Battery pack shell structure and battery pack

Abstract

The utility model provides a battery pack shell structure and a battery pack, the battery pack shell structure comprises a lower shell with an open bottom, a bottom guard plate arranged at the bottom of the lower shell, and a plurality of fasteners used for connecting the bottom guard plate and the lower shell together, a plurality of support blocks for separating the lower shell from the bottom guard plate are arranged between the lower shell and the bottom guard plate, and the bottom guard plate is arranged on the bottom guard plate. A gap is defined by the bottom protection plate, the lower shell and every two adjacent supporting blocks, and the bottom protection plate and / or the lower shell are / is provided with a first air blocking part protruding towards the interior of the gap. According to the battery pack shell structure disclosed by the utility model, the connection firmness between the bottom protection plate and the lower shell is favorably improved by arranging the supporting block, and the ventilation area is favorably reduced by arranging the first air blocking part which protrudes towards the interior of the gap on the bottom protection plate and / or the lower shell; therefore, abnormal sound generated when air flow flows into the space between the bottom protection plate and the lower shell is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a battery pack housing structure; at the same time, the utility model also relates to a kind of... Background Art

[0002] With the pursuit of high cruising range for electric vehicles, the size and grouping efficiency of battery packs are getting larger and larger. And with the increasingly strict regulatory requirements, more and more battery packs begin to add steel guards at the bottom of the battery pack. At present, most electric vehicles install the battery pack under the middle floor of the vehicle body. In this way, the chassis space can be fully utilized, and at the same time, sufficient ground clearance can be ensured to meet the passing performance requirements of the vehicle. In addition, this layout also helps to improve the axle load distribution and collision safety of the vehicle. However, the problem of abnormal noise appears significantly in the bottom guard plate of the large-size battery pack on the whole vehicle, which is not conducive to the NVH (Noise Vibration Harshness) performance of the battery pack. Summary of the Utility Model

[0003] In view of this, the utility model aims to provide a battery pack housing structure to facilitate reducing the abnormal noise of the battery pack.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows:

[0005] A battery pack housing structure includes a lower housing with an open bottom, a bottom guard plate arranged at the bottom of the lower housing, and a plurality of fasteners for connecting the bottom guard plate and the lower housing together. And a plurality of support blocks for separating the two are arranged between the lower housing and the bottom guard plate. Clearances are respectively formed among the bottom guard plate, the lower housing and two adjacent support blocks. A first wind shield part protruding into the clearance is arranged on the bottom guard plate and / or the lower housing.

[0006] Further, the first wind shield part includes a plurality of flanges arranged at the edge of the bottom guard plate and protruding into the clearance, and each flange abuts against the lower housing.

[0007] Further, a second wind shield part extending downward is arranged at the edge of at least one side of the lower housing, and the second wind shield part is used to block the outside of each clearance on the same side.

[0008] Further, the second wind shield part has an extending part exceeding the bottom guard plate, and the height H of the extending part satisfies: H≥1.5mm.

[0009] Further, a seal is provided between the lower housing and the bottom guard plate and is arranged circumferentially therebetween. The seal is located inside each of the gaps and is configured to block the airflow flowing in through the gaps from entering the space defined by the seal, the lower housing, and the bottom guard plate.

[0010] Further, a plurality of cross beams are provided in the lower housing at intervals along its length direction, and a plurality of connection points for connecting to at least one of the cross beams are provided on the bottom guard plate; and / or, a plurality of reinforcing ribs are arranged on the bottom guard plate in a staggered manner along its length direction or width direction, and the bottom guard plate is divided into multiple bent and connected regions by the reinforcing ribs.

[0011] Further, a liquid cooling plate is provided in the lower housing above the bottom guard plate, and a plurality of pieces of foam are provided between the bottom guard plate and the liquid cooling plate and are respectively located between adjacent two of the cross beams; and / or, the height h of the reinforcing ribs satisfies: 0.8 mm ≤ h ≤ 3 mm.

[0012] Further, the area A of the foam and the area B of the bottom guard plate between the corresponding adjacent two cross beams satisfy: A / B ≥ 0.7.

[0013] Further, the thickness d of the bottom guard plate satisfies: 0.8 mm ≤ d ≤ 1.2 mm.

[0014] Compared with the prior art, the present utility model has the following advantages:

[0015] For the battery pack housing structure of the present utility model, by providing the support blocks, it is beneficial to improve the connection firmness between the bottom guard plate and the lower housing, and by providing the first wind blocking portions protruding into the gaps on the bottom guard plate and / or the lower housing, it is beneficial to reduce the ventilation area, thereby facilitating the reduction of abnormal noises generated due to the airflow flowing into the space between the bottom guard plate and the lower housing.

[0016] In addition, the flanging is provided at the edge of the bottom guard plate, which has the advantages of simple structure, easy processing and good wind blocking effect. By providing the second wind blocking portion to block outside the gaps, it is beneficial to reduce the airflow flowing into the gaps and also beneficial to reduce the abnormal noises generated due to the airflow flowing into the space between the bottom guard plate and the lower housing. The setting of the height of the extending portion in the second wind blocking portion is beneficial to further ensure the wind blocking effect of the second wind blocking portion. The setting of the seal is beneficial to block the airflow outside the seal and also beneficial to reduce the abnormal noises generated due to the airflow flowing into the space between the bottom guard plate and the lower housing. By providing a plurality of connecting members on the bottom guard plate to connect with the cross beams, it is beneficial to improve the connection firmness between the bottom guard plate and the lower housing and also beneficial to reduce the abnormal noises generated therebetween; making the bottom guard plate divided into multiple bent and connected regions by the reinforcing ribs is beneficial to improve the stiffness of the bottom guard plate, and the structure of the reinforcing ribs is simple and easy to process.

[0017] In addition, by arranging multiple pieces of foam between the bottom guard plate and the liquid cooling plate, it is beneficial to improve the support effect on the bottom guard plate, thereby further facilitating the suppression of the deformation of the bottom guard plate; the setting of the height range of the reinforcing ribs is beneficial to ensuring the strengthening effect. A lower-depth reinforcing rib is not conducive to the rigidity of the bottom guard plate, and a higher reinforcing rib will occupy the space in the height direction of the battery pack. The ratio of the area A of the foam to the area B of the bottom guard plate between two adjacent cross beams is beneficial to ensuring the support effect on the bottom guard plate. The setting of the thickness of the bottom guard plate not only helps to ensure the strength of the bottom guard plate but also facilitates lightweight design.

[0018] In addition, another object of the present invention is to provide a battery pack, including the battery pack housing structure as described above.

[0019] By providing the battery pack housing structure as described above, the battery pack of the present invention is beneficial to reducing the abnormal noise in the installed state, thereby facilitating the improvement of the NVH performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 is the exploded view of the battery pack housing structure according to the embodiment of the present invention;

[0022] Figure 2 is the bottom view of the battery pack housing structure according to the embodiment of the present invention;

[0023] Figure 3 is Figure 2 the cross-sectional view in the A-A direction of

[0024] Figure 4 is Figure 3 the partial structural schematic diagram of

[0025] Figure 5 is the structural schematic diagram of the lower housing according to the embodiment of the present invention;

[0026] Figure 6 is Figure 5 the enlarged view of part B in

[0027] Figure 7 is the structural schematic diagram of the bottom guard plate according to the embodiment of the present invention;

[0028] Figure 8 is the partial structural schematic diagram of the bottom guard plate according to the embodiment of the present invention.

[0029] DESCRIPTION OF THE REFERENCE NUMERALS:

[0030] 1. Lower housing; 2. Bottom guard plate; 3. Foam; 4. Fastener;

[0031] 100. Connection surface; 101. Cross beam; 102. Longitudinal beam; 103. Frame; 104. Second wind blocking part; 105. Support block;

[0032] 201. Flange; 202. First reinforcing rib; 203. Second reinforcing rib; 204. Third reinforcing rib; 205. Second connection hole; 206. Fourth connection hole. Specific embodiments

[0033] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0034] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0036] This embodiment relates to a battery pack housing structure to reduce abnormal noise generated when the battery pack is in the installed state.

[0037] In terms of the overall structure, the battery pack housing structure includes a lower housing 1 with an open bottom, a bottom guard plate 2 provided at the bottom of the lower housing 1, and a plurality of fasteners 4 for connecting the bottom guard plate 2 and the lower housing 1 together. A plurality of support blocks 105 for separating the two are provided between the lower housing 1 and the bottom guard plate 2. Gaps are respectively formed between the bottom guard plate 2, the lower housing 1, and adjacent two support blocks 105. A first wind blocking part protruding into the gap is provided on the bottom guard plate 2 and / or the lower housing 1.

[0038] For the battery pack housing structure described in this embodiment, by providing the support blocks 105, it is beneficial to improve the connection firmness between the bottom guard plate 2 and the lower housing 1, and by providing the first wind blocking part protruding into the gap on the bottom guard plate 2 and / or the lower housing 1, it is beneficial to reduce the ventilation area, thereby facilitating the reduction of abnormal noise generated due to the inflow of air between the bottom guard plate 2 and the lower housing 1.

[0039] Based on the above overall introduction, an exemplary structure of the battery pack housing described in this embodiment is as Figures 1 to 3As shown in. The structure of the lower housing 1 is as Figure 5 and Figure 6 As shown in, the structure of the bottom guard plate 2 is as Figure 7 and Figure 8 As shown in. Specifically, the lower housing 1 is provided with a circumferentially arranged frame 103, and the frame 103 has a connecting surface 100 facing the bottom guard plate 2 and connected to the bottom guard plate 2. As a preferred embodiment, the above-mentioned plurality of support blocks 105 are arranged at intervals on the connecting surface 100. The support blocks 105 can be integrally formed with the frame 103 or fixed on the connecting surface 100 by welding. Of course, in addition to arranging the support blocks 105 on the frame 103, the support blocks 105 can also be arranged on the bottom guard plate 2.

[0040] Each support block 105 is provided with a through hole, the frame 103 is provided with a first connection hole corresponding to the through hole, and a nut is arranged at the end of the first connection hole. In addition, the bottom guard plate 2 is provided with a second connection hole 205 corresponding to the through hole one by one. The fastener 4 can be a bolt, and the bolt passes through the second connection hole 205, the through hole and the corresponding first connection hole and is screwed with the nut fixed on the frame 103, so as to fix the bottom guard plate 2 on the lower housing 1. Here, the installation method of the bottom guard plate 2 is simple, convenient to operate, and has high connection firmness.

[0041] As a preferred embodiment, as Figure 7 and Figure 8 As shown in, the first wind blocking part includes a plurality of flanges 201 arranged at the edge of the bottom guard plate 2 and protruding into the gap, and each flange 201 abuts against the lower housing 1. Here, the flanges 201 are arranged at the edge of the bottom guard plate 2, which has the advantages of simple structure, convenient processing and good wind blocking effect. Specifically, each flange 201 is respectively arranged between two adjacent first connection holes and is strip-shaped, and the flange 201 abuts against the connecting surface 100, so as to maximize the reduction of the ventilation area of the gap, and thus is beneficial to reducing the abnormal noise generated by the airflow flowing into the gap. It should be noted that in addition to using the flanges 201 for the first wind blocking part, convex blocks arranged on the connecting surface 100 can also be used, or, the flanges 201 and convex blocks can be arranged at the same time, as long as the ventilation area of the gap can be reduced.

[0042] In this embodiment, the lower housing 1 is provided with a second wind blocking part 104 extending downward at at least one side edge, and the second wind blocking part 104 is used to block the outside of each gap on the same side. Here, by arranging the second wind blocking part 104 to block the outside of the gap, it is beneficial to reduce the airflow flowing into the gap, and also beneficial to reducing the abnormal noise generated by the airflow flowing into the space between the bottom guard plate 2 and the lower housing 1. In terms of specific structure, as Figure 4 and Figure 6As shown in the figure, the second wind-blocking part 104 is a wind-blocking plate provided at the bottom of the frame 103, and the wind-blocking plate is located outside the bottom guard plate 2. Preferably, wind-blocking plates are provided around the frame 103 outside the bottom guard plate 2, which is beneficial to maximizing the blocking of air flow from entering the gap, and thus is also beneficial to reducing abnormal noises.

[0043] As Figure 4 shown in the figure, the second wind-blocking part 104 has an extended part that extends beyond the bottom guard plate 2, and the height H of the extended part satisfies: H≥1.5 mm. Here, the setting of the height of the extended part in the second wind-blocking part 104 is beneficial to further ensuring the wind-blocking effect of the second wind-blocking part 104. Specifically, the height of the extended part is the distance between the bottom end surface of the wind-blocking plate and the bottom surface of the bottom guard plate 2. When the height H is less than 1.5 mm, the improvement effect of the wind-blocking plate on the abnormal noise problem is not obvious. The height H here can be, for example, 1.5 mm, 1.8 mm, 2 mm or 2.2 mm, etc., and it can be determined according to requirements during specific implementation.

[0044] To further reduce the abnormal noise problem of the battery pack, in this embodiment, a seal is provided between the lower housing 1 and the bottom guard plate 2 along the circumferential direction of the two, and the seal is located inside each gap. The seal is used to block the air flow flowing in from the gap from entering the space defined by the seal, the lower housing 1 and the bottom guard plate 2. Here, the setting of the seal is beneficial to blocking the air flow outside the seal, and is also beneficial to reducing the abnormal noise generated by the air flow flowing into the space between the bottom guard plate 2 and the lower housing 1. During specific implementation, the seal can be made of foam, and the foam 3 can be arranged between the bottom guard plate 2 and the frame 103 of the lower housing 1 by bonding, which is not only convenient for layout and implementation, but also has a good sealing effect.

[0045] As Figure 5 shown in the figure, a plurality of cross beams 101 are provided at intervals along the length direction of the lower housing 1, and a plurality of connection points for connecting to at least one of the cross beams 101 are provided on the bottom guard plate 2. By providing a plurality of connecting members on the bottom guard plate 2 to connect to the cross beams 101, it is beneficial to improve the connection firmness between the bottom guard plate 2 and the lower housing 1, and is also beneficial to reducing the abnormal noise generated between the two.

[0046] In terms of the detailed structure, four cross beams 101 are arranged at intervals in the length direction of the lower housing 1. Preferably, a plurality of connection points for connecting to each cross beam 101 are provided on the bottom guard plate 2. As Figure 7 and Figure 5As shown in the figure, a plurality of third connection holes are provided on each cross beam 101 at intervals in the width direction of the lower housing 1. The connection points on the bottom guard plate 2 include a plurality of fourth connection holes 206 arranged in one-to-one correspondence with the third connection holes. The bottom guard plate 2 and the cross beam 101 are connected together by screwing bolts and nuts passing through the third connection holes and the fourth connection holes 206. Of course, in specific implementation, the number of cross beams 101 connected to the bottom guard plate 2 can also be adjusted according to actual needs.

[0047] Furthermore, as Figure 5 and Figure 7 shown in the figure, the lower housing 1 further includes longitudinal beams 102 extending along the length direction of the lower housing 1 and respectively connected to the cross beams 101. The bottom guard plate 2 is also connected to the longitudinal beams 102 through the cooperation of bolts and nuts. In this way, it is beneficial to increase the connection area 100 between the bottom guard plate 2 and the lower housing 1, so that connections are made in both the length direction and the width direction of the battery pack, which is beneficial to suppressing the deformation of the bottom guard plate 2.

[0048] As Figure 1 shown in the figure, in this embodiment, a liquid cooling plate 5 is provided above the bottom guard plate 2 in the lower housing 1, and a plurality of pieces of foam 3 are provided between the bottom guard plate 2 and the liquid cooling plate 5 and are respectively located between adjacent cross beams 101. Through the cooperation of the plurality of pieces of foam 3, it is beneficial to improve the supporting effect on the bottom guard plate 2, and thus further beneficial to suppressing the deformation of the bottom guard plate 2. Preferably, the area A of the foam 3 and the area B of the bottom guard plate 2 between the corresponding adjacent cross beams 101 satisfy: A / B≥0.7. With such a setting, it is beneficial to ensure the supporting effect on the bottom guard plate 2.

[0049] Specifically, the foam 3 is rectangular, the area of the foam 3 is equal to its length multiplied by its width, and the area of the bottom guard plate 2 between the corresponding adjacent cross beams 101 is equal to the distance between the adjacent cross beams 101 multiplied by the length of the cross beam 101. In this way, the coverage rate of the foam 3 in the area between the adjacent cross beams 101 can be made greater than or equal to 70%, which is beneficial to ensuring the supporting effect on the bottom guard plate 2.

[0050] In addition, as Figure 7 shown in the figure, a plurality of reinforcing ribs are arranged in a staggered manner on the bottom guard plate 2 along its length direction or width direction, and the bottom guard plate 2 is divided into multiple bent and connected regions by the reinforcing ribs. This is beneficial to improving the stiffness of the bottom guard plate 2, and the structure of the reinforcing ribs is simple and easy to process and form. As a preferred structural example, the reinforcing ribs in this embodiment include a first reinforcing rib 202, a second reinforcing rib 203 and a third reinforcing rib 204. Among them, the first reinforcing rib 202 is in a block shape and is arranged at intervals in the length direction and the width direction of the bottom guard plate 2, and the second reinforcing rib 203 is in a bent wavy shape and extends along the width direction of the bottom guard plate 2.

[0051] Among them, the second reinforcing rib 203 is located between two adjacent columns of the first reinforcing ribs 202 and can be placed on one side of multiple first reinforcing ribs 202, so that the area between two adjacent first reinforcing ribs 202 is blocked by the second reinforcing rib 203 and cannot be penetrated, which is beneficial to cutting off the inertial area that is prone to cause the deformation of the bottom guard plate 2 and shortening the length of the inertial area, thereby facilitating the prevention of the instability problem of the bottom guard plate 2. The above-mentioned third reinforcing rib 204 extends along the length direction of the bottom guard plate 2 corresponding to the longitudinal beam 102. Of course, in specific implementation, the specific structural forms and positions of the first reinforcing rib 202 and the second reinforcing rib 203 can still be adaptively adjusted according to the usage requirements.

[0052] In this embodiment, the height h of the reinforcing rib satisfies: 0.8 mm ≤ h ≤ 3 mm, that is, the first reinforcing rib 202, the second reinforcing rib 203 and the third reinforcing rib 204 all satisfy 0.8 mm ≤ h ≤ 3 mm. This is beneficial to ensuring the strengthening effect. A reinforcing rib with a lower height is not conducive to the stiffness of the bottom guard plate 2, and a reinforcing rib with a higher height will occupy the space in the height direction of the battery pack. In specific implementation, the height h of the reinforcing rib can be, for example, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc.

[0053] In addition, in this embodiment, the thickness d of the bottom guard plate 2 satisfies: 0.8 mm ≤ d ≤ 1.2 mm. In specific implementation, the thickness d of the bottom guard plate 2 can be, for example, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm or 1.2 mm, etc. The setting of the thickness range of the bottom guard plate 2 here is not only beneficial to ensuring the strength of the bottom guard plate 2, but also beneficial to the lightweight design.

[0054] The battery pack housing structure in this embodiment, through the cooperation of the first wind blocking part with a gradually decreasing ventilation area, the second wind blocking part 104 blocking outside the gap and the seal, is beneficial to reducing the abnormal noise generated by the airflow flowing into the lower housing 1 and the bottom guard plate 2, thereby facilitating the improvement of the NVH performance of the battery pack. By also providing connection points on the bottom guard plate 2 connected to the cross beam 101, as well as multiple reinforcing ribs and the foam 3, it is not only beneficial to improving the stiffness of the bottom guard plate 2 and preventing the deformation of the bottom guard plate 2, but also can further improve the NVH performance of the battery pack. The structure of the entire battery pack housing is simple and convenient for layout and implementation.

[0055] In addition, another object of the present utility model is to propose a battery pack, including the battery pack housing structure as described above.

[0056] The battery pack described in this embodiment, by providing the battery pack housing structure as above, is beneficial to reducing the abnormal noise of the battery pack in the installed state, thereby facilitating the improvement of the NVH performance of the battery pack.

[0057] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery pack housing structure, characterized in that: It includes a lower shell body with an open bottom and a bottom guard plate arranged at the bottom of the lower shell body, and a plurality of fasteners for connecting the bottom guard plate and the lower shell body together, and a plurality of support blocks are arranged between the lower shell body and the bottom guard plate to separate the two, and gaps are respectively formed between the bottom guard plate, the lower shell body and two adjacent support blocks, and a first wind shield portion protruding into the gap is provided on the bottom guard plate and / or the lower shell body.

2. The battery pack housing structure according to claim 1, characterized in that: The first wind shielding portion includes a plurality of flanges which are arranged at the edge of the bottom guard plate and protrude into the gap, and each of the flanges abuts against the lower shell body.

3. The battery pack housing structure according to claim 1, characterized in that: The edge of at least one side of the lower shell is provided with a second wind shielding portion extending downward, and the second wind shielding portion is used to shield the outside of each of the gaps on the same side.

4. The battery pack housing structure according to claim 3, characterized in that: The second wind shield has an extension portion extending beyond the bottom guard plate, and a height H of the extension portion satisfies: H≥1.5 mm.

5. The battery pack housing structure according to claim 1, characterized in that: A seal is provided between the lower shell and the bottom guard plate and arranged circumferentially therebetween, and the seal is located on the inner side of each of the gaps. The seal is used to block the airflow flowing in from the gaps from entering the space defined by the seal, the lower shell and the bottom guard plate.

6. The battery pack housing structure according to claim 1, characterized in that: The lower shell is provided with a plurality of cross beams spaced apart along its length direction, and the bottom guard plate is provided with a plurality of connection points for connecting with at least one of the cross beams; and / or, The bottom guard plate is provided with a plurality of reinforcing ribs staggeredly arranged along its length direction or width direction, and the bottom guard plate is divided into a plurality of bent and connected regions by the reinforcing ribs.

7. The battery pack housing structure according to claim 6, characterized in that: A liquid cooling plate is provided in the lower shell body and is located above the bottom guard plate. A plurality of foam sheets are provided between the bottom guard plate and the liquid cooling plate and are located between two adjacent cross beams; and / or, The height h of the reinforcing rib satisfies: 0.8mm≤h≤3mm.

8. The battery pack housing structure according to claim 7, characterized in that: The area A of the foam and the area B of the bottom guard plate between two corresponding adjacent beams satisfy: A / B≥0.

7.

9. The battery pack housing structure according to any one of claims 1 to 8, characterized in that: The thickness d of the bottom guard plate satisfies: 0.8mm≤d≤1.2mm.

10. A battery pack, characterized in that: A battery pack casing structure comprising the battery pack casing structure described in any one of claims 1 to 9.

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