Battery pack and vehicle

Abstract

The utility model relates to a battery pack and a vehicle. The battery pack comprises a battery module; the box body is provided with a battery cavity for accommodating the battery module, and the battery cavity is provided with a top opening; the cover body is connected with the box body and covers the top opening of the battery cavity, a plurality of first grooves are formed in the upper surface of the cover body, one end of each first groove extends to the first side of the cover body, and the other end of each first groove extends to the second side of the cover body. The battery pack comprises a battery module, a box body and a cover body, the battery module is contained in a battery cavity of the box body, the cover body covers an opening in the top of the battery cavity, the cover body is provided with a plurality of first grooves arranged in the front-back direction, the first grooves extend to the right side of the cover body from the left side of the cover body, a convex rib is arranged between every two adjacent first grooves, and the convex rib is arranged between every two adjacent first grooves. The first groove and the convex rib are arranged alternately, so that the structural strength of the cover body can be improved, the deformation of the cover body is inhibited, the cover body is prevented from being damaged, the air tightness of the battery cavity is ensured, and the safety of the battery module is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery pack and a vehicle. Background Art

[0002] With the continuous development of lithium battery technology, secondary lithium batteries are assembled into battery modules as battery cells and widely used in the fields of power, consumption, energy storage, etc. During the long-term charge and discharge cycling process of the battery cells in the battery module, due to reasons such as lithium deintercalation and gas generation, a certain degree of expansion will occur, resulting in too high air pressure in the battery cavity of the battery pack box. In addition, if the working temperature of the battery cell is relatively high, it will also cause too high air pressure in the battery cavity. The structural strength of the upper cover of the existing battery pack is relatively low. When the air pressure in the battery cavity is too high, the upper cover is prone to bulge upwards. If the components above the upper cover (such as the vehicle chassis) are at a small distance from the upper cover, the bulged upper cover will directly hit the vehicle chassis, causing damage to the vehicle chassis or the upper cover; on the other hand, if the strength of the upper cover is poor, it is prone to deformation during assembly and transportation, which will cause the upper cover not to fit well with the box body, easily resulting in airtightness problems, thus affecting the safety of the battery module. Utility Model Content

[0003] Based on this, in view of the above technical problems, it is necessary to provide a battery pack and a vehicle that can improve the structural strength of the cover body and inhibit the deformation of the cover body.

[0004] In a first aspect, the present application provides a battery pack, including:

[0005] A battery module;

[0006] A box body provided with a battery cavity for accommodating the battery module, and the battery cavity has an opening at the top; and

[0007] A cover body connected to the box body and covering the opening at the top of the battery cavity, and a plurality of first grooves are provided on the upper surface of the cover body, and one end of the first groove extends to the first side of the cover body, and the other end extends to the second side of the cover body.

[0008] In one embodiment, the extending path of the first groove is arc-shaped.

[0009] In one embodiment, the first groove extends from the left side of the cover body to the right side of the cover body, and a plurality of the first grooves are arranged along the front-rear direction of the cover body.

[0010] In one embodiment, the first central axis of the cover body is located in the middle of the cover body in the left-right direction and extends in the front-rear direction, and the shape of the first groove is symmetric about the first central axis; and / or,

[0011] The second central axis of the cover body is located in the middle of the cover body in the front-rear direction and extends in the left-right direction. The plurality of first grooves are divided into a first group and a second group. The first group of first grooves is located on the front side of the second central axis, and the second group of first grooves is located on the rear side of the second central axis. Moreover, the shapes of the first group of first grooves and the second group of first grooves are symmetrical about the second central axis.

[0012] In one embodiment, the first group of first grooves protrude in a direction away from the second central axis.

[0013] In one embodiment, a second groove is provided at the front end and / or the rear end of the cover body.

[0014] In one embodiment, the plurality of second grooves are arranged along the left-right direction of the cover body.

[0015] In one embodiment, the first central axis of the cover body is located in the middle of the cover body in the left-right direction and extends in the front-rear direction. At the front end or the rear end of the cover body, the plurality of second grooves are divided into a first group and a second group. The first group of second grooves is located on the left side of the first central axis, and the second group of second grooves is located on the right side of the first central axis. Moreover, the shapes of the first group of second grooves and the second group of second grooves are symmetrical about the first central axis.

[0016] In one embodiment, a flange surrounding the battery cavity is provided at the edge of the cover body. The flange is lower than the bottom of the first groove or the second groove, and the flange is connected to the box body.

[0017] In a second aspect, the present application also provides a vehicle, including the battery pack described above.

[0018] The above introduces a battery pack and a vehicle. The battery pack includes a battery module, a box body, and a cover body. The battery module is accommodated in the battery cavity of the box body. The cover body seals the top opening of the battery cavity. A plurality of first grooves are provided on the upper surface of the cover body. One end of the first groove extends to the first side of the cover body, and the other end extends to the second side of the cover body. The adjacent two first grooves present as ribs. The first grooves and the ribs rise and fall one after another, which can improve the structural strength of the cover body, inhibit the deformation of the cover body, thereby protecting the cover body from damage, and is also beneficial to ensuring the airtightness of the battery cavity and improving the safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the battery pack provided by the embodiment of the present application;

[0020] Figure 2 is an exploded schematic diagram of the battery pack provided by the embodiment of the present application;

[0021] Figure 3 The top view of the cover body provided by the embodiment of the present application;

[0022] Figure 4 The left view of the cover body provided by the embodiment of the present application.

[0023] The description of the reference numerals in the embodiment of the present application is as follows:

[0024] Battery pack 100, box body 10, battery cavity 11, horizontal ribs 12, vertical ribs 13, cover body 20, first groove 21, first group of first grooves 211, second group of first grooves 212, second groove 22, first group of second grooves 221, second group of second grooves 222, flange 23, first central axis A, second central axis B. Specific embodiments

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0026] Referring to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0027] Please refer to Figure 1 , in order to facilitate the introduction of the technical solution of the battery pack 100, the up-down direction Z, front-back direction Y, and left-right direction X of the battery pack 100 are defined in this embodiment. Among them, the front-back direction Y can be the length direction of the box body 10.

[0028] Please refer to Figure 2 , the battery pack 100 of this embodiment includes a battery module (not shown), a box body 10, and a cover body 20. The box body 10 is provided with a battery cavity 11 for accommodating the battery module, and the battery cavity 11 has an opening at the top; the cover body 20 is connected to the box body 10 and seals the opening at the top of the battery cavity 11, and a plurality of first grooves 21 are provided on the upper surface of the cover body 20, and one end of the first groove 21 extends to the first side of the cover body 20, and the other end extends to the second side of the cover body 20.

[0029] In this embodiment, the battery module is accommodated in the battery cavity 11 of the box body 10, and the cover body 20 seals the top opening of the battery cavity 11. A plurality of first grooves 21 are provided on the upper surface of the cover body 20, and one end of the first groove 21 extends to the first side of the cover body 20, and the other end extends to the second side of the cover body 20. A rib is formed between two adjacent first grooves 21. The first grooves 21 and the ribs alternate with each other, which can improve the structural strength of the cover body 20, inhibit the deformation of the cover body 20, thereby protecting the cover body 20 from damage, and is also beneficial to ensuring the airtightness of the battery cavity 11 and improving the safety of the battery module.

[0030] In this embodiment, the two ends of the first groove 21 may refer to the two ends along its length direction or its extending direction. One end of the first groove 21 extends to the first side of the cover body 20, and the other end extends to the second side of the cover body 20. The first side and the second side may be two parallel sides, such as the front side and the rear side, or the left side and the right side; the first side and the second side may also be two sides forming an angle (such as perpendicular to each other), such as the front side and the left side / right side, or the rear side and the left side / right side.

[0031] Preferably, the first groove 21 extends from the left side of the cover body 20 to the right side of the cover body 20, and a plurality of first grooves 21 are arranged along the front-rear direction Y of the cover body 20, thereby improving the bending strength of the cover body 20 in the left-right direction X and inhibiting the deformation of the cover body 20.

[0032] The battery module includes a plurality of battery cells, and the battery cells may be lithium batteries, for example. The battery module is accommodated in the battery cavity 11 of the box body 10. The placement manner of the battery cells is not limited in this embodiment. The battery cells can be arranged along the front-rear direction Y, or along the left-right direction X, or stacked along the up-down direction Z. During the charging and discharging process of the battery cells, the air pressure in the battery cavity 11 will be relatively high, causing the cover body 20 to tend to deform.

[0033] To improve the structural strength of the box body 10 and also facilitate providing more structural support for the cover body 20, a plurality of ribs can be provided in the box body 10. For example, three horizontal ribs 12 and one vertical rib 13 are provided. The two ends of the vertical rib 13 are respectively connected to the two horizontal ribs 12, and the middle horizontal rib 12 is vertically connected to the vertical rib 13.

[0034] The cover body 20 is connected to the box body 10 and seals the top opening of the battery cavity 11. The connection between the cover body 20 and the box body 10 should be firm to ensure the airtightness of the battery cavity 11.

[0035] The upper surface of the cover body 20 is provided with a plurality of first grooves 21 arranged in the front-rear direction Y. The first grooves 21 extend from the left side to the right side of the cover body 20. The adjacent two first grooves 21 present as ribs. The first grooves 21 and the ribs rise and fall alternately, which can improve the bending strength of the cover body 20 in the left-right direction X and inhibit the deformation of the cover body 20. The number of the first grooves 21 can be 6. The distance between two adjacent first grooves 21 can be 90 mm, and the groove depth can be 4 mm.

[0036] The extending path of the first groove 21 is arc-shaped. Compared with a straight shape, the arc-shaped first groove 21 makes the overall strength of the cover body 20 higher, and a wider area has a higher bending strength.

[0037] Please refer to Figure 3 , for the convenience of introducing the technical solution of the battery pack 100, this embodiment also defines a first central axis A and a second central axis B of the cover body 20. The first central axis A is located in the middle of the cover body 20 in the left-right direction X and extends in the front-rear direction Y. The second central axis B is located in the middle of the cover body 20 in the front-rear direction Y and extends in the left-right direction X.

[0038] The shape of the first groove 21 is symmetric about the first central axis A, thereby making the structural strength of the cover body 20 relatively uniform in the left-right direction X, which is beneficial to inhibiting the uplift or subsidence of the left half or the right half of the cover body 20.

[0039] The plurality of first grooves 21 are divided into a first group and a second group. The first group of first grooves 211 is located on the front side of the second central axis B, and the second group of first grooves 212 is located on the rear side of the second central axis B. And the shape of the first group of first grooves 211 and the shape of the second group of first grooves 212 are symmetric about the second central axis B. Thereby making the structural strength of the cover body 20 relatively uniform in the front-rear direction Y, which is beneficial to inhibiting the uplift or subsidence of the front half or the rear half of the cover body 20. The first group of first grooves 211 and the second group of first grooves 212 can respectively include 3 first grooves 21.

[0040] The first group of first grooves 211 protrude in a direction away from the second central axis B, and the second group of first grooves 212 protrude in a direction away from the second central axis B, that is, the first group of first grooves 211 and the second group of first grooves 212 respectively protrude toward the ends of the cover body 20, thereby making a wider area of the cover body 20 have a higher bending strength.

[0041] The upper surfaces of the front end and the rear end of the cover body 20 are both provided with second grooves 22, thereby improving the structural strength of the front end and the rear end of the cover body 20. The plurality of second grooves 22 are arranged along the left-right direction X of the cover body 20, thereby enabling the cover body 20 to have a higher bending strength in a wider area in the left-right direction X. The front end and the rear end of the cover body 20 may be respectively provided with 6 second grooves 22, that is, the cover body 20 is provided with a total of 12 second grooves 22. The distance between two adjacent second grooves 22 may be 75 mm, and the groove depth may be 4 mm.

[0042] At the front end or the rear end of the cover body 20, the plurality of second grooves 22 are divided into a first group and a second group. The first group of second grooves 221 is located on the left side of the first central axis A, and the second group of second grooves 222 is located on the right side of the first central axis A, and the shapes of the first group of second grooves 221 and the second group of second grooves 222 are symmetric about the first central axis A. Thereby making the structural strength of the cover body 20 relatively uniform in the left-right direction X, which is beneficial to suppressing the uplift or subsidence of the left half or the right half of the cover body 20. At the front end of the cover body 20, the first group of second grooves 221 and the second group of second grooves 222 may respectively include 3 second grooves 22. At the rear end of the cover body 20, the first group of second grooves 221 and the second group of second grooves 222 may also respectively include 3 second grooves 22.

[0043] Furthermore, the shapes of the first group of first grooves 211 and the second group of first grooves 212 are symmetric about the second central axis B, and the shapes of the first group of second grooves 221 and the second group of second grooves 222 are symmetric about the first central axis A, thereby making the structural strength of the cover body 20 relatively uniform in both the front-rear direction Y and the left-right direction X, and improving the overall structural strength of the cover body 20.

[0044] Please refer to Figures 2 to 4 , a flange 23 surrounding the battery cavity 11 is provided at the edge of the cover body 20. The flange 23 is lower than the bottom of the first groove 21 and the second groove 22, and the flange 23 is connected to the box body 10. The flange 23 is connected to the top of the side wall of the box body 10, and the connection method may be screw connection or riveting. The flange 23 may be provided with a plurality of mounting holes arranged along its edge. A sealing foam may also be provided between the flange 23 and the top of the side wall of the box body 10. Since the flange 23 is lower than the bottom of the first groove 21 and the second groove 22, a level difference is formed between the flange 23 and the bottom of the first groove 21 or the second groove 22, which is beneficial to improving the structural strength of the edge of the cover body 20 and further improving the bending resistance of the cover body 20.

[0045] The forming process of the cover body 20 may be stamping or casting, and stamping is preferably used to ensure strength. The material of the cover body 20 may be cold-rolled steel sheet, such as DC01, and the thickness may be 0.8 mm. The first groove 21, the second groove 22 and the flange 23 may be formed by stamping on a cold-rolled steel sheet.

[0046] This embodiment can solve the problem of weak stiffness of the battery box cover. By adding grooves or ribs of a certain shape, the strength of the cover body 20 is improved, which can enhance the anti-deformation ability and safety of the battery pack 100 and also facilitate the assembly of the battery pack 100.

[0047] This application also provides a vehicle, including the aforementioned battery pack 100. The vehicle can be, for example, an electric vehicle, an electric bicycle, an electric tricycle, etc., which can be either a motor vehicle or a non-motor vehicle. The battery pack 100 can be installed on the chassis of the vehicle and used as the power battery of the vehicle. The cover body 20 provided in this embodiment has high structural strength and rigidity and is not easily deformed, and will not bulge too high to squeeze the chassis even when the air pressure in the battery cavity 11 is relatively high, thus improving the safety of the battery pack 100 and the vehicle.

[0048] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0049] The above-described embodiments only represent several implementation manners of this application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. A battery pack, characterized in that: include: Battery module; A box body, provided with a battery cavity for accommodating the battery module, wherein the battery cavity has a top opening; as well as A cover body is connected to the box body and covers the top opening of the battery cavity. A plurality of first grooves are provided on the upper surface of the cover body, and one end of the first groove extends to the first side of the cover body, and the other end extends to the second side of the cover body. A convex rib is formed between two adjacent first grooves, and the first grooves and the convex rib are alternately arranged.

2. The battery pack according to claim 1, characterized in that: The extension path of the first groove is arc-shaped.

3. The battery pack according to claim 1, characterized in that: The first groove extends from the left side of the cover body to the right side of the cover body, and a plurality of the first grooves are arranged along the front-to-back direction of the cover body.

4. The battery pack according to claim 3, characterized in that: The first central axis of the cover body is located in the middle of the cover body in the left-right direction and extends in the front-back direction, and the shape of the first groove is symmetrical about the first central axis; and / or, The second central axis of the cover body is located in the middle of the cover body along the front-to-back direction and extends along the left-to-right direction, and the plurality of first grooves are divided into a first group and a second group, the first grooves of the first group are located on the front side of the second central axis, and the first grooves of the second group are located on the rear side of the second central axis, and the shapes of the first grooves of the first group and the shapes of the first grooves of the second group are symmetrical about the second central axis.

5. The battery pack according to claim 4, characterized in that: The first group of the first grooves protrude in a direction away from the second central axis.

6. The battery pack according to any one of claims 1 to 5, characterized in that: A second groove is provided on the upper surface of the front end and / or the rear end of the cover body.

7. The battery pack according to claim 6, characterized in that: A plurality of the second grooves are arranged along the left-right direction of the cover body.

8. The battery pack according to claim 7, characterized in that: The first central axis of the cover body is located in the middle of the cover body in the left-right direction and extends in the front-back direction. At the front end or rear end of the cover body, multiple second grooves are divided into a first group and a second group. The second grooves of the first group are located on the left side of the first central axis, and the second grooves of the second group are located on the right side of the first central axis. The shapes of the second grooves of the first group and the second group are symmetrical about the first central axis.

9. The battery pack according to claim 6, characterized in that: The edge of the cover body is provided with a flange surrounding the battery cavity, the flange is lower than the bottom of the first groove or the second groove, and the flange is connected to the box body.

10. A vehicle, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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