Battery pack and electric device

Abstract

This application relates to the field of battery technology, specifically disclosing a battery pack and an electrical device. The battery pack includes: a housing, which includes a base plate and side beams. The side beams are arranged around the edge of the base plate, and the base plate and side beams cooperate to form a receiving cavity; multiple individual batteries, all of which are disposed within the receiving cavity; and a protective element, which includes: multiple connected protective plates and multiple supporting parts. The protective plates are disposed on the side of the base plate near the individual batteries, and the supporting parts are disposed on one side of the protective plates. One of the protective plates and the supporting parts is connected to the individual batteries, and the other is connected to the base plate. Along a first direction, the orthographic projections of each protective plate on a reference plane and the orthographic projections of each supporting part on the reference plane are staggered. According to this application, the overall rigidity of the protective element is improved, which helps the protective element to effectively protect the individual batteries and improves the overall modal characteristics and protective strength of the battery pack.

Description

Technical Field

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

[0002] With the rapid development of the new energy industry, battery packs with high energy density, long cycle life, and high safety performance have been widely used and developed, and the demand for battery packs with larger capacity, greater durability, and enhanced safety is extremely urgent. Safety performance is one of the core performance characteristics of a battery pack. Therefore, how to improve the safety performance of battery packs has become a pressing issue that needs to be addressed. Utility Model Content

[0003] Embodiments of this application provide a battery pack and an electrical device to improve the overall modality and protection strength of the battery pack, thereby enhancing the safety performance of the battery pack.

[0004] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0005] On one hand, a battery pack is provided, having a first direction and a reference plane perpendicular to the first direction, including:

[0006] The enclosure includes a bottom plate and side beams. The side beams are arranged around the edge of the bottom plate, and the bottom plate and side beams cooperate to form a receiving cavity.

[0007] Multiple individual cells, all housed within a receiving cavity; and

[0008] The protective element includes: multiple connected protective plates and multiple supporting parts. The protective plates are disposed on the side of the base plate near the single cell, and the supporting parts are disposed on the side of the protective plates along the first direction. One of the protective plates and the supporting parts is connected to the single cell, and the other is connected to the base plate.

[0009] Along the first direction, the orthographic projections of each protective plate on the reference plane and the orthographic projections of each support on the reference plane are arranged alternately.

[0010] In addition to one or more of the features disclosed above, or as an alternative, the support portion is disposed on the side of the protective plate portion near the individual battery cell, the support portion is connected to the individual battery cell, and the protective plate portion is connected to the base plate.

[0011] In addition to one or more of the features disclosed above, or alternatively, the battery pack also has a second direction and a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other;

[0012] Multiple protective plates extend in a third direction, and are arranged along a second direction; multiple support portions extend in the second direction, and are arranged along a third direction; or,

[0013] Multiple protective plates extend in a second direction and are arranged along a third direction; multiple support plates extend in a third direction and are arranged along a second direction.

[0014] In addition to one or more of the features disclosed above, or as an alternative, multiple individual cells are arranged along a second direction and a third direction, respectively;

[0015] Along the first direction, the orthographic projection of multiple individual cells on the reference plane lies within the orthographic projection of multiple protective plates on the reference plane.

[0016] In addition to one or more of the features disclosed above, or as an alternative, the base plate includes: a plurality of load-bearing parts, which are fixedly connected to each other, and all of the plurality of load-bearing parts are connected to the edge beams;

[0017] Along the first direction, the orthographic projections of each protective plate on the reference plane and the orthographic projections of each supporting part on the reference plane are arranged alternately.

[0018] In addition to one or more of the features disclosed above, or as an alternative, the protective plate is provided with a tenon and a tenon groove, the tenon and the tenon groove being located on opposite sides of the protective plate along its arrangement direction, and the tenon on one of two adjacent protective plates being embedded in the tenon groove on the other.

[0019] In addition to one or more of the features disclosed above, or alternatively, the protective element may further include: an adhesive layer disposed between two adjacent protective plates to bond and fix the two adjacent protective plates together.

[0020] In addition to one or more of the features disclosed above, or as an alternative, the side beam has a fixing part on the side near the receiving cavity, and the fixing part is located on the side of the protective plate near the single cell.

[0021] The battery pack also includes a locking element, which passes through the fixing part and connects the protective plate part and the fixing part.

[0022] In addition to one or more of the features disclosed above, or as an alternative, the single cell includes: a battery body and an explosion-proof valve, the battery body having a first outer wall facing the base plate, the explosion-proof valve being disposed on the first outer wall;

[0023] The protective plate and two adjacent support sections enclose an exhaust chamber, and the explosion-proof valve is positioned opposite the exhaust chamber.

[0024] In addition to one or more of the features disclosed above, or as an alternative, the protective element further includes: a plurality of exhaust vents, each of which extends along the extension direction of the support portion, each of which is disposed on the side of the protective plate portion near the individual battery cell, the plurality of exhaust vents being located between two adjacent support portions, the exhaust vents being connected to the first outer wall, and the plurality of exhaust vents being spaced apart to divide the exhaust chamber into a plurality of exhaust channels, wherein the explosion-proof valve of each individual battery cell is connected to a corresponding exhaust channel.

[0025] In addition to one or more of the features disclosed above, or as an alternative, the protective element further includes: a plurality of supports, each support being connected to a corresponding exhaust section on the side near the explosion-proof valve, and each support being located in a corresponding exhaust channel, and along the first direction, the orthographic projection of the support on the reference plane does not coincide with the orthographic projection of the explosion-proof valve on the reference plane.

[0026] The battery pack also includes: a first partition, disposed on the side of the support near the explosion-proof valve, and along the first direction, the orthographic projection of the explosion-proof valve on the reference plane is located within the orthographic projection of the first partition on the reference plane.

[0027] In addition to one or more of the features disclosed above, or as an alternative, the battery pack further includes: a second partition disposed on the outer surface of the exhaust portion near the exhaust passage, and / or disposed on the outer surface of the protective plate portion near the exhaust passage, the second partition being spaced apart from the explosion-proof valve in a first direction.

[0028] In addition to one or more of the features disclosed above, or alternatively, the battery pack further includes: a first cushioning member disposed between the support and the first outer wall; and

[0029] The second buffer is located between the exhaust section and the first outer wall.

[0030] On the other hand, a further electrical device is disclosed, which, in addition to one or more of the features disclosed above, or as an alternative, includes a battery pack as described in any of the preceding claims, the battery pack serving as a power source for the electrical device.

[0031] One of the above technical solutions has the following advantages or beneficial effects: By setting a protective element between the housing and the individual battery cells, and staggering the orthographic projections of each protective plate on the reference plane with the orthographic projections of each support on the reference plane, the protective plates and supports can cooperate with each other in a cross-shaped manner. This helps the supports to support the individual battery cells, while also improving the overall rigidity of the protective element. This helps the protective element to effectively protect the individual battery cells, improves the overall mode and protection strength of the battery pack, and thus improves the safety performance of the battery pack. At the same time, the high integration between the housing, protective element and individual battery cells in this application is beneficial to improving the space utilization rate of the individual battery cells in the first direction, thereby improving the volume utilization rate of the battery pack. It also reduces the overall weight of the battery pack and reduces production costs. Attached Figure Description

[0032] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0033] Figure 1 This is an exploded structural view of the battery pack provided according to a specific embodiment of this application;

[0034] Figure 2 This is a top view of the battery pack provided according to a specific embodiment of this application;

[0035] Figure 3 This is a cross-sectional view of the battery pack along the AA direction according to a specific embodiment of this application;

[0036] Figure 4 yes Figure 3 A magnified view of a section at point D;

[0037] Figure 5 This is a cross-sectional view along the AA direction of a battery pack with another structure provided according to a specific embodiment of this application;

[0038] Figure 6 This is a schematic diagram of a protective element with another structure according to a specific embodiment of this application;

[0039] Figure 7 This is a partial cross-sectional view of the protective plate portion provided according to a specific embodiment of this application;

[0040] Figure 8 This is a partial exploded cross-sectional view of the protective plate provided according to a specific embodiment of this application;

[0041] Figure 9 This is an exploded structural view of the battery pack according to a specific embodiment two of this application;

[0042] Figure 10This is a top view of the battery pack provided according to a specific embodiment two of this application;

[0043] Figure 11 This is a cross-sectional view of the battery pack along the BB direction according to a specific embodiment of this application;

[0044] Figure 12 yes Figure 11 A magnified view of a section at point E in the middle;

[0045] Figure 13 This is a schematic diagram of the structure of the protective element provided according to a specific embodiment two of this application;

[0046] Figure 14 This is an exploded structural view of the protective element provided according to a specific embodiment two of this application;

[0047] Figure 15 This is an exploded structural view of the battery pack provided according to a specific embodiment three of this application;

[0048] Figure 16 This is a top view of the battery pack provided according to specific embodiment three of this application;

[0049] Figure 17 This is a cross-sectional view of the battery pack along the CC direction according to a specific embodiment of this application.

[0050] Explanation of reference numerals in the attached figures:

[0051] 100. Battery pack; 110. Housing; 111. Base plate; 1111. Supporting part; 112. Side beam; 1121. Fixing part; 113. Receiving cavity; 121. Individual battery; 1211. Battery body; 1212. Explosion-proof valve; 1213. Terminal post; 1214. First outer wall; 1215. Second outer wall; 130. Protective element; 131. Protective plate; 1311. Tenon joint; 1312. Tenon groove; 1313. Receiving groove; 132. Support part; 133. Exhaust part; 134. Supporting part; 135. Exhaust chamber; 1351. Exhaust channel; 136. Adhesive layer; 140. First partition; 150. Second partition; 160. First buffer; 170. Locking part; 180. Second buffer; 190. Cover. Detailed Implementation

[0052] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0053] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] With the rapid development of new energy vehicles, the safety performance of battery packs has received increasing attention. Specifically, bottom protection of the battery pack, as a crucial component of overall battery pack safety, has gradually become a research focus in the power battery industry. Existing bottom protection solutions for battery packs are relatively simple, typically involving the installation of complex, heavy-duty plates at the bottom. This results in heavy and costly battery packs, and still poses significant safety risks and lacks reliability in terms of bottom protection.

[0057] To address the aforementioned problems, in the embodiments of this application, reference is made to... Figure 1 This application provides a battery pack 100, which has a first direction Z, a second direction X, and a third direction Y that are perpendicular to each other. For example, the battery pack 100 has a first direction Z, a second direction X, and a third direction Y that are mutually perpendicular to each other. "Perpendicular" refers to a state where the angle formed by a straight line and a straight line, a straight line and a surface, or a surface and a surface is 89° to 91°. For example, in this application, the first direction Z is the height direction of the battery pack 100, the second direction X is the length direction of the battery pack 100, and the third direction Y is the width direction of the battery pack 100.

[0058] In a specific embodiment of this application, refer to Figures 1 to 3 The battery pack 100 also has a reference plane P perpendicular to the first direction Z.

[0059] Specifically, the battery pack 100 includes: a housing 110, individual batteries 121, protective components 130, and a cover 190.

[0060] Specifically, the housing 110 includes: a bottom plate 111 and a side beam 112. The side beam 112 is arranged around the edge of the bottom plate 111, and the bottom plate 111 and the side beam 112 cooperate to form a receiving cavity 113. Multiple individual batteries 121 are provided, and the multiple individual batteries 121 are all arranged in the receiving cavity 113. The multiple individual batteries 121 are arranged along the second direction X and the third direction Y, respectively. The protective element 130 includes: multiple connected protective plate parts 131 and multiple support parts 132. The protective plate parts 131 are provided on the side of the bottom plate 111 near the individual battery 121, and the support parts 132 are provided on the side of the protective plate parts 131 near the individual battery 121. The support parts 132 are connected to the individual battery 121 to support the individual battery 121. The cover 190 is connected to the housing 110 to cover the receiving cavity 113 of the housing 110.

[0061] Specifically, along the first direction Z, the orthographic projections of each protective plate portion 131 on the reference plane P and the orthographic projections of each support portion 132 on the reference plane P are arranged in an interlaced manner, that is, the orthographic projections of each protective plate portion 131 on the reference plane P and the orthographic projections of each support portion 132 on the reference plane P form an interwoven mesh structure.

[0062] The battery pack 100 can be a three-tiered battery pack 100 consisting of individual cells 121, battery modules, and a battery pack. Specifically, the individual cells 121 are first grouped into battery modules, and then the battery modules are placed inside the housing 110 to form a battery pack. Alternatively, it can be a two-tiered battery pack 100 consisting of individual cells 121 and a battery pack, where the individual cells 121 are directly housed inside the housing 110 to form a battery pack. No specific limitations are imposed in this application; the design can be tailored to the specific circumstances, as long as it does not affect the effectiveness of this application.

[0063] The enclosure 110 is made of ordinary steel or aluminum, but is not limited to these materials.

[0064] The base plate 111 and the side beam 112 are welded and fixed together to ensure the overall sealing performance of the box 110.

[0065] The lid 190 is made of metal, but it is not limited to that.

[0066] The single cell 121 can be a rechargeable battery, which refers to a single cell that can be recharged after discharge to activate the active materials and continue to be used. For example, the single cell 121 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, or nickel-cadmium battery, but is not limited to these.

[0067] The single cell 121 can be a cylindrical cell, a prismatic cell, a pouch cell, or a cell of other shapes. For example, in this application, the single cell 121 is a square lithium-ion cell.

[0068] The single-cell battery 121 may include a casing, electrode assembly, electrolyte, end cap, terminal post 1213, and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with additives, used to wet the electrode assembly. The electrode assembly is the component in the single-cell battery 121 where electrochemical reactions occur, and there may be one or more electrode assemblies. The electrode assembly is mainly formed by stacking or winding a positive electrode, a separator, and a negative electrode. The portions of the positive and negative electrode with active material constitute the electrode body, while the portions without active material each constitute a tab. During the charging and discharging process of the single-cell battery 121, the positive and negative active materials react with the electrolyte, and the tabs are electrically connected to the terminal post 1213 to form a current loop, enabling the single-cell battery 121 to function normally.

[0069] The protective plate portion 131 and the support portion 132 are fixedly connected. For example, the protective plate portion 131 and the support portion 132 can be fixedly connected by means of bonding, snap-fitting, tenoning or screwing, but are not limited to these.

[0070] The protective plate 131 is fixedly connected to the bottom plate 111 and the side beam 112 of the box body 110. For example, the protective plate 131 can be fixedly connected to the bottom plate 111 and the side beam 112 of the box body 110 by means of bonding, snap-fitting, tenoning, welding or screwing, but is not limited to these methods.

[0071] This application provides a protective element 130 between the housing 110 and the individual battery 121. The orthographic projections of each protective plate 131 on the reference plane P and the orthographic projections of each support portion 132 on the reference plane P are staggered, allowing the protective plate 131 and support portion 132 to cooperate in a cross-shaped manner. This helps the support portion 132 support the individual battery 121 and increases the overall rigidity of the protective element 130, thus improving the overall modal characteristics and protection strength of the battery pack 100 and enhancing its safety performance. Furthermore, the high integration between the housing 110, the protective element 130, and the individual battery 121 in this application improves the space utilization of the individual battery 121 in the first direction Z, thereby increasing the volume utilization of the battery pack 100. It also reduces the overall weight of the battery pack 100 and lowers production costs.

[0072] In other embodiments, the support portion 132 is disposed on the side of the protective plate portion 131 near the base plate 111, the support portion 132 is connected to the base plate 111, and the protective plate portion 131 is connected to the individual battery cell 121. This forms a buffer cavity between the protective plate portion 131 and the base plate 111, which can also improve the safety of the battery pack.

[0073] In some embodiments, refer to Figure 1 Multiple protective plates 131 extend in the third direction Y and are arranged along the second direction X. Multiple support portions 132 extend in the second direction X and are arranged along the third direction Y. This arrangement allows the protective plates 131 and support portions 132 to cooperate with each other in a cross manner, which helps the protective element 130 to effectively protect the individual battery 121, improve the overall mode and protection strength of the battery pack 100, and thus improve the safety performance of the battery pack 100.

[0074] In other embodiments, reference is made to Figure 6 Multiple protective plates 131 extend in the second direction X and are arranged along the third direction Y. Multiple support portions 132 extend in the third direction Y and are arranged along the second direction X. This arrangement allows the protective plates 131 and support portions 132 to cooperate with each other in a cross manner, which helps the protective element 130 to effectively protect the individual battery 121, improve the overall mode and protection strength of the battery pack 100, and thus improve the safety performance of the battery pack 100.

[0075] In some embodiments, both the protective plate portion 131 and the support portion 132 may be made of non-metallic materials, but are not limited thereto, so that the protective plate portion 131 and the support portion 132 have high structural strength, which helps to improve the protective effect of the protective plate portion 131 and the support portion 132, while also making the protective plate portion 131 and the support portion 132 have heat insulation protection effect and reducing the production cost of the protective plate portion 131 and the support portion 132.

[0076] For example, both the protective plate portion 131 and the support portion 132 may be made of a composite material with added glass fiber and / or glass fiber cloth, but are not limited thereto.

[0077] Understandably, the protective plate portion 131 and the support portion 132, made of composite materials with added glass fiber and / or glass fiber cloth, extend along their respective pultrusion molding directions. Due to the anisotropy in mechanical properties, the protective plate portion 131 and the support portion 132 have the highest strength in the pultrusion molding direction and the lowest strength perpendicular to the pultrusion molding direction. In this application, the orthographic projections of each protective plate portion 131 on the reference plane P and the orthographic projections of each support portion 132 on the reference plane P are arranged alternately so that both the protective plate portion 131 and the support portion 132 are reinforced in their respective weaker stress directions. This helps to improve the overall stiffness of the protective element 130, which helps the protective element 130 to provide efficient protection for the single battery cell 121, improves the overall modal and protective strength of the battery pack 100, and thus improves the safety performance of the battery pack 100.

[0078] In some embodiments, a buffer layer may be provided between the protective plate portion 131 and the support portion 132, or between the protective plate portion 131 and the bottom plate 111, so as to reduce the impact force on the protective plate portion 131, the support portion 132 and the single battery cell 121, thereby achieving the function of buffering and absorbing energy and further improving the safety performance of the battery pack 100.

[0079] For example, the cushioning layer may be made of rubber or foam, but is not limited to these.

[0080] In some embodiments, refer to Figures 1 to 3 The single battery 121 includes a battery body 1211 and a terminal post 1213. The battery body 1211 has a first outer wall 1214 and a second outer wall 1215 disposed opposite to each other in a first direction Z. The first outer wall 1214 is disposed opposite to the second outer wall 1215 toward the base plate 111. The first outer wall 1214 is connected to the support portion 132. The terminal post 1213 is disposed on the second outer wall 1215.

[0081] In some embodiments, refer to Figure 3The battery pack 100 also includes a first buffer 160, which is disposed between the support portion 132 and the first outer wall 1214. The first buffer 160 reduces the impact force on the individual battery cells 121, preventing the support portion 132 from directly contacting the individual battery cells 121 and causing damage to the individual battery cells 121 when the bottom plate 111 of the housing 110 and the protective element 130 are impacted. This achieves the function of buffering and absorbing energy, thereby improving the safety performance of the battery pack 100. At the same time, the first buffer 160 can absorb the assembly tolerance of the battery pack 100 in the first direction Z, thereby improving the overall structural stability of the battery pack 100.

[0082] The first buffer 160 may be made of rubber or buffer foam, but is not limited to these.

[0083] In some embodiments, refer to Figure 1 Along the first direction Z, the orthographic projection of the multiple individual cells 121 on the reference plane P is located within the orthographic projection of the multiple protective plates 131 on the reference plane P. That is, the overall dimensions of the multiple protective plates 131 in the second direction X and the third direction Y are not less than the overall dimensions of the multiple individual cells 121 in the second direction X and the third direction Y, which helps the protective element 130 to effectively protect the individual cells 121 and improve the safety performance of the battery pack 100.

[0084] In some embodiments, refer to Figure 5 The base plate 111 includes multiple load-bearing parts 1111, which are fixedly connected to each other, and all load-bearing parts 1111 are connected to the side beam 112.

[0085] The adjacent two bearing parts 1111 can be fixedly connected by welding or other methods, but are not limited to this.

[0086] Specifically, along the first direction Z, the orthographic projections of each protective plate portion 131 on the reference plane P and the orthographic projections of each supporting portion 1111 on the reference plane P are arranged in an alternating manner, so that each protective plate portion 131 and each supporting portion 132 cooperate with each other in a cross-shaped manner, which helps to improve the strength of the weak areas of the base plate 111, thereby improving the overall strength of the base plate 111, improving the overall modal and protective strength of the battery pack 100, and improving the safety performance of the battery pack 100.

[0087] In some embodiments, when the plurality of protective plate portions 131 extend in the third direction Y and the plurality of protective plate portions 131 are arranged along the second direction X, the plurality of support portions 1111 extend in the third direction Y and the plurality of support portions 1111 are arranged along the second direction X.

[0088] When multiple protective plate portions 131 extend in the second direction X and are arranged along the third direction Y, multiple support portions 1111 extend along the third direction Y and are arranged along the second direction X.

[0089] In some embodiments, refer to Figures 7 to 8 The protective plate portion 131 is provided with a tenon 1311 and a tenon groove 1312. The tenon 1311 and the tenon groove 1312 are respectively located on both sides of the protective plate portion 131 arranged opposite to each other along its arrangement direction. The tenon 1311 on one of two adjacent protective plate portions 131 is embedded in the tenon groove 1312 on the other to fix the two adjacent protective plate portions 131 together, increase the connection strength between the two adjacent protective plate portions 131, improve the overall structural strength of the protective element 130, and thus improve the overall modal and protective strength of the battery pack 100, and improve the safety performance of the battery pack 100.

[0090] The tenon joint 1311 and the tenon groove 1312 can be integrally formed with the protective plate 131, or the protective plate 131 can be formed first, and then the protective plate 131 can be processed by processing equipment to form the tenon joint 1311 and the tenon groove 1312.

[0091] In some embodiments, refer to Figures 7 to 8 The protective element 130 also includes an adhesive layer 136, which is disposed between two adjacent protective plates 131 to bond and fix the two adjacent protective plates 131, thereby further fixing and connecting the two adjacent protective plates 131, improving the overall structural strength of the protective element 130, thereby improving the overall modal and protective strength of the battery pack 100, and improving the safety performance of the battery pack 100.

[0092] The adhesive layer 136 is made of structural adhesive, but is not limited to this.

[0093] In some embodiments, refer to Figures 3 to 4 The side beam 112 has a fixing part 1121 on the side near the receiving cavity 113, and the fixing part 1121 is located on the side of the protective plate part 131 near the single cell 121.

[0094] Specifically, the battery pack 100 also includes a locking member 170, which passes through the fixing part 1121 and connects the protective plate part 131 and the fixing part 1121 to further connect and fix the protective plate part 131, prevent the protective plate part 131 from moving freely, and further improve the structural strength of the protective element 130; at the same time, it improves the compression resistance of the housing 110, improves the overall structural strength of the housing 110, and improves the overall modal and protective strength of the battery pack 100.

[0095] The fixing part 1121 and the side beam 112 can be integrally formed, that is, the fixing part 1121 and the side beam 112 are a one-piece structure. For example, the fixing part 1121 and the side beam 112 are integrally die-cast. Alternatively, the fixing part 1121 and the side beam 112 can be separately provided and fixedly connected. For example, the fixing part 1121 is fixedly connected to the side beam 112 by welding. This application does not make specific limitations and can be specifically set according to the actual situation.

[0096] The locking element 170 can be a snap-fit ​​element, a riveted element, or a bolt, but is not limited to these. For example, in this application, the locking element 170 is a bolt.

[0097] In some embodiments, refer to Figure 3 The single cell 121 also includes an explosion-proof valve 1212, which is disposed on the first outer wall 1214.

[0098] Specifically, the protective plate 131 and the two adjacent support parts 132 enclose an exhaust chamber 135, and the explosion-proof valve 1212 is arranged opposite to the exhaust chamber 135.

[0099] Understandably, when a single cell 121 in the battery pack 100 experiences thermal runaway, high-temperature and high-pressure gas will be generated inside the single cell 121. If the gas is not discharged in time, it will affect the safety of the battery pack 100.

[0100] When a single cell 121 experiences thermal runaway, the high-temperature, high-pressure gas generated inside the single cell 121 can be ejected from the explosion-proof valve 1212. Simultaneously, since the explosion-proof valve 1212 is positioned opposite to the exhaust chamber 135, the gas is discharged from the explosion-proof valve 1212 into the exhaust chamber 135. At this time, the high-temperature, high-pressure gas and ejected material diffuse along the exhaust chamber 135 and, guided by the exhaust chamber 135, are discharged into the external space of the battery pack 100. This prevents the gas ejected during the thermal runaway of the single cell 121 from damaging other single cells 121, and also efficiently and promptly discharges the gas inside the battery pack 100, effectively reducing the internal gas pressure of the battery pack 100 and improving the safety performance of the battery pack 100.

[0101] In the second specific embodiment of this application, it is further formed based on the first specific embodiment of this application.

[0102] Specifically, refer to Figures 9 to 12The protective element 130 also includes: a plurality of exhaust sections 133, which extend along the extension direction of the support section 132. The plurality of exhaust sections 133 are disposed on the side of the protective plate section 131 near the single cell 121. The plurality of exhaust sections 133 are located between two adjacent support sections 132. The exhaust sections 133 are connected to the first outer wall 1214. The plurality of exhaust sections 133 are spaced apart to divide the exhaust chamber 135 into a plurality of exhaust channels 1351. The explosion-proof valve 1212 of each single cell 121 is connected to a corresponding exhaust channel 1351.

[0103] Understandably, when a single cell 121 experiences thermal runaway, the high-temperature, high-pressure gas generated inside the single cell 121 can be ejected from the explosion-proof valve 1212. Simultaneously, since the explosion-proof valve 1212 and the exhaust channel 1351 are positioned opposite each other, the gas is discharged from the explosion-proof valve 1212 into the exhaust channel 1351. At this time, the high-temperature, high-pressure gas and ejected material diffuse along the exhaust channel 1351. Guided by the exhaust channel 1351, the gas is discharged into the external space of the battery pack 100, thereby further improving the exhaust and pressure relief performance of the battery pack 100. This further prevents the gas ejected during thermal runaway of the single cell 121 from damaging other single cells 121, and also allows for timely and efficient discharge of gas from the battery pack 100, effectively reducing the internal gas pressure of the battery pack 100 and improving the safety performance of the battery pack 100.

[0104] In some embodiments, a receiving groove 1313 is provided on the side of the protective plate portion 131 near the exhaust portion 133, and the receiving groove 1313 is filled with structural adhesive to bond and fix the protective plate portion 131 and the exhaust portion 133.

[0105] In some embodiments, refer to Figures 11 to 14 The protective element 130 also includes a plurality of support portions 134, each support portion 134 being connected to a corresponding exhaust portion 133 on the side near the explosion-proof valve 1212, and each support portion 134 being located in a corresponding exhaust channel 1351. Along the first direction Z, the orthographic projection of the support portion 134 on the reference plane P does not coincide with the orthographic projection of the explosion-proof valve 1212 on the reference plane P, so that the support portion 134 does not interfere with the pressure relief and exhaust of the explosion-proof valve 1212, which helps to discharge the gas in the battery pack 100 in a timely and efficient manner.

[0106] The supporting part 134 and the venting part 133 can be integrally formed, that is, the supporting part 134 and the venting part 133 are a one-piece structure. For example, the supporting part 134 and the venting part 133 are integrally injection molded. Alternatively, the supporting part 134 and the venting part 133 can be separately provided and fixedly connected. For example, the supporting part 134 is fixedly connected to the venting part 133 by snap-fit ​​or adhesive processes. This application does not make specific limitations and can be specifically set according to the actual situation.

[0107] Specifically, the battery pack 100 also includes a first partition 140, which is disposed on the side of the support portion 134 near the explosion-proof valve 1212, and along the first direction Z, the orthogonal projection of the explosion-proof valve 1212 on the reference plane P is located within the orthogonal projection of the first partition 140 on the reference plane P.

[0108] The first partition 140 is made of heat-insulating and fire-resistant materials. For example, the first partition 140 is made of mica board, but it is not limited to this.

[0109] Understandably, when a single cell 121 experiences thermal runaway, the ejected high-temperature and high-pressure gas and ejected material splash and bounce off the wall, which can easily affect other single cells 121 that have not yet experienced thermal runaway, thus causing a chain reaction of thermal runaway in other single cells 121.

[0110] This application provides a first separator 140 to separate the individual battery 121 from the exhaust channel 1351. When the individual battery 121 experiences thermal runaway, after the portion of the first separator 140 opposite to the explosion-proof valve 1212 of the individual battery 121 is ruptured, the remaining portion of the first separator 140 has a unidirectional blocking effect, preventing high-temperature and high-pressure gases and ejected materials from splashing and rebounding after hitting the wall, thus affecting other unrunaway individual batteries 121 and protecting the individual batteries 121 that have not experienced thermal runaway, thereby further improving the safety performance of the battery pack 100.

[0111] In some embodiments, a weak area is provided on the first partition 140, which is disposed opposite to the explosion-proof valve 1212. This helps to release high-temperature and high-pressure gas and ejected material into the exhaust channel 1351 in a timely manner when the single cell 121 experiences thermal runaway, and to discharge the gas in the battery pack 100 in a timely and efficient manner.

[0112] In some embodiments, refer to Figures 11 to 12 The battery pack 100 also includes a second partition 150, which can be disposed on the outer surface of the exhaust section 133 near the exhaust channel 1351 to protect the exhaust section 133. The second partition 150 can also be disposed on the outer surface of the protective plate section 131 near the exhaust channel 1351 to protect the protective plate section 131. The second partition 150 and the explosion-proof valve 1212 are spaced apart in the first direction Z.

[0113] The second partition 150 is made of heat-insulating and fire-resistant materials. For example, the second partition 150 is made of mica board, but it is not limited to this.

[0114] This application provides a second spacer 150 on the outer surface of the exhaust section 133 near the exhaust channel 1351 and on the outer surface of the protective plate section 131 near the exhaust channel 1351. This prevents the high-temperature and high-pressure gas and ejected material generated during the thermal runaway of the single cell 121 from burning through and damaging the exhaust section 133, the protective plate section 131, and the bottom plate 111. This effectively protects the exhaust section 133, the protective plate section 131, and the bottom plate 111, avoids more serious damage to the battery pack 100, and further improves the safety performance of the battery pack 100.

[0115] In some embodiments, refer to Figures 11 to 12 The battery pack 100 also includes a second buffer 180, which is disposed between the vent 133 and the first outer wall 1214 to prevent the vent 133 from directly contacting the individual battery 121 and causing damage to the individual battery 121 when the bottom plate 111 of the housing 110 and the protective element 130 are impacted, thereby achieving the function of buffering and absorbing energy and improving the safety performance of the battery pack 100. At the same time, the second buffer 180 can absorb the assembly tolerance of the battery pack 100 in the first direction Z to improve the overall structural stability of the battery pack 100.

[0116] Meanwhile, other technical features in the second specific embodiment of this application are the same as those in the first specific embodiment described above. Since the features have been described in detail in the first specific embodiment described above, the second specific embodiment of this application will not be described accordingly. For details, please refer to the description in the first specific embodiment.

[0117] In the specific embodiment three of this application, refer to Figures 15 to 17 The single battery 121 includes: a battery body 1211, an explosion-proof valve 1212, and a terminal post 1213. The battery body 1211 has a first outer wall 1214 and a second outer wall 1215 disposed opposite to each other in a first direction Z. The first outer wall 1214 is disposed opposite to the second outer wall 1215 and faces the base plate 111. The first outer wall 1214 is connected to the support part 132. The terminal post 1213 is disposed on the first outer wall 1214. The explosion-proof valve 1212 is disposed on the first outer wall 1214, that is, the explosion-proof valve 1212 and the terminal post 1213 are disposed on the same side.

[0118] The protective element 130 includes: a plurality of connected protective plate portions 131 and a plurality of support portions 132. The protective plate portions 131 are disposed on the side of the base plate 111 near the single cell 121, and the support portions 132 are disposed on the side of the protective plate portions 131 near the single cell 121. The support portions 132 are connected to the single cell 121, and the protective plate portions 131 and two adjacent support portions 132 enclose an exhaust chamber 135.

[0119] The protective element 130 also includes: a plurality of exhaust vents 133, which extend along the extension direction of the support 132 and are disposed on the side of the protective plate 131 near the individual battery 121. The exhaust vents 133 are located between two adjacent support vents 132 and are connected to the first outer wall 1214. The exhaust vents 133 are spaced apart to divide the exhaust chamber 135 into a plurality of exhaust channels 1351. The explosion-proof valve 1212 of each individual battery 121 is connected to a corresponding exhaust channel 1351, and the terminal post 1213 is located outside the exhaust channel 1351. This allows the exhaust vents 133 to separate the electrical components inside the battery pack 100, thereby achieving thermal isolation and further improving the safety performance of the battery pack 100.

[0120] Meanwhile, other technical features in specific embodiment three of this application are the same as those in specific embodiment two. Since specific embodiment two has described the features in detail above, specific embodiment three of this application will not be described accordingly. For details, please refer to the description in specific embodiment two.

[0121] On the other hand, in the embodiments of this application, this application also provides an electrical device, including: a battery pack 100 as in any of the above embodiments, wherein the battery pack 100 serves as a power supply for the electrical device.

[0122] Among them, electrical devices may include, but are not limited to, mobile devices (such as mobile phones, laptops, etc.), 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.

[0123] The above steps are provided only to help understand the method, structure, and core ideas of this application. Those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A battery pack having a first direction and a reference plane perpendicular to the first direction, characterized in that, include: The box body includes a bottom plate and side beams, the side beams being arranged around the edge of the bottom plate, and the bottom plate and side beams cooperating to form an accommodating cavity; Multiple individual battery cells, all of which are disposed within the receiving cavity; and The protective element includes: a plurality of connected protective plates and a plurality of supporting portions, wherein the protective plates are disposed on the side of the base plate near the single battery cell, and the supporting portions are disposed on the side of the protective plates along the first direction, wherein one of the protective plates and the supporting portions is connected to the single battery cell, and the other is connected to the base plate. Along the first direction, the orthographic projections of each of the protective plates on the reference plane and the orthographic projections of each of the support portions on the reference plane are arranged alternately.

2. The battery pack as described in claim 1, characterized in that, The support portion is disposed on the side of the protective plate portion near the individual battery cell, the support portion is connected to the individual battery cell, and the protective plate portion is connected to the base plate.

3. The battery pack as described in claim 2, characterized in that, The battery pack also has a second direction and a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other; The plurality of protective plates extend in the third direction and are arranged along the second direction; the plurality of supporting portions extend in the second direction and are arranged along the third direction; or, The plurality of protective plates extend in the second direction and are arranged along the third direction, and the plurality of supporting portions extend in the third direction and are arranged along the second direction.

4. The battery pack as described in claim 3, characterized in that, Multiple individual cells are arranged along the second direction and the third direction, respectively; Along the first direction, the orthogonal projections of the plurality of individual cells on the reference plane lie within the orthogonal projections of the plurality of protective plates on the reference plane.

5. The battery pack as described in claim 3, characterized in that, The base plate includes: multiple load-bearing parts, with adjacent load-bearing parts fixedly connected, and all load-bearing parts connected to the side beam; Along the first direction, the orthographic projections of each of the protective plates on the reference plane and the orthographic projections of each of the supporting parts on the reference plane are arranged alternately.

6. The battery pack as described in claim 3, characterized in that, The protective plate is provided with a tenon joint and a tenon groove. The tenon joint and the tenon groove are respectively located on two opposite sides of the protective plate along its arrangement direction. The tenon joint on one of two adjacent protective plates is embedded in the tenon groove on the other.

7. The battery pack as described in claim 6, characterized in that, The protective element further includes an adhesive layer disposed between two adjacent protective plates to bond and fix the two adjacent protective plates together.

8. The battery pack as claimed in claim 1, characterized in that, The side beam has a fixing part on the side near the receiving cavity, and the fixing part is located on the side of the protective plate near the single battery cell; The battery pack further includes a locking member, which passes through the fixing part and connects the protective plate part and the fixing part.

9. The battery pack as described in claim 2, characterized in that, The single battery includes: a battery body and an explosion-proof valve, the battery body having a first outer wall facing the base plate, and the explosion-proof valve being disposed on the first outer wall; The protective plate and the two adjacent support portions enclose an exhaust chamber, and the explosion-proof valve is disposed opposite to the exhaust chamber.

10. The battery pack as claimed in claim 9, characterized in that, The protective element further includes: a plurality of exhaust sections, each of which extends along the extension direction of the support section, and is disposed on the side of the protective plate section near the single battery cell. The plurality of exhaust sections are located between two adjacent support sections, and are connected to the first outer wall. The plurality of exhaust sections are spaced apart to divide the exhaust chamber into a plurality of exhaust channels. The explosion-proof valve of each single battery cell is connected to a corresponding exhaust channel.

11. The battery pack as claimed in claim 10, characterized in that, The protective element further includes: a plurality of support portions, each of the support portions being connected to the side of a corresponding exhaust portion near the explosion-proof valve, and each of the support portions being located in a corresponding exhaust channel, and along the first direction, the orthographic projection of the support portion on the reference plane does not coincide with the orthographic projection of the explosion-proof valve on the reference plane; The battery pack further includes: a first partition, disposed on the side of the support near the explosion-proof valve, and along the first direction, the orthographic projection of the explosion-proof valve on the reference plane is located within the orthographic projection of the first partition on the reference plane.

12. The battery pack as claimed in claim 10, characterized in that, The battery pack further includes: a second partition, disposed on the outer surface of the exhaust portion near the exhaust channel, and / or disposed on the outer surface of the protective plate portion near the exhaust channel, wherein the second partition and the explosion-proof valve are spaced apart in the first direction.

13. The battery pack as claimed in claim 10, characterized in that, The battery pack further includes: a first buffer member disposed between the support portion and the first outer wall; and The second buffer is disposed between the exhaust section and the first outer wall.

14. An electrical appliance, characterized in that, include: The battery pack as claimed in any one of claims 1 to 13, wherein the battery pack serves as the power supply for the electrical device.

Images