Battery device and electric device
By designing an annular structure with eccentrically arranged weak and strong areas in the battery device, the problem of premature rupture of the pressure relief component of the battery cell during impact is solved, thereby improving the reliability of the battery cell and the overall reliability of the battery device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-06-26
Smart Images
Figure CN224417964U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Technology
[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Typically, a battery device consists of a casing and multiple battery cells housed within it. Currently, the reliability of battery devices needs further improvement. Utility Model Content
[0003] This application provides a battery device and an electrical device that can reduce the probability of pressure relief components of individual battery cells rupturing and releasing pressure when the battery device is subjected to an impact, thereby improving the reliability of the battery device.
[0004] In a first aspect, embodiments of this application provide an electrical device, comprising: a housing assembly having a first housing wall and a second housing wall located at both ends in a first direction; and a battery cell assembly including a first battery cell group and a second battery cell group, the first battery cell group being close to the first housing wall and the second battery cell group being close to the second housing wall. Both the first and second battery cell groups include a plurality of battery cells arranged along the first direction. Each battery cell includes a pressure relief member, which has an eccentrically arranged weak area configured to be ruptureable for pressure relief. In the first battery cell group, the weak areas of the plurality of battery cells are far from the first housing wall; and in the second battery cell group, the weak areas of the plurality of battery cells are far from the second housing wall.
[0005] In the above technical solution, when the battery device is subjected to a collision impact, the impact force is transmitted to the adjacent first battery cell group through the first box wall of the box assembly, and at the same time, the impact force is transmitted to the adjacent second battery cell group from the second box wall on the other side. Since the weak area of the first battery cell group is far away from the first box wall, and the weak area of the second battery cell group is far away from the second box wall, the weak area of the pressure relief component of each battery cell is far away from the high energy area. This can avoid direct impact, prevent the weak area from breaking prematurely due to external force, reduce the risk of rapid pressure drop in the battery cell leading to greater deformation, lower the failure energy boundary, reduce the probability of battery cell failure, and improve the reliability of the battery cell.
[0006] In some embodiments of this application, the pressure relief component has a reinforcing area, which is connected to the weak area and together forms a ring structure; in the first battery cell group, the reinforcing areas of multiple battery cells are close to the first box wall; in the second battery cell group, the reinforcing areas of multiple battery cells are close to the second box wall.
[0007] In the above technical solution, the ring structure formed by the connected and interlocking reinforced and weak areas facilitates the eccentric arrangement of the weak area. Furthermore, the area between the reinforced and weak areas creates a larger pressure relief port when the pressure relief component is opened, improving the venting and pressure relief effect. When the battery device is subjected to a collision impact, the impact force is transmitted through the first wall of the housing assembly to the adjacent first battery cell group, and simultaneously from the second wall on the other side to the adjacent second battery cell group. Since the reinforced areas of the first and second battery cell groups are all close to the first and second walls, respectively, the reinforced areas are impacted first and can better withstand the impact force, further reducing the risk of premature breakage of the pressure relief component. This also reduces the probability of battery cell deformation and further increases the failure energy boundary, improving the reliability of the battery cells.
[0008] In some embodiments of this application, the length of the reinforcing region is less than or equal to half the circumference of the annular structure.
[0009] In the above technical solution, the length of the reinforcing zone is less than or equal to half the circumference of the ring structure, that is, the length of the weak zone is greater than or equal to the length of the reinforcing zone. This allows the weak zone to have a larger length. When the internal pressure of the battery cell reaches a set threshold, the above structure enables the weak zone to rupture smoothly when the requirements are met. This facilitates the smooth opening of the pressure relief component, releases the pressure of the battery cell, reduces the risk of the battery cell bulging or exploding, and improves the reliability of the battery cell.
[0010] In some embodiments of this application, the ring structure includes an arc segment and a straight segment, there are two straight segments and they are located between the two arc segments, and the two ends of each straight segment are connected to the two arc segments respectively, and the reinforcing area is located on the straight segment.
[0011] In the above technical solution, the reinforcement zone is only set on the straight section, so that the length of the reinforcement zone is not too long, while the weak zone maintains a larger length. When the internal pressure of the battery cell reaches the set threshold, the weak zone has a larger stress surface, which is conducive to normal rupture. This allows the pressure relief component to open normally to release gas and pressure, improves the reliability of the battery cell, and thus improves the reliability of the battery device.
[0012] In some embodiments of this application, the length of the reinforcing region is L1, and the perimeter of the annular structure is L2, wherein 0.1≤L1 / L2≤0.5.
[0013] In the above technical solution, when L1 / L2≥0.1, the reinforcing zone has a suitable length, providing good resistance to frontal impacts and reducing the probability of premature rupture in the weak area, thus mitigating the risk of battery cell deformation due to premature opening of the pressure relief component. When L1 / L2≤0.5, the reinforcing zone is not excessively long, and the weak area has a suitable length, allowing it to rupture normally under certain external forces, releasing the pressure on the battery cell and reducing the probability of bulging or explosion, thereby improving the reliability of the battery device. In other words, by setting the ratio of the length of the reinforcing zone to the circumference of the annular structure within the above range, it is possible to ensure that the reinforcing zone has a good impact load-bearing effect and reinforcement function while also allowing the weak area to rupture normally under high internal pressure in the battery cell. This improves the reliability of the pressure relief component, and consequently, the reliability of the battery cell and the battery device.
[0014] In some embodiments of this application, 0.2 ≤ L1 / L2 ≤ 0.4.
[0015] In the above technical solution, when L1 / L2 ≥ 0.2, the reinforced area has a greater load-bearing capacity, can withstand greater external forces, reduces the risk of large deformation of the battery cell, and improves the reliability of the battery cell. When L1 / L2 ≤ 0.4, the length of the reinforced area is more suitable, and consequently the length of the weak area is also more suitable. Under a smaller external force, the weak area can rupture, releasing the pressure on the battery cell, reducing the risk of bulging or explosion of the battery cell, and improving the reliability of the battery device.
[0016] In some embodiments of this application, the length of the reinforcing region is greater than half the circumference of the annular structure.
[0017] In the above technical solution, the length of the reinforcing zone is greater than half the circumference of the ring structure. The reinforcing zone has a larger length dimension, which enables it to withstand impact loads from more directions, better withstand impact forces, further reduce the risk of premature breakage in the weak area, and further improve the reliability of the battery cells, thereby improving the reliability of the battery device.
[0018] In some embodiments of this application, the length of the reinforcing region is L1, and the perimeter of the annular structure is L2, wherein 0.5 < L1 / L2 ≤ 0.8.
[0019] In the above technical solution, when L1 / L2 > 0.5, the length of the reinforced area is long enough to intercept impact forces, thereby reducing the probability of the weak area being impacted. This results in the pressure relief component having high impact resistance, capable of withstanding greater external forces, and reducing the probability of battery cell deformation. When L1 / L2 ≤ 0.8, the weak area has a certain length and can rupture normally under greater external forces, releasing the pressure on the battery cell, reducing the probability of battery cell bulging or explosion, and improving the reliability of the battery device.
[0020] In some embodiments of this application, 0.5 < L1 / L2 ≤ 0.7.
[0021] In the above technical solution, by further limiting L1 / L2≤0.7, the length of the reinforced area is reduced and the length of the weak area is increased. When the internal pressure of the battery cell reaches the set threshold, the weak area has a larger area to bear the force from inside the battery cell, which is conducive to the rupture of the weak area, thereby ensuring the normal venting and pressure relief of the pressure relief component, improving the reliability of the battery cell, and improving the reliability of the battery device.
[0022] In some embodiments of this application, the pressure relief component is a plate, and the weak area and the reinforcing area are grooves provided on the pressure relief component. The groove depth of the weak area is greater than the groove depth of the reinforcing area. The wall thickness of the pressure relief component is T1, and the remaining wall thickness of the portion of the pressure relief component corresponding to the reinforcing area is T2, wherein 0.46≤T2 / T1≤1.
[0023] In the above technical solution, when T2 / T1≥0.46, the area corresponding to the reinforcing zone of the pressure relief component has a larger residual wall thickness, the area where the reinforcing zone is located has higher strength, can better withstand impact force, and has a lower risk of deformation. This can also alleviate the risk of deformation in the area where the weak zone is located, reduce the probability of the pressure relief component opening prematurely, and improve the reliability of the battery cell.
[0024] In some embodiments of this application, 0.6 ≤ T2 / T1 ≤ 0.9.
[0025] In the above technical solution, by further setting the ratio of the remaining wall thickness of the portion corresponding to the reinforcing area of the pressure relief component to the wall thickness of the pressure relief component within the range of 0.6 to 0.9, the reinforcing area can achieve a better strength enhancement effect, better withstand impact force, reduce the risk of weak areas being subjected to impact force, improve the reliability of the pressure relief component, and thus improve the reliability of the battery cell and battery device.
[0026] In some embodiments of this application, the battery device includes at least two expansion beams arranged along a first direction, with a battery cell assembly disposed between any two adjacent expansion beams.
[0027] In the above technical solution, when the battery device is impacted, the housing assembly transmits the impact force to the expansion beam, thereby forming a high-energy area in the region where the expansion beam is located, which directly acts on the battery cell assembly. The expansion beam can effectively apply a restraining force to multiple battery cells in the battery cell assembly, which can limit the deformation of the battery cell assembly in the first direction, thereby reducing the probability of battery cell damage and deformation, and thus improving the reliability of the battery device.
[0028] In some embodiments of this application, in the first battery cell group, the pressure relief components of multiple battery cells are arranged in a straight line; in the second battery cell group, the pressure relief components of multiple battery cells are arranged in a straight line; or, in the first battery cell group, the pressure relief components of any two adjacent battery cells are staggered; in the second battery cell group, the pressure relief components of any two adjacent battery cells are staggered.
[0029] In the above technical solution, the pressure relief components of multiple battery cells in the first and second battery cell groups are arranged in a straight line in the same direction. This ensures that the structure of each battery cell remains identical, facilitating assembly, reducing assembly difficulty, and improving assembly efficiency. The pressure relief components of multiple battery cells in the first and second battery cell groups are staggered, thus dispersing the pressure relief components and distributing the impact force. This reduces the concentrated force on the pressure relief components when the battery device is impacted, further reducing the force on weak areas and lowering the risk of premature rupture in weak areas, thereby improving the reliability of the battery cells and the battery device.
[0030] In some embodiments of this application, a battery cell includes a housing assembly, and the housing assembly includes multiple housing walls; in a first battery cell group, the pressure relief components of multiple battery cells are disposed on the same housing wall; in a second battery cell group, the pressure relief components of multiple battery cells are disposed on the same housing wall; or, in the first battery cell group, the pressure relief components of any two adjacent battery cells are disposed on different housing walls; in the second battery cell group, the pressure relief components of any two adjacent battery cells are disposed on different housing walls.
[0031] In the above technical solution, all pressure relief components are concentrated on the same shell wall, forming a unified pressure relief direction. This facilitates the design of module-level pressure relief channels, allowing for the rapid removal of high-temperature gases from the battery cells and reducing the risk of expansion or explosion of the battery cells due to internal pressure accumulation. Furthermore, this arrangement simplifies the assembly process and improves assembly efficiency. Placing the pressure relief components of any two adjacent battery cells on different shell walls avoids the risk of localized airflow turbulence or secondary ignition caused by concentrated pressure relief, improves the diffusion efficiency of thermal runaway gases, and prevents flames or high-temperature gases from directly spraying onto the surface of adjacent battery cells, reducing the probability of thermal runaway propagation and improving the reliability of the battery device.
[0032] Secondly, embodiments of this application provide an electrical device, including the battery device described in any of the preceding claims.
[0033] In the above technical solution, the battery device has high reliability, which helps to improve the reliability of the power supply device using the battery device. Attached Figure Description
[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0035] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle;
[0036] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;
[0037] Figure 3 This is a schematic diagram of the internal structure of a battery device provided in some embodiments of this application;
[0038] Figure 4 This is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;
[0039] Figure 5 Front view of a battery cell provided for some embodiments of this application;
[0040] Figure 6 A top view of a battery cell provided in an embodiment of this application;
[0041] Figure 7 Top view of a battery device provided in some embodiments of this application;
[0042] Figure 8A top view of a pressure relief component provided in an embodiment of this application;
[0043] Figure 9 for Figure 8 A sectional view taken along line AA;
[0044] Figure 10 for Figure 9 A magnified view of part I;
[0045] Figure 11 for Figure 9 A magnified view of section II;
[0046] Figure 12 A top view of a pressure relief component provided in some embodiments of this application;
[0047] Figure 13 This is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application.
[0048] icon:
[0049] 100. Battery device;
[0050] 10. Box assembly; 11. First box body; 12. Second box body; 101. First box wall; 102. Second box wall;
[0051] 20. Battery cell assembly; 21. First battery cell group; 22. Second battery cell group; 23. Battery cell; 231. Pressure relief component; 2311. Weak area; 2312. Reinforced area; 2301. Arc-shaped section; 2302. Straight section; 232. Negative terminal; 233. Positive terminal; 234. Housing assembly;
[0052] 30. Expansion beam;
[0053] 1000, Electrical device; 200, Controller; 300, Motor; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation
[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.
[0056] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.
[0057] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.
[0058] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0059] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.
[0060] In this application, "multiple" means two or more (including two).
[0061] In this application, the battery cell may include lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.
[0062] The battery apparatus mentioned in the embodiments of this application can refer to an assembly of one or more battery cells for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar. In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.
[0063] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.
[0064] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing. As an example, the individual battery cell assembly may be a battery module, which can be housed within the housing by securing the battery module to the housing. Alternatively, the individual battery cell assembly may be housed within the housing by directly securing multiple individual battery cells to the housing. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.
[0065] A single battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, while the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.
[0066] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.
[0067] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Typically, a battery device consists of a casing and multiple battery cells housed within it. Currently, the reliability of battery devices needs further improvement.
[0068] When battery devices are used in electrical appliances, the impact force is transmitted to the battery device when the appliance is subjected to an impact, causing reliability issues. For example, in an electric vehicle, the vehicle structure may collapse in a high-speed collision. When the collision speed exceeds 64 km / h, the energy absorption efficiency of the front structure of the battery pack is less than 35%, and the remaining energy is directly transferred to the internal modules, causing the battery cell casing to experience plastic strain exceeding 5%. Dynamic compression tests on battery cells reveal that the compressive force on the battery cell is concentrated at the rigid support surface. Analogously, when battery cells inside the battery pack are compressed, the stress is concentrated in the expansion beam area of the battery cell. This makes it easier for the explosion-proof valve of the battery cell to open, reducing the internal pressure of the battery cell and causing greater deformation under the same energy, thereby lowering the failure energy boundary of the battery cell and affecting the reliability of the battery pack.
[0069] Based on the above considerations, in order to address the problem that when a battery device is impacted, the stress of the internal battery cells is concentrated in the expansion beam area of the battery cells, making it easier for the explosion-proof valves of the battery cells to open, reducing the internal pressure of the battery cells, causing greater deformation under the same energy, thereby lowering the failure energy boundary of the battery cells and affecting the reliability of the battery device, the applicant has designed a battery device including: a housing assembly and a battery cell assembly. The housing assembly has a first housing wall and a second housing wall located at both ends in a first direction; the battery cell assembly includes a first battery cell group and a second battery cell group, with the first battery cell group close to the first housing wall and the second battery cell group close to the second housing wall. Both the first and second battery cell groups include multiple battery cells arranged along the first direction. Each battery cell includes a pressure relief component with an eccentrically arranged weak area, which is configured to be ruptureable for pressure relief; wherein, in the first battery cell group, the weak areas of multiple battery cells are far from the first housing wall; and in the second battery cell group, the weak areas of multiple battery cells are far from the second housing wall.
[0070] In this type of battery device, when the battery device is subjected to a collision impact, the impact force is transmitted through the first box wall of the housing assembly to the adjacent first battery cell group, and at the same time, the impact force is transmitted from the second box wall on the other side to the adjacent second battery cell group. Since the weak area of the first battery cell group is far away from the first box wall, and the weak area of the second battery cell group is far away from the second box wall, the weak area of the pressure relief component of each battery cell is far away from the high-energy area. This avoids direct impact, prevents premature rupture of the weak area due to external force, reduces the risk of rapid pressure drop in the battery cell leading to greater deformation, lowers the failure energy boundary, reduces the probability of battery cell failure, and improves the reliability of the battery cell.
[0071] The battery cells or battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices disclosed in this application can be used to construct such an electrical device, thus expanding the applicability of the battery cells and battery devices.
[0072] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.
[0073] For ease of explanation, the following embodiments use a vehicle as an example to illustrate an electrical device 1000 according to an embodiment of this application. Please refer to... Figure 1 , Figure 1 The electrical device 1000 provided in some embodiments of this application is a structural schematic diagram of a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.
[0074] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.
[0075] Reference Figure 2 , Figure 2 This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing assembly 10 and a plurality of battery cells 23, which are housed within the housing assembly 10. The housing assembly 10 provides assembly space for the battery cells 23, and the housing assembly 10 can adopt various structures. In some embodiments, the housing assembly 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cells 23. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box assembly 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as cylinder, cuboid, etc.
[0076] In the battery device 100, multiple battery cells 23 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 23 can be connected in both series and parallel configurations. Multiple battery cells 23 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of multiple battery cells 23 is housed within the housing assembly 10. Alternatively, the battery device 100 can also consist of multiple battery cells 23 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing assembly 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 23.
[0077] Please refer to Figure 2 , Figure 2 The following is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes multiple rows of battery cells 23, which are arranged along the length of the housing assembly 10. Each row of battery cells 23 includes a plurality of battery cells 23 arranged along the width of the housing assembly 10; or, the multiple rows of battery cells 23 are arranged along the width of the housing assembly 10, and each row of battery cells 23 includes a plurality of battery cells 23 arranged along the length of the housing assembly 10.
[0078] Each battery cell 23 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell 23 that can be recharged after discharge to activate its active materials and continue to be used. It can also 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, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited in this regard. The battery cell 23 can be cylindrical, flat, cuboid, or other shapes. For example, in... Figure 2 In the middle, the shape of the battery cell 23 is a cuboid.
[0079] Reference Figures 3 to 6This application provides a battery device 100, including a housing assembly 10 and a battery cell assembly 20. The housing assembly 10 has a first housing wall 101 and a second housing wall 102 located at both ends in a first direction X. The battery cell assembly 20 includes a first battery cell group 21 and a second battery cell group 22. The first battery cell group 21 is close to the first housing wall 101, and the second battery cell group 22 is close to the second housing wall 102. Both the first battery cell group 21 and the second battery cell group 22 include a plurality of battery cells 23 arranged along the first direction X. Each battery cell 23 includes a pressure relief member 231. The pressure relief member 231 has an eccentrically arranged weak area 2311, which is configured to be ruptureable for pressure relief. In the first battery cell group 21, the weak areas 2311 of the plurality of battery cells 23 are far from the first housing wall 101. In the second battery cell group 22, the weak areas 2311 of the plurality of battery cells 23 are far from the second housing wall 102.
[0080] The housing assembly 10 can refer to a structure used to house and protect the internal components of the battery cell 23. The shape of the housing assembly 10 can be, but is not limited to, a cuboid, a cube, a cylinder, etc., and the material can be, but is not limited to, metal materials (such as aluminum, stainless steel, etc.), plastic materials (such as polypropylene, polyamide, polyphenylene sulfide, etc.), composite materials (such as carbon fiber reinforced composite materials, aluminum-plastic film, etc.), or other materials resistant to electrolyte corrosion, etc.
[0081] "First direction X" can be, but is not limited to, one of the length direction, width direction, or height direction of the housing assembly 10. For example, referring to... Figure 4 The first direction X is the length direction of the housing assembly 10. The first housing wall 101 and the second housing wall 102 can refer to the two wall panels that form the housing assembly 10.
[0082] In the first direction X of the housing assembly 10, the first housing wall 101 may be located at the end near the first battery cell group 21, and the second housing wall 102 may be located at the end near the second battery cell group 22.
[0083] The battery cell assembly 20 can refer to a component composed of a first battery cell group 21 and a second battery cell group 22. Both the first battery cell group 21 and the second battery cell group 22 include a plurality of battery cells 23 arranged along a first direction X. The number of battery cells 23 in the first battery cell group 21 and the second battery cell group 22 can be, but is not limited to, two, three, four, five, six, seven, eight, nine, etc. Optionally, the number of battery cells 23 in the first battery cell group 21 and the number of battery cells 23 in the second battery cell group 22 can be equal or unequal.
[0084] The pressure relief component 231 can refer to a part or structure that can release the internal pressure of the battery cell 23, and can be, but is not limited to, an explosion-proof valve, a diaphragm, or a groove formed on the outer shell of the battery cell 23. The weak area 2311 can refer to a relatively weak area on the pressure relief component 231. When the internal pressure of the battery cell 23 reaches a set threshold, the weak area 2311 is more likely to rupture, causing the pressure relief component 231 to open as a whole, thereby realizing the venting and pressure relief of the pressure relief component 231.
[0085] The weak area 2311 is eccentrically arranged on the pressure relief component 231, meaning that the weak area 2311 is located away from the center of the pressure relief component 231. For example, the pressure relief component 231 is an explosion-proof valve plate, and the explosion-proof valve plate has grooves, with all or part of the grooves forming the weak area 2311. The grooves can be annular, straight, spiral, elliptical, etc.
[0086] Optionally, multiple battery cells 23 of the first battery cell group 21 and the second battery cell group 22 can be connected in parallel, so that each battery cell 23 has the same structure.
[0087] Optionally, refer to Figure 4 The multiple battery cells 23 of the first battery cell group 21 and the second battery cell group 22 can also be connected in series. The multiple battery cells 23 of the first battery cell group 21 and the second battery cell group 22 can be divided into two categories, for example, type A battery cells and type B battery cells. Optionally, the battery cell 23 may include a negative electrode post 232 and a positive electrode post 233, as shown in the figure. Figure 6 In a Class A battery cell, the weak point 2311 of the pressure relief component 231 is located on one side of the line connecting the negative electrode post 232 and the positive electrode post 233, as shown in the reference. Figure 7 In a Class B battery cell, the weak point 2311 of the pressure relief component 231 is located on the other side of the line connecting the negative terminal 232 and the positive terminal 233. Therefore, in the battery cell assembly 20, the multiple battery cells 23 of the first battery cell group 21 can be arranged in an ABAB… pattern, and the multiple battery cells 23 of the second battery cell group 22 can be arranged in a BABA… pattern.
[0088] In the above technical solution, when the battery device 100 is subjected to a collision impact, the impact force is transmitted through the first box wall 101 of the box assembly 10 to the adjacent first battery cell group 21, and at the same time, the impact force is transmitted from the second box wall 102 on the other side to the adjacent second battery cell group 22. Since the weak area 2311 of the first battery cell group 21 is far away from the first box wall 101, and the weak area 2311 of the second battery cell group 22 is far away from the second box wall 102, the weak area 2311 of the pressure relief component 231 of each battery cell 23 is far away from the high energy area (first box wall 101 and second box wall 102). This can avoid direct impact, prevent the weak area 2311 from breaking prematurely due to external force, reduce the risk of rapid pressure drop in the battery cell 23 leading to greater deformation, reduce the failure energy boundary, reduce the probability of battery cell 23 failure, and improve the reliability of battery cell 23.
[0089] In some embodiments of this application, reference is made to Figure 4 , Figure 6 , Figure 7 and Figure 8 The pressure relief component 231 is provided with a reinforcing area 2312, which is connected to the weak area 2311 and together forms a ring structure. In the first battery cell group 21, the reinforcing areas 2312 of multiple battery cells 23 are close to the first box wall 101. In the second battery cell group 22, the reinforcing areas 2312 of multiple battery cells 23 are close to the second box wall 102.
[0090] The reinforced region 2312 can refer to the area in the pressure relief component 231 where the structural strength is greater than that of the weak region 2311, and it can withstand greater external forces than the weak region 2311. The reinforced region 2312 and the weak region 2311 are connected and together form a ring structure, which can be, but is not limited to, a circular ring, a square ring, an elliptical ring, etc. For example, refer to... Figure 8 The ring structure is runway-shaped. The reinforcement zone 2312 can be a straight edge of the runway shape, and the weak zone 2311 is another straight edge and two curved edges of the runway shape.
[0091] In the above technical solution, the ring structure formed by the connection of the reinforcing zone 2312 and the weak zone 2311 can, on the one hand, make it easier to achieve the eccentric arrangement of the weak zone 2311, and on the other hand, the area between the reinforcing zone 2312 and the weak zone 2311 can form a larger pressure relief port when the pressure relief component 231 is opened, which is beneficial to improving the exhaust pressure relief effect. When the battery device 100 is subjected to a collision impact force, the impact force is transmitted through the first housing wall 101 to the adjacent first battery cell group 21, and at the same time, the impact force is transmitted from the second housing wall 102 on the other side to the adjacent second battery cell group 22. Since the reinforcement areas 2312 of the first battery cell group 21 are close to the first housing wall 101, and the reinforcement areas 2312 of the second battery cell group 22 are close to the second housing wall 102, the reinforcement areas 2312 are subjected to the impact force first, and can better withstand the impact force, reduce the stress on the weak area 2311, further reduce the risk of premature breakage of the pressure relief component 231, and thus reduce the probability of deformation of the battery cell 23, further improve the failure energy boundary, and improve the reliability of the battery cell 23.
[0092] In some embodiments of this application, reference is made to Figure 8 The reinforced area 2312 and the weak area 2311 are connected and together form an elliptical structure. In the above technical solution, the elliptical structure can be understood as a "racetrack-shaped" structure. The grooves with this structure have smoother curve transitions, which can more evenly distribute the stress generated by internal pressure compared to circles or other shapes, reducing the probability of failure of the pressure relief component 231 and improving the reliability of the pressure relief component 231.
[0093] In some embodiments of this application, reference is made to Figure 7 The length of the reinforced zone 2312 is less than or equal to one-half of the circumference of the ring structure.
[0094] In the above technical solution, the length of the reinforcing region 2312 is less than or equal to half the circumference of the annular structure, that is, the length of the weak region 2311 is greater than or equal to the length of the reinforcing region 2312, thus the weak region 2311 has a larger length. When the internal pressure of the battery cell 23 reaches a set threshold, the above structure enables the weak region 2311 to rupture smoothly when the requirement is met, which is conducive to the smooth opening of the pressure relief component 231, releasing the pressure of the battery cell 23, reducing the risk of bulging or explosion of the battery cell 23, and improving the reliability of the battery cell 23.
[0095] In some embodiments of this application, reference is made to Figure 8 The ring structure may include an arc segment 2301 and a straight segment 2302. There are two straight segments 2302 and they are located between the two arc segments 2301. The two ends of each straight segment 2302 are connected to the two arc segments 2301 respectively. The reinforcing area 2312 is located on the straight segment 2302.
[0096] The ring structure of the above technical solution is runway-shaped. The reinforcing zone 2312 is located on a straight section 2302. The straight section 2302 can be entirely the reinforcing zone 2312, or a part of it can be the reinforcing zone 2312. The remaining part of the ring structure can form the weak zone 2311, or a part of the remaining part of the ring structure can form the weak zone 2311.
[0097] For example, another straight segment 2302 of the ring structure constitutes a weak area 2311. As another example, another straight segment 2302 of the ring structure and the two curved segments 2301 on both sides constitute a weak area 2311. Yet another example, another straight segment 2302 of the ring structure and half of the two curved segments 2301 on both sides together constitute a weak area 2311.
[0098] In the above technical solution, the reinforcing zone 2312 is only set on the straight section 2302. This ensures that the length of the reinforcing zone 2312 is not too long, while the weak zone 2311 maintains a larger length. When the internal pressure of the battery cell 23 reaches the set threshold, the weak zone 2311 has a larger stress surface, which is conducive to normal rupture. This allows the pressure relief component 231 to open normally to release air and pressure, improving the reliability of the battery cell 23 and thus improving the reliability of the battery device 100.
[0099] In some embodiments of this application, the entire straight section 2302 is a reinforced region 2312, and another straight section 2302 and two arc-shaped sections 2301 together constitute a weak region 2311. With this design, when the battery device 100 is impacted, the straight section 2302 containing the reinforced region 2312 can directly receive the impact, while the section containing the reinforced region 2312 will not be directly impacted. This reduces the probability of the weak region 2311 rupturing when the battery device 100 is impacted, reduces the risk of premature opening of the pressure relief component 231, and thus improves the reliability of the battery cell 23 and the overall reliability of the battery device 100.
[0100] In some embodiments of this application, reference is made to Figure 8 The length of the reinforcing zone 2312 is L1, and the perimeter of the ring structure is L2, where 0.1≤L1 / L2≤0.5.
[0101] See the length L1 of reinforced region 2312. Figure 8It is understandable that L1 / L2 can be, but is not limited to, 0.1, 0.2, 0.3, 0.4, 0.5, etc. If L1 / L2 is less than 0.1, the reinforcing area 2312 occupies a smaller proportion of the circumference of the annular structure, and the size of the reinforcing area 2312 is also smaller, resulting in a lower reinforcing effect. It cannot better withstand the frontal impact transmitted from the housing assembly 10, and the effect of improving the premature rupture of the weak area 2311 is also poor. If L1 / L2 is greater than 0.5, the reinforcing area 2312 occupies a larger proportion of the circumference of the annular structure, which leads to a smaller proportion of the weak area 2311, affecting the length of the weak area 2311. When the internal pressure of the battery cell 23 reaches the set threshold and requires normal venting and pressure relief, the probability of normal rupture of the weak area 2311 is reduced, which is not conducive to the normal operation of the pressure relief component 231.
[0102] In the above technical solution, when L1 / L2≥0.1, the reinforcing region 2312 has a suitable length and good resistance to frontal impact, which can reduce the probability of premature rupture of the weak region 2311 and reduce the risk of deformation of the battery cell 23 due to premature opening of the pressure relief component 231. When L1 / L2≤0.5, the reinforcing region 2312 is not too long, and the weak region 2311 has a suitable length. Under a certain external force, the weak region 2311 can rupture normally, releasing the pressure of the battery cell 23 and reducing the probability of bulging or explosion of the battery cell 23, thereby improving the reliability of the battery device 100. In other words, by setting the ratio of the length L1 of the reinforcing region 2312 to the circumference L2 of the annular structure within the above range, it is possible to ensure that the reinforcing region 2312 has a good impact load resistance and reinforcement effect, while also ensuring that the weak region 2311 can rupture normally when the internal pressure of the battery cell 23 is high. This improves the reliability of the pressure relief component 231, and thus improves the reliability of the battery cell 23 and the battery device 100.
[0103] In some embodiments of this application, 0.2 ≤ L1 / L2 ≤ 0.4. It is understood that L1 / L2 can be, but is not limited to, 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, 0.32, 0.34, 0.36, 0.38, 0.4, etc.
[0104] In the above technical solution, when L1 / L2≥0.2, the reinforcing region 2312 further possesses greater load-bearing capacity, can withstand greater external forces, reduces the risk of large deformation of the battery cell 23, and improves the reliability of the battery cell 23. When L1 / L2≤0.4, the length of the reinforcing region 2312 is more suitable, and consequently, the length of the weak region 2311 is more suitable. Under a smaller external force, the weak region 2311 can rupture, releasing the pressure on the battery cell 23, reducing the risk of bulging or explosion of the battery cell 23, and improving the reliability of the battery device 100.
[0105] In some embodiments of this application, reference is made to Figure 8 The length of reinforced zone 2312 is greater than half the circumference of the ring structure. Figure 9 For example, more than half the length of the arc-shaped segments 2301 on both sides and a straight segment 2302 together constitute the reinforcing zone 2312, while the rest of the ring structure constitutes the weak zone 2311.
[0106] Similarly, refer to Figure 9 The two farthest endpoints of the ring structure in the second direction Y are both located on the reinforcement zone 2312, and are combined with Figure 3 The reinforced area 2312 can not only withstand the frontal impact load of the housing assembly 10 in the first direction X, but also effectively resist the impact force when the housing assembly 10 is subjected to the lateral impact load in the second direction Y, reducing the risk of premature rupture of the weak area 2311 and further improving the reliability of the pressure relief component 231. The second direction Y can be a direction perpendicular to the first direction X, and the second direction Y and the first direction X can be, but are not limited to, any of the length, width, and height directions of the housing assembly 10.
[0107] In the above technical solution, the length of the reinforcing region 2312 is greater than half the circumference of the annular structure. The reinforcing region 2312 has a larger length dimension, which enables the reinforcing region 2312 to withstand impact loads from more directions, better withstand impact forces, further reduce the risk of premature rupture of the weak region 2311, and further improve the reliability of the battery cell 23, thereby improving the reliability of the battery device 100.
[0108] In some embodiments of this application, reference is made to Figure 8 The length of the reinforcing zone 2312 is L1, and the perimeter of the ring structure is L2, where 0.5 < L1 / L2 ≤ 0.8.
[0109] It is understandable that L1 / L2 can be, but is not limited to, 0.51, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, etc.
[0110] In the above technical solution, when L1 / L2 > 0.5, the length of the reinforcing zone 2312 is sufficiently long, providing greater impact resistance and reducing the probability of the weak zone 2311 being impacted. This results in the pressure relief component 231 having high impact resistance, capable of withstanding greater external forces, and reducing the probability of deformation of the battery cell 23. When L1 / L2 ≤ 0.8, the weak zone 2311 has a certain length and can rupture normally under greater external forces, releasing the pressure on the battery cell 23, reducing the probability of bulging or explosion of the battery cell 23, and improving the reliability of the battery device 100.
[0111] In some embodiments of this application, 0.5 < L1 / L2 ≤ 0.7. It is understood that L1 / L2 can be, but is not limited to, 0.5, 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.64, 0.66, 0.68, 0.7, etc.
[0112] In the above technical solution, by further limiting L1 / L2≤0.7, the length of the reinforced region 2312 is reduced and the length of the weak region 2311 is increased. When the internal pressure of the battery cell 23 reaches the set threshold, the weak region 2311 has a larger area to bear the force from inside the battery cell 23, which is conducive to the rupture of the weak region 2311, thereby ensuring the normal venting and pressure relief of the pressure relief component 231, improving the reliability of the battery cell 23, and improving the reliability of the battery device 100.
[0113] In some embodiments of this application, reference is made to Figures 9 to 11 The pressure relief component 231 is a plate. The weak area 2311 and the reinforcing area 2312 are grooves provided on the pressure relief component 231. The groove depth of the weak area 2311 is greater than the groove depth of the reinforcing area 2312. The wall thickness of the pressure relief component 231 is T1, and the remaining wall thickness of the part of the pressure relief component 231 corresponding to the reinforcing area 2312 is T2, where 0.46≤T2 / T1≤1.
[0114] The weak zone 2311, with its large groove depth on the pressure relief component 231, can reduce the structural strength and make it more prone to cracking. The reinforcing zone 2312, by forming shallow grooves on the pressure relief component 231, can act like a concave rib, changing the cross-sectional shape of the pressure relief component 231 and thus enhancing the structural strength.
[0115] T2 / T1 can be, but is not limited to, 0.46, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. If T2 / T1 is less than 0.46, the groove depth of the reinforcing zone 2312 is larger, resulting in a smaller residual wall thickness. The weakening effect on the strength of the pressure relief component 231 is greater than the strengthening effect.
[0116] In the above technical solution, when T2 / T1≥0.46, the area of the pressure relief component 231 corresponding to the reinforcement area 2312 has a large residual wall thickness, the area where the reinforcement area 2312 is located has high strength, can better withstand impact force, and has a small risk of deformation. This can also alleviate the risk of deformation in the area where the weak area 2311 is located, reduce the probability of the pressure relief component 231 opening prematurely, and improve the reliability of the battery cell 23.
[0117] In some embodiments of this application, 0.6 ≤ T2 / T1 ≤ 0.9. T2 / T1 can be, but is not limited to, 0.6, 0.64, 0.68, 0.7, 0.74, 0.78, 0.8, 0.84, 0.88, 0.9, etc.
[0118] When T2 / T1 ≥ 0.6, the area of the pressure relief component 231 corresponding to the reinforcing region 2312 has a large residual thickness, the reinforcing region 2312 has greater strength, can withstand greater external forces, reduces the probability of deformation of the battery cell 23, and improves the reliability of the battery cell 23. When T2 / T1 < 0.9, the reinforcing region 2312 has shallower indentations, which can form a structure similar to a reinforcing rib, significantly improving the strength of the pressure relief component 231, reducing the probability of deformation of the battery cell 23, and improving the reliability of the battery cell 23.
[0119] In the above technical solution, by further setting the ratio of the remaining wall thickness of the portion of the pressure relief component 231 corresponding to the reinforcing area 2312 to the wall thickness of the pressure relief component 231 in the range of 0.6 to 0.9, the reinforcing area 2312 can achieve a better strength enhancement effect, better withstand impact force, reduce the risk of the weak area 2311 being subjected to impact force, improve the reliability of the pressure relief component 231, and thus improve the reliability of the battery cell 23 and the battery device 100.
[0120] In some embodiments of this application, reference is made to Figure 12 The weak area 2311 is a cross-shaped groove on the pressure relief component 231, and it is located away from the center of the pressure relief component 231. It can be understood that in the above technical solution, the weak area 2311 is a non-ring structure, which can also play the role of breaking and opening the pressure relief component 231.
[0121] In some embodiments of this application, reference is made to Figure 3 The battery device 100 includes at least two expansion beams 30 arranged along a first direction X, and a battery cell assembly 20 is provided between any two adjacent expansion beams 30.
[0122] The expansion beam 30 can refer to a component that constrains the deformation of the battery cell assembly 20 along the first direction X. The number of expansion beams 30 can be, but is not limited to, two, three, four, five, six, etc. The expansion beam 30 can be, but is not limited to, circular, rectangular, irregular shapes, etc.
[0123] In the above technical solution, when the battery device 100 is impacted, the housing assembly 10 transmits the impact force to the expansion beam 30, thereby forming a high-energy region in the area where the expansion beam 30 is located, which directly acts on the battery cell assembly 20. The expansion beam 30 can effectively apply a restraining force to the multiple battery cells 23 of the battery cell assembly 20, which can limit the deformation of the battery cell assembly 20 in the first direction X, thereby reducing the probability of damage to the battery cells 23 and the chance of deformation of the battery cells 23, thus improving the reliability of the battery device 100.
[0124] In some embodiments of this application, reference is made to Figure 4 and Figure 13 In the first battery cell group 21, the pressure relief components 231 of multiple battery cells 23 are arranged in a straight line; in the second battery cell group 22, the pressure relief components 231 of multiple battery cells 23 are arranged in a straight line; or, in the first battery cell group 21, the pressure relief components 231 of any two adjacent battery cells 23 are staggered; in the second battery cell group 22, the pressure relief components 231 of any two adjacent battery cells 23 are staggered.
[0125] Reference Figure 4 In the first battery cell group 21, the pressure relief components 231 of multiple battery cells 23 are arranged in a straight line; in the second battery cell group 22, the pressure relief components 231 of multiple battery cells 23 are arranged in a straight line.
[0126] Reference Figure 13 In the first battery cell group 21, the pressure relief components 231 of any two adjacent battery cells 23 are staggered; in the second battery cell group 22, the pressure relief components 231 of any two adjacent battery cells 23 are staggered. The multiple battery cells 23 in the first battery cell group 21 and the second battery cell group 22 can be all staggered, or partially staggered with some cells arranged along the same straight line.
[0127] In the above technical solution, the pressure relief components 231 of multiple battery cells 23 in the first battery cell group 21 and the second battery cell group 22 are arranged in a straight line in the same direction (e.g., all along the first direction X). This ensures that the structure of each battery cell 23 is identical, facilitating assembly, reducing assembly difficulty, and improving assembly efficiency. The pressure relief components 231 of multiple battery cells 23 in the first battery cell group 21 and the second battery cell group 22 are staggered, thereby dispersing the pressure relief components 231 and dispersing the impact force. This reduces the concentrated force on the pressure relief components 231 when the battery device 100 is impacted, further reducing the force on the weak area 2311, thereby reducing the risk of premature rupture of the weak area 2311 and improving the reliability of the battery cells 23 and the battery device 100.
[0128] In some embodiments of this application, reference is made to Figure 5 and Figure 6 Each battery cell 23 includes a housing assembly 234, which includes multiple housing walls. In the first battery cell group 21, the pressure relief components 231 of the multiple battery cells 23 are located on the same housing wall. In the second battery cell group 22, the pressure relief components 231 of the multiple battery cells 23 are located on the same housing wall. Alternatively, in the first battery cell group 21, the pressure relief components 231 of any two adjacent battery cells 23 are located on different housing walls. In the second battery cell group 22, the pressure relief components 231 of any two adjacent battery cells 23 are located on different housing walls.
[0129] In the first battery cell group 21 and the second battery cell group 22, the pressure relief components 231 of multiple battery cells 23 are provided on the same shell wall. Optionally, the pressure relief components 231 of multiple battery cells 23 may be, but are not limited to, provided on the top shell wall, bottom shell wall, side small shell walls, etc. of the housing assembly 234. For example, refer to Figure 4 and Figure 13 The pressure relief components 231 of multiple battery cells 23 are provided on the shell wall of the housing assembly 234 in the third direction Z. The third direction Z can be a direction perpendicular to the first direction X and the second direction Y mentioned above.
[0130] In the first battery cell group 21 and the second battery cell group 22, the pressure relief components 231 of the multiple battery cells 23 are provided on different shell walls. Optionally, the pressure relief components 231 of the multiple battery cells 23 may be partially provided on the shell wall of the housing assembly 234 in the third direction Z, and another part may be provided on the shell wall of the housing assembly 234 in the second direction Y.
[0131] In the above technical solution, all pressure relief components 231 are concentrated on the same shell wall, forming a unified pressure relief direction. This facilitates the design of module-level pressure relief channels and allows for the rapid exhaust of high-temperature gas from the battery cell 23, reducing the risk of expansion or explosion of the battery cell 23 due to internal pressure accumulation. Furthermore, this arrangement simplifies the assembly process and improves assembly efficiency. Placing the pressure relief components 231 of any two adjacent battery cells 23 on different shell walls avoids the risk of localized airflow turbulence or secondary ignition caused by concentrated pressure relief, improves the diffusion efficiency of thermal runaway gas, and prevents flames or high-temperature gas from directly spraying onto the surface of adjacent battery cells 23, reducing the probability of thermal runaway propagation and improving the reliability of the battery device 100.
[0132] Reference Figure 1 This application provides an electrical device 1000, including the battery device 100 of any of the preceding embodiments. In the above technical solutions, since the battery device 100 has high reliability, it is beneficial to improve the reliability of the electrical device 1000 using the battery device 100.
[0133] The following reference Figures 3 to 11 A battery device 100 provided according to an embodiment of this application includes: a housing assembly 10, a battery cell assembly 20, and an expansion beam 30.
[0134] The housing assembly 10 has a first housing wall 101 and a second housing wall 102 located at both ends in a first direction X, where the first direction X is the length direction of the housing assembly 10.
[0135] There are two expansion beams 30 arranged at intervals along the first direction X. One of the two expansion beams 30 is close to the first box wall 101, and the other is close to the second box wall 102.
[0136] The battery cell assembly 20 is disposed between two expansion beams 30 and includes a first battery cell group 21 and a second battery cell group 22. The first battery cell group 21 is close to the first housing wall 101, and the second battery cell group 22 is close to the second housing wall 102. Both the first battery cell group 21 and the second battery cell group 22 include six battery cells 23 arranged in a straight line along the first direction X. In the first battery cell group 21, the weakest areas 2311 of the six battery cells 23 are far away from the first housing wall 101; in the second battery cell group 22, the weakest areas 2311 of the six battery cells 23 are far away from the second housing wall 102.
[0137] The battery cell 23 includes a pressure relief component 231, a negative terminal post 232, a positive terminal post 233, and a housing assembly 234. The pressure relief component 231 is a plate, and the pressure relief section has a reinforcing area 2312 and a weak area 2311. The weak area 2311 and the reinforcing area 2312 are grooves provided on the pressure relief component 231. The groove depth of the weak area 2311 is greater than the groove depth of the reinforcing area 2312. The reinforcing area 2312 and the weak area 2311 are connected and together form a ring structure. The ring structure is racetrack-shaped and includes an arc segment 2301 and a straight segment 2302. There are two straight segments 2302 and they are located between two arc segments 2301. The two ends of each straight segment 2302 are connected to the two arc segments 2301 respectively. The reinforcing area 2312 is provided on the straight segment 2302. The reinforcing region 2312 of each battery cell 23 in the first battery cell group 21 is located near the first housing wall 101, and the reinforcing region 2312 of each battery cell 23 in the second battery cell group 22 is located near the second housing wall 102.
[0138] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The above are merely preferred embodiments of this application and are not intended to limit the application. For those skilled in the art, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A battery device, characterized in that, include: The housing assembly has a first housing wall and a second housing wall located at both ends in a first direction; A battery cell assembly includes a first battery cell group and a second battery cell group. The first battery cell group is located near a first housing wall, and the second battery cell group is located near a second housing wall. Both the first and second battery cell groups include a plurality of battery cells arranged along a first direction. Each battery cell includes a pressure relief component with an eccentrically arranged weak region configured to rupture and relieve pressure. In the first battery cell group, the weak regions of the plurality of battery cells are located away from the first housing wall; in the second battery cell group, the weak regions of the plurality of battery cells are located away from the second housing wall.
2. The battery device according to claim 1, characterized in that, The pressure relief component has a reinforced area, which is connected to the weak area and together forms a ring structure; in the first battery cell group, the reinforced areas of multiple battery cells are close to the first casing wall; in the second battery cell group, the reinforced areas of multiple battery cells are close to the second casing wall.
3. The battery device according to claim 2, characterized in that, The length of the reinforced zone is less than or equal to one-half the circumference of the ring structure.
4. The battery device according to claim 3, characterized in that, The annular structure includes an arc segment and a straight segment. There are two straight segments, which are located between the two arc segments. The two ends of each straight segment are connected to the two arc segments respectively. The reinforcing area is located on the straight segment.
5. The battery device according to claim 3, characterized in that, The length of the reinforcing zone is L1, and the circumference of the annular structure is L2, wherein 0.1≤L1 / L2≤0.
5.
6. The battery device according to claim 5, characterized in that, 0.2≤L1 / L2≤0.
4.
7. The battery device according to claim 2, characterized in that, The length of the reinforced area is greater than one-half of the circumference of the ring structure.
8. The battery device according to claim 7, characterized in that, The length of the reinforcing zone is L1, and the circumference of the annular structure is L2, wherein 0.5 < L1 / L2 ≤ 0.
8.
9. The battery device according to claim 8, characterized in that, 0.5 < L1 / L2 ≤ 0.
7.
10. The battery device according to claim 2, characterized in that, The pressure relief component is a plate, and the weak area and the reinforcing area are grooves provided on the pressure relief component. The groove depth of the weak area is greater than the groove depth of the reinforcing area. The wall thickness of the pressure relief component is T1, and the remaining wall thickness of the portion of the pressure relief component corresponding to the reinforcing area is T2, wherein 0.46≤T2 / T1≤1.
11. The battery device according to claim 10, characterized in that, 0.6≤T2 / T1≤0.
9.
12. The battery device according to claim 1, characterized in that, The battery device includes at least two expansion beams arranged along the first direction, and the battery cell assembly is disposed between any two adjacent expansion beams.
13. The battery device according to any one of claims 2 to 12, characterized in that, In the first battery cell group, the pressure relief components of the plurality of battery cells are arranged in a straight line; in the second battery cell group, the pressure relief components of the plurality of battery cells are arranged in a straight line. Alternatively, in the first battery cell group, the pressure relief components of any two adjacent battery cells are staggered; in the second battery cell group, the pressure relief components of any two adjacent battery cells are staggered.
14. The battery device according to any one of claims 2 to 12, characterized in that, The battery cell includes a housing assembly, which includes multiple housing walls; in the first battery cell group, the pressure relief components of the multiple battery cells are disposed on the same housing wall; in the second battery cell group, the pressure relief components of the multiple battery cells are disposed on the same housing wall. Alternatively, in the first battery cell group, the pressure relief components of any two adjacent battery cells are located on different shell walls; in the second battery cell group, the pressure relief components of any two adjacent battery cells are located on different shell walls.
15. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 14.