Battery bottom protection structure and battery pack

Abstract

The utility model discloses a battery bottom protection structure and a battery pack, the battery bottom protection structure comprises a liquid cooling plate and a bottom protection plate, the bottom protection plate is located at the bottom of the liquid cooling plate, a reinforcing plate is arranged between the liquid cooling plate and the bottom protection plate, the reinforcing plate comprises two reinforcing longitudinal beams and a plurality of reinforcing cross beams connected between the two reinforcing longitudinal beams, and the plurality of reinforcing cross beams are arranged between the two reinforcing longitudinal beams at intervals. According to the battery bottom protection structure disclosed by the utility model, the reinforcing plate is arranged between the liquid cooling plate and the bottom protection plate, the reinforcing plate comprises the two reinforcing longitudinal beams and the plurality of reinforcing cross beams connected between the two reinforcing longitudinal beams, and the reinforcing longitudinal beams and the reinforcing cross beams form a net-shaped structure, so that the stress from all directions is effectively dispersed, and the stress concentration is prevented; the bottom impact resistance of the battery pack is improved; and the reinforcing plate can also be used for increasing the structural strength of the liquid cooling plate and the bottom protection plate, so that the bearing capacity of the liquid cooling plate and the bottom protection plate can be improved, and the reliability and safety of the battery bottom protection structure are improved.

Description

Technical Field

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

[0002] In the related technology, the vehicle is subjected to various bottom impacts during driving. When the bottom impact occurs, the reliability of the battery pack fails, especially the key structural parts fail. For example, when there is large-scale debonding, loosening and breaking of bolts, and cracking of structural parts, the battery cells or modules will be moved and squeezed, causing accelerated damage to related components, resulting in leakage, battery performance degradation, failure of the battery management system, power interruption or fire and explosion accidents, which will affect the reliability of the battery pack. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery bottom protection structure, which effectively disperses stress from all directions, prevents stress concentration, and improves the bottom impact resistance of the battery pack.

[0004] The utility model also provides a battery pack with a battery bottom protection structure.

[0005] According to the battery bottom protection structure of the first aspect embodiment of the utility model, it includes: a liquid cooling plate; a bottom protective plate, the bottom protective plate is located at the bottom of the liquid cooling plate, a reinforcing plate is provided between the liquid cooling plate and the bottom protective plate, the reinforcing plate includes two reinforcing longitudinal beams and a plurality of reinforcing cross beams connected between the two reinforcing longitudinal beams, and the plurality of reinforcing cross beams are arranged at intervals between the two reinforcing longitudinal beams.

[0006] According to the battery bottom protection structure of the embodiment of the utility model, a reinforcement plate is provided between the liquid cooling plate and the bottom protection plate, the reinforcement plate includes two reinforcement longitudinal beams and a plurality of reinforcement cross beams connected between the two reinforcement longitudinal beams, the reinforcement longitudinal beams and the reinforcement cross beams form a mesh structure, which effectively disperses stress from all directions, prevents stress concentration, and improves the bottom impact resistance of the battery pack; the reinforcement plate can also be used to increase the structural strength of the liquid cooling plate and the bottom protection plate, thereby improving the bearing capacity of the liquid cooling plate and the bottom protection plate, and improving the reliability and safety of the battery bottom protection structure.

[0007] According to some embodiments of the utility model, the reinforcing crossbeam has a plurality of supporting bosses protruding toward the liquid cooling plate, and the plurality of supporting bosses are arranged at intervals along the length direction of the reinforcing crossbeam. The lower surface of the liquid cooling plate has a first groove recessed toward the liquid cooling plate, and the supporting boss is located in the first groove for supporting the liquid cooling plate.

[0008] According to some embodiments of the present invention, the liquid cooling plate includes a flow channel area arranged with flow channels and a non-flow channel area not arranged with flow channels, the non-flow channel area is provided with the first groove, and the supporting boss is fixedly connected to the liquid cooling plate in the non-flow channel area.

[0009] According to some embodiments of the present invention, the reinforcing cross beam has an avoidance hole, and the avoidance hole is used to avoid fasteners that fix the battery pack.

[0010] According to some embodiments of the present invention, the lower surface of the liquid cooling plate has a second groove that is recessed toward the liquid cooling plate, and the reinforcing longitudinal beam has a convex rib that cooperates with the second groove.

[0011] According to some embodiments of the present invention, a sealant is provided between the upper surface of the reinforcing longitudinal beam and the lower surface of the liquid cooling plate, for sealing an assembly gap between the reinforcing longitudinal beam and the liquid cooling plate.

[0012] According to some embodiments of the present utility model, a buffer component is provided between the reinforcing plate and the bottom guard plate, and the buffer component is fixedly connected to the reinforcing plate.

[0013] According to some embodiments of the present utility model, the bottom surface of the reinforcing longitudinal beam has an installation groove recessed toward the reinforcing longitudinal beam, and the buffer member is arranged in the installation groove.

[0014] According to some embodiments of the present invention, the reinforcing plate is an integrally formed plastic part.

[0015] The battery pack according to the embodiment of the second aspect of the utility model includes: the battery bottom protection structure according to the embodiment of the first aspect of the utility model.

[0016] According to the battery pack of the embodiment of the utility model, by providing the above-mentioned battery bottom protection structure, stress from all directions is effectively dispersed, stress concentration is prevented, and the bottom impact resistance of the battery pack is improved.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a battery pack according to some embodiments of the utility model;

[0020] Figure 2 yes Figure 1An exploded view of the battery pack in the ;

[0021] Figure 3 is a schematic diagram of a reinforcement plate according to some embodiments of the utility model;

[0022] Figure 4 yes Figure 3 Schematic diagram of the reinforced longitudinal beam.

[0023] Reference numerals:

[0024] 100. Battery pack;

[0025] 11. Top cover; 12. Frame; 121. Mounting cavity; 13. Battery module; 14. Fastener;

[0026] 20. Battery bottom protection structure;

[0027] 2. Liquid cooling plate;

[0028] 3. Reinforced plate; 31. Reinforced crossbeam; 311. Support boss; 312. Avoidance hole; 32. Reinforced longitudinal beam; 321. Convex rib; 322. Mounting groove;

[0029] 4. Bottom guard plate. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] Reference below Figure 1-Figure 4 A battery bottom protection structure 20 according to an embodiment of the present invention is described.

[0034] According to the battery bottom protection structure 20 of the first aspect embodiment of the utility model, it includes a liquid cooling plate 2 and a bottom protection plate 4, the bottom protection plate 4 is located at the bottom of the liquid cooling plate 2, and a reinforcing plate 3 is provided between the liquid cooling plate 2 and the bottom protection plate 4, the reinforcing plate 3 includes two reinforcing longitudinal beams 32 and a plurality of reinforcing cross beams 31, and the plurality of reinforcing cross beams 31 are connected between the two reinforcing longitudinal beams 32, that is, one end of the reinforcing cross beam 31 is connected to one of the reinforcing cross beams 31, and the other end of the reinforcing cross beam 31 is connected to the other reinforcing cross beam 31, and the plurality of reinforcing cross beams 31 are arranged at intervals between the two reinforcing longitudinal beams 32.

[0035] The two reinforcing longitudinal beams 32 are usually arranged along the length direction of the bottom guard plate 4, mainly providing longitudinal support force; the multiple reinforcing cross beams 31 are laterally staggered and connected between the two reinforcing longitudinal beams 32, mainly providing lateral support force, and playing a supporting role in the side column collision condition. The reinforcing longitudinal beams 32 and the reinforcing cross beams 31 form a mesh structure, which effectively disperses stress from all directions and prevents stress concentration, thereby improving the compressive strength of the battery bottom protection structure 20 of the battery pack 100, avoiding deformation of the bottom guard plate 4 when the bottom guard plate 4 is hit by the bottom, and improving the bottom impact resistance of the battery pack 100.

[0036] The battery pack 100 includes a frame 12, a top cover 11 and a battery module 13. The frame 12 defines an installation cavity 121, the battery module 13 is located in the installation cavity 121, the top cover 11 is disposed above the frame 12, and the battery bottom protection structure 20 is located below the frame 12 to provide support for the battery module 13. The reinforcing plate 3 is located between the liquid cooling plate 2 and the bottom protection plate 4, and can be used to increase the structural strength of the liquid cooling plate 2 and the bottom protection plate 4, thereby improving the bearing capacity of the liquid cooling plate 2 and the bottom protection plate 4, and improving the reliability and safety of the battery bottom protection structure 20.

[0037] According to the battery bottom protection structure 20 of the embodiment of the utility model, a reinforcing plate 3 is provided between the liquid cooling plate 2 and the bottom protection plate 4. The reinforcing plate 3 includes two reinforcing longitudinal beams 32 and a plurality of reinforcing cross beams 31 connected between the two reinforcing longitudinal beams 32. The reinforcing longitudinal beams 32 and the reinforcing cross beams 31 form a mesh structure, which effectively disperses stress from all directions, prevents stress concentration, and improves the bottom impact resistance of the battery pack 100. The reinforcing plate 3 can also be used to increase the structural strength of the liquid cooling plate 2 and the bottom protection plate 4, thereby improving the bearing capacity of the liquid cooling plate 2 and the bottom protection plate 4, and improving the reliability and safety of the battery bottom protection structure 20.

[0038] According to some embodiments of the present invention, referring to Figure 3 The reinforcing crossbeam 31 has a plurality of supporting bosses 311, and the plurality of supporting bosses 311 protrude toward the liquid cooling plate 2. The plurality of supporting bosses 311 are arranged at intervals along the length direction of the reinforcing crossbeam 31, so that the force on the liquid cooling plate 2 is evenly distributed after installation, avoiding deformation or damage caused by excessive local pressure.

[0039] The lower surface of the liquid cooling plate 2 has a first groove that is recessed toward the liquid cooling plate 2. The supporting boss 311 is located in the first groove and is used to support the liquid cooling plate 2. It can achieve precise positioning between the liquid cooling plate 2 and the reinforcing beam 31, and can also enhance the contact area and stability between the liquid cooling plate 2 and the reinforcing beam 31, so that the reinforcing beam 31 can better support the liquid cooling plate 2.

[0040] According to some embodiments of the present invention, referring to Figure 2-Figure 3 The liquid cooling plate 2 includes a flow channel area with flow channels and a non-flow channel area without flow channels. The flow channels in the flow channel area contain cooling liquid, which is used to exchange heat for the battery module 13. The non-flow channel area is provided with a first groove, and the support boss 311 is fixedly connected to the liquid cooling plate 2 in the non-flow channel area. The support boss 311 is embedded in the first groove and fixedly connected to the liquid cooling plate 2 in the non-flow channel area, so that the liquid cooling plate 2 can be effectively supported without interfering with the flow of the cooling liquid in the flow channel.

[0041] For example, rivets can be used to connect the support boss 311 and the liquid cooling plate 2 in the non-flow area, and structural glue can be applied at the connection between the support boss 311 and the liquid cooling plate 2 in the non-flow area to increase the sealing of the connection between the support boss 311 and the liquid cooling plate 2 in the non-flow area.

[0042] According to some embodiments of the present invention, referring to Figure 1-Figure 3The reinforcing crossbeam 31 has an avoidance hole 312, which is used to avoid the fastener 14 fixing the battery pack 100. The avoidance hole 312 is a specially reserved avoidance space on the reinforcing crossbeam 31, so that the fastener 14 can pass through the reinforcing crossbeam 31, which can ensure the smooth installation of the fastener 14 and does not hinder the mechanical support and reinforcement of the battery pack 100 provided by the reinforcing crossbeam 31. This structure not only meets the structural strength requirements of the battery pack 100, but also facilitates the actual installation operation, and can also reduce the complexity of the installation process and improve assembly efficiency.

[0043] For example, fasteners 14 are sequentially passed through the top cover 11 , the partition on the frame 12 , the non-flow channel area of ​​the liquid cooling plate 2 , the avoidance hole 312 , and the bottom guard plate 4 to increase the connection strength of the middle part of the battery pack 100 .

[0044] According to some embodiments of the present invention, referring to Figure 2-Figure 3 The lower surface of the liquid cooling plate 2 has a second groove that is recessed toward the liquid cooling plate 2, and the reinforcing longitudinal beam 32 has a convex rib 321 that matches the second groove. When the reinforcing plate 3 is installed at the bottom of the liquid cooling plate 2, the convex rib 321 will be embedded in the second groove, forming a nested connection method, which can not only pre-position the installation position of the reinforcing plate 3, but also prevent the liquid cooling plate 2 from moving or deforming due to vibration, thermal expansion and contraction during the operation of the battery pack 100, resulting in displacement of the reinforcing plate 3, thereby improving the stability of the assembly of the reinforcing plate 3 and the liquid cooling plate 2.

[0045] According to some embodiments of the present invention, referring to Figure 2-Figure 3 A sealant is provided between the upper surface of the reinforcing longitudinal beam 32 and the lower surface of the liquid cooling plate 2 to seal the assembly gap between the reinforcing longitudinal beam 32 and the liquid cooling plate 2, and the reinforcing longitudinal beam 32 can also be fixed to the liquid cooling plate 2; at the same time, a sealant is provided on the outer surface of the rib 321 and the surface of the second groove to further increase the connection reliability between the reinforcing plate 3 and the liquid cooling plate 2. For example, the sealant can be a structural adhesive.

[0046] According to some embodiments of the present invention, referring to Figure 2-Figure 3 A buffer is provided between the reinforcing plate 3 and the bottom guard plate 4. The buffer is fixedly connected to the reinforcing plate 3. For example, the buffer is attached to the reinforcing plate 3 by adhesive, and the buffer is in natural contact with the bottom guard plate 4. The buffer can play a buffering role when the bottom of the battery pack 100 is hit, and the buffer can absorb energy, increase the force area when the battery pack 100 is hit by the bottom, avoid single point or linear contact, avoid stress concentration, and improve the impact resistance of the battery bottom protection structure 20.

[0047] For example, the buffer member may be buffer foam.

[0048] According to some embodiments of the present invention, referring to Figure 3-Figure 4 The bottom surface of the reinforcing longitudinal beam 32 has a mounting groove 322, which is recessed toward the reinforcing longitudinal beam 32. A buffer is provided in the mounting groove 322, for example, the buffer can be attached to the mounting groove 322 by adhesive. The mounting groove 322 is provided on the bottom surface of the reinforcing longitudinal beam 32 toward the reinforcing longitudinal beam 32, which can reduce the weight of the reinforcing plate 3, thereby reducing the cost of the reinforcing plate 3, and the buffer can play a buffering role.

[0049] According to some embodiments of the present invention, referring to Figure 2-Figure 3 The reinforcing plate 3 is an integrally formed plastic part, which can increase the structural strength of the reinforcing plate 3. At the same time, the reinforcing plate 3 is a plastic part, which makes the reinforcing plate 3 light in weight, excellent in environmental protection performance, and high in compressive strength. For example, the reinforcing plate 3 can be a PC material part.

[0050] The battery pack 100 according to the second embodiment of the utility model includes: the battery bottom protection structure 20 according to the first embodiment of the utility model.

[0051] According to the battery pack 100 of the embodiment of the present invention, by providing the battery bottom protection structure 20, stress from all directions is effectively dispersed to prevent stress concentration, thereby improving the bottom impact resistance of the battery pack 100.

[0052] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery bottom protection structure, characterized in that: include: Liquid cooling plate; A bottom guard plate, the bottom guard plate is located at the bottom of the liquid cooling plate, a reinforcing plate is provided between the liquid cooling plate and the bottom guard plate, the reinforcing plate comprises two reinforcing longitudinal beams and a plurality of reinforcing cross beams connected between the two reinforcing longitudinal beams, and the plurality of reinforcing cross beams are arranged at intervals between the two reinforcing longitudinal beams; The reinforcing crossbeam has a plurality of supporting bosses protruding toward the liquid cooling plate, and the plurality of supporting bosses are arranged at intervals along the length direction of the reinforcing crossbeam. The lower surface of the liquid cooling plate has a first groove recessed toward the liquid cooling plate, and the supporting boss is located in the first groove for supporting the liquid cooling plate.

2. The battery bottom protection structure according to claim 1, characterized in that: The liquid cooling plate comprises a flow channel area with flow channels and a non-flow channel area without flow channels, the non-flow channel area is provided with the first groove, and the supporting boss is fixedly connected to the liquid cooling plate in the non-flow channel area.

3. The battery bottom protection structure according to claim 1, characterized in that: The reinforcing cross beam has an avoidance hole, and the avoidance hole is used to avoid fasteners that fix the battery pack.

4. The battery bottom protection structure according to claim 1, characterized in that: The lower surface of the liquid cooling plate has a second groove that is recessed toward the liquid cooling plate, and the reinforcing longitudinal beam has a convex rib that matches the second groove.

5. The battery bottom protection structure according to claim 4, characterized in that: A sealant is provided between the upper surface of the reinforcing longitudinal beam and the lower surface of the liquid cooling plate, and is used to seal an assembly gap between the reinforcing longitudinal beam and the liquid cooling plate.

6. The battery bottom protection structure according to claim 1, characterized in that: A buffer is provided between the reinforcing plate and the bottom guard plate, and the buffer is fixedly connected to the reinforcing plate.

7. The battery bottom protection structure according to claim 6, characterized in that: The bottom surface of the reinforcing longitudinal beam has an installation groove which is recessed toward the reinforcing longitudinal beam, and the buffer member is arranged in the installation groove.

8. The battery bottom protection structure according to claim 1, characterized in that: The reinforcing plate is an integrally formed plastic part.

9. A battery pack, characterized in that: include: The battery bottom protection structure according to any one of claims 1 to 8.

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