Battery pack and electric device

Abstract

The application discloses a battery pack and an electric device, which have a third direction and comprise a box body and a battery cell group. The box body comprises a bottom plate and a side plate. The side plate is arranged around the third direction, and the bottom plate is arranged on one side of the side plate along the third direction. The bottom plate and the side plate are connected to form an accommodating cavity. The battery cell group is arranged in the accommodating cavity. At least one of the side plate and the bottom plate is provided with a filling cavity, and the filling cavity is filled with a non-Newtonian fluid material. The non-Newtonian fluid material is a known material, which has the unique characteristics of being flexible and easy to fill in normal state and being rigid in an instant when being impacted. By arranging the non-Newtonian fluid material in the filling cavities of the bottom plate and the side plate, the box body has the effects of impact prevention and buffering. Compared with a traditional rigid protective material, the probability of stress concentration when being impacted or extruded can be reduced. Compared with a traditional buffering material, the supporting force can be improved, the deformation amount when being impacted or extruded can be reduced, and the battery pack can be prevented from being deformed.

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] In related technologies, the power battery, as a crucial component of electric vehicles, directly impacts the overall vehicle safety. Currently, there are two main types of protective materials for power batteries: rigid protective materials and traditional cushioning materials. Both types have shortcomings, primarily: rigid protective materials (such as metal brackets or metal plates) are prone to causing localized stress concentration in battery cells during collisions or compressions, leading to battery damage; traditional cushioning materials (such as ordinary foam) deform significantly under high-speed impacts, lack sufficient support, and are unable to effectively absorb energy and prevent battery cell deformation. Utility Model Content

[0003] This application aims to provide a battery pack and electrical equipment that can solve the problems of the shortcomings of rigid protective materials and traditional cushioning materials.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a battery pack having a third direction, including a housing and a battery cell assembly. The housing includes a bottom plate and a side plate, the side plate being disposed around the third direction, and the bottom plate being disposed on one side of the side plate along the third direction. The bottom plate and the side plate are connected to enclose and form a receiving cavity, the battery cell assembly being disposed in the receiving cavity, and at least one of the side plate and the bottom plate having a filling cavity, the filling cavity being filled with a non-Newtonian fluid material.

[0005] Optionally, the filling cavity includes a first filling cavity, which is disposed in the side plate.

[0006] Optionally, the side plate includes a plurality of sub-plates, which are arranged around the plurality of battery cells in a third direction, and at least some of the sub-plates are provided with the first filling cavity.

[0007] Optionally, two adjacent sub-boards can be detachably connected.

[0008] Optionally, the multiple sub-plates are integrally formed.

[0009] Optionally, the filling cavity includes a second filling cavity, which is disposed on the base plate.

[0010] Optionally, the first filling cavity and the second filling cavity are either interconnected or independent of each other.

[0011] Optionally, the base plate and the side plate are detachably connected, or The base plate and the side plate are integrally formed.

[0012] Optionally, the system further includes a buffer plate, which includes at least a non-Newtonian fluid material layer. The buffer plate is located on the side of the housing facing the battery cell assembly, and / or on the side of the housing away from the battery cell assembly. The buffer plate is connected to the housing.

[0013] Optionally, the buffer plate is detachably connected to the housing.

[0014] Secondly, embodiments of this application provide an electrical device including the battery pack described in any of the above embodiments.

[0015] In embodiments of this application, the battery pack housing includes a bottom plate and side plates, at least one of which has a filling cavity filled with a non-Newtonian fluid material. When not subjected to external pressure, the molecules within the non-Newtonian fluid material move relatively freely, exhibiting weak connections and a liquid or semi-liquid state. When the non-Newtonian fluid material is subjected to external pressure and undergoes severe deformation, the originally loose molecules concentrate due to the external force (shear thickening), and the connection force between the molecules becomes stronger. Based on the unique characteristics of non-Newtonian fluid materials—"flexible and easy to fill under normal conditions, but instantly rigid upon impact"—this application, by placing non-Newtonian fluid material in the filling cavities of the bottom and side plates, enables the bottom and side plates to simultaneously possess impact resistance and cushioning effects. Compared to traditional rigid protective materials, it can reduce the probability of stress concentration during collisions or compressions; compared to traditional cushioning materials, it can improve support strength and reduce deformation during collisions or compressions, effectively preventing battery pack deformation.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below, wherein: Figure 1 A perspective view of a battery pack provided in an embodiment of this application; Figure 2 An exploded view of a battery pack provided in an embodiment of this application; Figure 3 This is a cross-sectional view of a box body provided in one embodiment of this application; Figure 4 A cross-sectional view of the housing provided in another embodiment of this application; Figure 5 A cross-sectional view of a side panel provided in an embodiment of this application; Figure 6 A cross-sectional view of a side plate provided in another embodiment of this application; Figure 7 An exploded view of a battery pack provided in another embodiment of this application.

[0018] Figure label: 100, housing; 110, receiving cavity; 120, filling cavity; 130, liquid injection hole; 140, bottom plate; 141, second filling cavity; 150, side plate; 151, first filling cavity; 160, sub-plate; 170, buffer plate; 200, cell assembly; 210, cell; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0019] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element 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.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] The battery pack and electrical equipment provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, a battery pack according to some embodiments of this application has a third direction Z, including a housing 100 and a cell assembly 200. The housing 100 includes a bottom plate 140 and a side plate 150. The side plate 150 is disposed around the third direction Z, and the bottom plate 140 is disposed on one side of the side plate 150 along the third direction Z. The bottom plate 140 and the side plate 150 are connected to form a receiving cavity 110. The cell assembly 200 is disposed in the receiving cavity 110. At least one of the side plate 150 and the bottom plate 140 is provided with a filling cavity 120, which is filled with a non-Newtonian fluid material.

[0025] In this embodiment, the battery pack housing 100 includes a bottom plate 140 and a side plate 150. At least one of the side plate 150 and the bottom plate 140 is provided with a filling cavity 120, which is filled with a non-Newtonian fluid material. When the non-Newtonian fluid material is not subjected to external pressure, the movement between its molecules is relatively open, and the molecules are weakly connected. The molecules inside the non-Newtonian fluid material can move relatively freely, exhibiting a liquid or semi-liquid state. When the non-Newtonian fluid material is subjected to external pressure and undergoes severe deformation, the originally loose molecules are concentrated due to the external force (shear thickening), and the connection force between the molecules also becomes strong. Based on the unique characteristics of non-Newtonian fluid materials—"flexible and easy to fill under normal conditions, and instantly rigid upon impact"—this application incorporates non-Newtonian fluid materials within the filling cavities 120 of the base plate 140 and side plate 150. This allows the base plate 140 and side plate 150 to simultaneously provide impact protection and cushioning. Compared to traditional rigid protective materials, this reduces the probability of stress concentration during collisions or compressions. Compared to traditional cushioning materials, this enhances support and reduces deformation during collisions or compressions, effectively preventing battery pack deformation.

[0026] In addition, non-Newtonian fluid materials remain in a flowing or soft state under normal conditions, exhibiting buffering performance. When subjected to sudden and severe impact or compression, they instantly thicken and harden, providing high-strength support and effectively dispersing impact loads, thus exhibiting impact resistance. This reduces the risk of battery pack deformation, short circuits, or rupture, solving the problem of balancing impact resistance and buffering performance.

[0027] Compared to related technologies that improve protection by increasing the thickness of rigid protective structures, the density of non-Newtonian fluid materials is controllable. Furthermore, the inclusion of filling cavities 120 in the base plate 140 and side plates 150 reduces their weight. This significantly reduces the overall weight of the housing 100 while achieving the same or better protection level, thereby lowering the overall mass of the battery pack. When this battery pack is used in electric vehicles, it can increase the driving range of the electric vehicle.

[0028] Among them, such as Figure 1 and Figure 2 As shown, the housing 100 is a structural component that houses the battery cell assembly 200. The housing 100 includes a bottom plate 140 and a side plate 150. The bottom plate 140 and the side plate 150 are connected to enclose and form a receiving cavity 110, into which the battery cell assembly 200 is installed. The bottom plate 140 and the side plate 150 can be made of materials such as aluminum or steel. Of course, the specific materials used to manufacture the bottom plate 140 and the side plate 150 can be flexibly selected according to actual conditions, and this embodiment does not limit this.

[0029] like Figure 3 As shown, at least one of the side plate 150 and the bottom plate 140 is provided with a filling cavity 120, which is filled with a non-Newtonian fluid material. The fact that at least one of the side plate 150 and the bottom plate 140 is provided with a filling cavity 120 can be understood as the filling cavity 120 being provided inside the side plate 150, or inside the bottom plate 140, or both the side plate 150 and the bottom plate 140 being provided with filling cavities 120.

[0030] It should be noted that non-Newtonian fluid materials are existing materials that do not satisfy Newton's law of viscosity, meaning that the relationship between their shear stress and shear strain rate is not linear. Non-Newtonian fluid materials exhibit "shear thickening" characteristics; under high-speed impact, their apparent viscosity changes dramatically, even transforming from a liquid phase to a solid phase, exhibiting the impact resistance of a solid. After the impact force is removed, they can rapidly transform back from a solid phase to a liquid phase, and this change is reversible.

[0031] For example, the non-Newtonian fluid material can be a non-Newtonian fluid with high impact response speed, good temperature stability and low toxicity, such as polyethylene glycol aqueous solution or other modified starch-based materials. Of course, the specific type of non-Newtonian fluid material can be flexibly selected according to the actual situation, and the embodiments of this application do not limit it in this regard.

[0032] In addition, some supporting ribs can be set in the filling cavity 120 to improve the structural strength of the bottom plate 140 and the side plate 150, so that the bottom plate 140 and the side plate 150 have sufficient support and protection capabilities.

[0033] Of course, the battery pack also includes a top cover assembly, which covers the opening of the housing 100 and is electrically connected to the cell assembly 200. The specific structure of the top cover assembly can be flexibly set according to actual conditions, and this application embodiment does not limit it.

[0034] In some embodiments, such as Figure 2 and Figure 3 As shown, the battery pack has a first direction X and a second direction Y that are perpendicular to each other. Both the first direction X and the second direction Y are perpendicular to a third direction Z. The cell assembly 200 includes a plurality of cells 210, which are arranged along the first direction X and / or the second direction Y. It can be understood that the plurality of cells 210 can be arranged along the first direction X, or along the second direction Y, or simultaneously along both directions X and Y, thereby forming the cell assembly 200, which is fixed within the housing 100.

[0035] It should be noted that the first direction X, the second direction Y, and the third direction Z are mutually perpendicular. Specifically, this can be "perpendicular" in the strict sense, for example, the angle between the first direction X and the second direction Y is 90°; or it can be "approximately perpendicular," specifically meaning that the angle between any two of the first direction X, the second direction Y, and the third direction Z includes a certain error. Considering the measurement and the error associated with the measurement of a specific quantity (i.e., the limitations of the measurement system), this error is within the acceptable deviation range for a specific value as determined by a person skilled in the art. For example, the angle between the first direction X and the second direction Y is 90° ± 5°.

[0036] Optionally, such as Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the filling cavity 120 includes a first filling cavity 151, which is disposed on the side plate 150.

[0037] In this embodiment, by providing a first filling cavity 151 in the side panel 150 and filling the first filling cavity 151 with a non-Newtonian fluid material, the side panel 150 can be protected. When the side panel 150 of the housing 100 is impacted, the non-Newtonian fluid material in the first filling cavity 151 can, through its unique characteristics of being "flexible and easy to fill under normal conditions, and instantly rigid upon impact," enable the side panel 150 to simultaneously possess the effects of impact protection and cushioning.

[0038] Specifically, such as Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the filling cavity 120 includes a first filling cavity 151, which is disposed on the side plate 150. One end of the side plate 150 has an injection hole 130, through which a non-Newtonian fluid material can be injected into the first filling cavity 151. After injection, the injection hole 130 can be sealed. For example, the injection hole 130 can be sealed by welding or by using a plug. Of course, the sealing method of the injection hole 130 can be flexibly set according to the actual situation, and this embodiment does not limit this.

[0039] For example, the ratio of the dimension of the first filling cavity 151 along the thickness direction of the side plate 150 to the thickness dimension of the side plate 150 can be between 0.4 and 0.6. As a load-bearing and encapsulation structure, the side plate 150 should ensure sufficient mechanical strength and sealing performance to prevent leakage of non-Newtonian fluid materials or displacement of the cell assembly 200. Moreover, this ratio range ensures both the shock-resistant and cushioning effect of the side plate 150 and avoids the problem of affecting the battery pack's arrangement density due to excessive filling with non-Newtonian fluid materials.

[0040] Optionally, such as Figure 5 and Figure 6 As shown, the side plate 150 includes a plurality of sub-plates 160, which are arranged around the plurality of cells 210 in a third direction Z. At least some of the sub-plates 160 are provided with a first filling cavity 151.

[0041] In this embodiment, by providing a first filling cavity 151 in at least some of the sub-boards 160, the presence or absence of a first filling cavity 151 in each sub-board 160 can be flexibly selected according to the stress conditions at different locations of the battery cell assembly 200 within the battery pack, thereby achieving targeted protection for different locations of the battery cell assembly 200. When the sub-board 160 of the housing 100 is impacted, the non-Newtonian fluid material in the first filling cavity 151, through its unique characteristics of being "flexible and easy to fill under normal conditions, and instantly rigid upon impact," enables the sub-board 160 to simultaneously possess impact resistance and cushioning effects.

[0042] Specifically, such as Figure 5 and Figure 6As shown, the side plate 150 includes multiple sub-plates 160, which are arranged around the multiple battery cells 210 in a third direction Z. The multiple sub-plates 160 are connected in sequence to form the side plate 150. At least some of the sub-plates 160 are provided with a first filling cavity 151, which can protect the sub-plates 160.

[0043] Optionally, the multiple sub-boards 160 are separate structures, and two adjacent sub-boards 160 can be detachably connected.

[0044] In this embodiment of the application, by setting multiple sub-boards 160 as separate structures and detachably connecting them, the processing and manufacturing difficulty of the sub-boards 160 is reduced. Moreover, if a sub-board 160 is damaged, only the corresponding one needs to be replaced, without the need for overall replacement, thus reducing the later maintenance cost.

[0045] Optionally, multiple sub-plates 160 are integrally molded structures.

[0046] In this embodiment, by integrally forming multiple sub-boards 160, there is no need for subsequent assembly between the sub-boards 160, thereby reducing assembly steps and improving assembly efficiency.

[0047] Optionally, such as Figure 3 and Figure 4 As shown, the filling cavity 120 includes a second filling cavity 141, which is disposed on the base plate 140.

[0048] In this embodiment, by providing a second filling cavity 141 in the base plate 140, and filling the second filling cavity 141 with a non-Newtonian fluid material, the base plate 140 can be protected. When the base plate 140 of the housing 100 is impacted, the non-Newtonian fluid material in the second filling cavity 141, through its unique characteristics of being "flexible and easy to fill under normal conditions, and instantly rigid upon impact," enables the base plate 140 to simultaneously possess impact resistance and cushioning effects.

[0049] Specifically, such as Figure 3 and Figure 4 As shown, the filling cavity 120 includes a second filling cavity 141, which is disposed on the base plate 140. One end of the base plate 140 has an injection hole 130, through which a non-Newtonian fluid material can be injected into the second filling cavity 141. After injection, the injection hole 130 can be sealed. For example, the injection hole 130 can be sealed by welding or by using a plug. Of course, the sealing method of the injection hole 130 can be flexibly set according to the actual situation, and this embodiment does not limit this.

[0050] Optionally, such as Figure 3 As shown, the first filling cavity 151 and the second filling cavity 141 are independent of each other.

[0051] In this embodiment, by configuring the first filling cavity 151 and the second filling cavity 141 as independent structures and providing corresponding injection holes 130, non-Newtonian fluid materials can be injected into the first filling cavity 151 and the second filling cavity 141 simultaneously through multiple injection holes 130, resulting in a faster injection speed. Furthermore, the specific locations of the first filling cavity 151 and the second filling cavity 141 can be flexibly set according to the stress conditions at different locations within the battery cell assembly 200, thereby achieving targeted protection for different locations of the battery cell assembly 200.

[0052] Optionally, such as Figure 4 As shown, the first filling cavity 151 and the second filling cavity 141 are interconnected.

[0053] In this embodiment, the first filling cavity 151 and the second filling cavity 141 are configured to be interconnected. By providing an injection hole 130 in the first filling cavity 151 or the second filling cavity 141, the first filling cavity 151 and the second filling cavity 141 can be injected simultaneously through the injection hole 130. The structure is simple and the injection operation is convenient.

[0054] Specifically, such as Figure 3 and Figure 4 As shown, the first filling cavity 151 and the second filling cavity 141 are independent of each other or interconnected. Of course, the specific connection relationship between the first filling cavity 151 and the second filling cavity 141 can be flexibly set according to the actual situation, and this embodiment does not limit this.

[0055] Optionally, such as Figure 5 As shown, the base plate 140 and the side plate 150 are detachably connected.

[0056] In this embodiment, the base plate 140 and the side plate 150 are detachably connected. When one of the base plate 140 and the side plate 150 is damaged, only the corresponding part needs to be replaced, instead of replacing the entire plate, thus reducing costs. Alternatively, the base plate 140 and the side plate 150 can be machined separately, reducing machining difficulty.

[0057] Specifically, the base plate 140 and the side plate 150 are detachably connected, for example, by bolts. The base plate 140 has through holes, and the side plate 150 has threaded holes. The connection between the base plate 140 and the side plate 150 is achieved by bolts. The first filling cavity 151 in the side plate 150 and the second filling cavity 141 in the base plate 140 are independent of each other. Both the side plate 150 and the base plate 140 have injection holes 130 to inject non-Newtonian fluid material into the first filling cavity 151 and the second filling cavity 141, respectively. Alternatively, the first filling cavity 151 in the side plate 150 and the second filling cavity 141 in the base plate 140 can be interconnected, which can be achieved by a sealing structure to prevent leakage during injection.

[0058] Optionally, such as Figure 6 As shown, the base plate 140 and the side plate 150 are integrally formed structures.

[0059] In this embodiment, the base plate 140 and the side plate 150 are integrally formed. The base plate 140 and the side plate 150 are manufactured in one piece, eliminating the need for subsequent assembly processes, resulting in fewer steps and higher assembly efficiency. In addition, the integrally formed structure can improve the connection strength between the base plate 140 and the side plate 150, and there is no need to consider the sealing problem between the base plate 140 and the side plate 150.

[0060] Specifically, the base plate 140 and the side plate 150 are integrally formed. The first filling cavity 151 in the side plate 150 and the second filling cavity 141 in the base plate 140 are interconnected. An injection hole 130 can be provided in either the side plate 150 or the base plate 140 to fill the first filling cavity 151 and the second filling cavity 141 with a non-Newtonian fluid material. Alternatively, the first filling cavity 151 in the side plate 150 and the second filling cavity 141 in the base plate 140 can be independent of each other. Both the side plate 150 and the base plate 140 are provided with injection holes 130 to inject non-Newtonian fluid material into the first filling cavity 151 and the second filling cavity 141, respectively.

[0061] It should be noted that the specific connection form between the base plate 140 and the side plate 150 can be flexibly set according to the actual situation, and this application embodiment does not limit it.

[0062] Optionally, such as Figure 7 As shown, the battery pack also includes a buffer plate 170, which includes at least a non-Newtonian fluid material layer. The buffer plate 170 is disposed on the side of the housing 100 facing the cell assembly 200, or on the side of the housing 100 away from the cell assembly 200, or simultaneously on both the side of the housing 100 facing the cell assembly 200 and the side of the housing 100 away from the cell assembly 200. The buffer plate 170 is connected to the housing 100.

[0063] In this embodiment, by providing a buffer plate 170 on the housing 100, the buffer plate 170 comprising at least a non-Newtonian fluid material layer, can further improve the impact resistance and cushioning effect of the housing 100 through its unique characteristics of being "flexible and easy to fill under normal conditions, and instantly rigid upon impact."

[0064] Furthermore, the buffer plate 170 can directly contact the cell assembly 200. By controlling the shape of the buffer plate 170, its shape can be matched to the shape of the cell assembly 200, ensuring a good fit. This allows the buffer plate 170 to be used with irregularly shaped cell assemblies 200, eliminating weak areas in the protection of the casing 100. Moreover, the buffer plate 170 possesses certain damping and heat insulation properties, helping to delay the spread of thermal runaway and improving the overall safety and lifespan of the battery pack.

[0065] Specifically, the buffer plate 170 includes at least a non-Newtonian fluid material layer, which is made of a Newtonian fluid material. Because Newtonian fluid materials possess the unique characteristics of being "flexible and easily filled under normal conditions, and instantly rigid upon impact," the buffer plate 170 simultaneously provides impact protection and cushioning. Of course, the buffer plate 170 may also include other structures, such as a wrapping structure that encloses the non-Newtonian fluid material layer. The specific structure of the buffer plate 170 can be flexibly configured according to actual conditions, and this embodiment does not limit this.

[0066] It should be noted that, as Figure 7 As shown, the buffer plate 170 can be installed on the side of the housing 100 facing the battery pack 200, that is, on the inner wall of the housing 100; or the buffer plate 170 can be installed on the side of the housing 100 away from the battery pack 200, that is, on the outer wall of the housing 100; or the buffer plate 170 can be installed on both the side of the housing 100 facing the battery pack 200 and the side of the housing 100 away from the battery pack 200, that is, simultaneously on the inner wall and the outer wall of the housing 100.

[0067] Additionally, a buffer plate 170 can be provided on the inner or outer side of the side plate 150 of the housing 100, or on the inner or outer side of the bottom plate 140 of the housing 100, or simultaneously on the inner or outer sides of both the side plate 150 and the bottom plate 140 of the housing 100. This allows for flexible placement of the buffer plate 170 according to the stress conditions at different locations of the battery pack 200, thus providing targeted protection. Of course, the specific location of the buffer plate 170 can be flexibly set according to actual conditions, and this embodiment does not limit this.

[0068] Optionally, such as Figure 7 As shown, the buffer plate 170 is detachably connected to the housing 100.

[0069] In this embodiment, the buffer plate 170 is detachably connected to the housing 100. When the buffer plate 170 is damaged, a new buffer plate 170 can be replaced without replacing the entire unit, thus reducing costs. Furthermore, the buffer plate 170 can be flexibly configured according to the stress conditions at different locations of the battery cell assembly 200.

[0070] Specifically, the buffer plate 170 and the housing 100 can be detachably connected by Velcro, double-sided tape or AB glue.

[0071] It should be noted that the specific connection form between the buffer plate 170 and the box 100 can be flexibly set according to the actual situation, and this application embodiment does not limit it.

[0072] In addition, the buffer plate 170 not only provides an extra physical barrier, but also effectively absorbs and disperses the energy generated by the impact. The buffer plate 170 and the housing 100 can be flexibly disassembled and assembled. When the panels of the housing 100 reach the end of their service life or need to be replaced due to a minor collision, they can be easily disassembled.

[0073] This application also provides an electrical device, including the battery pack of any of the above embodiments.

[0074] In the embodiments of this application, since the electrical device includes the battery pack of any of the above embodiments, the battery pack housing 100 includes a bottom plate 140 and a side plate 150. At least one of the side plate 150 and the bottom plate 140 is provided with a filling cavity 120, which is filled with a non-Newtonian fluid material. When the non-Newtonian fluid material is not subjected to external pressure, the movement between its molecules is relatively open, and the molecules are weakly connected. The molecules inside the non-Newtonian fluid material can move relatively freely, exhibiting a liquid or semi-liquid state. When the non-Newtonian fluid material is subjected to external pressure and undergoes severe deformation, the originally loose molecules are concentrated due to the external force (shear thickening), and the connection force between the molecules also becomes strong. Based on the unique characteristics of non-Newtonian fluid materials—"flexible and easy to fill under normal conditions, and instantly rigid upon impact"—this application incorporates non-Newtonian fluid materials within the filling cavities 120 of the base plate 140 and side plates 150. This allows the housing 100, battery pack, and electrical equipment to simultaneously provide impact protection and cushioning. Compared to traditional rigid protective materials, this reduces the probability of stress concentration during collisions or compressions. Compared to traditional cushioning materials, this enhances support and reduces deformation during collisions or compressions, effectively preventing battery pack deformation.

[0075] Specifically, the electrical equipment can be an electric vehicle. When driving an electric vehicle, it is inevitable that there will be scratches or collisions between the vehicle itself and between vehicles, which will cause the battery pack to be impacted. The non-Newtonian fluid material of the battery pack housing can play a good protective role.

[0076] Under normal driving conditions, non-Newtonian fluid materials in electric vehicles can remain in a liquid state, without adversely affecting the layout and heat dissipation of the battery pack. When the chassis of an electric vehicle is subjected to an external impact due to uncontrollable factors, the non-Newtonian fluid material will quickly harden, forming a temporary protective layer to reduce the impact of external shocks on the battery pack.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack having a third orientation (Z), characterized in that, The device includes a housing (100) and a battery cell assembly (200). The housing (100) includes a bottom plate (140) and a side plate (150). The side plate (150) is arranged around the third direction (Z). The bottom plate (140) is located on one side of the side plate (150) along the third direction (Z). The bottom plate (140) and the side plate (150) are connected to form a receiving cavity (110). The battery cell assembly (200) is disposed in the receiving cavity (110). At least one of the side plate (150) and the bottom plate (140) is provided with a filling cavity (120). The filling cavity (120) is filled with a non-Newtonian fluid material.

2. The battery pack according to claim 1, characterized in that, The filling cavity (120) includes a first filling cavity (151), which is located on the side plate (150).

3. The battery pack according to claim 2, characterized in that, The side plate (150) includes a plurality of sub-plates (160), which are arranged around the plurality of cells (210) in a third direction (Z), and at least some of the sub-plates (160) are provided with the first filling cavity (151).

4. The battery pack according to claim 3, characterized in that, Two adjacent sub-plates (160) can be detachably connected, or multiple sub-plates (160) can be integrally formed.

5. The battery pack according to claim 2, characterized in that, The filling cavity (120) includes a second filling cavity (141), which is disposed on the base plate (140).

6. The battery pack according to claim 5, characterized in that, The first filling cavity (151) and the second filling cavity (141) are either connected to each other or independent of each other.

7. The battery pack according to claim 1, characterized in that, The base plate (140) and the side plate (150) are detachably connected, or The base plate (140) and the side plate (150) are integrally formed.

8. The battery pack according to any one of claims 1 to 7, characterized in that, It also includes a buffer plate (170), which includes at least a non-Newtonian fluid material layer. The buffer plate (170) is located on the side of the housing (100) facing the battery cell assembly (200), and / or the buffer plate (170) is located on the side of the housing (100) away from the battery cell assembly (200). The buffer plate (170) is connected to the housing (100).

9. The battery pack according to claim 8, characterized in that, The buffer plate (170) is detachably connected to the box body (100).

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

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