Battery pack and electric device

Abstract

The application provides a battery pack and a power utilization device. The battery pack comprises a shell, a first cell assembly, a second cell assembly and at least one fan. The shell comprises a first side wall and a second side wall arranged oppositely, a third side wall and a fourth side wall. The first side wall is provided with a first ventilation opening, the second side wall is provided with a second ventilation opening, and the third side wall is provided with a third ventilation opening. First heat dissipation air ducts are arranged between adjacent first cells in the first cell assembly. Second heat dissipation air ducts are arranged between adjacent second cells in the second cell assembly. A first air duct is located between the first cell assembly and the second cell assembly. The first heat dissipation air ducts are connected with the first ventilation opening and the first air duct, and the second heat dissipation air ducts are connected with the second ventilation opening and the first air duct. The fan is configured to flow air outside the battery pack through the third ventilation opening, the first air duct, the first heat dissipation air duct, the first ventilation opening, the second heat dissipation air duct and the second ventilation opening.

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] A first aspect of this application provides a battery pack, characterized in that it comprises: a housing, including a first sidewall and a second sidewall disposed opposite to each other along a first direction, a third sidewall and a fourth sidewall disposed opposite to each other along a second direction, the first sidewall having a first vent, the second sidewall having a second vent, and the third sidewall having a third vent; a first battery cell assembly located within the housing, the first battery cell assembly including a plurality of first battery cells, with a first heat dissipation duct provided between at least some adjacent first battery cells; and a second battery cell assembly located within the housing, the first battery cell assembly and the second battery cell assembly being spaced apart along the first direction. The battery pack includes multiple second cells, with a second heat dissipation duct between at least some of the adjacent second cells; a first ventilation duct located between the first cell assembly and the second cell assembly, the first heat dissipation duct connecting a first vent and the first duct, and a second heat dissipation duct connecting a second vent and the first duct; at least one fan electrically connected to at least one of the first cell assembly and the second cell assembly, the fan being configured to direct external airflow through a third vent, the first duct, the first heat dissipation duct, the first vent, the second heat dissipation duct, and the second vent, thereby improving the heat dissipation uniformity of the first cell assembly and the second cell assembly.

[0005] In one or more of the above optional embodiments, the first battery cell assembly includes a first buffer, a plurality of first battery cells are arranged along a second direction, the first buffer is located between adjacent first battery cells, and the adjacent first battery cells form a first heat dissipation channel; the second battery cell assembly includes a second buffer, a plurality of second battery cells are arranged along a second direction, the second buffer is located between adjacent second battery cells, and the adjacent second battery cells form a second heat dissipation airflow channel.

[0006] In one or more of the above optional embodiments, the battery pack includes a first component, including a first recess facing a first cell assembly and a second cell assembly; the first cell includes a first cell housing and a first electrical connection portion located outside the first cell housing, and the second cell includes a second cell housing and a second electrical connection portion located outside the second cell housing; the first electrical connection portion and the second electrical connection portion are located within the first recess; a first potting resin is disposed within the first recess and encapsulates the first electrical connection portion and the second electrical connection portion. The encapsulation with the first potting resin provides protection for the first electrical connection portion and the second electrical connection portion.

[0007] In one or more of the above optional embodiments, the first potting resin includes potting compound or foaming compound.

[0008] 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.

[0009] In one or more of the above optional embodiments, the battery pack includes a first circuit board disposed within a first recess, a first electrical connection portion and a second electrical connection portion connected to the first circuit board, and a first potting resin potting and encapsulating the first circuit board, thereby protecting the first circuit board.

[0010] In one or more of the above optional embodiments, the first cell housing includes a first sealing portion, a first electrical connection portion extending from the first sealing portion out of the first cell housing, and each portion of the first sealing portion is located within a first recess; the second cell housing includes a second sealing portion, a second electrical connection portion extending from the second sealing portion out of the second cell housing, and a portion of each second sealing portion is located within a first recess; a first potting resin encapsulates the first sealing portion and the second sealing portion. This protects the first sealing portion and the second sealing portion from the first potting resin, which helps to improve the service life of the first cell and the second cell.

[0011] In one or more of the above optional embodiments, the projections of the first vent along the first direction and the first sealing portion along the first direction are separate, as are the projections of the second vent along the first direction and the second sealing portion along the first direction. This helps to reduce the impact of airflow inside the battery pack on the first and second sealing portions, thereby improving the service life of the first and second battery cells.

[0012] 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, and the projection of the second 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.

[0013] In one or more of the above optional embodiments, the battery pack includes a second component. Along a third direction, a first cell assembly is located between the second component and the first component, and a second cell assembly is located between the second component and the first component. The third direction, the first direction, and the second direction are perpendicular to each other. The second component includes a second recess facing the first cell assembly and the second cell assembly. A portion of each first cell and a portion of each second cell are located in the second recess. A second potting resin is disposed within the second recess and encapsulates a portion of each first cell and a portion of each second cell. This facilitates the fixing of the cells in the first and second cell assemblies, improving the overall stability of the first and second cell assemblies.

[0014] In one or more of the above optional embodiments, the second potting resin includes potting compound or foam.

[0015] 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.

[0016] In one or more of the above optional embodiments, the housing includes a bottom wall, which connects to a first side wall, a second side wall, a third side wall, and a fourth side wall; the bottom wall is provided with a fourth vent; a third gap is provided between the second recess and the bottom wall; a first gap is provided between the first cell assembly and the first side wall; the third gap connects the first gap and the fourth vent; a second gap is provided between the second cell assembly and the second side wall; the third gap connects the second gap and the fourth vent. Part of the heat dissipated by the second cell assembly is dissipated through the second gap, the third gap, and the fourth vent. This helps to further improve the heat dissipation performance of the bottom of the battery pack.

[0017] In one or more of the above optional embodiments, the housing includes a support portion disposed on the bottom wall, the support portion protruding from the bottom wall; a second member is disposed on the support portion, and a third gap is formed between the support portion and the bottom wall.

[0018] In one or more of the above optional embodiments, the fourth sidewall is a closed plate without ventilation openings. The airflow entering the battery pack from the first ventilation channel is blocked by the fourth sidewall, which helps to limit the airflow to flow more through the first and second heat dissipation channels, thereby improving the heat dissipation of the first and second battery cell assemblies.

[0019] 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 connects to a fan and the second circuit board. The second circuit board is configured to power the fan and control its start and stop. A first cell assembly and a second cell assembly have positive and negative terminals, which are electrically connected to the second circuit board. The first wiring harness is electrically connected to the positive and negative terminals. The second circuit board is advantageously configured to, when the battery pack is in a discharging or stationary state, acquire electrical energy from the first and second cell assemblies, discharge it to the fan, and control the fan's operation to facilitate heat dissipation from the battery pack in the discharging or stationary state, where the stationary state refers to the battery pack not being charged or discharged. When the battery pack is in a charging state, the second circuit board acquires electrical energy from an external power source to power the fan and controls its operation to facilitate heat dissipation from the battery pack in the charging state.

[0020] In one or more of the above optional embodiments, a groove is provided on the outer side of the first side portion, and the first wire harness is disposed through the groove and connected to the second circuit board, which helps to restrict the movement of the first wire harness.

[0021] In one or more of the above optional embodiments, the fan is disposed on the third side wall and faces the third vent; or, the battery pack includes two fans, one of which is disposed on the first side wall and faces the first vent, and the other of which is disposed on the second side wall and faces the second vent.

[0022] In one or more of the above optional embodiments, the projection of the fan along the second direction and the projection of the first component along the second direction are separate, which helps to reduce the impact of airflow on the first component when the fan starts.

[0023] A second aspect of this application provides an electrical device, characterized in that it includes the aforementioned battery pack.

[0024] The beneficial effects of this application are:

[0025] This application provides a battery pack and an electrical device. The battery pack includes a housing, a first cell assembly, a second cell assembly, and at least one fan. The housing includes a first sidewall and a second sidewall disposed opposite to each other along a first direction, and a third sidewall and a fourth sidewall disposed opposite to each other along a second direction. The first sidewall is provided with a first vent, the second sidewall is provided with a second vent, and the third sidewall is provided with a third vent. The first cell assembly includes a plurality of first cells, and a first heat dissipation channel is provided between at least some of the adjacent first cells. The second cell assembly includes a plurality of second cells, and a second heat dissipation channel is provided between at least some of the adjacent second cells. The first vent is located between the first cell assembly and the second cell assembly, and the first heat dissipation channel connects the first vent and the first vent. The second heat dissipation channel connects the second vent and the first vent. At least one fan is electrically connected to at least one of the first cell assembly and the second cell assembly. The fan is configured to allow external air from the battery pack to flow through the third vent, the first vent, the first heat dissipation channel, the first vent, the second heat dissipation channel, and the second vent, which is beneficial to improving the heat dissipation uniformity of the first cell assembly and the second cell assembly.

[0026] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the battery pack structure according to one embodiment of this application;

[0029] Figure 2A for Figure 1 The cross-sectional view of the battery pack shown;

[0030] Figure 2B for Figure 1 The cross-sectional view of the battery pack shown;

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

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

[0033] Figure 5 for Figure 1 The diagram shows the structure of the first / second cell of the battery pack.

[0034] Figure 6 for Figure 1 The diagram shows an exploded view of the battery pack.

[0035] Figure 7 for Figure 1 The diagram shows the structure of the first component of the battery pack. Figure 1 ;

[0036] Figure 8 for Figure 1 The diagram shows the structure of the first component of the battery pack (Figure 2).

[0037] Figure 9 for Figure 1 The schematic diagram of the battery pack casing structure is shown. Figure 1 ;

[0038] Figure 10 for Figure 1 The second schematic diagram shows the casing structure of the battery pack;

[0039] Figure 11 for Figure 1 The diagram shows a partial structural diagram of the battery pack.

[0040] Figure 12 for Figure 11 The diagram shown is a partial enlargement.

[0041] The attached figures are labeled as follows:

[0042] Housing 10, first filler 101, second filler 102, third filler 103, first sidewall 11, first vent 111, second sidewall 12, second vent 121, third sidewall 13, third vent 131, fourth sidewall 14, first ventilation channel 15, bottom wall 16, third gap 16a, fourth vent 161, support 17, first cell assembly 20, first gap 20a, first cell 21, first cell housing 210, first electrical connection 211, first sealing part 212, first buffer 22, first protective pad 23, first heat dissipation channel 201, second cell assembly 30, second gap 30a The components include: a second battery cell 31, a second battery cell housing 310, a second electrical connection portion 311, a second sealing portion 312, a second buffer member 32, a second heat dissipation duct 301, a fan 40, a first component 50, a first recess 501, a first main body portion 51, a first opening 511, a second opening 512, a third opening 513, a first side portion 52, a groove 53, a first potting resin 60, a top cover 70, a first circuit board 711, a second wiring harness 712, a positive electrode portion 713, a negative electrode portion 714, a second circuit board 72, a first wiring harness 73, a second component 80, a second recess 801, a second main body portion 81, a second side portion 82, and a second potting resin 90.

[0043] First direction X, second direction Y, third direction Z. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Figure 1 This is a schematic diagram of the battery pack structure according to one embodiment of this application. Figure 2A for Figure 1 The cross-sectional view of the battery pack shown is as follows: Figure 1 and Figure 2A As shown, the battery pack includes a housing 10, a first cell assembly 20, and a second cell assembly 30, with the first cell assembly 20 and the second cell assembly 30 located within the housing 10. The second cell assembly 30 and the first cell assembly 20 are spaced apart along a first direction X.

[0053] X is the first direction, Y is the second direction, Z is the third direction, and Z' is the opposite direction of the third direction Z.

[0054] The housing 10 includes a first sidewall 11 and a second sidewall 12 arranged opposite to each other along a first direction X, a third sidewall 13 and a fourth sidewall 14 arranged opposite to each other along a second direction Y. The first sidewall 11 is provided with a first vent 111, the second sidewall 12 is provided with a second vent 121, and the third sidewall 13 is provided with a third vent 131.

[0055] In some embodiments, the first cell assembly 20 includes a plurality of first cells 21, and a first heat dissipation duct 201 is provided between at least some of the adjacent first cells. Figure 2A A first heat dissipation duct 201 is provided between each pair of adjacent first cells 21 to improve the heat dissipation effect of the first cell 21 membrane assembly 30. In other embodiments, the first heat dissipation duct 201 is provided between some pairs of adjacent first cells 21, which helps to reduce the volume of the first cell membrane assembly 20 and increase the volumetric energy density of the battery pack.

[0056] In some embodiments, the second battery cell assembly 30 includes a plurality of second battery cells 31, and a second heat dissipation duct 301 is provided between at least partially adjacent second battery cells 31. See also Figure 2A A second heat dissipation duct 301 is provided between each pair of adjacent second cells 31 to improve the heat dissipation effect of the second cell assembly 30. In other embodiments, a second heat dissipation duct 301 is provided between some pairs of adjacent second cells 31, which helps to reduce the volume of the first cell film assembly 20 and increase the volumetric energy density of the battery pack.

[0057] In some embodiments, the battery pack includes a first ventilation duct 15 located between a first cell assembly 20 and a second cell assembly 30, a first heat dissipation duct 201 connecting a first vent 111 and the first duct 15, and a second heat dissipation duct 301 connecting a second vent 121 and the first duct 15.

[0058] In some embodiments, the battery pack includes at least one fan 40, which is electrically connected to at least one of the first cell assembly 20 and the second cell assembly 30. The fan 40 is configured to direct external airflow from the battery pack through a third vent 131, a first air duct 15, a first heat dissipation air duct 201, a first vent 111, a second heat dissipation air duct 301, and a second vent 121.

[0059] In some embodiments, the fan 40 is electrically connected to the first battery cell assembly 20 and the second battery cell assembly 30 so that the first battery cell assembly 20 and the second battery cell assembly 30 rotate when the fan 40 discharges.

[0060] In some embodiments, the fan 40 is electrically connected to the first battery cell assembly 20 or the second battery cell assembly 30 so that the first battery cell assembly 20 or the second battery cell assembly 30 rotates when the fan 40 discharges.

[0061] The first battery cell assembly 20 and the second battery cell assembly 30 are not limited to being directly electrically connected to the fan 40 for discharging. Alternatively, they can discharge the power by "transferring" the power through other components.

[0062] Please refer to Figure 1 and Figure 2A As shown, in some embodiments, the fan 40 is disposed on the third sidewall 13 and faces the third vent 131.

[0063] In some embodiments, along the third direction Z, there are two fans 40, and the number of third ventilation holes 131 matches the number of fans 40. The two fans 40 and the two third ventilation holes 131 are connected in a one-to-one correspondence. Using a larger number of fans 40 is beneficial to improving the heat dissipation performance of the battery pack.

[0064] In some embodiments, the projection of the fan 40 along the second direction Y and the projection of the first component 50 along the second direction Y are separate, which helps to reduce the impact of airflow on the first component 50 when the fan 40 is started.

[0065] In some embodiments, the fan 40 blows air towards the third vent 131 (e.g., Figure 2AAs shown, after the fan 40 is started, the fan 40 blows air into the battery pack. The fan 40 blows air into the first air duct 15 through the third vent 131, blowing cold air from outside the battery pack into the first air duct 15. The cold air in the first air duct 15 is blown out through the first heat dissipation air duct 201 and the first vent 111 to dissipate heat from the first cell assembly 20, and blown out through the second heat dissipation air duct 301 and the second vent 121 to dissipate heat from the second cell assembly 30. This helps to improve the heat dissipation uniformity of the first cell assembly 20 and the second cell assembly 30.

[0066] Figure 2B for Figure 1 The cross-sectional view of the battery pack shown is as follows: Figure 2B As shown, in some embodiments, the suction side of the fan 40 faces the third vent 131. After the fan 40 is started, the fan 40 draws air into the battery pack and through the third vent 131, it draws air into the first air duct 15, creating a negative pressure inside the battery pack casing 10. This causes cold air from outside the battery pack to enter the first heat dissipation air duct 201 and the first air duct 15 through the first vent 111 and be drawn out through the third vent 131 to dissipate heat from the first cell assembly 20. Alternatively, cold air from outside the battery pack enters the second heat dissipation air duct 301 and the first air duct 15 through the second vent 121 and is drawn out through the third vent 131 to dissipate heat from the second cell assembly 30, thereby improving the heat dissipation uniformity of the first cell assembly 20 and the second cell assembly 30.

[0067] In some embodiments, the fan 40 is not limited to being disposed on the third sidewall 13. In some embodiments (not shown), the battery pack includes two fans 40, one of which is disposed on the first sidewall 11 and faces the first vent 111, and the other fan 40 is disposed on the second sidewall 12 and faces the second vent 121.

[0068] In some embodiments, one fan 40 is disposed on the first sidewall 11, blowing air towards the first vent 111, and the other fan 40 is disposed on the second sidewall 12, blowing air towards the second vent 121. After startup, the fans 40 blow air into the battery pack. Cold air from outside the battery pack enters through the first vent 111 into the first heat dissipation duct 201 and the first air duct 15, and exits through the third vent 131, dissipating heat from the first cell assembly 20. Conversely, cold air enters through the second vent 121 into the second heat dissipation duct 301 and the first air duct 15, and exits through the third vent 131, dissipating heat from the second cell assembly 30. The two streams of cold air from the first vent 111 and the second vent 121 dissipate heat from the first cell assembly 20 and the second cell assembly 30, respectively, thereby improving the heat dissipation uniformity of the first cell assembly 20 and the second cell assembly 30.

[0069] In some embodiments, one fan 40 is disposed on the first sidewall 11, with its suction side facing the first vent 111, and the other fan 40 is disposed on the second sidewall 12, with its suction side facing the second vent 121. After the fan 40 is started, the fan 40 draws air into the battery pack. Cold air outside the battery pack is drawn into the first air duct 15 through the third vent 131. The cold air in the first air duct 15 is drawn out through the first heat dissipation air duct 201 and the first vent 111 to dissipate heat from the first cell assembly 20, and through the second heat dissipation air duct 301 and the second vent 121 to dissipate heat from the second cell assembly 30, which helps to improve the heat dissipation uniformity of the first cell assembly 20 and the second cell assembly 30.

[0070] In some embodiments, Figure 3 for Figure 1 The exploded structural diagram of the first cell assembly 20 of the battery pack shown is as follows: Figure 2A and Figure 3 As shown, the first battery cell assembly 20 includes a first buffer 22, and a plurality of first battery cells 21 are arranged along the second direction Y. The first buffer 22 is located between adjacent first battery cells 21, and the adjacent first battery cells 21 form a first heat dissipation channel 201.

[0071] In some embodiments, the first buffer 22 is configured to provide expansion space for the first cell 21. Optionally, the first buffer 22 includes foam.

[0072] In some embodiments, the first cell assembly 20 includes a first protective pad 23, and a plurality of first cells 21 are arranged along a second direction Y. Along the second direction Y, the first protective pad 23 is disposed on both sides of the plurality of first cells 21.

[0073] Figure 4 for Figure 1 The schematic diagram of the second cell assembly of the battery pack shown is as follows: Figure 4 As shown, in some embodiments, the second battery cell assembly 30 includes a second buffer 32, and a plurality of second batteries 31 are arranged along the second direction Y. The second buffer 32 is disposed between adjacent second batteries 31, and the adjacent second batteries 31 form a second heat dissipation channel 301.

[0074] In some embodiments, the second buffer 32 is configured to provide expansion space for the second cell 31. Optionally, the second buffer 32 includes foam.

[0075] In some embodiments, the second cell assembly 30 includes a second protective pad, and a plurality of second cells 31 are arranged along a second direction Y. Along the second direction Y, the second protective pad is disposed on both sides of the plurality of second cells 31.

[0076] In some embodiments, the first protective pad 23 includes foam, and the second protective pad includes foam.

[0077] Figure 5 for Figure 1 The diagram shown illustrates the structure of the first / second cell of the battery pack. Figure 6 for Figure 1 The diagram shown is an exploded view of the battery pack. Figure 7 for Figure 1 The diagram shows the structure of the first component of the battery pack. Figure 1 , Figure 8 for Figure 1 The diagram shows the structure of the first component of the battery pack.

[0078] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, X' is the opposite direction of the first direction X. In some embodiments, the battery pack includes a first component 50 and a first potting resin 60. The first component 50 includes a first recess 501 facing the first cell assembly 20 and the second cell assembly 30. The first cell 21 includes a first cell housing 210 and a first electrical connection portion 211 located outside the first cell housing 210. The second cell 31 includes a second cell housing 310 and a second electrical connection portion 311 located outside the second cell housing 311. The first electrical connection portion 211 and the second electrical connection portion 311 are located within the first recess 501. The first potting resin 60 is disposed within the first recess 501 and encapsulates the first electrical connection portion 211 and the second electrical connection portion 311. The potting and encapsulation by the first potting resin 60 provides protection for the first electrical connection portion 211 and the second electrical connection portion 311. The first potting resin 60 includes, but is not limited to, potting compound and foaming compound.

[0079] 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, wherein the first main body portion 51 and the first side portion 52 form a first recess 501.

[0080] In some embodiments, the battery pack includes a top cover 70 connected to a housing 10, thereby facilitating the containment of a first cell assembly 20 and a second cell assembly 30 within the housing 10.

[0081] In some embodiments, such as Figure 6 As shown, the battery pack includes a first circuit board 711, which is disposed within a first recess 501. A first electrical connection portion 211 and a second electrical connection portion 311 are connected to the first circuit board 711, and a first potting resin 60 pots and encapsulates the first circuit board 711, thereby protecting the first circuit board 711.

[0082] In some embodiments, the battery pack includes a second circuit board 72 and a first wiring harness 73. The second circuit board 72 is provided with a plurality of electronic devices. The first wiring harness 73 connects the fan 40 and the second circuit board 72, and the second circuit board 72 is configured to discharge the fan 40 and control the start and stop of the fan 40; the first cell assembly 20 and the second cell assembly 30 form a positive electrode portion 713 and a negative electrode portion 714, which are connected to the second circuit board 72, and the first wiring harness 73 is electrically connected to the positive electrode portion 713 and the negative electrode portion 714.

[0083] The second circuit board 72 is configured to, when the battery pack is in a discharging or quiescent state, obtain electrical energy from the first cell assembly 20 and the second cell assembly 30, discharge it to the fan 40, and control the fan 40 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 72 obtains electrical energy from an external power source to provide power to the fan 40 and controls the fan 40 to operate, so as to dissipate heat from the battery pack in the charging state.

[0084] In some embodiments, the first circuit board 711, the first component 50, and the second circuit board 72 are arranged sequentially along the third direction Z. The positive electrode portion 713 is electrically connected to the first battery cell assembly 20 and the second battery cell assembly 30, serving as the positive electrode of the first battery cell assembly 20 and the second battery cell assembly 30. The negative electrode portion 714 is electrically connected to the first battery cell assembly 20 and the second battery cell assembly 30, serving as the negative electrode of the first battery cell assembly 20 and the second battery cell assembly 30.

[0085] In some embodiments, a groove 53 is provided on the outer side of the first side portion 52, and a first wire harness 73 is disposed through the groove 53 and connected to the second circuit board 72, which helps to restrict the movement of the first wire harness 73.

[0086] Figure 7 for Figure 1 The diagram shows the structure of the first component of the battery pack. Figure 1 , Figure 8 for Figure 1 The second schematic diagram shows the structure of the first component of the battery pack, combined with... Figure 6 , Figure 7 and Figure 8 As shown, the battery pack includes a second wiring harness 712, which connects to a first circuit board 711 and a second circuit board 72, and transmits signals.

[0087] In some embodiments, the first main body 51 is provided with a first opening 511, a second opening 512 and a third opening 513, the second wire harness 712 passes through the first opening 511 and is connected to the second circuit board 72, the positive electrode 713 passes through the second opening 512 and is connected to the second circuit board 72, and the negative electrode 714 passes through the third opening 513 and is connected to the second circuit board 72.

[0088] In some embodiments, the battery pack includes a first filler 101 that fills the gap between the first opening 511 and the second wiring harness 712. Optionally, the first filler 101 includes adhesive.

[0089] In some embodiments, the battery pack includes a second filler 102 that fills the gap between the second opening 512 and the positive electrode portion 713. Optionally, the second filler 102 includes adhesive.

[0090] In some embodiments, the battery pack includes a third filler 103 that fills the gap between the third opening 513 and the negative electrode portion 714. Optionally, the third filler 103 includes adhesive.

[0091] In some embodiments, after the first filler 101, the second filler 102, and the third filler 103 have cured, the battery first component 50, the first cell assembly 20, and the second cell assembly 30 are rotated 180° along the first direction X to form an inverted configuration. Then, the first potting resin 60 is injected into the first recess 501. After the first potting resin 60 has cured, the first component 50, the first cell assembly 20, and the second cell assembly 30 are rotated 180° along the first direction X to form an inverted configuration. Figure 6 The upright position.

[0092] Please see Figure 6 As shown, in some embodiments, the battery pack includes a second component 80 and a second potting resin 90. Along the third direction Z, a first cell assembly 20 is located between the second component 80 and the first component 50, and a second cell assembly 30 is located between the second component 80 and the first component 50. The third direction Z, the first direction X, and the second direction Y are perpendicular to each other. The second potting resin 90 includes, but is not limited to, potting compound and foaming compound.

[0093] In some embodiments, the second component 80 includes a second recess 801 facing the first cell assembly 20 and the second cell assembly 30, with a portion of each first cell 21 located in the second recess 801 and a portion of each second cell 31 located in the second recess 801; a second potting resin 90 is disposed in the second recess 801 and wraps a portion of each first cell 21 and a portion of each second cell 31, so as to fix the cells in the first cell assembly 20 and the second cell assembly 30 and improve the overall stability of the first cell assembly 20 and the second cell assembly 30.

[0094] In some embodiments, the second member 80 includes a second body portion 81 and a second side portion 82 surrounding and connected to the second body portion 81, the second body portion 81 and the second side portion 82 forming a second recess 801.

[0095] In some embodiments, Figure 5 As shown, the first cell housing 210 includes a first sealing portion 212, and a first electrical connection portion 211 extends from the first sealing portion 212 out of the first cell housing 210. Each first sealing portion 212 is partially located within the first recess 501. The second cell housing 310 includes a second sealing portion 312, and a second electrical connection portion 311 extends from the second sealing portion 312 out of the second cell housing 310. Each second sealing portion 312 is partially located within the first recess 501. A first potting resin 60 encapsulates the first sealing portion 212 and the second sealing portion 312, thereby protecting the first sealing portion 212 and the second sealing portion 312 and improving their service life.

[0096] In some embodiments, the projection of the first vent 111 along the first direction X and the projection of the first sealing part 212 along the first direction X are separate, and the projection of the second vent 121 along the first direction X and the projection of the second sealing part 312 along the first direction X are separate. This helps to reduce the impact of airflow inside the battery pack on the first sealing part 212 and the second sealing part 312, and improve the service life of the first cell 21 and the second cell 31.

[0097] 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, and the projection of the second vent 121 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.

[0098] In some embodiments, Figure 9 for Figure 1 The schematic diagram of the battery pack housing 10 shown. Figure 1 , Figure 10 for Figure 1The second schematic diagram shows the structure of the battery pack housing 10. Figure 11 for Figure 1 The diagram shows a partial structural diagram of the battery pack. Figure 12 for Figure 11 The enlarged schematic diagram shown is as follows ( Figure 11 (Enlarged view of A in the middle).

[0099] like Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, the housing 10 includes a bottom wall 16, which connects to a first side wall 11, a second side wall 12, a third side wall 13, and a fourth side wall 14. The bottom wall 16 has a fourth vent 161. A third gap 16a is provided between the second recess 801 and the bottom wall 16. A first gap 20a is provided between the first cell assembly 20 and the first side wall 11, and the third gap 16a connects the first gap 20a and the fourth vent 161. Part of the heat dissipated by the first cell assembly 20 is dissipated through the first gap 20a, the third gap 16a, and the fourth vent 161. A second gap 30a is provided between the second cell assembly 30 and the second side wall 12, and the third gap 16a connects the second gap 30a and the fourth vent 161. Part of the heat dissipated by the second cell assembly 30 is dissipated through the second gap 30a, the third gap 16a, and the fourth vent 161, which helps to further improve the heat dissipation performance of the bottom of the battery pack.

[0100] In some embodiments, the housing 10 includes a support portion 17 disposed on the bottom wall 16, the support portion 17 protruding from the bottom wall 16; a second member 80 is disposed on the support portion 17 and forms a third gap 16a through the support portion 17 and the bottom wall 16.

[0101] In some embodiments, the fourth sidewall 14 is a closed plate without ventilation openings. The airflow entering the battery pack from the first ventilation duct 15 is blocked by the fourth sidewall 14, which helps to limit the airflow to flow more through the first heat dissipation duct 201 and the second heat dissipation duct 301, thereby improving the heat dissipation of the first cell assembly 20 and the second cell assembly 30.

[0102] In some embodiments, there may be multiple first vents 111, and the multiple first vents 111 are arranged in an array along the second direction Y and the third direction Z.

[0103] 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.

[0104] This application provides an electrical device including a battery pack according to any of the above embodiments.

[0105] 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.

[0106] 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 disposed opposite to each other along a first direction, and a third sidewall and a fourth sidewall disposed opposite to each other along a second direction. The first sidewall is provided with a first vent, the second sidewall is provided with a second vent, and the third sidewall is provided with a third vent. A first battery cell assembly is located inside the housing. The first battery cell assembly includes a plurality of first battery cells, and a first heat dissipation air duct is provided between at least some of the adjacent first battery cells. The second battery cell assembly is located inside the housing. The first battery cell assembly and the second battery cell assembly are spaced apart along the first direction. The second battery cell assembly includes a plurality of second battery cells, and a second heat dissipation air duct is provided between at least some of the adjacent second battery cells. A first ventilation duct is located between the first battery cell assembly and the second battery cell assembly. The first heat dissipation duct connects the first ventilation opening and the first duct. The second heat dissipation duct connects the second ventilation opening and the first duct. At least one fan is electrically connected to at least one of the first battery cell assembly and the second battery cell assembly, the fan being configured to direct external airflow from the battery pack through a third vent, the first air duct, the first heat dissipation air duct, the first vent, the second heat dissipation air duct, and the second vent.

2. The battery pack according to claim 1, characterized in that, The first cell assembly includes a first buffer, the plurality of first cells are arranged along the second direction, the first buffer is located between adjacent first cells, and the adjacent first cells form a first heat dissipation channel; The second cell assembly includes a second buffer, the plurality of second cells are arranged along the second direction, the second buffer is disposed between adjacent second cells, and the adjacent second cells form a second heat dissipation channel.

3. The battery pack according to claim 1 or 2, characterized in that, The battery pack includes a first component, the first component including a first recess facing the first cell assembly and the second cell assembly; The first battery cell includes a first battery cell housing and a first electrical connection portion located outside the first battery cell housing; the second battery cell includes a second battery cell housing and a second electrical connection portion located outside the second battery cell housing; the first electrical connection portion and the second electrical connection portion are located within a first recess. A first potting resin is disposed within the first recess and encapsulates the first electrical connection portion and the second electrical connection portion.

4. The battery pack according to claim 3, characterized in that, The battery pack includes a first circuit board disposed within the first recess, and the first electrical connection portion and the second electrical connection portion are connected to the first circuit board. The first potting resin pots and encapsulates the first circuit board.

5. The battery pack according to claim 3 or 4, characterized in that, The first cell housing includes a first sealing portion, the first electrical connection portion extends from the first sealing portion out of the first cell housing, and each portion of the first sealing portion is located within the first recess; The second cell housing includes a second sealing portion, and a second electrical connection portion extends from the second sealing portion out of the second cell housing, with a portion of each second sealing portion located within the first recess; The first potting resin encapsulates the first sealing portion and the second sealing portion.

6. The battery pack according to claim 5, characterized in that, The projection of the first vent along the first direction and the projection of the first sealing part along the first direction are separate, and the projection of the second vent along the first direction and the projection of the second sealing part along the first direction are separate.

7. The battery pack according to any one of claims 3 to 6, characterized in that, The battery pack includes a second component, and along a third direction, the first cell assembly is located between the second component and the first component, and the second cell assembly is located between the second component and the first component, and the third direction, the first direction, and the second direction are perpendicular to each other; The second component includes a second recess facing the first cell assembly and the second cell assembly, wherein a portion of each of the first cells is located in the second recess and a portion of each of the second cells is located in the second recess; A second potting resin is disposed within the second recess and encapsulates a portion of each of the first and second cells.

8. The battery pack according to claim 7, characterized in that, The housing includes a bottom wall, which connects the first side wall, the second side wall, the third side wall, and the fourth side wall; the bottom wall is provided with a fourth ventilation opening; A third gap is provided between the second recess and the bottom wall, a first gap is provided between the first cell assembly and the first side wall, the third gap connects the first gap and the fourth vent, a second gap is provided between the second cell assembly and the second side wall, and the third gap connects the second gap and the fourth vent.

9. The battery pack according to claim 8, characterized in that, The housing includes a support portion disposed on the bottom wall, the support portion protruding from the bottom wall; The second component is disposed on the support portion and forms the third gap through the support portion and the bottom wall.

10. The battery pack according to any one of claims 1 to 9, 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 first battery cell assembly and the second battery cell assembly have a positive electrode portion and a negative electrode portion, the positive electrode portion and the negative electrode portion are electrically connected to the second circuit board, and the first wire harness is electrically connected to the positive electrode portion and the negative electrode portion.

11. The battery pack according to any one of claims 1 to 10, characterized in that, The fan is mounted on the third side wall and faces the third ventilation opening; or The battery pack includes two fans, one of which is located on the first side wall and faces the first vent, and the other is located on the second side wall and faces the second vent.

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

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