery cell 2 to be damaged and prone to liquid leakage, which affects the safety of the vehicle. Therefore, the inventors propose that the structure of the inner side portion 3 of the side beam 1 can be designed to reduce the risk of the inner side portion 3 piercing the battery cell 2. Specifically, as shown in FIG. 9, at least a part of the region of the inner side portion 3 close to the surface of the battery cell 2 can be a smooth curved surface region 31 that curves toward the battery cell 2, avoiding the presence of sharp corners that are prone to piercing the battery cell 2, and the curved surface region 31 can extend toward the main body portion 4 until the boundary of the curved surface region 31 away from the base meets the main body portion 4. When the side beam 1 is inclined toward the battery cell 2, the contact range of the curved surface region 31 with the battery cell 2 is large enough, so that the battery cell 2 is not easily pierced, preventing liquid leakage and improving safety. Figure 3 Figures 1-3 The shape of the curved surface region 31 can be a circular arc, an elliptical arc, a parabola, etc., and the shape thereof is not particularly limited herein. The center of curvature of the curved surface region 31 is located on the side of the curved surface region 31 away from the battery cell 2.

[0055] In some embodiments of the present disclosure, the inner side portion 3 is located on the side of the end of the battery cell 2 away from the base close to the base, that is, the end of the inner side portion 3 away from the base is not higher than the end of the battery cell 2 away from the base. At the same time, the surface of the inner side portion 3 close to the battery cell 2 can also include a planar region 32 that extends in a direction perpendicular to the base. One end of the curved surface region 31 is connected to the main body portion 4, and the other end is smoothly connected to the planar region 32. The planar region 32 can support the curved surface region 31, and compared to the case where the entire inner side portion 3 is in a curved surface shape, the structure of the combination of the curved surface region 31 and the planar region 32 is more stable and less likely to collapse. As shown in FIG. 10, the planar region 32 can extend from the end of the curved surface region 31 away from the base to the end of the inner side portion 3 close to the base, and the planar region 32 can be connected to the main body portion 4.

[0056] In some embodiments of the present disclosure, the inner side portion 3 is located on the side of the end of the battery cell 2 away from the base close to the base, that is, the end of the inner side portion 3 away from the base is not higher than the end of the battery cell 2 away from the base. At the same time, the surface of the inner side portion 3 close to the battery cell 2 can also include a planar region 32 that extends in a direction perpendicular to the base. One end of the curved surface region 31 is connected to the main body portion 4, and the other end is smoothly connected to the planar region 32. The planar region 32 can support the curved surface region 31, and compared to the case where the entire inner side portion 3 is in a curved surface shape, the structure of the combination of the curved surface region 31 and the planar region 32 is more stable and less likely to collapse. As shown in FIG. 10, the planar region 32 can extend from the end of the curved surface region 31 away from the base to the end of the inner side portion 3 close to the base, and the planar region 32 can be connected to the main body portion 4. Figures 1-3 ​As shown, point P schematically shows the junction between the main body 4 and the curved surface area 31, and point Q schematically shows the junction between the planar area 32 and the curved surface area 31.

[0057] The distance between the inner part 3 and the nearest battery cell 2 is D. The specific value range can be determined based on the arrangement of the battery cells 2 in the battery pack, vehicle collision safety simulation, and other conditions.

[0058] like Figures 1-3 As shown, in some embodiments of this disclosure, the outer portion 5 may extend in a direction parallel to the base; and the orthographic projection of the outer portion 5 on the main body 4 is within the orthographic projection of the curved area 31 on the main body 4, such that the thickness of the curved area 31 in the direction perpendicular to the base is greater than the thickness of the outer portion 5 in the direction perpendicular to the base, and in the direction perpendicular to the base, the area covered by the outer portion 5 is within the area covered by the curved area 31. By defining the range of the curved area 31 by the outer portion 5, it is beneficial to prevent the curved area 31 from being too small and reduce the risk of puncturing the battery cell 2.

[0059] Furthermore, in some embodiments of this disclosure, the boundary of the curved surface region 31 away from the base, i.e., the boundary that connects with the main body portion 4, may be coplanar with the surface of the outer side portion 5 away from the base, such as... Figure 1 As shown, the surface of the outer portion 5 away from the base is the top surface 51, and the surface near the base is the bottom surface 52. The boundary of the curved area 31 away from the base is coplanar with the top surface 51. This aligns the surface of the outer portion 5 away from the base with the boundary of the inner portion 3 away from the base, preventing them from separating and facilitating the transmission of force from the outer portion 5 to the inner portion 3. Simultaneously, the boundary of the curved area 31 near the base can be located on the side of the outer portion 5 closest to the base, making the range of the curved area larger than the range of the outer portion 5, which helps to increase the contact range between the curved area 31 and the battery cell 2.

[0060] like Figures 1-3 As shown, in some embodiments of this disclosure, the side beam 1 may further include a support portion 9, which may be located on the side of the main body 4 away from the battery cell 2 and on the side of the outer side 5 near the base; the outer side 5 and the main body 4 are connected by the support portion 9, thereby supporting the outer side 5 and preventing it from collapsing towards the base. The support portion 9 may form a certain angle with the base and together with the outer side 5 and the main body 4, form a triangular structure, thereby providing support. In addition, the boundary of the curved area 31 away from the base may be located on the side of the support portion 9 away from the base, and the boundary of the curved area 31 near the base may be located between the boundary of the support portion 9 near the base and the boundary away from the base, which is beneficial to expand the range of the curved area 31 while ensuring the structural stability of the inner side 3.

[0061] like Figures 1-3As shown, in some embodiments of this disclosure, the battery pack may also include an adhesive structure 6, which can be used to bond the battery cell 2 to the base, for example, to the heat exchange plate 8. The adhesive structure 6 may be made of thermally conductive structural adhesive. When bonding the battery cell 2, part of the adhesive structure 6 may be squeezed out between the inner side 3 and the battery module. When the side beam 1 is tilted toward the battery cell 2, the adhesive structure 6 may also play a certain buffering role.

[0062] like Figures 1-3 As shown, in some embodiments of this disclosure, the battery pack may also include a buffer strip 7, which may be disposed on the base. For example, the buffer strip 7 may be fixed to the surface of the heat exchange plate 8 away from the tray by adhesive or other means. The buffer strip 7 may be located between the inner side 3 and the adhesive structure 6 described above, and may have gaps with both the inner side 3 and the adhesive structure 6.

[0063] The buffer strip 7 can be made of soft materials such as silicone or rubber. The buffer strip 7 serves to block the adhesive structure 6 and also provides cushioning when the inner part 3 is close to the battery cell 2. Furthermore, the buffer strip 7 can locally prevent burrs, sharp corners, or other sharp protrusions on the surface of the inner part 3 from piercing the battery cell 2.

[0064] Furthermore, the thickness of the buffer strip 7 in the direction perpendicular to the base is less than the thickness of the inner side 3 in the direction perpendicular to the base, so as to avoid the buffer strip 7 being too thick and taking up too much space.

[0065] like Figures 1-3 As shown, in some embodiments of this disclosure, a cavity 101 may be provided inside the inner side portion 3. The cavity 101 may extend along the second direction and penetrate the inner side portion 3. Meanwhile, in order to ensure strength, at least one support rib 102 may be provided inside the cavity 101. The support rib 102 may divide the cavity 101 into multiple spaces. Thus, while ensuring strength, the weight may be reduced, and the energy may be absorbed by its own deformation when subjected to impact, thereby achieving buffering.

[0066] Furthermore, the main body 4 and the outer side 5 may also be provided with cavities 101 extending along the second direction, and at least one support rib 102 may be provided in the cavity 101. While ensuring strength, the weight is reduced, and the ribs can absorb energy by deforming themselves when subjected to impact, thus achieving buffering.

[0067] Furthermore, if there are multiple supporting ribs 102 in the same cavity 101, the different supporting ribs 102 can be parallel or at a certain angle to support the inner wall of the cavity 101 from different angles.

[0068] The embodiments of the present disclosure also provide a vehicle, which can include a vehicle body and the battery pack of any of the above embodiments. The vehicle body can include the side beam 10, which can be connected with the outer side portion 5 to connect the battery pack with the vehicle body. The vehicle has all the beneficial effects of the above battery pack. Among them, the vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile, etc., and the embodiments of the present application do not specially limit the above vehicle.

[0069] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present disclosure cover any and all variations of the present disclosure that come within the scope of the following claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body comprising a base and a frame arranged on the base, the frame comprising a side beam; a battery cell arranged on the base and located within a range surrounded by the frame; the side beam comprises an inner side portion, a main body portion and an outer side portion connected in sequence in a direction away from the battery cell, at least a part of a surface of the inner side portion close to the battery cell is a curved surface region curved towards the battery cell; a boundary of the curved surface region away from the base is connected with the main body portion.

2. The battery pack of claim 1, wherein, the inner side portion is located on a side close to the base at one end of the battery cell away from the base; the surface of the inner side portion close to the battery cell further comprises a planar region; one end of the curved surface region is connected with the main body portion, and the other end is smoothly connected with the planar region; the planar region is perpendicular to the base.

3. The battery pack of claim 1, wherein, the outer side portion extends in a direction parallel to the base; a normal projection of the outer side portion on the main body portion is located within a normal projection of the curved surface region on the main body portion.

4. The battery pack of claim 3, wherein, a boundary of the curved surface region close to the base is located on a side of the outer side portion close to the base.

5. The battery pack of claim 1, wherein, the side beam further comprises: a support portion arranged on a side of the main body portion away from the battery cell and located on a side of the outer side portion close to the base; the outer side portion and the main body portion are connected through the support portion; a boundary of the curved surface region away from the base is located on a side of the support portion away from the base, and a boundary of the curved surface region close to the base is located between a boundary of the support portion close to the base and a boundary of the support portion away from the base.

6. The battery pack of claim 1, wherein, the battery cell and the inner side portion are arranged on the base, and the main body portion is at least partially arranged on the base; the battery pack further comprises an adhesive structure, the battery cell is adhered to the base through the adhesive structure, and the adhesive structure is partially located between the inner side portion and the battery cell.

7. The battery pack of claim 6, wherein, the battery pack further comprises: a buffer strip arranged on the base and located between the inner side portion and the adhesive structure.

8. The battery pack of claim 7, wherein, a thickness of the buffer strip in a direction perpendicular to the base is less than a thickness of the inner side portion.

9. The battery pack of any one of claims 1-8, wherein, the inner side portion has a cavity, and at least one support rib plate is arranged in the cavity.

10. A vehicle characterized by comprising: a vehicle body and the battery pack according to any one of claims 1-9; the vehicle body is connected with the outer side portion.

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