Battery pack, energy storage device and electric equipment

Abstract

The embodiment of the invention relates to the field of energy storage, and provides a battery pack, an energy storage device and electric equipment, the battery pack comprises: a box cover comprising a plurality of side plates and a cover plate, the plurality of side plates enclosing to form an accommodating space with two open ends; the cover plate covers one opening of the containing space and comprises a first plate body and a second plate body, and the first plate body and the second plate body are arranged at intervals in the direction parallel to the side plates; the first honeycomb structure is clamped between the first plate body and the second plate body, and the first honeycomb structure comprises a plurality of honeycomb units which are adjacently connected in the direction parallel to the cover plate; and the box cover is buckled and connected to the box body. The battery pack provided by the embodiment of the invention at least can improve the structural safety of the battery pack.

Description

Technical Field

[0001] This application relates to the field of energy storage, and in particular to a battery pack, energy storage device, and electrical equipment. Background Technology

[0002] The existing battery pack cover has insufficient cushioning and shock absorption capacity, making it difficult to effectively absorb loads under vibration or impact conditions. At the same time, the gas generated inside the box tends to accumulate in local areas, resulting in low structural safety of the battery pack. Summary of the Invention

[0003] This application provides a battery pack, an energy storage device, and an electrical appliance, which at least helps to improve the structural safety of the battery pack.

[0004] According to some embodiments of this application, one aspect of this application provides a battery pack, including: a cover, including a plurality of side plates and a cover plate, the plurality of side plates enclosing an accommodating space with openings at both ends; the cover plate covering one of the openings of the accommodating space, the cover plate including a first plate and a second plate, the first plate and the second plate being arranged at intervals along a direction parallel to the side plates; a first honeycomb structure sandwiched between the first plate and the second plate, the first honeycomb structure including a plurality of honeycomb cells adjacent to each other along a direction parallel to the cover plate; and a housing, the cover being fastened and connected to the housing.

[0005] In some embodiments, the battery pack further includes a second honeycomb structure, and at least one of the side panels has the second honeycomb structure.

[0006] In some embodiments, each of the side panels has a flange structure, and the flange structure is provided with a plurality of mounting holes.

[0007] In some embodiments, the cross-sectional shape of the cellular cell in the direction perpendicular to the side plate is hexagonal or triangular.

[0008] In some embodiments, the cellular cell includes a sidewall structure parallel to the direction of the side plate, the sidewall structure including a plurality of opening structures, and the plurality of cellular cells communicating with each other through the opening structures.

[0009] In some embodiments, at least one vent hole is provided on the plate of the box cover near the box body.

[0010] In some embodiments, the vent hole is circular, and the diameter of the vent hole is 20-32 mm.

[0011] In some embodiments, the height of the sidewall structure of the cellular cell is 10-20 mm in a direction parallel to the side plate.

[0012] According to some embodiments of this application, another aspect of this application provides an energy storage device, the energy storage device including any of the battery packs described above, the energy storage device being used to store electrical energy.

[0013] According to some embodiments of this application, in another aspect, this application provides an electrical device, the electrical device including any of the battery packs described above, the electrical device being used to provide electrical energy.

[0014] The technical solution provided in this application has at least the following advantages: By setting a double-layer structure in the cover and sandwiching a first honeycomb structure between the first and second plates, the cover forms a honeycomb sandwich structure. On the one hand, the buffering characteristics of the honeycomb structure in the thickness direction are utilized to improve the cover's ability to absorb vibration and impact loads, thereby significantly improving the cover's buffering and shock absorption performance. On the other hand, the honeycomb structure is composed of multiple adjacent honeycomb units, which can form multi-directional pathways inside the cover, allowing the gas generated inside the battery pack to be diverted and pressure-equalized within the honeycomb structure, preventing gas accumulation in local areas, reducing transient pressure concentration inside the battery pack, and thus improving the overall safety and reliability of the battery pack structure. Simultaneously, this solution achieves gas diversion and pressure equalization through the honeycomb sandwich structure, eliminating the need for an explosion-proof valve on the cover to meet the pressure relief and safety requirements of the battery pack, thereby simplifying the cover structure and improving system reliability. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional art, the drawings used in the embodiments will be briefly introduced below. Obviously, the 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.

[0016] Figure 1 This is a schematic diagram of the structure of a battery pack cover according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of another battery pack cover provided according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of a cellular cell structure according to an embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the gas flow path in the battery pack cover and honeycomb structure according to an embodiment of this application.

[0020] The above figures include the following reference numerals:

[0021] 10. First side plate; 11. Second side plate; 12. Third side plate; 13. Fourth side plate; 20. Cover plate; 30. First plate body; 40. Second plate body; 50. Vent hole; 60. Side wall structure; 70. Opening structure. Detailed Implementation

[0022] As is known from the background art, the existing battery pack cover has insufficient cushioning and shock absorption capacity, and the gas generated inside the box is prone to accumulate in local areas, resulting in low structural safety of the battery pack. In order to solve the above technical problems, this application provides a battery pack, an energy storage device and an electrical device.

[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0026] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0027] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0028] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0029] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0030] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0031] The terminology used in the description of the various embodiments described herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "foreword" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0032] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0033] This embodiment provides a battery pack, such as Figure 1 and Figure 2 As shown, it includes:

[0034] The lid includes multiple side panels and a cover plate 20, with the multiple side panels enclosing an accommodating space with openings at both ends;

[0035] Optionally, the side plate in this embodiment includes a first side plate 10, a second side plate 11, a third side plate 12 and a fourth side plate 13, which together enclose an accommodating space for accommodating the battery cell.

[0036] The cover plate 20 covers one of the openings of the accommodating space. The cover plate 20 includes a first plate 30 and a second plate 40, which are arranged at intervals along a direction parallel to the side plate 10.

[0037] A first honeycomb structure is sandwiched between the first plate 30 and the second plate 40. The first honeycomb structure includes a plurality of honeycomb cells that are adjacent to each other along a direction parallel to the cover plate 20.

[0038] Optionally, the distance between the first plate 30 and the second plate 40 is equal to the height of the first honeycomb structure.

[0039] The box body, and the box cover is fastened and connected to the box body.

[0040] Optionally, the aforementioned cover is made of aluminum alloy, which can reduce the weight of the battery pack cover while also improving the strength of the battery pack cover and its resistance to external mechanical loads.

[0041] In the above embodiments, by setting a double-layer structure in the cover and sandwiching a first honeycomb structure between the first and second plates, the cover forms a honeycomb sandwich structure. On the one hand, the buffering characteristics of the honeycomb structure in the thickness direction are utilized to improve the cover's ability to absorb vibration and impact loads, thereby significantly improving the cover's buffering and shock absorption performance. On the other hand, the honeycomb structure, composed of multiple adjacent honeycomb units, can form multi-directional pathways inside the cover, allowing the gas generated inside the battery pack to be diverted and pressure-equalized within the honeycomb structure, preventing gas accumulation in local areas, reducing transient pressure concentration inside the battery pack, and thus improving the overall safety and reliability of the battery pack structure. Simultaneously, this solution achieves gas diversion and pressure equalization through the honeycomb sandwich structure, eliminating the need for an explosion-proof valve on the cover to meet the pressure relief and safety requirements of the battery pack, thereby simplifying the cover structure and improving system reliability.

[0042] In this embodiment, the first side plate 10, the second side plate 11, the third side plate 12, and the fourth side plate 13 can be fixedly connected by welding or adhesive. In other embodiments, the number of side plates can be set to other numbers, so that multiple side plates can be arranged to form other shaped accommodating spaces, so that the cover of the battery pack is not limited to square cells.

[0043] In one alternative embodiment, the battery pack further includes a second honeycomb structure, and at least one of the side panels has the second honeycomb structure.

[0044] Specifically, the aforementioned side panel has a surface facing the interior space of the box and a surface facing away from the interior space of the box. The second honeycomb structure is disposed on the side of the side panel facing the interior space of the box, that is, on the inner side of the box lid. The second honeycomb structure may be disposed on only one side panel or on multiple side panels.

[0045] By incorporating a honeycomb structure on at least one side panel, the side panel gains cushioning and load-bearing capacity, thereby enhancing the overall structural strength and impact resistance of the lid.

[0046] In another alternative, each of the aforementioned side panels has a flange structure with multiple mounting holes.

[0047] Specifically, the aforementioned mounting holes can be detachably connected to the battery pack cover using fasteners such as bolts and screws, thereby facilitating the assembly, disassembly, and maintenance of the cover.

[0048] In the above embodiments, by providing assembly holes on the side plate flange, the lid and the box body can be quickly and reliably assembled and connected, thereby improving the connection strength and assembly stability.

[0049] In some exemplary embodiments, the cross-sectional shape of the aforementioned cellular cell in the direction perpendicular to the aforementioned side plate is hexagonal or triangular.

[0050] Specifically, the cross-sectional shape of the cellular unit can also be other polygonal or circular structures, and the specific shape can be selected and set according to the structural strength, processing technology and spatial layout requirements.

[0051] In the above embodiments, setting the cross-section of the cellular unit in the direction perpendicular to the side plate to be hexagonal or triangular is beneficial to improving the stability and load-bearing capacity of the cellular structure and enhancing the space utilization of the structure.

[0052] In some exemplary embodiments, the first honeycomb structure employs differentiated structural parameter configurations in different regions. Specifically, the honeycomb cells near the vent 50 region have a greater sidewall height and / or a greater number of sidewall opening structures 70 than the honeycomb cells far from the vent 50 region, thereby enhancing the conduction and diversion capabilities of gas after entering the cover interlayer. Correspondingly, the honeycomb cells far from the vent 50 region have a smaller sidewall height and / or a smaller number of sidewall opening structures 70 than the corresponding parameters of the honeycomb cells near the vent 50 region, making the sidewall structure 60 of the honeycomb cells in that region relatively complete, thereby improving the buffering and shock absorption performance and load-bearing capacity. Through the above-mentioned zoning configuration, the gas conduction capacity and structural load-bearing capacity can be synergistically optimized while ensuring the overall structural strength of the cover.

[0053] In other exemplary embodiments, such as Figure 3 As shown, the aforementioned cellular unit includes a sidewall structure 60 parallel to the direction of the side plate. The sidewall structure 60 includes a plurality of opening structures 70, and the plurality of aforementioned cellular units are interconnected through the opening structures 70.

[0054] In some embodiments, the opening structure 70 is provided on each sidewall of the cellular cell.

[0055] In the above embodiments, by setting openings in the sidewalls of the cellular cells and connecting adjacent cellular cells, a gas conduction channel is formed, which realizes gas diversion and pressure equalization, reducing the risk of local accumulation. At the same time, the gas collides and deflects multiple times with the sidewalls of the cellular cells during its flow in the cellular structure, which can reduce the instantaneous impact intensity of the airflow and promote the diffusion and transfer of heat, thereby reducing the risk of local heat concentration.

[0056] In some exemplary embodiments, such as Figure 1 As shown, at least one vent 50 is provided on the plate of the box cover near the box body.

[0057] Specifically, the number of exhaust vents 50 can be multiple, for example, two, three or more, to be configured according to the amount of gas generated inside the chamber and the ventilation requirements.

[0058] In the above embodiments, by providing an exhaust port 50 on the side of the box cover near the box body, the gas inside the box body is introduced into the honeycomb structure interlayer for diversion and pressure equalization.

[0059] For example, such as Figure 4 As shown, when gas is generated inside the housing, it can flow along the internal space of the housing towards the lid. The aforementioned exhaust port 50 provides an inlet for the gas to enter the lid's interlayer and guides the gas from inside the housing into the honeycomb structured interlayer. Subsequently, the gas is laterally split and guided between multiple honeycomb units via the aforementioned opening structure 70, thereby forming a multi-directional flow path within the honeycomb structure, achieving gas splitting and pressure equalization. Figure 4 The arrows in the diagram indicate the flow path and direction of the gas inside the box and in the interlayer of the box cover.

[0060] In some other exemplary embodiments, the exhaust port 50 is circular and has a diameter of 20-32 mm.

[0061] In the above embodiments, setting the exhaust hole 50 as circular and limiting its diameter is beneficial to providing stable gas conduction capability while ensuring the structural strength of the box cover, improving the efficiency of gas entering the honeycomb interlayer and reducing the risk of local pressure concentration.

[0062] In one alternative, the height of the sidewall structure 60 of the honeycomb unit is 10-20 mm along a direction parallel to the side plate.

[0063] In the above embodiments, the height of the sidewall of the cellular unit is set to 10-20mm. While taking into account structural strength and weight, this helps to form a stable interlayer buffer and conduction space, thereby improving the shock absorption and gas diversion pressure equalization effect.

[0064] In some exemplary embodiments, at least a portion of the cellular cells of the aforementioned honeycomb structure are provided with flow guiding members or buffering members. Specifically, the buffering members can be configured as flexible sheets or damping materials attached to the inner wall of the cellular cell to absorb the impact energy of the gas as it flows through the cellular cell; the flow guiding members can be configured as flow guiding plates arranged inside the cellular cell to change the flow direction of the gas within the cellular cell, causing the gas to be deflected or flow around. Through the above configuration, the impact of gas impact on the cover structure can be reduced.

[0065] An embodiment of this application also provides an energy storage device, which includes any of the above-described battery packs, and the energy storage device is used to store electrical energy.

[0066] In the above embodiments, by setting a battery pack with a honeycomb sandwich structure in the energy storage device, the energy storage device can have good buffering and shock absorption capabilities and gas diversion and pressure equalization performance while storing electrical energy, thereby improving the structural safety and operational reliability of the energy storage device.

[0067] An embodiment of this application further provides an electrical device, which includes any of the aforementioned battery packs, and the electrical device is used to provide electrical energy.

[0068] In the above embodiments, by incorporating a battery pack with a honeycomb sandwich structure into the electrical equipment, the electrical equipment can provide electrical energy while possessing good buffering and shock absorption capabilities and gas diversion and pressure equalization performance, thereby improving the safety and operational reliability of the electrical equipment.

[0069] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. A battery pack, characterized in that, include: The box lid includes multiple side panels and a cover plate, wherein the multiple side panels enclose an accommodating space with openings at both ends; The cover plate closes to one of the openings of the accommodating space. The cover plate includes a first plate and a second plate, which are spaced apart along a direction parallel to the side plate. A first honeycomb structure is sandwiched between the first plate and the second plate, and the first honeycomb structure includes a plurality of honeycomb cells that are adjacent to each other along a direction parallel to the cover plate. The box body, and the box cover is fastened and connected to the box body.

2. The battery pack according to claim 1, characterized in that, The battery pack also includes a second honeycomb structure, and at least one of the side panels has the second honeycomb structure.

3. The battery pack according to claim 1, characterized in that, Each of the side plates has a flange structure, and the flange structure is provided with multiple mounting holes.

4. The battery pack according to claim 1, characterized in that, The cross-sectional shape of the cellular unit in the direction perpendicular to the side plate is hexagonal or triangular.

5. The battery pack according to claim 1, characterized in that, The cellular unit includes a sidewall structure parallel to the side plate, and the sidewall structure includes multiple opening structures, through which the multiple cellular units are interconnected.

6. The battery pack according to claim 1, characterized in that, At least one vent is provided on the plate of the box cover near the box body.

7. The battery pack according to claim 6, characterized in that, The exhaust port is circular, and its diameter is 20-32mm.

8. The battery pack according to claim 1, characterized in that, Along the direction parallel to the side plate, the height of the sidewall structure of the honeycomb cell is 10-20mm.

9. An energy storage device, characterized in that, The energy storage device includes a battery pack as described in any one of claims 1 to 8, and the energy storage device is used to store electrical energy.

10. An electrical appliance, characterized in that, The electrical device includes a battery pack as claimed in any one of claims 1 to 8, and the electrical device is used to provide electrical energy.

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