Battery device and electric device

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a battery device and a power utilization device, and the battery device comprises a box body, a partition plate, a battery monomer assembly and a blocking piece. The partition plate is arranged in the box body and divides the inner cavity into a first cavity body and a second cavity body; the partition plate comprises a first plate body, a second plate body and a first rib, and a third cavity and a fourth cavity are formed in the partition plate; the battery monomer assembly is arranged in the first cavity and comprises a first battery monomer and a second battery monomer which are adjacent to each other and are respectively provided with a first pressure relief mechanism and a second pressure relief mechanism; a first through hole and a second through hole corresponding to the two pressure relief mechanisms are formed in the partition plate, and the first rib is located between the two through holes; the partition plate is further provided with a third through hole penetrating through the first rib, and a first opening and a second opening are formed. And the blocking part of the blocking piece is arranged in the third through hole and covers at least one opening, so that the emission can be prevented from moving between the third cavity and the fourth cavity, the risk that the battery monomers are in lap joint and conduction due to particulate matters is reduced, and the reliability of the device is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery device and a power utilization device. BACKGROUND

[0002] The battery device is widely applied to various power utilization fields such as new energy vehicles and energy storage power stations. In actual application, the battery device includes a plurality of battery monomers arranged in a compact group to improve the energy density of the battery device.

[0003] To improve the use reliability of the battery monomer, the battery monomer is provided with a pressure relief mechanism. When the battery monomer is abnormal due to overcharging, internal short circuit or the like, the pressure relief mechanism is actuated in time to release the internal pressure and reduce the risk of explosion of the battery monomer. However, in the structure of the group of a plurality of battery monomers, if the pressure relief mechanism of one battery monomer is actuated, the particulate matter sprayed therefrom will spread to the periphery, and it is easy to form a conductive lap joint between the battery monomer and other battery monomers, thereby causing problems such as short circuit, sparking and arc between the battery monomers. Such problems will directly lead to the rapid spread of thermal runaway in the battery device, which is not conducive to improving the overall use reliability of the battery device. Therefore, how to reduce the possibility of the spread of thermal runaway in the battery device has become an important research content to be solved in the battery field.

[0004] The above statements are only used to provide background information related to the application and do not necessarily constitute the prior art. SUMMARY

[0005] The purpose of the embodiments of the application is to provide a battery device and a power utilization device, which reduce the risk of conductive lap joint of the particulate matter sprayed between the battery monomers.

[0006] The technical solutions adopted by the embodiments of the application are as follows: In a first aspect, a battery device is provided, which includes a box body, a partition plate, a battery cell assembly, and a blocking piece. The partition plate is arranged in the box body and is configured to divide an inner cavity of the box body into a first cavity and a second cavity. The partition plate includes a first plate body and a second plate body arranged in parallel, and a first rib connected between the first plate body and the second plate body. The first plate body is located between the second plate body and the first cavity. The first plate body and the second plate body form a third cavity and a fourth cavity therebetween. The first rib separates the third cavity and the fourth cavity. The battery cell assembly is arranged in the first cavity. The battery cell assembly includes a plurality of battery cells, which include a first battery cell and a second battery cell. The first battery cell is provided with a first pressure relief mechanism. The partition plate is provided with a first through hole, which penetrates the first plate body and the second plate body and is in communication with the third cavity. The first pressure relief mechanism is arranged towards the second cavity through the first through hole, so that the first pressure relief mechanism can relieve pressure to the third cavity and the second cavity. The second battery cell is provided with a second pressure relief mechanism. The partition plate is provided with a second through hole, which penetrates the first plate body and the second plate body and is in communication with the fourth cavity. The second pressure relief mechanism is arranged towards the second cavity through the second through hole, so that the second pressure relief mechanism can relieve pressure to the fourth cavity and the second cavity. The first rib is located between the first through hole and the second through hole. The partition plate is provided with a third through hole for a connecting component to pass through. The third through hole penetrates the first plate body, the second plate body, and the first rib, so that the partition plate forms a first opening that connects the third cavity and the third through hole, and forms a second opening that connects the fourth cavity and the third through hole. The blocking piece is connected with the partition plate. The blocking piece includes a blocking portion, which covers at least part of the first opening and / or at least part of the second opening.

[0007] By adopting the technical scheme of the embodiment, when the first battery cell is in thermal runaway, the first pressure relief mechanism is actuated, and the released exhaust diffuses around the first pressure relief mechanism. Part of the exhaust flows to the third through hole through the third cavity and the first opening. Since the blocking portion can cover at least part of the first opening and / or at least part of the second opening, the exhaust flowing to the third through hole is blocked by the blocking portion, thereby reducing the possibility of the exhaust flowing into the fourth cavity, reducing the risk of the first battery cell and the second battery cell being connected by the exhaust, and reducing the possibility of thermal runaway spreading, thereby improving the use reliability of the battery device. Similarly, when the second battery cell is in thermal runaway, the second pressure relief mechanism is actuated, and the released exhaust diffuses around the second pressure relief mechanism. Part of the exhaust flows to the third through hole through the fourth cavity and the second opening. Since the blocking portion can cover at least part of the first opening and / or at least part of the second opening, the exhaust flowing to the third through hole is blocked by the blocking portion, thereby reducing the possibility of the exhaust flowing into the third cavity, reducing the risk of the first battery cell and the second battery cell being connected by the exhaust, and reducing the possibility of thermal runaway spreading, thereby improving the use reliability of the battery device.

[0008] In some embodiments, the blocking part is an annular structure with an avoiding hole formed in the middle part, the avoiding hole is communicated with the third through hole, and the blocking part covers at least part of the first opening and at least part of the second opening.

[0009] By adopting the technical scheme of this embodiment, the particulate matter needs to bypass the blocking part twice to flow between the third cavity and the fourth cavity, the blocking effect of the blocking part is good, and the use reliability of the battery device is improved.

[0010] In some embodiments, the third through hole forms a first sub-hole by penetrating the first plate body, the third through hole forms a second sub-hole by penetrating the second plate body, and the blocking part is arranged in at least one of the first sub-hole and the second sub-hole.

[0011] By adopting the technical scheme of this embodiment, the blocking part can be supported by the hole wall of the first sub-hole and / or the hole wall of the second sub-hole, and the installation of the blocking part is facilitated.

[0012] In some embodiments, the minimum hole diameter of the first sub-hole is smaller than the hole diameter of the second sub-hole, the blocking part is arranged in the second sub-hole, and the blocking part abuts against the first plate body.

[0013] By adopting the technical scheme of this embodiment, the blocking part is arranged in the second sub-hole, the end surface of the blocking part abuts against the first plate body, the inner wall surface of the second sub-hole and the first plate body can be used to position the blocking part, and thus the fixed installation of the blocking part is facilitated.

[0014] In some embodiments, the first sub-hole includes a first hole section and a second hole section communicated with each other, the first hole section is closer to the second cavity than the second hole section, the hole diameter of the first hole section is greater than the hole diameter of the second hole section, the blocking part is inserted into the first hole section, a stepped surface is formed between the first hole section and the second hole section, and the blocking part abuts against the stepped surface.

[0015] By adopting the technical scheme of this embodiment, the blocking part is inserted into the first hole section of the first sub-hole, on the one hand, the first opening and / or the second opening formed between the first plate body and the second plate body can be completely covered in the axial direction of the first sub-hole, which is beneficial to improve the effect of blocking particulate matter, reduce the risk of the first battery monomer and the second battery monomer being connected and conducted, and improve the use reliability of the battery device; on the other hand, the axial positioning of the blocking part is also facilitated, and the fixed installation of the blocking part is facilitated.

[0016] In some embodiments, the blocking part further includes a protruding part connected with the blocking part, the protruding part protrudes from the outer side surface of the blocking part, the protruding part is located on the side of the second plate body away from the first plate body, and the protruding part abuts against the surface of the second plate body.

[0017] By adopting the technical scheme of the embodiment, after the blocking part is inserted into the third through hole from one side of the second plate body, the protruding part abuts against the surface of the second plate body facing away from the first plate body, and the protruding part can limit the movement of the blocking part along the axial direction of the third through hole, thereby facilitating the accurate covering of the first opening and / or the second opening by the blocking part.

[0018] In some embodiments, the blocking piece is welded to the partition plate.

[0019] By adopting the technical scheme of the embodiment, the blocking part is welded to the partition plate, and the welding operation is simple, facilitating the fixed installation of the blocking piece.

[0020] In some embodiments, the welding part of the blocking piece and the partition plate forms a plurality of welding structures, and the plurality of welding structures are distributed along the circumferential direction of the third through hole.

[0021] By adopting the technical scheme of the embodiment, the welding part of the blocking piece and the partition plate forms a plurality of welding structures distributed along the circumferential direction of the third through hole, so that the blocking piece and the partition plate are intermittently welded, which is beneficial to improve the welding efficiency of the blocking piece and the partition plate.

[0022] In some embodiments, the battery monomer assembly includes a plurality of columns of battery monomers arranged along a first direction, each column of battery monomers including a plurality of battery monomers arranged along a second direction and connected in series, and in adjacent and connected columns of battery monomers, one column of battery monomers includes first battery monomers, and the other column of battery monomers includes second battery monomers, the first cavity and the second cavity are arranged along a third direction, and the first rib extends along the second direction; the first direction is perpendicular to the second direction and the third direction, and the second direction is perpendicular to the third direction.

[0023] By adopting the technical scheme of the embodiment, the first rib and the blocking part can separate adjacent third cavities and fourth cavities, can reduce the risk of the adjacent two columns of first battery monomers and second battery monomers being connected and overlapped by the exhaust, and reduce the risk of short circuit, sparking, arc and other problems between battery monomers, which is beneficial to reduce the possibility of thermal runaway spreading.

[0024] In some embodiments, the battery device further includes a connecting component, the first cavity is provided with a beam body, the beam body is provided with a fourth through hole, the fourth through hole is communicated with the third through hole, the connecting component is arranged in the third through hole and the fourth through hole, and the blocking part is arranged away from the connecting component.

[0025] By adopting the technical scheme of the embodiment, the beam body is provided with the fourth through hole, and the connecting component is arranged in the fourth through hole, which is beneficial to improve the connection reliability of the connecting component and the box body; in addition, the connecting component and the blocking part are arranged in cooperation, the blocking part can block the flow of the exhaust while achieving the mounting and fixing by using the third through hole, and the risk of the first battery monomers and the second battery monomers being connected and overlapped is reduced.

[0026] In some embodiments, the housing includes a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to opposite sides of the frame. A partition is connected to the frame and located between the top cover and the bottom plate. A first cavity is formed between the partition and the top cover, and a second cavity is formed between the partition and the bottom plate.

[0027] By adopting the technical solution of this embodiment, the box body achieves effective separation between the first cavity and the second cavity through the design of the top cover, frame, bottom plate and partition, which provides a reliable working space for the battery cells and a reliable channel for venting and depressurization.

[0028] In some embodiments, the material of the barrier includes at least one of stainless steel and mica.

[0029] By adopting the technical solution of this embodiment, both stainless steel and mica have good high temperature resistance. The barrier is made of the above-mentioned materials, which can reduce the possibility of particulate matter melting the barrier, which helps to reduce the risk of the first battery cell and the second battery cell connecting and conducting, and improve the reliability of the battery device.

[0030] Secondly, an electrical device is provided, including the aforementioned battery device.

[0031] By adopting the technical solution of this embodiment, the battery device has good reliability, which is beneficial to improving the reliability of the electrical device.

[0032] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 The diagram shows the structure of a vehicle provided in some embodiments of this application.

[0035] Figure 2 This is an exploded view of a battery device provided in some embodiments of this application.

[0036] Figure 3 This is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application.

[0037] Figure 4 The diagram shows the structure of a single battery cell provided in some embodiments of this application.

[0038] Figure 5 The diagram shows the structure of the battery cell, frame, and separator provided in some embodiments of this application.

[0039] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0040] Figure 7 The diagram shows the structure of the battery cell, frame, separator, and barrier provided in other embodiments of this application.

[0041] Figure 8 for Figure 7 A magnified view of a section at point B.

[0042] Figure 9 for Figure 2 The diagram shows the structural schematic of the frame, beams, partitions, and blocking components.

[0043] Figure 10 For along Figure 9 Sectional view of the CC line.

[0044] Figure 11 for Figure 10 A magnified view of a section at point D.

[0045] Figure 12 for Figure 11 A magnified view of a section at point F.

[0046] Figure 13 The battery cell, frame, separator, and barrier provided in some embodiments of this application are in... Figure 11 A magnified view of a section at point F.

[0047] Figure 14 For along Figure 10 Sectional view of the EE line.

[0048] Figure 15 for Figure 14 A magnified view of a section at point G.

[0049] The following are the labeling elements in the figure: 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 10, Housing; 101, First Chamber; 102, Second Chamber; 11, Top Cover; 12, Frame; 13, Base Plate; 14, Beam; 141, Fourth Through Hole; 20, Battery Cell; 21, Housing; 21a, Large Surface; 22, End Cap; 221, Electrode Terminal; 222, Pressure Relief Mechanism; 23, First Battery Cell; 231, First Pressure Relief Mechanism; 24, Second Battery Cell; 241, Second Pressure Relief Mechanism; 30. Partition; 301, Third cavity; 302, Fourth cavity; 303, Third through hole; 304, First opening; 305, Second opening; 306, First through hole; 307, Second through hole; 31, First plate; 311, First sub-hole; 3111, First hole segment; 3112, Second hole segment; 3113, Step surface; 32, Second plate; 321, Second sub-hole; 33, First rib; 34, Second rib; 40, Blocking member; 401, Clearance hole; 41, Blocking part; 42, Protrusion; 50, Connecting component. Detailed Implementation

[0050] 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 and completely 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.

[0051] In the description of the embodiments of this application, 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, a feature defined with "first" and "second" may explicitly or implicitly include at least one of that feature.

[0052] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0053] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] In the description of this application, it should be understood that the terms "inner", "outer", "side", "upper", "bottom", "front", "rear", etc., indicating the orientation or positional relationship 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.

[0056] In the description of this application, it should be noted that the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0057] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0058] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0059] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0060] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0061] Battery devices are widely used in new energy vehicles, energy storage and other fields. In some battery devices, there is a partition inside the housing. This partition divides the inner cavity of the housing into a first cavity and a second cavity. Groups of battery cells are placed in the first cavity, and the second cavity is used as an exhaust space. This can isolate the emissions from the battery cells from the battery cells themselves and reduce the direct impact of the emissions on the battery cells.

[0062] The assembled battery cells include a first battery cell and a second battery cell. The first battery cell is equipped with a first pressure relief mechanism, and the second battery cell is equipped with a second pressure relief mechanism. Correspondingly, the separator adopts a double-layer plate structure, with a first through hole communicating with the first pressure relief mechanism and a second through hole communicating with the second pressure relief mechanism. The double-layer plate is equipped with a first rib, which divides the internal space of the double-layer plate into a third cavity and a fourth cavity. The third cavity communicates with the first through hole, and the fourth cavity communicates with the second through hole, thereby isolating the emissions from different battery cells and reducing mutual interference.

[0063] In practical applications, some battery devices require a third through-hole in the separator for connecting components to pass through, either for mounting or other reasons. This third through-hole may need to penetrate the double-layer plate and break the first rib, causing the third and fourth cavities to connect. When the first pressure relief mechanism of the first battery cell is activated, the discharged material will flow into the fourth cavity through the third cavity and the third through-hole, causing a conductive connection between the first and second battery cells. This can lead to short circuits, arcing, and other faults between battery cells. Such faults can directly cause thermal runaway to spread rapidly within the battery device, which is detrimental to improving the reliability of the battery device.

[0064] Therefore, reducing the possibility of thermal runaway propagation within battery devices has become an important research topic that urgently needs to be addressed in the battery field.

[0065] Based on this, this application provides a battery device, which includes a housing, a separator, a battery cell assembly, and a blocking member. The separator is disposed within the housing and divides the inner cavity of the housing into a first cavity and a second cavity. The separator includes a first plate and a second plate spaced apart, and a first rib connecting the first plate and the second plate. The first plate is located between the second plate and the first cavity, and a third cavity and a fourth cavity are formed between the first plate and the second plate. The first rib separates the third cavity and the fourth cavity. The battery cell assembly is disposed in the first cavity. The battery cell assembly includes multiple battery cells, among which the multiple battery cells include a first battery cell and a second battery cell. The first battery cell is provided with a first pressure relief mechanism. The separator is provided with a first through hole, which penetrates the first plate and the second plate and communicates with the third cavity. The first pressure relief mechanism is connected to the first cavity. The first pressure relief mechanism is disposed towards the second cavity through the first through hole, allowing the first pressure relief mechanism to relieve pressure to the third cavity and the second cavity; the second battery cell is provided with a second pressure relief mechanism, and the separator is provided with a second through hole, which penetrates the first plate and the second plate and connects to the fourth cavity. The second pressure relief mechanism is disposed towards the second cavity through the second through hole, allowing the second pressure relief mechanism to relieve pressure to the fourth cavity and the second cavity; the first rib is located between the first through hole and the second through hole, and the separator is provided with a third through hole for the connecting component to pass through. The third through hole penetrates the first plate, the second plate and the first rib, so that the separator forms a first opening connecting the third cavity and the third through hole, and a second opening connecting the fourth cavity and the third through hole; a blocking member is connected to the separator, and the blocking member includes a blocking portion that covers at least a portion of the first opening and / or at least a portion of the second opening.

[0066] In the battery device of this application embodiment, after the first pressure relief mechanism of the first battery cell or the first pressure relief mechanism of the second battery cell is actuated, the discharged material can flow between the third and fourth cavities through the first and second openings. The blocking part of the blocking member covers at least a portion of the first opening and / or at least a portion of the second opening, so that the blocking part can block the material. This helps to reduce the movement of the material between the third and fourth cavities through the first and second openings, and reduces the possibility of the first and second battery cells being connected by the material. This reduces the possibility of short circuits, arcing, and other problems between the first and second battery cells, and helps to reduce the possibility of thermal runaway propagation in the battery device after thermal runaway of the first or second battery cell, thereby improving the reliability of the battery device.

[0067] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0068] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0069] 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 bicycles, electric motorcycles, 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.

[0070] Combination Figures 1 to 15 The battery device 100 and the power consumption device according to embodiments of this application will be described. The length direction of the battery device 100 can be referred to as the X direction in the figures, the width direction of the battery device 100 can be referred to as the Y direction in the figures, and the height direction of the battery device 100 can be referred to as the Z direction in the figures. The width direction of the battery cell 20 can be referred to... Figure 4 The thickness direction of the battery cell 20 in the Y1 direction can be found in the reference. Figure 4 The height direction of the battery cell 20 in the X1 direction can be referred to. Figure 4 In the Z1 direction.

[0071] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0072] Please refer to Figure 1 Vehicle 1000 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 unit 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. The battery unit 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation.

[0073] The vehicle 1000 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, for the power needs of the vehicle 1000 during startup, 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 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] See Figure 2 and Figure 3As shown, the battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connections via a busbar.

[0076] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 20.

[0077] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0078] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies housed within the housing 10.

[0079] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 10 by fixing the battery module in the housing 10.

[0080] As an example, the battery cell assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0081] As an example, the housing 10 may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover 11 or a bottom plate 13.

[0082] As an example, the housing 10 may include a top cover 11, a frame 12, and a bottom plate 13. The top cover 11 and the bottom plate 13 are respectively connected to the frame 12, so that the interior of the housing 10 forms a closed space to accommodate the battery cell assembly.

[0083] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0084] See Figure 4As shown in the embodiments of this application, the battery cell 20 can be a secondary battery. A secondary battery refers to a battery cell 20 that can be used again after being discharged by recharging to activate the active materials.

[0085] The battery cell 20 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, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0086] A single battery cell 20 generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the single battery cell 20, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between them while allowing active ions to pass through.

[0087] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0088] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0089] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0091] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0092] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0093] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0094] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0095] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0096] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 20. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cell 20 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0097] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0098] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0099] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0100] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0101] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0102] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0103] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0104] In some embodiments, the battery cell 20 also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0105] Liquid electrolytes include electrolyte salts and solvents.

[0106] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0107] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0108] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell 20, such as additives that improve the overcharge / fast charge performance of the battery cell 20, additives that improve the high-temperature performance of the battery cell 20, additives that improve the low-temperature performance of the battery cell 20, etc.

[0109] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0110] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0111] As an example, the polymers of polymer solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0112] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0113] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0114] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0115] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0116] In some implementations, the electrode assembly is a stacked structure.

[0117] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0118] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0119] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0120] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0121] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0122] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0123] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0124] In some embodiments, the battery cell 20 may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly for encapsulating the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0125] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 20 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0126] In some embodiments, the housing includes an end cap 22 and a housing 21, the housing 21 having an opening, and the end cap 22 covering the opening. The housing 21 may have one or more openings. The end cap 22 may also be provided one or more times.

[0127] In some embodiments, at least one electrode terminal 221 is provided on the housing, and the electrode terminal 221 is electrically connected to the tab. The electrode terminal 221 can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal 221 can be provided on the end cap 22, or it can be provided on the housing 21.

[0128] In some embodiments, a pressure relief mechanism 222 is provided on the housing. The pressure relief mechanism 222 is used to release the internal gas of the battery cell 20.

[0129] As an example, the internal pressure or temperature of the battery cell 20 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 222 is activated or a weak structure provided in the pressure relief mechanism 222 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 20.

[0130] As an example, the pressure relief mechanism 222 can be integrally formed with the housing.

[0131] As an example, the pressure relief mechanism 222 can also be separately configured and connected to the housing.

[0132] The term "actuation" as used in this application refers to the pressure relief mechanism 222 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 222 may include, but are not limited to: movement of components within the pressure relief mechanism 222 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 222, etc. When the pressure relief mechanism 222 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as waste. This method enables pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0133] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism 222 can be configured as a through hole for discharging gas inside the battery cell 20.

[0134] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc. Among these, particulate matter refers to the total amount of solid microparticles, dust, smoke particles, and micro-debris discharged along with the high-temperature and high-pressure jet stream during the high-temperature decomposition, combustion, melting, pulverization, and splashing of internal materials when the battery cell 20 experiences thermal runaway. This belongs to the solid phase component of thermal runaway emissions. Examples include: carbon black and soot produced by the high-temperature cracking or incomplete combustion of the electrolyte organic solvent; graphite micropowder formed by the pulverization and shedding of the negative electrode graphite; metal oxide microparticles formed by the high-temperature structural damage and shedding of the positive electrode active material; polymer solid micro-debris and colloidal particles generated by the high-temperature melting and cracking of the separator; and metal oxide microparticles formed by the high-temperature oxidation and splashing of the current collector, etc.

[0135] In some embodiments, the battery cell 20 has a large surface 21a, which can be the surface with the largest area of ​​the outer shell of the battery cell 20. For example, the battery cell 20 is a prismatic battery cell 20, which is a rectangular surface defined by width × height. That is, both surfaces of the prismatic battery cell 20 that are relatively distributed along its own thickness direction can be called large surfaces 21a.

[0136] Please refer to the following: Figures 5 to 8 As shown, in a first aspect, a battery device 100 is provided. The battery device 100 includes a housing 10, a separator 30, a battery cell 20 assembly, and a blocking member 40. The separator 30 is disposed inside the housing 10 and is used to divide the inner cavity of the housing 10 into a first cavity 101 and a second cavity 102. The separator 30 includes a first plate 31 and a second plate 32 spaced apart, and a first rib 33 connecting the first plate 31 and the second plate 32. The first plate 31 is located between the second plate 32 and the first cavity 101, and the first plate 31 and the second plate 32 are connected by a first rib 33. A third cavity 301 and a fourth cavity 302 are formed, and a first rib 33 separates the third cavity 301 and the fourth cavity 302. A battery cell 20 assembly is disposed in the first cavity 101. The battery cell 20 assembly includes multiple battery cells 20, among which a first battery cell 23 and a second battery cell 24 are included. The first battery cell 23 is provided with a first pressure relief mechanism 231, and the partition 30 is provided with a first through hole 306. The first through hole 306 penetrates the first plate 31 and the second plate 32 and connects to the third cavity 301. The first pressure relief mechanism 231 passes through the first through hole 306. The first pressure relief mechanism 231 is positioned towards the second cavity 102, allowing it to release pressure to the third cavity 301 and the second cavity 102. The second battery cell 24 is equipped with a second pressure relief mechanism 241. The partition 30 has a second through hole 307, which penetrates the first plate 31 and the second plate 32, and connects to the fourth cavity 302. The second pressure relief mechanism 241 is positioned towards the second cavity 102 through the second through hole 307, allowing it to release pressure to the fourth cavity 302 and the second cavity 102. The first rib 33 is located between the first through hole 306 and... Between the second through holes 307, the partition 30 is provided with a third through hole 303 for the connecting component 50 to pass through. The third through hole 303 passes through the first plate 31, the second plate 32 and the first rib 33, so that the partition 30 forms a first opening 304 that connects the third cavity 301 and the third through hole 303, and forms a second opening 305 that connects the fourth cavity 302 and the third through hole 303. The blocking member 40 is connected to the partition 30. The blocking member 40 includes a blocking part 41 that covers at least a portion of the first opening 304 and / or at least a portion of the second opening 305.

[0137] The separator 30 can be a plate-like component that divides the internal cavity of the housing 10 into different cavities, one of which is called the first cavity 101 and the other is called the second cavity 102. The separator 30 separates the first cavity 101 and the second cavity 102. The first cavity 101 is used to accommodate the battery cell assembly. After the battery cell 20 experiences thermal runaway, the pressure relief mechanism 222 of the battery cell 20 is activated. The emissions released by the pressure relief mechanism 222 flow through the separator 30 into the second cavity 102, and then out of the battery assembly 100. This isolates the emissions from the battery cell 20 itself, reducing the direct impact of the emissions on the battery cell 20 and improving the reliability of the battery assembly 100. The separator 30 can be a flat plate, an arc-shaped plate, etc.

[0138] It should be noted that the housing 10 is also equipped with a pressure relief component, which is connected to the second chamber 102. After the pressure relief component is activated, the discharge material in the second chamber 102 is discharged through the pressure relief component. The pressure relief component can be a rupture disc, an explosion-proof membrane, an explosion-proof valve, etc. The partition 30 can be made of materials such as metal or plastic.

[0139] The separator 30 can be a double-layer structure, with one layer near the first cavity 101 being the first plate 31 and the other layer near the second cavity 102 being the second plate 32. The first plate 31 and the second plate 32 are spaced apart, and a first rib 33 is provided between the first plate 31 and the second plate 32. The provision of the first rib 33 helps to improve the structural strength of the separator 30. In particular, when the battery cell 20 is placed on the separator 30 and the separator 30 plays the role of supporting the battery cell 20, the separator 30 has good structural strength and provides good support for the battery cell 20, which helps to improve the reliability of the battery device 100.

[0140] For example, the separator 30 can be a profile plate, which is easy to obtain, facilitates the manufacture of the battery device 100, and has good structural strength, which helps to improve the structural strength of the battery device 100.

[0141] The first rib 33 can refer to the rib structure between the first plate 31 and the second plate 32. The space between the first plate 31 and the second plate 32 can form a third cavity 301 and a fourth cavity 302. The first rib 33 is located between the third cavity 301 and the fourth cavity 302. There can be one or more first ribs 33 between the third cavity 301 and the fourth cavity 302, separating them. The shape of the first rib 33 can be various, such as straight, arc, or bent. The first plate 31, the second plate 32, and the first rib 33 can be an integrated component or connected by welding, snap-fitting, or bonding. An integrated component can refer to a structure manufactured using integrated forming processes such as integrated stretching, integrated cutting, integrated casting, or integrated extrusion.

[0142] In some examples, the two sides of the first rib 33 are connected to the first plate 31 and the second plate 32 respectively, and the space between the first plate 31 and the second plate 32 is divided into a third cavity 301 and a fourth cavity 302 distributed along the length direction perpendicular to the first rib 33.

[0143] The partition 30 is provided with a third through hole 303, which can be a through hole penetrating the first plate 31 and the second plate 32. The third through hole 303 can penetrate the first plate 31 and the second plate 32 along the thickness direction of the partition 30, so that the third through hole 303 can connect the first cavity 101 and the second cavity 102. The third through hole 303 allows the connecting component 50 to pass through. The connecting component 50 can be used to connect with other devices to facilitate the installation and connection of the battery device 100 with other devices. The connecting component 50 can also be used to connect components inside the battery device 100 to improve the structural strength of the battery device 100. The connecting component 50 can be a bolt, a connecting sleeve, a connecting rod, or other components.

[0144] In some examples, the connecting component 50 may be a mounting sleeve, which is used to connect to components such as the frame inside the vehicle 1000 to enable the mounting of the battery device 100 inside the vehicle 1000.

[0145] The third through hole 303 penetrates the first plate 31 and the second plate 32 at the first rib 33 and interrupts the first rib 33. When the first rib 33, located between the third cavity 301 and the fourth cavity 302, is interrupted by the third through hole 303, the third cavity 301 and the fourth cavity 302, which were originally separated by the first rib 33, are connected, and a gap appears on the side of the third through hole 303 facing the third cavity 301, which is the first opening 304. Similarly, a gap also appears on the side of the third through hole 303 facing the fourth cavity 302, which is the second opening 305. The first opening 304 and the second opening 305 extend circumferentially along the third through hole 303 and are distributed circumferentially along the third through hole 303. The first opening 304 and the second opening 305 are separated by the interrupted first rib 33.

[0146] The battery cell 20 opposite to the third cavity 301 is called the first battery cell 23, and the battery cell 20 opposite to the fourth cavity 302 is called the second battery cell 24. The pressure relief mechanism 222 of the first battery cell 23 is called the first pressure relief mechanism 231, and the pressure relief mechanism 222 of the second battery cell 24 is called the second pressure relief mechanism 241. The first pressure relief mechanism 231 is provided on the surface of the first battery cell 23 facing the separator 30, and the second pressure relief mechanism 241 is provided on the surface of the second battery cell 24 facing the separator 30. The first battery cell 23 and the second battery cell 24 may be arranged adjacent to each other or not adjacent to each other.

[0147] A first through hole 306 is provided opposite to the first pressure relief mechanism 231 on the partition plate 30. The first through hole 306 can be a through hole penetrating the first plate 31 and the second plate 32, and this through hole is opposite to the first pressure relief mechanism 231 and communicates with the third cavity 301. In this way, after the first pressure relief mechanism 231 is actuated, the discharged material can flow directly into the second cavity 102 and the third cavity 301 through the first through hole 306, which is beneficial to improving the smoothness of exhaust. The first through hole 306 can penetrate the first plate 31 and the second plate 32 along the thickness direction of the partition plate 30, so that the first through hole 306 can communicate with the second cavity 102 and the third cavity 301, so that the discharged material can flow into the second cavity 102 and the third cavity 301. The first pressure relief mechanism 231 can be inserted into the first through hole 306 or not. The third through hole 303 and the first through hole 306 can partially overlap or be spaced apart.

[0148] A second through hole 307 is provided opposite to the second pressure relief mechanism 241 on the partition plate 30. The second through hole 307 can be a through hole penetrating the first plate 31 and the second plate 32, and this through hole is opposite to the second pressure relief mechanism 241 and communicates with the fourth cavity 302. In this way, after the second pressure relief mechanism 241 is actuated, the discharged material can flow directly into the second cavity 102 and the fourth cavity 302 through the second through hole 307, which helps to improve the smoothness of exhaust. The second through hole 307 penetrates the first plate 31 and the second plate 32, so that the second through hole 307 can communicate with the second cavity 102 and the fourth cavity 302, so that the discharged material can flow into the second cavity 102 and the fourth cavity 302. The second pressure relief mechanism 241 can be inserted into the second through hole 307 or not. The third through hole 303 and the second through hole 307 can partially overlap or be spaced apart.

[0149] The blocking member 40 can block emissions, especially particulate matter in the emissions. Particulate matter in the emissions can easily conduct electricity between battery cells 20; therefore, blocking particulate matter can effectively reduce the possibility of overlap and conduction between battery cells 20. The blocking member 40 can be made of one or more of the following materials: metal, plastic, and composite materials. The blocking member 40 can be connected to the separator 30 by welding, bonding, threading, or other methods. The blocking member 40 can be connected to at least one of the first plate 31, the second plate 32, and the first rib 33.

[0150] The blocking member 40 includes a blocking portion 41, which may refer to the portion of the blocking member 40 used to block the first opening 304 and / or the second opening 305. The blocking portion 41 is also capable of blocking emissions.

[0151] In some examples, the blocking part 41 is located inside the third through hole 303 and extends circumferentially along the third through hole 303, so that the blocking part 41 does not block the third through hole 303, allowing the connecting part 50 to pass through the partition 30 for the installation of the battery device 100.

[0152] In some examples, the blocking part 41 can block at least a portion of the particulate matter. Optionally, the blocking part 41 can block at least a portion of the particulate matter in the emission, but at least a portion of the gas in the emission can pass through the blocking part 41. For example, the blocking part 41 is a filter screen, filter cloth, filter element, or other component. Alternatively, the blocking part 41 can block both at least a portion of the particulate matter and at least a portion of the gas in the emission. For example, the blocking part 41 can be a solid component without a filter hole or other structure, such as a metal ring component, an insulating ring component, etc.

[0153] The discharge flows from the third cavity 301 to the fourth cavity 302, and needs to pass through the first opening 304 and the second opening 305. The blocking part 41 can cover at least a portion of the first opening 304 and / or at least a portion of the second opening 305, so that the blocking part 41 can block at least a portion of the discharge from flowing between the third cavity 301 and the fourth cavity 302 through the first opening 304 and the second opening 305.

[0154] In some examples, the blocking portion 41 may cover at least a portion of the first opening 304; that is, it is not required that the blocking portion 41 completely cover the first opening 304. The blocking portion 41 can cover a portion of the first opening 304, so that the blocking portion 41 can increase the flow resistance of the emission through the first opening 304 between the third cavity 301 and the fourth cavity 302. This can also reduce the risk of the first battery cell 23 and the second battery cell 24 overlapping and conducting. The blocking portion 41 may also cover the entire first opening 304 to better block the emission. In this case, the blocking portion 41 may cover the inner wall surface of the third through hole 303 to cover the first opening 304, and the blocking portion 41 may also extend into the first opening 304 to cover the first opening 304.

[0155] For example, the first opening 304 may be a semi-ring structure extending circumferentially along the third through hole 303, and the blocking part 41 also extends circumferentially along the third through hole 303, thereby forming a semi-ring structure. The blocking part 41 covers the first opening 304 but does not cover the second opening 305. In addition, the space formed between the blocking part 41 and the second opening 305 allows the connecting member 50 to pass through.

[0156] In some examples, the blocking portion 41 may cover at least a portion of the second opening 305, meaning it is not required that the blocking portion 41 completely covers the second opening 305. The blocking portion 41 can cover a portion of the second opening 305, thereby increasing the flow resistance of the emissions through the second opening 305 between the third cavity 301 and the fourth cavity 302. This also reduces the risk of the first battery cell 23 and the second battery cell 24 overlapping and conducting. Alternatively, the blocking portion 41 may cover the entire second opening 305 to better block emissions. The blocking portion 41 may cover the inner wall of the third through hole 303 to cover the second opening 305, and a portion of the blocking portion 41 may extend into the second opening 305 to cover the first opening 304.

[0157] For example, the second opening 305 may be a semi-ring structure extending circumferentially along the third through hole 303, and the blocking part 41 also extends circumferentially along the third through hole 303, thereby forming a semi-ring structure. The blocking part 41 covers the second opening 305 but does not cover the first opening 304. In addition, the space formed between the blocking part 41 and the first opening 304 allows the connecting member 50 to pass through.

[0158] In some examples, the blocking part 41 can block at least a portion of the first opening 304 and at least a portion of the second opening 305, so that at least a portion of the discharge needs to bypass the blocking part 41 twice before it can flow between the third cavity 301 and the fourth cavity 302 through the first opening 304 and the second opening 305. The blocking part 41 has a good blocking effect, which helps to improve the reliability of the battery device 100.

[0159] By adopting the technical solution of this embodiment, when the first battery cell 23 experiences thermal runaway, the first pressure relief mechanism 231 is activated, and the released emissions diffuse around the first pressure relief mechanism 231. Some of the emissions will flow through the third cavity 301 and the first opening 304 to the third through hole 303. Since the blocking part 41 can cover at least a portion of the first opening 304 and / or at least a portion of the second opening 305, the emissions flowing to the third through hole 303 will be blocked by the blocking part 41, thereby reducing the possibility of emissions flowing into the fourth cavity 302, reducing the risk of the first battery cell 23 and the second battery cell 24 being connected by emissions, reducing the possibility of thermal runaway propagation, and thus improving the reliability of the battery device 100.

[0160] Similarly, when the second battery cell 24 experiences thermal runaway, the second pressure relief mechanism 241 is activated, and the released emissions diffuse around the second pressure relief mechanism 241. Some of the emissions will flow into the third through hole 303 through the fourth cavity 302 and the second opening 305. Since the blocking part 41 can cover at least a portion of the first opening 304 and / or at least a portion of the second opening 305, the emissions flowing to the third through hole 303 will be blocked by the blocking part 41, thereby reducing the possibility of emissions flowing into the third cavity 301, reducing the risk of the first battery cell 23 and the second battery cell 24 being connected by emissions, reducing the possibility of thermal runaway propagation, and thus improving the reliability of the battery device 100.

[0161] In some embodiments, when the battery device 100 is installed in the vehicle 1000, the separator 30 is arranged generally horizontally, the first cavity 101 and the second cavity 102 are arranged vertically, and the third cavity 301 and the fourth cavity 302 can be arranged front-to-back or side-to-side; after the first pressure relief mechanism 231 is actuated, the released pressure can push a portion of the discharge into the third cavity 301, and sequentially through the third cavity 301, the first opening 304, the third through hole 303, and the second opening 305 into the fourth cavity 302; or, after the second pressure relief mechanism 241 is actuated, the released pressure can push a portion of the discharge into the fourth cavity 302. The battery has four cavities 302, and enters the third cavity 301 sequentially through the fourth cavity 302, the second opening 305, the third through hole 303, and the first opening 304. The blocking part 41 covers at least a portion of the first opening 304 and / or at least a portion of the second opening 305. The blocking part 41 can block the emission, reduce the movement of the emission between the third cavity 301 and the fourth cavity 302 through the first opening 304 and the second opening 305, reduce the risk of the first battery cell 23 and the second battery cell 24 being connected by the emission, reduce the possibility of thermal runaway propagation, and thus improve the reliability of the battery device 100.

[0162] In some embodiments, when the battery device 100 is installed in the vehicle 1000, the partition 30 can be arranged generally vertically, the first cavity 101 and the second cavity 102 can be arranged front-to-back or side-to-side, and the third cavity 301 and the fourth cavity 302 can be arranged vertically. After the first pressure relief mechanism 231 is actuated, the released pressure can push a portion of the discharge into the third cavity 301, and then sequentially through the third cavity 301, the first opening 304, the third through hole 303, and the second opening 305 into the fourth cavity 302. Alternatively, after the second pressure relief mechanism 241 is actuated, the released pressure can push a portion of the discharge into the fourth cavity 302. The fourth cavity 302, and the material enters the third cavity 301 sequentially through the fourth cavity 302, the second opening 305, the third through hole 303, and the first opening 304. The blocking part 41 covers at least a portion of the first opening 304 and / or at least a portion of the second opening 305. The blocking part 41 can block the emission, reduce the movement of the emission between the third cavity 301 and the fourth cavity 302 through the first opening 304 and the second opening 305, reduce the risk of the first battery cell 23 and the second battery cell 24 being connected by the emission, reduce the possibility of thermal runaway propagation, and thus improve the reliability of the battery device 100.

[0163] In some embodiments, the blocking portion 41 may seal at least one of the first opening 304 and the second opening 305.

[0164] In some examples, the barrier 41 seals the first opening 304, making it difficult for gas and particulate matter in the emission to pass through the barrier 41, and making it difficult for gas and particulate matter in the emission to flow between the third cavity 301 and the fourth cavity 302 through the first opening 304.

[0165] For example, the blocking part 41 can be attached to the first opening 304 to seal the first opening 304; the blocking part 41 can also be inserted into the first opening 304 to seal the first opening 304.

[0166] In some examples, the barrier 41 seals the second opening 305, making it difficult for gas and particulate matter in the emission to pass through the barrier 41, and making it difficult for gas and particulate matter in the emission to flow between the third cavity 301 and the fourth cavity 302 through the second opening 305.

[0167] For example, the blocking part 41 can be attached to the second opening 305 to seal the second opening 305; the blocking part 41 can also be inserted into the second opening 305 to seal the second opening 305.

[0168] In some examples, the blocking part 41 blocks the first opening 304 and the second opening 305, so that the gas and particulate matter in the emission need to pass through the first opening 304 and the second opening 305 to flow between the third cavity 301 and the fourth cavity 302. The blocking part 41 sealing the first opening 304 and the second opening 305 can more effectively block the particulate matter and gas in the emission, which is beneficial to improving the reliability of the battery device 100.

[0169] By adopting the technical solution of this embodiment, the blocking part 41 can seal at least one of the first opening 304 and the second opening 305. The blocking part 41 can effectively block particulate matter and also block gas in the emission, reducing the flow of particulate matter and gas between the third cavity 301 and the fourth cavity 302 through the first opening 304 and the second opening 305. This reduces the impact of gas and particulate matter released after the thermal runaway of the first battery cell 23 on the second battery cell 24, or reduces the impact of gas and particulate matter released after the thermal runaway of the second battery cell 24 on the first battery cell 23, which helps to reduce the possibility of thermal runaway propagation.

[0170] In some embodiments, the blocking part 41 itself can block particulate matter and gas, but when the blocking part 41 is connected to the first plate 31 or the second plate 32, the blocking part 41 and the first plate 31 or the second plate 32 are not sealed together, so that there is a gap between the blocking part 41 and the first plate 31 or the second plate 32, allowing some gas or particulate matter to flow out through the gap.

[0171] See Figure 8As shown, in some embodiments, the blocking portion 41 is an annular structure with a clearance hole 401 formed in the middle, the clearance hole 401 is connected to the third through hole 303, and the blocking portion 41 covers at least a portion of the first opening 304 and at least a portion of the second opening 305.

[0172] The blocking part 41 has a ring-shaped structure. It is inserted into the third through hole 303 and fits against the inner wall of the third through hole 303, thereby covering the first opening 304 and the second opening 305 located around the third through hole 303. The inner hole formed in the middle of the blocking part 41 is the clearance hole 401, through which the connecting component 50 can pass. The blocking part 41 may cover part or all of the first opening 304, and it may also cover part or all of the second opening 305.

[0173] The shape of the blocking part 41 is adapted to the shape of the third through hole 303. For example, the shape of the connecting part 50 is circular, square or elliptical, and the corresponding shapes of the third through hole 303 and the blocking part 41 are circular, square or elliptical, respectively.

[0174] By adopting the technical solution of this embodiment, particulate matter needs to bypass the blocking part 41 twice before it can flow between the third cavity 301 and the fourth cavity 302. The blocking part 41 has a good blocking effect, which is beneficial to improving the reliability of the battery device 100.

[0175] See Figures 9 to 12 As shown, in some embodiments, the third through hole 303 penetrates the first plate 31 to form a first sub-hole 311, the third through hole 303 penetrates the second plate 32 to form a second sub-hole 321, and the blocking part 41 is provided in at least one of the first sub-hole 311 and the second sub-hole 321.

[0176] In some examples, the blocking part 41 passes through the first sub-hole 311, and the hole wall of the first sub-hole 311 can support the blocking part 41, which facilitates the installation of the blocking part 41.

[0177] For example, one end of the blocking part 41 along the axial direction of the third through hole 303 passes through the first sub-hole 311, and the end face of the other end of the blocking part 41 along the axial direction of the third through hole 303 can abut against the second plate 32, or form a small gap with the second plate 32.

[0178] In some examples, the blocking part 41 passes through the second sub-hole 321, and the hole wall of the second sub-hole 321 can support the blocking part 41, making it easier to install the blocking part 41.

[0179] For example, one end of the blocking part 41 along the axial direction of the third through hole 303 passes through the second sub-hole 321, and the end face of the other end of the blocking part 41 along the axial direction of the third through hole 303 can abut against the first plate 31, or form a small gap with the first plate 31.

[0180] In some examples, the blocking part 41 is respectively inserted into the first sub-hole 311 and the second sub-hole 321 at both ends along the axial direction of the third through hole 303. In this way, the first opening 304 and / or the second opening 305 can be completely covered along the axial direction of the third through hole 303, which is beneficial to improving the blocking effect of the blocking part 41 in blocking particles. In addition, both ends of the blocking part 41 along the axial direction of the third through hole 303 are supported, which also facilitates the installation of the blocking part 41.

[0181] By adopting the technical solution of this embodiment, the blocking part 41 can be supported by the hole wall of the first sub-hole 311 and / or the hole wall of the second sub-hole 321, which facilitates the installation of the blocking part 41.

[0182] In some embodiments, the minimum aperture of the first sub-hole 311 is smaller than the aperture of the second sub-hole 321, and the blocking part 41 passes through the second sub-hole 321 and abuts against the first plate 31.

[0183] The minimum diameter of the first sub-hole 311 can refer to the size of the first sub-hole 311 at the position with the smallest diameter value among all cross sections perpendicular to its own axis.

[0184] In some examples, the first sub-hole 311 is a regular cylindrical hole, and the minimum diameter of the first sub-hole 311 is equal to the diameter of the cylindrical hole.

[0185] In some examples, the first sub-hole 311 is a tapered hole or a stepped hole, and the minimum diameter of the first sub-hole 311 is the dimension at the minimum radial dimension.

[0186] The diameter of the second sub-hole 321 can refer to the diameter of the cross section of the second sub-hole 321 perpendicular to its own axis.

[0187] In some examples, if the second sub-hole 321 is a regular cylindrical hole, the diameter of the second sub-hole 321 is equal to the diameter of the cylindrical hole.

[0188] The blocking part 41 passes through the second sub-hole 321. The blocking part 41 may not pass through the first sub-hole 311. The end face of the blocking part 41 facing away from the second sub-hole 321 abuts against the surface of the first plate 31 facing the second plate 32.

[0189] The blocking part 41 is inserted into the second sub-hole 321. The end face of the blocking part 41 facing away from the second sub-hole 321 abuts against the inner wall surface of the second sub-hole 321.

[0190] The minimum diameter of the first sub-hole 311 is D1, and the diameter of the second sub-hole 321 is D2, where D1 < D2.

[0191] By adopting the technical solution of this embodiment, the blocking part 41 is inserted through the second sub-hole 321, and the end face of the blocking part 41 abuts against the first plate 31. The blocking part 41 can be positioned by the inner wall surface of the second sub-hole 321 and the first plate 31, thereby facilitating the fixed installation of the blocking part 41.

[0192] See Figure 11 and Figure 12 As shown, in some embodiments, the first sub-hole 311 includes a first hole segment 3111 and a second hole segment 3112 that are connected. The first hole segment 3111 is closer to the second cavity 102 than the second hole segment 3112. The diameter of the first hole segment 3111 is larger than the diameter of the second hole segment 3112. The blocking part 41 is inserted into the first hole segment 3111. A stepped surface 3113 is formed between the first hole segment 3111 and the second hole segment 3112. The blocking part 41 abuts against the stepped surface 3113.

[0193] The first sub-hole 311 can be a stepped hole, which includes two hole segments. The hole segment closer to the second cavity 102 is the first hole segment 3111, and the hole segment farther away from the second cavity 102 is the second hole segment 3112. The diameter of the first hole segment 3111 is larger than the diameter of the second hole segment 3112.

[0194] The diameter of the first hole segment 3111 is d2, and the diameter of the second hole segment 3112 is d1, where d1 < d2. The minimum diameter of the first sub-hole can be taken as the diameter of the first hole segment 3111.

[0195] The stepped surface 3113 can refer to the annular end face directly formed by the difference in diameter between the first hole segment 3111 and the second hole segment 3112.

[0196] By adopting the technical solution of this embodiment, the blocking part 41 is inserted into the first hole segment 3111 of the first sub-hole 311. On the one hand, the first opening 304 and / or the second opening 305 formed between the first plate 31 and the second plate 32 can be completely covered in the axial direction of the first sub-hole 311, which is beneficial to improve the effect of blocking particulate matter, reduce the risk of the first battery cell 23 and the second battery cell 24 overlapping and conducting, and improve the reliability of the battery device 100. On the other hand, it is also convenient for the axial positioning of the blocking part 41 and for the fixed installation of the blocking part 41.

[0197] See Figure 8 and Figure 13As shown, in some embodiments, the blocking member 40 further includes a protrusion 42 connected to the blocking part 41. The protrusion 42 protrudes from the outer side of the blocking part 41 and is located on the side of the second plate 32 facing away from the first plate 31. The protrusion 42 abuts against the surface of the second plate 32.

[0198] The protrusion 42 can refer to the flange structure at the end of the blocking portion 41 near the second plate 32. The protrusion 42 extends circumferentially along the blocking portion 41 and is used to abut against the surface of the second plate 32 facing away from the first plate 31 to restrict the axial movement of the blocking portion 41. The blocking portion 41 and the protrusion 42 are integral components, or they can be fixedly connected by snap-fit, adhesive or other methods.

[0199] In some examples, the blocking part 41 is an annular structure, and the protrusion 42 is an annular flange on the outer side of the blocking part 41, protruding from the outer peripheral surface of the blocking part 41.

[0200] By adopting the technical solution of this embodiment, after the blocking part 41 is inserted into the third through hole 303 from one side of the second plate 32, the protrusion 42 abuts against the surface of the second plate 32 facing away from the first plate 31. The protrusion 42 can restrict the movement of the blocking part 41 along the axial direction of the third through hole 303, thereby facilitating the blocking part 41 to accurately cover the first opening 304 and / or the second opening 305.

[0201] In some embodiments, the material of the blocking member 40 includes at least one of stainless steel and mica.

[0202] In some examples, the material of the stop 40 includes stainless steel.

[0203] For example, the material of the blocking member 40 is stainless steel. Stainless steel has good high-temperature resistance, making it less likely for particles to melt, thus improving its particle-blocking effect. Furthermore, stainless steel is easy to weld to the partition 30, facilitating the connection between the partition 30 and the blocking member 40. Of course, in other examples, the material of the blocking member 40 may include materials other than stainless steel.

[0204] In some examples, the material of the barrier 40 includes mica.

[0205] For example, the material of the blocking member 40 is mica. Mica has good high-temperature resistance, making it less likely for particles to melt the blocking member 40, thus improving its particle-blocking effect. The mica-made blocking member 40 can be fixed to the partition 30 by adhesive bonding, snap-fitting, fasteners, or other connection methods to connect the partition 30 and the blocking member 40. Of course, in other examples, the material of the blocking member 40 can also include materials other than mica.

[0206] In some examples, the material of the barrier 40 includes mica and stainless steel, and the material of the barrier 40 may also include other materials besides mica and stainless steel.

[0207] By adopting the technical solution of this embodiment, stainless steel and mica both have good high temperature resistance. The blocking component 40 is made of the above-mentioned materials, which can reduce the possibility of particulate matter melting the blocking component 40, which is conducive to reducing the risk of the first battery cell 23 and the second battery cell 24 overlapping and conducting, and improving the reliability of the battery device 100.

[0208] In some embodiments, the blocking member 40 is welded to the partition 30.

[0209] In some examples, the blocking element 40 is welded to the first plate 31.

[0210] For example, the end of the blocking part 41 inserted into the first hole segment 3111 is welded to the first plate 31.

[0211] In some examples, the blocking element 40 is welded to the second plate 32.

[0212] For example, the end of the blocking part 41 that is inserted into the second sub-hole 321 is welded to the second plate 32; or, the protrusion 42 is welded to the second plate 32.

[0213] In some examples, the blocking element 40 is welded to both the first plate 31 and the second plate 32.

[0214] By adopting the technical solution of this embodiment, the blocking part 41 is welded to the partition plate 30. The welding operation is simple and facilitates the fixed installation of the blocking part 40.

[0215] In some embodiments, multiple welded structures are formed at the weld joint of the blocking member 40 and the partition 30, and the multiple welded structures are distributed circumferentially along the third through hole 303.

[0216] After the blocking component and the partition are intermittently welded around the third through hole at the connection point, multiple welded structures are formed. The welded structures can be welds, weld points, etc.

[0217] There are multiple welded structures, which are distributed at intervals along the circumference of the third through hole.

[0218] In some examples, the connection between the end of the blocking part 41 inserted into the first hole segment 3111 and the first plate 31 is provided with multiple welded structures distributed circumferentially along the third through hole 303.

[0219] In some examples, the end of the blocking part 41 that is inserted into the second sub-hole 321 and the connection between the second plate body 32 are provided with a plurality of welded structures distributed circumferentially along the third through hole 303.

[0220] In some examples, the connection between the protrusion 42 and the second plate 32 is provided with multiple welded structures distributed circumferentially along the third through hole 303.

[0221] By adopting the technical solution of this embodiment, the welding joint of the blocking member 40 and the partition plate 30 forms multiple welding structures that are circumferentially spaced along the third through hole 303, so that the blocking member 40 and the partition plate 30 are welded intermittently, which is beneficial to improving the welding efficiency of the blocking member 40 and the partition plate 30.

[0222] See Figure 2 , Figure 3 , Figure 14 and Figure 15 As shown, in some embodiments, the battery cell assembly includes multiple rows of battery cells 20 arranged along a first direction. Each row of battery cells 20 includes multiple battery cells 20 arranged in series along a second direction. In two adjacent and series-connected rows of battery cells 20, one row of battery cells 20 includes a first battery cell 23, and the other row of battery cells 20 includes a second battery cell 24. The first cavity 101 and the second cavity 102 are arranged at intervals along a third direction. The first rib 33 extends along the second direction. The first direction is perpendicular to the second direction and the third direction, and the second direction is perpendicular to the third direction.

[0223] The first direction, the second direction, and the third direction are perpendicular to each other. The first direction can be referred to as the width direction of the battery device 100, the second direction can be referred to as the length direction of the battery device 100, and the third direction can be referred to as the height direction of the battery device 100; or, the first direction can be referred to as the length direction of the battery device 100, the second direction can be referred to as the width direction of the battery device 100, and the third direction can be referred to as the height direction of the battery device 100.

[0224] The battery cells 20 in the battery cell assembly are arranged in a matrix along the first direction and the second direction. Multiple battery cells 20 arranged along the second direction are called a column of battery cells 20, and battery cells 20 arranged along the first direction are called a row of battery cells 20. The regular arrangement of the battery cells 20 is beneficial to improving the volumetric energy density of the battery device 100.

[0225] The first cavity 101 and the second cavity 102 are arranged along a third direction. The second cavity 102 is located on the side of the array of battery cells 20. Emissions can flow to the second cavity 102 along the third direction, reducing the impact on the battery cells 20 arranged along the first and second directions. This achieves physical isolation between the working area and the exhaust area of ​​the battery cells 20, reduces the impact of emissions generated by thermal runaway of the battery cells 20 on adjacent battery cells 20, and improves the reliability and structural compactness of the battery device 100.

[0226] The first rib 33 extends along the second direction. Optionally, the first rib 33 extends from one end face of the first plate 31 along the second direction to the other end face. This allows the first rib 33 to separate the third cavity 301 and the fourth cavity 302 corresponding to the two adjacent rows of battery cells 20 in the second direction. The first rib 33 can also reduce the possibility of emissions flowing between the third cavity 301 and the fourth cavity 302, which helps to reduce the possibility of thermal runaway spreading between the two adjacent rows of battery cells 20, thereby effectively improving the reliability of the battery device 100.

[0227] Two adjacent rows of battery cells 20 are connected in series. Multiple cells 20 in one row are arranged along the second direction and connected in series internally; at least one cell 20 in this row can be called a first battery cell 23. Multiple cells 20 in the other row are also arranged along the second direction and connected in series internally; at least one cell 20 in this row is called a second battery cell 24. These two rows of cells 20 are then connected in series, creating a voltage difference between the first battery cell 23 and the second battery cell 24. The greater the voltage difference between the first battery cell 23 and the second battery cell 24, the more likely it is to cause short circuits, arcing, or other problems when the first battery cell 23 and the second battery cell 24 are connected by emitted materials.

[0228] In particular, when the first battery cell 23 and the second battery cell 24 are separated by multiple battery cells 20 in the series path of the battery cells 20, the voltage difference between the first battery cell 23 and the second battery cell 24 is equal to the sum of the voltages of the multiple battery cells 20. Compared with the voltage difference between two adjacent battery cells 20 arranged along the second direction, which is equal to the voltage of one battery cell 20, the voltage difference between the first battery cell 23 and the second battery cell 24 is larger. After the first battery cell 23 and the second battery cell 24 are connected by the emission material, it is easier for short circuits, sparking, arcing and other problems to occur between the first battery cell 23 and the second battery cell 24, causing rapid spread of thermal runaway. The setting of the first rib 33 and the blocking part 41 can effectively reduce the risk of the first battery cell 23 and the second battery cell 24 being connected by the particulate matter, reduce the risk of short circuits, sparking and arcing and other problems between the first battery cell 23 and the second battery cell 24, and effectively reduce the possibility of thermal runaway spread.

[0229] In some examples, in two adjacent columns of battery cells 20 connected in series, multiple battery cells 20 in one column are referred to as first battery cells 23, and multiple battery cells 20 in the other column are referred to as second battery cells 24. Multiple first through holes 306 corresponding to a column of first battery cells 23 are arranged along a second direction to form a column of first through holes 306, and multiple second through holes 307 corresponding to a column of second battery cells 24 are arranged along a second direction to form a column of second through holes 307.

[0230] By adopting the technical solution of this embodiment, the first rib 33 and the blocking part 41 can separate the adjacent third cavity 301 and fourth cavity 302, which can reduce the risk of the adjacent two rows of first battery cells 23 and second battery cells 24 being connected by emissions, reduce the risk of short circuits, sparking, arcing and other problems between battery cells 20, and help reduce the possibility of thermal runaway propagation.

[0231] In some embodiments, a second rib 34 is further connected between the first plate 31 and the second plate 32. The provision of the second rib 34 helps to increase the structural strength of the partition 30. The second rib 34 can extend along a second direction and be spaced apart from the first rib 33. The second rib 34 is penetrated by a corresponding first through hole 306 or second through hole 307 to facilitate the connection of the cavities on both sides of the second rib 34 and to facilitate exhaust. The second rib 34 can also extend along a first direction or other directions.

[0232] In some embodiments, the first rib 33 may also extend along a first direction, and two adjacent battery cells 20 distributed along a second direction may be referred to as the first battery cell 23 and the second battery cell 24, respectively.

[0233] In some embodiments, among four adjacent battery cells 20, two diagonally adjacent battery cells 20 may be referred to as the first battery cell 23 and the second battery cell 24, respectively.

[0234] See Figure 2 , Figures 9 to 11 As shown, in some embodiments, the battery device 100 further includes a connecting member 50. A beam 14 is provided in the first cavity 101. The beam 14 is provided with a fourth through hole 141, which communicates with the third through hole 303. The connecting member 50 passes through the third through hole 303 and the fourth through hole 141, and the blocking part 41 avoids the connecting member 50.

[0235] The beam 14 can refer to a structural reinforcement within the battery device 100, such as a long strip-shaped support beam, reinforcing beam, isolation beam, expansion beam, etc. The beam 14 can be a profile beam, or it can be a component formed by bending a plate. The beam 14 can also be other structures.

[0236] In some examples, the beam 14 may extend along a first direction to separate two adjacent rows of battery cells 20. The beam 14 may be positioned opposite to the large surface 21a of the battery cell 20. The large surface 21a may refer to the surface with the largest area of ​​the battery cell 20, where the expansion is greatest. Since the beam 14 is opposite to the large surface 21a, the beam 14 can restrict the expansion of the large surface 21a. In this case, the beam 14 may be called an expansion beam.

[0237] The fourth through hole 141 can refer to a through hole in the beam 14. The fourth through hole 141 and the third through hole 303 on the partition 30 are arranged opposite to each other. The third through hole 303 and the fourth through hole 141 are approximately coaxial and interconnected. This makes it easy for the connecting component 50 to pass directly through the third through hole 303 and the fourth through hole 141. The connecting component 50 can pass through the beam 14. When the connecting component 50 is connected to other devices, it helps to improve the reliability of the connection between the battery device 100 and other devices. When the connecting component 50 is used to connect the internal components of the battery device 100, it helps to improve the structural reliability of the battery device 100 itself.

[0238] The structural dimensions of the connecting component 50 are adapted to the dimensions of the third through hole 303 and the fourth through hole 141 to improve the stability of the connecting component 50 during installation.

[0239] The blocking part 41 can be sleeved on the outside of the connecting member 50. The blocking part 41 is located between the outer peripheral surface of the connecting member 50 and the inner wall of the third through hole 303 to cover at least a portion of the first opening 304 and / or at least a portion of the second opening 305. The structural shape of the blocking part 41 matches the contour of the outer peripheral surface of the connecting member 50 and the inner wall of the third through hole 303.

[0240] In some examples, the blocking part 41 is a ring structure, and the connecting part 50 can be sequentially inserted into the fourth through hole 141 of the beam 14 and the clearance hole 401 of the blocking part 41 along a third direction. Since the fourth through hole 141 is arranged opposite to and communicates with the third through hole 303, the inner hole of the blocking part 41 can also be arranged opposite to and communicate with the fourth through hole 141, so that the connecting part 50 can smoothly pass through the beam 14 and the partition 30. Among them, the connecting part 50 and the fourth through hole 141 and the clearance hole 401 of the blocking part 41 can adopt a clearance fit or a transition fit.

[0241] By adopting the technical solution of this embodiment, the beam 14 is provided with a fourth through hole 141, and the connecting component 50 passes through the fourth through hole 141, which is beneficial to improve the connection reliability between the connecting component 50 and the box 10; in addition, the cooperative arrangement of the connecting component 50 and the blocking part 41 can not only achieve the mounting and fixing by using the third through hole 303, but also block the flow of the discharge, reducing the risk of the first battery cell 23 and the second battery cell 24 overlapping and conducting.

[0242] In some embodiments, the housing 10 includes a top cover 11, a frame 12, and a bottom plate 13. The top cover 11 and the bottom plate 13 are respectively connected to opposite sides of the frame 12. A partition 30 is connected to the frame 12 and located between the top cover 11 and the bottom plate 13. A first cavity 101 is formed between the partition 30 and the top cover 11, and a second cavity 102 is formed between the partition 30 and the bottom plate 13.

[0243] The housing 10 can refer to the main body of the battery device 100 that supports and protects it. It is used to encapsulate components such as battery cells, beams 14, and separators 30. At the same time, it forms a first cavity 101 and a second cavity 102 through reasonable partitioning, thereby improving the structural stability and reliability of the battery device 100.

[0244] The housing 10 includes a top cover 11, a frame 12, and a bottom plate 13. The top cover 11 and the bottom plate 13 are respectively connected to the opposite sides of the frame 12 to form a closed or semi-closed overall structure.

[0245] The frame 12 can be a ring or square frame structure, serving as the supporting skeleton of the housing 10. The top cover 11 and the bottom plate 13 are arranged parallel to each other, and both are fixed to the upper and lower opposite sides of the frame 12 by bolts, welding, snap-fit ​​connections, or integral molding, etc. The connection is firm and the seal is reliable, which can reduce the risk of external impurities and moisture entering the housing 10 and damaging the battery cells 20. The frame 12, top cover 11 and bottom plate 13 can be made of metal (such as stainless steel, aluminum alloy) or high-strength insulating material (such as engineering plastics, fiberglass) according to actual needs. If the battery device 100 has electrical insulation requirements, insulating materials can be given priority, or the surface of the metal material can be insulated.

[0246] The partition 30 is connected to the side of the frame 12 facing the bottom plate 13 and is located between the top cover 11 and the bottom plate 13. That is, the partition 30 forms a transverse partition structure inside the housing 10, dividing the internal space of the housing 10 into two independent and non-interfering cavities along a third direction (the relative arrangement direction of the top cover 11 and the bottom plate 13), namely the first cavity 101 and the second cavity 102. The enclosed space formed between the partition 30 and the top cover 11 is the first cavity 101, which is used to accommodate components such as the battery cell assembly and the beam 14, providing protection and installation space for the normal operation of the battery cell 20. The enclosed space formed between the partition 30 and the bottom plate 13 is the second cavity 102, which serves as an exhaust and pressure relief channel in case of thermal runaway of the battery cell 20. It is used to collect and guide the emissions generated by the battery cell 20, reducing the risk of cascading thermal runaway caused by the accumulation of emissions in the first cavity 101.

[0247] When the first opening 304 is covered by the blocking part 41 and the second opening 305 is not covered by the blocking part 41, in the event of thermal runaway of the first battery cell 23, particles in the second cavity 102 can rebound through the bottom plate 13 into the third through hole 303, and then flow through the second opening 305 to the second battery cell 24, posing a risk of contact and connection between the first battery cell 23 and the second battery cell 24. Alternatively, when the second opening 305 is covered by the blocking part 41 and the first opening 304 is not covered by the blocking part 41, the second battery cell 24 may experience thermal runaway. During control, particles in the second cavity 102 can bounce off the bottom plate 13 and enter the third through hole 303, and then flow through the first opening 304 to the first battery cell 23. This may cause the first battery cell 23 and the second battery cell 24 to overlap and conduct. However, the first opening 304 and the second opening 305 are both covered by the blocking part 41. In this way, the blocking part 41 can block the particles bounced off the bottom plate 13, thereby effectively reducing the risk of overlap and conduction between the first battery cell 23 and the second battery cell 24, which is beneficial to improving the reliability of the battery device 100.

[0248] By adopting the technical solution of this embodiment, the housing 10, through the design of the top cover 11, frame 12, bottom plate 13 and partition 30, effectively separates the first cavity 101 and the second cavity 102, providing a reliable working space for the battery cell 20 and a reliable channel for venting and depressurization.

[0249] In some embodiments, both the base plate 13 and the top cover 11 are provided with through holes for the connecting member 50 to pass through, so that the connecting member 50 can be fixed to other components after passing through the entire battery device 100.

[0250] Secondly, an electrical device is provided, including the battery device 100 described above.

[0251] By adopting the technical solution of this embodiment, the battery device 100 has good reliability, which is conducive to improving the reliability of the power device.

[0252] See Figures 2 to 15 As shown, in some embodiments, the battery device 100 includes a housing 10, a battery cell assembly, a blocking member 40, and a connecting member 50. The housing 10 includes a top cover 11, a frame 12, and a bottom plate 13. The top cover 11 and the bottom plate 13 are respectively connected to opposite sides of the frame 12. A partition 30 is connected to the side of the frame 12 facing the bottom plate 13 and is located between the top cover 11 and the bottom plate 13. A first cavity 101 is formed between the partition 30 and the top cover 11, and a second cavity 102 is formed between the partition 30 and the bottom plate 13.

[0253] The battery cell assembly includes multiple rows of battery cells 20 arranged along a first direction. In two adjacent and connected rows of battery cells 20, one row of battery cells 20 includes multiple first battery cells 23 arranged and connected along a second direction, and the other row of battery cells 20 includes multiple second battery cells 24 arranged and connected along the second direction. The first cavity 101 and the second cavity 102 are arranged at intervals along a third direction. The first direction is perpendicular to the second direction and the third direction, and the second direction is perpendicular to the third direction.

[0254] The partition 30 includes a first plate 31 and a second plate 32 spaced apart, and a first rib 33 connecting the first plate 31 and the second plate 32. The first plate 31 is located between the second plate 32 and the first cavity 101. A third cavity 301 and a fourth cavity 302 are formed between the first plate 31 and the second plate 32. The first rib 33 separates the third cavity 301 and the fourth cavity 302. A battery cell 20 assembly is disposed in the first cavity 101. The battery cell 20 assembly includes multiple battery cells 20, among which there are first battery cells 23 and second battery cells 24. The first battery cell 23 is provided with a first pressure relief mechanism 231. The partition 30 is provided with a first through hole 306, which penetrates the first plate 31 and the second plate 32 and connects to the third cavity 301. The first pressure relief mechanism 231 is disposed towards the second cavity 102 through the first through hole 306. This allows the first pressure relief mechanism 231 to relieve pressure to the third cavity 301 and the second cavity 102; the second battery cell 24 is provided with a second pressure relief mechanism 241, and the partition 30 is provided with a second through hole 307, which penetrates the first plate 31 and the second plate 32 and connects to the fourth cavity 302. The second pressure relief mechanism 241 is positioned towards the second cavity 102 through the second through hole 307, so that the second pressure relief mechanism 241 can relieve pressure to the fourth cavity 302 and the second cavity 102; the first rib 33 is located between the first through hole 306 and the second through hole 307, and the partition 30 is provided with a third through hole 303, which penetrates the first plate 31, the second plate 32 and the first rib 33, so that the partition 30 forms a first opening 304 connecting the third cavity 301 and the third through hole 303, and a second opening 305 connecting the fourth cavity 302 and the third through hole 303.

[0255] The third through hole 303 forms a first sub-hole 311 in the first plate 31, and a second sub-hole 321 in the second plate 32. The first sub-hole 311 includes a first hole segment 3111 and a second hole segment 3112 that are connected. The first hole segment 3111 is located between the second cavity 102 and the second hole segment 3112. The diameter of the first hole segment 3111 is larger than the diameter of the second hole segment 3112, and the diameter of the second hole segment 3112 is smaller than the diameter of the second sub-hole 321. A stepped surface 3113 is formed between the first hole segment 3111 and the second hole segment 3112. The blocking member 40 includes a blocking part 41, which passes through the second sub-hole 321 and the first hole segment 3111. The blocking part 41 abuts against the stepped surface 3113. The blocking part 41 is an annular structure with a clearance hole 401 formed in the middle. The clearance hole 401 is connected to the third through hole 303. The blocking part 41 covers the first opening 304 and the second opening 305.

[0256] The blocking part 41 is made of stainless steel. The end of the blocking part 41 near the second sub-hole 321 is welded to the second plate 32 of the partition plate 30 along the circumference of the third through hole 303.

[0257] The first cavity 101 is provided with a beam 14, the beam 14 is provided with a fourth through hole 141, the fourth through hole 141 is connected to the clearance hole 401, and the connecting component 50 passes through the clearance hole 401 and the fourth through hole 141.

[0258] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0259] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Box; A partition is disposed inside the box, the partition is used to divide the inner cavity of the box into a first cavity and a second cavity, the partition includes a first plate and a second plate spaced apart, and a first rib connecting the first plate and the second plate, the first plate is located between the second plate and the first cavity, a third cavity and a fourth cavity are formed between the first plate and the second plate, and the first rib separates the third cavity and the fourth cavity; A battery cell assembly is disposed in the first cavity; the battery cell assembly includes multiple battery cells, among which a first battery cell and a second battery cell are included; the first battery cell is provided with a first pressure relief mechanism, the separator is provided with a first through hole, the first through hole penetrates the first plate and the second plate, and connects to the third cavity; the first pressure relief mechanism is disposed towards the second cavity through the first through hole, so that the first pressure relief mechanism can relieve pressure to the third cavity and the second cavity; the second battery cell is provided with a second pressure relief mechanism, the separator is provided with a second through hole, the second through hole penetrates... The first plate and the second plate are connected, and the second pressure relief mechanism is disposed towards the second cavity through the second through hole, so that the second pressure relief mechanism can relieve pressure to the fourth cavity and the second cavity; the first rib is located between the first through hole and the second through hole, and the partition plate is provided with a third through hole for the connecting component to pass through. The third through hole passes through the first plate, the second plate and the first rib, so that the partition plate forms a first opening that connects the third cavity and the third through hole, and a second opening that connects the fourth cavity and the third through hole; A blocking member, connected to the partition, the blocking member including a blocking portion covering at least a portion of the first opening and / or at least a portion of the second opening.

2. The battery device according to claim 1, characterized in that: The blocking part is an annular structure with a clearance hole formed in the middle, the clearance hole is connected to the third through hole, and the blocking part covers at least a portion of the first opening and at least a portion of the second opening.

3. The battery device according to claim 1, characterized in that: The third through hole penetrates the first plate to form a first sub-hole, the third through hole penetrates the second plate to form a second sub-hole, and the blocking part is provided in at least one of the first sub-hole and the second sub-hole.

4. The battery device according to claim 3, characterized in that: The minimum diameter of the first sub-hole is smaller than the diameter of the second sub-hole, the blocking part passes through the second sub-hole, and the blocking part abuts against the first plate.

5. The battery device according to claim 4, characterized in that: The first sub-hole includes a first hole segment and a second hole segment that are connected. The first hole segment is closer to the second cavity than the second hole segment. The diameter of the first hole segment is larger than the diameter of the second hole segment. The blocking part is inserted into the first hole segment. A stepped surface is formed between the first hole segment and the second hole segment. The blocking part abuts against the stepped surface.

6. The battery device according to any one of claims 1 to 5, characterized in that: The blocking member further includes a protrusion connected to the blocking portion. The protrusion protrudes from the outer side of the blocking portion and is located on the side of the second plate facing away from the first plate. The protrusion abuts against the surface of the second plate.

7. The battery device according to any one of claims 1 to 5, characterized in that: The blocking element is welded to the partition.

8. The battery device according to claim 7, characterized in that: The welding joint between the blocking member and the partition forms multiple welding structures, which are distributed circumferentially along the third through hole.

9. The battery device according to any one of claims 1 to 5, characterized in that: The battery cell assembly includes multiple rows of battery cells arranged along a first direction. Each row of battery cells includes multiple battery cells arranged in series along a second direction. In two adjacent rows of battery cells arranged in series, one row of battery cells includes the first battery cell, and the other row of battery cells includes the second battery cell. The first cavity and the second cavity are arranged at intervals along a third direction. The first rib extends along the second direction. The first direction is perpendicular to the second direction and the third direction, and the second direction is perpendicular to the third direction.

10. The battery device according to any one of claims 1 to 5, characterized in that: The battery device further includes a connecting component. A beam is provided in the first cavity. The beam has a fourth through hole that communicates with the third through hole. The connecting component passes through the third through hole and the fourth through hole. The blocking part avoids the connecting component.

11. The battery device according to any one of claims 1 to 5, characterized in that: The enclosure includes a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to opposite sides of the frame. The partition is connected to the frame and located between the top cover and the bottom plate. The partition and the top cover form a first cavity, and the partition and the bottom plate form a second cavity.

12. The battery device according to any one of claims 1 to 5, characterized in that: The material of the blocking element includes at least one of stainless steel and mica.

13. An electrical device, characterized in that: The battery device includes any one of claims 1 to 12.

Images