A method for simulating the extrusion resistance of an anti-extrusion battery pack, a vehicle, and a battery pack

Abstract

The present invention relates to an anti-extrusion battery pack, comprising an upper box, a battery module and a lower box, wherein the upper box is a cavity structure with an opening at the lower end, and the lower box is a cavity structure with an opening at the upper end, and the lower edge of the upper box and the upper edge of the lower box are spliced ​​together to form an internal hollow box structure, and the battery module is fixed in the box structure; the two inner side walls of the lower box are respectively provided with reinforcing side ribs in parallel, and the two outer side walls of the lower box are respectively symmetrically provided with a plurality of groups of hanging ear structures, each group of hanging ear structures includes two hanging ear pieces, and reinforcing transverse ribs are respectively provided between the two hanging ear pieces of each group of hanging ear structures, and the two ends of each reinforcing transverse rib rest on the two reinforcing side ribs, and the two ends of each reinforcing transverse rib are respectively opposite to the two hanging ear pieces of each group of hanging ear structures. The anti-extrusion battery pack of the present invention improves its anti-extrusion performance, reduces the risk of the battery pack being squeezed and broken, and thereby improves the safety performance of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile batteries, and in particular to an anti-extrusion battery pack, an automobile, and a method for simulating the extrusion resistance of the battery pack. Background Art

[0002] As an emerging vehicle industry, new energy vehicles have been widely promoted around the world. Their technology and market are becoming increasingly mature and stable. Consumers have put forward higher requirements on the safety performance, endurance performance and other aspects of new energy vehicles.

[0003] Among them, the battery pack, as the heart of new energy vehicles, is one of the power sources for hybrid and pure electric vehicles, and plays a vital role in safety performance, endurance performance, etc.; and the battery pack's anti-extrusion performance is an important assessment content of safety performance.

[0004] Existing battery packs generally only barely meet the standard requirements for compression resistance. This poses a risk of rupture, fire, or explosion when subjected to strong lateral compression during vehicle operation. Furthermore, during the battery pack design process, R&D personnel must conduct extensive experiments to optimize the structural process, which consumes significant manpower and resources, making compression testing of battery packs expensive. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide an anti-extrusion battery pack, which improves the anti-extrusion performance of the battery pack, thereby reducing the risk of the battery pack being squeezed and improving the safety performance of the battery pack.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A compression-resistant battery pack comprises an upper box body, a battery module and a lower box body, wherein the upper box body is a cavity structure with an opening at the lower end, and the lower box body is a cavity structure with an opening at the upper end, and the lower end edge of the upper box body and the upper end edge of the lower box body are spliced ​​together to form an internal hollow box structure, and the battery module is fixed in the box body structure; the two inner side walls of the lower box body are respectively provided with reinforcing side ribs in parallel, and the two outer side walls of the lower box body are respectively symmetrically provided with a plurality of lifting ear structures, each group of lifting ear structures includes two lifting ear pieces, and a reinforcing transverse rib is respectively provided between the two lifting ear pieces of each group of lifting ear structures, the two ends of each reinforcing transverse rib are respectively abutted against the two reinforcing side ribs, and the two ends of each reinforcing transverse rib are respectively opposite to the two lifting ear pieces of each group of lifting ear structures.

[0008] As an embodiment, the two reinforcing side ribs each include a primary right-angle plate and a secondary right-angle plate, and the primary right-angle plate of each reinforcing side rib is connected to the secondary right-angle plate to form a stepped structure; the two inner side walls of the lower box body are respectively provided with right-angle bosses, and the outer side walls of the two reinforcing side ribs are respectively fitted and abutted against the right-angle bosses of the two inner side walls of the lower box body.

[0009] As an embodiment, the two reinforcing side ribs are respectively provided with a plurality of first through holes, and the two reinforcing side ribs are respectively passed through their respective first through holes by a plurality of bolts and fixed on the right-angle bosses of the two inner side walls of the lower box body.

[0010] As an embodiment, right-angle side panels are fixed to the two outer side walls of the lower box body respectively, and the two hanging ear members of each set of hanging ear structures are symmetrically arranged on the two right-angle side panels respectively.

[0011] As an embodiment, three groups of ear structures are respectively provided on the two right-angled side panels of the lower box body, and the three groups of ear structures are equally spaced on the two right-angled side panels; three reinforcing transverse ribs are respectively provided in parallel on the inner bottom of the lower box body, and the two ends of the three reinforcing transverse ribs are respectively against the two reinforcing side ribs, and the two ends of the three reinforcing transverse ribs are respectively opposite to the two ear pieces of the three groups of ear structures.

[0012] As an embodiment, each of the ear pieces includes an upper ear and a lower ear, the lower surface of the upper ear of each ear piece is in contact with the upper surface of the lower ear, and a right-angle mounting seat is provided on the side of the upper ear of each ear piece close to the two right-angle side panels, so that the upper ear of each ear piece is fixed to the two right-angle side panels through its own right-angle mounting seat.

[0013] As an embodiment, the three reinforcing transverse ribs are all long strip structures, and the bottom of each reinforcing transverse rib rests on the inner bottom of the lower box body; and the bottom of each reinforcing transverse rib is horizontally extended to both sides with mounting side plates, and the two mounting side plates of each reinforcing transverse rib are respectively fixed to the inner bottom of the lower box body by bolts.

[0014] As an embodiment, a battery mounting seat is provided at the inner bottom of the lower box, and the battery module is fixed on the battery mounting seat.

[0015] Correspondingly, the present invention also provides an automobile, comprising the anti-extrusion battery pack as described in any one of the above items.

[0016] Therefore, the anti-extrusion battery pack described in the present invention is achieved by respectively arranging several groups of ear structures on the two outer sides of the lower box body, and correspondingly arranging reinforcing side ribs on the inner side walls of the lower box body, and respectively arranging reinforcing transverse ribs between each group of ear structures, and making the two ends of the reinforcing transverse ribs respectively rest on the two reinforcing side ribs, and the two ends of each reinforcing transverse rib are respectively opposite to the two ear pieces of each group of ear structures; in this way, the anti-extrusion performance of both sides of the lower box body is greatly enhanced, and when the lower box body is squeezed, the ear pieces on both sides can be deformed by force first, and the reinforcing side ribs and reinforcing transverse ribs inside the lower box body further improve the anti-extrusion ability of the ear pieces, so that the anti-extrusion performance of the battery pack of the present invention is greatly improved, thereby improving the safety performance of the battery pack.

[0017] In addition, the present invention also provides a method for simulating the test of the anti-extrusion performance of a battery pack, comprising the following steps:

[0018] S1, constructing a battery pack simulation model according to the parameters of the anti-extrusion battery pack as described above;

[0019] S2: Construct a test site model based on the anti-extrusion performance test site. The test site model includes extrusion columns, ground, and extrusion walls. Combine this with the battery pack simulation model in S1 to build a model scene for the extrusion experiment.

[0020] S3: After the ground and the extrusion wall in S2 are set perpendicular to each other, the battery pack simulation model is placed flat on the ground with the side with the hanging ear against the extrusion wall. Based on actual test conditions, the extrusion column is controlled to squeeze one of the hanging ears on the other side of the battery pack simulation model, causing the battery pack simulation model to deform toward the extrusion wall.

[0021] S4, calculating in real time the extrusion force of the extrusion column on the hanging ear, the reaction force of the hanging ear on the extrusion column, and the deformation of the hanging ear relative to the battery pack simulation model, and tracking the reaction force curve of the extrusion column during the extrusion process;

[0022] S5, check the reaction force curve of the extrusion column, and obtain the deformation of the ear pieces on both sides of the battery pack simulation model in real time, and judge the flipping of the ear pieces on both sides of the battery pack simulation model; before the reverse extrusion force reaches 100kN, if the ear pieces on both sides of the battery pack simulation model are not completely flipped up, store the initial parameters of the battery pack simulation model; if the ear pieces on both sides of the battery pack simulation model are already completely flipped up, readjust the parameters of the battery pack simulation model until the ear pieces on both sides of the battery pack simulation model are not completely flipped up before the reverse extrusion force reaches 100kN.

[0023] Therefore, the present invention performs an extrusion simulation analysis on any of the above-mentioned anti-extrusion battery packs. According to the reaction force curve during the extrusion process and the stress and deformation of each component of the battery pack, the reasons for the weak positioning extrusion strength are analyzed and corresponding design optimization is performed to improve the anti-extrusion ability of the battery pack and ensure safe use.

[0024] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the anti-extrusion battery pack of the present invention;

[0026] Figure 2 This is a schematic structural diagram of the lower box of the anti-extrusion battery pack of the present invention;

[0027] Figure 3 This is an exploded schematic diagram of the anti-extrusion battery pack of the present invention;

[0028] Figure 4 This is a schematic structural diagram of the reinforced side ribs of the anti-extrusion battery pack of the present invention;

[0029] Figure 5 A schematic diagram of the connection between the right-angle side plate and the hanging ear member of the anti-extrusion battery pack of the present invention;

[0030] Figure 6 This is a schematic structural diagram of the lifting ear member of the anti-extrusion battery pack of the present invention;

[0031] Figure 7 This is an exploded schematic diagram of the lifting ear piece of the anti-extrusion battery pack of the present invention;

[0032] Figure 8 Schematic diagram of a scenario for a method for simulating the test of the anti-extrusion performance of a battery pack according to the present invention;

[0033] Figure 9 Flowchart of the steps of the method for simulating the test of the anti-extrusion property of a battery pack according to the present invention;

[0034] Figure 10 Schematic diagram of the curve of the extrusion reaction force of the anti-extrusion test method of the battery pack of the present invention. DETAILED DESCRIPTION

[0035] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] See also Figures 1 to 7 , Figure 1 This is a schematic structural diagram of the anti-extrusion battery pack of the present invention; Figure 2 This is a schematic structural diagram of the lower box of the anti-extrusion battery pack of the present invention; Figure 3 This is an exploded schematic diagram of the anti-extrusion battery pack of the present invention; Figure 4 This is a schematic structural diagram of the reinforced side ribs of the anti-extrusion battery pack of the present invention; Figure 5 A schematic diagram of the connection between the right-angle side plate and the hanging ear member of the anti-extrusion battery pack of the present invention; Figure 6 This is a schematic structural diagram of the lifting ear member of the anti-extrusion battery pack of the present invention; Figure 7 Schematic diagram of the exploded view of the lifting ear of the anti-extrusion battery pack of the present invention.

[0038] like Figures 1 to 3 As shown, this embodiment provides an anti-extrusion battery pack, including an upper box body 10, a battery module 30 and a lower box body 20, wherein the upper box body 10 is a cavity structure with an opening at the lower end, and the lower box body 20 is a cavity structure with an opening at the upper end, and the lower end edge of the upper box body 10 and the upper end edge of the lower box body 20 are spliced ​​with each other to form an internal hollow box structure, and the battery module 30 is fixed in the box structure; the two inner side walls of the lower box body 20 are respectively provided with reinforcing side ribs 40 in parallel, and the two outer side walls of the lower box body 20 are respectively symmetrically provided with a plurality of groups of ear structures, each group of ear structures includes two ear pieces 50, and a reinforcing transverse rib 60 is respectively provided between the two ear pieces 50 of each group of ear structures, and the two ends of each reinforcing transverse rib 60 respectively abut against the two reinforcing side ribs 40, and the two ends of each reinforcing transverse rib 60 are respectively opposite to the two ear pieces 50 of each group of ear structures.

[0039] Specifically, if Figure 4 As shown, the two reinforcing side ribs 40 each include a primary right-angle plate 41 and a secondary right-angle plate 42, and the primary right-angle plate 41 and the secondary right-angle plate 42 of each reinforcing side rib 40 are connected to form a stepped structure; the two inner side walls of the lower box body 20 are respectively provided with right-angle bosses, and the outer side walls of the two reinforcing side ribs 40 are respectively fitted and abutted against the right-angle bosses of the two inner side walls of the lower box body 20.

[0040] In this embodiment, the two reinforcing side ribs 40 are each provided with a plurality of first through-holes 43. Bolts are passed through each of the first through-holes 43 and secured to the right-angled bosses on the two inner side walls of the lower case 20. Furthermore, right-angled side panels 21 are secured to the two outer side walls of the lower case 20. The two lifting lugs 50 of each set of lifting lug structures are symmetrically disposed on the two right-angled side panels 21.

[0041] like Figure 5 As shown, as a preferred embodiment, three groups of ear structures are respectively provided on the two right-angled side panels 21 of the lower box body 20 of this embodiment, and the three groups of ear structures are respectively distributed at equal intervals on the two right-angled side panels 21; three reinforcing transverse ribs 60 are respectively provided in parallel on the inner bottom of the lower box body 20, and the two ends of the three reinforcing transverse ribs 60 respectively rest on the two reinforcing side ribs 40, and the two ends of the three reinforcing transverse ribs 60 respectively correspond to the two ear pieces 50 of the three groups of ear structures.

[0042] like Figure 6 and Figure 7 As shown, each of the hanging ear pieces 50 of this embodiment includes an upper hanging ear 51 and a lower hanging ear 52. The lower surface of the upper hanging ear 51 of each hanging ear piece 50 is in contact with the upper surface of the lower hanging ear 52, and a right-angle mounting seat 53 is provided on the side of the upper hanging ear 51 of each hanging ear piece 50 close to the two right-angle side panels 21, so that the upper hanging ear 51 of each hanging ear piece 50 is fixed to the two right-angle side panels 21 via its respective right-angle mounting seat 53. Furthermore, the two right-angle side panels 21 of this embodiment are fixed together with each of the hanging ear pieces 50 by bolts, and the two right-angle side panels 21 are also fixed to the outer wall of the lower box body 20 by bolts.

[0043] In this embodiment, the three reinforcing transverse ribs 60 are all long strip structures, and the bottom of each reinforcing transverse rib 60 rests on the inner bottom of the lower box body 20; and the bottom of each reinforcing transverse rib 60 is horizontally extended to both sides and is provided with mounting side plates, and the two mounting side plates of each reinforcing transverse rib 60 are respectively fixed to the inner bottom of the lower box body 20 by bolts.

[0044] Optionally, a battery mounting base 22 is provided at the inner bottom of the lower box 20, and the battery module 30 is fixed to the battery mounting base 22. In this embodiment, an upper skirt plate and a lower skirt plate are respectively extended horizontally outward from the lower edge of the upper box 10 and the upper edge of the lower box 20, and the upper skirt plate and the lower skirt plate are respectively fitted together and fixed together by a plurality of bolts.

[0045] Correspondingly, the present invention also provides an automobile, comprising the anti-extrusion battery pack as described in any one of the above items.

[0046] Therefore, the anti-extrusion battery pack described in the present invention is achieved by respectively arranging several groups of ear structures on the two outer sides of the lower box body 20, and correspondingly arranging reinforcing side ribs 40 on the inner wall of the lower box body 20, and respectively arranging reinforcing transverse ribs 60 between each group of ear structures, and making the two ends of the reinforcing transverse ribs 60 respectively rest on the two reinforcing side ribs 40, and the two ends of each reinforcing transverse rib 60 respectively face the two ear pieces 50 of each group of ear structures; in this way, the anti-extrusion performance of both sides of the lower box body 20 is greatly enhanced, and when the lower box body 20 is squeezed, the ear pieces 50 on both sides can be deformed by force first, and the reinforcing side ribs 40 and the reinforcing transverse ribs 60 inside the lower box body 20 further improve the anti-extrusion ability of the ear pieces 50, so that the anti-extrusion performance of the battery pack of the present invention is greatly improved, thereby improving the safety performance of the battery pack.

[0047] like Figure 8 and Figure 9 As shown, the present invention also provides a method for simulating the compression resistance of a battery pack, comprising the following steps:

[0048] S1, constructing a battery pack simulation model according to the parameters of the anti-extrusion battery pack as described above;

[0049] S2: Construct a test site model based on the anti-extrusion performance test site. The test site model includes extrusion columns, ground, and extrusion walls. Combine this with the battery pack simulation model in S1 to build a model scene for the extrusion experiment.

[0050] S3. After the ground and the extrusion wall in S2 are set perpendicular to each other, the battery pack simulation model is placed flat on the ground with the side with the ear piece 50 against the extrusion wall. Based on actual test conditions, the extrusion column is controlled to squeeze one of the ear pieces 50 on the other side of the battery pack simulation model, causing the battery pack simulation model to deform toward the extrusion wall.

[0051] S4, calculating in real time the extrusion force of the extrusion column on the hanging ear 50, the reaction force of the hanging ear 50 on the extrusion column, and the deformation of the hanging ear 50 relative to the battery pack simulation model, and tracking the reaction force curve of the extrusion column during the extrusion process;

[0052] S5, check the reaction force curve of the extrusion column, and obtain the deformation of the ear pieces 50 on both sides of the battery pack simulation model in real time, and judge the flipping status of the ear pieces 50 on both sides of the battery pack simulation model; before the reverse extrusion force reaches 100kN, if the ear pieces 50 on both sides of the battery pack simulation model are not completely flipped up, store the initial parameters of the battery pack simulation model; if the ear pieces 50 on both sides of the battery pack simulation model are already completely flipped up, readjust the parameters of the battery pack simulation model until it is satisfied that the ear pieces 50 on both sides of the battery pack simulation model are not completely flipped up before the reverse extrusion force reaches 100kN.

[0053] like Figure 10 As shown, Figure 10 The following is a schematic diagram of the extrusion reaction force curve of the battery pack anti-extrusion test method of the present invention. Combined with the deformation state of the extrusion column of the test site model and the battery pack simulation model during the extrusion process, the following analysis is performed in stages:

[0054] Stage 1-a2: 0-0.024s, the maximum anti-extrusion reaction force exerted by the extrusion column on the lifting lug 50 reaches 26.2kN;

[0055] a2-b2 stage: 0.024s-0.031s, a small range of slippage occurs between the extrusion column and the ear piece 50, and the anti-extrusion reaction force is reduced to 21.5kN;

[0056] b2-c2 stage: 0.031s-0.08s, the ear piece 50 squeezed by the extrusion column is squeezed and gradually turned up. At this time, the anti-extrusion ability of the ear piece 50 is low, and the reaction force on the extrusion column slowly increases;

[0057] Stage c2-d2: 0.08s-0.096s, the extrusion column squeezes to the bottom of the lower box 20, and the reaction force on the extrusion column increases to 82.1kN;

[0058] Stage d2-e2: 0.096s-0.101s, the ear piece 50 opposite the extrusion column slips against the extrusion wall, and the anti-extrusion capacity decreases to 59.3kN;

[0059] e2-f2 stage: 0.101s-0.141s, the reaction force on the extrusion column reaches 100kN. Combined with the deformation state of the battery pack simulation model, it can be judged that when the battery pack is subjected to an extrusion force of 100kN, if the outer box of the battery pack simulation model is not damaged or deformed, it means that the battery pack simulation model is qualified; if the outer box of the battery pack simulation model is damaged and deformed, it means that the battery pack simulation model is unqualified.

[0060] Therefore, the present invention conducts extrusion simulation analysis on the anti-extrusion battery pack. According to the reaction force curve during the extrusion process and the stress deformation of each component of the battery pack, the reasons for the weak extrusion strength are analyzed and located, and corresponding design optimization is performed to improve the anti-extrusion ability of the battery pack. At the same time, it can replace part of the physical test, reduce the testing cost in the design process, and save design time in the development process.

[0061] The above-described embodiments represent only a few implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed invention's methods for simulating the testing of the extrusion resistance of a battery pack, a vehicle, and a battery pack. It should be noted that variations and improvements are possible within the scope of the present invention, as would be apparent to those skilled in the art.

Claims

1. A crush-resistant battery pack, characterized in that: The battery module comprises an upper box body, a battery module and a lower box body, wherein the upper box body is a cavity structure with an opening at the lower end, and the lower box body is a cavity structure with an opening at the upper end, and the lower end edge of the upper box body and the upper end edge of the lower box body are spliced ​​with each other to form an internal hollow box structure, and the battery module is fixed in the box body structure; the two inner side walls of the lower box body are respectively provided with reinforcing side ribs in parallel, and the two outer side walls of the lower box body are respectively provided with a plurality of groups of ear structures symmetrically, each group of ear structures comprises two ear pieces, and a reinforcing transverse rib is respectively provided between the two ear pieces of each group of ear structures, the two ends of each reinforcing transverse rib rest against the two reinforcing side ribs, and the two ends of each reinforcing transverse rib are respectively opposite to the two ear pieces of each group of ear structures; The two reinforcing side ribs each include a primary right-angle plate and a secondary right-angle plate, and the primary right-angle plate and the secondary right-angle plate of each reinforcing side rib are connected to form a stepped structure; the two inner side walls of the lower box body are respectively provided with right-angle bosses, and the outer side walls of the two reinforcing side ribs respectively fit and abut against the right-angle bosses of the two inner side walls of the lower box body; The two reinforcing side ribs are respectively provided with a plurality of first through holes, and the two reinforcing side ribs are respectively passed through the respective first through holes by a plurality of bolts and fixed to the right-angled bosses on the two inner side walls of the lower box body; The two outer side walls of the lower box are respectively fixed with right-angle side plates, and the two lifting ear members of each set of lifting ear structures are respectively symmetrically arranged on the two right-angle side plates; Each of the ear pieces includes an upper ear and a lower ear, the lower surface of the upper ear of each ear piece is in contact with the upper surface of the lower ear, and a right-angle mounting seat is provided on the side of the upper ear of each ear piece close to the two right-angle side plates, so that the upper ear of each ear piece is fixed to the two right-angle side plates through its own right-angle mounting seat.

2. The anti-extrusion battery pack according to claim 1, characterized in that: Three groups of ear structures are respectively provided on the two right-angled side panels of the lower box body, and the three groups of ear structures are equally spaced on the two right-angled side panels; three reinforcing transverse ribs are respectively provided in parallel on the inner bottom of the lower box body, and the two ends of the three reinforcing transverse ribs are respectively against the two reinforcing side ribs, and the two ends of the three reinforcing transverse ribs are respectively opposite to the two ear pieces of the three groups of ear structures.

3. The anti-extrusion battery pack according to claim 2 is characterized in that: The three reinforcing transverse ribs are all long strip structures, and the bottom of each reinforcing transverse rib rests on the inner bottom of the lower box body; and the bottom of each reinforcing transverse rib is horizontally extended to both sides to provide mounting side plates, and the two mounting side plates of each reinforcing transverse rib are respectively fixed to the inner bottom of the lower box body by bolts.

4. The anti-extrusion battery pack according to any one of claims 1 to 3, characterized in that: A battery mounting seat is provided at the inner bottom of the lower box body, and the battery module is fixed on the battery mounting seat.

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