Battery pack lower box body and battery pack

Abstract

The utility model discloses a battery pack lower box body and a battery pack. The battery pack lower box body comprises an edge frame and a cross beam which are arranged on one side of a bottom plate, a first hanging lug arranged on the outer side of the edge frame, and an adapter plate arranged on the inner side of the edge frame, the cross beam is fixedly connected with the bottom plate, the two ends of the cross beam abut against the inner side of the edge frame, one end of the adapter plate is fixedly connected with the edge frame, and the other end of the adapter plate is fixedly connected with the cross beam. According to the utility model, the condition that the edge frame is cracked due to stress concentration is avoided, and the reliability of the whole lower box body of the battery pack is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack lower box and a battery pack. Background Art

[0002] The battery pack is a core component of new energy electric vehicles, used to mount battery modules. The mounting lugs in the battery pack primarily refer to metal components used to mount and secure the battery pack. Patent application number CN201911295255.4, titled "Battery Pack Lower Case and Battery Pack," discloses a battery pack lower case and battery pack. The battery pack lower case comprises an annular frame and a base plate. The frame is connected to the base plate to form a chamber for accommodating the battery modules. A medium circulation conduit is disposed within the chamber. The conduit has a medium inlet and a medium outlet, which are disposed on the outer side of the frame. The conduit bends and extends in a plane parallel to the base plate. The ratio of the pipe height to the pipe diameter is 1:(1.2-6). The specification states that two mounting lugs may be disposed on the outer side of the first end plate for mounting the battery pack in external equipment. However, if the mounting lugs vibrate, the stress generated by the vibrations is concentrated on the case, causing cracking and poor reliability. Utility Model Content

[0003] The purpose of the utility model is to provide a battery pack lower box and a battery pack, which can avoid cracking of the edge frame due to stress concentration and improve the reliability of the entire battery pack lower box.

[0004] The technical solution adopted by the present invention to solve its technical problems is that, in the first aspect, a battery pack lower box and a battery pack are proposed, including an edge frame and a crossbeam arranged on one side of the bottom plate, a first hanging ear arranged on the outside of the edge frame, and an adapter plate arranged on the inside of the edge frame; the crossbeam is fixedly connected to the bottom plate, and both ends of the crossbeam abut against the inner side of the edge frame; one end of the adapter plate is fixedly connected to the edge frame, and the other end is fixedly connected to the crossbeam.

[0005] In an embodiment of the present application, the adapter plate includes a first rotation plate and a second rotation plate arranged vertically, the first rotation plate is fixedly connected to the edge frame, and the second rotation plate is fixedly connected to the crossbeam.

[0006] In an embodiment of the present application, a rib is provided between the first rotating plate and the second rotating plate.

[0007] In an embodiment of the present application, a first cooling port and a second cooling port are arranged on the edge frame, and the base plate includes a first supporting plate, a cooling plate and a second supporting plate arranged in sequence from top to bottom. A cooling channel is provided on the cooling plate, and the first cooling port and the second cooling port are connected to the cooling channel.

[0008] In the embodiment of the present application, the cooling channel is formed by the cooling plate being recessed toward the first supporting plate.

[0009] In an embodiment of the present application, a second hanging ear is provided on a side of the edge frame away from the first hanging ear, and the second hanging ear is fixedly connected to the outer side of the edge frame.

[0010] In the embodiment of the present application, adapter blocks are provided on both sides of the second hanging ear.

[0011] In an embodiment of the present application, a first hanging plate and a second hanging plate are further provided on the outside of the edge frame and are symmetrically arranged along the edge frame. The arrangement surfaces of the first hanging plate and the second hanging plate are different from the arrangement surfaces of the first hanging ear and the second hanging ear. The first hanging plate and the second hanging plate are provided with multiple hanging ears.

[0012] In an embodiment of the present application, a first reinforcing rib, a second reinforcing rib and a third reinforcing rib are further provided on the bottom plate; the first reinforcing rib, the second reinforcing rib and the third reinforcing rib are used to divide the area surrounded by the edge frame into multiple battery arrangement units.

[0013] In a second aspect, a battery pack is provided, comprising a battery assembly, an upper cover, and the battery pack lower case, wherein the upper cover is covered on the battery pack lower case to form a storage space for accommodating the battery assembly.

[0014] The beneficial effects of the utility model are:

[0015] 1. In the battery pack lower case and battery pack proposed in this utility model, when the first mounting ear vibrates, the stress generated by the first mounting ear is transferred to the edge frame and then further transferred to the crossbeam inside the edge frame through the adapter plate. This prevents cracking of the edge frame due to stress concentration and improves the reliability of the entire battery pack lower case.

[0016] 2. The battery pack lower case and battery pack proposed in this utility model further include ribs disposed between the first rotating plate and the second rotating plate. The ribs enhance the strength and rigidity of the entire adapter plate.

[0017] 3. The utility model proposes a battery pack lower box and a battery pack, and a first reinforcing rib, a second reinforcing rib and a third reinforcing rib are further provided on the bottom plate. The first reinforcing rib, the second reinforcing rib and the third reinforcing rib divide the area surrounded by the edge frame into multiple battery arrangement units, so that each battery arrangement unit accommodates part of the batteries. When the entire battery pack lower box is subjected to vibration or impact, each battery arrangement unit only accommodates part of the batteries, resulting in a smaller total inertia of the batteries in each battery arrangement unit, reducing the probability of the batteries colliding with the inner wall, thereby reducing the impact of vibration or impact on the batteries in the battery pack lower box. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. Those skilled in the art can derive other drawings from these drawings without inventive effort.

[0019] Figure 1 This is a schematic diagram of a lower box of a battery pack according to an embodiment of the present invention;

[0020] Figure 2 This is a top view of a lower box of a battery pack according to an embodiment of the present utility model;

[0021] Figure 3 This is a cross-sectional view of the bottom plate of the lower box of a battery pack according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of an adapter plate of a battery pack lower box according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of an adapter block of a battery pack lower box according to an embodiment of the present invention.

[0024] In the figure: 1. Base plate; 11. First bearing plate; 12. Cooling plate; 13. Second bearing plate; 14. First reinforcing rib; 15. Second reinforcing rib; 16. Third reinforcing rib; 17. Cooling channel; 2. Edge frame; 21. First hanging plate; 22. Second hanging plate; 3. Crossbeam; 4. First hanging ear; 5. Adapter plate; 51. First rotating plate; 52. Second rotating plate; 53. Raised rib; 6. First cooling port; 7. Second cooling port; 8. Second hanging ear; 9. Adapter block. DETAILED DESCRIPTION

[0025] To more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the following describes specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the drawings described below are merely examples of the present invention. A person skilled in the art can, without inventive effort, derive other drawings and other embodiments from these drawings. Furthermore, design orientations only represent relative positional relationships between components, not absolute positional relationships.

[0026] The present invention provides a battery pack lower box and a battery pack. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 , mainly includes a base plate 1, an edge frame 2, a crossbeam 3, a first hanging ear 4 and an adapter plate 5.

[0027] In a first aspect, a battery pack lower case is provided. The battery pack lower case includes a base plate 1, an edge frame 2, and a crossbeam 3. The edge frame 2 is disposed on one side of the base plate 1 and fixedly connected to the base plate 1, thereby forming a storage space for the battery cell assembly. A crossbeam 3 is also disposed on the side of the base plate 1 where the edge frame 2 is disposed. The crossbeam 3 is fixedly connected to the base plate 1, and its ends abut against the edge frame 2, thereby enhancing the structural strength of the entire battery pack lower case. A first mounting lug 4 is disposed on the outside of the edge frame 2, and an adapter plate 5 is disposed on the inside of the edge frame 2. The first mounting lug 4 is fixedly connected to the edge frame 2, with one end of the adapter plate 5 fixedly connected to the edge frame 2 and the other end fixedly connected to the crossbeam 3. When the first mounting lug 4 vibrates, the stress generated by the vibration of the first mounting lug 4 is transferred to the edge frame 2 and then further transferred through the adapter plate 5 to the crossbeam 3 inside the edge frame 2, thereby preventing cracking of the edge frame 2 due to stress concentration and improving the reliability of the entire battery pack lower case.

[0028] Specifically, two first hanging ears 4 are provided, and the two first hanging ears 4 are symmetrically arranged along the symmetry axis of the edge frame 2 .

[0029] In one embodiment, the adapter plate 5 includes a first rotating plate 51 and a second rotating plate 52 arranged vertically, wherein the first rotating plate 51 is fixedly connected to the edge frame 2, and the second rotating plate 52 is fixedly connected to the crossbeam 3. Specifically, the first rotating plate 51 and the second rotating plate 52 are fixedly connected by rivet screws.

[0030] Furthermore, a rib 53 is provided between the first rotating plate 51 and the second rotating plate 52 . The design of the rib 53 improves the strength and rigidity of the entire adapter plate 5 .

[0031] In one embodiment, a first cooling port 6 and a second cooling port 7 are arranged on the edge frame 2, wherein the first cooling port 6 is used to guide the coolant to the lower box of the battery pack, and the second cooling port 7 is used to guide the coolant out of the lower box of the battery pack. The bottom plate 1 includes a first carrier plate 11, a cooling plate 12 and a second carrier plate 13 arranged from top to bottom. The first carrier plate 11 is fixedly connected to the cooling plate 12, and the cooling plate 12 is fixedly connected to the second carrier plate 13. A cooling channel 17 is provided on the cooling plate 12. The first cooling port 6 and the second cooling port 7 are both connected to the cooling channel 17. During cooling, the coolant is introduced from the first cooling port 6, then enters the cooling channel 17, is cooled in the cooling channel 17, and then is guided out from the second cooling port 7.

[0032] Furthermore, the cooling channel 17 is formed by the cooling plate 12 being recessed toward the first supporting plate 11 , and the space between adjacent recesses is the cooling channel 17 .

[0033] In one embodiment, a second hanging ear 8 is provided on a side of the edge frame 2 away from the first hanging ear 4 , and the second hanging ear 8 is fixedly connected to the outer side of the edge frame 2 .

[0034] Furthermore, adapter blocks 9 are provided on both sides of the second hanging ear 8. One end of the adapter block 9 is fixedly connected to the second hanging ear 8 by arc welding, and the other end is fixedly connected to the edge frame 2 by arc welding. In this way, when the second hanging ear 8 transfers the force it is subjected to to the edge frame 2, there will be four welds that are subjected to force, the force is more uniform, and the structural strength is higher.

[0035] Furthermore, the outer side of the edge frame 2 is provided with a first hanging plate 21 and a second hanging plate 22, arranged symmetrically along the edge frame 2. The first and second hanging plates 21 and 22 are arranged on different surfaces from the first and second hanging ears 4 and 8. The first and second hanging plates 21 and 22 are provided with multiple hanging ears. Each surface of the edge frame 2 is provided with hanging ears for mounting and securing, thereby improving the securement of the battery pack lower case.

[0036] In one embodiment, a first reinforcing rib 14, a second reinforcing rib 15 and a third reinforcing rib 16 are further provided on the bottom plate 1. The first reinforcing rib 14, the second reinforcing rib 15 and the third reinforcing rib 16 are all fixed on the side of the bottom plate 1 where the edge frame 2 is provided. The second reinforcing rib 15 is arranged vertically on the bottom plate 1 to the first reinforcing rib 14 and the third reinforcing rib 16. The first reinforcing rib 14, the second reinforcing rib 15 and the third reinforcing rib 16 divide the area enclosed by the edge frame 2 into a plurality of battery arrangement units. The battery arrangement units are used to accommodate batteries. Dividing the area enclosed by the edge frame 2 into a plurality of battery arrangement units allows each battery arrangement unit to accommodate part of the batteries. When the entire lower box of the battery pack is subjected to vibration or impact, each battery arrangement unit only accommodates part of the batteries, resulting in a smaller total inertia of the batteries in each battery arrangement unit, thereby reducing the probability of the batteries colliding with the inner wall, thereby reducing the impact of vibration or impact on the batteries in the lower box of the battery pack.

[0037] In a second aspect, a battery pack is provided, which includes a battery assembly formed by connecting multiple batteries in series or parallel, an upper cover, and the above-mentioned battery pack lower box, wherein the upper cover is covered on the battery pack lower box to form a storage space for accommodating the battery assembly.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0039] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific embodiments of the present invention are not limited to these descriptions. For those skilled in the art of the present invention, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. A battery pack lower box, characterized in that: The invention comprises an edge frame (2) and a crossbeam (3) provided on one side of a base plate (1), a first hanging ear (4) provided on the outside of the edge frame (2), and an adapter plate (5) provided on the inside of the edge frame (2); the crossbeam (3) is fixedly connected to the base plate (1), both ends of the crossbeam (3) abut against the inside of the edge frame (2), one end of the adapter plate (5) is fixedly connected to the edge frame (2), and the other end is fixedly connected to the crossbeam (3).

2. The battery pack lower box according to claim 1, characterized in that: The adapter plate (5) comprises a first rotating plate (51) and a second rotating plate (52) arranged vertically, the first rotating plate (51) being fixedly connected to the edge frame (2), and the second rotating plate (52) being fixedly connected to the crossbeam (3).

3. The battery pack lower box according to claim 2, characterized in that: A convex rib (53) is provided between the first rotating plate (51) and the second rotating plate (52).

4. The battery pack lower box according to claim 1, characterized in that: A first cooling port (6) and a second cooling port (7) are arranged on the edge frame (2); the bottom plate (1) comprises a first supporting plate (11), a cooling plate (12) and a second supporting plate (13) arranged in sequence from top to bottom; a cooling channel (17) is provided on the cooling plate (12); the first cooling port (6) and the second cooling port (7) are in communication with the cooling channel (17).

5. The battery pack lower box according to claim 4, characterized in that: The cooling channel (17) is formed by the cooling plate (12) being recessed toward the first supporting plate (11).

6. The battery pack lower box according to claim 1, characterized in that: A second hanging ear (8) is provided on a side of the edge frame (2) away from the first hanging ear (4), and the second hanging ear (8) is fixedly connected to the outer side of the edge frame (2).

7. The battery pack lower box according to claim 6, characterized in that: Adapter blocks (9) are provided on both sides of the second hanging ear (8).

8. The battery pack lower box according to claim 6, characterized in that: A first hanging plate (21) and a second hanging plate (22) are further provided on the outside of the edge frame (2) and are symmetrically arranged along the edge frame (2). The arrangement surfaces of the first hanging plate (21) and the second hanging plate (22) are different from the arrangement surfaces of the first hanging ears (4) and the second hanging ears (8). The first hanging plate (21) and the second hanging plate (22) are provided with a plurality of hanging ears.

9. The battery pack lower box according to claim 1, characterized in that: The bottom plate (1) is further provided with a first reinforcing rib (14), a second reinforcing rib (15), and a third reinforcing rib (16); the first reinforcing rib (14), the second reinforcing rib (15), and the third reinforcing rib (16) are used to divide the area enclosed by the edge frame (2) into a plurality of battery arrangement units.

10. A battery pack, characterized in that: The battery pack comprises a battery assembly, an upper cover, and a battery pack lower box according to any one of claims 1 to 9, wherein the upper cover is covered on the battery pack lower box to form a storage space for accommodating the battery assembly.

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