Battery pack and electric device

Abstract

A battery pack, comprising a first housing and a cell module accommodated in the first housing. The first housing comprises a first opening. The battery cell module comprises a plurality of battery cell assemblies arranged in a first direction. A first channel is formed between two adjacent battery cell assemblies, and the first channel is in communication with the outside of the battery pack by means of the first opening. Each battery cell assembly comprises at least one battery cell. Each battery cell comprises a second housing, a first electrode terminal and a second electrode terminal, wherein the second housing comprises a first end surface and a second end surface, and in a second direction perpendicular to the first direction, the first end surface and the second end surface are arranged opposite each other. The first electrode terminal protrudes from the first end surface, and the second electrode terminal protrudes from the second end surface. The first channel extends in a third direction, and the third direction is perpendicular to the first direction and the second direction.

Description

Battery packs and electrical equipment Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and electrical device. Background Technology

[0002] Battery packs are currently widely used in drones, electric vehicles, energy storage devices, and other fields. During use, battery packs can experience overheating. When the battery pack finishes discharging and needs to be recharged, the temperature of the cells needs to be reduced to a safe range. Therefore, it is necessary to improve the heat dissipation efficiency of battery packs. Summary of the Invention

[0003] One objective of this application is to provide a battery pack and electrical device with better heat dissipation.

[0004] This application provides a battery pack, including a first housing and a cell module housed within the first housing. The first housing includes a first opening. The cell module includes a plurality of cell assemblies arranged along a first direction. A first channel is formed between two adjacent cell assemblies, and the first channel communicates with the outside of the battery pack through the first opening. Each cell assembly includes at least one cell. Each cell includes a second housing, a first electrode terminal, and a second electrode terminal. The second housing includes a first end face and a second end face, and the first end face and the second end face are disposed opposite each other along a second direction perpendicular to the first direction. The first electrode terminal protrudes from the first end face, and the second electrode terminal protrudes from the second end face. The first channel extends along a third direction, which is perpendicular to both the first and second directions.

[0005] In this application, the first electrode terminal and the second electrode terminal are respectively disposed on both sides of the cell along the second direction, making the design size of the first electrode terminal and the second electrode terminal larger, which is beneficial for the cell to achieve high-rate discharge. When the cell discharges at a high rate, the temperature of the first electrode terminal and the second electrode terminal will rise rapidly. This application provides a first opening, which allows air convection to be formed between the first channel formed between adjacent cell components and the space outside the first housing, thereby improving the heat dissipation efficiency of the battery pack, reducing the temperature rise of the first electrode terminal and the second electrode terminal during high-rate discharge, and improving the safety performance and lifespan of the battery pack.

[0006] In one or more of the above optional embodiments, the first housing includes a top cover, a bottom cover, a first side plate, and a second side plate. Along the first direction, the top cover and the bottom cover are respectively disposed on both sides of the battery cell module. Along the second direction, the first side plate and the second side plate are respectively disposed on both sides of the battery cell module. The top cover is connected to the first side plate and the second side plate, and the bottom cover is connected to the first side plate and the second side plate. The top cover, the bottom cover, the first side plate, and the second side plate form a first opening, so that the entire battery cell module can be exposed to the outside of the first housing through the first opening, resulting in a large heat dissipation area and a good heat dissipation effect.

[0007] In one or more of the above optional embodiments, the battery cell assembly includes a protective structure that surrounds and encloses a portion of the battery cell. The protective structure can protect the battery cell and limit its disorderly expansion.

[0008] In one or more of the above optional embodiments, the protective structure includes a protective plate and a wrapping member; the second housing includes a main body and a first sealing part, the first sealing part is connected to the main body, the first sealing part and the first electrode terminal and the second electrode terminal are located on different sides of the main body, and the wrapping member wraps the main body and the first sealing part; the protective plate is fixed to the wrapping member, and / or the protective plate is fixed to the first sealing part.

[0009] In one or more of the above optional embodiments, the wrapping element includes a membrane, a metal housing, or an injection-molded housing.

[0010] In one or more of the above optional embodiments, the protective plate is disposed between the wrapping member and the battery cell; the first sealing part includes a first side sealing part and a second side sealing part, and along a third direction, the first side sealing part and the second side sealing part are respectively disposed on both sides of the main body; the protective plate includes a first protective plate and a second protective plate; the first protective plate, the second protective plate, the first side sealing part, the second side sealing part and the wrapping member satisfy: a) the first protective plate is fixed to the first side sealing part, and / or, the first protective plate is fixed to the wrapping member; b) the second protective plate is fixed to the second side sealing part, and / or, the second protective plate is fixed to the wrapping member.

[0011] In one or more of the above optional embodiments, the main body includes a first surface and a second surface, and the first surface and the second surface are disposed opposite to each other along the first direction; along the first direction, the protective plate is located between the first surface and the second surface, so that the arrangement of the protective plate will not affect the size of the first channel along the first direction, maintain the heat dissipation effect of the first channel, and the wrapping member can fit more tightly to the first surface and the second surface of the battery cell, so that the heat of the battery cell can be quickly transferred to the outside through the wrapping member.

[0012] In one or more of the above optional embodiments, the second housing further includes a second sealing portion, which includes a first top sealing portion and a second top sealing portion. The first top sealing portion and the second top sealing portion are respectively disposed on both sides of the main body portion along the second direction. Along the third direction, the projection of the protective plate covers the projection of the first sealing portion and the projection of the second sealing portion, so as to protect the first sealing portion and the second sealing portion, reduce the risk of the first sealing portion and the second sealing portion being squeezed, punctured, or deformed, and thus reduce the risk of cell leakage and short circuit.

[0013] In one or more of the above optional embodiments, the battery pack includes a first circuit board and a second circuit board electrically connected to the first circuit board; the first circuit board includes a first connecting circuit board and a second connecting circuit board, the first connecting circuit board being electrically connected to a first electrode terminal, and the second connecting circuit board being electrically connected to a second electrode terminal; wherein, the second connecting circuit board, the cell module, and the first connecting circuit board are arranged along a second direction, and the cell module and the second circuit board are arranged along a first direction. Positioning the first circuit board and the second circuit board on different sides of the cell module reduces the accumulation of heat generated by the first circuit board and the second circuit board, mitigating the mutual influence between the heat generated by the first circuit board and the heat generated by the second circuit board, thus facilitating heat dissipation.

[0014] In one or more of the above optional embodiments, the battery pack further includes a first heat-conducting element and a second heat-conducting element; the first heat-conducting element covers the first electrode terminal and is connected to the first side plate, and the second heat-conducting element covers the second electrode terminal and is connected to the second side plate. By providing the first heat-conducting element and the second heat-conducting element, the heat on the first electrode terminal and the second electrode terminal can be quickly transferred to the first side plate and the second side plate, respectively, thereby improving the heat dissipation effect.

[0015] In one or more of the above optional embodiments, a first insulating layer is provided on the first side plate, and a second insulating layer is provided on the second side plate; the first heat-conducting element is in contact with the first insulating layer, and the second heat-conducting element is in contact with the second insulating layer. By providing the first insulating layer and the second insulating layer, the risk of short circuits due to electrical connection between the first electrode terminal and the second electrode terminal and the housing can be reduced.

[0016] In one or more of the above optional embodiments, the battery pack further includes a first seal and a second seal; the first seal fills the gap between the first connecting circuit board and the first side plate, and the second seal fills the gap between the second connecting circuit board and the second side plate. The first seal and the second seal can respectively protect the first connecting circuit board and the second connecting circuit board, reducing the risk of corrosion of the circuit boards by moisture, salt spray, etc.

[0017] In one or more of the above optional embodiments, the second housing includes a first top sealing portion and a second top sealing portion, which are respectively disposed on both sides of the main body along the second direction; a first sealing member covers a portion of the first top sealing portion, and a second sealing member covers a portion of the second top sealing portion. By configuring the first sealing member and the second sealing member to respectively cover portions of the first and second top sealing portions, it is beneficial to improve the sealing performance (waterproof and corrosion-resistant) and structural strength of the first and second top sealing portions, and also to facilitate pressure relief inside the second housing.

[0018] In one or more of the above optional embodiments, the battery pack further includes: a first structural member connected to the first housing; the cell module, the first structural member, and the second circuit board are arranged along a first direction; along the first direction, the second circuit board is disposed on the side of the first structural member away from the cell module and is fixedly connected to the first structural member. By setting the first structural member to fix the second circuit board, the stability of the second circuit board can be improved.

[0019] In one or more of the above optional embodiments, the first structural member includes a main body and a bottom connected to the main body. The bottom is located on the side of the first structural member near the battery cell module and is configured as a heat sink. The bottom includes a second channel extending in a third direction. The bottom, configured as a heat sink, can dissipate heat from the second circuit board and the side of the battery cell module near the first structural member, further improving the heat dissipation effect.

[0020] In one or more of the above optional embodiments, the battery pack includes a communication harness, and the first structural member includes a first through hole through which the communication harness passes and is electrically connected to the second circuit board.

[0021] In one or more of the above optional embodiments, the first structural member includes a side portion connected to the main body, and a first through hole is located between the main body and the side portion.

[0022] In one or more of the above optional embodiments, the battery pack includes a connector, the first structural member includes a mounting portion disposed on the side; the connector is fixed to the mounting portion and electrically connected to the second circuit board.

[0023] In one or more of the above optional embodiments, the first through-hole includes a first sub-through-hole and a second sub-through-hole; the side portion includes a first side portion and a second side portion; the mounting portion includes a first mounting portion and a second mounting portion; the connector includes a first connector and a second connector; and the communication harness includes a first communication harness and a second communication harness. Along the second direction, the first side portion and the second side portion are respectively disposed on both sides of the main body. The first sub-through-hole is located between the first side portion and the main body, and the second sub-through-hole is located between the second side portion and the main body. The first communication harness passes through the first sub-through-hole and is electrically connected to the second circuit board, and the second communication harness passes through the second sub-through-hole and is electrically connected to the second circuit board. The first mounting portion is disposed on the first side portion, and the first connector is fixed to the first mounting portion and electrically connected to the second circuit board. The second mounting portion is disposed on the second side portion, and the second connector is fixed to the second mounting portion and electrically connected to the second circuit board. By configuring two communication harnesses and two connectors respectively disposed on both sides of the battery pack along the second direction, it is beneficial to bring the center of gravity of the battery pack closer to the center of the battery pack, making the structure of the battery pack more stable. The two connectors are located on opposite sides of the battery pack, preventing heat generation from affecting each other, improving heat dissipation, and reducing the risk of short circuits caused by the connectors being connected. The battery pack connects to external devices via these two connectors, which can be inserted or removed synchronously. This results in more even force distribution on both connectors, reduced contact resistance, easier insertion and removal, and reduced stress on the second circuit board. The separate placement of the two connectors on opposite sides of the battery pack allows for a larger connector size, which is beneficial for improving the battery pack's discharge rate.

[0024] In one or more of the above optional embodiments, the first side plate includes a first substrate and a first heat sink connected to the first substrate. Along the second direction, the first heat sink is disposed on the side of the first substrate away from the battery cell module. The first heat sink includes a third channel that extends along the first direction. And / or, the second side plate includes a second substrate and a second heat sink connected to the second substrate. Along the opposite direction of the second direction, the second heat sink is disposed on the side of the second substrate away from the battery cell module. The second heat sink includes a fourth channel that extends along the first direction.

[0025] In one or more of the above optional embodiments, the battery cell module includes a first elastic member, which is disposed within a first channel and in contact with the battery cell assembly. The first elastic member can serve as a support, allowing adjacent battery cell assemblies to form a first channel; the first elastic member can also be compressed to allow space for the expansion of the battery cell assembly.

[0026] In one or more of the above optional embodiments, the battery cell assembly includes a plurality of battery cells and a second elastic member. In a battery cell assembly, the plurality of battery cells are arranged along a first direction, and the second elastic member is disposed between adjacent battery cells. The second elastic member can be compressed to allow space for the expansion of the battery cells.

[0027] A second aspect of this application provides an electrical device, including a housing and any of the aforementioned battery packs; the housing includes a second opening and a third opening, arranged opposite to each other along a third direction, and the battery pack is disposed inside the housing; a first channel communicates with the outside of the electrical device through the second and third openings. External airflow flows directly into the first channel through the second opening and then flows out through the third opening, causing gas convection and good heat dissipation. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the battery pack structure in one embodiment.

[0029] Figure 2 is a structural schematic diagram of the battery pack from another perspective in one embodiment.

[0030] Figure 3 is a partially exploded view of the battery pack in one embodiment.

[0031] Figure 4 is a cross-sectional schematic diagram of the battery pack in one embodiment.

[0032] Figure 5 is an exploded view of the battery module and the first circuit board in one embodiment.

[0033] Figure 6 is a schematic diagram of the structure of the battery cell assembly in one embodiment.

[0034] Figure 7 is an exploded view of the battery cell assembly in one embodiment.

[0035] Figure 8 is a side view of a cell assembly in one embodiment.

[0036] Figure 9 is an exploded view of the first side plate / second side plate in one embodiment.

[0037] Figure 10 is a partially exploded view of the battery pack in another embodiment.

[0038] Figure 11 is a schematic diagram of the structure of the first structural component in one embodiment.

[0039] Figure 12 is a schematic diagram of the structure of the electrical equipment in one embodiment.

[0040] Figure 13 is a structural schematic diagram of the electrical equipment from another perspective in one embodiment.

[0041] Key component symbols: Battery pack 100, First housing 10, Cell module 20, First opening 10A, Cell assembly 201, Top cover 11, Bottom cover 12, First side plate 13, Second side plate 14, First elastic element 23, Cell 21, Second housing 212, Electrode terminal 211, First electrode terminal 211A, Second electrode terminal 211B, First end face 2121, Second end face 2122, Main body 212A, First sealing part 212B, Second sealing part 212C, Protective structure 22, Wrapping part 221, Protective plate 222, First side seal 212B1, Second side seal 212B2, First protective plate 222A, Second protective plate 222B, First top seal 212C1, Second top seal 212C2, First surface 212A1, Second surface 212A2, Second elastic element 24, First circuit board 30, Second circuit board 40, First connecting circuit board 31, Second connecting circuit board 32, Total positive electrode 91, Total negative electrode 92 First heat-conducting component 711 Second heat-conducting component 721 First insulating layer 15 Second insulating layer 16 First substrate 131 First heat sink 132 Heat sink 1321, 1421 Heat sink 1322, 1422, 521 Third channel 13A Mounting slot 1312, 1412 Second substrate 141 Second heat sink 142 Fourth channel 14A First sealing component 712 Second sealing component 722 First structural component 50 Main body 51 Bottom 52 Second channel 50A Communication harness 60 Side 53 First through hole 50B Second through hole 50C Mounting part 54 First side 531 Second side 532 First sub-through hole 50B1 Second sub-through hole 50B2 First communication harness 61 Second communication harness 62 First mounting part 541 Second mounting part 542 First connector 81 Second connector 82 Electrical equipment 200 Housing 210 Second opening 210A Third opening 210B Fourth opening 210C First direction Z Second direction X, third direction Y.

[0042] The following specific embodiments will further illustrate this application in conjunction with the above-described accompanying drawings. Detailed Implementation

[0043] The following specific embodiments are exemplary and not limiting, and are intended to provide a basic understanding of the present application, and are not intended to identify key or decisive elements of the present application or to limit the scope of protection.

[0044] When a component is considered "set on" another component, it can be directly set on the other component or may also be interspersed with other components. When a component is considered "connected to" or "attached to" another component, it can be directly connected to the other component or may also be interspersed with other components.

[0045] Unless otherwise defined, the term "multiple" in this document, when used to describe the number of components, specifically means that the component is two or more. In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0046] Some embodiments of this application will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0047] Please refer to Figures 1 and 2. One embodiment of this application provides a battery pack 100, including a first housing 10 and a cell module 20. The first housing 10 has a receiving cavity (not shown), and the cell module 20 is housed within the receiving cavity of the first housing 10. The first housing 10 includes a first opening 10A. The cell module 20 includes a plurality of cell assemblies 201, which are arranged along a first direction Z. A first channel 20A is formed between two adjacent cell assemblies 201. The first channel 20A communicates with the outside of the battery pack 100 through the first opening 10A. The first channel 20A extends along a third direction Y, which is perpendicular to the first direction Z. Air outside the first housing 10 and air inside the first channel 20A form convection through the first opening 10A, accelerating the heat dissipation of the cell assembly 201 and improving the heat dissipation effect. When the device equipped with battery pack 100 is stationary, such as when battery pack 100 is charging, it uses natural wind or external air cooling equipment for heat dissipation. When the device equipped with battery pack 100 is in motion, such as when a drone or electric bicycle is moving, battery pack 100 discharges. Due to the movement of the device, the airflow speed outside battery pack 100 is faster, which accelerates the heat dissipation speed of battery pack 100.

[0048] In some embodiments, the first housing 10 includes a top cover 11, a bottom cover 12, a first side plate 13, and a second side plate 14. The top cover 11 and the bottom cover 12 are disposed opposite each other along a first direction Z, and the first side plate 13 and the second side plate 14 are disposed opposite each other along a second direction X, which is perpendicular to the first direction Z and the third direction Y. The top cover 11 is connected to the first side plate 13 and the second side plate 14, and the bottom cover 12 is connected to the first side plate 13 and the second side plate 14, respectively. The top cover 11, the bottom cover 12, the first side plate 13, and the second side plate 14 form a first opening 10A, so that the entire cell module 20 is exposed to the outside of the first housing 10 through the first opening 10A, increasing the contact area between the external airflow and the cell module 20 when it enters the battery pack 100, thereby improving heat dissipation efficiency. Optionally, the top cover 11, the bottom cover 12, the first side plate 13, and the second side plate 14 are fixedly connected by means of screwing, welding, or other methods. Optionally, the top cover 11, bottom cover 12, first side plate 13, and second side plate 14 are integrally formed. Optionally, the first housing 10 includes a thermally conductive material to improve heat dissipation. Optionally, the thermally conductive material is aluminum or copper.

[0049] In some embodiments, there are two first openings 10A, arranged opposite each other along the third direction Y. Along the third direction Y, external airflow flows into the first housing 10 through one first opening 10A, flows through the first channel 20A, and then flows out through the other first opening 10A. The heat generated by the battery module 20 is quickly carried away by the airflow, improving heat dissipation efficiency.

[0050] Referring to Figures 3 and 4, in some embodiments, the battery cell module 20 includes a first elastic member 23, which is disposed within a first channel 20A and in contact with the battery cell assembly 201. The first elastic member 23 supports the battery cell assembly 201 and separates the battery cell assemblies 201, so that adjacent battery cell assemblies 201 form the first channel 20A. The first elastic member 23 has compressive deformation properties, providing space for the expansion of the battery cell assembly 201. Optionally, there may be multiple first elastic members 23 between two adjacent battery cell assemblies 201. Multiple first elastic members 23 provide stable support or uniform buffering, which is beneficial to improving the stability of the battery cell module 20. Optionally, there may be only one first elastic member 23 between two adjacent battery cell assemblies 201. For example, the first elastic member 23 is foam.

[0051] Referring to Figures 6 to 8, the battery cell assembly 201 includes a battery cell 21. The battery cell 21 includes a second housing 212, an electrode assembly (not shown), and electrode terminals 211. The electrode assembly is housed within the second housing 212, and the electrode terminals 211 are connected to the electrode assembly and extend out of the second housing 212. The electrode terminals 211 include a first electrode terminal 211A and a second electrode terminal 211B, which have different polarities, one being a positive terminal and the other a negative terminal. The second housing 212 includes a first end face 2121 and a second end face 2122 disposed opposite to each other along a second direction X. In some embodiments, the first electrode terminal 211A and the second electrode terminal 211B are disposed on one side of the battery cell 21 in the second direction X, and both the first electrode terminal 211A and the second electrode terminal 211B protrude from either the first end face 2121 or the second end face 2122. In other embodiments, the first electrode terminal 211A and the second electrode terminal 211B are disposed on opposite sides of the cell 21 in the second direction X. The first electrode terminal 211A protrudes from the first end face 2121, and the second electrode terminal 211B protrudes from the second end face 2122. Distributing the first electrode terminal 211A and the second electrode terminal 211B on opposite sides of the cell 21 allows for larger design dimensions of the first electrode terminal 211A and the second electrode terminal 211B, which is beneficial for the cell 21 to achieve high-rate discharge. During high-rate discharge, the temperature of the first electrode terminal 211A and the second electrode terminal 211B rises rapidly, requiring rapid dissipation of the heat on the first electrode terminal 211A and the second electrode terminal 211B.

[0052] In some embodiments, the second housing 212 is a packaging bag encapsulated with a film (such as aluminum-plastic film or steel-plastic film), meaning that the battery cell 21 is a soft-pack battery cell. In some embodiments, the second housing 212 is a metal housing, such as a steel housing or an aluminum housing.

[0053] In some embodiments, the second housing 212 includes a main body 212A, a first sealing portion 212B, and a second sealing portion 212C. The electrode assembly is housed within the main body 212A. Both the first sealing portion 212B and the second sealing portion 212C are connected to the main body 212A to seal it and prevent leakage. The first sealing portion 212B is located on a different side of the main body 212A from the first electrode terminal 211A and the second electrode terminal 211B. The first sealing portion 212B is located on at least one side of the main body 212A along a third direction Y. The second sealing portion 212C is located on a different side of the main body 212A from the first sealing portion 212B, and the electrode terminal 211 extends through the second sealing portion 212C into the second housing 212. The second sealing portion 212C is located on at least one side of the main body 212A along a second direction X.

[0054] In some embodiments, the battery cell assembly 201 includes a protective structure 22 surrounding the battery cell 21 and enclosing a portion of the battery cell 21. Specifically, the protective structure 22 at least surrounds the portion of the battery cell 21 located between the first end face 2121 and the second end face 2122. A first channel 20A is formed between the protective structures 22 of two adjacent battery cell assemblies 201, and a first elastic member 23 is in contact with the protective structure 22. Optionally, the protective structure 22 is made of a thermally conductive material to improve heat dissipation.

[0055] In some embodiments, the protective structure 22 includes a wrapping member 221. The wrapping member 221 generally has a hollow cylindrical structure with openings at both ends. The wrapping member 221 is disposed around the periphery of the battery cell 21 and wraps around the main body portion 212A and the first sealing portion 212B. The wrapping member 221 provides a binding force to the main body portion 212A, limiting the disorderly expansion of the main body portion 212A. The wrapping member 221 also protects the main body portion 212A and the first sealing portion 212B, reducing the risk of damage to the main body portion 212A and the first sealing portion 212B from external impacts. In some embodiments, the wrapping member 221 includes a membrane or a metal shell, for example, the membrane is a polyethylene film, a polypropylene film, or a polyester film, etc., and the metal shell is an aluminum shell, a stainless steel shell, etc. In some embodiments, the membrane is thinner, making it easier to transfer heat from the battery cell. In other embodiments, a membrane with good thermal conductivity is used, for example, a thermally conductive graphite film or a metal oxide film (such as an alumina film). In some other embodiments, the wrapping member 221 includes an injection-molded housing. Optionally, the injection-molded housing is formed by injection molding around the periphery of the cell 21. Optionally, the injection-molded housing is formed by injection molding and then fitted onto the cell 21.

[0056] In some embodiments, the protective structure 22 includes a protective plate 222. The protective plate 222 is disposed on at least one side of the battery cell 21 along a third direction Y and is disposed corresponding to the first sealing portion 212B to protect the first sealing portion 212B. In some embodiments, the protective plate 222 is disposed outside the wrapping member 221 and fixed to the wrapping member 221. In some embodiments, the protective plate 222 is disposed between the wrapping member 221 and the battery cell 21 and fixed to the wrapping member 221, or fixed to the first sealing portion 212B, or fixed to both the wrapping member 221 and the first sealing portion 212B. The protective plate 222 is fixed to the wrapping member 221 and / or the first sealing portion 212B by means of adhesion or the like. In some embodiments, the protective plate 222 is fixed to the battery cell 21 by the binding force provided by the wrapping member 221. In some embodiments, the protective plate 222 is made of an insulating material, for example, the material of the protective plate 222 is plastic.

[0057] In some embodiments, the protective plate 222 is disposed corresponding to the second sealing portion 212C. Along the third direction Y, the projection of the protective plate 222 overlaps the projections of the first sealing portion 212B and the second sealing portion 212C. The protective plate 222 provides protection for the first sealing portion 212B and the second sealing portion 212C, reducing the risk of damage to the first sealing portion 212B and the second sealing portion 212C from external forces.

[0058] In some embodiments, the first sealing portion 212B includes a first side sealing portion 212B1 and a second side sealing portion 212B2. Along the third direction Y, the first side sealing portion 212B1 and the second side sealing portion 212B2 are respectively disposed on both sides of the main body portion 212A. The protective plate 222 includes a first protective plate 222A and a second protective plate 222B. Along the third direction Y, the first protective plate 222A and the second protective plate 222B are respectively disposed on both sides of the battery cell 21, with the first protective plate 222A corresponding to the first side sealing portion 212B1 and the second protective plate 222B corresponding to the second side sealing portion 212B2. In some embodiments, the first protective plate 222A is fixed to the first side sealing portion 212B1, or the first protective plate 222A is fixed to the wrapping member 221, or the first protective plate 222A is fixed to both the first side sealing portion 212B1 and the wrapping member 221. In some embodiments, the second protective plate 222B is fixed to the second side seal 212B2, or the second protective plate 222B is fixed to the wrapping member 221, or the second protective plate 222B is fixed to both the second side seal 212B2 and the wrapping member 221.

[0059] In some embodiments, the second sealing portion 212C includes a first top sealing portion 212C1 and a second top sealing portion 212C2, which are respectively disposed on both sides of the main body portion 212A along the second direction X. A first electrode terminal 211A extends out of the first top sealing portion 212C1, and a second electrode terminal 211B extends out of the second top sealing portion 212C2. In some embodiments, along the third direction Y, the projection of the first protective plate 222A covers the projection of the first side sealing portion 212B1, the projection of the first top sealing portion 212C1, and the projection of the second top sealing portion 212C2, and the projection of the second protective plate 222B covers the projection of the second side sealing portion 212B2, the projection of the first top sealing portion 212C1, and the projection of the second top sealing portion 212C2.

[0060] In some embodiments, the main body 212A includes a first surface 212A1 and a second surface 212A2. Along the first direction Z, the first surface 212A1 and the second surface 212A2 are disposed opposite each other. Along the first direction Z, a protective plate 222 is located between the first surface 212A1 and the second surface 212A2, ensuring that the arrangement of the protective plate 222 does not affect the dimension of the first channel 20A along the first direction Z, maintaining the heat dissipation effect of the first channel 20A. The wrapping member 221 fits more tightly against the first surface 212A1 and the second surface 212A2, facilitating faster heat transfer from the battery cell 21 to the outside through the wrapping member. It is understood that when the battery cell assembly 201 includes one battery cell, along the first direction, the protective plate 222 does not extend beyond the first surface 212A1 and the second surface 212A2 of that battery cell. When the battery cell assembly 201 includes multiple battery cells, along the first direction Z, the protective plate 222 does not extend beyond the second surface 212A2 of the first battery cell and the first surface 212A1 of the last battery cell. For example, the battery cell assembly 201 includes two battery cells, with the first battery cell and the second battery cell arranged along the first direction Z. Then, along the first direction Z, the protective plate 222 does not exceed the second surface 212A2 of the first battery cell and the first surface 212A1 of the second battery cell.

[0061] In some embodiments, the battery cell assembly 201 includes a plurality of battery cells 21 and a second elastic member 24. In a battery cell assembly 201, the plurality of battery cells 21 are arranged along a first direction Z, and the second elastic member 24 is disposed between adjacent battery cells 21 and in contact with the battery cells 21. The second elastic member 24 supports the battery cells 21 and separates the battery cells 21, so that adjacent battery cells 21 in a battery cell assembly 201 form a channel to prevent the heat generated by adjacent battery cells 21 from affecting each other. The second elastic member 24 has the property of compression deformation, providing space for the expansion of the battery cells 21. Optionally, in a battery cell assembly 201, there are one or more second elastic members 24 between two adjacent battery cells 21, and the second elastic member 24 fills the entire or part of the gap between two adjacent battery cells 21. In the case where the cell assembly 201 includes a plurality of cells 21, along the third direction Y, the projection of the protective plate 222 covers the projection of the first sealing portion 212B and the second sealing portion 212C of the plurality of cells 21; along the first direction Z, the protective plate 222 is located between the two surfaces of the body portion 212A of the plurality of cells 21 that are furthest apart.

[0062] Referring to Figures 3, 5, and 6, in some embodiments, the battery pack 100 includes a first circuit board 30 and a second circuit board 40. The electrode terminals 211 of the battery cells 21 are electrically connected to the first circuit board 30, allowing the battery cells 21 in a single battery cell assembly 201 to be connected in series or parallel, and multiple battery cell assemblies 201 to be connected in series or parallel. Optionally, the first circuit board 30 includes a flexible circuit board. Optionally, the first circuit board 30 includes a printed circuit board. The second circuit board 40 is electrically connected to the first circuit board 30. The first circuit board 30 and the battery cell module 20 are arranged along a second direction X, and the battery cell module 20 and the second circuit board 40 are arranged along a first direction Z. Placing the first circuit board 30 and the second circuit board 40 on different sides of the battery cell module 20 avoids the accumulation of heat generated by the first circuit board 30 and the second circuit board 40 together, reducing the mutual influence between the heat generated by the first circuit board 30 and the heat generated by the second circuit board 40, thus facilitating heat dissipation.

[0063] In some embodiments, the second circuit board 40 can collect information such as current, voltage, and temperature. Optionally, the second circuit board 40 includes a Battery Management System (BMS) component. Specifically, the BMS component includes multiple electronic components capable of performing functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission for the battery. Optionally, the second circuit board 40 includes a flexible circuit board. Optionally, the second circuit board 40 includes a printed circuit board.

[0064] In some embodiments, the first circuit board 30 includes a first connecting circuit board 31 and a second connecting circuit board 32. The first connecting circuit board 31 is electrically connected to the first electrode terminal 211A of the battery cell 21, and the second connecting circuit board 32 is electrically connected to the second electrode terminal 211B of the battery cell 21. The second connecting circuit board 32, the battery cell module 20, and the first connecting circuit board 31 are arranged along a second direction X.

[0065] Referring to Figures 3 and 4, in some embodiments, the battery pack 100 includes a first thermally conductive element 711 and a second thermally conductive element 721. The first thermally conductive element 711 covers the first electrode terminal 211A and is connected to the first side plate 13. Heat on the first electrode terminal 211A is transferred to the first side plate 13 through the first thermally conductive element 711 and dissipated through the first side plate 13, improving heat dissipation. The second thermally conductive element 721 covers the second electrode terminal 211B and is connected to the second side plate 14. Heat on the second electrode terminal 211B is transferred to the second side plate 14 through the second thermally conductive element 721 and dissipated through the second side plate 14. Optionally, the first thermally conductive element 711 is made of an insulating material, such as a thermally conductive silicone pad or a thermally conductive adhesive. Optionally, the thermal conductivity of the first thermally conductive element 711 is greater than 1 W / (mK). Optionally, the second thermally conductive element 721 is made of an insulating material, such as a thermally conductive silicone pad or a thermally conductive adhesive. Optionally, the thermal conductivity of the second heat-conducting element 721 is greater than 1 W (mK).

[0066] In some embodiments, a first insulating layer 15 is provided on the first side plate 13. Along the second direction X, the first insulating layer 15 is located between the first side plate 13 and the battery cell module 20. The first heat-conducting element 711 is in contact with the first insulating layer 15. The first insulating layer 15 isolates the first heat-conducting element 711 and the first side plate 13, thereby electrically isolating the first electrode terminal 211A from the first side plate 13, reducing the risk of a short circuit due to the first electrode terminal 211A being electrically connected to the first side plate 13. In some embodiments, the first insulating layer 15 is provided on the first heat-conducting element 711, and the first insulating layer 15 is in contact with the first side plate 13. Optionally, the first insulating layer 15 is applied to the first side plate 13 or the first insulating layer 15 by spraying.

[0067] In some embodiments, a second insulating layer 16 is provided on the second side plate 14. Along the second direction X, the second insulating layer 16 is located between the cell module 20 and the second side plate 14. The second heat-conducting element 721 is in contact with the second insulating layer 16. The second insulating layer 16 isolates the second heat-conducting element 721 and the second side plate 14, thereby electrically isolating the second electrode terminal 211B from the second side plate 14, reducing the risk of a short circuit due to the second electrode terminal 211B being electrically connected to the second side plate 14. In some embodiments, the second insulating layer 16 is provided on the second heat-conducting element 721, and the second insulating layer 16 is in contact with the second side plate 14.

[0068] Referring to Figures 3 and 9, in some embodiments, the first side plate 13 includes a first substrate 131 and a first heat sink 132 connected to the first substrate 131. Along the second direction X, the first heat sink 132 is disposed on the side of the first substrate 131 away from the cell module 20. The first heat sink 132 includes a heat sink 1321 and a plurality of heat sink fins 1322 disposed on the heat sink 1321. A third channel 13A is formed between adjacent heat sink fins 1322, and the third channel 13A extends along the first direction Z. Airflow carries away heat from the first side plate 13 through the third channel 13A. By aligning the extension direction of the third channel 13A with the stacking direction of the plurality of cell modules 201, it is beneficial to improve the uniformity of heat dissipation for each cell module 201 and reduce the temperature difference between the individual cell modules 201. In some embodiments, the first substrate 131 is provided with a mounting groove 1312 extending along the second direction X, the heat sink 1321 is accommodated in the mounting groove 1312, and the heat sink 1322 protrudes out of the mounting groove 1312. This is beneficial to reduce the size of the first side plate 13 along the second direction X, which is beneficial to the miniaturization of the battery pack 100.

[0069] In some embodiments, the second side plate 14 includes a second substrate 141 and a second heat sink 142 connected to the second substrate 141. The second heat sink 142 is disposed on the side of the second substrate 141 away from the cell module 20, in the opposite direction to the second direction X. The second heat sink 142 includes a heat sink 1421 and a plurality of heat sink fins 1422 disposed on the heat sink 1421. A fourth channel 14A is formed between adjacent heat sink fins 1422, and the fourth channel 14A extends in the first direction Z. Airflow carries away heat from the second side plate 14 through the fourth channel 14A. By aligning the extension direction of the fourth channel 14A with the stacking direction of the plurality of cell modules 201, it is beneficial to improve the uniformity of heat dissipation for each cell module 201 and reduce the temperature difference between each cell module 201. In some embodiments, the second substrate 141 is provided with a mounting groove 1412 extending along the second direction X, the heat sink 1421 is accommodated in the mounting groove 1412, and the heat sink 1422 protrudes out of the mounting groove 1412. This is beneficial to reduce the size of the second side plate 14 along the second direction X, and to facilitate the miniaturization of the battery pack 100.

[0070] Referring to Figures 3 and 4, in some embodiments, the battery pack 100 includes a first seal 712 and a second seal 722. The first seal 712 fills the gap between the first connecting circuit board 31 and the first side plate 13. The second seal 722 fills the gap between the second connecting circuit board 32 and the second side plate 14. The first seal 712 protects the first connecting circuit board 31, and the second seal 722 protects the second connecting circuit board 32, reducing the risk of the first circuit board 30 failing due to corrosion from moisture, salt spray, etc. The first seal 712 and the second seal 722 also serve a fixing function, improving the stability of the components inside the battery pack 100. It should be noted that in Figure 4, to clearly show the relationship between the components, neither the first seal 712 nor the second seal 722 is shown with cross-sectional lines; only the outline of the first seal 712 away from the first side plate 13 and the outline of the second seal 722 away from the second side plate 14 are shown.

[0071] In some embodiments, the first seal 712 covers the portion of the first electrode terminal 211A that protrudes from the second housing 212, and the second seal 722 covers the portion of the second electrode terminal 211B that protrudes from the second housing 212, thereby reducing the risk of the electrode terminal 211 failing due to corrosion from moisture, salt spray, etc.

[0072] In some embodiments, the first seal 712 covers a portion of the first top seal 212C1, and the second seal 722 covers a portion of the second top seal 212C2. Optionally, the first seal 712 covers the portion of the first top seal 212C1 near the first end face 2121 and away from the main body 212A, which improves the sealing effect of the first top seal 212C1, reduces corrosion of the first top seal 212C1 by moisture or salt spray, and reduces the risk of leakage. The portion of the first top seal 212C1 near the main body 212A and away from the first end face 2121 is not covered by the first seal 712, which facilitates pressure relief. Optionally, the second seal 722 covers the portion of the second top seal 212C2 near the second end face 2112 and away from the main body 212A, which reduces corrosion of the second top seal 212C2 by moisture or salt spray and reduces the risk of leakage. The portion of the second top seal 212C2 that is close to the main body 212A and far from the second end face 2122 is not covered by the second seal 722, which is beneficial for pressure relief.

[0073] In some embodiments, both the first seal 712 and the second seal 722 include a potting compound. Optionally, the potting compound is a two-component mixed silicone, polyurethane, or epoxy resin liquid substance with excellent temperature resistance, insulation, mechanical strength, flowability, adhesion, corrosion resistance, and certain thermal conductivity.

[0074] In some embodiments, both the first seal 712 and the second seal 722 comprise expanding foam. The expanding foam is lightweight and has a porous structure, which helps to improve the cushioning effect and protect the battery module 20.

[0075] In some embodiments, the first seal 712 and the second seal 722 have thermal conductivity, which facilitates the rapid transfer of heat from the first circuit board 30 and the electrode terminals 211 to the first housing 10, thereby improving heat dissipation. Optionally, both the first seal 712 and the second seal 722 comprise thermally conductive silicone. In some embodiments, the thermal conductivity of both the first seal 712 and the second seal 722 is greater than 0.2 W / (mK).

[0076] Referring to Figures 3, 4, 10, and 11, in some embodiments, the battery pack 100 includes a first structural member 50. The first structural member 50 is connected to the first housing 10. The cell module 20, the first structural member 50, and the second circuit board 40 are arranged along a first direction Z. Along the first direction Z, the second circuit board 40 is disposed on the side of the first structural member 50 away from the cell module 20 and is fixedly connected to the first structural member 50. The first structural member 50 serves to fix the second circuit board 40. Optionally, one end of the first structural member 50 is disposed between the top cover 11 and the first side plate 13 and is fixedly connected by bolts, and the other end of the first structural member 50 is disposed between the top cover 11 and the second side plate 14 and is fixedly connected by bolts.

[0077] In some embodiments, the first structural member 50 includes a main body 51 and a bottom 52 connected to the main body 51. The main body 51 is generally plate-shaped. The bottom 52 is located on the side of the first structural member 50 near the cell module 20 and is configured as a heat sink. The bottom 52 includes a plurality of heat sink fins 521, and a second channel 50A is formed between adjacent heat sink fins 521, extending in a third direction Y. The bottom 52, configured as a heat sink, dissipates heat from the second circuit board 40 and the side of the cell module 20 near the first structural member 50, improving the heat dissipation effect. The extension direction of the second channel 50A is consistent with the extension direction of the first channel 20A, which is beneficial to improving the heat dissipation effect. Optionally, the main body 51 and the bottom 52 are integrally formed. Optionally, the main body 51 and the bottom 52 are connected by welding, bonding, or other methods.

[0078] In some embodiments, the second channel 50A is connected to the outside of the battery pack 100 through the first opening 10A. External airflow flows directly into the second channel 50A through the first opening 10A, which helps to improve heat dissipation efficiency.

[0079] In some embodiments, the battery pack 100 includes a communication harness 60, one end of which is electrically connected to the first circuit board 30. The first structural member 50 includes a first through-hole 50B, through which the other end of the communication harness 60 is electrically connected to the second circuit board 40. Optionally, the first through-hole 50B is located on the main body 51. The communication harness 60 is used to collect information such as the voltage and temperature of the battery cell 21 and transmit this information to the second circuit board 40.

[0080] In some embodiments, the first structural member 50 includes a side portion 53 connected to the main body 51, and a first through hole 50B is located between the main body 51 and the side portion 53. Optionally, the main body 51 and the side portion 53 are integrally formed. Optionally, the main body 51 and the side portion 53 are connected by welding or other means.

[0081] In some embodiments, the battery pack 100 includes a connector 80. The first structural member 50 includes a mounting portion 54 disposed on a side portion 53. The connector 80 is fixed to the mounting portion 54 and electrically connected to the second circuit board 40. Optionally, the mounting portion 54 is generally a protrusion. Optionally, the mounting portion 54, the main body 51, the bottom 52, and the side portion 53 are integrally formed. Optionally, the mounting portion 54 and the side portion 53 are connected by screws or other means.

[0082] In some implementations, connector 80 is a socket, and connector 80 is configured to transmit current and / or signals from battery pack 100.

[0083] In some embodiments, side portion 53 includes a first side portion 531 and a second side portion 532, which are respectively disposed on both sides of the main body 51 along the second direction X. The first through hole 50B includes a first sub-through hole 50B1 and a second sub-through hole 50B2. The first sub-through hole 50B1 is located between the first side portion 531 and the main body 51, and the second sub-through hole 50B2 is located between the second side portion 532 and the main body 51. The communication harness 60 includes a first communication harness 61 and a second communication harness 62. The first communication harness 61 is electrically connected to the first connecting circuit board 31, and the second communication harness 62 is electrically connected to the second connecting circuit board 32. The first communication harness 61 passes through the first sub-through hole 50B1 and is electrically connected to the second circuit board 40. The second communication harness 62 passes through the second sub-through hole 50B2 and is electrically connected to the second circuit board 40. Mounting section 54 includes a first mounting section 541 and a second mounting section 542. The first mounting section 541 is located on the first side section 531, and the second mounting section 542 is located on the second side section 532. Connector 80 includes a first connector 81 and a second connector 82. The first connector 81 is fixed to the first mounting section 541 and electrically connected to the second circuit board 40. The second connector 82 is fixed to the second mounting section 542 and connected to the second circuit board 40. By configuring two communication harnesses 60 and two connectors 80 respectively located on both sides of the battery pack 100 along the second direction X, the center of gravity of the battery pack 100 is brought closer to its center, making the structure of the battery pack 100 more stable. The two connectors are respectively located on both sides of the battery pack 100, preventing the heat generated by the two connectors from affecting each other, improving heat dissipation, and reducing the risk of short circuits caused by the connection of the two connectors. The battery pack 100 connects to external devices via two connectors. These connectors can be inserted or removed synchronously, resulting in more even force distribution, reduced contact resistance, easier insertion and removal, and reduced stress on the second circuit board 40. The two connectors are located on opposite sides of the battery pack 100, allowing for a larger connector design, which is beneficial for improving the discharge rate of the battery pack 100.

[0084] In some embodiments, the battery pack 100 includes a total positive electrode 91 and a total negative electrode 92, which are respectively connected to a first circuit board 30 and a second circuit board 40. Optionally, the total positive electrode 91 and the total negative electrode 92 are located on one side of the cell module 20 along the second direction X, with the total positive electrode 91 electrically connected to the first connecting circuit board 31 and the second circuit board 40, and the total negative electrode 92 electrically connected to the first connecting circuit board 31 and the second circuit board 40. Optionally, the total positive electrode 91 and the total negative electrode 92 are located on both sides of the cell module 20 along the second direction X, with the total positive electrode 91 electrically connected to the first connecting circuit board 31 and the second circuit board 40, and the total negative electrode 92 electrically connected to the second connecting circuit board 32 and the second circuit board 40.

[0085] In some embodiments, the first structural member 50 includes a second through hole 50C, through which the main negative terminal 92 is electrically connected to the second circuit board 40. The main positive terminal 91 is electrically connected to the second circuit board 40 through a second sub-through hole 50B2. Optionally, the second through hole 50C is located between the first side portion 531 and the main body 51, and the second through hole 50C and the second sub-through hole 50B2 are located on the same side of the main body 51, and the second through hole 50C and the second sub-through hole 50B2 are not connected. Optionally, the second through hole 50C and the second sub-through hole 50B2 are connected.

[0086] Please refer to Figures 12 and 13. One embodiment of this application provides an electrical device 200, including a housing 210 and a battery pack 100, with the battery pack 100 disposed within the housing 210. The housing 210 includes a second opening 210A and a third opening 210B. Along a third direction Y, the second opening 210A and the third opening 210B are positioned opposite each other. A first channel 20A communicates with the outside of the electrical device 200 through the second opening 210A and the third opening 210B. External airflow flows directly into the first channel 20A through the second opening 210A and then flows out through the third opening 210B, creating convection and good heat dissipation. The electrical device 200 can be an energy storage product, a drone, a unicycle or two-wheeled or more electric vehicle, or an electric cleaning tool, etc.

[0087] In some embodiments, housing 210 includes a fourth opening 210C, which is located on a different side of housing 210 from the second opening 210A and the third opening 210B. Battery pack 100 is mounted inside housing 210 through the fourth opening 210C. The top or bottom cover of battery pack 100 is exposed to the outside of housing 210 through the fourth opening 210C.

[0088] Those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments fall within the scope of this application.

Claims

1. A battery pack, characterized in that, include: A first housing, the first housing including a first opening; A battery cell module is housed in the first housing. The battery cell module includes multiple battery cell components arranged along a first direction. A first channel is formed between two adjacent battery cell components. The first channel communicates with the outside of the battery pack through the first opening. The battery cell assembly includes at least one battery cell. The battery cell includes a second housing, a first electrode terminal, and a second electrode terminal. The second housing includes a first end face and a second end face. Along a second direction perpendicular to the first direction, the first end face and the second end face are disposed opposite to each other. The first electrode terminal protrudes from the first end face, and the second electrode terminal protrudes from the second end face. The first channel extends along a third direction, which is perpendicular to both the first and second directions.

2. The battery pack as described in claim 1, characterized in that, The first housing includes a top cover, a bottom cover, a first side plate, and a second side plate. Along the first direction, the top cover and the bottom cover are respectively disposed on both sides of the battery cell module. Along the second direction, the first side plate and the second side plate are respectively disposed on both sides of the battery cell module. The top cover is connected to the first side plate and the second side plate respectively, and the bottom cover is connected to the first side plate and the second side plate respectively. The top cover, the bottom cover, the first side plate and the second side plate form the first opening.

3. The battery pack as described in claim 1 or 2, characterized in that, The battery cell assembly includes a protective structure that surrounds the battery cell and encloses a portion of the battery cell.

4. The battery pack as described in claim 3, characterized in that, The protective structure includes a protective plate and a wrapping component; The second housing includes a main body and a first sealing part, the first sealing part being connected to the main body, the first sealing part being located on different sides of the main body from the first electrode terminal and the second electrode terminal, and the wrapping member wrapping the main body and the first sealing part; The protective plate is fixed to the wrapping member, and / or the protective plate is fixed to the first sealing part.

5. The battery pack as described in claim 4, characterized in that, The wrapping element includes a membrane, a metal shell, or an injection-molded shell.

6. The battery pack as described in claim 4 or 5, characterized in that, The protective plate is disposed between the wrapping component and the battery cell; The first sealing portion includes a first side sealing portion and a second side sealing portion, and along the third direction, the first side sealing portion and the second side sealing portion are respectively disposed on both sides of the main body portion; The protective plate includes a first protective plate and a second protective plate; The first protective plate, the second protective plate, the first side seal, the second side seal, and the wrapping member satisfy the following: a) The first protective plate is fixed to the first side seal, and / or the first protective plate is fixed to the wrapping member; b) The second protective plate is fixed to the second side seal, and / or the second protective plate is fixed to the wrapping member.

7. The battery pack as described in claim 6, characterized in that, The main body includes a first surface and a second surface, and the first surface and the second surface are disposed opposite to each other along the first direction; Along the first direction, the protective plate is located between the first surface and the second surface.

8. The battery pack as claimed in any one of claims 4 to 7, characterized in that, The second housing further includes a second sealing portion, which includes a first top sealing portion and a second top sealing portion, wherein the first top sealing portion and the second top sealing portion are respectively disposed on both sides of the main body portion along the second direction; Along the third direction, the projection of the protective plate covers the projection of the first sealing portion and the projection of the second sealing portion.

9. The battery pack as described in any one of claims 2 to 8, characterized in that, The battery pack includes a first circuit board and a second circuit board electrically connected to the first circuit board; The first circuit board includes a first connecting circuit board and a second connecting circuit board, wherein the first connecting circuit board is electrically connected to the first electrode terminal, and the second connecting circuit board is electrically connected to the second electrode terminal; The second connecting circuit board, the battery cell module, and the first connecting circuit board are arranged along the second direction, and the battery cell module and the second circuit board are arranged along the first direction.

10. The battery pack as claimed in claim 9, characterized in that, The battery pack also includes a first heat-conducting component and a second heat-conducting component; The first heat-conducting component covers the first electrode terminal and is connected to the first side plate, and the second heat-conducting component covers the second electrode terminal and is connected to the second side plate.

11. The battery pack as claimed in claim 10, characterized in that, A first insulating layer is provided on the first side plate, and a second insulating layer is provided on the second side plate; The first heat-conducting component is in contact with the first insulating layer, and the second heat-conducting component is in contact with the second insulating layer.

12. The battery pack as claimed in any one of claims 9 to 11, characterized in that, The battery pack also includes a first seal and a second seal; The first seal fills the gap between the first connecting circuit board and the first side plate, and the second seal fills the gap between the second connecting circuit board and the second side plate.

13. The battery pack as claimed in claim 12, characterized in that, The second housing includes a first top sealing portion and a second top sealing portion, and along the second direction, the first top sealing portion and the second top sealing portion are respectively disposed on both sides of the main body portion; The first seal covers a portion of the first top seal, and the second seal covers a portion of the second top seal.

14. The battery pack as claimed in any one of claims 9 to 13, characterized in that, The battery pack also includes: A first structural component is connected to the first housing, and the battery cell module, the first structural component, and the second circuit board are arranged along the first direction; Along the first direction, the second circuit board is disposed on the side of the first structural member away from the battery cell module and is fixedly connected to the first structural member.

15. The battery pack as claimed in claim 14, characterized in that, The first structural component includes a main body and a bottom connected to the main body. The bottom is located on the side of the first structural component near the battery cell module and is configured as a heat sink. The bottom includes a second channel that extends along the third direction.

16. The battery pack as claimed in claim 14 or 15, characterized in that, The battery pack includes a communication harness, and the first structural member includes a first through hole through which the communication harness passes and is electrically connected to the second circuit board.

17. The battery pack as claimed in claim 16, characterized in that, The first structural member includes a side portion connected to the main body, and the first through hole is located between the main body and the side portion.

18. The battery pack as claimed in claim 17, characterized in that, The battery pack includes a connector, and the first structural member includes a mounting portion, which is disposed on the side portion; The connector is fixed to the mounting part and electrically connected to the second circuit board.

19. The battery pack as claimed in claim 18, characterized in that, The first through hole includes a first sub-through hole and a second sub-through hole, the side portion includes a first side portion and a second side portion, the mounting portion includes a first mounting portion and a second mounting portion, the connector includes a first connector and a second connector, and the communication harness includes a first communication harness and a second communication harness. Along the second direction, the first side and the second side are respectively disposed on both sides of the main body, the first sub-through hole is located between the first side and the main body, the second sub-through hole is located between the second side and the main body, the first communication harness passes through the first sub-through hole and is electrically connected to the second circuit board, and the second communication harness passes through the second sub-through hole and is electrically connected to the second circuit board. The first mounting portion is disposed on the first side portion, and the first connector is fixed to the first mounting portion and electrically connected to the second circuit board. The second mounting portion is located on the second side, and the second connector is fixed to the second mounting portion and electrically connected to the second circuit board.

20. The battery pack as claimed in any one of claims 2 to 19, characterized in that, The first side plate includes a first substrate and a first heat sink connected to the first substrate. Along the second direction, the first heat sink is disposed on the side of the first substrate away from the cell module. The first heat sink includes a third channel, which extends along the first direction. and / or The second side plate includes a second substrate and a second heat sink connected to the second substrate. In the opposite direction of the second direction, the second heat sink is disposed on the side of the second substrate away from the cell module. The second heat sink includes a fourth channel that extends along the first direction.

21. The battery pack as claimed in any one of claims 1 to 20, characterized in that, The battery cell module includes a first elastic element, which is disposed in the first channel and is in contact with the battery cell assembly.

22. The battery pack as claimed in any one of claims 1 to 21, characterized in that, The battery cell assembly includes a plurality of battery cells and a second elastic member. In one battery cell assembly, the plurality of battery cells are arranged along the first direction, and the second elastic member is disposed between adjacent battery cells.

23. An electrical appliance, characterized in that, Includes a housing and a battery pack as claimed in any one of claims 1 to 22; The housing includes a second opening and a third opening. Along the third direction, the second opening and the third opening are disposed opposite to each other, and the battery pack is disposed inside the housing. The first channel is connected to the outside of the electrical equipment through the second opening and the third opening.

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