Battery pack and power consuming device

Abstract

The application discloses a battery pack and a power utilization device. The battery pack comprises a first shell, a second shell, a battery cell module and a connecting component. The first shell comprises a first top wall, the second shell is accommodated in the first shell and connected to the first shell, and the second shell and the first top wall are arranged at intervals along a first direction. The battery cell module is accommodated in the second shell. The connecting component is connected to the first top wall and the second shell, and the structural strength of the connecting component is greater than that of the second shell.

Description

Technical Field

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

[0002] Rechargeable battery cells are those that can be recharged after being discharged to reactivate the active materials and continue to be used. They are widely used in electrical devices such as drones, power tools, electric two-wheelers, and portable energy storage devices.

[0003] Battery packs typically consist of multiple cells to meet the voltage requirements of electrical devices. Improving the reliability of battery packs has been a key research focus in the development of battery technology. Summary of the Invention

[0004] This application provides a battery pack and an electrical device that can improve the reliability of the battery pack.

[0005] In a first aspect, this application provides a battery pack including a first housing, a second housing, a cell module, and a connecting component. The first housing includes a first top wall, and a second housing is housed within and connected to the first housing, with the second housing and the first top wall spaced apart along a first direction. The cell module is housed within the second housing. The connecting component is connected to the first top wall and the second housing, and the structural strength of the connecting component is greater than the structural strength of the second housing.

[0006] The spaced arrangement between the second housing and the first top wall provides storage space for other components. When the first housing is subjected to external impact, the connecting component can transfer the force to the second housing, effectively dispersing stress, reducing the risk of structural damage to the battery pack, and improving its reliability. The connecting component has greater structural strength than the second housing and can withstand greater forces, thus reducing the risk of breakage when the first housing is subjected to external impact.

[0007] In some embodiments, the second housing includes a second top wall, which is spaced apart from the first top wall along a first direction, and the second top wall has a first opening. The battery cell module includes a battery cell assembly and a first circuit board. The battery cell assembly includes a plurality of battery cells arranged along a second direction, the first direction being perpendicular to the second direction. Along the first direction, the first circuit board is located between the battery cell assembly and the second top wall, and the first circuit board is electrically connected to the battery cell assembly. The first circuit board includes a substrate, a first connection terminal, and a second connection terminal. The substrate has a first surface facing the second top wall, and the first and second connection terminals are disposed on the first surface. A receiving space is provided on the side of the first surface facing the second top wall, and the receiving space is opposite to the first opening along the first direction. The battery pack also includes a first busbar and a second busbar. The first busbar is connected to the first connection terminal in the receiving space and extends outside the second housing, and the second busbar is connected to the second connection terminal in the receiving space and extends outside the second housing.

[0008] Connecting the first busbar and the first connection terminal within the accommodating space keeps the connection point of the first busbar and the first connection terminal within the second housing, reducing the risk of short circuits. Similarly, connecting the second busbar and the second connection terminal within the accommodating space keeps the connection point of the second busbar and the second connection terminal within the second housing, further reducing the risk of short circuits.

[0009] In some embodiments, the battery pack includes a sealing member, at least a portion of which is located within a receiving space, and the sealing member is in contact with a first surface. The sealing member has a second opening, into which both a first connection terminal and a second connection terminal are received. The battery pack also includes a filler, at least a portion of which fills the second opening and forms a sealing interface at the first opening.

[0010] The filler can form a sealing interface at the first opening to prevent external moisture, impurities, etc., from entering the second housing, protecting the battery cell and the second circuit board. The filler filling the second opening can cover the connection between the first busbar and the first connection terminal, as well as the connection between the second busbar and the second connection terminal, thereby reducing the risk of external impurities (such as moisture) conducting between the first and second connection terminals, reducing the risk of short circuits, and improving safety performance. The sealing component can limit the filler during the filling process, thereby reducing the risk of filler overflowing to other areas of the first surface.

[0011] In some embodiments, the sealing component includes a plurality of second openings, with the first connection terminal and the second connection terminal respectively accommodated in different second openings. The sealing component can separate the first connection terminal and the second connection terminal, increasing the creepage distance between the first connection terminal and the second connection terminal and improving safety.

[0012] In some embodiments, the second housing includes a first component, at least a portion of which protrudes from the surface of the second top wall facing the first top wall, and the first component is connected to a connecting component. By providing the first component, the strength of the second housing can be enhanced, and the connection strength between the first component and the connecting component can be increased, thereby improving impact resistance.

[0013] In some embodiments, the second housing includes two first sidewalls disposed opposite each other along a third direction, the first direction, the second direction, and the third direction being perpendicular to each other. The first component includes a first portion and a second portion disposed along the first direction, the first portion protruding from the first sidewall along the third direction, and the second portion protruding from the first top wall along the first direction. A connecting component is disposed on one side of the second portion along the third direction and connected to the second portion, and the first portion and the connecting component are in contact and connected along the first direction.

[0014] When the impact force on the first top wall is transmitted to the connecting component, the first part can support the connecting component in the first direction and withstand the impact force, thereby reducing the stress on the first side wall and reducing the risk of structural damage to the second shell.

[0015] In some embodiments, the connecting member has a first recess at one end near the first portion. The second portion has a first protrusion at one end near the first portion, and the first protrusion contacts and is received in the first recess.

[0016] The first protrusion and the first recess engage in a convex-concave fit, serving a positioning function during the assembly of the connecting component and the second housing. The first protrusion also increases the contact area between the connecting component and the first component, aiding in the transmission and dispersion of stress.

[0017] In some embodiments, the first portion has a rib structure. Having a rib structure in the first portion can reduce its weight and increase the energy density of the battery pack while maintaining strength.

[0018] In some embodiments, the battery pack further includes a second circuit board located between the first and second top walls and connected to the second portion. The second portion provides mounting points for the second circuit board and stably supports it, reducing the risk of the second circuit board shaking when the battery pack is subjected to external impacts and improving the reliability of the battery pack.

[0019] In some embodiments, the battery pack further includes a bracket located between the second circuit board and the second top wall. The second housing includes a plurality of first components, and the bracket is connected to at least a portion of the second circuit board and the plurality of first components. The bracket can support the second circuit board from below, improving the stability of the second circuit board and reducing the risk of deformation of the second circuit board.

[0020] In some embodiments, a portion of the first component has a second protrusion that protrudes from the second portion and is connected to the second circuit board. The remaining first components are connected to the second circuit board via a bracket.

[0021] For the first component that is not connected to the bracket, a second protrusion can be provided to directly abut against the second circuit board, thereby providing uniform support to the second circuit board and reducing the tilt of the second circuit board.

[0022] In some embodiments, the second housing includes a first sub-housing and a second sub-housing disposed along a third direction. The first sub-housing is a monolithic component and includes a first sidewall and at least two first components. The second housing is a monolithic component and includes another first sidewall and at least two first components.

[0023] The first and second sub-shells are integrally molded parts, which have high structural strength and can provide more stable support for the connecting components, thereby reducing the risk of structural damage to the battery pack when subjected to external impacts.

[0024] In some embodiments, the second housing further includes a third protrusion that protrudes from the surface of the second top wall facing the first top wall. In a first direction, the second portion protrudes from the second top wall at a greater height than the third protrusion. The battery pack also includes a third circuit board located between the second circuit board and the second top wall and connected to the third protrusion.

[0025] The third protrusion provides a mounting point for the third circuit board and stably supports it, reducing the risk of the third circuit board shaking when the battery pack is subjected to external impacts and improving the reliability of the battery pack. The height of the third protrusion from the second top wall is less than the height of the second part protruding from the second top wall, which allows the second and third circuit boards to be at different heights, reducing the risk of interference between the second and third circuit boards.

[0026] In some embodiments, the battery pack further includes an external interface disposed on the outside of the second housing. A first bus connects a first connection terminal to the second circuit board, the third circuit board, and the external interface, and a second bus connects a second connection terminal to the second circuit board, the third circuit board, and the external interface.

[0027] The first and second buses connect the first, second, and third circuit boards and external interfaces, which can improve space utilization and reduce connection complexity.

[0028] In some embodiments, multiple connecting components are provided. Multiple connecting components can further improve the overall structural strength of the battery pack, reduce the risk of structural damage to the battery pack, and improve the reliability of the battery pack.

[0029] In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other. The first housing also includes a first bottom wall, two first side shells, and two control panels. The first bottom wall and the first top wall are disposed along the first direction. The first bottom wall is connected to the second housing. The two first side shells are disposed on both sides of the second housing along the third direction and connected to the second housing. The two control panels are disposed on both sides of the second housing along the second direction and connected to the second housing. The first side shells are connected to the first top wall and the first bottom wall.

[0030] In some embodiments, the second housing has protruding second components at both ends along the second direction, and the first side shell is connected to the second components. The protruding second components have high structural strength, and connecting the first side shell to the second components can improve the connection strength between the first side shell and the second housing, thereby improving the overall stability of the battery pack.

[0031] In some embodiments, the first side shell includes a shell body and a first connecting plate extending from the inner surface of the shell body. In a first direction, the first connecting plate is located between and connected to the connecting member and the first top wall.

[0032] The connecting component and the first top wall can limit the first connecting plate from both sides in the first direction, thereby improving the stability of the first side shell. The connecting component, the first connecting plate, and the first top wall are connected simultaneously, and the impact force on the first top wall and the first side shell can be dispersed by the connecting component, thereby improving the overall structural strength of the battery pack and reducing the risk of battery pack failure.

[0033] In some embodiments, the first connecting plate has a first hole, and a portion of the first top wall is received in the first hole. The first hole serves a positioning function when assembling the first top wall and the first side shell.

[0034] In some embodiments, the first housing further includes two second side shells disposed along a second direction. Each second side shell is connected to the first top wall and the two first side shells. Each second side shell has a third opening through which at least a portion of the control panel is exposed. The second side shells protect and limit the control panel, improving its stability. The control panel's interface is exposed through the third opening for user convenience.

[0035] In some embodiments, the first side shell further includes a second connecting plate extending from the inner surface of the shell body. In a first direction, the second connecting plate is located between and connects the second side shell and the first top wall. By providing the second connecting plate, a fixed connection between the first side shell, the second side shell, and the first top wall can be achieved, thereby improving the overall structural strength of the battery pack.

[0036] In some embodiments, the first bottom wall is provided with a second recess, and one end of the first side shell along a first direction is received in the second recess. During assembly, the second recess can position the first side shell. At the same time, the first bottom wall can be engaged with the first side shell by providing the second recess, thereby improving the overall structural strength of the battery pack.

[0037] Secondly, this application provides an electrical device that includes the battery pack provided in any embodiment of the first aspect. Attached Figure Description

[0038] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0039] Figure 1 This is a schematic diagram of the battery pack structure provided in some embodiments of this application;

[0040] Figure 2 for Figure 1 The diagram shows an exploded view of the battery pack.

[0041] Figure 3 This is a schematic diagram of a partial structure of a battery pack provided in some embodiments of this application;

[0042] Figure 4 for Figure 3 A three-dimensional cross-sectional view of the battery pack shown;

[0043] Figure 5 for Figure 4 Enlarged view of the area within the circle;

[0044] Figure 6 for Figure 3 Another schematic diagram of the battery pack shown, in which filler and wiring harness are omitted;

[0045] Figure 7 for Figure 6 The diagram shows an exploded view of the battery pack.

[0046] Figure 8 for Figure 7 The diagram shows the structure of the connecting component.

[0047] Figure 9 for Figure 7 The diagram shows the structure of the first sub-shell.

[0048] Figure 10 for Figure 7 The diagram shows the structure of the second subshell.

[0049] Figure 11 for Figure 7 The diagram shows the structure of the sealing component.

[0050] Figure 12 This is a schematic diagram of a partial structure of a battery pack provided in some embodiments of this application;

[0051] Figure 13 for Figure 12 Enlarged view of the area within the circle;

[0052] Figure 14 This is a schematic diagram of a partial structure of a battery pack provided in some embodiments of this application;

[0053] Figure 15 for Figure 14 Enlarged view of the area within the circle;

[0054] Figure 16 A cross-sectional schematic diagram of a battery pack provided in some embodiments of this application;

[0055] Figure 17 Another cross-sectional schematic diagram of a battery pack provided in some embodiments of this application;

[0056] Figure 18 This is a further cross-sectional schematic diagram of a battery pack provided in some embodiments of this application;

[0057] Figure 19 This is a perspective cross-sectional view of a battery pack provided in some embodiments of this application.

[0058] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0059]

[0060] Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The following embodiments are examples used to more clearly illustrate the technical solutions of this application, and should not be used to limit the scope of protection of this application. Those skilled in the art will understand that, without conflict, the following embodiments and features in the embodiments can be combined with each other.

[0062] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-10°, the two directions can be considered parallel.

[0064] The battery pack of this application is described below with reference to the accompanying drawings.

[0065] Reference Figures 1 to 11 The battery pack in this embodiment includes a first housing 1, a second housing 2, a cell module 3, and a connecting component 4. The first housing 1 includes a first top wall 11. The second housing 2 is housed within the first housing 1 and connected to the first housing 1. The second housing 2 and the first top wall 11 are spaced apart along a first direction Z. The cell module 3 is housed within the second housing 2. The connecting component 4 is connected to the first top wall 11 and the second housing 2, and the structural strength of the connecting component 4 is greater than the structural strength of the second housing 2.

[0066] In this embodiment, the second housing 2 and the first top wall 11 are spaced apart to provide accommodating space for other components. When the first housing 1 is subjected to external impact, the connecting component 4 can transfer the force to the second housing 2, thereby effectively dispersing stress, reducing the risk of structural damage to the battery pack, and improving the reliability of the battery pack. The connecting component 4 has greater structural strength than the second housing 2 and can withstand greater forces, thereby reducing the risk of the connecting component 4 breaking when the first housing 1 is subjected to external impact.

[0067] In some embodiments, the connecting component 4 can be a metal or a non-metallic component. In some examples, the material of the connecting component 4 may include aluminum, iron, or other metals; alternatively, the connecting component 4 may be a cast aluminum component or other lightweight metal component. In other examples, the material of the connecting component 4 may also be a high-strength non-metallic polymer material, for example, the material of the connecting component 4 may include SMC (Sheet Molding Compound) composite material.

[0068] In some embodiments, the second housing 2 may be made of plastic. For example, the material of the second housing 2 includes at least one of polycarbonate (PC) and ABS (Acrylonitrile Butadiene Styrene).

[0069] In some embodiments, the second housing 2 includes a second top wall 21, which is spaced apart from the first top wall 11 along a first direction Z, and the second top wall 21 is provided with a first opening 211.

[0070] The first opening 211 enables the connection between the components inside the second housing 2 and the components outside the second housing 2.

[0071] In some embodiments, the first direction Z, the second direction X, and the third direction Y are perpendicular to each other.

[0072] In some embodiments, the battery module 3 includes a battery assembly 30 and a first circuit board 32. The battery assembly 30 includes a plurality of battery cells 31 arranged along a second direction X, and the first direction Z is perpendicular to the second direction X.

[0073] In some embodiments, the multiple cells 31 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that the multiple cells are connected in both series and parallel.

[0074] The battery cell 31 can be a lithium-ion battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, or other types of battery cells. This application embodiment does not limit this.

[0075] Cell 31 can be either a hard-shell cell or a soft-pack cell.

[0076] The battery cell 31 can be a square battery cell, a cylindrical battery cell, or other irregularly shaped battery cell.

[0077] In some embodiments, along the first direction Z, the first circuit board 32 is located between the cell assembly 30 and the second top wall 21, and the first circuit board 32 is electrically connected to the cell assembly 30.

[0078] In some embodiments, the first circuit board 32 includes a printed circuit board (PCB). Optionally, the first circuit board 32 includes a flexible printed circuit (FPC).

[0079] In some embodiments, the first circuit board 32 includes a BMS (Battery Management System) component.

[0080] In some embodiments, the first circuit board 32 includes a substrate 321, a first connection terminal 322 and a second connection terminal 323. The substrate 321 has a first surface 3211 facing the second top wall 21, and the first connection terminal 322 and the second connection terminal 323 are disposed on the first surface 3211.

[0081] For example, one of the first connection terminal 322 and the second connection terminal 323 is electrically connected to the total positive terminal of the cell assembly 30, and the other is electrically connected to the total negative terminal of the cell assembly 30.

[0082] In some embodiments, the first surface 3211 has an accommodating space S on the side facing the second top wall 21, and the accommodating space S is opposite to the first opening 211 along the first direction Z.

[0083] For example, in the first direction Z, the first surface 3211 and the second top wall 21 are spaced apart. The accommodating space S may be the space located between the first surface 3211 and the second top wall 21 and opposite to the first opening 211 in the first direction Z.

[0084] In some embodiments, the battery pack further includes a first busbar 5a and a second busbar 5b. The first busbar 5a is connected to a first connection terminal 322 in the accommodating space S and extends outside the second housing 2. The second busbar 5b is connected to a second connection terminal 323 in the accommodating space S and extends outside the second housing 2.

[0085] Connecting the first busbar 5a and the first connection terminal 322 within the accommodating space S keeps the connection point between the first busbar 5a and the first connection terminal 322 within the second housing 2, reducing the risk of short circuits. Connecting the second busbar 5b and the second connection terminal 323 within the accommodating space S also keeps the connection point between the second busbar 5b and the second connection terminal 323 within the second housing 2, further reducing the risk of short circuits.

[0086] The accommodating space S is opposite to the first opening 211 along the first direction Z, and the first busbar 5a and the second busbar 5b can be led out to the outside of the second housing 2 through the first opening 211.

[0087] In some embodiments, the first busbar 5a and the first connection terminal 322 are connected by fasteners; exemplaryly, the first busbar 5a and the first connection terminal 322 are connected by bolts; optionally, the bolts are located in the receiving space S.

[0088] In some embodiments, the second busbar 5b and the second connection terminal 323 are connected by fasteners; exemplaryly, the second busbar 5b and the second connection terminal 323 are connected by bolts; optionally, the bolts are located in the receiving space S.

[0089] In some embodiments, the battery pack includes a sealing member 6, at least a portion of which is located within the accommodating space S, and the sealing member 6 is in contact with a first surface 3211. The sealing member 6 has a second opening 61, into which a first connection terminal 322 and a second connection terminal 323 are both accommodated. The battery pack also includes a filler 7, at least a portion of which fills the second opening 61 and forms a sealing interface at the first opening 211.

[0090] The filler 7 can form a sealing interface at the first opening 211 to prevent external moisture, impurities, etc. from entering the second housing 2, protecting the battery cell 31 and the second circuit board 32. The filler 7 filled in the second opening 61 can cover the connection between the first busbar 5a and the first connecting terminal 322 and the connection between the second busbar 5b and the second connecting terminal 323, thereby reducing the risk that external impurities (such as moisture) will conduct the first connecting terminal 322 and the second connecting terminal 323, reducing the risk of short circuit and improving safety performance. The sealing component 6 can limit the filler 7 during the filling process, thereby reducing the risk that the filler 7 will overflow to other areas of the first surface 3211.

[0091] In some embodiments, the sealing member 6 is resilient and interference-fits the first opening 211 so that at least a portion of the sealing member is received within the first opening 211. Embodiments of this application can reduce the risk of the filler 7 entering the second housing 2 from between the first opening 211 and the sealing member 6.

[0092] In some embodiments, the filler 7 may have insulating properties. For example, insulating adhesive can be injected into the accommodating space S through the first opening 211, and the insulating adhesive cures to form the filler 7.

[0093] In some embodiments, during the battery pack assembly process, the sealing member 6 is first inserted into the receiving space S through the first opening 211 and abuts against the first surface 3211. Then, the first busbar 5a is inserted into the second opening 61 and connected to the first connecting terminal 322 by a locking bolt; the second busbar 5b is inserted into the second opening 61 and connected to the second connecting terminal 323 by a locking bolt. Next, insulating colloid is injected into the first opening 211 and the second opening 61. After the insulating colloid fills the second opening 61, it continues to fill the first opening 211, thereby forming a sealing interface at the first opening 211 that seals it. Finally, the insulating colloid cures to form the filler 7.

[0094] In some embodiments, the sealing member 6 includes a plurality of second openings 61, and the first connecting terminal 322 and the second connecting terminal 323 are respectively accommodated in different second openings 61. The filler 7 fills the plurality of openings 61.

[0095] The sealing component 6 can separate the first connecting terminal 322 and the second connecting terminal 323, thereby increasing the creepage distance between the first connecting terminal 322 and the second connecting terminal 323 and improving safety.

[0096] In some embodiments, the first circuit board 32 further includes a connector 324 disposed on the first surface 3211, the connector 324 being received in the second opening 61. The battery pack also includes a wiring harness 8, which is connected to the connector 324 in the accommodating space S and extends outside the second housing 2.

[0097] In some embodiments, there are three second openings 61. The first connecting terminal 322, the second connecting terminal 323, and the connector 324 are respectively disposed in the three second openings 61.

[0098] In an alternative embodiment, there is one second opening 61, and the first connecting terminal 322, the second connecting terminal 323, and the connector 324 are spaced apart in the same second opening 61.

[0099] In some embodiments, the second housing 2 includes a first component 22, at least a portion of which protrudes from the surface of the second top wall 21 facing the first top wall 11, and the first component 22 is connected to the connecting component 4.

[0100] By setting the first component 22, the strength of the second housing 2 can be enhanced, and the connection strength between the first component 22 and the connecting component 4 can be increased, thereby improving the impact resistance.

[0101] In some embodiments, the second housing 2 includes two first sidewalls 26 disposed opposite each other along a third direction Y. A second top wall 21 connects the two first sidewalls 26.

[0102] In some embodiments, the first component 22 includes a first portion 221 and a second portion 222 disposed along a first direction Z. The first portion 221 protrudes from the first sidewall 26 along a third direction Y, and the second portion 222 protrudes from the first top wall 11 along the first direction Z. A connecting component 4 is disposed on one side of the second portion 222 along the third direction Y and connected to the second portion 222. The first portion 221 and the connecting component 4 are in contact and connected along the first direction Z.

[0103] When the impact force on the first top wall 11 is transmitted to the connecting component 4, the first part 221 can support the connecting component 4 in the first direction Z and withstand the impact force, thereby reducing the force on the first side wall 26 and reducing the risk of structural damage to the second shell 2.

[0104] In some embodiments, the connecting component 4 is fixedly connected to the second part 222 by fasteners.

[0105] In some embodiments, the connecting member 4 has a first recess 41 at one end near the first portion 221. The second portion 222 has a first protrusion 222a at one end near the first portion 221, and the first protrusion 222a contacts and is connected to the first portion 221 and is accommodated in the first recess 41.

[0106] The first protrusion 222a and the first recess 41 engage in a convex-concave fit, serving a positioning function during the assembly of the connecting component 4 and the second housing 2. The first protrusion 222a also increases the contact area between the connecting component 4 and the first component 22, which helps to transfer and distribute stress.

[0107] In some embodiments, the first portion 221 has a rib structure. The first portion 221 with the rib structure can reduce the weight of the first portion 221 and increase the energy density of the battery pack while ensuring strength.

[0108] For example, the rib structure includes an outer frame and a plurality of reinforcing ribs disposed in the outer frame.

[0109] In some embodiments, refer to Figures 7 to 15 The battery pack also includes a second circuit board 91, which is located between the first top wall 11 and the second top wall 21 and connected to the second part 222.

[0110] The second part 222 can provide mounting points for the second circuit board 91 and stably support the second circuit board 91, reducing the risk of the second circuit board 91 shaking when the battery pack is subjected to external impacts, and improving the reliability of the battery pack.

[0111] In some embodiments, the second circuit board 91 includes a printed circuit board (PCB).

[0112] In some embodiments, the second circuit board 91 can be used to implement AC and DC conversion.

[0113] In some embodiments, the battery pack further includes a bracket 92 located between the second circuit board 91 and the second top wall 21. The second housing 2 includes a plurality of first components 22, and the bracket 92 is connected to at least a portion of the second circuit board 91 and the plurality of first components 22.

[0114] The bracket 92 can support the second circuit board 91 from below, improving the stability of the second circuit board 91 and reducing the risk of deformation of the second circuit board 91.

[0115] In some embodiments, the bracket 92 is connected to the second portion 222 of the first component 22. Optionally, the bracket 92 and the second portion 222 abut against each other along a first direction Z.

[0116] In some embodiments, the second part 222, the bracket 92, and the second circuit board 91 are stacked along the first direction Z and connected by fasteners.

[0117] In some embodiments, the bracket 92 is connected to at least two first components 22. The second housing 2 may provide at least two connection points for the bracket 92, thereby increasing the connection strength between the bracket 92 and the second housing 2 and improving the stability of the bracket 92 and the second circuit board 91.

[0118] In some embodiments, a portion of the first component 22 is provided with a second protrusion 223, which protrudes from the second portion 222. The second protrusion 223 is connected to the second circuit board 91. The remaining first components 22 are connected to the second circuit board 91 via a bracket 92.

[0119] For the first component 22 that is not connected to the bracket 92, a second protrusion 223 can be provided to directly abut against the second circuit board 91, thereby providing uniform support to the second circuit board 91 and reducing the tilt of the second circuit board 91.

[0120] In some embodiments, a nut is integrated within the second protrusion 223, and the second circuit board 91 is connected to the second protrusion 223 by fasteners.

[0121] In some embodiments, the second housing 2 includes four first components 22. A bracket 92 is connected to three of the first components 22, none of which have a second protrusion 223. One first component 22 has a second protrusion 223. The three first components 22 without the second protrusion 223 are connected to the bracket 92 and the second circuit board 91 by fasteners, and the one first component 22 with the second protrusion 223 is connected to the second circuit board 91 by fasteners.

[0122] In some embodiments, the bracket 92 is a sheet metal bracket.

[0123] In some embodiments, the second housing 2 includes a first sub-housing 24 and a second sub-housing 25 disposed along a third direction Y.

[0124] The first sub-shell 24 and the second sub-shell 25 are connected and joined together to form an internal space for accommodating the battery cell module 3. Exemplarily, the first sub-shell 24 is snapped onto the second sub-shell 25, and an adhesive is provided at the joint between the first sub-shell 24 and the second sub-shell 25, which can serve as an adhesive and sealant.

[0125] In some embodiments, the first sub-shell 24 can be formed as a single piece by injection molding. The first sub-shell 24 includes a first sidewall 26 and at least two first components 22. The first sub-shell 24 is a single-piece molded part, which has high structural strength and can provide more stable support for the connecting component 4, thereby reducing the risk of structural damage to the battery pack when subjected to external impact.

[0126] In some embodiments, the second sub-shell 25 can be formed as a single piece by injection molding. The second sub-shell 25 includes another first sidewall 26 and at least two first components 22. The second sub-shell 25 is a single-piece molded part, which has high structural strength and can provide more stable support for the connecting component 4, thereby reducing the risk of structural damage to the battery pack when subjected to external impact.

[0127] In some embodiments, the second housing 2 further includes a third protrusion 27 that protrudes from the surface of the second top wall 21 facing the first top wall 11. In the first direction Z, the second portion 222 protrudes from the second top wall 21 at a greater height than the third protrusion 27. The battery pack also includes a third circuit board 93, which is located between the second circuit board 91 and the second top wall 21 and connected to the third protrusion 27.

[0128] The third protrusion 27 provides a mounting point for the third circuit board 93 and stably supports it, reducing the risk of the third circuit board 93 shaking when the battery pack is subjected to external impacts and improving the reliability of the battery pack. The height of the third protrusion 27 protruding from the second top wall 21 is less than the height of the second part 222 protruding from the second top wall 21, which allows the second circuit board 91 and the third circuit board 93 to be at different heights, reducing the risk of interference between the second circuit board 91 and the third circuit board 93.

[0129] In some embodiments, there are multiple third protrusions 27. For example, there are 4 to 6 third protrusions 27.

[0130] In some embodiments, the third circuit board 93 includes a printed circuit board (PCB).

[0131] In some embodiments, the third circuit board 93 can be used to convert voltage. For example, the third circuit board 93 can regulate the voltage of an externally supplied power source with large voltage fluctuations.

[0132] In some embodiments, the battery pack further includes an external interface 94 disposed on the outside of the second housing 2. Exemplarily, multiple battery packs can be connected in series, in parallel, or in a mixed configuration via the external interface 94.

[0133] In some embodiments, the first bus 5a connects the first connection terminal 322 to the second circuit board 91, the third circuit board 93 and the external interface 94, and the second bus 5b connects the second connection terminal 323 to the second circuit board 91, the third circuit board 93 and the external interface 94.

[0134] The first busbar 5a and the second busbar 5b connect the first circuit board 32, the second circuit board 91, the third circuit board 93 and the external interface 94, which can improve space utilization and reduce connection complexity.

[0135] In some embodiments, the first connection terminal 322 is the positive terminal, and the first bus 5a connects the positive terminals of the first circuit board 32, the second circuit board 91, the third circuit board 93, and the external interface 94; the second connection terminal 323 is the negative terminal, and the second bus 5b connects the negative terminals of the first circuit board 32, the second circuit board 91, the third circuit board 93, and the external interface 94.

[0136] In some embodiments, both the first busbar 5a and the second busbar 5b are flexible copper busbars.

[0137] In some embodiments, the outer periphery of the first busbar 5a is covered with an insulating sleeve, and the outer periphery of the second busbar 5b is covered with an insulating sleeve.

[0138] In some embodiments, multiple connecting components 4 are provided. Multiple connecting components 4 can further improve the overall structural strength of the battery pack, reduce the risk of structural damage to the battery pack, and improve the reliability of the battery pack.

[0139] In some embodiments, the number of connecting parts 4 is the same as the number of first parts 22, and the connecting parts 4 and the first parts 22 are arranged in a one-to-one correspondence.

[0140] In some embodiments, there are four connecting parts 4. The four connecting parts 4 are located at the four corners of the second housing 2.

[0141] In some embodiments, refer to Figure 2 , Figures 16 to 19 The first housing 1 also includes a first bottom wall 12, two first side shells 13, and two control panels 14. The first bottom wall 12 and the first top wall 11 are arranged along a first direction Z. The first bottom wall 12 is connected to the second housing 2. The two first side shells 13 are located on both sides of the second housing 2 along a third direction Y and are connected to the second housing 2. The two control panels 14 are located on both sides of the second housing 2 along a second direction X and are connected to the second housing 2. The first side shells 13 are connected to the first top wall 11 and the first bottom wall 12.

[0142] In some embodiments, the second housing 2 is fixedly connected to the first bottom wall 12 by fasteners. Alternatively, the second housing 2 is fixedly connected to the first bottom wall 12 by bolts.

[0143] In some embodiments, the first side shell 13 is fixedly connected to the second shell 2 by fasteners.

[0144] In some embodiments, the control panel 14 is snapped into the second housing 2.

[0145] In some embodiments, the second housing 2 has protruding second components 23 at both ends along the second direction X, and the first side housing 13 is connected to the second components 23.

[0146] The protruding second component 23 has high structural strength. Connecting the first side shell 13 to the second component 23 can improve the connection strength between the first side shell 13 and the second shell 2, and improve the overall stability of the battery pack.

[0147] In some embodiments, the second housing 2 includes four second components 23. The four second components 23 are disposed at the four corners of the second housing 2. Optionally, the four second components 23 are respectively connected to four first components 22.

[0148] One first side shell 13 is bolted to two second parts 23, and another first side shell 13 is bolted to two other second parts 23.

[0149] In some embodiments, two second components 23 located at one end of the second housing 2 along the second direction X are snapped together to a control panel 14, and two second components 23 located at the other end of the second housing 2 along the second direction X are snapped together to another control panel 14.

[0150] In some embodiments, one control panel 14 is a DC control panel, and the other control panel 14 is an AC control panel.

[0151] In some embodiments, the first sub-housing 24 includes two first components 22 and two second components 23; the second sub-housing 25 includes two first components 22 and two second components 23.

[0152] In some embodiments, the first side shell 13 includes a shell body 131 and a first connecting plate 132 extending from the inner surface of the shell body 131. In the first direction Z, the first connecting plate 132 is located between the connecting member 4 and the first top wall 11 and is connected to the connecting member 4 and the first top wall 11.

[0153] The connecting component 4 and the first top wall 11 can limit the first connecting plate 132 from both sides in the first direction Z, thereby improving the stability of the first side shell 13. The connecting component 4, the first connecting plate 132 and the first top wall 11 are connected at the same time. The impact force on the first top wall 11 and the first side shell 13 can be dispersed by the connecting component 4, thereby improving the overall structural strength of the battery pack and reducing the risk of battery pack failure.

[0154] In some embodiments, the connecting component 4, the first connecting plate 132, and the first top wall 11 are connected by fasteners. Exemplarily, a bolt passes through the first top wall 11 and the first connecting plate 132 and is threaded into the connecting component 4.

[0155] In some embodiments, the first connecting plate 132 is provided with a first hole 133, and a portion of the first top wall 11 is accommodated in the first hole 133.

[0156] When assembling the first top wall 11 and the first side shell 13, the first hole 133 can serve a positioning function. In addition, when the battery pack is subjected to external impact, the portion of the first top wall 11 extending into the first hole 133 can mutually limit the first connecting plate 132, thereby reducing the deformation of the first top wall 11 and the first side shell 13.

[0157] In some embodiments, the first housing 1 further includes two second side housings 15 disposed along a second direction X. Each second side housing 15 is connected to the first top wall 11 and the two first side housings 13. The second side housing 15 is provided with a third opening 151 through which at least a portion of the control panel 14 is exposed.

[0158] The second side shell 15 can protect the control panel 14 and limit its movement, improving the stability of the control panel 14. The control interface of the control panel 14 can be exposed through the third opening 151 for user convenience.

[0159] In some embodiments, a portion of the control panel 14 is embedded in the third opening 151. The second side shell 15 may further hold the control panel 14 in place.

[0160] In some embodiments, the first side shell 13 further includes a second connecting plate 134 extending from the inner surface of the shell body 131. In the first direction Z, the second connecting plate 134 is located between and connects the second side shell 15 and the first top wall 11.

[0161] By setting the second connecting plate 134, the first side shell 13, the second side shell 15 and the first top wall 11 can be fixedly connected, thereby improving the overall structural strength of the battery pack.

[0162] In some embodiments, the first top wall 11, the second connecting plate 134, and the second side shell 15 are connected by bolts.

[0163] In some embodiments, the first side shell 13 includes two second connecting plates 134. The two second connecting plates 134 are respectively located on both sides of the first connecting plate 132.

[0164] In some embodiments, the first bottom wall 12 is provided with a second recess 121, and one end of the first side shell 13 along the first direction Z is accommodated in the second recess 121.

[0165] During assembly, the second recess 121 can position the first side shell 13. At the same time, the first bottom wall 12 can be engaged with the first side shell 13 by providing the second recess 121, thereby improving the overall structural strength of the battery pack.

[0166] This application also provides an electrical device that includes the battery pack provided in any of the foregoing embodiments. The battery pack can provide electrical energy for the operation of the electrical device. The electrical device in the embodiments of this application can be a portable energy storage device, such as a portable power bank.

[0167] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pack, characterized in that, include: The first housing includes a first top wall; The second housing is housed within and connected to the first housing, and the second housing and the first top wall are spaced apart along a first direction; A battery cell module is housed within a second housing. The battery cell module includes a battery cell assembly, which includes a plurality of said battery cells arranged along a second direction. A connecting component, which connects to the first top wall and the second housing; The structural strength of the connecting component is greater than that of the second housing. The second housing includes a second top wall, a first component, and two first side walls. The second top wall and the first top wall are spaced apart along the first direction, and the two first side walls are arranged opposite each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The first component includes a first part and a second part disposed along the first direction. The first part protrudes from the first sidewall along the third direction, and the second part protrudes from the second top wall along the first direction. The connecting member is disposed on one side of the second part along the third direction and connected to the second part. The first part and the connecting member are in contact and connected along the first direction.

2. The battery pack according to claim 1, characterized in that, The second top wall is provided with a first opening; The battery cell module includes a first circuit board; Along the first direction, the first circuit board is located between the cell assembly and the second top wall, and the first circuit board is electrically connected to the cell assembly; The first circuit board includes a substrate, a first connection terminal and a second connection terminal, the substrate having a first surface facing the second top wall, and the first connection terminal and the second connection terminal being disposed on the first surface; The first surface has an accommodating space on the side facing the second top wall, and the accommodating space is opposite to the first opening along the first direction; The battery pack further includes a first busbar and a second busbar, wherein the first busbar is connected to the first connection terminal in the accommodating space and extends to the outside of the second housing, and the second busbar is connected to the second connection terminal in the accommodating space and extends to the outside of the second housing.

3. The battery pack according to claim 2, characterized in that, The battery pack includes a sealing component, at least a portion of which is located in the accommodating space, and the sealing component is in contact with the first surface; The sealing component is provided with a second opening, and both the first connecting terminal and the second connecting terminal are accommodated in the second opening; The battery pack also includes a filler that at least partially fills the second opening and forms a sealing interface at the first opening.

4. The battery pack according to claim 3, characterized in that, The sealing component includes a plurality of second openings, and the first connecting terminal and the second connecting terminal are respectively accommodated in different second openings.

5. The battery pack according to claim 1, characterized in that, The connecting component has a first recess at one end near the first part; The second part has a first protrusion at one end near the first part, and the first protrusion is in contact with the first part and is accommodated in the first recess.

6. The battery pack according to any one of claims 1-5, characterized in that, The first part has a rib structure.

7. The battery pack according to claim 2, characterized in that, The battery pack also includes a second circuit board, which is located between the first top wall and the second top wall and connected to the second part.

8. The battery pack according to claim 7, characterized in that, The battery pack also includes a bracket located between the second circuit board and the second top wall; The second housing includes a plurality of the first components, and the bracket is connected to at least a portion of the second circuit board and the plurality of the first components.

9. The battery pack according to claim 8, characterized in that, A portion of the first component is provided with a second protrusion, which protrudes from the second portion; The second protrusion is connected to the second circuit board; The remaining first components are connected to the second circuit board via the bracket.

10. The battery pack according to claim 1, characterized in that, The second housing includes a first sub-housing and a second sub-housing disposed along the third direction; The first sub-shell is an integrally molded part, and the first sub-shell includes a first sidewall and at least two first components; The second sub-shell is a one-piece molded part, and the second sub-shell includes another first sidewall and at least two first components.

11. The battery pack according to claim 7, characterized in that, The second housing further includes a third protrusion that protrudes from the surface of the second top wall facing the first top wall; In the first direction, the height of the second portion protruding from the second top wall is greater than the height of the third protrusion protruding from the second top wall; The battery pack also includes a third circuit board, which is located between the second circuit board and the second top wall and connected to the third protrusion.

12. The battery pack according to claim 11, characterized in that, The battery pack also includes an external interface disposed on the outside of the second housing; The first bus connects the first connection terminal to the second circuit board, the third circuit board, and the external interface, and the second bus connects the second connection terminal to the second circuit board, the third circuit board, and the external interface.

13. The battery pack according to claim 1, characterized in that, The connecting components are configured in multiple ways.

14. The battery pack according to claim 1, characterized in that, The first housing further includes a first bottom wall, two first side shells, and two control panels. The first bottom wall and the first top wall are arranged along the first direction. The first bottom wall is connected to the second housing. The two first side shells are arranged on both sides of the second housing along the third direction and connected to the second housing. The two control panels are arranged on both sides of the second housing along the second direction and connected to the second housing. The first side shell is connected to the first top wall and the first bottom wall.

15. The battery pack according to claim 14, characterized in that, The second housing has protruding second components at both ends along the second direction, and the first side shell is connected to the second components.

16. The battery pack according to claim 15, characterized in that, The first side shell includes a shell body and a first connecting plate extending from the inner surface of the shell body; In the first direction, the first connecting plate is located between the connecting component and the first top wall and is connected to the connecting component and the first top wall.

17. The battery pack according to claim 16, characterized in that, The first connecting plate has a first hole, and a portion of the first top wall is accommodated in the first hole.

18. The battery pack according to claim 16, characterized in that, The first housing further includes two second side shells, which are arranged along the second direction; Each of the second side shells is connected to the first top wall and the two first side shells; The second side shell has a third opening through which at least a portion of the control panel is exposed.

19. The battery pack according to claim 18, characterized in that, The first side shell also includes a second connecting plate extending from the inner surface of the shell body; In the first direction, the second connecting plate is located between the second side shell and the first top wall and is connected to the second side shell and the first top wall.

20. The battery pack according to claim 14, characterized in that, The first bottom wall is provided with a second recess, and one end of the first side shell along the first direction is accommodated in the second recess.

21. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1-20.

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