Battery pack and electric device

Abstract

The embodiment of the application provides a battery pack and an electric device, the battery pack comprises a shell, a battery cell assembly, at least one fan and a first potting resin, the shell comprises a first side wall and a second side wall, the first side wall is provided with a first air vent, and the second side wall is provided with a second air vent; the battery cell assembly is located in the shell, the battery cell assembly comprises a plurality of battery cells, and a heat dissipation air duct is arranged between at least part of adjacent battery cells; the battery cell comprises a battery cell shell and an electric connection part located outside the battery cell shell; the fan is electrically connected with the battery cell assembly, the fan is arranged on the first side wall and faces the first air vent, and the fan is configured to flow external air of the battery pack through the first air vent, the heat dissipation air duct and the second air vent; and the first potting resin wraps the electric connection part.

Description

Technical Field

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

[0002] Normally, battery packs rely on natural heat dissipation during use. However, with the increasing variety of applications for battery packs, natural heat dissipation is no longer sufficient to meet the actual heat dissipation requirements of battery packs in some high-power applications. Summary of the Invention

[0003] The purpose of this application is to provide a battery pack and an electrical device to improve the heat dissipation of the battery pack.

[0004] The first aspect of this application provides a battery pack, including a housing, a cell assembly, at least one fan, and a first potting resin. The housing includes a first sidewall and a second sidewall. The first sidewall has a first vent, and the second sidewall has a second vent. The cell assembly is located inside the housing and includes multiple cells. At least some adjacent cells are connected by a heat dissipation channel. Each cell includes a cell housing and an electrical connection portion located outside the cell housing. The fan is electrically connected to the cell assembly and is located on the first sidewall, facing the first vent. The fan is configured to direct external airflow from the battery pack through the first vent, the heat dissipation channel, and the second vent, thereby improving the heat dissipation of the cell assembly. The first potting resin encapsulates the electrical connection portion to protect it.

[0005] In one or more of the above optional embodiments, the first potting resin includes potting compound or foaming compound.

[0006] In one or more of the above optional embodiments, the battery pack includes a first component, the first component including a first recess facing the cell assembly; an electrical connection portion located within the first recess; and a first potting resin disposed within the first recess and bonding the electrical connection portion and the first recess.

[0007] In one or more of the above optional embodiments, the first component includes a first main body portion and a first side portion surrounding and connected to the first main body portion, the first main body portion and the first side portion forming a first recess.

[0008] In one or more of the above optional embodiments, the cell housing includes a first sealing portion, an electrical connection portion extending out of the cell housing from the first sealing portion, and each first sealing portion being at least partially located within a first recess; a first potting resin encapsulates at least a portion of each first sealing portion.

[0009] In one or more of the above optional embodiments, the first sidewall and the second sidewall are arranged opposite to each other along the first direction, and the projection of the first vent along the first direction and the projection of the sealing part along the first direction are separate, which helps to reduce the impact of airflow inside the battery pack on the sealing part and improve the service life of the battery cell.

[0010] In one or more of the above optional embodiments, the projection of the first vent along the first direction and the projection of the first component along the first direction are separate, which helps to reduce the impact of airflow inside the battery pack on the first component and improve the service life of the first component.

[0011] In one or more of the above optional embodiments, the projection of the fan along the first direction and the projection of the first component along the first direction are separate, which helps to reduce the impact of airflow on the first component when the fan starts.

[0012] In one or more of the above optional embodiments, the battery cell housing includes a main body portion connected to a first sealing portion, the battery cell includes an electrode assembly disposed within the main body portion, and an electrical connection portion is connected to the electrode assembly. A first potting resin encapsulates a portion of each main body portion.

[0013] In one or more of the above optional embodiments, the battery pack includes a first circuit board disposed in a first recess, an electrical connection portion connected to the first circuit board, and a first potting resin potting and encapsulating the first circuit board.

[0014] In one or more of the above optional embodiments, the battery cell assembly includes a buffer, and a plurality of battery cells are arranged along a second direction. The buffer is located between adjacent battery cells, and the adjacent battery cells form a heat dissipation channel. The first direction and the second direction are perpendicular to each other.

[0015] In one or more of the above alternative embodiments, the buffer is configured to provide expansion space for the battery cell.

[0016] In one or more of the above alternative embodiments, the cushioning element includes foam.

[0017] In one or more of the above optional embodiments, the housing includes a third sidewall and a fourth sidewall disposed opposite to each other along a second direction; the third sidewall and the fourth sidewall are closures.

[0018] In one or more of the above optional embodiments, the battery pack includes a second component and a second potting resin. Along a third direction, the cell assembly is located between the second component and the first component, and the third direction and the first direction are perpendicular to each other. The second component includes a second recess facing the cell assembly, and a portion of each cell is located in the second recess. The second potting resin is disposed in the second recess and wraps a portion of each cell.

[0019] In one or more of the above optional embodiments, the second potting resin includes potting compound or foaming compound.

[0020] In one or more of the above optional embodiments, the second component includes a second main body portion and a second side portion surrounding and connected to the second main body portion, the second main body portion and the second side portion forming a second recess.

[0021] In one or more of the above optional embodiments, the battery pack includes a second circuit board and a first wiring harness, the first wiring harness being connected to a fan and the second circuit board, the second circuit board being configured to power the fan and control the fan's start and stop; the battery cell assembly having a positive electrode portion and a negative electrode portion, the positive electrode portion and the negative electrode portion being electrically connected to the second circuit board, and the first wiring harness being electrically connected to the positive electrode portion and the negative electrode portion.

[0022] In one or more of the above optional embodiments, the first component includes a first main body portion and a first side portion surrounding and connected to the first main body portion, the first main body portion and the first side portion forming a first recess; the first main body portion includes an extension portion protruding outward from the first side portion, the extension portion including a limiting opening, and the first wire harness passing through the limiting opening.

[0023] In one or more of the above optional embodiments, the battery cell assembly includes a first protective member disposed between a plurality of battery cells and a first sidewall, the first protective member having a first opening communicating with each heat dissipation duct and a first vent; and / or, the battery cell assembly includes a second protective member disposed between a plurality of battery cells and a second sidewall, the second protective member having a second opening communicating with each heat dissipation duct and a second vent.

[0024] In one or more of the above optional embodiments, the battery cell includes a pouch cell, and the cell housing includes an aluminum-plastic film. The cell housing includes two second sealing portions, which are located on both sides of the main body along a first direction. Along the first direction, the projection of the first protective member and the projection of the second sealing portion near the first protective member overlap, which helps to reduce the impact of air entering through the first vent on the second sealing portion of the battery cell.

[0025] In one or more of the above optional embodiments, along the first direction, the projection of the second protective member and the projection of the second sealing part near the second protective member overlap, which helps to reduce the impact of the wind entering from the second vent on the second sealing part of the battery cell.

[0026] The first aspect of this application provides an electrical device including the battery pack described above.

[0027] The beneficial effects of this application are as follows: This application provides a battery pack and an electrical device. The battery pack includes a housing, a cell assembly, at least one fan, and a first potting resin. The housing includes a first sidewall and a second sidewall. The first sidewall has a first vent, and the second sidewall has a second vent. The cell assembly is located inside the housing and includes multiple cells. At least some adjacent cells are connected by a heat dissipation channel. Each cell includes a cell housing and an electrical connection portion located outside the cell housing. The fan is electrically connected to the cell assembly and is located on the first sidewall, facing the first vent. The fan is configured to direct external airflow from the battery pack through the first vent, the heat dissipation channel, and the second vent, thereby improving the heat dissipation of the cell assembly. The first potting resin encapsulates the electrical connection portion to protect it. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0029] Figure 1 This is a schematic diagram of the battery pack structure according to one embodiment of this application;

[0030] Figure 2 for Figure 1 The diagram shows an exploded view of the battery pack.

[0031] Figure 3 for Figure 1 The diagram shows the exploded structure of the battery cell assembly of the battery pack.

[0032] Figure 4 for Figure 1 The diagram shows the internal structure of the battery pack.

[0033] Figure 5A for Figure 1 The cross-sectional view of the battery pack shown;

[0034] Figure 5B for Figure 1 The cross-sectional view of the battery pack shown;

[0035] Figure 6 for Figure 1 A schematic diagram of the structure of the first component of the battery pack shown;

[0036] Figure 7 for Figure 1 The diagram shows the structure of the battery pack's top cover and the second circuit board.

[0037] Figure 8 for Figure 6 The diagram shown is a partially enlarged view.

[0038] Figure 9 for Figure 1 The diagram shows the casing structure of the battery pack.

[0039] The attached figures are labeled as follows:

[0040] First direction X, second direction Y, third direction Z;

[0041] Housing 10, first sidewall 11, first gap 11a, third gap 11b, first vent 111, third vent 112, second sidewall 12, second vent 121, third sidewall 13, fourth sidewall 14, bottom wall 15, fourth vent 151, support 16, battery cell assembly 20, battery cell 21, heat dissipation duct 201, battery cell housing 210, first sealing part 2101a, second sealing part 2101b, main body 2102, electrical connection part 211, buffer 22, first protective part 23, first opening 231, second protective part 24, second opening 241, air Fan 30, first potting resin 40, first component 50, first recess 501, first main body 51, extension 511, limiting opening 512, third opening 513, fourth opening 514, fifth opening 515, first side 52, second component 60, second recess 601, second main body 61, second side 62, second potting resin 70, first circuit board 81, second circuit board 82, connector 820, first wire harness 83, positive electrode 84, negative electrode 85, second wire harness 86, top cover 90, first filler 101, second filler 102, third filler 103. Detailed Implementation

[0042] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," 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 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 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. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0044] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Where there is no conflict, the various embodiments in this application can be combined with each other.

[0046] It should be noted that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative examples and should not constitute any limitation on this application.

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0048] This application provides a battery pack and an electrical device, the main purpose of which is to improve the heat dissipation of the battery pack.

[0049] This application provides a battery pack that can be used in agricultural drones as a power source for agricultural drones, but is not limited thereto.

[0050] Figure 1 This is a schematic diagram of the battery pack structure according to one embodiment of this application. Figure 2 for Figure 1 The diagram shown is an exploded view of the battery pack. Figure 3 for Figure 1 The diagram shown is an exploded view of the battery cell assembly of the battery pack. Figure 4 for Figure 1 The diagram shown illustrates the internal structure of the battery pack. Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the battery pack includes a housing 10, a cell assembly 20, at least one fan 30, and a first potting resin 40.

[0051] Please see Figure 2As shown, the housing 10 includes a first sidewall 11 and a second sidewall 12. The first sidewall 11 is provided with a first vent 111, and the second sidewall 12 is provided with a second vent 121. A battery cell assembly 20 is located within the housing 10. In some embodiments, the battery cell assembly 20 is located within the housing 10. The battery cell assembly 20 includes a plurality of battery cells 21, and heat dissipation channels 201 are provided between at least partially adjacent battery cells 21. Please refer to [link / reference]. Figure 3 and Figure 4 As shown, the battery cell 21 includes a battery cell housing 210 and an electrical connection portion 211 located outside the battery cell housing 210. A heat dissipation duct 201 is provided between each adjacent battery cell 21 to improve the heat dissipation effect of the battery cell assembly 20. In other embodiments, a heat dissipation duct 201 is provided between some adjacent battery cells 21, which helps to reduce the volume of the battery cell assembly 20 and increase the volumetric energy density of the battery pack.

[0052] Combination Figure 2 As shown, the first potting resin 40 encapsulates the electrical connection portion 211. The encapsulation with the first potting resin 40 provides protection for the electrical connection portion 211. The first potting resin 40 includes, but is not limited to, potting compound and foaming compound.

[0053] In some embodiments, Figure 5A for Figure 1 Please refer to the cross-sectional view of the battery pack shown below. Figure 5A As shown, Z' is the opposite direction to the third direction Z. The fan 30 and the cell assembly 20 are electrically connected. The fan 30 is disposed on the first side wall 11 and faces the first vent 111. The fan 30 is configured to direct the external air of the battery pack through the first vent 111, the heat dissipation duct 201, and the second vent 121.

[0054] The fan 30 blows air from the side toward the first vent 111. After starting, the fan 30 blows air into the battery pack. Cold air from outside the battery pack enters the heat dissipation duct 201 through the first vent 111 and is blown out through the second vent 121, thus dissipating heat from the battery cell assembly 20. This helps improve the heat dissipation of the battery cell assembly 20.

[0055] In some embodiments, Figure 5B for Figure 1 Please refer to the cross-sectional view of the battery pack shown below. Figure 5B As shown, the suction side of the fan 30 faces the first vent 111. The fan 30 draws air into the battery pack, and under the negative pressure inside the battery pack, cold air from outside the battery pack enters the heat dissipation duct 201 through the second vent 121 and is blown out through the first vent 111, thus dissipating heat from the battery cell assembly 20. This helps improve the heat dissipation of the battery cell assembly 20.

[0056] In some embodiments, there may be at least two fans 30, which are disposed on the first sidewall 11, with their suction side or blowing side facing the first vent 111, thereby improving the heat dissipation of the battery cell assembly 20.

[0057] In some embodiments, the battery cell assembly 20 is not limited to being directly electrically connected to the fan 30 for discharging. Alternatively, it may discharge the battery by "transferring" electrical energy through other components.

[0058] Please see Figure 2 As shown, the first sidewall 11 and the second sidewall 12 are arranged opposite to each other along the first direction X, which is beneficial to the flow of air. In other embodiments, the first sidewall 11 and the second sidewall 12 can be two adjacent sidewalls.

[0059] Figure 6 for Figure 1 The schematic diagram of the first component of the battery pack shown is as follows: Figure 2 , Figure 3 and Figure 6 As shown, in some embodiments, the battery pack includes a first component 50, the first component 50 including a first recess 501 facing the cell assembly 20; an electrical connection portion 211 located within the first recess 501; and a first potting resin 40 disposed within the first recess 501 and bonding the electrical connection portion 211 and the first recess 501.

[0060] In some embodiments, the first sidewall 11 and the second sidewall 12 are arranged opposite to each other along the first direction X, and the projection of the fan 30 along the first direction X and the projection of the first component 50 along the first direction X are separate, which helps to reduce the influence of airflow on the first component 50 when the fan 30 is started.

[0061] In some embodiments, the cell housing 210 includes a first sealing portion 2101a, and an electrical connection portion 211 extends from the first sealing portion 2101a out of the cell housing 210. Each first sealing portion 2101a is at least partially located within a first recess 501. A first potting resin 40 encapsulates at least a portion of each first sealing portion 2101a. This protection of the first sealing portion 2101a by the first potting resin 40 helps to improve the service life of the cell 21.

[0062] In some embodiments, the cell housing 210 includes a main body portion 2102 connected to a first sealing portion 2101a. The cell 21 includes an electrode assembly disposed within the main body portion 2102, and an electrical connection portion 211 is connected to the electrode assembly. A first potting resin 40 encapsulates a portion of each main body portion 2102. This improves the positional stability of the cell 21. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator located between the positive and negative electrode.

[0063] In some embodiments, the projection of the first vent 111 along the first direction X and the projection of the first sealing part 2101a along the first direction X are separate, which helps to reduce the impact of airflow inside the battery pack on the first sealing part 2101a and improve the service life of the cell 21.

[0064] In some embodiments, the projection of the first vent 111 along the first direction X and the projection of the first component 50 along the first direction X are separate, which helps to reduce the impact of airflow inside the battery pack on the first component 50 and improve the service life of the first component 50.

[0065] In some embodiments, the battery pack includes a first circuit board 81 disposed within a first recess 501, an electrical connection portion 211 connected to the first circuit board 81, and a first potting resin 40 potting and encapsulating the first circuit board 81 to protect the first circuit board 81.

[0066] Combination Figure 3 and Figure 4 As shown, in some embodiments, the battery cell assembly 20 includes a buffer 22, and a plurality of battery cells 21 are arranged along the second direction Y. The buffer 22 is located between adjacent battery cells 21, and the adjacent battery cells 21 form a heat dissipation channel 201. The first direction X and the second direction Y are perpendicular to each other.

[0067] In some embodiments, the buffer 22 is configured to provide expansion space for the battery cell 21. Optionally, the buffer 22 includes foam.

[0068] In some embodiments, the battery pack includes a second component 60 and a second potting resin 70. Along a third direction Z, the cell assembly 20 is located between the second component 60 and the first component 50, and the third direction Z and the first direction X are perpendicular to each other. The second potting resin 70 includes, but is not limited to, potting compound and foaming compound.

[0069] In some embodiments, the second member 60 includes a second recess 601 facing the cell assembly 20, with a portion of each cell located in the second recess 601; a second potting resin 70 is disposed within the second recess 601 and encapsulates a portion of each cell 21. This secures the cells 21 in the cell assembly 20, improving the overall stability of the cell assembly 20.

[0070] In some embodiments, the second member 60 includes a second body portion 61 and a second side portion 62 surrounding and connected to the second body portion 61, the second body portion 61 and the second side portion 62 forming a second recess 601. Optionally, the second side portion 62 surrounds and is connected to the edge of the second body portion 61.

[0071] Figure 7 for Figure 1 The diagram shows the structure of the battery pack's top cover and the second circuit board, combined with... Figure 2 and Figure 7 As shown, in some embodiments, the battery pack includes a second circuit board 82 and a first wiring harness 83. The second circuit board 82 has multiple electronic components. The first wiring harness 83 connects a fan 30 and the second circuit board 82, and the second circuit board 82 is configured to power the fan 30 and control its start and stop. The cell assembly 20 includes a positive electrode portion 84 and a negative electrode portion 85, which are connected to the second circuit board 82. The first wiring harness 83 is electrically connected to the positive electrode portion 84 and the negative electrode portion 85.

[0072] The second circuit board 82 is configured to, when the battery pack is in a discharging or quiescent state, obtain electrical energy from the cell assembly 20, discharge it to the fan 30, and control the fan 30 to operate, so as to dissipate heat from the battery pack in the discharging or quiescent state, where the quiescent state means that the battery pack is neither charging nor discharging. When the battery pack is in a charging state, the second circuit board 82 obtains electrical energy from an external power source to provide power to the fan 30 and controls the fan 30 to operate, so as to dissipate heat from the battery pack in the charging state.

[0073] In some embodiments, the first circuit board 81, the first component 50, and the second circuit board 82 are arranged sequentially along the third direction Z. The positive electrode portion 84 is electrically connected to the cell assembly 20 and serves as the positive electrode of the cell assembly 20, and the negative electrode portion 85 is electrically connected to the cell assembly 20 and serves as the negative electrode of the cell assembly 20.

[0074] In some embodiments, the second circuit board 82 is fixed to the top cover 90. The battery pack includes a connector 820 connected to the second circuit board 82, the connector 820 being configured to connect to an electrical device.

[0075] Figure 8 for Figure 6 The enlarged schematic diagram shown is as follows ( Figure 6 (Enlarged view of A in the image) Figure 6 and Figure 8 As shown, in some embodiments, the first component 50 includes a first main body portion 51 and a first side portion 52 surrounding and connected to the first main body portion 51, the first main body portion 51 and the first side portion 52 forming a first recess 501. The first main body portion 51 includes an extension 511 protruding from the first side portion 52, the extension 511 including a limiting opening 512 through which the first wire harness 83 passes. This facilitates limiting the movement of the first wire harness 83.

[0076] Combination Figure 2 and Figure 6 As shown, the battery pack includes a second wiring harness 86, which connects to a first circuit board 81 and a second circuit board 82, and transmits signals.

[0077] In some embodiments, the first main body 51 is provided with a third opening 513, a fourth opening 514 and a fifth opening 515, the second wire harness 86 passes through the third opening 513 and is connected to the second circuit board 82, the positive electrode 84 passes through the fourth opening 514 and is connected to the second circuit board 82, and the negative electrode 85 passes through the fifth opening 515 and is connected to the second circuit board 82.

[0078] In some embodiments, the battery pack includes a first filler 101 that fills the gap between the third opening 513 and the second wiring harness 86. Optionally, the first filler 101 includes adhesive.

[0079] In some embodiments, the battery pack includes a second filler 102 that fills the gap between the fourth opening 514 and the positive electrode portion 84. Optionally, the second filler 102 includes adhesive.

[0080] In some embodiments, the battery pack includes a third filler 103 that fills the gap between the fifth opening 515 and the negative electrode portion 85. Optionally, the third filler 103 includes adhesive.

[0081] In some embodiments, after the first filler 101, the second filler 102, and the third filler 103 have cured, the first component 50 and the battery cell assembly 20 are rotated 180° along the first direction X to form an inverted shape. Then, the first potting resin 40 is injected into the first recess 501. After the first potting resin 40 has cured, the first component 50 and the battery cell assembly 20 are rotated 180° along the first direction X to form an inverted shape. Figure 4 The upright position.

[0082] Figure 2 and Figure 3 As shown, in some embodiments, the battery cell assembly 20 includes a first protective member 23 disposed between a plurality of battery cells 21 and a first sidewall 11. The first protective member 23 has a first opening 231 communicating with each heat dissipation duct 201 and a first vent 111. Optionally, the first protective member 23 may be made of polycarbonate.

[0083] In some embodiments, the battery cell 21 includes a pouch cell, and the battery cell housing 210 includes an aluminum-plastic film. The battery cell housing 210 includes two second sealing portions 2101b, which are located on both sides of the main body portion 2102 along the first direction X.

[0084] In some embodiments, along the first direction X, the projection of the first protective member 23 and the projection of the second sealing portion 2101b near the first protective member 23 overlap, which helps to reduce the impact of the wind entering from the first vent 111 on the second sealing portion 2101b of the cell 21.

[0085] In some embodiments, the cell assembly 20 includes a second protective member 24 disposed between a plurality of cells 21 and a second sidewall 12. The second protective member 24 has a second opening 241 communicating with each heat dissipation duct 201 and the second vent 121. Optionally, the second protective member 24 is made of polycarbonate.

[0086] In some embodiments, along the first direction X, the projection of the second protective member 24 and the projection of the second sealing portion 2101b near the second protective member 24 overlap, which helps to reduce the impact of the wind entering through the second vent 121 on the second sealing portion 2101b of the cell 21.

[0087] Figure 9 for Figure 1 The schematic diagram of the battery pack casing structure shown is as follows: Figure 9 As shown, in some embodiments, the housing 10 includes a third sidewall 13 and a fourth sidewall 14 disposed opposite each other along the second direction Y; the third sidewall 13 and the fourth sidewall 14 are closures, and neither the third sidewall 13 nor the fourth sidewall 14 has a vent. The airflow entering the battery pack is blocked by the third sidewall 13 and the fourth sidewall 14, which helps to limit the airflow from flowing more through the heat dissipation duct 201 and improve the heat dissipation of the cell assembly 20.

[0088] In some embodiments, combined with Figure 2 As shown, the housing 10 includes a top cover 90, which is connected to a first side wall 11, a second side wall 12, a third side wall 13 and a fourth side wall 14 to facilitate confining the battery cell assembly 20 within the housing 10.

[0089] In some embodiments, the first sidewall 11 is provided with a third vent 112, which is a free vent. There can be multiple third vents 112, arranged in an array along the second direction Y and the third direction Z. This is beneficial for further improving the heat dissipation of the battery pack.

[0090] In some embodiments, there may be multiple second vents 121, and the multiple second vents 121 are arranged in an array along the second direction Y and the third direction Z.

[0091] In some embodiments, the housing 10 includes a bottom wall 15, which connects a first side wall 11, a second side wall 12, a third side wall 13, and a fourth side wall 14. The bottom wall 15 is provided with a fourth vent 151. A first gap 11a (connecting) is provided between the battery cell assembly 20 and the first side wall 11. Figure 5AAs shown in the diagram, a second gap (not shown) is provided between the second recess 601 and the bottom wall 15. The second gap connects to the first gap 11a. Some of the heat dissipated by the cell assembly 20 is dissipated through the first gap 11a, the second gap, and the fourth vent 151. This helps to further improve the heat dissipation performance of the bottom of the battery pack.

[0092] In some embodiments, the cell assembly 20 and the second sidewall 12 are provided with a third gap 11b (combined with...) Figure 5A As shown, the second gap connects to the third gap 11b. Some of the heat dissipated by the cell assembly 20 is dissipated through the third gap 11b, the second gap, and the fourth vent 151. This helps to further improve the heat dissipation performance at the bottom of the battery pack.

[0093] In some embodiments, the housing 10 includes a support portion 16 disposed on the bottom wall 15, the support portion 16 protruding from the bottom wall 15; a second member 60 is disposed on the support portion 16 and forms a second gap through the support portion 16 and the bottom wall 15.

[0094] This application provides an electrical device including a battery pack according to any of the above embodiments.

[0095] This application does not specifically limit the electrical device, which includes electrical devices known in the prior art. For example, electrical devices include, but are not limited to, computers, smartphones, backup power supplies, two-wheeled vehicles, drones, power tools, or energy storage devices.

[0096] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery pack, characterized in that, include: The housing includes a first sidewall and a second sidewall, wherein the first sidewall is provided with a first vent and the second sidewall is provided with a second vent; A battery cell assembly is located inside the housing. The battery cell assembly includes a plurality of battery cells, and heat dissipation channels are provided between at least some of the adjacent battery cells. Each battery cell includes a battery cell housing and an electrical connection portion located outside the battery cell housing. At least one fan is electrically connected to the battery cell assembly. The fan is disposed on a first sidewall and faces the first vent. The fan is configured to direct external airflow from the battery pack through the first vent, the heat dissipation duct, and the second vent. The first potting resin encapsulates the electrical connection portion.

2. The battery pack according to claim 1, characterized in that, The battery pack includes a first component, the first component including a first recess facing the cell assembly; The electrical connection portion is located within the first recess; the first potting resin is disposed in the first recess and adheres to the electrical connection portion and the first recess.

3. The battery pack according to claim 2, characterized in that, The battery cell housing includes a first sealing portion, and the electrical connection portion extends from the first sealing portion out of the battery cell housing, with each first sealing portion at least partially located within the first recess. The first potting resin encapsulates at least a portion of each of the first seal portions.

4. The battery pack according to claim 3, characterized in that, The first sidewall and the second sidewall are arranged opposite each other along a first direction, and the projection of the first vent along the first direction and the projection of the first sealing part along the first direction are separate.

5. The battery pack according to any one of claims 2 to 4, characterized in that, The battery pack includes a first circuit board disposed in the first recess, the electrical connection portion is connected to the first circuit board, and the first potting resin pots and encapsulates the first circuit board.

6. The battery pack according to any one of claims 1 to 5, characterized in that, The first sidewall and the second sidewall are disposed opposite to each other along a first direction. The battery cell assembly includes a buffer. The plurality of battery cells are arranged along a second direction. The buffer is located between adjacent battery cells and makes the adjacent battery cells form a heat dissipation channel. The first direction and the second direction are perpendicular to each other.

7. The battery pack according to any one of claims 1 to 6, characterized in that, The housing includes a third sidewall and a fourth sidewall disposed opposite to each other along a second direction; the third sidewall and the fourth sidewall are closures.

8. The battery pack according to any one of claims 2 to 5, characterized in that, The battery pack includes a second component along a third direction, and the cell assembly is located between the second component and the first component, wherein the third direction and the first direction are perpendicular to each other; The second component includes a second recess facing the cell assembly, with a portion of each cell located in the second recess; A second potting resin is disposed within the second recess and encapsulates a portion of each of the battery cells.

9. The battery pack according to any one of claims 1 to 8, characterized in that, The battery pack includes a second circuit board and a first wiring harness, the first wiring harness connecting the fan and the second circuit board, the second circuit board being configured to power the fan and control the fan's start and stop; The battery cell assembly includes a positive electrode portion and a negative electrode portion, which are connected to the second circuit board. The first wire harness is electrically connected to the positive electrode portion and the negative electrode portion.

10. The battery pack according to claim 9, characterized in that, The first component includes a first main body portion and a first side portion connected to the first main body portion, wherein the first main body portion and the first side portion form the first recess; The first main body includes an extension protruding outward from the outer side of the first side portion, the extension including a limiting opening through which the first wire harness passes.

11. The battery pack according to any one of claims 1 to 10, characterized in that, The battery cell assembly includes a first protective member, which is disposed between the plurality of battery cells and the first sidewall. The first protective member has a first opening that communicates with each heat dissipation duct and the first ventilation port. and / or The battery cell assembly includes a second protective member disposed between the plurality of battery cells and the second sidewall, and the second protective member has a second opening communicating with each heat dissipation duct and the second vent.

12. An electrical appliance, characterized in that, The battery pack includes any one of claims 1 to 11 above.

Images