Battery pack and electric device

Abstract

The embodiment of the utility model relates to the technical field of batteries, and discloses a battery pack and a power utilization device, the battery pack has a first direction, and the battery pack comprises an accommodating box body with an accommodating cavity; the plurality of single batteries are arranged in the accommodating cavity, and each single battery is provided with a first anti-explosion valve; the top cover unit comprises a top cover and a reinforcing piece, the top cover is arranged on one side of the accommodating box body in the first direction, and at least part of the reinforcing piece is arranged on one side, close to the single battery, of the top cover in the first direction; an exhaust groove is formed in the top cover, and a groove opening of the exhaust groove is opposite to the first anti-explosion valve. According to the battery pack, the overall strength of the top cover unit is effectively improved, large-scale deformation of the top cover unit when the top cover unit is stressed is avoided, connection failure of the top cover unit and an external connecting element is avoided, meanwhile, gas in the battery pack is efficiently exhausted in time, the internal air pressure of the battery pack is effectively reduced, and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] With the rapid development of mobile phones, laptops, electric vehicles, power tools, and other devices, battery packs with high capacity, long cycle life, and high safety performance have been widely used and developed. At the same time, there is an urgent demand for battery packs with larger capacity, longer durability, and higher safety. Safety performance is the core performance of battery packs. Therefore, how to improve the safety performance of battery packs has become a pressing issue. Utility Model Content

[0003] Embodiments of the present application provide a battery pack and an electrical device to improve the safety performance of the battery pack.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a battery pack is provided having a first orientation, comprising:

[0006] The accommodating box is provided with an accommodating cavity with an open opening;

[0007] A plurality of single cells, each of which is disposed in a receiving cavity, and each of which has a first explosion-proof valve, and the first explosion-proof valve is disposed on a side of the single cell that is open to the receiving cavity; and

[0008] A top cover unit, comprising: a top cover and a reinforcement member, wherein the top cover covers the opening of the accommodating cavity, and at least part of the reinforcement member is connected to a side of the top cover close to the single battery in the first direction;

[0009] An exhaust groove is provided on the top cover, and at least part of the reinforcement is arranged in the exhaust groove, and the notch of the exhaust groove is arranged opposite to the first explosion-proof valve, so that the thermal runaway gas generated by the single battery can enter the exhaust groove through the first explosion-proof valve and be discharged out of the containing box.

[0010] In addition to or as an alternative to one or more of the features disclosed above, the battery pack further has a second direction intersecting the first direction;

[0011] The accommodating box further comprises an exhaust cavity, the exhaust cavity being located on one side of the accommodating cavity in the second direction, and the exhaust cavity being separated from the accommodating cavity;

[0012] An exhaust port is provided on the housing body, the exhaust groove is communicated with the exhaust cavity, and the exhaust port is communicated with the exhaust cavity;

[0013] The battery pack also includes: a second explosion-proof valve, which is arranged at the exhaust port, and the second explosion-proof valve is used to seal the exhaust port.

[0014] In addition to or as an alternative to one or more of the features disclosed above, the top cover includes: a main body portion and a first protrusion portion connected together;

[0015] Along the first direction, the surface of the main body away from the single battery is convex toward the side away from the single battery to form a first convex portion, and the surface of the main body close to the single battery is concave toward the side away from the single battery to form an exhaust groove;

[0016] The reinforcement is connected to a side of the main body portion close to the single battery in the first direction, and the reinforcement is connected to the first protrusion.

[0017] In addition to or as an alternative to one or more features disclosed above, the battery pack further has a second direction and a third direction intersecting the first direction in pairs;

[0018] There are multiple first protrusions and exhaust grooves, all of which extend along the second direction and are arranged at intervals in the third direction. The reinforcement is connected to the multiple first protrusions.

[0019] In addition to or as an alternative to one or more of the features disclosed above, the present invention further comprises: an insulating spacer disposed between the top cover and the single battery, and at least a portion of the reinforcing member disposed between the top cover and the insulating spacer;

[0020] A plurality of exhaust holes are provided on the insulating isolation piece, each exhaust hole is arranged opposite to a first explosion-proof valve, and each exhaust hole is communicated with the exhaust groove.

[0021] In addition to or as an alternative to one or more of the features disclosed above, the battery pack further has a third direction intersecting the first direction;

[0022] The top cover also includes a second convex portion, and a receiving groove is formed on the main body;

[0023] The second protrusion and the accommodating groove both extend along the third direction, the second protrusion is connected to the first protrusion, and the accommodating groove is connected to the exhaust groove, the main body is convex away from the surface of the single cell and away from the single cell to form the second protrusion, and the surface of the main body close to the single cell is recessed toward the side away from the single cell to form the accommodating groove, and at least part of the reinforcement is accommodated in the accommodating groove.

[0024] In addition to or as an alternative to one or more of the features disclosed above, the reinforcement member includes: a reinforcement portion, a raised portion, and a connecting portion;

[0025] The reinforcing portion is arranged in the accommodating groove, the protruding portion is arranged in the exhaust groove, and the reinforcing portion protrudes away from the surface of the single cell toward the side away from the single cell to form a protruding portion; along the first direction, one end of the connecting portion is connected to the protruding portion, and the other end is passed through the top cover for connection with external components.

[0026] In addition to or as an alternative to one or more of the features disclosed above, the single cell includes: a housing, a first end cover, a second end cover, and a terminal;

[0027] The first end cover and the second end cover are respectively arranged at two opposite ends of the shell in the first direction. The first end cover is arranged close to the top cover relative to the second end cover. The first explosion-proof valve is arranged on the first end cover, and the pole is arranged on the second end cover.

[0028] In addition to or as an alternative to one or more of the features disclosed above, the battery pack further has a third direction intersecting the first direction, and a reference plane perpendicular to the first direction;

[0029] The orthographic projection of the reinforcement member on the reference plane at least partially overlaps with the orthographic projections of the first end covers of two adjacent single batteries on the reference plane.

[0030] On the other hand, an electrical device is further disclosed. In addition to or instead of one or more of the features disclosed above, the electrical device includes an electrical body, a battery pack such as any of the above items, and a connecting beam. The battery pack is connected to the electrical body via the connecting beam, and the battery pack is used as a power supply for the electrical device.

[0031] One of the above technical solutions has the following advantages or beneficial effects: the present application connects at least part of the reinforcement to the side of the top cover close to the single cell in the first direction, that is, connects at least part of the reinforcement to the side of the top cover close to the single cell, the reinforcement provides a certain supporting strength for the top cover, effectively improves the overall strength of the top cover unit, avoids large-scale deformation of the top cover unit when subjected to force, avoids failure of the connection between the top cover unit and the external connecting elements, and ensures the reliability and safety of the battery pack; at the same time, in the present application, an exhaust groove is provided on the top cover, and the notch of the exhaust groove is arranged opposite to the first explosion-proof valve. When the single cell has thermal runaway, the high-temperature and high-pressure gas (thermal runaway gas) generated inside the single cell can be ejected from the first explosion-proof valve. The thermal runaway gas is discharged from the exhaust groove to the external space of the battery pack, avoiding the gas ejected during thermal runaway of the single cell to damage other single cells, and timely and efficiently discharges the gas in the battery pack, effectively reducing the internal air pressure of the battery pack and improving the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0033] Figure 1 This is a three-dimensional structural view of a battery pack and a connecting beam provided according to an embodiment of the present application;

[0034] Figure 2 is an exploded structural diagram of a battery pack and a connecting beam provided according to an embodiment of the present application;

[0035] Figure 3 is a three-dimensional structural view of a battery pack provided according to an embodiment of the present application;

[0036] Figure 4 is a top view of a battery pack provided according to an embodiment of the present application;

[0037] Figure 5 is a partial cross-sectional view of a battery pack along the AA direction according to an embodiment of the present application;

[0038] Figure 6 yes Figure 5 A partial enlarged view of point C in the middle;

[0039] Figure 7 is a cross-sectional view of a battery pack along direction BB according to an embodiment of the present application;

[0040] Figure 8 yes Figure 7 A partial enlarged view of point D in the middle;

[0041] Figure 9 is a three-dimensional structural view of a single cell provided according to an embodiment of the present application;

[0042] Figure 10 is a three-dimensional structural view of a single cell provided in accordance with an embodiment of the present application from another perspective;

[0043] Figure 11 This is a structural diagram of an electrical device provided according to an embodiment of the present application.

[0044] Description of reference numerals:

[0045] 100. Battery pack;

[0046] 110, containing box; 111, containing chamber; 112, exhaust chamber; 113, exhaust port;

[0047] 120, single battery; 121, first explosion-proof valve; 122, housing; 1221, first side wall; 1222, second side wall; 123, first end cover; 124, second end cover; 125, pole;

[0048] 130. Top cover unit; 131. Top cover; 1311. Main body; 1312. First protrusion; 1313. Exhaust groove; 1314. Second protrusion; 1315. Accommodation groove; 132. Reinforcement member; 1321. Reinforcement portion; 1322. Protrusion; 1323. Connecting portion;

[0049] 140. Second explosion-proof valve;

[0050] 150. Insulation spacer; 151. Exhaust hole;

[0051] 200. Electricity-consuming entity;

[0052] 300, connecting beam;

[0053] 400. Seals. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and beneficial effects of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for the purpose of explaining this application and are not intended to limit this application.

[0055] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] The top cover of existing battery packs is a single-layer, thin-walled structure. A reinforcement plate is located between the top cover and the connecting beam of the electrical device and is connected to the top cover. The reinforcement plate is provided with a protrusion to accommodate the assembly parts. The assembly parts are placed on the side away from the protrusion to connect to the connecting beam. This results in a lack of rigidity in the top cover, causing excessive deformation of the battery pack when subjected to impact, affecting the battery pack's safety performance. Furthermore, the battery pack adopts an upright bottom-mounted exhaust design. Due to the limited space in the battery pack, electrical connections and sampling require a large space, leaving less room for exhaust, resulting in poor exhaust efficiency, further affecting the battery pack's safety performance.

[0059] In the examples of this application, refer to Figures 1 to 10 The present application provides a battery pack 100, which has a first direction Z, a second direction X, a third direction Y, and a reference plane P perpendicular to the first direction Z. Exemplarily, the battery pack 100 has a first direction Z, a second direction X, a third direction Y, and a reference plane P perpendicular to the first direction Z, which are perpendicular to each other. "Perpendicular" refers to a state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0060] Specifically, refer to Figures 1 to 5 The battery pack 100 includes a container 110 , single cells 120 and a top cover unit 130 .

[0061] Specifically, the housing 110 is provided with an open accommodating cavity 111, and the accommodating cavity 111 is provided to provide accommodating space for the single battery 120; multiple single battery cells 120 are all arranged in the accommodating cavity 111, and the multiple single battery cells 120 are arranged along the second direction X to form a battery pack, and the single battery cells 120 have a first explosion-proof valve 121, and the first explosion-proof valve 121 is provided on the side of the single battery cells 120 facing the opening of the accommodating cavity 111; the top cover unit 130 includes: a top cover 131 and a reinforcement 132, the top cover 131 is provided to cover the opening of the accommodating cavity 111, at least part of the reinforcement 132 is connected to the side of the top cover 131 close to the single battery cells 120 in the first direction Z, that is, at least part of the reinforcement 132 is provided between the top cover 131 and the single battery cells 120, and at least part of the reinforcement 132 abuts against the side of the top cover 131 close to the single battery cells 120 in the first direction Z.

[0062] Specifically, an exhaust groove 1313 is provided on the top cover 131, and at least part of the reinforcement 132 is arranged in the exhaust groove 1313, and the notch of the exhaust groove 1313 is arranged opposite to the first explosion-proof valve 121, so that the thermal runaway gas generated by the single battery 120 can enter the exhaust groove 1313 through the first explosion-proof valve 121 and be discharged outside the containing box 110.

[0063] The battery pack 100 may comprise three layers: single cells 120, battery modules, and battery packs. Specifically, the single cells are grouped into battery modules, which are then placed within the battery pack housing 100 to form the battery pack. Alternatively, the battery pack 100 may comprise two layers: single cells 120 and battery packs. Specifically, the single cells 120 are placed directly within the housing 110 to form the battery pack. This is not specifically limited in this application and may be configured based on actual circumstances, as long as it does not affect the effectiveness of this application.

[0064] The receiving box 110 is made of ordinary steel or aluminum, but is not limited thereto.

[0065] The single cell 120 may be a secondary battery, which refers to a single cell that can be recharged to activate the active material after discharge and continue to be used. For example, the single cell 120 may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, or a nickel-cadmium battery, but is not limited thereto.

[0066] The single battery 120 may be a cylindrical battery, a prismatic battery, a soft-pack battery, or a battery of other shapes.

[0067] The single cell 120 may include an electrode assembly, an electrolyte, a shell, an end cap, a pole and other functional components. The electrolyte may be a conventional electrolyte or a special electrolyte with additives added, and the electrolyte is used to soak the electrode assembly. Among them, the electrode assembly is the component where the electrochemical reaction occurs in the single cell 120, and there may be one or more electrode assemblies. The electrode assembly is mainly formed by stacking or winding a positive electrode sheet, a separator and a negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the electrode body, and the parts of the positive electrode sheet and the negative electrode sheet without active substances each constitute a tab. During the charge and discharge process of the single cell 120, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the tab is electrically connected to the pole to form a current loop, so that the single cell 120 can be used normally.

[0068] The top cover 131 and the reinforcement 132 are both made of metal, but are not limited thereto.

[0069] It can be understood that the present application connects at least part of the reinforcement 132 to the side of the top cover 131 close to the single cell 120 in the first direction Z, that is, at least part of the reinforcement 132 is arranged between the top cover 131 and the single cell 120, and at least part of the reinforcement 132 is connected to the side of the top cover 131 close to the single cell 120 in the first direction Z. The reinforcement 132 provides a certain supporting strength for the top cover 131, effectively improves the overall strength of the top cover unit 130, avoids large-scale deformation of the top cover unit 130 when subjected to force, avoids failure of the connection between the top cover unit 130 and the external connecting elements, and ensures the reliability and safety of the battery pack 100.

[0070] At the same time, in the present application, an exhaust groove 1313 is opened on the top cover 131, and the notch of the exhaust groove 1313 is arranged opposite to the first explosion-proof valve 121. When the single cell 120 has thermal runaway, the high-temperature and high-pressure gas generated inside the single cell 120 can be ejected from the first explosion-proof valve 121, and the gas is discharged from the exhaust groove 1313 to the external space of the battery pack 100, so as to avoid the gas ejected when the single cell 120 has thermal runaway from damaging other single cells 120, and to discharge the gas in the battery pack 100 in a timely and efficient manner, thereby effectively reducing the internal air pressure of the battery pack 100 and improving the safety performance of the battery pack 100.

[0071] In one embodiment, referring to Figure 5 The accommodating box 110 also has an exhaust cavity 112, which is located on one side of the accommodating cavity 111 in the second direction X, and the exhaust cavity 112 is separated from the accommodating cavity 111; an exhaust port 113 is opened on the accommodating box 110, and the exhaust groove 1313 is connected to the exhaust cavity 112, and the exhaust port 113 is connected to the exhaust cavity 112.

[0072] The battery pack 100 further includes a second explosion-proof valve 140 . The second explosion-proof valve 140 is disposed at the exhaust port 113 and is used to seal the exhaust port 113 .

[0073] It can be understood that when the battery pack 100 is in a normal working state, the second explosion-proof valve 140 blocks the exhaust port 113 to seal the exhaust groove 1313 and the exhaust cavity 112, thereby isolating the exhaust groove 1313 and the exhaust cavity 112 from the external space, so that the interior of the battery pack 100 is a closed space, eliminating the influence of the external environment on the components inside the battery pack 100, and ensuring the normal use of the battery pack 100.

[0074] When thermal runaway occurs in the single cell 120 in the battery pack 100, the high-temperature and high-pressure gas generated is discharged into the exhaust groove 1313 and the exhaust cavity 112 in sequence. When the air pressure in the exhaust cavity 112 reaches the pressure threshold of the second explosion-proof valve 140, the second explosion-proof valve 140 is opened, and the gas in the exhaust groove 1313 and the exhaust cavity 112 is discharged into the external environment from the exhaust port 113 to ensure the safety performance of the battery pack 100.

[0075] In one embodiment, referring to Figures 4 to 6 The top cover 131 includes: a main body 1311 and a first protrusion 1312 connected to each other; along the first direction Z, the main body 1311 is convex toward the side away from the single battery 120 away from the single battery 120 to form the first protrusion 1312, and the surface of the main body 1311 close to the single battery 120 is recessed toward the side away from the single battery 120 to form an exhaust groove 1313, so as to facilitate the processing and forming of the exhaust groove 1313 and the first protrusion 1312 on the top cover 131, thereby improving the overall molding efficiency of the top cover 131 and ultimately improving the overall processing efficiency of the battery pack 100.

[0076] Specifically, the reinforcement member 132 is connected to the side of the main body 1311 that is closest to the single battery cell 120 in the first direction Z. The reinforcement member 132 is also connected to the first protrusion 1312, further enhancing the overall strength of the top cover unit 130 and preventing large-scale deformation of the top cover unit 130 when subjected to stress. In one embodiment, the venting groove 1313 and the first protrusion 1312 are disposed opposite each other in the first direction Z, and the reinforcement member 132 abuts against the wall of the venting groove 1313.

[0077] The first protrusion 1312 may abut against an external element.

[0078] The exhaust groove 1313 and the first protrusion 1312 are both in a long strip shape.

[0079] The exhaust groove 1313 and the first protrusion 1312 can be integrally cast with the top cover 131 using a casting mold; alternatively, the top cover 131 can be first die-cast using a casting mold, and then the exhaust groove 1313 and the first protrusion 1312 can be stamped on the top cover 131 using a stamping machine, but the present invention is not limited thereto. This application does not impose any specific restrictions and the selection can be made based on actual circumstances.

[0080] By providing a first protrusion 1312 on the top cover 131, the present application can utilize the first protrusion 1312 to abut external components, further preventing large-scale deformation of the top cover unit 130 when subjected to force, and preventing failure of the connection between the top cover unit 130 and external connecting components, thereby ensuring the reliability and safety of the battery pack 100 and ultimately improving the safety performance of the battery pack 100. In one embodiment, multiple first protrusions 1312 and vent grooves 1313 are provided, each extending along the second direction X and spaced apart in the third direction Y.

[0081] The present application provides multiple first protrusions 1312 to further utilize the multiple first protrusions 1312 to abut external components, further preventing large-scale deformation of the top cover unit 130 when subjected to force, thereby ensuring the reliability and safety of the battery pack 100. Multiple exhaust slots 1313 are also provided to further promptly and efficiently exhaust gases generated by thermal runaway within the battery pack 100, effectively reducing the internal air pressure of the battery pack 100 and improving the safety performance of the battery pack 100. The reinforcement 132 is connected to the multiple first protrusions 1312, further enhancing the overall strength of the top cover unit 130.

[0082] In one embodiment, referring to Figures 5 and 6 The battery pack 100 further includes an insulating spacer 150 , which is disposed between the top cover 131 and the single battery 120 , and at least a portion of the reinforcement 132 is disposed between the top cover 131 and the insulating spacer 150 .

[0083] In actual use, the top cover 131, at least a portion of the reinforcement 132, and the insulating spacer 150 are stacked in sequence, wherein at least a portion of the reinforcement 132 has two surfaces in contact with the top cover 131 and the insulating spacer 150, respectively, which has the beneficial effect of increasing the overall rigidity of the top cover unit 130. Furthermore, at least a portion of the reinforcement 132 passes through the top cover 131 and is connected to the connecting beam 300. Since at least a portion of the reinforcement 132 is connected between the top cover 131 and the insulating spacer 150, the reinforcement 132 also has the beneficial effect of increasing the overall rigidity of the top cover unit 130.

[0084] Specifically, a plurality of exhaust holes 151 are formed on the insulating spacer 150 . Each exhaust hole 151 is disposed opposite to a first explosion-proof valve 121 , and each exhaust hole 151 is communicated with the exhaust groove 1313 .

[0085] The insulating spacer 150 may be made of thermosetting material and reinforced fiber, but is not limited thereto.

[0086] The insulating spacer 150 is planar, but not limited thereto, to ensure the flatness of the interior of the battery pack 100 .

[0087] There is also a structural adhesive layer between the insulating spacer 150 and the single battery 120 to ensure a tight connection between the two.

[0088] It can be understood that the present application improves the thermal insulation and safety performance of the battery pack 100 by setting an insulating isolation member 150 between the top cover 131 and the single cell 120. At the same time, the present application provides a plurality of exhaust holes 151 on the insulating isolation member 150. When the single cell 120 in the battery pack 100 suffers from thermal runaway, the high-temperature and high-pressure gas generated is discharged to the exhaust groove 1313 and the exhaust cavity 112 through the exhaust hole 151, and then discharged to the external space of the battery pack 100, ensuring that the gas in the battery pack 100 is discharged in a timely and efficient manner, effectively reducing the internal air pressure of the battery pack 100, and improving the safety performance of the battery pack 100.

[0089] In one embodiment, referring to Figure 4 、 Figures 7 and 8 The top cover 131 also includes a second protrusion 1314. The main body 1311 defines a receiving slot 1315. Both the second protrusion 1314 and the receiving slot 1315 extend along the third direction Y, i.e., both are elongated. The second protrusion 1314 is connected to the first protrusion 1312, and the receiving slot 1315 is connected to the exhaust slot 1313. At least a portion of the reinforcement member 132 is accommodated in the receiving slot 1315.

[0090] Specifically, the main body 1311 bulges away from the surface of the single cell 120 toward the side away from the single cell 120 to form a second bulge 1314, and the surface of the main body 1311 close to the single cell 120 is recessed toward the side away from the single cell 120 to form a receiving groove 1315, so as to facilitate the processing and forming of the second bulge 1314 and the receiving groove 1315 on the top cover 131, thereby improving the overall forming efficiency of the top cover 131 and ultimately improving the overall processing efficiency of the battery pack 100.

[0091] The second protrusion 1314 can abut against external components to further prevent the top cover unit 130 from undergoing large-scale deformation when subjected to force, thereby ensuring the reliability and safety of the battery pack 100 .

[0092] The second protrusion 1314 and the receiving groove 1315 can be integrally cast with the top cover 131 using a casting mold; alternatively, the top cover 131 can be first die-cast using a casting mold, and then the second protrusion 1314 and the receiving groove 1315 can be stamped on the top cover 131 using a stamping machine, but the present invention is not limited thereto. This application does not impose any specific restrictions and the selection can be made based on actual circumstances.

[0093] In one embodiment, referring to Figures 7 and 8 The reinforcement member 132 includes a reinforcement portion 1321 , a protruding portion 1322 and a connecting portion 1323 .

[0094] The reinforcing portion 1321 is arranged in the accommodating groove 1315, and the protruding portion 1322 is arranged in the exhaust groove 1313. The reinforcing portion 1321 protrudes away from the surface of the single cell 120 toward the side away from the single cell 120 to form the protruding portion 1322; along the first direction Z, one end of the connecting portion 1323 is connected to the protruding portion 1322, and the other end is passed through the top cover 131 for connection with external components.

[0095] Among them, the reinforcement part 1321, the raised part 1322 and the connecting part 1323 can be integrally formed, that is, the reinforcement part 1321, the raised part 1322 and the connecting part 1323 are an integrated structure; the reinforcement part 1321, the raised part 1322 and the connecting part 1323 can also be fixedly connected to each other, for example, the raised part 1322 is fixedly connected to the reinforcement part 1321 and the connecting part 1323 respectively by a process such as welding. This is not specifically limited in this application and can be specifically set according to actual circumstances. For example, in this application, the reinforcement part 1321, the raised part 1322 and the connecting part 1323 are integrally formed.

[0096] The reinforcement portion 1321 is planar.

[0097] The connection portion 1323 may be a fastener, such as a screw or a bolt, but is not limited thereto.

[0098] Specifically, the reinforcement part 1321 is configured to fit respectively with the insulating spacer 150 and the top cover 131 . The top cover 131 , the reinforcement part 1321 and the insulating spacer 150 fitting together in sequence have the effect of improving the connection strength between the three and the rigidity of the top cover unit 130 .

[0099] There is a certain distance between the protrusion 1322 and the insulating spacer 150 to slow down the heat generated by the single battery 120 from being transferred to other parts of the electrical device through the top cover unit 130, thereby improving the thermal insulation capacity of the battery pack 100 and preventing the battery pack from transferring heat too quickly.

[0100] In one embodiment, since the reinforcement member 132 is disposed on the side of the top cover 131 facing the single cells 120 and is required to connect the reinforcement member 132 to the connecting beam 300, a hole is required in the top cover 131 to connect the reinforcement member 132 to the connecting beam 300. Specifically, a connecting hole (not shown) is provided in the top cover 131, through which the connecting portion 1323 connected to the protrusion 1322 can pass. The connecting portion 1323 passing through the connecting hole can then connect to the connecting beam 300, thereby connecting the battery pack to external components. Furthermore, the protrusion 1322 is tightly fitted to the top cover 131 to ensure that the connecting hole is sealed after assembly of the battery pack 100, thereby ensuring the airtightness of the battery pack 100.

[0101] In one embodiment, the reinforcing portion 1321 extends along the second direction Y to the edge of the receiving box 110 and is connected to the edge of the receiving box 110 .

[0102] Specifically, in the third direction Z, the reinforcing portion 1321 and the edge of the receiving box 110 overlap to a certain extent, so as to improve the overall strength of the battery pack 100 .

[0103] There may be a gap in the overlapping portion between the reinforcement portion 1321 and the container body 110 , and the gap can be filled with a sealing component such as a sealant to ensure sealing between the top cover 131 and the container body 110 .

[0104] In one embodiment, referring to Figures 9 and 10 The single battery 120 includes: a shell 122 , a first end cover 123 , a second end cover 124 and a terminal 125 .

[0105] The first end cap 123 and the second end cap 124 are respectively disposed at opposite ends of the housing 122 in the first direction Z. The first end cap 123 is positioned closer to the top cover 131 than the second end cap 124. The first explosion-proof valve 121 is disposed on the first end cap 123 and is connected to the insulating spacer 150, so that the first explosion-proof valve 121 faces the top cover 131. This significantly increases the bonding area between the first end cap 123 and the insulating spacer 150 of the single cell 120, reducing step difference, simplifying glue injection, improving adhesive reliability, and lowering costs. The terminal 125 is disposed on the second end cap 124, placing the single cell 120 in an inverted position. This enhances the bottom protection strength of the single cell 120, reduces the cost of the bottom protection component, improves the space utilization of the single cell 120 in the first direction Z, and achieves thermal and electrical isolation. In addition, the first explosion-proof valve 121 is arranged on the first end cover 123, the pole 125 is arranged on the second end cover 124, and the pole is electrically connected to the CCS (Cells Contact System, integrated busbar). In this way, the first explosion-proof valve 121 and the CCS will be located on different sides of the battery pack 100 in the first direction Z. In this way, when the first explosion-proof valve 121 is opened, it will not affect the CCS, and the thermal and electrical separation of the battery pack 100 can be achieved, thereby providing the safety of the battery pack 100.

[0106] In one embodiment, the battery pack further has a reference plane P perpendicular to the first direction Z; the orthographic projection of the reinforcement 132 on the reference plane P at least partially overlaps with the orthographic projection of the first end caps 123 of two adjacent single cells 120 on the reference plane P, so that the reinforcement 132 spans at least two single cells 120, thereby reducing the problem of excessive deformation of the single cells 120 due to impact, thereby reducing the impact deformation of the single cells 120 on the top cover unit 130, avoiding the top cover unit 130 from separating from the single cells 120 due to deformation, and improving the reliability of the battery pack 100.

[0107] Specifically, the housing 122 has two first side walls 1221 disposed opposite to each other in the third direction Y, and two second side walls 1222 disposed opposite to each other in the second direction X. The area of the second side walls 1222 is larger than that of the other side walls.

[0108] The orthographic projection of the reinforcement 132 on the reference plane P at least partially overlaps with the orthographic projection of the first side wall 1221 of two adjacent single cells 120 on the reference plane P, so that the reinforcement 132 spans at least two single cells 120, which reduces the problem of excessive deformation of the single cells 120 due to impact, thereby reducing the impact deformation of the single cells 120 on the top cover unit 130, avoiding the top cover unit 130 from separating from the single cells 120 due to deformation, and improving the reliability of the battery pack 100.

[0109] In one embodiment, the battery pack 100 further includes: a thermal management element (not shown in the figure), which is disposed in the containing box 110, and the thermal management element covers at least one of the first side wall 1221, the second side wall 1222 and the second end cover 124, so that the thermal management element dissipates heat to the liquid cooler, thereby isolating the heat transfer of the thermal runaway single battery 120, reducing the risk of heat spread in the single battery 120, and improving the safety performance of the battery pack 100.

[0110] The single battery 120 is connected to the cold plate to form a whole, and the battery pack is then bonded to the top cover unit 130 . This connection method improves the modal properties of the top cover unit 130 and the battery pack 100 , which is beneficial to improving the structural stability of the battery pack 100 .

[0111] On the other hand, in the embodiments of the present application, referring to Figure 1 、 Figure 2 and Figure 11 The present application also provides an electrical device, including: an electrical body 200, a battery pack 100 as described in any of the above embodiments, and a connecting beam 300, the battery pack 100 is connected to the electrical body 200 through the connecting beam 300, and the battery pack 100 is used as a power supply for the electrical device.

[0112] Specifically, the top cover 131 of the battery pack 100 is connected to the connecting beam 300, and further to the power-consuming device 200, via the connecting portion 1323 of the reinforcement 132. Therefore, the top cover unit 130 can be considered a part of the power-consuming device 200. When the power-consuming device is subjected to an external impact, since the top cover unit 130 of the battery pack 100 includes the top cover 131 and the reinforcement 132, and a portion of the reinforcement 132 passes through the top cover 131 and connects to the connecting beam 300, this structure has the effect of increasing the connection rigidity of the top cover unit 130, thereby having the beneficial effect of improving the connection strength between the battery pack and the connecting beam 300.

[0113] Among them, electrical devices can be but are not limited to electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0114] In one embodiment, the electrical device further includes: a seal 400, which is arranged between the top cover 131 and the connecting beam 300. The seal 400 refers to a component that can prevent fluid or solid particles from leaking from adjacent joint surfaces, and can prevent external impurities such as dust and moisture from invading other positions of the electrical body 200.

[0115] Specifically, the seal 400 is an annular structure. The seal 400 is connected between the two opposite surfaces of the top cover 131 and the connecting beam 300, and has an annular contact interface with the above two surfaces, which can prevent external fluid from entering the interior of the battery pack 100 through the contact section between itself and the two surfaces, thereby achieving a sealing effect.

[0116] The seal 400 may be any one of a sealing ring and a sealing gasket, but is not limited thereto. Specifically, the seal 400 may be made of materials such as rubber and silicone. Specifically, the seal 400 may be an O-ring seal, a square seal, a special-shaped seal, etc. Exemplarily, the specific shape of the seal 400 may be adapted to the shapes of the two opposing surfaces of the top cover 131 and the connecting beam 300. For example, when the two opposing surfaces of the top cover 131 and the connecting beam 300 are annular surfaces, the seal 400 may be an O-ring seal, so that the top cover 131 and the connecting beam 300 are sealed and connected, and the sealing is reliable and the cost is low.

[0117] In one embodiment, along the first direction Z, the orthographic projection of the seal 400 on the reference plane P at least partially overlaps with the orthographic projection of the connecting beam 300 on the reference plane P, so as to further prevent fluid or solid particles from invading the battery pack 100 or other positions of the power-consuming body 200 from the gap between at least two of the above three, which has the beneficial effect of improving the sealing performance.

[0118] The above steps are merely provided to help understand the method, structure, and core concept of the present application. A person skilled in the art may make several improvements and modifications to the present application without departing from the principles of the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack having a first orientation, characterized in that: include: The accommodating box is provided with an accommodating cavity with an open opening; A plurality of single cells, each of which is disposed in the accommodating cavity, and each of which has a first explosion-proof valve, and the first explosion-proof valve is disposed on a side of the single cell that is open to the accommodating cavity; as well as A top cover unit, comprising: a top cover and a reinforcement member, wherein the top cover covers the opening of the accommodating cavity, and at least a portion of the reinforcement member is connected to a side of the top cover close to the single battery in the first direction; An exhaust groove is provided on the top cover, at least part of the reinforcement is arranged in the exhaust groove, and the notch of the exhaust groove is arranged opposite to the first explosion-proof valve, so that the thermal runaway gas generated by the single battery can enter the exhaust groove through the first explosion-proof valve and be discharged outside the containing box.

2. The battery pack according to claim 1, wherein: The battery pack also has a second direction intersecting the first direction; The housing further comprises an exhaust cavity, the exhaust cavity being located on one side of the housing cavity in the second direction, and the exhaust cavity being separated from the housing cavity; An exhaust port is provided on the housing body, the exhaust groove is communicated with the exhaust cavity, and the exhaust port is communicated with the exhaust cavity; The battery pack further includes: a second explosion-proof valve disposed at the exhaust port, wherein the second explosion-proof valve is used to seal the exhaust port.

3. The battery pack according to claim 1, wherein: The top cover includes: a main body and a first protrusion connected to each other; along the first direction, the main body is convex away from the surface of the single cell and away from the single cell to form the first protrusion, and the surface of the main body close to the single cell is concave toward the side away from the single cell to form the exhaust groove; The reinforcement is connected to a side of the main body portion close to the single battery in the first direction, and the reinforcement is connected to the first protrusion.

4. The battery pack according to claim 3, wherein: The battery pack further has a second direction and a third direction intersecting the first direction in pairs; There are multiple first protrusions and multiple exhaust grooves, and the multiple first protrusions and multiple exhaust grooves extend along the second direction. The multiple first protrusions and multiple exhaust grooves are arranged at intervals in the third direction, and the reinforcement is connected to the multiple first protrusions.

5. The battery pack according to any one of claims 1 to 4, wherein: Also includes: an insulating spacer disposed between the top cover and the single battery, and at least a portion of the reinforcing member is disposed between the top cover and the insulating spacer; A plurality of exhaust holes are provided on the insulating spacer, each of the exhaust holes is arranged opposite to one of the first explosion-proof valves, and each of the exhaust holes is communicated with the exhaust groove.

6. The battery pack according to claim 3, wherein: The battery pack further has a third direction intersecting with the first direction; The top cover further includes a second convex portion, and the main body is provided with a receiving groove; The second protrusion and the accommodating groove both extend along the third direction, the second protrusion is connected to the first protrusion, and the accommodating groove is communicated with the exhaust groove, the main body is convex away from the surface of the single cell and away from the single cell to form the second protrusion, and the surface of the main body close to the single cell is recessed toward the side away from the single cell to form the accommodating groove, and at least part of the reinforcement is accommodated in the accommodating groove.

7. The battery pack according to claim 6, wherein: The reinforcement member includes: a reinforcement portion, a raised portion and a connecting portion; The reinforcing portion is arranged in the accommodating groove, and the protruding portion is arranged in the exhaust groove. The reinforcing portion protrudes away from the surface of the single cell and toward the side away from the single cell to form the protruding portion; along the first direction, one end of the connecting portion is connected to the protruding portion, and the other end is passed through the top cover for connection with external components.

8. The battery pack according to claim 1, wherein: The single cell comprises: a shell, a first end cover, a second end cover and a pole; The first end cover and the second end cover are respectively arranged at two opposite ends of the shell in the first direction. The first end cover is arranged close to the top cover relative to the second end cover. The first explosion-proof valve is arranged on the first end cover, and the pole is arranged on the second end cover.

9. The battery pack according to claim 8, wherein: The battery pack further has a third direction intersecting the first direction, and a reference plane perpendicular to the first direction; The orthographic projection of the reinforcement on the reference plane at least partially overlaps with the orthographic projections of the first end covers of two adjacent single batteries on the reference plane.

10. An electrical device, characterized in that: include: An electric body, a battery pack and a connecting beam according to any one of claims 1 to 9, wherein the battery pack is connected to the electric body via the connecting beam, and the battery pack is used as a power supply for the electric device.

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