Battery pack, electric device and method for manufacturing battery pack

Abstract

The present application provides a battery pack, an electrical device and a method for manufacturing the battery pack, wherein the battery pack comprises a shell, a battery module and a first heat-conducting member; the shell is U-shaped, and comprises a bottom plate, a first side plate and a second side plate, and the bottom plate connects the first side plate and the second side plate; the battery module is located between the first side plate and the second side plate, and along a first direction, there is a first gap between the first side plate and the battery module; the first heat-conducting member is arranged in the first gap, and the battery module and the first side plate are connected by the first heat-conducting member; the first side plate and the second side plate are configured to move away from each other under the action of an external force so as to place the battery module in the shell, and after the external force is removed, the first side plate and the second side plate can be reset in a direction approaching each other, so that the heat conduction path between the battery module and the first side plate of the shell and between the battery module and the second side plate is smaller, thereby improving the heat dissipation capacity of the battery pack.

Description

Battery pack, electrical equipment, and method for manufacturing battery pack Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery pack, an electrical device, and a method for manufacturing a battery pack. Background Art

[0002] When the battery pack is used under high-rate, non-static, and continuous charging and discharging conditions (such as agricultural drone battery packs), the battery cell temperature will be too high, which is not conducive to the use of the battery pack.

[0003] Summary of the Invention

[0004] Embodiments of the present application provide a battery pack, an electrical device, and a method for manufacturing the battery pack to improve the heat dissipation capability of the battery pack.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising a shell, a battery module and a first heat conductive member; the shell is U-shaped, comprising a bottom plate, a first side plate and a second side plate, the first side plate and the second side plate are arranged opposite to each other along a first direction, and the bottom plate connects the first side plate and the second side plate; the battery module is located between the first side plate and the second side plate, the battery module comprises a plurality of battery cells, and along the first direction, there is a first gap between the first side plate and the battery module; the first heat conductive member is arranged in the first gap, and the battery module and the first side plate are connected via the first heat conductive member; the first side plate and the second side plate are configured to move away from each other under the action of an external force so as to place the battery module in the shell.

[0006] In the above technical solution, during the assembly of the battery pack, the first side plate and the second side plate move away from each other under the action of an external force, and the distance between the first side plate and the second side plate gradually increases in a direction away from the bottom plate. The shell then forms a larger entrance at the end away from the bottom plate, providing space for the clamp to clamp the battery module into the shell, facilitating the battery module's entry into the shell. After the external force is removed, the first side plate and the second side plate can be reset in a direction toward each other. In this way, along the first direction, the gap between the first side plate and the battery module, as well as the gap between the second side plate and the battery module, are both smaller, shortening the heat conduction path between the battery module and the first side plate of the shell, and between the battery module and the second side plate, thereby improving the heat dissipation capacity of the battery pack. The first heat conductor is provided between the first side plate and the battery module to improve the heat exchange efficiency between the battery module and the first side plate, thereby further improving the heat dissipation efficiency of the battery pack.

[0007] In some embodiments of the first aspect of the present application, the battery pack also includes a first end plate and a second end plate, and the first end plate and the second end plate are arranged along the second direction; the first side plate and the second side plate are both fixedly connected to the first end plate, and the first side plate and the second side plate are both fixedly connected to the second end plate, and the first end plate, the second end plate and the shell constitute a box body with a first opening, the first opening is opposite to the bottom plate, and the battery module is accommodated in the box body.

[0008] In the above technical solution, the first end plate, the second end plate and the shell together form a box body with a first opening. The first opening facilitates the entry of the battery module into the box, and the box body can better protect the battery module, which is beneficial to improving the safety performance of the battery pack and reducing the risk of damage to the structure inside the box. The first side plate and the second side plate are both fixedly connected to the first end plate, and the first side plate and the second side plate are both fixedly connected to the second end plate, which is beneficial to improving the structural strength of the box body. The first end plate and the second end plate also have a restraining effect on the first side plate and the second side plate, alleviating the problem of the first side wall and the second side wall deforming in a direction away from each other.

[0009] In some embodiments of the first aspect of the present application, along the first direction, a length of the first gap is 0.05 mm to 2.5 mm.

[0010] In the above technical solution, along the first direction, the length of the first gap is 0.05mm to 2.5mm, so the heat conduction path between the battery module and the first side plate is shorter, so that the heat conduction path from the battery module to the first side plate is smaller, thereby improving the heat dissipation capacity of the battery pack.

[0011] In some embodiments of the first aspect of the present application, along the first direction, the length of the first gap is 0.1 mm to 1.9 mm.

[0012] In the above technical solution, along the first direction, the length of the first gap is 0.1mm to 1.9mm, which further shortens the heat conduction path between the battery module and the first side plate, making the heat conduction path from the battery module to the first side plate smaller, thereby further improving the heat dissipation capacity of the battery pack.

[0013] In some embodiments of the first aspect of the present application, along the first direction, the length of the first gap is 0.1 mm to 1.4 mm.

[0014] In the above technical solution, along the first direction, the length of the first gap is 0.1mm to 1.4mm, which further shortens the heat conduction path between the battery module and the first side plate, making the heat conduction path from the battery module to the first side plate smaller, thereby improving the heat dissipation capacity of the battery pack.

[0015] In some embodiments of the first aspect of the present application, there is a second gap between the second side plate and the battery module; the battery pack further includes a second heat conducting member, and the second heat conducting member is disposed in the second gap.

[0016] In the above technical solution, a second heat conductor is provided between the second side plate and the battery module, which is beneficial to improving the heat exchange efficiency between the battery module and the second side plate, thereby further improving the heat dissipation efficiency of the battery pack.

[0017] In some embodiments of the first aspect of the present application, along the first direction, the length of the second gap is 0.05 mm to 2.5 mm.

[0018] In the above technical solution, along the first direction, the length of the second gap is 0.05mm to 2.5mm, so the heat conduction path between the battery module and the second side plate is shorter, making the heat conduction path from the battery module to the second side plate smaller, thereby improving the heat dissipation capacity of the battery pack.

[0019] In some embodiments of the first aspect of the present application, along the first direction, the length of the second gap is 0.1 mm to 1.9 mm.

[0020] In the above technical solution, along the first direction, the length of the second gap is 0.1mm to 1.9mm, which further shortens the heat conduction path between the battery module and the second side plate, making the heat conduction path from the battery module to the second side plate smaller, thereby further improving the heat dissipation capacity of the battery pack.

[0021] In some embodiments of the first aspect of the present application, along the first direction, a length of the second gap is 0.1 mm to 1.4 mm.

[0022] In the above technical solution, along the first direction, the length of the second gap is 0.1mm to 1.4mm, which further shortens the heat conduction path between the battery module and the second side plate, making the heat conduction path from the battery module to the second side plate smaller, thereby improving the heat dissipation capacity of the battery pack.

[0023] In some embodiments of the first aspect of the present application, the bottom plate, the first side plate and the second side plate are integrally formed.

[0024] In the above technical solution, the bottom plate, the first side plate and the second side plate are integrally formed, so that the shell is easier to process and form.

[0025] In some embodiments of the first aspect of the present application, the inner surface of the first side plate is provided with a plurality of first protrusions, and the first protrusions extend between the sides of two adjacent battery cells; the inner surface of the second side plate is provided with a plurality of second protrusions, and the second protrusions extend between the sides of two adjacent battery cells.

[0026] In the above technical solution, a first protrusion is provided on the inner surface of the first side plate, extending between the sides of two adjacent battery cells. A second protrusion is provided on the inner surface of the second side plate, extending between the sides of two adjacent battery cells. The provision of the first and second protrusions increases the external heat dissipation area of ​​the U-shaped shell, increases the contact area between the U-shaped shell and the battery module, shortens the heat conduction path from the battery module to the first and second side plates of the shell, and thus improves the heat dissipation capacity of the battery pack. Heat can be conducted between the first side plate and the battery module through the first protrusion, which can also reduce the amount of the first heat conductor. Heat can be conducted between the second side plate and the battery module through the second protrusion, which can also reduce the amount of the second heat conductor.

[0027] In some embodiments of the first aspect of the present application, the first side panel is provided with a first side panel opening, the first side panel opening penetrates the first side panel along the first direction, the shell further includes a first heat dissipation fin, the first heat dissipation fin covers the first side panel opening and is connected to the first side panel; the second side panel is provided with a second side panel opening, the second side panel opening penetrates the second side panel along the first direction, the shell further includes a second heat dissipation fin, the second heat dissipation fin covers the second side panel opening and is connected to the second side panel.

[0028] In the above technical solution, the first side panel is provided with a first side panel opening, the first heat dissipation fin is connected to the first side panel and covers the first side panel opening, the second side panel is provided with a second side panel opening, the second heat dissipation fin is connected to the first side panel and covers the second side panel opening, and the battery module can dissipate heat through the first heat dissipation fin and the second heat dissipation fin, thereby further improving the heat dissipation efficiency.

[0029] In some embodiments of the first aspect of the present application, a first reinforcement and a second reinforcement are provided at two ends of the shell in the second direction.

[0030] In the above technical solution, the arrangement of the first reinforcement and the second reinforcement can increase the strength and thickness of the end area of ​​the shell in the second direction, and can also increase the connection area and sealing area between the first end plate and one end of the shell along the second direction, as well as increase the connection area and sealing area between the second end plate and the other end of the shell along the second direction, thereby improving the connection strength and sealing performance.

[0031] In some embodiments of the first aspect of the present application, the first reinforcement is U-shaped, the first reinforcement is fixedly connected to the outer surface of the shell, the first reinforcement and the first end plate are fixedly connected, and the first reinforcement and the second end plate are fixedly connected; the second reinforcement is U-shaped, the second reinforcement is fixedly connected to the outer surface of the shell, the second reinforcement and the first end plate are fixedly connected, and the second reinforcement and the second end plate are fixedly connected.

[0032] In the above technical solution, the first reinforcement is U-shaped, the second reinforcement is U-shaped, and both the first reinforcement and the second reinforcement match the shape of the shell. After the first reinforcement and the second reinforcement are fixedly connected to the outer surface of the shell, the strength of the shell can be better enhanced.

[0033] In some embodiments of the first aspect of the present application, the first reinforcement is provided with a first clip groove, the first end plate includes a first end plate body and a first clip portion, the first clip portion is provided at the edge of the first end plate body, and the first clip portion is clipped into the first clip groove; the second reinforcement is provided with a second clip groove, the second end plate includes a second end plate body and a second clip portion, the second clip portion is provided at the edge of the second end plate body, and the second clip portion is clipped into the second clip groove.

[0034] In the above technical solution, the first engaging portion of the first end plate engages with the first engaging groove of the first reinforcement member, thereby accurately positioning the first end plate and the housing, thereby facilitating a stable connection between the first end plate and the housing. The second engaging portion of the second end plate engages with the second engaging groove of the second reinforcement member, thereby accurately positioning the second end plate and the housing, thereby facilitating a stable connection between the second end plate and the housing.

[0035] In some embodiments of the first aspect of the present application, the first clamping portion includes a first limiting plate and a first protrusion, the first limiting plate is connected to the first end plate body, and is located on the side of the first reinforcement away from the battery module along the first direction, and the first protrusion is protruding from the surface of the first limiting plate facing the first reinforcement, and is clamped in the first clamping groove; the second clamping portion includes a second limiting plate and a second protrusion, the second limiting plate is connected to the second end plate body, and is located on the side of the second reinforcement away from the battery module along the first direction, and the second protrusion is protruding from the surface of the second limiting plate facing the second reinforcement, and is clamped in the second clamping groove.

[0036] In the above technical solution, the first limiting plate is connected to the edge of the first end plate body and is located on the side of the first reinforcement member away from the battery module along the first direction, and can limit the relative movement of the shell and the first end plate in the first direction. The first protrusion is protruding from the surface of the first limiting plate facing the first reinforcement member and is clamped in the first card slot, and can limit the first end plate from separating from the shell, thereby improving the relative stability of the first end plate and the shell. The second limiting plate is connected to the edge of the second end plate body and is located on the side of the second reinforcement member away from the battery module along the first direction, and can limit the relative movement of the shell and the second end plate in the first direction. The second protrusion is protruding from the surface of the second limiting plate facing the second reinforcement member and is clamped in the second card slot, and can limit the second end plate from separating from the shell, thereby improving the relative stability of the second end plate and the shell.

[0037] In some embodiments of the first aspect of the present application, a first seal is provided between one end of the shell in the second direction and the first end plate; a second seal is provided between the other end of the shell in the second direction and the second end plate.

[0038] In the above technical solution, the provision of the first seal and the second seal can improve the sealing performance of the battery pack, reduce the risk of impurities from the external environment entering the battery pack, and help extend the service life of the battery pack and improve the safety performance of the battery pack.

[0039] In some embodiments of the first aspect of the present application, a first groove is formed on the surface of the first end plate facing the shell, the first groove is arranged along the edge of the first end plate, and the first seal is arranged in the first groove; a second groove is formed on the surface of the second end plate facing the shell, the second groove is arranged along the edge of the second end plate, and the second seal is arranged in the second groove.

[0040] In the above technical solution, the first seal is arranged in the first groove, and the second seal is arranged in the second groove. The first seal is embedded in the first end plate, and the second seal is embedded in the second end plate. The first seal and the first end plate share a part of the space, and the second seal and the second end plate share a part of the space, which is conducive to reducing the volume of the battery pack, thereby facilitating the miniaturization of the battery pack structure.

[0041] In some embodiments of the first aspect of the present application, the battery cell includes an electrode assembly, a packaging bag and a tab connected to the electrode assembly, the packaging bag has a sealing portion, the tab extends out of the packaging bag from the sealing portion, and there is a first space between the sealing portions of two adjacent battery cells; the first side plate is provided with a first through hole, the first through hole passes through the first side plate along the first direction, and the first through hole is connected to part of the first space; the battery pack also includes a first colloid, which is at least partially provided in the first space, and the first through hole is configured to provide a first insulating material in the first space to form a first colloid.

[0042] In the above technical solution, when viewed along the first direction, both the first through hole and the second through hole overlap with the space between the sealed portions of two adjacent battery cells. The first colloid is injected into the casing through the first through hole and / or the second through hole. The first colloid can fill the space between the sealed portions of two adjacent battery cells. The first colloid can improve the thermal conductivity between the battery cells and the casing. The second through hole also facilitates ventilation and heat dissipation of the battery pack, thereby improving the heat dissipation capacity of the battery pack. The first colloid is filled in the space between the sealed portions of two adjacent battery cells, which helps alleviate the deformation problem of the two adjacent battery cells. Injecting the first colloid into the casing also helps improve the airtightness of the battery pack.

[0043] In some embodiments of the first aspect of the present application, the battery module further includes a first circuit board, the tab is electrically connected to the first circuit board, the first circuit board and the packaging bag are arranged along the second direction, and a portion of the first colloid is connected to the first circuit board.

[0044] In the above technical solution, the tab is electrically connected to the first circuit board, enabling multiple battery cells to be electrically connected via the first circuit board, facilitating the output of power from each cell or charging the battery module. The first circuit board and the packaging bag are arranged along the second direction, and the first colloid is partially connected to the first circuit board, reducing the risk of interference between the first circuit board and other structures of the battery pack.

[0045] In some embodiments of the first aspect of the present application, the battery pack further includes a cover, which covers the first opening of the box; the battery pack further includes a second circuit board, which is located on a side of the battery module away from the bottom plate.

[0046] In the above technical solution, the cover seals the first opening of the box, providing better protection for the structure within the box, facilitating its normal operation, and reducing the risk of damage to the structure, thereby extending the service life of the structure within the box. The second circuit board is located on the side of the battery module facing away from the bottom plate, i.e., it is positioned near the first opening of the box, facilitating its installation.

[0047] In some embodiments of the first aspect of the present application, the battery pack further includes a bracket, the bracket being located between the box body and the cover body, the box body and the cover body being respectively connected to the bracket, and the second circuit board being located between the bracket and the cover body.

[0048] In the above technical solution, the bracket is located between the box body and the cover body, and the second circuit board is located between the bracket and the cover body, which is convenient for installing and fixing the second circuit board. The bracket can also act as a partition between the second circuit board and the battery module, reducing the risk of interference between the second circuit board and the battery module.

[0049] In some embodiments of the first aspect of the present application, the battery module is located between the bracket and the bottom plate, and the bracket is connected to the battery module.

[0050] In the above technical solution, the bracket is connected to the battery module, which is conducive to the bracket and the bottom plate of the shell jointly limiting the battery module, alleviating the problem of battery module movement, and improving the safety performance of the battery pack.

[0051] In some embodiments of the first aspect of the present application, the bracket is provided with a third through hole, and the third through hole is configured to inject a second insulating material into the box to form a second colloid.

[0052] In the above technical solution, a second insulating material is injected into the casing through the third through-hole to form a second colloid. This second colloid can fill any accessible gaps within the casing, thereby improving the casing's airtightness. The second colloid also enhances thermal conductivity between the battery module and the casing, thereby improving the battery pack's heat dissipation capabilities. Filling the casing with the second colloid helps alleviate the problem of battery module movement, thereby improving the battery pack's safety.

[0053] In some embodiments of the first aspect of the present application, the bracket is provided with two third through holes, and the two third through holes are arranged at intervals along the second direction; when viewed along the third direction, the space between the first end plate and the battery module overlaps with one of the two third through holes, and the space between the second end plate and the battery module overlaps with the other of the two third through holes.

[0054] In the above technical solution, when observed along the third direction, the space between the first end plate and the battery module overlaps with a third through hole, and the space between the second end plate and the battery module overlaps with another third through hole. Glue can be poured into the space between the first end plate and the battery module and the space between the second end plate and the battery module through the corresponding third through holes, which can improve the efficiency of glue pouring and is conducive to the uniform distribution of the second colloid in the box.

[0055] In some embodiments of the first aspect of the present application, a third sealing member is provided between the bracket and one end of the box forming the first opening.

[0056] In the above technical solution, a third sealing member is provided between the end of the box body forming the first opening and the bracket, which is beneficial to improving the airtightness of the battery pack, thereby improving the safety performance of the battery pack and extending the service life of the battery pack.

[0057] In some embodiments of the first aspect of the present application, a third groove is provided on the side of the bracket facing the box body, the third groove extends along the circumference of the opening, one end of the box body forming the opening is inserted into the third groove, and the third sealing member is accommodated in the third groove.

[0058] In the above technical solution, a third groove is provided on the side of the bracket facing the case. The end of the case forming the first opening is inserted into the third groove, allowing the case and bracket to be accurately positioned relative to each other. The bracket and case also overlap in the direction of the third groove, sharing a portion of space. This reduces the size of the battery pack and facilitates structural miniaturization. The third seal is accommodated in the third groove, facilitating its stable installation.

[0059] In some embodiments of the first aspect of the present application, a fourth sealing member is provided between the cover and the bracket.

[0060] In the above technical solution, a fourth sealing member is provided between the cover and the bracket, which is beneficial to improving the airtightness of the battery pack, thereby improving the safety performance of the battery pack and extending the service life of the battery pack.

[0061] In some embodiments of the first aspect of the present application, a fourth groove is provided on a side of the cover body facing the bracket, the fourth groove extends along the circumference of the first opening, and at least a portion of the fourth seal is accommodated in the fourth groove.

[0062] In the above technical solution, a fourth groove is provided on the side of the cover body facing the bracket, and at least a portion of the fourth seal is accommodated in the fourth groove. The fourth seal and the cover body share a part of the space, which is beneficial to reducing the volume of the battery pack, thereby facilitating the miniaturization of the battery pack structure.

[0063] In some embodiments of the first aspect of the present application, part of the first colloid is located in the first through hole.

[0064] In some embodiments of the first aspect of the present application, the second side plate is provided with a second through hole, and the second through hole passes through the second side plate along the first direction, and the second through hole is connected to the first space.

[0065] In some embodiments of the first aspect of the present application, part of the first colloid is located in the second through hole.

[0066] In some embodiments of the first aspect of the present application, along the first direction, a projection of the first through hole and a projection of the second through hole overlap.

[0067] In some embodiments of the first aspect of the present application, the battery cell includes a packaging bag and a tab, the packaging bag has a sealing portion, the tab extends out of the packaging bag from the sealing portion, the multiple battery cells are stacked along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; a portion of the third heat conductor is arranged between two adjacent battery cells, and along the first direction, a portion of the third heat conductor extends to the space between the first side plate and the multiple battery cells, and a portion of the third heat conductor extends to the space between the second side plate and the multiple battery cells.

[0068] In the above technical solution, the provision of the third heat-conducting member is conducive to the rapid conduction of heat from the battery cell, thereby improving the heat dissipation capacity of the battery pack.

[0069] In some embodiments of the first aspect of the present application, along the first direction, a length of the first gap is 0.05 mm to 1.5 mm.

[0070] In the above technical solution, along the first direction, the length of the first gap is 0.02mm to 1.5mm, so the heat conduction path between the battery module and the first side plate is shorter, making the heat conduction path from the battery module to the first side plate smaller, thereby improving the heat dissipation capacity of the battery pack.

[0071] In some embodiments of the first aspect of the present application, along the first direction, a length of the first gap is 0.1 mm to 1.1 mm.

[0072] In the above technical solution, along the first direction, the length of the first gap is 0.1mm to 1.1mm, which further shortens the heat conduction path between the battery module and the first side plate, making the heat conduction path from the battery module to the first side plate smaller, thereby further improving the heat dissipation capacity of the battery pack.

[0073] In some embodiments of the first aspect of the present application, along the first direction, a length of the first gap is 0.1 mm to 0.6 mm.

[0074] In the above technical solution, along the first direction, the length of the first gap is 0.1mm to 0.6mm, which further shortens the heat conduction path between the battery module and the first side plate, making the heat conduction path from the battery module to the first side plate smaller, thereby improving the heat dissipation capacity of the battery pack.

[0075] In some embodiments of the first aspect of the present application, a second gap exists between the second side plate and the battery module, and a length of the first gap is 0.05 mm to 1.5 mm along the first direction.

[0076] In the above technical solution, along the first direction, the length of the second gap is 0.05mm to 1.5mm, so the heat conduction path between the battery module and the second side plate is shorter, making the heat conduction path from the battery module to the second side plate smaller, thereby improving the heat dissipation capacity of the battery pack.

[0077] In some embodiments of the first aspect of the present application, along the first direction, a length of the second gap is 0.1 mm to 1.1 mm.

[0078] In the above technical solution, along the first direction, the length of the second gap is 0.1mm to 1.1mm, which further shortens the heat conduction path between the battery module and the second side plate, making the heat conduction path from the battery module to the second side plate smaller, thereby further improving the heat dissipation capacity of the battery pack.

[0079] In some embodiments of the first aspect of the present application, along the first direction, a length of the second gap is 0.1 mm to 0.6 mm.

[0080] In the above technical solution, along the first direction, the length of the second gap is 0.1mm to 0.6mm, which further shortens the heat conduction path between the battery module and the second side plate, making the heat conduction path from the battery module to the second side plate smaller, thereby improving the heat dissipation capacity of the battery pack.

[0081] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery pack provided in any embodiment of the first aspect.

[0082] In the above technical solution, the battery pack in the first embodiment has good heat dissipation capability to meet the high-rate, non-static, and continuous charging and discharging power conditions of the electrical equipment, and is also beneficial to improving the power safety of the electrical equipment equipped with the battery pack.

[0083] In a third aspect, an embodiment of the present application provides a method for manufacturing a battery pack, comprising:

[0084] Providing a housing, wherein the housing is U-shaped and includes a first side plate and a second side plate arranged opposite to each other, and a bottom plate connecting the first side plate and the second side plate;

[0085] Applying an external force to the housing to deform the first side plate and the second side plate in directions away from each other;

[0086] Providing a battery module and a first heat conducting member, and disposing the first heat conducting member on the first side plate or the battery module;

[0087] Place the battery module between the first side plate and the second side plate, which are spaced apart from each other, in a direction perpendicular to the bottom plate;

[0088] Remove the external force to restore the first side plate and the second side plate.

[0089] In the above technical solution, external force is applied to the shell to deform the first side plate and the second side plate in directions away from each other, so that a larger entrance is formed at the end of the shell away from the bottom plate, providing space for the clamp to clamp the battery module into the shell, and the external force is removed to reset the first side plate and the second side plate. There is no space for the clamp to be inserted between the first side plate and the battery module and between the second side plate and the battery module, so that the distance between the first side plate and the battery module and the distance between the second side plate and the battery module can be very small, which can shorten the heat conduction path between the battery module and the first side plate of the shell and between the battery module and the second side plate, thereby improving the heat dissipation capacity of the battery pack.

[0090] In some embodiments of the third aspect of the present application, after the external force is removed, the method for manufacturing the battery pack further includes:

[0091] Providing two end plates, connecting the two end plates to both ends of the first side plate and the second side plate, so that the shell and the two end plates form a box body having a first opening, wherein the opening is opposite to the bottom plate;

[0092] A cover is provided to cover the first opening.

[0093] In the above technical solution, after the external force is removed, the two end plates are connected to the two ends of the first side plate and the second side plate, and the cover is used to seal the first opening of the box body, which is beneficial to improving the airtightness of the battery pack.

[0094] An embodiment of the present application provides another battery pack, which includes a shell, a first end plate, a second end plate, a battery module, a first reinforcement and a second reinforcement; the shell is U-shaped, and the shell includes a bottom plate, a first side plate and a second side plate, and the first side plate and the second side plate are arranged opposite to each other along a first direction; the first end plate and the second end plate are arranged opposite to each other along a second direction, and the first end plate, the second end plate and the shell form a box body with a first opening, and the first opening is opposite to the bottom plate; the battery module is accommodated in the box body; the first reinforcement is U-shaped, and the first reinforcement is fixedly connected to the outer surface of the shell, and the first reinforcement, the first side plate and the first end plate are sealed together; the second reinforcement is U-shaped, and the second reinforcement is fixedly connected to the outer surface of the shell, and the second reinforcement, the second side plate and the second end plate are sealed together.

[0095] In some embodiments, the battery pack further includes a first seal, the first end plate is provided with a first groove, at least a portion of the first seal is located in the first groove, and portions of the first reinforcement and the first side plate are provided in the first groove.

[0096] In some embodiments, the battery pack further includes a second seal, the second end plate is provided with a second groove, at least a portion of the second seal is located in the second groove, and portions of the second reinforcement and the second side plate are provided in the first groove.

[0097] In some embodiments, the first reinforcement member is provided with a first card slot, the first end plate includes a first end plate body and a first card portion, the first card portion is provided at an edge of the first end plate body, and the first card portion is carded in the first card slot.

[0098] In some embodiments, there is an angle between the extension direction of the first slot and the second direction.

[0099] In some embodiments, the first clamping portion includes a first limiting plate and a first protrusion, the first limiting plate is connected to the edge of the first end plate body and is located on the side of the first reinforcement away from the battery module along the first direction, and the first protrusion is protruding from the surface of the first limiting plate facing the first reinforcement and is clamped in the first clamping slot.

[0100] In some embodiments, a plurality of first fixing holes are provided on the first end plate, a second fixing hole is provided on the first side plate and / or the first reinforcement, a third fixing hole is provided on the second side plate and / or the first reinforcement, and the second fixing holes and the third fixing holes are respectively connected to the plurality of first fixing holes through a first connecting member.

[0101] In some embodiments, along the third direction, the second fixing hole and the third fixing hole are closer to the first opening than to the first slot.

[0102] In some embodiments, the second reinforcement is provided with a second card slot, the second end plate includes a second end plate body and a second card connection portion, the second card connection portion is provided at the edge of the second end plate body, and the second card connection portion is carded in the second card slot.

[0103] In some embodiments, there is an angle between the extension direction of the second slot and the second direction.

[0104] In some embodiments, the second clamping portion includes a second limiting plate and a second protrusion, the second limiting plate is connected to the edge of the second end plate body and is located on the side of the second reinforcement member away from the battery module along the first direction, and the second protrusion is protruding from the surface of the second limiting plate facing the second reinforcement member and is clamped in the second clamping slot.

[0105] In some embodiments, a plurality of fourth fixing holes are provided on the second end plate, a fifth fixing hole is provided on the first side plate and / or the second reinforcement, and a sixth fixing hole is provided on the second side plate and / or the second reinforcement, and the fifth fixing hole and the sixth fixing hole are respectively connected to the plurality of fourth fixing holes through a second connecting member.

[0106] In some embodiments, along the third direction, the fifth fixing hole and the sixth fixing hole are closer to the first opening relative to the second slot.

[0107] In some embodiments, along the first direction, the thickness of the first side panel ranges from 0.5 mm to 1.8 mm, and the thickness of the second side panel ranges from 0.5 mm to 1.8 mm.

[0108] In some embodiments, the battery module is located between the first side plate and the second side plate, the battery module includes multiple battery cells, and along the first direction, there is a first gap between the first side plate and the battery module; the battery pack also includes a first heat conductor, which is arranged in the first gap, and the battery module and the first side plate are connected through the first heat conductor; the first side plate and the second side plate are configured to move away from each other under the action of external force so as to place the battery module in the shell.

[0109] In some embodiments, along the first direction, a length of the first gap is 0.05 mm to 2.5 mm.

[0110] In some embodiments, along the first direction, there is a second gap between the second side plate and the battery module; the battery pack further includes a second heat conducting member, and the second heat conducting member is disposed in the second gap.

[0111] In some embodiments, along the first direction, a length of the second gap is 0.05 mm to 2.5 mm.

[0112] In some embodiments, the battery pack further includes a cover body, which covers the first opening; the first end plate is provided with a seventh fixing hole, the second end plate is provided with an eighth fixing hole, and the cover body is provided with a plurality of ninth fixing holes, a portion of the plurality of ninth fixing holes is connected to the seventh fixing hole through a third connecting member, and another portion of the plurality of ninth fixing holes is connected to the eighth fixing hole through a fourth connecting member.

[0113] In some embodiments, the first end plate includes a first end plate body, a first connecting protrusion and a second connecting protrusion, the first connecting protrusion and the second connecting protrusion are both connected to the edge of the first end plate body and are arranged at intervals along the first direction, and the first connecting protrusion and the second connecting protrusion both protrude in a direction away from the battery module; the first connecting protrusion is provided with the seventh fixing hole, the second connecting protrusion is provided with the seventh fixing hole, the first connecting protrusion is also provided with a first fixing hole for connecting to the first reinforcement and / or the first side plate, and the second connecting protrusion is also provided with the first fixing hole for connecting to the first reinforcement and / or the second side plate.

[0114] In some embodiments, the second end plate includes a second end plate body, a third connecting protrusion and a fourth connecting protrusion, the third connecting protrusion and the fourth connecting protrusion are both connected to the edge of the second end plate body and are arranged at intervals along the first direction, and the third connecting protrusion and the fourth connecting protrusion both protrude in a direction away from the battery module; the third connecting protrusion is provided with the eighth fixing hole, the fourth connecting protrusion is provided with the eighth fixing hole, the third connecting protrusion is also provided with a fourth fixing hole for connecting to the second reinforcement and / or the first side plate, and the fourth connecting protrusion is also provided with the fourth fixing hole for connecting to the second reinforcement and / or the second side plate.

[0115] An embodiment of the present application provides another battery pack, which includes a shell, a battery module and a first colloid; the shell includes a bottom plate, a first side plate and a second side plate, the first side plate and the second side plate are arranged opposite to each other along a first direction, and the bottom plate connects the first side plate and the second side plate; the battery module is located between the first side plate and the second side plate, the battery module includes a plurality of battery cells arranged along a third direction, each of the battery cells includes an electrode assembly, a packaging bag and a tab connected to the electrode assembly, the packaging bag has a sealing portion, the tab extends out of the packaging bag from the sealing portion, and a first space is provided between the sealing portions of two adjacent battery cells; the first side plate is provided with a first through hole, the first through hole passes through the first side plate along the first direction, and the first through hole is connected to part of the first space; the first colloid is at least partially provided in the first space, and the first through hole is configured to provide a first insulating material in the first space to form the first colloid.

[0116] In some embodiments, a portion of the first colloid is located in the first through hole.

[0117] In some embodiments, the second side plate is provided with a second through hole, and the second through hole passes through the second side plate along the first direction, and the second through hole is connected to a portion of the first space.

[0118] In some embodiments, a portion of the first colloid is located in the second through hole.

[0119] In some embodiments, along the first direction, a projection of the first through hole and a projection of the second through hole overlap.

[0120] In some embodiments, the battery module further includes a first circuit board, the tab is connected to the first circuit board, the first circuit board and the packaging bag are arranged along a second direction, the first direction, the second direction and the third direction are perpendicular to each other; a portion of the first colloid is connected to the first circuit board.

[0121] In some embodiments, the battery pack further includes a bracket, the bracket and the battery module are arranged along a third direction, and the bracket is provided with a third through hole; the battery pack further includes a first end plate, a second end plate and a second colloid, the first end plate, the second end plate and the shell form a box body, the second colloid is provided in the gap between the first end plate and the first circuit board, and the third through hole is configured for a third insulating material to be injected into the box body to form the third colloid.

[0122] In some embodiments, along the third direction, a projection of the third through hole and a projection of the electrode assembly are staggered.

[0123] In some embodiments, the bracket is configured to apply pressure to the battery module.

[0124] In some embodiments, the battery pack further includes a second circuit board and a connecting component, and the battery module and the second circuit board are arranged along the third direction; the connecting component connects the first circuit board and the second circuit board, and the connecting component is configured to transmit electrical signals and electrical energy of the battery module.

[0125] In some embodiments, there is a first gap between the first side plate and the battery module along the first direction; the battery pack also includes a first heat conductor, which is arranged in the first gap, and the battery module and the first side plate are connected through the first heat conductor; the first side plate and the second side plate are configured to move away from each other under the action of external force so as to place the battery module in the shell.

[0126] In some embodiments, along the first direction, the length of the first gap is 0.05 mm to 2.5 mm.

[0127] In some embodiments, along the first direction, a length of the first gap is 0.1 mm to 1.9 mm.

[0128] In some embodiments, along the first direction, a length of the first gap is 0.1 mm to 1.4 mm.

[0129] In some embodiments, there is a second gap between the second side plate and the battery module; the battery pack further includes a second heat conductor, which is disposed in the second gap; along the first direction, a length of the second gap is 0.05 mm to 2.5 mm.

[0130] In some embodiments, along the first direction, a length of the second gap is 0.1 mm to 1.9 mm.

[0131] In some embodiments, along the first direction, a length of the second gap is 0.1 mm to 1.4 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0132] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope.

[0133] FIG1 is a schematic structural diagram of a battery pack provided in some embodiments of the present application;

[0134] FIG2 is an exploded view of a battery pack provided in some embodiments of the present application;

[0135] FIG3 is a schematic diagram of a battery module provided in some embodiments of the present application;

[0136] FIG4 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0137] FIG5 is a schematic structural diagram of a battery module provided in some other embodiments of the present application;

[0138] FIG6 is a view of the battery module in FIG5 along a first direction;

[0139] FIG7 is a schematic structural diagram of a third heat conducting member provided in some embodiments of the present application;

[0140] FIG8 is a schematic diagram of a battery module without a third heat conducting member and accommodated in a housing according to some embodiments of the present application (without the first heat conducting member and the second heat conducting member);

[0141] FIG9 is an enlarged view of point B1 in FIG8 ;

[0142] FIG10 is a schematic diagram of a first heat conducting member provided in the first gap and a second heat conducting member provided in the second gap in FIG8 ;

[0143] FIG11 is an enlarged view of point B2 in FIG10 ;

[0144] FIG12 is a schematic diagram of a battery module provided with a third heat conducting member and accommodated in a housing according to other embodiments of the present application (the first heat conducting member and the second heat conducting member are not provided);

[0145] FIG13 is an enlarged view of point B3 in FIG12 ;

[0146] FIG14 is a schematic diagram of a first heat conducting member provided in the first gap and a second heat conducting member provided in the second gap in FIG12;

[0147] FIG15 is an enlarged view of point B4 in FIG14 ;

[0148] FIG16 is an enlarged view of point C1 in FIG8 ;

[0149] FIG17 is an enlarged view of point C2 in FIG10 ;

[0150] FIG18 is an enlarged view of point C3 in FIG12 ;

[0151] FIG19 is an enlarged view of point C4 in FIG14 ;

[0152] FIG20 is a schematic diagram of an exploded shell, a first reinforcement, and a second reinforcement provided by some embodiments of the present application;

[0153] FIG21 is a schematic diagram of the assembled shell, the first reinforcement and the second reinforcement in FIG20 ;

[0154] FIG22 is a schematic diagram of a housing and an end plate provided in some embodiments of the present application when not connected (exploded view of the housing);

[0155] FIG23 is a schematic diagram of the assembled housing, the first reinforcement, and the second reinforcement provided by some embodiments of the present application;

[0156] FIG24 is a view of the assembled housing, the first reinforcement, and the second reinforcement according to some embodiments of the present application, as viewed from the second opening;

[0157] FIG25 is an enlarged view of point D1 in FIG23;

[0158] FIG26 is an enlarged view of point D2 in FIG23;

[0159] FIG27 is a schematic structural diagram of a first end plate provided in some embodiments of the present application;

[0160] FIG28 is an enlarged view of point E1 in FIG27 ;

[0161] FIG29 is an enlarged view of point E2 in FIG27 ;

[0162] FIG30 is a schematic structural diagram of a cover provided in some embodiments of the present application;

[0163] FIG31 is an enlarged view of point B5 in FIG8 ;

[0164] Figure 32 is an enlarged view of point B6 in Figure 8;

[0165] FIG33 is a view of a housing provided by some embodiments of the present application along a first direction;

[0166] FIG34 is an axonometric view of a housing provided in some embodiments of the present application;

[0167] FIG35 is a cross-sectional view of a battery pack provided in some embodiments of the present application;

[0168] FIG36 is an enlarged view of point F1 in FIG35 ;

[0169] FIG37 is a schematic diagram of an unassembled housing, a first heat dissipating fin, and a second heat dissipating fin provided in some other embodiments of the present application;

[0170] FIG38 is a schematic diagram of an assembled housing, a first heat dissipating fin, and a second heat dissipating fin according to some embodiments of the present application;

[0171] FIG39 is an exploded view of a battery pack provided in some other embodiments of the present application;

[0172] FIG40 is a schematic structural diagram of the bracket in FIG2 ;

[0173] FIG41 is a schematic diagram of the bracket in FIG2 from another perspective;

[0174] FIG42 is a view of a bracket provided by some embodiments of the present application along a third direction;

[0175] FIG43 is a view of a bracket provided by some embodiments of the present application along a first direction;

[0176] FIG44 is a view of a battery module provided along a first direction according to some further embodiments of the present application;

[0177] FIG45 is an enlarged view of G1 in FIG41;

[0178] FIG46 is a schematic diagram of a battery pack along a second direction provided by some embodiments of the present application;

[0179] FIG47 is a cross-sectional view of FIG46 taken along the PP direction;

[0180] FIG48 is an enlarged view of J1 in FIG47;

[0181] FIG49 is an enlarged view of J2 in FIG47;

[0182] FIG50 is an enlarged view of K1 in FIG30 ;

[0183] FIG51 is a flow chart of a method for manufacturing a battery pack according to some embodiments of the present application;

[0184] FIG52 is a comparison diagram before and after external force is applied to the shell.

[0185] Icons: 100-battery pack; 10-housing; 11-bottom plate; 12-first side plate; 121-inner surface of the first side plate; 122-outer surface of the first side plate; 123-second threaded hole; 124-fifth threaded hole; 125-first protrusion; 1251-first arc surface; 126-first recessed portion; 127-first through hole; 128-first side plate opening; 129-thirteenth threaded hole; 13-second side plate; 131-inner surface of the second side plate; 132-outer surface of the second side plate; 133-third threaded hole; 134-sixth threaded hole; 135-second protrusion; 1351-second arc surface; 136-second recessed portion; 137-second through hole; 138-second side plate opening; 139-thirteenth threaded hole Four threaded holes; 14-second opening; 15-third opening; 16-fourth opening; 20-battery module; 21-battery cell; 22-first buffer; 23-packaging bag; 231-sealing part; 2310-first space; 2311-first sealing part; 2312-second sealing part; 2313-third sealing part; 232-packaging body; 25-tab; 24a-positive tab; 24b-negative tab; 26-first circuit board; 261-total positive electrode; 262-total negative electrode; 27-third heat conducting member; 271-bottom wall; 272-side wall; 2721-first side wall; 2722-second side wall; 2723-third side wall; 273-notch; 274-fifth opening; 28-second buffer; 30-first conductor Heater; 50-second heat conducting member; 60-first reinforcement; 61-first reinforcement portion; 62-second reinforcement portion; 63-third reinforcement portion; 64-first slot; 70-second reinforcement; 71-fourth reinforcement portion; 72-fifth reinforcement portion; 73-sixth reinforcement portion; 74-second slot; 80-first end plate; 81-first threaded hole; 82-first end plate body; 83-first clamping portion; 831-first limiting plate; 832-first protrusion; 84-first wing; 85-first groove; 86-seventh threaded hole; 90-second end plate; 91-fourth threaded hole; 92-second end plate body; 93-second clamping portion; 931-second limiting plate; 932-second protrusion; 94-second wing; 96-eighth threaded hole Hole; 110 - cover; 1101 - ninth threaded hole; 1102 - fourth groove; 120 - second circuit board; 130 - first heat sink; 1301 - first heat sink portion; 140 - second heat sink; 1401 - second heat sink portion; 150 - bracket; 1501 - tenth threaded hole; 1502 - first surface; 1503 - second surface; 1504 - protrusion; 1505 - accommodation portion; 1506 - reinforcing rib; 1507 - connecting column; 15071 - eleventh threaded hole; 1508 - twelfth threaded hole; 1509 - third groove; 1510 - limiting portion; 1511 - third through hole; A1 - first gap; A2 - second gap; Q - box; Q1 - first opening; D1 - first colloid;D2 - second colloid; W1 - first seal; W2 - second seal; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0186] In order to make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0187] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the present application.

[0188] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0189] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0190] In the description of the embodiments of the present application, it should be noted that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are merely for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present application. In addition, the terms "first," "second," "third," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0191] Currently, judging by market developments, battery packs are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in power tools, drones, and energy storage devices. As the application areas of battery packs continue to expand, market demand is also growing.

[0192] The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, whether the battery can charge and discharge normally as environmental conditions and / or internal battery conditions change is also one of the key considerations.

[0193] The inventors discovered that the temperature inside a battery pack fluctuates significantly during charge and discharge. This can lead to excessively high cell temperatures when the battery is used at high rates, without rest, and in continuous charge and discharge conditions (such as in agricultural drone batteries). To ensure normal charge and discharge, the cell temperature must be quickly lowered.

[0194] Based on the above considerations, in order to improve the heat dissipation capacity of the battery pack, an embodiment of the present application provides a battery pack, which includes a shell, a battery module and a first heat conductor; the shell is U-shaped, and the shell includes a bottom plate, a first side plate and a second side plate, the first side plate and the second side plate are arranged opposite to each other along a first direction, and the bottom plate connects the first side plate and the second side plate; the battery module is located between the first side plate and the second side plate, the battery module includes a plurality of battery cells, and there is a first gap between the first side plate and the battery module; the first heat conductor is arranged in the first gap, and the battery module and the first side plate are connected by the first heat conductor; the first side plate and the second side plate are configured to move away from each other under the action of external force so as to place the battery module in the shell.

[0195] During the process of assembling the battery pack, the first side plate and the second side plate move away from each other under the action of external force, and the distance between the first side plate and the second side plate gradually increases in the direction away from the bottom plate, so that a larger entrance is formed at the end of the shell away from the bottom plate, providing space for the battery module to enter the shell, facilitating the battery module to enter the shell. After the external force is removed, the first side plate and the second side plate can be reset in the direction of approaching each other, and along the first direction, the gap between the first side plate and the battery module and the gap between the second side plate and the battery module are both smaller, which can shorten the heat conduction path between the battery module and the first side plate of the shell and between the battery module and the second side plate, thereby improving the heat dissipation capacity of the battery pack.

[0196] Providing a first heat conducting member between the first side plate and the battery module is beneficial to improving the heat exchange efficiency between the battery module and the first side plate, thereby further improving the heat dissipation efficiency of the battery pack.

[0197] The battery pack disclosed in the embodiments of this application can be used, but is not limited to, in electrical devices such as electric two-wheeled vehicles, power tools, drones, and energy storage devices. A battery pack equipped with the working conditions provided in this application can also be used as a power supply system for electrical devices, which helps improve the heat dissipation capacity of the power supply system during the charging and discharging process and the power safety of the electrical devices.

[0198] The present invention provides an electrical device that uses a battery pack as a power source. The electrical device may include, but is not limited to, electronic devices, power tools, electric vehicles, drones, and energy storage devices. Electronic devices may include mobile phones, tablets, and laptops; power tools may include electric drills and electric saws; and electric vehicles may include electric cars, electric motorcycles, and electric bicycles.

[0199] As shown in Figures 1 and 2, a battery pack 100 includes a housing 10, a battery module 20, and a first heat conducting member 30. The housing 10 is U-shaped and includes a bottom plate 11, a first side plate 12, and a second side plate 13. The first side plate 12 and the second side plate 13 are arranged opposite each other along a first direction X, and the bottom plate 11 connects the first side plate 12 and the second side plate 13. The battery module 20 is located between the first side plate 12 and the second side plate 13 and includes a plurality of battery cells 21. A first gap A1 exists between the first side plate 12 and the battery module 20 along the first direction X. The first heat conducting member 30 is disposed in the first gap A1, connecting the battery module 20 and the first side plate 12 via the first heat conducting member 30. The first side plate 12 and the second side plate 13 are configured to move away from each other under the action of an external force, thereby positioning the battery module 20 within the housing 10. Optionally, the external force may be applied directly manually or with the assistance of an external force.

[0200] During the process of assembling the battery pack 100, the first side plate 12 and the second side plate 13 move away from each other under the action of external force, and the distance between the first side plate 12 and the second side plate 13 gradually increases in the direction away from the bottom plate 11, so that the shell 10 forms a larger entrance at the end away from the bottom plate 11, providing more space for the battery module 20 to enter the shell 10, facilitating the battery module 20 to enter the shell 10. After the external force is removed, the first side plate 12 and the second side plate 13 are reset in the direction of approaching each other in the first direction X, and along the first direction X, the gap between the first side plate 12 and the battery module 20 and the gap between the second side plate 13 and the battery module 20 are both smaller, which can shorten the heat conduction path between the battery module 20 and the first side plate 12 of the shell 10 and between the battery module 20 and the second side plate 13, thereby improving the heat dissipation capacity of the battery pack 100. Disposing the first heat conductor 30 between the first side plate 12 and the battery module 20 is beneficial to improving the heat exchange efficiency between the battery module 20 and the first side plate 12 , thereby further improving the heat dissipation efficiency of the battery pack 100 .

[0201] The bottom plate 11 is connected to the first side plate 12 and the second side plate 13 at both ends along the first direction X, and the bottom plate 11, the first side plate 12 and the second side plate 13 together form a U-shaped shell 10. A second opening 14 and a third opening 15 are formed at the opposite ends of the shell 10 along the second direction Y, respectively. A fourth opening 16 is formed at the end of the shell 10 facing away from the bottom plate 11. The fourth opening 16 and the bottom plate 11 are arranged relative to each other along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The battery module 20 can enter the shell 10 from the fourth opening 16. When an external force P is applied to the first side plate 12 and the second side plate 13, the fourth opening 16 is enlarged along the first direction X, making it easier for the battery module 20 to enter the shell 10 from the fourth opening 16.

[0202] The shell 10 can be made of a variety of materials, such as steel, copper, aluminum, etc., which is not limited in this application.

[0203] As shown in Figure 3, the battery module 20 includes a plurality of battery cells 21 arranged in a stacked manner, where "a plurality" refers to two or more. The plurality of battery cells 21 can be stacked in any direction, for example, the stacking direction of the plurality of battery cells 21 is perpendicular to the direction in which the first side plate 12 and the second side plate 13 of the shell 10 are arranged relative to each other, for example, the plurality of battery cells 21 are stacked along the second direction Y or the plurality of battery cells 21 are stacked along the third direction Z. As shown in Figure 3, in this embodiment, the plurality of battery cells 21 are stacked along the third direction Z to facilitate the battery module 20 to enter the shell 10. In other embodiments, the plurality of battery cells 21 can also be stacked along the first direction X.

[0204] A first buffer member 22 may be provided between two adjacent battery cells 21. The first buffer member 22 may be a foam, a rubber pad, or the like. A first buffer member 22 may be provided between every two adjacent battery cells 21 to provide a buffer space for the expansion of the battery cells 21, which is also beneficial to improving the ability of the battery pack 100 to resist external impacts. A first buffer member 22 may also be provided between some of the two adjacent battery cells 21, which can reduce the number of first buffer members 22 and is beneficial to improving the energy density and manufacturing cost of the battery pack 100. Along the stacking direction of the multiple battery cells 21, a first buffer member 22 may also be provided on the side of the battery cell 21 at the end facing away from the adjacent battery cell 21, which can protect the battery cell 21 at the end.

[0205] The battery cells 21 can be either soft-pack or steel-cased. Multiple battery cells 21 are electrically connected. Multiple battery cells 21 can be connected in series, in parallel, or in a hybrid configuration. Hybrid configuration refers to multiple battery cells 21 being connected in both series and parallel.

[0206] As shown in Figure 4, the battery cell 21 includes a packaging bag 23, an electrode assembly (not shown), and a tab 25 connected to the electrode assembly. The electrode assembly includes a separator (not shown), a positive electrode sheet (not shown) and a negative electrode sheet (not shown) of opposite polarity. The positive electrode sheet includes a positive active material layer (not shown) and a positive current collector (not shown). The negative electrode sheet includes a negative active material layer (not shown) and a negative current collector (not shown). Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative current collector can be made of copper, and the negative active material can be carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). The tabs 25 include a positive tab 24a and a negative tab 24b. The positive tab 24a is electrically connected to the positive current collector, and the negative tab 24b is electrically connected to the negative current collector.

[0207] As shown in FIG4 , the packaging bag 23 includes a sealing portion 231 and a packaging body 232. The sealing portion 231 is connected to three adjacent edges of the packaging body 232. The sealing portion 231 includes a first sealing portion 2311, a second sealing portion 2312, and a third sealing portion 2313, which are sequentially connected. The first sealing portion 2311 and the third sealing portion 2313 are arranged opposite each other, and the second sealing portion 2312 is connected between the first sealing portion 2311 and the third sealing portion 2313.

[0208] The active material portion of the positive electrode sheet, the active material portion of the negative electrode sheet, and at least a portion of the separator form the main body of the electrode assembly, which is housed within the package body 232. The positive electrode tab 24a and the negative electrode tab 24b extend from the same end of the main body to the sealing portion 231, and the packaging bag 23 extends from the sealing portion 231. For example, the positive electrode tab 24a and the negative electrode tab 24b extend from the packaging bag 23 from the second sealing portion 2312. In this embodiment, the first sealing portion 2311 and the third sealing portion 2313 are arranged opposite each other along the first direction X, with the first sealing portion 2311 being located near the first side plate 12 and the third sealing portion 2313 being located near the second side plate 13.

[0209] A first space 2310 is formed between the sealing portions 231 of two adjacent battery cells 21 . Optionally, foam may be provided in the first space 2310 .

[0210] In some embodiments, the battery module 20 further includes a first circuit board 26 (shown in FIG. 2 ). The positive tabs 24a and negative tabs 24b of the battery cells 21 extend from the packaging bag 23 and are electrically connected to the first circuit board 26. Multiple battery cells 21 are connected in series, in parallel, or in a hybrid configuration. The first circuit board 26 includes a total positive electrode 261 and a total negative electrode 262 of the electrode assembly. The battery module 20 can be charged and discharged via the total positive electrode 261 and the total negative electrode 262.

[0211] In one embodiment, the first circuit board 26 includes a printed circuit board (PCB). Alternatively, the first circuit board 26 may be a flexible printed circuit (FPC).

[0212] As shown in Figures 5 and 6, in some embodiments, the battery module 20 further includes a third heat conductor 27, a portion of which is arranged between two adjacent battery cells 21. Along the first direction X, a portion of the third heat conductor 27 extends to the space between the first side plate 12 and the multiple battery cells 21, and a portion of the third heat conductor 27 extends to the space between the second side plate 13 and the multiple battery cells 21.

[0213] The provision of the third heat conducting member 27 facilitates rapid heat dissipation of the battery cells 21 , thereby improving the heat dissipation capability of the battery pack 100 .

[0214] 5 , 6 and 7 , the third heat conductor 27 includes a bottom wall 271 and a side wall 272 , one end of the side wall 272 is connected to the edge of the bottom wall 271 , the bottom wall 271 and the side wall 272 together form a receiving cavity for the packaging body 232 that receives the battery cell 21 , and the side wall 272 is formed with a notch 273 for the receiving cavity from which the sealing portion 231 and the tab 25 extend.

[0215] The third heat conducting member 27 may be made of metal materials such as aluminum and copper. Of course, the third heat conducting member 27 may also be made of non-metallic materials such as rubber.

[0216] The sidewall 272 includes a first sidewall 2721, a second sidewall 2722, and a third sidewall 2723. The first sidewall 2721, the second sidewall 2722, and the third sidewall 2723 are respectively connected to three adjacent edges of the bottom wall 271. The bottom wall 271 is located between two adjacent battery cells 21. The first sidewall 2721 and the second sidewall 2722 are arranged opposite each other along the first direction X. Along the first direction X, the first sidewall 2721 is located between the battery cell 21 and the first side plate 12, and the second sidewall 2722 is located between the battery cell 21 and the second side plate 13. The third sidewall 2723 is connected to an edge of the bottom wall 271 in the second direction Y and is located between the second end plate 90 and the battery cell 21. A fifth opening 274 is formed at the end of the sidewall 272 facing away from the bottom wall 271.

[0217] A third heat conducting member 27 may be provided between each two adjacent battery cells 21 to facilitate rapid heat dissipation from each battery cell 21. Alternatively, a third heat conducting member 27 may be provided between some adjacent battery cells 21 to reduce the number of third heat conducting members 27, thereby saving costs and improving the energy density of the battery pack 100.

[0218] The battery module 20 may include a plurality of third heat conducting members 27, and the plurality of third heat conducting members 27 are stacked along the stacking direction of the plurality of battery cells 21. As shown in Figure 5, the fifth openings 274 of two adjacent third heat conducting members 27 are arranged relative to each other, and together define a subspace for accommodating the battery cells 21. One or more battery cells 21 may be arranged in each subspace, and two adjacent third heat conducting members 27 and the battery cell 21 located between the two adjacent third heat conducting members 27 may together form a battery cell 21 unit. A second buffer member 28 may be provided between two adjacent battery cell 21 units, and the second buffer member 28 may be foam, rubber pad, etc. The provision of the second buffer member 28 can provide space for the expansion of the battery cell 21 unit and improve the ability of the battery pack 100 to resist external impact.

[0219] In other embodiments, the battery module 20 may not include the third heat conducting member 27 (as shown in FIG. 3 ).

[0220] As shown in Figures 8-11, in an embodiment where the battery module 20 is not provided with the third heat conducting member 27, a first gap A1 formed between the first side plate 12 and the battery module 20 is the distance between the inner surface 121 of the first side plate and the first sealing portion 2311 of the battery cell 21. The first heat conducting member 30 is disposed within the first gap A1.

[0221] In an embodiment where the battery module 20 is not provided with the third heat conducting member 27 , the length of the first gap A1 along the first direction X is H1 , and H1 is 0.05 mm to 2.5 mm. For example, H1 is 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, etc.

[0222] Along the first direction X, the length of the first gap A1 is 0.05 mm to 2.5 mm, so the heat conduction path between the battery module 20 and the first side plate 12 is shorter, making the heat conduction path from the battery module 20 to the first side plate 12 smaller, thereby improving the heat dissipation capacity of the battery pack 100.

[0223] Furthermore, H1 can be between 0.1 mm and 1.9 mm. For example, H1 can be 0.1 mm, 0.3 mm, 0.6 mm, 0.9 mm, 1.3 mm, 1.6 mm, 1.9 mm, etc. Along the first direction X, the length of the first gap A1 is between 0.1 mm and 1.9 mm, further shortening the heat conduction path between the battery module 20 and the first side plate 12. This makes the heat conduction path from the battery module 20 to the first side plate 12 even smaller, thereby further improving the heat dissipation capability of the battery pack 100.

[0224] Furthermore, H1 can be between 0.1 mm and 1.4 mm. For example, H1 can be 0.2 mm, 0.7 mm, 0.8 mm, 1.2 mm, 1.4 mm, etc. Along the first direction X, the length of the first gap A1 is between 0.1 mm and 1.4 mm, which further shortens the heat conduction path between the battery module 20 and the first side plate 12, making the heat conduction path from the battery module 20 to the first side plate 12 smaller, thereby improving the heat dissipation capacity of the battery pack 100.

[0225] As shown in FIG. 12 to FIG. 15 , in an embodiment where the battery module 20 is provided with a third heat conducting member 27 , the first gap A1 is the distance between the inner surface 121 of the first side plate and the first side wall 2721 .

[0226] In the embodiment where the battery module 20 is provided with the third heat conducting member 27 , the length of the first gap A1 along the first direction X is H2 , and H2 is 0.05 mm to 2.5 mm. For example, H2 is 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, etc.

[0227] Furthermore, when H2 is 0.05 mm to 1.5 mm, the heat conduction path between the battery module 20 equipped with the third heat conductor 27 and the first side plate 12 is shorter, thereby reducing the heat conduction path from the battery module 20 to the first side plate 12, thereby improving the heat dissipation capacity of the battery pack 100. For example, H2 is 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.5 mm, etc.

[0228] Furthermore, when H2 is 0.1 mm to 1.1 mm, the heat conduction path between the battery module 20 having the third heat conductor 27 and the first side plate 12 is further shortened, making the heat conduction path from the battery module 20 to the first side plate 12 even smaller, thereby further improving the heat dissipation capacity of the battery pack 100. For example, H2 is 0.1 mm, 0.15 mm, 0.25 mm, 0.35 mm, 0.45 mm, 0.55 mm, 0.65 mm, 0.75 mm, 0.85 mm, 0.95 mm, 1.1 mm, etc.

[0229] Furthermore, when H2 is 0.1 mm to 0.6 mm, the heat conduction path between the battery module 20 and the first side plate 12 is further shortened, making the heat conduction path from the battery module 20 to the first side plate 12 smaller, thereby improving the heat dissipation capability of the battery pack 100. For example, H2 is 0.1 mm, 0.13 mm, 0.16 mm, 0.19 mm, 0.22 mm, 0.28 mm, 0.32 mm, 0.38 mm, 0.42 mm, 0.48 mm, 0.52 mm, 0.58 mm, 0.6 mm, etc.

[0230] The first heat conducting member 30 is disposed between the first side plate 12 and the battery module 20. Along the first direction X, the first heat conducting member 30 may contact the first side plate 12 and the battery module 20. Heat is conducted between the battery module 20 and the first side plate 12 via the first heat conducting member 30, thereby improving the heat dissipation efficiency of the battery pack 100. The first heat conducting member 30 is disposed between the first side plate 12 and the battery module 20, occupying the space between the first side plate 12 and the battery module 20. This makes the internal structure of the housing 10 more compact, reduces the risk of movement between the battery module 20 and other structures within the housing 10, and thereby improves the safety performance of the battery pack 100.

[0231] The first thermally conductive member 30 can be a colloid with good thermal conductivity, a metal member with good thermal conductivity, etc. In embodiments where the first thermally conductive member 30 is a thermally conductive colloid, the first thermally conductive member 30 can be formed by curing the adhesive applied to the surface of the first side panel 12 facing the battery module 20 and / or the side of the battery module 20 facing the first side panel 12, thereby improving the stability of the internal structure of the housing 10. The first thermally conductive member 30 can also be a solid thermally conductive adhesive strip, a metal member, etc.

[0232] As shown in FIG. 2 , in some embodiments, a second gap A2 exists between the second side plate 13 and the battery module 20 ; the battery pack 100 further includes a second heat conducting member 50 , which is disposed in the second gap A2 .

[0233] Disposing the second heat conducting member 50 between the second side plate 13 and the battery module 20 is beneficial to improving the heat exchange efficiency between the battery module 20 and the second side plate 13 , thereby further improving the heat dissipation efficiency of the battery pack 100 .

[0234] As shown in Figures 16 and 17 , in an embodiment where the battery module 20 is not provided with the third heat conducting member 27, the second gap A2 formed between the second side plate 13 and the battery module 20 is the distance between the inner surface 131 of the second side plate and the third sealing portion 2313 of the battery cell 21. The second heat conducting member 50 is disposed within the second gap A2.

[0235] In an embodiment where the battery module 20 is not provided with the third heat conducting member 27 , the length of the second gap A2 along the first direction X is L1 , and L1 is 0.05 mm to 2.5 mm. For example, L1 is 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, etc.

[0236] Along the first direction X, the length of the second gap A2 is 0.05 mm to 2.5 mm, so the heat conduction path between the battery module 20 and the second side plate 13 is shorter, making the heat conduction path from the battery module 20 to the second side plate 13 smaller, thereby improving the heat dissipation capacity of the battery pack 100.

[0237] Furthermore, L1 can be between 0.1 mm and 1.9 mm. For example, L1 can be 0.1 mm, 0.3 mm, 0.6 mm, 0.9 mm, 1.3 mm, 1.6 mm, 1.9 mm, etc. Along the first direction X, the length of the second gap A2 is between 0.1 mm and 1.9 mm, further shortening the heat conduction path between the battery module 20 and the second side plate 13. This makes the heat conduction path from the battery module 20 to the second side plate 13 even smaller, thereby further improving the heat dissipation capacity of the battery pack 100.

[0238] Furthermore, L1 can be between 0.1 mm and 1.4 mm. For example, L1 can be 0.2 mm, 0.7 mm, 0.8 mm, 1.2 mm, 1.4 mm, etc. Along the first direction X, the length of the second gap A2 is between 0.1 mm and 1.4 mm, which further shortens the heat conduction path between the battery module 20 and the second side plate 13, making the heat conduction path from the battery module 20 to the second side plate 13 smaller, thereby improving the heat dissipation capacity of the battery pack 100.

[0239] As shown in Figures 18 and 19, in an embodiment where the battery module 20 is provided with a third heat conductor 27, the second gap A2 formed between the second side plate 13 and the battery module 20 is the distance between the inner surface 131 of the second side plate and the second side wall 2722 of the third heat conductor 27.

[0240] In the embodiment where the battery module 20 is provided with the third heat conducting member 27 , the length of the second gap A2 along the first direction X is L2 , and L2 is 0.05 mm to 2.5 mm. For example, L2 is 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, etc.

[0241] Furthermore, when L2 is 0.05 mm to 1.5 mm, the heat conduction path between the battery module 20 equipped with the third heat conductor 27 and the second side plate 13 is shorter, thereby reducing the heat conduction path from the battery module 20 to the second side plate 13, thereby improving the heat dissipation capacity of the battery pack 100. For example, L2 is 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.5 mm, etc.

[0242] Furthermore, when L2 is 0.1 mm to 1.1 mm, the heat conduction path between the battery module 20 equipped with the third heat conductor 27 and the second side plate 13 is further shortened, making the heat conduction path from the battery module 20 to the second side plate 13 even smaller, thereby further improving the heat dissipation capacity of the battery pack 100. For example, H2 is 0.1 mm, 0.15 mm, 0.25 mm, 0.35 mm, 0.45 mm, 0.55 mm, 0.65 mm, 0.75 mm, 0.85 mm, 0.95 mm, 1.1 mm, etc.

[0243] Furthermore, when L2 is 0.1 mm to 0.6 mm, the heat conduction path between the battery module 20 and the second side plate 13 is further shortened, making the heat conduction path from the battery module 20 to the second side plate 13 smaller, thereby improving the heat dissipation capacity of the battery pack 100. For example, H2 is 0.1 mm, 0.13 mm, 0.16 mm, 0.19 mm, 0.22 mm, 0.28 mm, 0.32 mm, 0.38 mm, 0.42 mm, 0.48 mm, 0.52 mm, 0.58 mm, 0.6 mm, etc.

[0244] The second heat conducting member 50 is disposed between the second side plate 13 and the battery module 20. Along the first direction X, the second heat conducting member 50 can contact the second side plate 13. The second heat conducting member 50 can contact the battery module 20. Heat is conducted between the battery module 20 and the second side plate 13 via the second heat conducting member 50, which helps improve the heat dissipation efficiency of the battery pack 100. The second heat conducting member 50 is disposed between the second side plate 13 and the battery module 20, utilizing the space between the second side plate 13 and the battery module 20. This makes the internal structure of the housing 10 more compact, reduces the risk of movement between the battery module 20 and other structures within the housing 10, and thus helps improve the safety performance of the battery pack 100. The first heat conducting member 30 and the second heat conducting member 50 can jointly restrict the movement of the battery module 20 within the housing 10.

[0245] The second heat-conducting member 50 can be a colloid with good thermal conductivity, a metal member with good thermal conductivity, etc. In an embodiment where the second heat-conducting member 50 is a thermally conductive adhesive, the second heat-conducting member 50 can be formed by curing the liquid adhesive applied to the surface of the second side plate 13 facing the battery module 20 and / or the side of the battery module 20 facing the second side plate 13, thereby improving the stability of the internal structure of the housing 10. The second heat-conducting member 50 can also be a solid thermally conductive adhesive strip, a metal member, etc.

[0246] In some embodiments, the bottom plate 11 , the first side plate 12 and the second side plate 13 are integrally formed.

[0247] The bottom plate 11, first side plate 12, and second side plate 13 are integrally formed, which means that the bottom plate 11, first side plate 12, and second side plate 13 are formed by an integral molding method, which can be stamping, casting, injection molding, bending, etc. The bottom plate 11 and the two side plates are integrally formed, making the housing 10 easier to process and form.

[0248] In other embodiments, the bottom plate 11, the first side plate 12, and the second side plate 13 may be provided separately and then connected to form the U-shaped housing 10. For example, the bottom plate 11, the first side plate 12, and the second side plate 13 may be welded together, the bottom plate 11, the first side plate 12, and the second side plate 13 may be adhesively bonded together, or the bottom plate 11, the first side plate 12, and the second side plate 13 may be bolted together, etc. This facilitates the provision of appropriate first side plate 12, second side plate 13, and bottom plate 11 according to actual working conditions. When the bottom plate 11, the first side plate 12, and the second side plate 13 are detachably connected, the maintenance and replacement of the bottom plate 11, the first side plate 12, and the second side plate 13 are also facilitated.

[0249] In some embodiments, the thickness of the first side plate 12 along the first direction X is 0.5 mm to 4 mm, which helps to strengthen the protection of the battery module 20. Optionally, the thickness of the first side plate 12 along the first direction X is 1 mm to 3 mm, which helps to facilitate the assembly of the battery module 20. Optionally, the thickness of the first side plate 12 along the first direction X is 0.5 mm to 1.8 mm, which further helps to facilitate the assembly of the battery module 20 and reduce the weight of the battery pack 100.

[0250] In some embodiments, the thickness of the second side plate 13 along the first direction X is 0.5-4 mm, which helps to strengthen the protection of the battery module 20. Optionally, the thickness of the second side plate 13 along the first direction X is 1-3 mm, which facilitates the assembly of the battery module 20. Optionally, the thickness of the second side plate 13 along the first direction X is 0.5-1.8 mm, which further facilitates the assembly of the battery module 20 and reduces the weight of the battery pack 100.

[0251] As shown in Figures 20 and 21, in some embodiments, a first reinforcement member 60 is provided at the end of the housing 10 in the second direction Y. The provision of the first reinforcement member 60 can increase the strength and thickness of the end region of the housing 10 in the second direction Y, thereby increasing the connection area and sealing area between the first end plate 80 and one end of the housing 10 in the second direction Y, thereby improving the connection strength and sealing performance.

[0252] The first reinforcement member 60 is disposed on the outer surface of one end of the housing 10 along the second direction Y. The first reinforcement member 60 covers a portion of the first side panel 12 and a portion of the second side panel 13. One end of the first reinforcement member 60 along the second direction Y may be flush with an end surface of the housing 10 along the third direction Z.

[0253] The first reinforcement member 60 can be fixedly connected to the housing 10, such as by welding, bonding, etc. The first reinforcement member 60 can also be detachably connected to the housing 10, such as by bolting, screwing, etc. The material of the first reinforcement member 60 and the material of the housing 10 can be the same or different.

[0254] Please continue to refer to Figures 20 and 21. In some embodiments, the first reinforcement 60 is U-shaped, and the first reinforcement 60 is fixedly connected to the outer surface of the shell 10. The first reinforcement 60 includes a first reinforcement portion 61, a second reinforcement portion 62, and a third reinforcement portion 63. The first reinforcement portion 61 and the second reinforcement portion 62 are connected by the third reinforcement portion 63, together forming a U-shaped first reinforcement 60. The first reinforcement portion 61 is fixedly connected to the outer surface 122 of the first side plate, for example, the first reinforcement portion 61 is welded to the outer surface 122 of the first side plate. The second reinforcement portion 62 is fixedly connected to the outer surface 132 of the second side plate, for example, the second reinforcement portion 62 is welded to the outer surface 132 of the second side plate. The third reinforcement portion 63 is fixedly connected to the outer surface of the bottom plate 11, for example, the third reinforcement portion 63 is welded to the outer surface of the bottom plate 11.

[0255] In some embodiments, a second reinforcement member 70 is provided at the other end of the housing 10 in the second direction Y. The second reinforcement member 70 is spaced apart from the first reinforcement member 60 along the second direction Y. The provision of the second reinforcement member 70 can increase the strength and thickness of the end region of the housing 10 in the second direction Y, thereby increasing the connection area and sealing area between the first end plate 80 and the end of the housing 10 in the second direction Y, thereby improving the connection strength and sealing performance.

[0256] The second reinforcement member 70 is disposed on the outer surface of the other end of the housing 10 along the second direction Y. The second reinforcement member 70 covers a portion of the first side panel 12 and a portion of the second side panel 13. An end of the second reinforcement member 70 along the second direction Y facing away from the first reinforcement member 60 may be flush with an end surface of the housing 10 along the third direction Z.

[0257] The second reinforcement member 70 can be fixedly connected to the housing 10, such as by welding, bonding, etc. The second reinforcement member 70 can also be detachably connected to the housing 10, such as by bolting, screwing, etc. The material of the second reinforcement member 70 and the material of the housing 10 can be the same or different.

[0258] 20 and 21 , in some embodiments, the second reinforcement member 70 is U-shaped, and the second reinforcement member 70 is fixedly connected to the outer surface of the shell 10. The second reinforcement member 70 includes a fourth reinforcement portion 71, a fifth reinforcement portion 72, and a sixth reinforcement portion 73. The fourth reinforcement portion 71 and the fifth reinforcement portion 72 are connected by the sixth reinforcement portion 73, together forming a U-shaped second reinforcement member 70. The fourth reinforcement portion 71 is fixedly connected to the outer surface 122 of the first side plate, for example, the fourth reinforcement portion 71 is welded to the outer surface 122 of the first side plate. The fifth reinforcement portion 72 is fixedly connected to the outer surface 132 of the second side plate, for example, the fifth reinforcement portion 72 is welded to the outer surface 132 of the second side plate. The sixth reinforcement portion 73 is fixedly connected to the outer surface of the bottom plate 11, for example, the sixth reinforcement portion 73 is welded to the outer surface of the bottom plate 11.

[0259] The outer surface 122 of the first side panel is the surface of the first side panel 12 facing away from the battery module 20 along the first direction X. The outer surface 122 of the first side panel is disposed opposite the inner surface 121 of the first side panel. The outer surface 132 of the second side panel is the surface of the second side panel 13 facing away from the battery module 20 along the first direction X. The outer surface 132 of the second side panel is disposed opposite the inner surface 131 of the second side panel. The outer surface of the bottom panel 11 is the surface of the bottom panel 11 facing away from the battery module 20 along the third direction Z. The outer surface of the bottom panel 11 is disposed opposite the inner surface of the bottom panel 11.

[0260] With reference to Figures 1, 2, and 22, in some embodiments, the battery pack 100 further includes a first end plate 80 and a second end plate 90, which are arranged along the second direction Y; the first side plate 12 and the second side plate 13 are both fixedly connected to the first end plate 80, and the first side plate 12 and the second side plate 13 are both fixedly connected to the second end plate 90, and the first end plate 80, the second end plate 90 and the shell 10 form a box body Q having a first opening Q1, and the first opening Q1 is opposite to the bottom plate 11, and the battery module 20 is accommodated in the box body Q.

[0261] The first end plate 80, the second end plate 90, and the shell 10 together form a box body Q having a first opening Q1. The box body Q can better protect the battery module 20, which is beneficial to improving the safety performance of the battery pack 100 and reducing the risk of damage to the structure within the box body Q. The first side plate 12 and the second side plate 13 are both fixedly connected to the first end plate 80, and the first side plate 12 and the second side plate 13 are both fixedly connected to the second end plate 90, which is beneficial to improving the structural strength of the box body Q. The first end plate 80 and the second end plate 90 also have a restraining effect on the first side plate 12 and the second side plate 13, alleviating the problem of the first side wall 2721 and the second side wall 2722 deforming in a direction away from each other.

[0262] The material of the first end plate 80 and the material of the housing 10 may be the same or different. The material of the second end plate 90 and the material of the housing 10 may be the same or different.

[0263] The first side panel 12 and the second side panel 13 are both fixedly connected to the first end panel 80, which means that there is a stable connection between the first side panel 12 and the first end panel 80, and there is a stable connection between the second side panel 13 and the first end panel 80. The first side panel 12 and the second side panel 13 can both be detachably connected to the first end panel 80, such as by bolt connection, screw connection, snap connection, etc., to facilitate the maintenance and replacement of the first side panel 12 and the first end panel 80. Taking the bolt connection as an example, as shown in FIG22 , a plurality of first threaded holes 81 are provided on the first end panel 80, and a second threaded hole 123 is provided on the housing 10. Some of the first threaded holes 81 and the second threaded holes 123 are coaxially arranged along the first direction X, and are threadedly connected to the first threaded holes 81 and the second threaded holes 123 by bolts, thereby achieving a fixed connection between the first end panel 80 and the first side panel 12. The shell 10 is also provided with a third threaded hole 133. Part of the first threaded hole 81 and the third threaded hole 133 are coaxially arranged along the first direction X, and are threadedly connected to the first threaded hole 81 and the third threaded hole 133 by bolts, thereby achieving a fixed connection between the first end plate 80 and the second side plate 13.

[0264] The second threaded hole 123 can be directly provided on the first side plate 12 or indirectly provided on the first side plate 12. In an embodiment where the first reinforcement member 60 is provided at the end of the housing 10 corresponding to the first end plate 80, the second threaded hole 123 can be provided in the first reinforcement portion 61 of the first reinforcement member 60, thereby achieving the second threaded hole 123 being indirectly provided on the first side plate 12. After the first threaded hole 81 and the second threaded hole 123 are connected by bolts, the first reinforcement member 60 and the first end plate 80 are also fixedly connected.

[0265] The third threaded hole 133 can be directly provided on the second side plate 13 or indirectly provided on the second side plate 13. In an embodiment where the first reinforcement member 60 is provided at the end of the housing 10 corresponding to the first end plate 80, the third threaded hole 133 can be provided in the second reinforcement portion 62 of the first reinforcement member 60, thereby achieving indirect provision of the third threaded hole 133 on the second side plate 13. After the first threaded hole 81 and the third threaded hole 133 are connected by bolts, the first reinforcement member 60 and the first end plate 80 are also fixedly connected.

[0266] The first side plate 12 and the second side plate 13 are both fixedly connected to the second end plate 90, which means that there is a stable connection between the first side plate 12 and the second end plate 90, and there is a stable connection between the second side plate 13 and the second end plate 90. The first side plate 12 and the second side plate 13 can both be detachably connected to the second end plate 90, such as by bolt connection, screw connection, snap connection, etc., to facilitate the maintenance and replacement of the first side plate 12 and the second end plate 90, as well as the maintenance and replacement of the second side plate 13 and the second end plate 90. Taking the bolt connection as an example, as shown in FIG22 , the second end plate 90 is provided with a plurality of fourth threaded holes 91, and the housing 10 is provided with a fifth threaded hole 124. Some of the fourth threaded holes 91 and the fifth threaded hole 124 are coaxially arranged along the first direction X, and are threadedly connected to the fourth threaded holes 91 and the fifth threaded hole 124 by bolts, thereby achieving a fixed connection between the second end plate 90 and the first side plate 12. The shell 10 is provided with a sixth threaded hole 134, and part of the fourth threaded hole 91 and the sixth threaded hole 134 are coaxially arranged along the first direction X, and are threadedly connected to the fourth threaded hole 91 and the sixth threaded hole 134 by bolts, thereby achieving a fixed connection between the second end plate 90 and the second side plate 13.

[0267] The fifth threaded hole 124 can be directly provided on the first side plate 12 or indirectly provided on the first side plate 12. In an embodiment where the second reinforcement member 70 is provided at the end of the housing 10 corresponding to the second end plate 90, the fifth threaded hole 124 can be provided in the fourth reinforcement portion 71 of the second reinforcement member 70, thereby achieving indirect provision of the fifth threaded hole 124 on the first side plate 12. After the fifth threaded hole 124 and the fourth threaded hole 91 are connected by bolts, the second reinforcement member 70 and the second end plate 90 are also fixedly connected.

[0268] The sixth threaded hole 134 can be directly provided on the second side plate 13 or indirectly provided on the second side plate 13. In an embodiment where the second reinforcement member 70 is provided at the end of the housing 10 corresponding to the second end plate 90, the sixth threaded hole 134 can be provided in the fifth reinforcement portion 72 of the second reinforcement member 70, thereby achieving indirect provision of the sixth threaded hole 134 on the second side plate 13. After the sixth threaded hole 134 and the fourth threaded hole 91 are connected by bolts, the second reinforcement member 70 and the second end plate 90 are also fixedly connected.

[0269] The fourth opening 16 of the housing 10 is a portion of the first opening Q1 of the box body Q.

[0270] As shown in Figures 22-26, in an embodiment in which the housing 10 is provided with a first reinforcement member 60 and a second reinforcement member 70 at both ends along the second direction Y, the first reinforcement member 60 is provided with a first slot 64, and the first end plate 80 includes a first end plate body 82 and a first engaging portion 83. The first engaging portion 83 is provided at an edge of the first end plate body 82 and is engaged with the first slot 64. The first engaging portion 83 of the first end plate 80 is engaged with the first slot 64 of the first reinforcement member 60, thereby accurately positioning the first end plate 80 and the housing 10, thereby facilitating a stable connection between the first end plate 80 and the housing 10.

[0271] In some embodiments, along the third direction Z, the second threaded hole 123 and the third threaded hole 133 are closer to the first opening Q1 relative to the first clamping groove 64 , which is beneficial to the recovery of the first side plate 12 and the second side plate 13 .

[0272] The first engaging groove 64 is provided on the surface of the first reinforcement 60 facing away from the housing 10. The first engaging groove 64 can extend to the end surface of the first reinforcement 60 that is flush with the housing 10 along the second direction Y, thereby forming a first notch on the end surface of the first reinforcement 60 along the second direction Y. As shown in FIG24 , the first engaging groove 64 is provided on both the surface of the first reinforcement portion 61 facing away from the first side panel 12 and the surface of the second reinforcement portion 62 facing away from the second side panel 13. A first angle α1 (shown in FIG25 ) is formed between the first engaging groove 64 and the second direction. This first angle α1 is an acute angle, which ensures that the first engaging portion 83 and the first engaging groove 64 are more secure when mated.

[0273] Each first reinforcing portion 61 is provided with a plurality of first latching slots 64 at intervals along the third direction Z, and each second reinforcing portion 62 is provided with a plurality of first latching slots 64 at intervals along the third direction Z. Of course, one first latching slot 64 may also be provided on the first reinforcing portion 61, and one first latching slot 64 may also be provided on the second reinforcing portion 62.

[0274] The surface of the third reinforcement portion 63 facing away from the bottom plate 11 may be provided with a first latching groove 64 or may not be provided with the first latching groove 64 .

[0275] In some embodiments, the first reinforcement member 60 is used to position the first slot 64. Before the first slot 64 is provided, its thickness in the direction away from the battery module 20 is greater than the thickness of other locations of the first reinforcement member 60 in the direction away from the battery module 20. This compensates for the reduction in thickness of the first reinforcement member 60 at the corresponding location resulting from the provision of the first slot 64, thereby alleviating the problem of the first slot 64 reducing the strength of the first reinforcement member 60. Of course, the first reinforcement member 60 may also have a uniform thickness structure.

[0276] As shown in Figures 22-26, in an embodiment in which the housing 10 is provided with a first reinforcement member 60 and a second reinforcement member 70 at both ends along the second direction Y, the second reinforcement member 70 is provided with a second snap-in slot 74, and the second end plate 90 includes a second end plate body 92 and a second snap-in portion 93. The second snap-in portion 93 is provided at an edge of the second end plate body 92 and snap-in to the second snap-in slot 74. The second snap-in portion 93 of the second end plate 90 snaps into the second snap-in slot 74 of the second reinforcement member 70, thereby accurately positioning the second end plate 90 and the housing 10, thereby facilitating a more stable connection between the second end plate 90 and the housing 10.

[0277] In some embodiments, along the third direction Z, the fifth threaded hole 124 and the sixth threaded hole 134 are closer to the first opening Q1 relative to the second slot 74 , which is beneficial for the restoration of the first side plate 12 and the second side plate 13 .

[0278] As shown in Figures 23 and 26, the second slot 74 is provided on the surface of the second reinforcement member 70 facing away from the housing 10. The second slot 74 can extend to the end surface of the second reinforcement member 70 that is flush with the housing 10 along the second direction Y, thereby forming a second notch on the end surface of the second reinforcement member 70 along the second direction Y. The second slot 74 is provided on both the surface of the fourth reinforcement portion 71 facing away from the first side panel 12 and the surface of the fifth reinforcement portion 72 facing away from the second side panel 13. A second angle α2 (shown in Figure 26) is formed between the second slot 74 and the second direction Y. This second angle α2 is an obtuse angle, which ensures that the second engaging portion 93 and the second slot 74 are more secure when mated.

[0279] Each fourth reinforcing portion 71 is provided with a plurality of second engaging slots 74 at intervals along the third direction Z, and each fifth reinforcing portion 72 is provided with a plurality of second engaging slots 74 at intervals along the third direction Z. Of course, one second engaging slot 74 may also be provided on the fourth reinforcing portion 71, and one second engaging slot 74 may also be provided on the fifth reinforcing portion 72.

[0280] The surface of the sixth reinforcement portion 73 facing away from the bottom plate 11 may be provided with a second latching groove 74 or may not be provided with the second latching groove 74 .

[0281] Similar to the first reinforcement member 60, in some embodiments, the second reinforcement member 70 is used to position the second slot 74. Before the second slot 74 is provided, its thickness in the direction away from the battery module 20 is greater than the thickness of the second reinforcement member 70 at other locations in the direction away from the battery module 20. This compensates for the reduction in thickness of the second reinforcement member 70 at the corresponding location resulting from the second slot 74, thereby alleviating the problem of the second slot 74 reducing the strength of the second reinforcement member 70. Of course, the second reinforcement member 70 may also have a uniform thickness structure.

[0282] As shown in Figure 22, the first end plate body 82 is the portion of the first end plate 80 that is opposite to the shell 10 in the second direction Y. The first end plate body 82 covers the second opening 14 of the shell 10 along the second direction Y. The first clamping portion 83 and the first end plate body 82 can be integrally formed, or they can be separately provided and connected into an integral structure. The first clamping portion 83 can enter the first clamping slot 64 from the first notch of the first clamping slot 64 located on the end face of the first reinforcement 60 along the second direction Y. The first clamping portion 83 can be partially clamped in the first clamping slot 64, or it can be fully clamped in the first clamping slot 64. Along the second direction Y, the first end plate body 82 has a first wing 84 on the side facing away from the battery module 20, which is beneficial to improving the heat dissipation efficiency from the first end plate 80. The side of the first end plate body 82 facing the battery module 20 is flat, which is convenient for assembling the internal structure of the battery pack 100.

[0283] The second end plate body 92 is the portion of the second end plate 90 that is opposite to the shell 10 in the second direction Y. The second end plate body 92 covers the third opening 15 of the shell 10 along the second direction Y. The second clamping portion 93 and the second end plate body 92 can be integrally formed, or they can be separately arranged and connected into an integral structure. The second clamping portion 93 can enter the second clamping slot 74 from the second notch of the second clamping slot 74 located on the end face of the second reinforcement 70 along the second direction Y. The second clamping portion 93 can be partially clamped in the second clamping slot 74, or it can be fully clamped in the second clamping slot 74. Along the second direction Y, the second end plate body 92 has a second wing 94 on the side facing away from the battery module 20, which is beneficial to improving the heat dissipation efficiency from the second end plate 90. The side of the second end plate body 92 facing the battery module 20 is flat, which is convenient for assembling the internal structure of the battery pack 100.

[0284] As shown in Figures 27 and 28, in some embodiments, the first clamping portion 83 includes a first limiting plate 831 and a first protrusion 832. The first limiting plate 831 is connected to the edge of the first end plate body 82 and is located on the side of the first reinforcement 60 away from the battery module 20 along the first direction X. The first protrusion 832 is protruded from the surface of the first limiting plate 831 facing the first reinforcement 60 and is clamped in the first clamping slot 64.

[0285] The first limiting plate 831 is connected to the edge of the first end plate body 82 and is located on the side of the first reinforcement 60 away from the battery module 20 along the first direction X, which can limit the relative movement of the shell 10 and the first end plate 80 in the first direction X. The first protrusion 832 is protruded from the surface of the first limiting plate 831 facing the first reinforcement 60 and is clamped in the first card slot 64, which can limit the first end plate 80 from detaching from the shell 10, thereby improving the relative stability of the first end plate 80 and the shell 10.

[0286] One end of the first limiting plate 831 along the second direction Y is connected to the first end plate body 82, and the other end extends to the side of the first reinforcement 60 facing away from the battery module 20. For example, a first latching slot 64 is provided on the side of the first reinforcement 61 facing away from the battery module 20, and the first limiting plate 831 of the first clamping portion 83 corresponding to the first latching slot 64 on the first reinforcement 61 extends to the side of the first reinforcement 61 facing away from the battery module 20.

[0287] When the first protrusion 832 is locked in the first locking groove 64 , the surface of the first limiting plate 831 facing the first reinforcement 60 and the surface of the first reinforcement 60 facing away from the battery module 20 may be in contact or may form a gap.

[0288] The drawings of the second clamping portion 93 correspond to the drawings of the first clamping portion 83. The second clamping portion 93 includes a second stopper plate (not shown) and a second protrusion (not shown). The second stopper plate 931 is connected to an edge of the second end plate body 92 and is located on the side of the second reinforcement member 70 facing away from the battery module 20 along the first direction X. The second protrusion is provided on the surface of the second stopper plate facing the second reinforcement member 70 and is retained within the second retaining groove 74. The second stopper plate 931 is connected to an edge of the second end plate body 92 and is located on the side of the second reinforcement member 70 facing away from the battery module 20 along the first direction X. It limits relative movement of the housing 10 and the second end plate 90 in the first direction X. The second protrusion is provided on the surface of the second stopper plate 931 facing the second reinforcement member 70 and is retained within the second retaining groove 74. It limits the second end plate 90 from separating from the housing 10, thereby improving the relative stability of the second end plate 90 and the housing 10.

[0289] One end of the second limiting plate 931 along the second direction Y is connected to the second end plate body 92, and the other end extends to the side of the second reinforcement member 70 facing away from the battery module 20. For example, a second latching slot 74 is provided on the side of the fourth reinforcement portion 71 facing away from the battery module 20, and the second limiting plate 931 of the second clamping portion 93 corresponding to the second latching slot 74 on the fourth reinforcement portion 71 extends to the side of the fourth reinforcement portion 71 facing away from the battery module 20.

[0290] When the second protrusion 932 is locked in the second locking groove 74 , the surface of the second limiting plate 931 facing the second reinforcement 70 and the surface of the second reinforcement 70 facing away from the battery module 20 may be in contact or may form a gap.

[0291] In some embodiments, the first reinforcement 60 is fixedly connected to the outer surface of the housing 10 , and the first reinforcement 60 , the first side plate 12 and the first end plate 80 are sealed together, such as with a sealing ring, glue, welding, etc.

[0292] In some embodiments, the second reinforcement member is fixedly connected to the outer surface of the housing 10, and the second reinforcement member 70, the second side plate 13 and the second end plate 90 are sealed together, such as with a sealing ring, glue, welding, etc.

[0293] In some embodiments, a first seal W1 (shown in Figure 2) is provided between one end of the shell 10 in the second direction Y and the first end plate 80; a second seal W2 (shown in Figure 2) is provided between the other end of the shell 10 in the second direction Y and the second end plate 90.

[0294] The provision of the first seal W1 and the second seal W2 can improve the sealing performance of the battery pack 100 and reduce the risk of impurities from the external environment entering the battery pack 100, which is beneficial to extending the service life of the battery pack 100 and improving the safety performance of the battery pack 100.

[0295] The first sealing member W1 and the second sealing member W2 can be solid rubber pads. The first sealing member can also be formed by curing a sealant applied between the end of the housing 10 in the second direction Y and the first end plate 80. In this embodiment, the cured sealant can also serve to connect the first end plate 80 and the housing 10. The second sealing member W2 can also be formed by curing a sealant applied between the end of the housing 10 in the second direction Y and the second end plate 90. In this embodiment, the cured sealant can also serve to connect the second end plate 90 and the housing 10.

[0296] In an embodiment in which a first reinforcement 60 and a second reinforcement 70 are provided at the end of the shell 10 along the second direction Y, the first seal can be partially located between the end of the shell 10 and the first end plate 80, and another portion is located between the end surface of the first reinforcement 60 along the second direction Y and the first end plate 80. The second seal can be partially located between the end of the shell 10 and the second end plate 90, and another portion is located between the end surface of the second reinforcement 70 along the second direction Y and the second end plate 90, thereby increasing the area and improving the sealing effect.

[0297] As shown in FIG. 29 , in some embodiments, a first groove 85 is formed on the surface of the first end plate 80 facing the housing 10 . The first groove 85 is arranged along the edge of the first end plate 80 , and the first sealing member W1 is arranged in the first groove 85 .

[0298] The first seal W1 is arranged in the first groove 85. It can be understood that the first seal W1 is embedded in the first end plate 80. The first seal W1 and the first end plate 80 share a part of the space, which not only provides sealing performance, but also helps to reduce the volume of the battery pack 100, thereby facilitating the miniaturization of the battery pack 100 structure.

[0299] Specifically, the first groove 85 is provided at the edge of the first end plate body 82. The first groove 85 extends along the edge of the first end plate 80, and along the extension direction of the first groove 85, the extension trajectory of the first groove 85 is U-shaped to match the shape of the end portion of the housing 10 along the second direction Y.

[0300] The first sealing member W1 is disposed in the first groove 85 , that is, the first sealing member W1 is accommodated in the first groove 85 . The first sealing member W1 may be fully accommodated in the first groove 85 , or may be partially accommodated in the first groove 85 .

[0301] In some embodiments, a second groove (not shown) is formed on the surface of the second end plate 90 facing the housing 10. The second groove is provided along the edge of the second end plate 90, and the second sealing member W2 is provided in the second groove. The configuration of the second groove can refer to the configuration of the first groove 85.

[0302] The second seal W2 is arranged in the first groove 85. It can be understood that the second seal W2 is accommodated in the second end plate 90. The second seal W2 and the second end plate 90 share a part of the space, which not only improves the sealing performance, but also helps to reduce the volume of the battery pack 100, thereby facilitating the miniaturization of the battery pack 100 structure.

[0303] Specifically, the second groove is provided at the edge of the second end plate body 92. The second groove extends along the edge of the first end plate 80, and along the extension direction of the second groove, the extension track of the second groove is U-shaped to match the shape of the end of the housing 10 along the second direction Y.

[0304] The second sealing member W2 is disposed in the second groove, which can be understood as the second sealing member W2 being accommodated in the second groove.

[0305] In other embodiments, the first end plate 80 may not be provided with the first groove 85, and the first seal W1 may be abutted between the surface of the first end plate 80 facing the shell 10 and the end of the shell 10 along the second direction Y. The second end plate 90 may also not be provided with the second groove, and the second seal W2 may be abutted between the surface of the second end plate 90 facing the shell 10 and the end of the shell 10 along the second direction Y, so as to simplify the structure of the first end plate 80 and the second end plate 90.

[0306] 1 , 2 , and 30 , in some embodiments, the battery pack 100 further includes a cover 110 , which seals the first opening Q1 of the box body Q; the battery pack 100 further includes a second circuit board 120 , which is located on the side of the battery module 20 facing away from the bottom plate 11 .

[0307] The cover 110 seals the first opening Q1 of the box Q, thereby better protecting the structures within the box Q and reducing the risk of damage, thereby extending the service life of the structures within the box Q. The second circuit board 120 is located on the side of the battery module 20 facing away from the bottom plate 11. That is, the second circuit board 120 is disposed near the first opening Q1 of the box Q, facilitating installation of the second circuit board 120.

[0308] As shown in FIG. 30 , a cavity is formed inside the cover 110 , and the cavity of the cover 110 and the accommodating space of the box Q together accommodate the internal structure of the battery pack 100 .

[0309] The housing 10, the first end plate 80, and the second end plate 90 are all connected to the cover 110. The housing 10, the first end plate 80, and the second end plate 90 can all be connected to the cover 110 by welding, bolting, clamping, etc. For example, with reference to Figures 1, 2, 23, and 30, a seventh threaded hole 86 is provided on the first end plate 80, an eighth threaded hole 96 is provided on the second end plate 90, and the cover 110 is provided with a plurality of ninth threaded holes 1101 corresponding to the seventh threaded hole 86 and the eighth threaded hole 96. Some of the ninth threaded holes 1101 are coaxially arranged with the seventh threaded hole 86 along the third direction Z, and another portion of the ninth threaded holes 1101 are coaxially arranged with the eighth threaded hole 96 along the third direction Z. The cover body 110 is connected to the first end plate 80 and the cover body 110 is connected to the second end plate 90 by threaded connection with the seventh threaded hole 86 and the ninth threaded hole 1101 through bolts, and the cover body 110 is connected to the first end plate 80 and the second end plate 90, so that the shell 10, the two end plates and the cover body 110 are connected into an integral structure, so that the cover body 110 covers the first opening Q1 of the box body Q.

[0310] The second circuit board 120 is located on the side of the battery module 20 away from the bottom plate 11. Specifically, the second circuit board 120 is arranged along the third direction Z on the side of the battery module 20 away from the bottom plate 11 and close to the first opening Q1 of the box Q to facilitate installation of the second circuit board 120.

[0311] The second circuit board 120 may be provided with detection elements for detecting internal parameters of the battery pack 100 , such as a temperature sensor, a voltage detection element, a pressure sensor, and the like.

[0312] In one embodiment, the second circuit board 120 includes a printed circuit board (PCB), and a plurality of wires (not shown) are provided on the second circuit board 120. Optionally, the second circuit board 120 includes a flexible printed circuit (FPC).

[0313] In one embodiment, the second circuit board 120 includes a BMS component (Battery Management System), which includes multiple electronic components. The multiple electronic components can realize functions such as data collection, control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21 battery module 20.

[0314] In one embodiment, along the second direction Y, the first circuit board 26 is arranged between the first end plate 80 and the battery module 20, and the second circuit board 120 is located on the side of the battery module 20 away from the bottom plate 11 along the third direction Z. The first circuit board 26 and the second circuit board 120 are located at different positions of the battery module 20 and do not interfere with each other, which not only facilitates the installation of the first circuit board 26 and the second circuit board 120, but also reduces the risk of short circuit of the battery pack 100.

[0315] As shown in FIG31 , in some embodiments, the inner surface 121 of the first side plate is provided with a plurality of first protrusions 125 , which are spaced apart along the third direction Z. Each first protrusion 125 extends along the second direction Y. Along the first direction X, the first protrusion 125 extends between the sides of two adjacent battery cells 21 .

[0316] In some embodiments, the first protrusion 125 may extend to both ends of the first side plate 12 along the second direction Y. In other embodiments, both ends of the first protrusion 125 along the second direction Y may be spaced apart from both ends of the first side plate 12 along the second direction Y.

[0317] The extension length of the first protrusion 125 along the second direction Y can be the same as the length of the battery cell 21 along the second direction Y, or the extension length of the first protrusion 125 along the third direction Z can be greater than the length of the battery cell 21 along the second direction Y, thereby increasing the connection area with the battery cell 21 and improving heat dissipation. Alternatively, the extension length of the first protrusion 125 along the second direction Y can be less than the length of the battery cell 21 along the third direction Z, thereby reserving more space for the first heat conductor 30, thereby improving heat dissipation capability through the first heat conductor 30.

[0318] As shown in Figure 31, the surface of the first protrusion 125 facing the battery cell 21 is a first arc surface 1251. In an embodiment where the battery cell 21 is a soft-pack battery cell and the battery module 20 is not provided with a third heat conductor 27, the two side surfaces of the battery cell 21 located in the first direction X are both arc sides. The surface of the first protrusion 125 facing the battery cell 21 is the first arc surface 1251, which matches a partial area of ​​the arc side surface of the battery cell 21, so that after the first protrusion 125 extends between two adjacent battery cells 21, the first protrusion 125 has as large a contact area as possible with the battery cell 21, and heat can be directly conducted between the battery cell 21 and the first side plate 12, which is beneficial to improving the heat dissipation capacity.

[0319] As shown in FIG32 , in some embodiments, the inner surface 131 of the second side plate is provided with a plurality of second protrusions 135 , which are spaced apart along the third direction Z. Each second protrusion 135 extends along the second direction Y. Along the first direction X, the second protrusion 135 extends between the sides of two adjacent battery cells 21 .

[0320] In some embodiments, the second protrusion 135 may extend to both ends of the second side plate 13 along the second direction Y. In other embodiments, both ends of the second protrusion 135 along the second direction Y may be spaced apart from both ends of the second side plate 13 along the second direction Y, thereby facilitating connection between the first end plate 80 and the second end plate 90 and both ends of the housing 10.

[0321] The extension length of the second protrusion 135 along the second direction Y can be the same as the length of the battery cell 21 along the second direction Y, or the extension length of the second protrusion 135 along the second direction Y can be greater than the length of the battery cell 21 along the second direction Y, thereby increasing the contact area with the battery cell 21 and improving the heat dissipation. Alternatively, the extension length of the second protrusion 135 along the second direction Y can be less than the length of the battery cell 21 along the second direction Y, thereby reserving more space for the second heat conductive member 50, thereby improving the heat dissipation capability of the second heat conductive member 50.

[0322] As shown in Figure 32, the surface of the second protrusion 135 facing the battery cell 21 is a second arc surface 1351. In an embodiment where the battery cell 21 is a soft-pack battery cell and the battery module 20 is not provided with a third heat conductor 27, the two side surfaces of the battery cell 21 located in the first direction X are both arc sides. The surface of the second protrusion 135 facing the battery cell 21 is the second arc surface 1351, which matches a partial area of ​​the arc side surface of the battery cell 21, so that after the second protrusion 135 extends between two adjacent battery cells 21, the second protrusion 135 has as large a contact area as possible with the battery cell 21, and heat can be directly conducted between the battery cell 21 and the second side plate 13, which is conducive to further improving the heat dissipation capacity.

[0323] In an embodiment where the battery module 20 is provided with a third heat conductor 27 , the first protrusion 832 may not be provided on the inner surface 121 of the first side plate, and the second protrusion 932 may not be provided on the inner surface 131 of the second side plate, to facilitate the arrangement of the third heat conductor 27 .

[0324] The number of the first protrusions 125 provided on the first side plate 12 and the number of the second protrusions 135 provided on the second side plate 13 may be the same or different.

[0325] One end of two adjacent battery cells 21 along the first direction X may have a first protrusion 125 extending between the two adjacent battery cells 21 to increase the contact area, thereby improving heat dissipation. The other end of two adjacent battery cells 21 along the first direction X may also have a second protrusion 135 extending between the two adjacent battery cells 21 to further increase the contact area and further improve heat dissipation.

[0326] A first protrusion 125 may be inserted between each pair of adjacent battery cells 21, thereby providing a larger heat dissipation area for each pair of adjacent battery cells 21, thereby improving heat dissipation capability. Alternatively, a first protrusion 125 may be inserted between some pair of adjacent battery cells 21, thereby reducing the number of first protrusions 125 on the first side plate 12 and facilitating processing of the first side plate 12.

[0327] A second protrusion 135 may be inserted between each pair of adjacent battery cells 21, thereby providing a larger heat dissipation area for each pair of adjacent battery cells 21, thereby further improving heat dissipation capability. Alternatively, a second protrusion 135 may be inserted between some pairs of adjacent battery cells 21, thereby reducing the number of first protrusions 125 on the second side plate 13 and facilitating processing of the second side plate 13.

[0328] There are many ways to form the first protrusion 125. For example, the first protrusion 125 and the first side panel 12 can be separately provided, and the first protrusion 125 can be connected to the inner surface 121 of the first side panel by welding, bonding, etc., so that the first protrusion 125 is provided on the inner surface 121 of the first side panel. For another example, the first protrusion 125 can also be formed by stamping the first side panel 12. Similarly, there are many ways to form the second protrusion 135. For example, the second protrusion 135 and the second side panel 13 can be separately provided, and the second protrusion 135 can be connected to the inner surface 131 of the second side panel by welding, bonding, etc., so that the second protrusion 135 is provided on the inner surface 131 of the second side panel. For another example, the second protrusion 135 can also be formed by stamping the second side panel 13.

[0329] As shown in Figures 31 and 32, in some embodiments, a first recessed portion 126 is formed on the outer surface 122 of the first side plate at a position corresponding to the first protrusion 125. A second recessed portion 136 is formed on the outer surface 132 of the second side plate at a position corresponding to the second protrusion 135. The provision of the first recessed portion 126 and the second recessed portion 136 can increase the heat dissipation area of ​​the first side plate 12 and the second side plate 13, thereby improving heat dissipation efficiency.

[0330] The shape of the first recessed portion 126 can be the same as that of the first protruding portion 125, that is, when viewed along the second direction Y, the shape of the first recessed portion 126 is the same as that of the first protruding portion 125. The first recessed portion 126 can be a groove formed using a slotting process. After the first recessed portion 126 is formed, the thickness of the first side panel 12 at the location corresponding to the first recessed portion 126 is less than the thickness at other locations of the first side panel 12. The shape of the second recessed portion 136 can be the same as that of the second protruding portion 135, that is, when viewed along the second direction Y, the shape of the second recessed portion 136 is the same as that of the second protruding portion 135. The second recessed portion 136 can be a groove formed using a slotting process. After the second recessed portion 136 is formed, the thickness of the second side panel 13 at the location corresponding to the second recessed portion 136 is less than the thickness at other locations of the second side panel 13.

[0331] The first recessed portion 126 can also be formed by stamping the first side panel 12. During the stamping process, the outer surface 122 of the first side panel is recessed inward to form the first recessed portion 126, and the inner surface 121 of the first side panel at a position corresponding to the first recessed portion 126 is protruded to form the first protruding portion 125. That is, the first protruding portion 125 and the first recessed portion 126 are stamped and formed. The molding method of the first protruding portion 125 and the first recessed portion 126 is simple. The second recessed portion 136 can also be formed by stamping the second side panel 13. During the stamping process, the outer surface 132 of the second side panel is recessed inward to form the second recessed portion 136, and the inner surface 131 of the second side panel at a position corresponding to the second recessed portion 136 is protruded to form the second protruding portion 135. That is, the second protruding portion 135 and the second recessed portion 136 are stamped and formed. The molding method of the second protruding portion 135 and the second recessed portion 136 is simple.

[0332] The first recessed portion 126 and the first protruding portion 125 may also be cast or injection molded simultaneously when the housing 10 is formed by a casting or injection molding process. Similarly, the second recessed portion 136 and the second protruding portion 135 may also be cast or injection molded simultaneously when the housing 10 is formed by a casting or injection molding process.

[0333] As shown in Figures 33-36, in some embodiments, the first side plate 12 is provided with a first through hole 127. The first through hole 127 extends through the first side plate 12 along a first direction and communicates with a portion of the first space 2310. The first through hole 127 is configured to place a first insulating material in the first space to form a first colloid D1. Optionally, the first colloid D1 is partially located in the first through hole 127.

[0334] In some embodiments, the first insulating material includes foamed glue, and the first insulating material is foamed and solidified to form the first colloid D1.

[0335] In some embodiments, the first insulating material includes a potting compound, and the first insulating material is cured to form a first colloid D1.

[0336] The second side plate 13 is provided with a second through hole 137 , which passes through the second side plate 13 along the first direction and is connected to a portion of the first space, facilitating the flow and inspection of the first insulating material. Optionally, a portion of the first colloid D1 is located in the second through hole 137 .

[0337] In some embodiments, along the first direction X, the projection of the first through hole 127 and the projection of the third through hole 1511 overlap, which is beneficial to the flow of the first insulating material.

[0338] Viewed along the first direction X, both the first through-hole 127 and the second through-hole 137 overlap with the space between the sealing portions 231 of two adjacent battery cells 21. The first colloid D1 is injected into the casing Q through the first through-hole 127 and / or the second through-hole 137. The first colloid D1 fills the space between the sealing portions 231 of two adjacent battery cells 21, improving thermal conductivity between the battery cells 21 and the casing Q. The second through-hole 137 also facilitates ventilation and heat dissipation within the battery pack 100, thereby enhancing the heat dissipation capability of the battery pack 100. Filling the space between the sealing portions 231 of two adjacent battery cells 21 with the first colloid D1 helps alleviate deformation of the two adjacent battery cells 21. Injecting the first colloid D1 into the casing Q also helps improve the airtightness of the battery pack 100.

[0339] The first through hole 127 penetrates the first side plate 12 along the first direction X. When viewed along the first direction X, the first through hole 127 overlaps with the space between the sealing portions 231 of two adjacent battery cells 21. Specifically, when viewed along the first direction X, the first through hole 127 overlaps with the space between the second sealing portions 2312 of two adjacent battery cells 21. Therefore, the first colloid D1 can be injected into the space between the sealing portions 231 of the two adjacent battery cells 21 through the first through hole 127. After the first colloid D1 is injected into the space between the sealing portions 231 of the two adjacent battery cells 21, the foam between the sealing portions 231 of the two adjacent battery cells 21 can be removed.

[0340] The second through hole 137 penetrates the second side plate 13 along the first direction X. When viewed along the first direction X, the second through hole 137 overlaps with the space between the sealing portions 231 of two adjacent battery cells 21. Specifically, when viewed along the first direction X, the second through hole 137 overlaps with the space between the second sealing portions 2312 of two adjacent battery cells 21. Therefore, the first colloid D1 can be injected into the space between the sealing portions 231 of two adjacent battery cells 21 through the second through hole 137. When viewed along the first direction X, the first through hole 127 and the second through hole 137 can overlap.

[0341] Of course, the first colloid D1 can also be injected into the box body Q through the first through hole 127 and the second through hole 137 at the same time, which can improve the efficiency of glue injection.

[0342] If the amount of the first colloid D1 injected from the first through hole 127 or the second through hole 137 is sufficient, the first colloid D1 can completely fill the space between the first end plate 80 and the battery module 20 , and the first colloid D1 can cover the first circuit board 26 to improve the sealing performance.

[0343] A portion of the first colloid D1 is connected to the first circuit board 26 to improve heat dissipation of the first circuit board.

[0344] As shown in Figures 37 and 38, in some embodiments, the first side panel 12 is provided with a first side panel opening 128, which extends through the first side panel 12 along the first direction X. The housing 10 further includes a first heat dissipating fin 130, which covers the first side panel opening 128 and is connected to the first side panel 12. The second side panel 13 is provided with a second side panel opening 138, which extends through the second side panel 13 along the first direction X. The housing 10 further includes a second heat dissipating fin 140, which covers the second side panel opening 138 and is connected to the second side panel 13.

[0345] The first side panel 12 is provided with a first side panel opening 128, the first heat dissipation fin 130 is connected to the first side panel 12 and covers the first side panel opening 128, the second side panel 13 is provided with a second side panel opening 138, the second heat dissipation fin 140 is connected to the second side panel 13 and covers the second side panel opening 138, and the battery module 20 can dissipate heat through the first heat dissipation fin 130 and the second heat dissipation fin 140, thereby further improving the heat dissipation efficiency.

[0346] The first side panel opening 128 can have various shapes, such as a circular hole, a square hole, a rectangular hole, etc. The second side panel opening 138 can have various shapes, such as a circular hole, a square hole, a rectangular hole, etc.

[0347] The first heat dissipating fins 130 are connected to the first side plate 12. There are many ways to connect the first heat dissipating fins 130 and the first side plate 12, such as welding, bolting, and clamping.

[0348] The first heat dissipating fins 130 covering the first side panel openings 128 means that part or all of the first heat dissipating fins 130 are located within the first side panel openings 128 when viewed along the first direction X. The first heat dissipating fin portions 1301 of the first heat dissipating fins 130 are disposed outwardly, away from the battery module 20 along the first direction X. The surfaces of the first heat dissipating fins 130 facing the battery module 20 and the inner surface 121 of the first side panel are coplanar, facilitating the installation of structures within the housing 10.

[0349] The first side panel 12 may be provided with one first side panel opening 128, or may be provided with multiple first side panel openings 128. In embodiments where the first side panel 12 is provided with multiple first side panel openings 128, each first side panel opening 128 may be provided with a corresponding first heat dissipating fin 130. When viewed along the first direction X, the area of ​​the first heat dissipating fin 130 is larger than the area of ​​the first side panel 12 without the first side panel opening 128, thereby ensuring a sufficiently large heat dissipation area and improving heat dissipation capability.

[0350] The second side plate opening 138 may have various shapes, for example, the second side plate opening 138 may be a circular hole, a square hole, a rectangular hole, etc.

[0351] The second heat dissipating fins 140 are connected to the second side plate 13. There are many ways to connect the second heat dissipating fins 140 and the second side plate 13, such as welding, bolting, and clamping.

[0352] The second heat dissipating fins 140 covering the second side panel openings 138 means that, when viewed along the first direction X, part or all of the second heat dissipating fins 140 are located within the second side panel openings 138. The second heat dissipating fin portions 1401 of the second heat dissipating fins 140 are disposed outwardly, away from the battery module 20 along the first direction X. The surfaces of the second heat dissipating fins 140 facing the battery module 20 and the inner surface of the side panel are coplanar, facilitating the installation of structures within the housing 10.

[0353] The second side panel 13 may be provided with one second side panel opening 138, or may be provided with multiple second side panel openings 138. In embodiments where the second side panel 13 is provided with multiple second side panel openings 138, each second side panel opening 138 may be provided with a corresponding second heat dissipating fin 140. When viewed along the first direction X, the area of ​​the second heat dissipating fin 140 is larger than the area of ​​the second side panel 13 without the second side panel opening 138, thereby ensuring a sufficiently large heat dissipation area and improving heat dissipation capability.

[0354] The structures of the first side panel 12 and the second side panel 13 can be the same. For example, the first side panel 12 and the second side panel 13 can both adopt a structure in which a protrusion is provided on the inner surface thereof, or the first side panel 12 and the second side panel 13 can both adopt a structure in which a side panel opening is provided and a heat dissipation fin is provided to cover the side panel opening.

[0355] The structures of the first side plate 12 and the second side plate 13 may also be different. For example, the first side plate 12 has a first protrusion 125 on its inner surface, and the second side plate 13 has a second side plate opening 138 and a second heat dissipation fin 140 covering the second side plate opening 138.

[0356] In an embodiment where the first side panel 12 is provided with a first side panel opening 128 and a first heat dissipation fin 130 is provided to cover the first side panel opening 128, the inner surface of the first side panel 12 in the area not provided with the first side panel opening 128 may also be provided with a first protrusion 125. In an embodiment where the second side panel 13 is provided with a second side panel opening 138 and a second heat dissipation fin is provided to cover the second side panel opening 138, the inner surface of the second side panel 13 in the area not provided with the second side panel opening 138 may also be provided with a second protrusion 135. In this way, the first and second side panels 12 and 13 can dissipate heat not only through the heat dissipation fins but also through contact with the battery cells 21 through the first and second protrusions 125 and 135, further improving heat dissipation efficiency.

[0357] As shown in Figures 2 and 39, in some embodiments, the battery pack 100 also includes a bracket 150, which is located between the box body Q and the cover body 110. The box body Q and the cover body 110 are respectively connected to the bracket 150, and the second circuit board 120 is located between the bracket 150 and the cover body 110.

[0358] The bracket 150 is located between the box body Q and the cover body 110, and the second circuit board 120 is located between the bracket 150 and the cover body 110, which is convenient for installing and fixing the second circuit board 120. The bracket 150 can also act as a partition between the second circuit board 120 and the battery module 20, reducing the risk of interference between the second circuit board 120 and the battery module 20.

[0359] The bracket 150 can be connected to the first end plate 80, the second end plate 90, the housing 10, and the cover 110. The bracket 150 can be detachably connected to the first end plate 80, the second end plate 90, the housing 10, and the cover 110, such as by bolts or screws. For example, as shown in Figures 1 and 39, the bracket 150 is provided with a plurality of tenth threaded holes 1501, part of the tenth threaded holes 1501, the seventh threaded holes 86, and the ninth threaded holes 1101 are coaxially arranged, and the bolts are sequentially passed through the eleventh threaded hole 15071, the seventh threaded hole 86, and the ninth threaded hole 1101 for threaded connection, and another part of the tenth threaded hole 1501, the eighth threaded hole 96, and a part of the ninth threaded hole 1101 are coaxially arranged, and the bolts are sequentially passed through the tenth threaded hole 1501, the eighth threaded hole 96, and the ninth threaded hole 1101 for threaded connection, thereby realizing the connection between the cover 110, the bracket 150, and the two end plates (the first end plate 80 and the second end plate 90).

[0360] In some embodiments, a portion of the bracket 150 is housed within the housing Q, while another portion of the bracket 150 abuts the open end of the housing Q. Along the third direction Z, the bracket 150 has a first surface 1502 and a second surface 1503 disposed opposite each other. The first surface 1502 faces the cover 110, while the second surface 1503 faces the battery module 20. A tenth threaded hole 1501 extends through the first and second surfaces 1502, 1503. The bracket 150 has a protrusion 1504 extending from the second surface 1503 toward the battery module 20. The protrusion 1504 extends from the first opening Q1 into the housing Q. The second surface 1503 abuts the open end of the housing Q. A plurality of tenth threaded holes 1501 are disposed around the protrusion 1504. The protrusion 1504 extends from the first opening Q1 into the housing Q and, together with the bottom plate 11, can retain the battery module 20.

[0361] As shown in Figures 2 and 40-43, in some embodiments, along the third direction Z, a first surface 1502 of the bracket 150 facing the cover 110 is provided with an accommodating portion 1505. The accommodating portion 1505 is recessed from the first surface 1502 in the third direction Z toward the battery module 20, and a protrusion 1504 is formed on a second surface 1503 of the bracket 150 facing away from the cover 110. The second surface 1503 abuts against the open end of the box body Q, and the protrusion 1504 is inserted into the box body Q.

[0362] As shown in Figure 40, crisscrossing reinforcing ribs 1506 are provided within the housing 1505 to increase the strength of the bracket 150. Also provided within the housing 1505 are connecting posts 1507, which are used to secure the second circuit board 120. These posts 1507 extend out of the housing 1505 along the third direction Z. Eleven threaded holes 15071 are provided on these posts, allowing the second circuit board 120 to be connected to the posts 1507 via bolts. Four connecting posts 1507 are provided within the housing 1505, located at the four corners of the rectangle.

[0363] In other embodiments, the bracket 150 may form a receiving portion 1505 only on the first surface 1502, and the bracket 150 is flat on the side facing away from the cover body 110 without forming a protrusion 1504. In this way, the bracket 150 does not occupy the space inside the box body Q, which is beneficial to improving the energy density of the battery pack 100.

[0364] In other embodiments, the bracket 150 may not form the accommodating portion 1505 on the first surface 1502 , and may only form the accommodating portion 1505 on the first surface 1502 , thereby simplifying the structure of the bracket 150 and reducing the difficulty of processing.

[0365] In other embodiments, the bracket 150 may also be a flat plate structure.

[0366] As shown in Figures 43 and 44 , the bracket 150 is further provided with a plurality of twelfth threaded holes 1508. The twelfth threaded holes 1508 can be provided in the convex portion, specifically in the area where the convex portion overlaps with the first side plate 12 and the second side plate 13.

[0367] The first side plate 12 is also provided with a thirteenth threaded hole 129, and the second side plate 13 is also provided with a fourteenth threaded hole 139. Part of the twelfth threaded hole 1508 and the thirteenth threaded hole 129 are coaxially arranged, and the other part of the twelfth threaded hole 1508 is coaxially arranged with the fourteenth threaded hole 139. The bolt is threadedly connected with the twelfth threaded hole 1508 and the thirteenth threaded hole 129 to realize the connection between the first side plate 12 and the bolt is threadedly connected with the fourteenth threaded hole 139 and the twelfth threaded hole 1508, thereby realizing the connection between the bracket 150 and the second side plate 13, and then realizing the connection between the bracket 150 and the shell 10.

[0368] The bracket 150 and the first end plate 80 , the second end plate 90 , the housing 10 , and the cover 110 may also be connected in other ways, such as welding, bonding, etc.

[0369] In some embodiments, the battery module 20 is located between the bracket 150 and the bottom plate 11 , and the bracket 150 is in contact with the battery module 20 .

[0370] The bracket 150 is in contact with the battery module 20 , which helps the bracket 150 and the bottom plate 11 of the shell 10 to jointly limit the battery module 20 , alleviate the problem of movement of the battery module 20 , and improve the safety performance of the battery pack 100 .

[0371] In embodiments where the bracket 150 is formed with a receiving portion 1505 and a protrusion 1504, after the protrusion 1504 is inserted into the case Q, the surface of the protrusion 1504 facing away from the cover 110 contacts the battery module 20. In embodiments where the bracket 150 is formed with a receiving portion 1505 and does not have the protrusion 1504, and in embodiments where the bracket 150 is a flat plate, the second surface 1503 of the bracket 150 facing away from the cover 110 not only abuts against the open end of the case Q but also contacts the battery module 20.

[0372] The bracket 150 contacts the battery module 20 and can apply pressure to the battery module 20. The bracket 150 can apply pressure to the battery module 20 after the battery cells 21 cyclically expand or before the battery cells 21 cyclically expand.

[0373] Of course, in other embodiments, the bracket 150 and the battery module 20 may not be in contact.

[0374] In some embodiments, a third sealing member (not shown) is provided between one end of the box body Q forming the first opening Q1 and the bracket 150 , and the third sealing member connects the open end of the box body Q and the bracket 150 .

[0375] A third sealant is provided between the end of the box body Q forming the first opening Q1 and the bracket 150 , which is beneficial to improving the airtightness of the battery pack 100 , thereby improving the safety performance of the battery pack 100 and extending the service life of the battery pack 100 .

[0376] The third sealing member can be a solid rubber pad. The third sealing member can also be formed by curing the sealant applied between the open end of the box body Q and the bracket 150.

[0377] As shown in Figures 41 and 45, in some embodiments, a third groove 1509 is provided on the side of the bracket 150 facing the box body Q, and the third groove 1509 extends circumferentially along the first opening Q1. One end of the box body Q forming the first opening Q1 is inserted into the third groove 1509, and the third sealing member is accommodated in the third groove 1509.

[0378] A third groove 1509 is provided on the side of the bracket 150 facing the case Q. The end of the case Q forming the first opening Q1 is inserted into the third groove 1509, allowing the case Q and the bracket 150 to be accurately positioned relative to each other. The bracket 150 and the case Q overlap in the direction of the third groove 1509, sharing a portion of space. This reduces the size of the battery pack 100 and facilitates structural miniaturization of the battery pack 100. The third seal is housed in the third groove 1509, facilitating its stable installation.

[0379] The bracket 150 further includes a stopper 1510 on its second surface 1503, which faces the battery module 20. The stopper 1510 protrudes from the second surface 1503 in the third direction Z, toward the battery module 20. The stopper 1510 extends circumferentially along the first opening Q1 of the housing Q and surrounds the outer periphery of the protrusion 1504. The surface of the stopper 1510 facing the protrusion 1504, the second surface 1503, and the outer periphery of the protrusion 1504 collectively define a third groove 1509. The surface of the stopper 1510 facing the protrusion 1504 and the outer periphery of the protrusion 1504 respectively limit the housing Q on the inner and outer sides of the first side panel 12, the inner and outer sides of the second side panel 13, the inner and outer sides of the first end panel 80, and the inner and outer sides of the second end panel 90.

[0380] The third sealing member may be partially or completely accommodated in the third groove 1509 .

[0381] The third sealing member may be a solid rubber pad or may be formed by curing a liquid sealant applied to the third groove 1509 .

[0382] As shown in Figures 40, 41, and 42, in some embodiments, the bracket 150 is provided with a third through hole 1511. The third through hole 1511 is configured to allow a second insulating material to be injected into the box Q and cured to form the second colloid D2. Optionally, the second insulating material includes foamed glue. Optionally, the second insulating material includes potting glue.

[0383] The second colloid D2 is injected into the casing Q through the third through-hole 1511. The second colloid D2 fills any accessible gaps within the casing Q, thereby improving the airtightness of the casing Q. The second colloid D2 also enhances thermal conductivity between the battery module 20 and the casing Q, thereby improving the heat dissipation capability of the battery pack 100. The second colloid D2 filling the casing Q helps alleviate the problem of battery module 20 movement, thereby improving the safety performance of the battery pack 100.

[0384] Along the third direction Z, the third through hole 1511 passes through the bracket 150 and communicates with the accommodating space of the box body Q. The second colloid D2 is injected into the box body Q through the third through hole 1511 to fill the space inside the box body Q.

[0385] The second colloid D2 can be a colloid with good thermal conductivity. After solidification, the second colloid D2 can also play a connecting role in the box Q, thereby improving the installation stability of various structures in the box Q.

[0386] In some embodiments, the amount of the second colloid D2 injected into the box body Q through the third through hole 1511 should be such that it does not overflow from the third through hole 1511 .

[0387] In some embodiments, the bracket 150 is provided with two third through holes 1511, and the two third through holes 1511 are arranged at intervals along the second direction Y; when viewed along the third direction Z, the space between the first end plate 80 and the battery module 20 overlaps with one of the two third through holes 1511, and the space between the second end plate 90 and the battery module 20 overlaps with the other of the two third through holes 1511.

[0388] When viewed in the third direction Z, the space between the first end plate 80 and the battery module 20 overlaps with one third through hole 1511, and the space between the second end plate 90 and the battery module 20 overlaps with another third through hole 1511. Glue can be poured into the space between the first end plate 80 and the battery module 20 and the space between the second end plate 90 and the battery module 20 through the corresponding third through holes 1511, which can improve the efficiency of glue pouring and facilitate the uniform distribution of the second colloid D2 in the box Q.

[0389] In some embodiments, along the third direction Z, the projection of the third through hole 1511 is separated from the projection of the electrode assembly, which limits the second insulating material from being coated onto the packaging body 232 and reduces the effect of the second colloid D2 on the expansion of the battery cell 21 .

[0390] As shown in FIG. 46 to FIG. 49 , in some embodiments, the bracket 150 is provided with two third through holes 1511 , and the two third through holes 1511 are arranged at intervals along the third direction Z.

[0391] When viewed along the third direction Z, one of the two third through holes 1511 overlaps with the space between the first end plate 80 and the battery module 20 (shown in FIG. 48 ), and the other of the two third through holes 1511 overlaps with the space between the second end plate 90 and the battery module 20 (shown in FIG. 49 ). The second colloid D2 can be injected into the space between the first end plate 80 and the battery module 20, and into the space between the second end plate 90 and the battery module 20, respectively, through the two third through holes 1511.

[0392] In an embodiment in which the first side plate 12 is provided with the first through hole 127 and the second side plate 13 is provided with the second through hole 137, the third through hole 1511 may not be provided on the bracket 150. The first colloid D1 is filled between the first end plate 80 and the battery module 20 and between the second end plate 90 and the battery module 20 only through the second through hole 137, thereby simplifying the structure of the bracket 150.

[0393] In an embodiment in which the bracket 150 is provided with the third through hole 1511, the first through hole 127 may not be provided on the first side panel 12, and the second through hole 137 may not be provided on the second side panel 13. The second colloid D2 is injected into the box body Q only through the third through hole 1511, thereby simplifying the structures of the first side panel 12 and the second side panel 13.

[0394] Of course, the first through hole 127 can be set on the first side panel 12, the second through hole 137 can be set on the second side panel 13, and the third through hole 1511 can be set on the bracket 150. The second through hole 137 and the third through hole 1511 can be used to inject glue into the box body Q simultaneously, which can improve the glue injection efficiency.

[0395] In the present application, the first colloid D1 and the second colloid D2 may be made of the same material or different materials. The first colloid D1 and the second colloid D2 may be insulating glue.

[0396] In some embodiments, a fourth sealing member (not shown) is provided between the cover 110 and the bracket 150 .

[0397] A third sealing member is provided between the cover 110 and the bracket 150 , which is beneficial to improving the airtightness of the battery pack 100 , thereby improving the safety performance of the battery pack 100 and extending the service life of the battery pack 100 .

[0398] The fourth sealing member can be a solid rubber pad. Alternatively, the fourth sealing member can be formed by curing a sealant applied between the cover 110 and the bracket 150. As shown in Figures 30 and 50, in some embodiments, a fourth groove 1102 is provided on the side of the cover 110 facing the bracket 150. The fourth groove 1102 extends circumferentially around the first opening Q1, and at least a portion of the fourth sealing member is received within the fourth groove 1102.

[0399] A fourth groove 1102 is provided on the side of the cover body 110 facing the bracket 150. At least a portion of the fourth seal is accommodated in the fourth groove 1102. The fourth seal and the cover body 110 share a portion of space, which is beneficial to reducing the volume of the battery pack 100, thereby facilitating the miniaturization of the battery pack 100 structure.

[0400] The fourth groove 1102 is a closed structure that is circumferentially closed around the first opening Q1 of the housing Q. The fourth sealing member is received within the fourth groove 1102, i.e., the fourth sealing member is embedded within the fourth groove 1102. The fourth sealing member may be fully or partially received within the fourth groove 1102.

[0401] The embodiments of the present application also provide an electrical device, which includes an electrical main body and the battery pack 100 provided in any of the above embodiments. Electrical devices include but are not limited to energy storage systems, electric vehicles, power tools, drones, etc. The battery pack 100 is used to provide electrical energy to the electrical main body. The battery pack 100 provided in any of the above embodiments has good heat dissipation capability and high heat dissipation efficiency, so that the safety performance of the battery pack 100 is relatively high, and can meet the electrical operating conditions of the electrical equipment with high rate, no static, and continuous charging and discharging, and is also beneficial to improving the electrical safety of the electrical equipment equipped with the battery pack 100.

[0402] As shown in FIG51 , an embodiment of the present application further provides a method for manufacturing the aforementioned battery pack 100 . The method for manufacturing the battery pack 100 includes:

[0403] S100, providing a housing 10, applying an external force to the housing 10 to deform the first side plate 12 and the second side plate 13 in a direction away from each other;

[0404] S300, providing a battery module 20 and a first heat conducting member 30, and disposing the first heat conducting member 30 on the first side plate 12 or the battery module 20;

[0405] S400, placing the battery module 20 between the first side plate 12 and the second side plate 13, which are spaced apart from each other, in a direction perpendicular to the bottom plate 11;

[0406] S500 , removing the external force to restore the first side plate 12 and the second side plate 13 to their original positions.

[0407] In S100 , a force is applied to the first side plate 12 and the second side plate 13 to separate from each other, and the distance between the first side plate 12 and the second side plate 13 gradually increases in a direction away from the bottom plate 11 , forming a larger first open end.

[0408] The first heat conducting member 30 may be a liquid heat conducting adhesive coated on the inner surface 121 of the first side plate, or a solid heat conducting adhesive fixed to the inner surface 121 of the first side plate. Alternatively, the first heat conducting member 30 may be a liquid heat conducting adhesive coated on the battery module 20, or a solid heat conducting adhesive fixed to the battery module 20.

[0409] Before executing S400 , a second heat conducting member 50 may be provided and disposed on the second side plate 13 or the battery module 20 .

[0410] The second heat conducting member 50 may be a liquid heat conducting adhesive coated on the inner surface 131 of the second side plate, or a solid heat conducting adhesive fixed to the inner surface 131 of the second side plate. Alternatively, the second heat conducting member 50 may be a liquid heat conducting adhesive coated on the battery module 20, or a solid heat conducting adhesive fixed to the battery module 20.

[0411] After the external force is removed, the first side plate 12 and the second side plate 13 are reset, squeezing the first thermally conductive member 30 disposed between the first side plate 12 and the battery module 20, and squeezing the second thermally conductive member 50 between the second side plate 13 and the battery module 20. In embodiments where the first thermally conductive member 30 is a liquid thermally conductive adhesive coated on the inner surface 121 of the first side plate or on the battery module 20, the liquid thermally conductive adhesive will be squeezed during the reset of the first side plate 12, facilitating diffusion of the liquid thermally conductive adhesive between the first side plate 12 and the battery module 20. Similarly, in embodiments where the second thermally conductive member 50 is a liquid thermally conductive adhesive coated on the inner surface 131 of the second side plate or on the battery module 20, the liquid thermally conductive adhesive will be squeezed during the reset of the second side plate 13, facilitating diffusion of the liquid thermally conductive adhesive between the second side plate 13 and the battery module 20.

[0412] The first heat conducting member 30 is arranged on the first side plate 12 or the battery module 20 , and the second heat conducting member 50 is arranged on the second side plate 13 or the battery module 20 , either before or after external force is applied to the shell 10 .

[0413] As shown in FIG52 , when an external force is applied to the housing 10, the first side panel 12 and the second side panel 13 are deformed in a direction away from each other. The first side panel 12 and the second side panel 13 shown in solid lines in FIG50 are the first side panel 12 and the second side panel 13 before the external force is applied, and the first side panel 12 and the second side panel 13 shown in dotted lines are the first side panel 12 and the second side panel 13 after the external force is applied. The first side panel 12 and the second side panel 13 are cantilever beams relative to the bottom panel 11.

[0414] By applying external force to the shell 10 so that the first side plate 12 and the second side plate 13 are deformed in the directions away from each other, a larger opening is formed at the end of the shell 10 away from the bottom plate 11, providing space for the clamp to clamp the battery module 20 and enter the shell 10. After the external force is removed, the first side plate 12 and the second side plate 13 are reset, and the distance between the first side plate 12 and the battery module 20, as well as the distance between the second side plate 13 and the battery module 20 can be very small, which can shorten the heat conduction path between the battery module 20 and the first side plate 12 of the shell 10 and between the battery module 20 and the second side plate 13, thereby improving the heat dissipation capacity of the battery pack 100.

[0415] In some embodiments, after the external force is removed, the manufacturing method of the battery pack 100 further includes:

[0416] S600, providing two end plates, and fixing the two end plates to both ends of the first side plate 12 and the second side plate 13, so that the housing 10 and the two end plates form a box body Q having a first opening Q1, and the first opening Q1 is opposite to the bottom plate 11;

[0417] S700 , providing a cover 110 , which covers the first opening Q1 .

[0418] The housing 10 , the two end plates and the cover 110 together define a space for accommodating the battery module 20 , thereby providing better protection for the battery module 20 .

[0419] After the external force is removed, the two end plates are connected to both ends of the first side plate 12 and the second side plate 13 , and the cover 110 is used to cover the first opening Q1 of the box body Q, which is beneficial to improving the airtightness of the battery pack 100 .

[0420] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery pack, include: A shell, which is U-shaped, comprises a bottom plate, a first side plate and a second side plate, wherein the first side plate and the second side plate are arranged opposite to each other along a first direction, and the bottom plate connects the first side plate and the second side plate; A battery module is located between the first side plate and the second side plate, the battery module includes a plurality of battery cells, and along the first direction, there is a first gap between the first side plate and the battery module; A first heat-conducting member, disposed in the first gap, wherein the battery module and the first side plate are connected via the first heat-conducting member; The first side plate and the second side plate are configured to move away from each other under the action of an external force so as to place the battery module in the housing.

2. The battery pack according to claim 1, in, The battery pack further includes a first end plate and a second end plate, wherein the first end plate and the second end plate are arranged along a second direction; The first side plate and the second side plate are both fixedly connected to the first end plate, and the first side plate and the second side plate are both fixedly connected to the second end plate. The first end plate, the second end plate and the shell form a box body with a first opening, and the first opening is opposite to the bottom plate. The battery module is accommodated in the box body.

3. The battery pack according to claim 1 or 2, in, Along the first direction, the length of the first gap is 0.05 mm to 2.5 mm.

4. The battery pack according to claim 3, in, Along the first direction, the length of the first gap is 0.1 mm to 1.9 mm.

5. The battery pack according to claim 4, in, Along the first direction, the length of the first gap is 0.1 mm to 1.4 mm.

6. The battery pack according to any one of claims 1 to 5, in, There is a second gap (A2) between the second side plate and the battery module; The battery pack (100) further comprises a second heat conducting member (50), wherein the second heat conducting member (50) is arranged in the second gap (A2).

7. The battery pack according to claim 6, in, Along the first direction, the length of the second gap is 0.05 mm to 2.5 mm.

8. The battery pack according to claim 7, in, Along the first direction, the length of the second gap is 0.1 mm to 1.9 mm.

9. The battery pack according to claim 8, in, Along the first direction, the length of the second gap is 0.1 mm to 1.4 mm.

10. The battery pack according to any one of claims 1 to 9, in, The bottom plate, the first side plate and the second side plate are integrally formed.

11. The battery pack according to any one of claims 1 to 10, in, The first side plate is provided with a plurality of first protrusions, and the first protrusions extend between the side portions of two adjacent battery cells; The second side plate is provided with a plurality of second protrusions, and the second protrusions extend between the side portions of two adjacent battery cells.

12. The battery pack according to any one of claims 1 to 11, in, The first side plate is provided with a first side plate opening, the first side plate opening penetrates the first side plate along the first direction, the housing further comprises a first heat dissipation fin, the first heat dissipation fin covers the first side plate opening and is connected to the first side plate; The second side plate is provided with a second side plate opening, and the second side plate opening penetrates the second side plate along the first direction. The housing further includes a second heat dissipation fin, and the second heat dissipation fin covers the second side plate opening and is connected to the second side plate.

13. The battery pack according to claim 2, in, The housing is provided with a first reinforcement and a second reinforcement at both ends in the second direction.

14. The battery pack according to claim 13, in, The first reinforcement member is U-shaped, the first reinforcement member is fixedly connected to the outer surface of the shell, the first reinforcement member is fixedly connected to the first end plate, and the first reinforcement member is fixedly connected to the second end plate; The second reinforcement is U-shaped, the second reinforcement is fixedly connected to the outer surface of the shell, the second reinforcement is fixedly connected to the first end plate, and the second reinforcement is fixedly connected to the second end plate.

15. The battery pack according to claim 13 or 14, in, The first reinforcement member is provided with a first clamping groove, the first end plate comprises a first end plate body and a first clamping portion, the first clamping portion is provided at an edge of the first end plate body, and the first clamping portion is clamped in the first clamping groove; The second reinforcement is provided with a second clamping groove, the second end plate includes a second end plate body and a second clamping portion, the second clamping portion is provided at an edge of the second end plate body, and the second clamping portion is clamped in the second clamping groove.

16. The battery pack according to claim 15, in, The first clamping portion includes a first limit plate and a first convex portion, the first limit plate is connected to the first end plate body, the first convex portion is convexly arranged on the surface of the first limit plate facing the first reinforcement member and is clamped in the first clamping groove; The second clamping portion includes a second limiting plate and a second protrusion. The second limiting plate is connected to the second end plate body and is located on the side of the second reinforcement member away from the battery module along the first direction. The second protrusion is protruding from the surface of the second limiting plate facing the second reinforcement member and is clamped in the second clamping groove.

17. The battery pack according to claim 2, in, A first sealing member is provided between one end of the housing in the second direction and the first end plate; A second seal is disposed between the other end portion of the housing in the second direction and the second end plate.

18. The battery pack according to claim 17, in, A first groove is formed on a surface of the first end plate facing the housing, the first groove is arranged along an edge of the first end plate, and the first sealing member is arranged in the first groove; A second groove is formed on a surface of the second end plate facing the housing. The second groove is arranged along an edge of the second end plate. The second sealing member is arranged in the second groove.

19. The battery pack according to claim 2, in, The battery cell comprises an electrode assembly, a packaging bag and a tab connected to the electrode assembly, the packaging bag has a sealing portion, the tab extends out of the packaging bag from the sealing portion, and a first space exists between the sealing portions of two adjacent battery cells; The first side plate is provided with a first through hole, the first through hole penetrates the first side plate along the first direction, and the first through hole is connected with a part of the first space; The battery pack further includes a first colloid at least partially disposed in the first space, and the first through hole is configured to dispose a first insulating material in the first space to form the first colloid.

20. The battery pack according to claim 19, in, The battery module further includes a first circuit board, the tab is connected to the first circuit board, and the first circuit board and the packaging bag are arranged along a second direction; The first colloid portion is connected with the first circuit board.

21. The battery pack according to claim 2, in, The battery pack further includes a cover body, the cover body covering the first opening; The battery pack further includes a second circuit board, which is located on a side of the battery module away from the bottom plate.

22. The battery pack according to claim 21, in, The battery pack further includes a bracket, wherein the bracket is located between the box body and the cover body, the box body and the cover body are respectively connected to the bracket, and the second circuit board is located between the bracket and the cover body.

23. The battery pack according to claim 22, in, The battery module is located between the bracket and the bottom plate, and the bracket is connected to the battery module.

24. The battery pack according to claim 22 or 23, in, The bracket is provided with a third through hole, and the third through hole is configured to inject a second insulating material into the box body to form a second colloid.

25. The battery pack according to claim 24, in, The bracket is provided with two third through holes, and the two third through holes are arranged at intervals along the second direction; Observing along the third direction, the space between the first end plate and the battery module overlaps with one of the two third through holes, and the space between the second end plate and the battery module overlaps with the other of the two third through holes. The first direction, the second direction and the third direction are perpendicular to each other.

26. The battery pack according to any one of claims 22 to 25, in, A third sealing member is disposed between one end of the box body forming the first opening and the bracket.

27. The battery pack according to claim 26, in, A third groove is provided on one side of the bracket facing the box body. The third groove extends along the circumference of the first opening. One end of the box body forming the first opening is inserted into the third groove. The third sealing member is accommodated in the third groove.

28. The battery pack according to any one of claims 22 to 27, in, A fourth sealing member is provided between the cover body and the bracket.

29. The battery pack according to claim 28, in, A fourth groove is provided on a side of the cover body facing the bracket. The fourth groove extends along the circumference of the first opening. At least a portion of the fourth sealing member is received in the fourth groove.

30. The battery pack according to claim 19, in, A portion of the first colloid is located in the first through hole.

31. The battery pack according to claim 19, in, The second side plate is provided with a second through hole. The second through hole penetrates the second side plate along the first direction, and the second through hole is communicated with the first space.

32. The battery pack according to claim 31, in, A portion of the first colloid is located in the second through hole.

33. The battery pack according to claim 32, in, Along the first direction, the projection of the first through hole overlaps with the projection of the second through hole.

34. The battery pack according to any one of claims 1 to 33, in, The battery cell comprises a packaging bag and a tab, the packaging bag has a sealing portion, the tab extends out of the packaging bag from the sealing portion in a second direction, the plurality of battery cells are stacked along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; The battery module package also includes a third heat conductor, a portion of which is arranged between two adjacent battery cells, and along the first direction, a portion of the third heat conductor extends to the space between the first side plate and the multiple battery cells, and a portion of the third heat conductor extends to the space between the second side plate and the multiple battery cells.

35. The battery pack according to claim 34, in, Along the first direction, the length of the first gap is 0.05 mm to 1.5 mm.

36. The battery pack according to claim 35, in, Along the first direction, the length of the first gap is 0.1 mm to 1.1 mm.

37. The battery pack according to claim 36, in, Along the first direction, the length of the first gap is 0.1 mm to 0.6 mm.

38. The battery pack according to any one of claims 34 to 37, in, A second gap exists between the second side plate and the battery module. Along the first direction, a length of the first gap is 0.05 mm to 1.5 mm.

39. The battery pack according to claim 38, in, Along the first direction, the length of the second gap is 0.1 mm to 1.1 mm.

40. The battery pack according to claim 39, in, Along the first direction, the length of the second gap is 0.1 mm to 0.6 mm.

41. An electrical device, in, Comprising a battery pack according to any one of claims 1-40.

42. A method for manufacturing a battery pack, in, include: Providing a shell, wherein the shell is U-shaped, and comprises a first side plate and a second side plate that are oppositely arranged, and a bottom plate connecting the first side plate and the second side plate; Applying an external force to the housing to deform the first side plate and the second side plate in directions away from each other; Providing a battery module and a first heat-conducting member, and arranging the first heat-conducting member on the first side plate or the battery module; Place the battery module between the first side plate and the second side plate which are away from each other in a direction perpendicular to the bottom plate; The external force is removed to restore the first side plate and the second side plate.

43. The method for manufacturing a battery pack according to claim 42, in, After the external force is removed, the manufacturing method of the battery pack further comprises: Providing two end plates, connecting the two end plates to the two ends of the first side plate and the second side plate, so that the shell and the two end plates form a box body with a first opening, and the opening is opposite to the bottom plate; A cover is provided to cover the first opening.

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