Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and belongs to the technical field of batteries. The battery pack comprises a supporting frame and a bottom plate assembly which are connected, and the supporting frame and the bottom plate assembly are arranged in the height direction of the battery pack and define a containing cavity used for containing the battery module. The bottom plate assembly comprises a first plate body and a first support, the first plate body comprises a first main body part and a first step part, the first step part is connected with the first main body part in a surrounding mode and jointly defines a first sinking groove, the first sinking groove communicates with the containing cavity, and the side, away from the first main body part, of the first step part is connected with the supporting frame; the first support is arranged in the first sinking groove and is used for supporting the battery module; the first main body part and the supporting frame are connected through the first step part, the edge connecting rigidity of the bottom plate assembly is improved, meanwhile, the second sinking groove defined by the first main body part and the supporting frame and the first support arranged in the second sinking groove form a buffering supporting structure, and the buffering and deformation resisting capacity of the bottom plate assembly is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and electrical equipment. Background Technology

[0002] Battery packs typically consist of a support frame and a bottom protective plate, which form a cavity to house and protect the battery modules. However, the bottom protective plate is usually made of steel plate as structural support, which has low structural rigidity and poor impact resistance, resulting in unsatisfactory protective effects. Utility Model Content

[0003] The purpose of this utility model is to provide a battery pack that overcomes the technical problems of low rigidity and poor impact resistance of the bottom structure of current battery packs; this application also provides an electrical device.

[0004] Technical solution: The battery pack disclosed in this application includes a connected support frame and a base plate assembly. The support frame and the base plate assembly are arranged along the height direction of the battery pack and form a receiving cavity for receiving the battery module.

[0005] The base plate assembly includes:

[0006] The first plate includes a first main body and a first stepped part. The first stepped part surrounds and connects to the first main body and together forms a first sink. The first sink communicates with the receiving cavity. The side of the first stepped part away from the first main body is connected to the support frame.

[0007] The first support is disposed in the first sink and is used to support the battery module.

[0008] In some embodiments, the first step portion includes:

[0009] Multiple first steps are arranged along the height direction, and one of the first steps is connected to the first main body. In two adjacent first steps, one first step is connected to the other first step around it. Along the height direction, the first step away from the first main body is located on the side of the other first step that is away from the first main body.

[0010] In some embodiments, the first support has multiple components, each of which is connected to the first main body and protrudes toward the direction of the battery module.

[0011] In some embodiments, the battery pack further includes a liquid cooling plate disposed in the first sink and supported on the first support, and the liquid cooling plate is connected to the battery module.

[0012] In some embodiments, the base plate assembly further includes a buffer structure disposed between the first support and the liquid cooling plate, and respectively connecting the first support and the liquid cooling plate, the buffer structure being made of a buffer material.

[0013] In some embodiments, the base plate assembly further includes:

[0014] The second plate is disposed between the first plate and the support frame. The second plate includes a second main body and a second stepped part. The second stepped part surrounds and connects to the second main body and together forms a second sink. The second sink communicates with the first sink. The second main body is connected to the battery module. The side of the second stepped part away from the second main body is connected to the first stepped part and the support frame respectively.

[0015] In some embodiments, the second step portion includes:

[0016] Multiple second steps are arranged along the height direction, and one second step is connected to the second main body. In two adjacent second steps, one second step surrounds and connects to the other second step. Along the height direction, the second step away from the second main body is located on the side of the other second step opposite to the second main body.

[0017] In some embodiments, the base plate assembly further includes a plurality of second supports disposed in the second sink groove, the plurality of second supports being respectively connected to the second main body portion and protruding toward the direction of the first plate body;

[0018] The base plate assembly also includes a phase change structure, which is disposed in the first sink and / or the second sink and sandwiched between the first support and the second support. The phase change structure is made of a phase change material.

[0019] In some embodiments, the battery pack further includes a liquid cooling plate disposed on the side of the second main body away from the first plate, and connecting the second main body and the battery module respectively.

[0020] This application also discloses an electrical device, including a battery pack as described in the above embodiments.

[0021] Beneficial Effects: The battery pack in this embodiment includes a connected support frame and a base plate assembly. The support frame and the base plate assembly are arranged along the height direction of the battery pack and form a receiving cavity for accommodating the battery module. The base plate assembly includes a first plate and a first support. The first plate includes a first main body and a first stepped portion. The first stepped portion surrounds and connects to the first main body and together forms a first recess. The first recess communicates with the receiving cavity. The side of the first stepped portion opposite to the first main body is connected to the support frame. The first support is disposed in the first recess for supporting the battery module. By connecting the first main body and the support frame through the first stepped portion, the edge connection rigidity of the base plate assembly is improved. At the same time, the second recess formed by the two and the first support provided inside it form a buffer support structure, which improves the buffering and deformation resistance of the base plate assembly.

[0022] The electrical device in this application includes the battery pack described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned battery pack, which will not be repeated here. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an exploded view of the battery pack according to an embodiment of this application;

[0025] Figure 2 This is a three-dimensional structural diagram of the first plate in the battery pack according to an embodiment of this application;

[0026] Figure 3 This is a schematic diagram showing the positional relationship of the battery module, liquid cooling plate, buffer structure, and first plate after an explosion in the battery pack of this application embodiment;

[0027] Figure 4 This is an exploded view of the buffer structure in the battery pack according to an embodiment of this application;

[0028] Figure 5 This is an exploded view of the buffer structure in a battery pack according to another embodiment of this application;

[0029] Figure 6 This is an exploded view of a battery pack according to another embodiment of this application;

[0030] Figure 7 This is a three-dimensional structural diagram of the second plate in the battery pack according to an embodiment of this application;

[0031] Figure 8This is a schematic diagram showing the assembly position relationship between the first plate and the second plate in the battery pack of this application embodiment;

[0032] Reference numerals: 1. Support frame; 2. Base plate assembly; X, height direction; 10. Receiving cavity; 21. First plate; 211. First main body; 212. First stepped part; 213. First sink; 22. First support; 2121. First step; 3. Liquid cooling plate; 23. Buffer structure; 24. Second plate; 241. Second main body; 242. Second stepped part; 243. Second sink; 2421. Second step; 25. Second support; 26. Phase change structure; 231. First buffer part; 232. Support part; 233. Second buffer part; 234. Frame; 4. Battery module. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be understood that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, "multiple" means two or more, and "at least one" can refer to one, two, or more, unless otherwise explicitly specified. The terms "first," "second," and "third," etc., are only for the convenience of description and are used to name parts or embodiments by number, and do not imply any order of importance between the parts or embodiments.

[0035] It should also be noted that in the accompanying drawings of this application, the arrow marked with X is used to indicate the height direction of the battery pack. In the description of this application, the height direction is introduced to more clearly define the structure and relative positional relationship of each component in the battery pack and electrical equipment.

[0036] As a preliminary description of the embodiments of this application, a battery pack typically includes a support frame and a bottom protective plate to form a receiving cavity for housing and protecting the battery module. However, the bottom protective plate is usually made of steel plate as structural support, which has low structural rigidity and poor impact resistance, resulting in unsatisfactory protection. At the same time, steel plate material has poor thermal insulation performance, poor energy absorption effect, and is prone to deformation and abnormal noise.

[0037] In view of this, embodiments of this application provide a battery pack aimed at solving at least one of the above-mentioned technical problems.

[0038] Please see Figures 1 to 2 As shown in the figure, a battery pack according to an embodiment of this application includes a connected support frame 1 and a base plate assembly 2. The support frame 1 and the base plate assembly 2 are arranged along the height direction X of the battery pack and form a receiving cavity 10 for receiving a battery module 4. It should be understood that the battery pack of this application achieves support and encapsulation of the battery module 4 through the support frame 1 and the base plate assembly 2. The base plate assembly 2 includes a first plate body 21 and a first support 22. The first plate body 21 includes a first main body portion 211 and a first stepped portion 212. The first stepped portion 212 surrounds and connects to the first main body portion 211 and together forms a first recess 213. The first recess 213 communicates with the receiving cavity 10. The side of the first stepped portion 212 facing away from the first main body portion 211 is connected to the support frame 1. The first support 22 is disposed in the first recess 213 for supporting the battery module 4. This application supports the battery module 4 using a base plate assembly 2. Specifically, the edge of the first plate 21 is designed as a stepped structure to increase the elastic deformation capability of the first plate 21 along the height direction X, thereby generating an energy absorption effect and improving its resistance to deformation, thus further enhancing the connection stiffness of the edge of the base plate assembly 2. Simultaneously, a first recess 213 is formed by the first main body 211 and the first stepped portion 212, and a first support 22 is provided within the first recess 213. The first support 22 is supported by a buffer material, providing the necessary support for the battery module 4 while also having a certain buffering and energy absorption effect, further improving the deformation resistance of the base plate assembly 2. The double buffer structure 23 of the first stepped portion 212 and the first support 22, using a negative pre-compression assembly method, helps reduce the assembly tolerance between the first plate 21 and the support frame 1, and effectively improves the problem of abnormal noise at the bottom of the base plate assembly 2.

[0039] Please see Figure 1 , Figure 2 and cooperate Figure 8As shown, in some embodiments, the first step portion 212 includes a plurality of first steps 2121 arranged along the height direction X, and one first step 2121 is connected to the first main body portion 211. In two adjacent first steps 2121, one first step 2121 surrounds and connects to the other first step 2121, and along the height direction X, the first step 2121 away from the first main body portion 211 is located on the side of the other first step 2121 opposite to the first main body portion 211. That is, the first step portion 212 protrudes relative to the first main body portion 211 toward the side closer to the support frame 1 and forms a step surface connected to the support frame 1. The plurality of first steps 2121 can form a plurality of step surfaces facing the support frame 1 and are arranged along the height direction X to form a stepped structure. It should be understood that, in this embodiment, by setting multiple first steps 2121, the structural stiffness of the edge of the base plate assembly 2 can be improved, ensuring the stability of the connection between the edge of the base plate assembly 2 and the support frame 1, further increasing the ability of the first plate 21 to generate elastic deformation along the height direction X, and adopting the negative pre-compression assembly method is more conducive to reducing the assembly tolerance between the first plate 21 and the support frame 1.

[0040] It should be noted that in the arrangement of the multiple first steps 2121 in this application, the first step 2121 closer to the first main body 211 is located inside the relatively distant first step 2121. In other embodiments, in two adjacent first steps 2121, one first step 2121 surrounds and connects to the other first step 2121, and the orthographic projections of the multiple first steps 2121 in the direction perpendicular to the height X are all located on the first main body 211.

[0041] Please see Figure 2 As shown, in some embodiments, there are multiple first supports 22, all of which are connected to the first main body 211 and protrude toward the direction of the battery module 4. The first supports 22 are made of cushioning material and are usually designed as solid or honeycomb structures, which have good impact resistance and energy absorption effects.

[0042] Please see Figure 3 As shown, in some embodiments, the battery pack further includes a liquid cooling plate 3, which is disposed within the first sink 213 and supported on the first support 22. The liquid cooling plate 3 is connected to the battery module 4. When the battery pack receives an external impact force, the first sink 213 provides the first support 22 with a buffer deformation space, which improves the energy absorption effect and can better protect the flow channel of the liquid cooling plate 3 and the battery module 4.

[0043] Please see Figure 3As shown, in some embodiments, the base plate assembly 2 further includes a buffer structure 23, which is disposed between the first support 22 and the liquid cooling plate 3, and connects the first support 22 and the liquid cooling plate 3 respectively. The buffer structure 23 is made of a buffer material. In this embodiment, the buffer structure 23 can play a balancing role, better dispersing the opposing pressure on the liquid cooling plate 3, ensuring the deformation stability of the first support 22, and preventing the first support 22 from bending and misaligning, which would affect the support for the battery module 4 and the liquid cooling plate 3. In some embodiments, the buffer structure 23 includes a first buffer portion 231, a support portion 232, and a second buffer portion 233 arranged along the height direction X. It should be understood that the buffer structure 23 can generally be in the form of a composite board, adopting a three-layer composite structure. The first buffer part 231 and the second buffer part 233 are made of soft materials, which can be the same material or different materials. Generally, the back of the substrate such as polypropylene (PP), polyester (PET), or polyamide (PA) is covered with pressure-sensitive adhesive tape (PSA). The support part 232 is made of rigid material, generally steel, aluminum, or other materials with high rigidity and strength to ensure support. The three-layer structure is formed by adhesive bonding or molding. In other embodiments, the outer layer of the buffer structure 23 is made of a rigid material, and the middle layer is made of a soft material, but generally a soft material with high rigidity. The middle layer is made of a soft material, and its internal structure can be made of materials such as aramid, aluminum foam, high-density microporous polypropylene (PP), ethylene propylene rubber (EPDM), etc. The structure is generally a high-energy-absorbing figure-eight structure with an inclination angle of 30-60 degrees. This ensures that it can deform and absorb energy when subjected to bottom impact, thereby improving the thermal insulation performance of the entire battery pack. The upper layer is made of a rigid material to ensure good rigidity at the bonding joint of the battery module 4 and to ensure the balanced force on the cells. The lower layer is made of either a rigid or soft material, and its main function is to absorb the first impact from the bottom of the base plate assembly 2 and further reduce the force on the middle layer. The entire structure adopts a progressive force transmission mode to ensure the rigidity and energy absorption function of the entire base plate assembly 2.

[0044] More specifically, the first buffer section 231 has a thickness of a mm, the support has a thickness of b mm, the second buffer section 233 has a thickness of c mm, and the buffer structure 23 has a thickness of d mm, satisfying 0.2≤b / d≤0.3, 0.4≤a / d≤0.5, and 0.2≤c / d≤0.3. The relatively high thickness of the first buffer section 231 is to support the rigidity of the battery cell module, while the second buffer section 233 mainly serves as the first line of safety protection and energy absorption at the bottom of the base plate assembly 2.

[0045] Please see Figure 4 As shown, in some embodiments, the support portion 232 is surrounded by a frame 234, which is made of a cushioning material.

[0046] Please see Figure 6 and Figure 7 As shown, in some embodiments, the base plate assembly 2 further includes a second plate 24, which is disposed between the first plate 21 and the support frame 1. The second plate 24 includes a second main body 241 and a second stepped portion 242. The second stepped portion 242 surrounds and connects to the second main body 241, forming a second recess 243. The second recess 243 communicates with the first recess 213. The second main body 241 is connected to the battery module 4. The side of the second stepped portion 242 facing away from the second main body 241 is connected to the first stepped portion 212 and the support frame 1, respectively. It should be understood that in this embodiment, the second plate 24 and the first plate 21 are mirror-oriented on a plane perpendicular to the height direction X. The second main body 241 can be embedded inside the receiving cavity 10. The second stepped portion 242 forms a stepped surface connected to the support frame 1. The outer edge of the second stepped portion 242 is sandwiched between the outer edge of the first stepped portion 212 and the support frame 1. The first settling tank 213 is connected to the second settling tank 243 and forms a sealed chamber, which further improves the thermal insulation and stress buffering capacity of the base plate assembly 2.

[0047] Please see Figure 6 and Figure 7 and cooperate Figure 8 As shown, in some embodiments, the second step portion 242 includes a plurality of second steps 2421 arranged along the height direction X, with one second step 2421 connected to the second main body portion 241. In two adjacent second steps 2421, one second step 2421 surrounds and connects to the other second step 2421, and along the height direction X, the second step 2421 away from the second main body portion 241 is located on the side of the other second step 2421 facing away from the second main body portion 241. That is, the plurality of second steps 2421 can form a plurality of stepped surfaces facing the support frame 1 and arranged along the height direction X to form a stepped structure. It should be understood that, in this embodiment, by setting a plurality of second steps 2421, the structural stiffness of the edge of the base plate assembly 2 can be improved, ensuring the stability of the connection between the edge of the base plate assembly 2 and the support frame 1, further increasing the ability of the second plate 24 to generate elastic deformation along the height direction X, and adopting a negative pre-compression assembly method, which is more conducive to reducing the assembly tolerance generated between the second plate 24 and the support frame 1.

[0048] Please see Figures 6 to 8As shown, in some embodiments, the base plate assembly 2 further includes a plurality of second supports 25 disposed within the second sink trough 243. The plurality of second supports 25 are respectively connected to the second main body 241 and protrude toward the direction of the first plate 21. The base plate assembly 2 also includes a phase change structure 26 disposed within the first sink trough 213 and / or the second sink trough 243, and sandwiched between the first support 22 and the second support 25. The phase change structure 26 is made of a phase change material. The second supports 25 are made of a cushioning material and are typically designed as a solid structure or a honeycomb structure, providing good impact resistance and energy absorption. It should be understood that by setting a phase change structure 26 in the sealed cavity formed by the connection between the first sink 213 and the second sink 243, the phase change structure 26 can be one or more layers, depending on the actual performance requirements. Heat exchange can be carried out on the battery module 4 to achieve cooling and temperature uniformity, thereby improving the heat preservation capability of the bottom plate assembly 2. At the same time, the first plate 21, the second plate 24 and the phase change structure 26 form a sandwich structure, which can effectively protect the bottom of the plate assembly.

[0049] In some embodiments, the battery pack further includes a liquid cooling plate 3, which is disposed on the side of the second main body 241 opposite to the first plate 21, and connects the second main body 241 and the battery module 4 (not shown in the figure). When the battery pack receives an external impact force, both the first stepped portion 212 and the second stepped portion 242 can provide buffer deformation, improve the energy absorption effect, and better protect the flow channel of the liquid cooling plate 3 and the battery module 4.

[0050] This application also discloses an electrical device, including a battery pack as described in the above embodiments.

[0051] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0052] The battery pack and electrical equipment provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, It includes a connected support frame and a base plate assembly, the support frame and the base plate assembly are arranged along the height direction of the battery pack and form a receiving cavity for receiving the battery module; The base plate assembly includes: The first plate includes a first main body and a first stepped part. The first stepped part surrounds and connects to the first main body and together forms a first sink. The first sink communicates with the receiving cavity. The side of the first stepped part away from the first main body is connected to the support frame. The first support is disposed in the first sink and is used to support the battery module.

2. The battery pack according to claim 1, characterized in that, The first step section includes: Multiple first steps are arranged along the height direction, and one of the first steps is connected to the first main body. In two adjacent first steps, one first step is connected to the other first step around it. Along the height direction, the first step away from the first main body is located on the side of the other first step that is away from the first main body.

3. The battery pack according to claim 1, characterized in that, The first support has multiple components, all of which are connected to the first main body and protrude toward the direction of the battery module.

4. The battery pack according to claim 3, characterized in that, The battery pack also includes a liquid cooling plate, which is disposed in the first sink and supported on the first support, and the liquid cooling plate is connected to the battery module.

5. The battery pack according to claim 4, characterized in that, The base plate assembly further includes a buffer structure, which is disposed between the first support and the liquid cooling plate and connects the first support and the liquid cooling plate respectively. The buffer structure is made of a buffer material.

6. The battery pack according to claim 1, characterized in that, The base plate assembly also includes: The second plate is disposed between the first plate and the support frame. The second plate includes a second main body and a second stepped part. The second stepped part surrounds and connects to the second main body and together forms a second sink. The second sink communicates with the first sink. The second main body is connected to the battery module. The side of the second stepped part away from the second main body is connected to the first stepped part and the support frame respectively.

7. The battery pack according to claim 6, characterized in that, The second step section includes: Multiple second steps are arranged along the height direction, and one second step is connected to the second main body. In two adjacent second steps, one second step surrounds and connects to the other second step. Along the height direction, the second step away from the second main body is located on the side of the other second step opposite to the second main body.

8. The battery pack according to claim 6, characterized in that, The base plate assembly also includes a plurality of second supports disposed in the second sink groove. The plurality of second supports are respectively connected to the second main body and protrude toward the direction of the first plate. The base plate assembly also includes a phase change structure, which is disposed in the first sink and / or the second sink and sandwiched between the first support and the second support. The phase change structure is made of a phase change material.

9. The battery pack according to claim 6, characterized in that, The battery pack also includes a liquid cooling plate, which is disposed on the side of the second main body away from the first plate and connects the second main body and the battery module respectively.

10. An electrical appliance, characterized in that, Includes a battery pack as described in any one of claims 1 to 9 above.

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