Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a bottom plate, a frame body and an expansion cross beam, the frame body is connected to the bottom plate, the frame body comprises side edge beams which are oppositely arranged, each side edge beam is provided with a hollow cavity, each side edge beam comprises an inner beam body and an outer beam body which are connected, a first reinforcing part is arranged in each outer beam body, and each inner beam body is provided with a second reinforcing part; the expansion cross beam is located between the two side beams, a hollow cavity is formed in the expansion cross beam, a third reinforcing part is arranged in the expansion cross beam, and a mounting space for mounting a battery cell is formed among the expansion cross beam, the frame body and the bottom plate. According to the battery pack disclosed by the utility model, the weight of the side beams and the expansion cross beams is reduced, the strength of the battery pack can be enhanced, and a better side collision resisting effect of the battery pack is realized.

Description

Technical Field

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

[0002] CTP (Cell To Pack) technology has become the future development trend because it can significantly improve the energy density of the battery pack and save the cost of the battery pack. The CTP technology battery pack directly integrates a plurality of battery cell monomers into the battery pack. Through the removal of the module, the space utilization rate of the battery pack is greatly improved, but at the same time, higher requirements are also put forward for the collision safety of the battery pack.

[0003] Compared with the traditional battery pack, the number of transverse and longitudinal beams inside the CTP battery pack is less, which is not conducive to the safety of the battery pack during collision and extrusion. The existing battery pack boxes mostly use steel or aluminum. By increasing the thickness, the structural strength of the battery pack can be improved, and the extrusion resistance of the battery pack can be improved to a certain extent, but it is not conducive to the lightweight of the battery pack. And for some lightweight battery packs, their strength needs to be improved. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a battery pack, which can reduce the weight of the side beams and the expansion cross beam while strengthening the strength of the battery pack, so as to achieve a better effect of resisting side collision of the battery pack.

[0005] The battery pack according to the embodiment of the utility model includes: a bottom plate; a frame body, the frame body is connected to the bottom plate, the frame body includes opposite side beams, the side beams are provided with hollow cavities, and the side beams include connected inner beam bodies and outer beam bodies. A first reinforcing part is arranged inside the outer beam body, and a second reinforcing part is arranged inside the inner beam body; an expansion cross beam, the expansion cross beam is located between the two side beams, the expansion cross beam is provided with a hollow cavity, and a third reinforcing part is arranged inside the expansion cross beam. An installation space for installing battery cells is formed between the expansion cross beam, the frame body and the bottom plate.

[0006] According to the battery pack of the embodiment of the utility model, the side beam is set to include an inner beam body and an outer beam body, the inner beam body is provided with a second reinforcing part, and the outer beam body is provided with a first reinforcing part. The strength of the side beam can be improved through the first reinforcing part and the second reinforcing part. At the same time, the side beam is provided with a hollow cavity, which can reduce the weight of the side beam. The expansion cross beam is provided with a third reinforcing part, which can improve the strength of the expansion cross beam. Thus, the strength of the overall frame body is improved, and the effect of the battery pack resisting side collision is improved.

[0007] For the battery pack according to an embodiment of the present utility model, the inner beam body and the outer beam body are connected by a transition beam body. The second reinforcing portion includes a first diagonal reinforcing rib and a second diagonal reinforcing rib connected to each other. The first diagonal reinforcing rib and the second diagonal reinforcing rib form an included angle. The transition beam body includes a top plate, and the top plate is opposite to one end of the first diagonal reinforcing rib along the inner and outer directions of the frame body.

[0008] For the battery pack according to an embodiment of the present utility model, the second reinforcing portion further includes a second reinforcing rib arranged horizontally. The second reinforcing rib and the first diagonal reinforcing rib are spaced apart from each other along the up and down directions of the frame body, and both ends of the first diagonal reinforcing rib and the second reinforcing rib are connected to the inner wall of the inner beam body.

[0009] For the battery pack according to an embodiment of the present utility model, the first reinforcing portion includes at least one first reinforcing rib arranged horizontally, and the first reinforcing rib is staggered with the second reinforcing rib and the first diagonal reinforcing rib along the up and down directions.

[0010] For the battery pack according to an embodiment of the present utility model, the expansion cross beam includes a cross beam frame, and the third reinforcing portion includes a plurality of third reinforcing ribs. A honeycomb structure is formed between the cross beam frame and the plurality of third reinforcing ribs.

[0011] For the battery pack according to an embodiment of the present utility model, one of the plurality of third reinforcing ribs is a middle reinforcing rib, and the other plurality of third reinforcing ribs are edge reinforcing ribs. One end of each edge reinforcing rib is connected to the middle reinforcing rib and the other end is obliquely connected to the cross beam frame.

[0012] For the battery pack according to an embodiment of the present utility model, transition plates are provided on both sides of the connection between the expansion cross beam and the side beam. The transition plates are connected to the side beam and extend to be connected to the expansion cross beam.

[0013] For the battery pack according to an embodiment of the present utility model, there are a plurality of expansion cross beams, and the plurality of expansion cross beams are spaced apart from each other along the length direction of the side beam.

[0014] For the battery pack according to an embodiment of the present utility model, the frame body includes two opposite end beam bodies. The two end beam bodies are respectively connected to both ends of the side beam, and a reinforcing beam is provided between at least one of the two end beam bodies and the adjacent expansion cross beam.

[0015] For the battery pack according to an embodiment of the present utility model, it further includes an upper cover. The battery cells are located in the installation space, and the upper cover is connected to the frame body.

[0016] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0017] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram of the connection structure between the frame and the bottom plate of the battery pack according to an embodiment of the present utility model;

[0019] Figure 2 is a schematic diagram of the partial connection structure between the expansion crossbeam and the frame according to an embodiment of the present utility model;

[0020] Figure 3 is a partial structure schematic diagram of the expansion crossbeam according to an embodiment of the present utility model;

[0021] Figure 4 is a partial schematic diagram of the side beam according to an embodiment of the present utility model;

[0022] Figure 5 is a schematic diagram of the structure of an embodiment of the battery pack frame according to an embodiment of the present utility model;

[0023] Figure 6 is an embodiment of the present utility model Figure 5 partial enlarged schematic diagram;

[0024] Figure 7 is an exploded view of the battery pack according to an embodiment of the present utility model.

[0025] Reference Signs:

[0026] Battery pack 100,

[0027] Frame 1, end beam body 11, side beam 12, inner beam body 121, transition beam 122, outer beam body 123, first strengthening part 1231, mounting hole 1232, second strengthening part 124, second strengthening rib 1241, first diagonal strengthening rib 1242, second diagonal strengthening rib 1243, bottom plate 2, expansion crossbeam 3, third strengthening part 31, middle strengthening rib 311, edge strengthening rib 312, transition plate 4, connecting sub-plate 41, strengthening sub-plate 42, strengthening beam 5, longitudinal beam 6, battery cell 7, upper cover 8. Detailed Embodiments

[0028] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0029] Reference is made below Figures 1 - 7 to describe the battery pack 100 according to an embodiment of the present utility model. The side beam 12 is provided to include an inner beam body 121 and an outer beam body 123. The inner beam body 121 is provided with a second strengthening portion 124, and a first strengthening portion 1231 is provided inside the outer beam body 123. The strength of the side beam 12 can be improved through the first strengthening portion 1231 and the second strengthening portion 124. At the same time, the side beam 12 is provided with a hollow cavity, which can reduce the weight of the side beam 12. A third strengthening portion 31 is provided inside the expansion cross beam 3, which can improve the strength of the expansion cross beam 3. Thus, the strength of the overall frame 1 is improved, thereby enhancing the effect of the battery pack 100 in resisting side impacts.

[0030] As Figures 1 - 7 shown, the battery pack 100 according to an embodiment of the present utility model includes: a bottom plate 2, a frame 1, and an expansion cross beam 3.

[0031] Among them, the frame 1 is connected to the bottom plate 2. The frame 1 includes opposite side beams 12. The side beams 12 are provided with hollow cavities, and the side beams 12 include connected inner beam bodies 121 and outer beam bodies 123. A first strengthening portion 1231 is provided inside the outer beam body 123, and a second strengthening portion 124 is provided on the inner beam body 121; the expansion cross beam 3 is located between the two side beams 12. The expansion cross beam 3 is provided with a hollow cavity, and a third strengthening portion 31 is provided inside the expansion cross beam 3. An installation space for installing the battery cells 7 is formed between the expansion cross beam 3, the frame 1, and the bottom plate 2.

[0032] In practice, the frame 1 and the bottom plate 2 of the battery pack 100 form the main structure for supporting the battery cells 7. The side beams 12 of the frame 1 include an inner beam body 121 and an outer beam body 123. By providing the outer beam body 123, when the frame 1 of the battery pack 100 is impacted, the acting force first acts on the outer beam body 123 and is then transmitted to the inner beam body 121 through the outer beam body 123, so that the side beam 12 has the effect of resisting impact; an expansion cross beam 3 is provided between the two side beams 12 of the frame 1. The expansion cross beam 3 can be multiple or one. The number of expansion cross beams 3 is set according to the size of the battery pack 100. When the side beam 12 is subjected to the acting force of impact, the acting force can be dispersed and transmitted to the expansion cross beam 3, thereby reducing the deformation of the side beam 12.

[0033] Specifically, the side beam 12 includes a hollow cavity inside. The setting of the hollow cavity can reduce the weight of the side beam 12. Both the inner beam body 121 and the outer beam body 123 of the side beam 12 can be hollow cavities, so as to reduce the weight of the inner beam body 121 and the outer beam body 123 as a whole, that is, reduce the weight of the side beam 12. The expansion cross beam 3 is located between the two side beams 12 and is used to enhance the strength of the frame 1. The expansion cross beam 3 is provided with a hollow cavity inside, which can also reduce the weight of the expansion cross beam 3. That is, the weights of both the expansion cross beam 3 and the side beam 12 are reduced, thereby reducing the weight of the entire frame 1.

[0034] Further, when the vehicle is subjected to a side collision, the force-bearing area of the side collision is small and the force is relatively concentrated. Usually, when the battery pack 100 undergoes a side pole collision, the side beam 12 of the battery pack 100 needs to bear most of the forces. For example, when conducting a side pole collision experiment on the whole vehicle, the position of the battery pack 100 of the vehicle where the expansion cross beam 3 is provided overlaps or coincides with the side pole outside the vehicle, that is, the position where the expansion cross beam 3 is provided collides with the side pole outside the vehicle. The force is transmitted from the sill beam of the vehicle to the side beam 12 of the battery pack 100, and the side beam 12 is squeezed. At this time, the position of the expansion cross beam 3 overlaps with the side pole collision position, which can make the force be transmitted from the side beam 12 to the expansion cross beam 3 more quickly, provide strong support for the side beam 12, and bear part of the force, greatly alleviating the deformation of the side beam 12, thereby protecting the internal battery cells 7 from being squeezed.

[0035] Specifically, the acting force first passes through the outer beam body 123 and is dispersed along the first strengthening part 1231 inside the outer beam body 123. That is, the first strengthening part 1231 has a strengthening effect on the outer beam body 123 to improve the strength of the outer beam body 123. At the same time, the second strengthening part 124 of the inner beam body 121 can also improve the strength of the inner beam body 121. And when the acting force is transmitted from the outer beam body 123 to the inner beam body 121, the acting force can also be dispersed through the first strengthening part 1231, the second strengthening part 124, etc. And when the acting force is transmitted to the expansion cross beam 3, the third strengthening part 31 inside the expansion cross beam 3 can also better resist the external acting force.

[0036] Thus, the battery pack 100 of the embodiment of the present utility model can not only reduce the weight of the side beam 12 and the expansion cross beam 3, but also enhance the strength of the frame 1, achieving a better effect of resisting side collisions for the battery pack 100.

[0037] In some embodiments, the inner beam body 121 and the outer beam body 123 are connected by a transition beam 122. The second strengthening part 124 includes a first diagonal strengthening rib 1242 and a second diagonal strengthening rib 1243 connected to each other. The first diagonal strengthening rib 1242 and the second diagonal strengthening rib 1243 have an included angle. The transition beam 122 includes a top plate, and the top plate is opposite to one end of the first diagonal strengthening rib 1242 along the inner and outer directions of the frame 1.

[0038] In practice, the outer beam body 123 and the transition beam 122 function together to bear force, deform, absorb energy, and transfer loads. The inner beam body 121 plays a major role in bearing and transmitting forces. When the first diagonal reinforcing rib 1242 is provided in the second reinforcing portion 124, and one end of the first diagonal reinforcing rib 1242 is opposite to the top plate of the transition beam 122 in the inner-outer direction of the frame body 1, the acting force is transmitted along the top surface of the transition beam 122 towards the first diagonal reinforcing rib 1242 of the inner beam body 121, improving the anti-collapse performance of the side beam 12. Moreover, compared with the arrangement of horizontal ribs, the arrangement of the first diagonal reinforcing rib 1242 and the second diagonal reinforcing rib 1243 can have a longer force transmission path when being squeezed, and the first diagonal reinforcing rib 1242 and the second diagonal reinforcing rib 1243 are connected and have an included angle, enabling mutual support between the first diagonal reinforcing rib 1242 and the second diagonal reinforcing rib 1243, thereby making the structure of the inner beam body 121 more stable.

[0039] In addition, referring to Figure 4 As shown, the transition beam 122 in the embodiment of the present utility model has an arc-shaped design. For example, the top plate of the transition beam 122 is arranged in an arc shape from the inside to the outside, and is opposite to the first diagonal reinforcing rib 1242, improving the buffering acting force during collision.

[0040] In some embodiments, the second reinforcing portion 124 further includes a second reinforcing rib 1241 arranged horizontally. The second reinforcing rib 1241 and the first diagonal reinforcing rib 1242 are spaced apart in the up-down direction of the frame body 1, and both ends of the first diagonal reinforcing rib 1242 and the second reinforcing rib 1241 are connected to the inner wall of the inner beam body 121.

[0041] In practice, by providing the second reinforcing rib 1241, the first diagonal reinforcing rib 1242, and the second diagonal reinforcing rib 1243 in the inner beam body 121, and connecting the first diagonal reinforcing rib 1242 and the second diagonal reinforcing rib 1243, and spacing the second reinforcing rib 1241 from the first diagonal reinforcing rib 1242 and spacing it from the second diagonal reinforcing rib 1243, the strength of the inner beam body 121 can be improved while reducing the weight of the inner beam body 121.

[0042] Referring to Figure 4As shown, both the first diagonal reinforcing rib 1242 and the second diagonal reinforcing rib 1243 are located below the second reinforcing rib 1241. Both ends of the first diagonal reinforcing rib 1242 are connected to the inner wall of the inner beam body 121. One end of the second diagonal reinforcing rib 1243 is connected to the middle of the first diagonal reinforcing rib 1242 and the other end is connected to the inner wall of the inner beam body 121. And the first diagonal reinforcing rib 1242 faces the top plate of the transition beam 122, and the upper surfaces of the transition beam 122 and the outer beam body 123 are flush. That is, when the outer beam body 123 is subjected to a collision force, the force is transmitted from the outer beam body 123 to the transition beam 122, and through the transition beam 122 to the positions of the first diagonal reinforcing rib 1242 and the second diagonal reinforcing rib 1243 of the inner beam body 121. That is, the strength of the relative positions of the inner beam body 121, the outer beam body 123, and the transition beam 122 is improved, thereby improving the resistance to the collision force from the outer beam body 123.

[0043] In some embodiments, the first reinforcing portion 1231 includes at least one first reinforcing rib disposed horizontally, and the first reinforcing rib is staggered from the second reinforcing rib 1241 and the first diagonal reinforcing rib 1242 in the up and down directions.

[0044] In practice, the first reinforcing rib of the outer beam body 123 extends in the inside-outside direction of the frame 1, improving the effect of the outer beam body 123 resisting side collisions. For example, when the side collision force is transmitted from the outside to the inside of the frame 1, and the first reinforcing rib extends in the inside-outside direction, the collision force can be transmitted from the outer surface of the outer beam body 123 to the first reinforcing rib to disperse the collision force, thereby improving the effect of the outer beam body 123 resisting deformation.

[0045] Refer to Figure 4 As shown, the first reinforcing rib of the outer beam body 123, the second reinforcing rib 1241 of the inner beam body 121, and the first diagonal reinforcing rib 1242 are all spaced apart in the up and down direction of the frame 1, which can improve the strength of the overall side beam 12. That is, the side beam 12 is strengthened at different positions of the outer beam body 123, the transition beam 122, and the inner beam body 121, and the strengthened positions are distributed in the up and down direction, thereby improving the anti-deformation effect of the overall side beam 12.

[0046] Moreover, the outer beam body 123 is further provided with mounting holes 1232. The frame 1 is connected to the vehicle by bolts or other connecting members passing through the mounting holes 1232, that is, the battery pack 100 is connected to the vehicle, so that the battery pack 100 is detachable relative to the vehicle. And the first reinforcing rib extends along the length direction of the side beam 12. Thus, after the mounting holes 1232 penetrating through the outer beam body 123 are provided, the strength of the entire side beam 12 can still be ensured.

[0047] In some embodiments, the expansion crossbeam 3 includes a crossbeam frame, and the third strengthening portion 31 includes a plurality of third strengthening ribs, and a honeycomb structure is formed between the crossbeam frame and the plurality of third strengthening ribs.

[0048] That is to say, the interior of the crossbeam frame is a hollow cavity, and a plurality of third strengthening ribs are provided in the hollow cavity. When the plurality of third strengthening ribs are connected to each other and connected to the inner wall of the crossbeam frame, a honeycomb structure is formed. When the expansion crossbeam 3 is subjected to an external force, the force transmission path of the honeycomb structure is longer, and the buffering effect of the honeycomb structure is stronger. It can make the expansion crossbeam 3 have high strength and good buffering effect while having relatively light weight, simple process, achieving the balance of weight reduction and performance, and playing a positive role in weight reduction and energy density improvement.

[0049] It should be noted that the above-mentioned first strengthening rib, second strengthening rib 1241, third strengthening rib, etc. all extend along the length direction of the side beam 12 of the frame body 1. That is, from the perspective of the cross-section, they are strengthening ribs, and each strengthening rib extends along the length direction to form a strengthening plate structure, thereby improving the strength of the entire side beam 12 along the length direction.

[0050] In some embodiments, one of the plurality of third strengthening ribs is a middle strengthening rib 311, and the other plurality of third strengthening ribs are edge strengthening ribs 312. One end of each edge strengthening rib 312 is connected to the middle strengthening rib 311 and the other end is obliquely connected to the crossbeam frame.

[0051] That is to say, the middle strengthening rib 311 is located in the middle of the expansion crossbeam 3 and is not connected to the inner wall of the crossbeam frame. One end of each of the other edge strengthening ribs 312 is connected to one end of the middle strengthening rib 311 and the other end is connected to the inner wall of the crossbeam frame, so that at least two edge strengthening ribs 312 are connected to the inner wall of the crossbeam frame and form one of the honeycomb holes of the honeycomb structure. Thus, by providing a plurality of third strengthening ribs, a better strengthening effect can be achieved on the crossbeam frame, and at the same time, the weight of the crossbeam frame is relatively light.

[0052] Refer to Figure 3 As shown, there are a total of five third strengthening ribs. The middle strengthening rib 311 is located in the middle and is parallel to the upper and lower walls of the crossbeam frame. Each end of the middle strengthening rib 311 is connected to two edge strengthening ribs 312, and the two edge strengthening ribs 312 at the same end are inclined in opposite directions. Thus, a triangle is formed between the two edge strengthening ribs 312 at the same end and the inner wall of the crossbeam frame, and the triangular area formed by the plurality of third strengthening ribs has a more stable structure and a stronger buffering effect.

[0053] In some embodiments, transition plates 4 are provided on both sides of the connection between the expansion crossbeam 3 and the side beam 12. The transition plates 4 are connected to the side beam 12 and extend to be connected to the expansion crossbeam 3.

[0054] Among them, a transition plate 4 is provided at the connection between the expansion cross beam 3 and the side beam 12, which can improve the strength of the connection between the expansion cross beam 3 and the side beam 12. The setting of the transition plate 4 increases the force-bearing area of the battery pack 100, can effectively reduce stress concentration, and improve the connection strength generated at the transition position between the expansion cross beam 3 and the side beam 12, thereby improving the structural strength and reliability of the battery pack 100. The transition plate 4 can be considered whether to be added according to the specific requirements for the structure of the battery pack 100.

[0055] Referring to Figure 2 As shown, the transition plate 4 includes a connecting sub-plate 41 and a reinforcing sub-plate 42. One end of the connecting sub-plate 41 is connected to one side of the expansion cross beam 3, and the connecting sub-plate 41 is parallelly attached to the side beam 12 and connected by bolts. The connecting sub-plate 41 is vertically connected with the reinforcing sub-plate 42, and one end of the reinforcing sub-plate 42 is connected to one side of the expansion cross beam 3, thereby improving the reliability and stability of the connection between the transition plate 4 and the expansion cross beam 3.

[0056] In some embodiments, there are multiple expansion cross beams 3, and the multiple expansion cross beams 3 are spaced apart along the length direction of the side beam 12.

[0057] Among them, by setting multiple expansion cross beams 3, an installation space formed between adjacent expansion cross beams 3 and the bottom plate 2 can be used to install the battery cells 7. The number of expansion cross beams 3 can be set appropriately according to the size of the battery pack 100, which can not only ensure the strength requirements of the frame 1 but also meet the lightweight requirements of the frame 1.

[0058] Referring to Figure 5 As shown, there are three expansion cross beams 3, and longitudinal beams 6 are cross-connected to all three expansion cross beams 3. The longitudinal beams 6 are located between the two side beams 12 and are parallel to the side beams 12. That is, at this time, a small installation space is formed between adjacent expansion cross beams 3 and the longitudinal beams 6 for installing the battery cells 7, and the relationship between the three expansion cross beams 3 and the longitudinal beams 6 can improve the overall strength of the frame 1.

[0059] When the side beam 12 is subjected to a collision force, the force can be dispersed along the side beam 12 and transmitted to the multiple expansion cross beams 3, and the collision force can also be transmitted to the longitudinal beams 6 along the intersections of the multiple expansion cross beams 3 and the longitudinal beams 6, so that the collision force is gradually dispersed in different directions, improving the ability of the entire frame 1 to resist deformation.

[0060] In some embodiments, the frame 1 includes two opposite end beam bodies 11, the two end beam bodies 11 are respectively connected to the two ends of the side beam 12, and at least one of the two end beam bodies 11 is provided with a reinforcing beam 5 between it and the adjacent expansion cross beam 3.

[0061] In practice, the two end beams 11 face each other, and the two side beams 12 face each other. The end beam 11 is connected to the side beam 12. A reinforcing beam 5 is provided between at least one of the two end beams 11 and the adjacent expansion cross beam 3, which can ensure that one end of the end beam 11 has sufficient strength to resist external collisions when subjected to a collision force.

[0062] Referring to Figure 5 as shown, Figure 5 is an embodiment in which the frame body 1 is provided with an expansion cross beam 3 and a side beam 12, including three expansion cross beams 3. The three expansion cross beams 3 are parallel and spaced apart. A plurality of reinforcing beams 5 are provided between one end beam 11 and one expansion cross beam 3, while no reinforcing beam 5 is provided between the other end beam 11 and the other expansion cross beam 3. When placing the battery pack 100, for example, the end without the reinforcing beam 5 can be placed on the side that is not easily collided. If the end without the reinforcing beam 5 is the front end beam 11 and the end with the reinforcing beam 5 is the rear end beam 11, it can make the side beam 12 and the rear end beam 11 have a better effect of resisting collisions and provide better protection for the frame body 1.

[0063] Specifically, when the rear end beam 11 is subjected to an external extrusion force, the force can be transmitted to the expansion cross beam 3 through the reinforcing beam 5, avoiding the rear end beam 11 from being crushed and improving the extrusion strength of the battery pack 100 in the front-rear direction. Especially when the distance between the rear end beam 11 and the expansion cross beam 3 is relatively far, the simple rear end beam 11 cannot withstand the extrusion force in the front-rear direction and needs to increase the wall thickness or the beam width to improve its strength, but this often increases the weight significantly, violating the lightweight design requirements. By adding a short reinforcing beam 5 between the rear end beam 11 and the expansion cross beam 3, these two performances can be better balanced.

[0064] In some embodiments, the battery pack 100 further includes an upper cover 8. The battery cells 7 are located in the installation space, and the upper cover 8 is connected to the frame body 1.

[0065] In practice, the battery cells 7 are installed in the frame body 1 of the battery pack 100. After the battery cells 7 are installed in the frame body 1, the upper cover 8 can be connected to the frame body 1 to protect the battery cells 7, and the upper cover 8 is detachably connected to the battery cells 7. The detachable upper cover 8 is convenient for repairing and replacing the battery cells 7.

[0066] 1. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0067] 2. In the description of the present utility model, "the first feature" and "the second feature" may include one or more of such features.

[0068] 3. In the description of the present utility model, the meaning of "a plurality of" is two or more.

[0069] 4. In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0070] 5. In the description of the present utility model, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0071] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0072] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, Comprising: Bottom plate; Frame body, the frame body is connected to the bottom plate, the frame body includes side beams arranged oppositely, the side beams are provided with hollow cavities, and the side beams include connected inner beam bodies and outer beam bodies, the outer beam bodies are provided with first strengthening parts, and the inner beam bodies are provided with second strengthening parts; Expansion cross beam, the expansion cross beam is located between the two side beams, the expansion cross beam is provided with a hollow cavity, and the expansion cross beam is provided with a third strengthening part, and an installation space for installing an electric core is formed between the expansion cross beam, the frame body and the bottom plate.

2. The battery pack according to claim 1, wherein, The inner beam body and the outer beam body are connected by a transition beam body, the second strengthening part includes a connected first diagonal strengthening rib and a second diagonal strengthening rib, the first diagonal strengthening rib and the second diagonal strengthening rib have an included angle, and the transition beam body includes a top plate, and the top plate is opposite to one end of the first diagonal strengthening rib along the inner and outer directions of the frame body.

3. The battery pack according to claim 2, characterized in that, The second strengthening part further includes a horizontally arranged second strengthening rib, the second strengthening rib and the first diagonal strengthening rib are spaced apart along the up and down directions of the frame body, and both ends of the first diagonal strengthening rib and the second strengthening rib are connected to the inner wall of the inner beam body.

4. The battery pack according to claim 3, wherein, The first strengthening part includes at least one horizontally arranged first strengthening rib, and the first strengthening rib is staggered with the second strengthening rib and the first diagonal strengthening rib along the up and down directions.

5. The battery pack according to claim 1, wherein The expansion cross beam includes a cross beam frame, the third strengthening part includes a plurality of third strengthening ribs, and a honeycomb structure is formed between the cross beam frame and the plurality of third strengthening ribs.

6. The battery pack according to claim 5, characterized in that, One of the plurality of third strengthening ribs is a middle strengthening rib, and the other plurality of third strengthening ribs are edge strengthening ribs, and one end of each edge strengthening rib is connected to the middle strengthening rib and the other end is obliquely connected to the cross beam frame.

7. The battery pack according to claim 1, characterized in that Both sides of the connection between the expansion cross beam and the side beam are provided with transition plates, the transition plates are connected to the side beam and extend to be connected to the expansion cross beam.

8. The battery pack according to claim 1, characterized in that, There are a plurality of the expansion cross beams, and the plurality of expansion cross beams are spaced apart along the length direction of the side beam.

9. The battery pack according to claim 8, wherein The frame body includes two opposite end beam bodies, the two end beam bodies are respectively connected to both ends of the side beam, and at least one of the two end beam bodies is provided with a strengthening beam between it and the adjacent expansion cross beam.

10. The battery pack according to claim 1, wherein It further includes an upper cover, the electric core is located in the installation space, and the upper cover is connected to the frame body.

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