Battery device and electric device

Abstract

The embodiment of the invention discloses a battery device and a power utilization device, the battery device comprises a box body, and the box body comprises a first wall; the plurality of single batteries are accommodated in the box body, each single battery comprises a second wall, the second wall is arranged opposite to the first wall, and the first wall is provided with a pressure relief mechanism and at least two electrode terminals; the buffer part is arranged on the second wall, and the orthographic projection of the buffer part in the first direction is located between the orthographic projections of the at least two electrode terminals in the first direction and located outside the orthographic projection of the pressure relief mechanism in the first direction; wherein the first direction is the thickness direction of the second wall, and the buffer component is configured to be capable of generating elastic deformation along the first direction so as to provide guarantee for the interior of the battery device in a complex environment.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device and an electrical device. Background Technology

[0002] As the application fields of power batteries continue to expand, the market demand for them is also constantly increasing. During use and transportation, battery devices are constantly exposed to vibration and complex environments, leading to growing concern about issues arising from vibration and pressure on the top of the battery during these processes.

[0003] Therefore, how to provide protection for the complex environment inside the battery device has become an urgent problem to be solved. Summary of the Invention

[0004] This application provides a battery device and an electrical device that can provide protection for the battery device in complex environments.

[0005] In a first aspect, this application provides a battery device, comprising: a housing including a first wall; a plurality of battery cells housed in the housing, each battery cell including a second wall disposed opposite to the first wall, the first wall having a pressure relief mechanism and at least two electrode terminals; and a buffer member disposed on the second wall, the orthographic projection of the buffer member along a first direction located between the orthographic projections of the at least two electrode terminals along the first direction and outside the orthographic projection of the pressure relief mechanism along the first direction; wherein the first direction is the thickness direction of the second wall, and the buffer member is configured to be elastically deformable along the first direction.

[0006] In the technical solution of this application embodiment, the orthographic projection of the buffer component along the first direction is located between the orthographic projections of at least two electrode terminals along the first direction, and the orthographic projection of the buffer component along the first direction is outside the orthographic projection of the pressure relief mechanism along the first direction. The first wall of the battery device is supported and buffered by the buffer component. When the first wall of the battery device is pressed down, sufficient venting space of the pressure relief mechanism can be achieved, thereby reducing or avoiding battery safety problems caused by poor venting.

[0007] In some possible embodiments, the space enclosed by the buffer member and the first and second walls is at least partially open.

[0008] In some embodiments, a plurality of battery cells are arranged along a second direction, and the buffer component includes a first buffer portion that extends along the second direction. The orthographic projection of the first buffer portion along a first direction is located between the orthographic projection of the first electrode terminals of the plurality of battery cells along the first direction and the orthographic projection of the pressure relief mechanism along the first direction, wherein the second direction and the first direction are perpendicular to each other.

[0009] In this embodiment, the buffer component is arranged in a strip between the first electrode terminal of multiple battery cells and the pressure relief mechanism. Only one buffer component needs to be set for the multiple battery cells to effectively buffer the first wall of the battery device. Setting one buffer component for the multiple battery cells as a whole simplifies the manufacturing process of the buffer component and simplifies the process of fixing the buffer component, thereby saving processing costs.

[0010] In some embodiments, the buffer component includes a second buffer portion, the orthographic projection of which along a first direction is located between the orthographic projections of adjacent pressure relief mechanisms along the first direction.

[0011] In this embodiment, the second buffer is disposed between adjacent pressure relief mechanisms, and plays a buffering role between the pressure relief mechanisms. The buffering effect is more direct and better, and it can better provide exhaust space for the pressure relief mechanism.

[0012] In some embodiments, a plurality of battery cells are arranged along a second direction, and the buffer component further includes a third buffer portion extending along the second direction, wherein the orthographic projection of the third buffer portion along the first direction is located between the orthographic projection of the second electrode terminal of the battery cell along the first direction and the orthographic projection of the pressure relief mechanism along the first direction, wherein the second direction and the first direction are perpendicular to each other.

[0013] In this embodiment, the first buffer section and the third buffer section are respectively located between the two electrode terminals and the pressure relief mechanism. The symmetrical buffers formed on both sides of the pressure relief mechanism provide more reliable venting space when the first wall is pressed down, further improving battery safety performance.

[0014] In some embodiments, the elastic modulus x of the buffer component is in the range of 1 kPa ≤ x ≤ 5 GPa.

[0015] In some embodiments, the buffer component includes a multi-layer structure disposed along a first direction, wherein the elastic modulus x of at least one layer of the multi-layer structure is in the range of 1 kPa ≤ x ≤ 5 GPa.

[0016] In this embodiment, the buffer component adopts a multi-layer structure, which can provide sufficient buffering for elastic deformation and other properties at the same time, such as providing sufficient support between the first wall and the second wall.

[0017] In some embodiments, at least one layer of the multilayer structure includes an insulating layer.

[0018] In this embodiment, at least one layer of the multi-layer structure of the buffer component is an insulating layer, thereby achieving insulation between the battery device housing and the individual battery cells, reducing or avoiding problems caused by the housing being charged.

[0019] In some embodiments, the second wall includes a protrusion that protrudes toward the first wall and is located between at least two electrode terminals; a buffer member is at least partially disposed on the surface of the protrusion toward the first wall.

[0020] In this embodiment, since the electrode terminals occupy part of the height, the second wall of the battery cell is provided with a protrusion, which makes full use of part of the space between the electrode terminals in the space between the first wall and the second wall, providing more space inside the battery cell, improving the space utilization rate of the battery cell, and thus improving the energy density of the battery device.

[0021] On the other hand, since the protrusion on the second wall of the battery cell will significantly occupy the venting space of the pressure relief mechanism, the problem of the first wall being pressed down is particularly prominent. By setting a buffer component on the surface of the protrusion facing the first wall, the problem of insufficient venting space of the pressure relief mechanism can be alleviated.

[0022] In some embodiments, a groove is formed between the protrusions of adjacent battery cells, and a buffer member is at least partially disposed in the groove.

[0023] In this embodiment of the application, by providing at least a portion of the buffer component in the groove formed between the protrusions of adjacent battery cells, the movement of the buffer component along the second direction can be restricted, thereby better fixing the buffer component and reducing the possibility of the buffer component falling off.

[0024] In some embodiments, the orthographic projection of the portion of the buffer member disposed in the groove along the first direction is located within the range of the orthographic projection of the portion of the buffer member disposed outside the groove along the first direction.

[0025] In this embodiment, the buffer component is at least partially disposed in the groove formed between the protrusions 26 of adjacent battery cells, and the orthographic projection of the portion of the buffer component in the groove along the first direction is within the range of the orthographic projection of the portion outside the groove along the first direction, thereby simplifying the processing of the buffer component, which only requires cutting out the recessed portion, thus saving processing costs.

[0026] In some embodiments, the battery device further includes a first heat insulation portion covering the surface of the buffer member facing the pressure relief mechanism, wherein the first heat insulation portion is an insulating structure.

[0027] In the event of thermal runaway in a battery cell, the pressure relief mechanism releases high-temperature fumes and contents that impact the buffer components, potentially causing softening or carbonization of the buffer components and leading to buffer failure, further increasing safety risks. Therefore, this embodiment of the application reduces the possibility of decreased buffering effectiveness by covering the surface of the buffer components facing the pressure relief mechanism with a first heat insulation portion.

[0028] In some embodiments, the battery device further includes a second heat insulation portion connected to the first heat insulation portion, the second heat insulation portion at least partially covering the surface of the buffer member facing the first wall.

[0029] In this embodiment, the second heat insulation portion further covers at least a portion of the surface of the buffer component facing the first wall, thereby providing better thermal protection for the buffer component and further reducing the possibility of a decrease in buffering effect.

[0030] In some embodiments, the distance d between the orthographic projection of the buffer component along the first direction and the orthographic projection of the pressure relief mechanism along the first direction is ≤20mm.

[0031] In this embodiment, the distance d between the orthographic projection of the buffer component along the first direction and the orthographic projection of the pressure relief mechanism along the first direction is ≤20mm, so that the buffer component is close to the pressure relief mechanism, providing sufficient exhaust height for the pressure relief mechanism to meet the exhaust space requirements, and avoiding the buffer component being too far away from the pressure relief mechanism, which would weaken the buffering effect.

[0032] In some embodiments, the distance H between the surface of the buffer member facing the first wall and the surface of the buffer member facing the second wall is in the range of 2mm ≤ H ≤ 10mm.

[0033] In this embodiment, the distance H between the surface of the buffer component facing the first wall and the surface of the buffer component facing the second wall is in the range of 2mm≤H≤10mm, which can balance the buffering performance and the utilization of the internal space of the battery device. If H is too small, it cannot provide enough venting space, and if H is too large, it will encroach on the internal space of the battery device.

[0034] In a second aspect, an electrical device is provided, comprising: a battery device as described in any implementation of the first aspect.

[0035] In some embodiments, the electrical device is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a vehicle according to one embodiment of this application;

[0037] Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of this application;

[0038] Figure 3 An exploded schematic diagram of a battery cell provided in an embodiment of this application is shown;

[0039] Figure 4 This is a top view of a battery device provided in an embodiment of this application;

[0040] Figure 5 yes Figure 4 One possible scenario for the detailed drawing of section D in the middle;

[0041] Figure 6 yes Figure 4 One possible scenario for the BB cross-section;

[0042] Figure 7 This is a partial schematic isometric view of a battery device provided in certain embodiments of this application;

[0043] Figure 8 yes Figure 6 One possible scenario for the detailed drawing of section C;

[0044] Figure 9 This is a partial isometric view of a battery device provided in certain embodiments of this application.

[0045] Figure 10 This is a partial isometric view of a battery device provided in certain embodiments of this application;

[0046] Figure 11 yes Figure 6 Another possible scenario for the detailed drawing of section C;

[0047] Figure 12 yes Figure 6 Another possible scenario for the detailed diagram of section C;

[0048] Figure 13 This is a partial isometric view of a battery device provided in certain embodiments of this application;

[0049] Figure 14 This is a partial isometric view of a battery device provided in certain embodiments of this application;

[0050] Figure 15 This is a partial isometric view of a battery device provided in certain embodiments of this application;

[0051] Figure 16 yes Figure 6 Another possible scenario for the detailed diagram of section C;

[0052] Figure 17 This is a partial isometric view of a battery device provided in certain embodiments of this application.

[0053] The accompanying drawings are not drawn to scale.

[0054] Detailed Explanation of Reference Numerals

[0055] 1. Vehicle; 10. Battery assembly; 11. Housing; 110. First housing section; 111. First wall; 120. Second housing section; 121. Frame; 122. Base plate; 130. Buffer component; 131. First buffer section; 132. Second buffer section; 133. Third buffer section; 140. Busbar component; 150. First heat insulation section; 151. Second heat insulation section; 20. Battery cell; 21. Housing; 22. End cap; 222. Second wall; 23. Electrode terminal; 23a. First electrode terminal; 23b. Second electrode terminal; 24. Pressure relief mechanism; 25. Electrode assembly; 251. Main body; 252. Tab; 252a. First tab; 252b. Second tab; 26. Protrusion; 30. Controller; 40. Motor. Detailed Implementation

[0056] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0059] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0062] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0063] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0064] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0065] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0066] The battery device 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, which are connected in series, parallel, or mixed connections via a busbar.

[0067] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0068] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0069] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0070] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0071] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0072] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0073] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0074] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0075] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0076] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0077] The battery cell 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.

[0078] In some embodiments, the battery cell has a casing, which may include a housing and an end cap. The casing of the battery cell is provided with at least one electrode terminal, which is electrically connected to a tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collector. The electrode terminal may be located on the end cap or on the housing.

[0079] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0080] As an example, the internal pressure or temperature of a battery cell 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 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating 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.

[0081] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0082] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0083] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0084] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0085] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0086] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0087] During use and transportation, the top cover of the battery device may be pressed down into the battery due to vibration or force, thus encroaching on the pressure relief and venting space of the individual battery cells. In severe cases, this can lead to poor venting of the individual battery cells and cause the battery to explode.

[0088] To provide sufficient venting space for the battery cells, the battery device provided in this application embodiment includes a housing with a first wall; the battery device also includes multiple battery cells housed in the housing, each battery cell including a second wall, which is disposed opposite to the first wall, and the first wall is provided with a pressure relief mechanism and at least two electrode terminals; the battery device also includes a buffer component disposed on the second wall, the orthographic projection of the buffer component along a first direction being located between the orthographic projections of the two electrode terminals along the first direction, and outside the orthographic projection of the pressure relief mechanism along the first direction; wherein, the first direction is perpendicular to the first wall, the buffer component undergoes elastic deformation along the first direction, and the space enclosed by the buffer component, the first wall, and the second wall is open on at least one side.

[0089] In such a battery device, the portion of the battery device corresponding to the electrode terminals is supported and cushioned by a buffer component, especially the area around the pressure relief mechanism. When the battery device's top cover is pressed down, the support and cushioning of the portion of the battery device corresponding to the electrode terminals ensures sufficient venting space for the pressure relief mechanism, thereby reducing or avoiding battery safety issues caused by poor venting.

[0090] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0091] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0092] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0093] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 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 motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0094] Figure 2 A partial structural schematic diagram of the battery device 10 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The square-shell battery shown may also be different. Figure 2 Other shapes are shown, but the embodiments of this application are not limited to these.

[0095] It should be understood that, such as Figure 2 As shown, the battery device 10 in this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 20. The housing 11 in this embodiment has a hollow internal structure, and the multiple battery cells 20 are accommodated within the housing 11. The housing 11 may include multiple parts, such as... Figure 2 The housing 11 shown may include three parts, referred to herein as a first housing portion 110, a frame 121, and a base plate 122. These three parts are merely illustrative and should not constitute an undue limitation on this application; in other embodiments, these three parts may have other names. In some embodiments, the housing 11 may also include two parts, referred herein as a first housing portion 110 and a second housing portion 120, which are fastened together. The shapes of the first housing portion 110 and the second housing portion 120 may be determined according to the shape of the components housed inside, for example, according to the shape of a combination of multiple battery cells 20 housed inside. At least one of the first housing portion 110 and the second housing portion 120 has an opening. For example, as... Figure 2As shown, the first housing portion 110 is plate-shaped, and the second housing portion 120 can be integrally formed or composed of a frame 121 and a base plate 122; this embodiment does not limit the specific form. The second housing portion 120 can be a hollow cuboid with one open side, and the first housing portion 110 and the second housing portion 120 are interlocked to form a housing 11 with a closed cavity, which can accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed within the housing 11 formed by the interlocking of the first housing portion 110 and the second housing portion 120.

[0096] For example, unlike Figure 2 As shown, both the first box section 110 and the second box section 120 can be hollow cuboids with openings.

[0097] Figure 3 An exploded view of a battery cell provided in an embodiment of this application is shown.

[0098] In some embodiments, the battery cell 20 may include a housing 21. The housing 21 may be a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the battery cell may also include an end cap 22, the housing 21 having an opening, the end cap 22 covering the opening, and the end cap 22 and the housing 21 forming a sealed structure for encapsulating the electrode assembly 25 and electrolyte components, etc.

[0099] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell 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.

[0100] The housing 21 may have one or more openings. The end cap 22 may also have one or more. The electrode assembly 25 includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of a single battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. The electrode assembly 25 may include tabs 252 and a body 251. Tabs 252 may include a first tab 252a and a second tab 252b, with the first tab 252a and the second tab 252b having opposite polarities. For example, the first tab 252a may be a positive tab, and the second tab 252b may be a negative tab; however, this embodiment does not limit this.

[0101] In some embodiments, the housing 21 is provided with at least two electrode terminals 23, each including at least one first electrode terminal 23a and at least one second electrode terminal 23b, wherein the first electrode terminal 23a and the second electrode terminal 23b have opposite polarities. For example, the first electrode terminal 23a can be a positive electrode terminal, and the second electrode terminal 23b can be a negative electrode terminal; or, the first electrode terminal 23a can be a negative electrode terminal, and the second electrode terminal 23b can be a positive electrode terminal. The positive electrode terminal is used for electrical connection to the positive electrode tab of the electrode assembly 25, and the negative electrode terminal is used for electrical connection to the negative electrode tab of the electrode assembly 25. The positive electrode terminal and the positive electrode tab can be directly connected or indirectly connected, and the negative electrode terminal and the negative electrode tab can be directly connected or indirectly connected. The electrode terminals 23 can be connected to the busbar component 140, thereby realizing the connection between the battery cells 20.

[0102] In some embodiments, the housing 21 is provided with a pressure relief mechanism 24 to release the internal gas of the battery cell.

[0103] The following is combined Figures 2 to 6 This application describes a battery device provided in one embodiment.

[0104] in, Figure 4 This is a top view of a battery device provided in an embodiment of this application. Figure 5 yes Figure 4 A possible detailed view of part D in the middle. Figure 6 yes Figure 4 One possible scenario for the BB cross-section.

[0105] refer to Figure 2 The battery device 10 may include a housing 11, which includes a first wall 111. The housing 11 contains a plurality of individual battery cells 20. (See reference...) Figure 3 and further reference Figure 2 , 4 5 and 6, the battery cell 20 may include a second wall 222, which is disposed opposite to the first wall. The second wall 222 is provided with a pressure relief mechanism 24 and at least two electrode terminals 23. The battery device 10 also includes a buffer member 130, which is disposed on the second wall 222. The orthographic projection of the buffer member 130 along the first direction Z is located between the orthographic projections of the at least two electrode terminals 23 along the first direction Z, and the orthographic projection of the buffer member 130 along the first direction Z is outside the orthographic projection of the pressure relief mechanism 24 along the first direction Z. The buffer member 130 is capable of elastic deformation along the first direction Z.

[0106] Optionally, the space enclosed by the buffer member 130, the first wall 111, and the second wall 222 is at least partially open.

[0107] In this embodiment, the first wall 111 can be the top plate or top cover of the battery device 10. When the first housing portion 110 is a plate-shaped structure, the first wall 111 can also be the first housing portion 110 itself. This application does not limit this. Here, the top plate or top cover refers to the wall opposite to the end cap 22 of the battery cell 20 or the wall where the electrode terminals 23 and the pressure relief mechanism 24 are disposed when the battery cell 20 is housed.

[0108] The second wall 222 in this embodiment can be a wall of the housing 21 or an end cap 22, and this application does not limit it.

[0109] The buffer component 130 in this embodiment refers to a component with a buffering function, which can buffer the downward pressure of the battery device 10 cover. The buffer component 130 can be partially or entirely made of elastic material, which refers to a material with good compressibility, thereby providing considerable buffering effect. In some cases, such as when the compression ratio is large, it can also have a supporting function. The buffer component 130 can be buffer foam, and the material of the buffer foam can be elastic materials such as fluororubber and silicone rubber. Foam has a series of advantages such as convenient use, flexible bending, ultra-thin volume, heat and pressure resistance, and reliable performance, which can meet the requirements of the buffer component 130 in this embodiment of the invention. The foam compression ratio can reach 80%, which can effectively buffer components with large mass.

[0110] In this embodiment of the application, the first direction Z refers to the direction perpendicular to the second wall 222, or the thickness direction of the second wall 222.

[0111] In the embodiments of this application, the orthographic projection along the first direction Z refers to the projection along the first direction Z onto a plane perpendicular to the first direction Z.

[0112] The fact that the orthographic projection of the buffer component 130 along the first direction Z is outside the orthographic projection of the pressure relief mechanism 24 along the first direction Z means that the buffer component 130 does not occupy the space above the pressure relief mechanism 24, thereby avoiding the exhaust space of the pressure relief mechanism 24.

[0113] The buffer component 130 can be disposed on the second wall 222 of one or more battery cells 20, or it can be disposed on the second wall 222 of all battery cells 20. The buffer component 130 can be a continuous component or a component disposed separately on different battery cells 20.

[0114] The buffer component 130 can be fixedly connected to the second wall 222, and the fixed connection can be achieved by bonding.

[0115] In some possible embodiments, the bonding method between the buffer member 130 and the second wall 222 may be to provide an adhesive layer on the surface of the buffer member 130 facing the second wall 222, thereby bonding it to the second wall 222; or the adhesive layer may be applied to the position on the second wall 222 corresponding to the location where the buffer member 130 is provided, thereby bonding the buffer member 130 to the second wall 222. This application does not limit this method.

[0116] The ability of the buffer member 130 to undergo elastic deformation along the first direction Z can be understood as the ability of the buffer member 130 to deform and generate stress when subjected to a force along the first direction Z, and the buffer member tending to return to its original state after the applied force is removed. The buffer member 130 may contact the first wall 111; for example, in the assembled battery device 10, the buffer member 130 may be compressed by the first wall 111 to contact the first wall 111 and the second wall 222. Alternatively, the buffer member 130 may not contact the first wall 111. In the assembled battery device 10, the buffer member 130 is in its original state, and is only compressed when the first wall 111 is pressed down, thus buffering the downward pressure of the first wall 111.

[0117] Optionally, the elastic modulus x of the buffer component 130 is in the range of 1 kPa ≤ x ≤ 5 GPa. "Elastic modulus" can be Young's modulus, which can be considered as the deformation of the buffer component 130 under the force in the first direction Z. Within this range, the elastic modulus of the buffer component 130 can provide cushioning and protection. If the elastic modulus of the buffer component 130 is too large, it will be in rigid contact with the second wall and will have no cushioning capacity; if the elastic modulus of the buffer component 130 is too small, it will not provide support and will not provide cushioning.

[0118] Furthermore, the elastic modulus x of the buffer component 130 is in the range of 5 kPa ≤ x ≤ 1 GPa. Within this range, the buffer component 130 provides better cushioning and support. If the elastic modulus of the buffer component 130 is greater than this range, it is less prone to deformation and more likely to damage the battery device 10. If the elastic modulus of the buffer component 130 is less than this range, it provides less support and the cushioning effect is not significant.

[0119] In some embodiments, the elastic modulus x of the buffer component 130 may also be other values. For example, the value of x may be any one of the following values ​​or between any two of the following values: 5 GPa, 4 GPa, 3 GPa, 2 GPa, 1 GPa, 500 MPa, 200 MPa, 100 MPa, 50 MPa, 20 MPa, 10 MPa, 5 MPa, 1 MPa, 500 kPa, 200 kPa, 100 kPa, 50 kPa, 20 kPa, 10 kPa, 5 kPa, 2 kPa, and 1 kPa.

[0120] The fact that the space enclosed by the buffer component 130, the first wall 111, and the second wall 222 is at least partially open can be understood as the space being non-enclosed. In some possible embodiments, the fact that the space enclosed by the buffer component 130, the first wall 111, and the second wall 222 is at least partially open can mean that at least one side of the space is open. In some possible embodiments, the fact that the space enclosed by the buffer component 130, the first wall 111, and the second wall 222 is at least partially open can mean that the buffer component 130 is provided with a through hole, thereby allowing the space enclosed by the buffer component 130, the first wall 111, and the second wall 222 to communicate with the outside.

[0121] In this embodiment, the orthographic projection of the buffer component 130 along the first direction Z is located between the orthographic projections of at least two electrode terminals 23 along the first direction Z, and the orthographic projection of the buffer component 130 along the first direction Z is outside the orthographic projection of the pressure relief mechanism 24 along the first direction Z. The first wall 111 of the battery device 10 is supported and buffered by the buffer component 130. When the first wall 111 of the battery device 10 is pressed down, sufficient venting space of the pressure relief mechanism can be achieved, thereby reducing or avoiding battery safety problems caused by poor venting.

[0122] Please refer to the above. Figure 7 and Figure 8 ,in, Figure 7 This is a partial schematic isometric view of a battery device provided in one embodiment of this application. Figure 8 yes Figure 6 A possible detailed view of part C. In some possible embodiments, multiple battery cells are arranged along a second direction X, wherein the second direction X and the first direction Z are perpendicular to each other, and the buffer member 130 may include a first buffer portion 131. The first buffer portion 131 may extend along the second direction X. The orthographic projection of the first buffer portion 131 along the first direction Z is located between the orthographic projection of the first electrode terminal 23a of the multiple battery cells along the first direction Z and the orthographic projection of the pressure relief mechanism 24 along the first direction Z.

[0123] The buffer member 130 extending along the second direction X can be understood as the buffer member 130 being arranged along the direction in which the plurality of battery cells 20 are arranged, thereby being disposed on the second wall 222 of the plurality of battery cells 20. That is, the buffer member 130 is strip-shaped and located between the first electrode terminal 23a and the pressure relief mechanism 24.

[0124] The first electrode terminal 23a can be either a positive electrode terminal or a negative electrode terminal; this application does not limit this.

[0125] In this embodiment, the buffer component 130 is arranged in a strip between the first electrode terminal 23a of multiple battery cells and the pressure relief mechanism 24. Only one buffer component needs to be arranged as a whole for the multiple battery cells to effectively buffer the first wall 111 of the battery device 10. The process of processing the buffer component 130 is simple and the process of fixing the buffer component 130 is simplified, thereby saving processing costs.

[0126] refer to Figure 9 ,in, Figure 9 This is a partial isometric view of a battery device provided in another embodiment of this application. The buffer member 130 may include a second buffer portion 132, the orthographic projection of which, along the first direction Z, is located between the orthographic projections of the adjacent pressure relief mechanism 24 along the first direction Z. That is, the second buffer portion 132 extends along a third direction Y, perpendicular to the first direction Z and the second direction X.

[0127] although Figure 9 The second buffer 132 is not shown, but it can be provided independently, that is, it can be provided without the first buffer 131. The second buffer 132 can also be provided without being connected to the first buffer 131.

[0128] In this embodiment, the second buffer 132 is disposed between adjacent pressure relief mechanisms 24, and plays a buffering role between the pressure relief mechanisms 24. The buffering role is more direct and the buffering effect is better, which can better provide exhaust space for the pressure relief mechanism 24.

[0129] Optionally, the buffer component 130 includes a first buffer portion 131 and a second buffer portion 132, and the first buffer portion 131 and the second buffer portion 132 are connected.

[0130] In this embodiment, the first buffer part 131 and the second buffer part 132 are connected, and can be processed as a whole during processing and fixed in one go during fixing, which simplifies the process and saves processing costs.

[0131] refer to Figure 10 And further reference Figure 11 ,in, Figure 10 This is a partial isometric view of a battery device provided in another embodiment of this application. Figure 11 yes Figure 6 Another possible scenario for the detailed drawing of part C. The buffer component 130 may include a first buffer portion 131 and a third buffer portion 133, the third buffer portion 133 extending along the second direction, and the orthographic projection of the third buffer portion 133 along the first direction Z is located between the orthographic projection of the second electrode terminal 23b of the battery cell along the first direction Z and the orthographic projection of the pressure relief mechanism along the first direction Z.

[0132] The second electrode terminal 23b refers to the electrode terminal with the opposite polarity to the first electrode terminal 23a.

[0133] In this embodiment, the first buffer portion 131 and the third buffer portion 133 are respectively located between the two electrode terminals and the pressure relief mechanism 24. The symmetrical buffer formed on both sides of the pressure relief mechanism 24 can more reliably provide the pressure relief mechanism 24 with venting space when the first wall 111 is pressed down, thereby further improving the battery safety performance.

[0134] In some possible embodiments, the buffer member 130 may include a first buffer portion 131, a second buffer portion 132, and a third buffer portion 133. When the first buffer portion 131, the second buffer portion 132, and the third buffer portion 133 are provided simultaneously, through holes may be provided on the surface of the buffer member 130 to connect the space enclosed by the buffer member 130 and the first wall 111 and the second wall 222 with the outside.

[0135] refer to Figure 12 ,in, Figure 12 yes Figure 6 Another possible scenario for the detailed drawing of section C. The buffer member 130 may be a structure using the same material along the first direction Z, and the buffer member 130 may also include a multi-layered structure arranged along the first direction Z. At least one layer of the multi-layered structure can undergo elastic deformation along the first direction Z. For example, with... Figure 12 For example, Figure 12 The buffer component 130 includes a two-layer structure, one layer of which can elastically deform along the first direction Z, and the other layer can be flexibly configured, for example, as a rigid structure to provide sufficient support between the first wall 111 and the second wall 222. The buffer component 130 may also include a structure with more layers, and the embodiments of this application are not limited thereto.

[0136] In some possible embodiments, the elastic modulus x of at least one layer of the multilayer structure is in the range of 1 kPa ≤ x ≤ 5 GPa.

[0137] In this embodiment, the buffer component 130 adopts a multi-layer structure, which can provide sufficient buffering for elastic deformation and other properties at the same time, such as providing sufficient support between the first wall 111 and the second wall 222.

[0138] In some possible embodiments, the buffer component 130 has a multi-layer structure, and at least one layer of the multi-layer structure may be an insulating layer.

[0139] In this embodiment, at least one layer of the multilayer structure of the buffer component 130 is an insulating layer, thereby achieving insulation between the housing 11 of the battery device 10 and the battery cell 20, reducing or avoiding problems caused by the housing 11 being charged.

[0140] In some embodiments, the distance d between the orthographic projection of the buffer component 130 along the first direction Z and the orthographic projection of the pressure relief mechanism along the first direction Z is ≤20mm.

[0141] The distance d between the orthographic projection of the buffer component 130 along the first direction Z and the orthographic projection of the pressure relief mechanism along the first direction Z can be the distance between the buffer component 130 and the pressure relief mechanism in any direction of the circumference.

[0142] In this embodiment, the distance d between the orthographic projection of the buffer component 130 along the first direction Z and the orthographic projection of the pressure relief mechanism 24 along the first direction Z is ≤20mm, so that the buffer component 130 is close to the pressure relief mechanism 24, providing sufficient exhaust height for the pressure relief mechanism 24 to meet the requirements of exhaust space, and avoiding the buffer component 130 being too far away from the pressure relief mechanism 24, which would weaken the buffering effect.

[0143] Furthermore, the distance d between the orthographic projection of the buffer component 130 along the first direction Z and the orthographic projection of the pressure relief mechanism 24 along the first direction Z can satisfy d≤10mm. Within this range, the buffer component 130 is closer to the pressure relief mechanism 24, which can reduce the downward pressure height of the first wall 111 within the area enclosed by the buffer component, thus providing better buffering.

[0144] In some embodiments, the range of d can also be other values. For example, the value of d can be any one of the following values ​​or between any two of the following values: 20mm, 18mm, 16mm, 14mm, 12mm, 10mm, 8mm, 6mm, 4mm, 2mm, 1mm, 0.5mm, and 0mm.

[0145] refer to Figure 13 and Figure 14 ,in, Figure 13 This is a partial isometric view of a battery device provided in certain embodiments of this application. Figure 14 This is a partial isometric view of a battery device provided in certain embodiments of this application. In some possible embodiments, the second wall 222 of the battery cell 20 includes a protrusion 26 that protrudes toward the first wall 111 and is located between at least two electrode terminals 23. A buffer member 130 is at least partially disposed on the surface of the protrusion 26 toward the first wall 111.

[0146] The buffer member 130 is at least partially disposed on the surface of the protrusion 26 facing the first wall 111. This can be understood as the buffer member 130 being partially disposed on the surface of the protrusion 26 facing the first wall 111, or being disposed entirely on the surface of the protrusion 26 facing the first wall 111.

[0147] In this embodiment, since the electrode terminals 23 occupy part of the height, the second wall 222 of the battery cell 20 is provided with a protrusion 26, which makes full use of the space between the first wall 111 and the second wall 222, and the space between the electrode terminals 23, providing more space inside the battery cell 20, improving the space utilization rate of the battery cell 20, thereby improving the energy density of the battery device 10.

[0148] On the other hand, since the protrusion 26 on the second wall 222 of the battery cell 20 will occupy a large amount of the exhaust space of the pressure relief mechanism 24, the problem of the first wall 111 being pressed down is particularly prominent. By providing a buffer member 130 on the surface of the protrusion 26 facing the first wall 111, the problem of insufficient exhaust space of the pressure relief mechanism 24 can be alleviated.

[0149] In some possible embodiments, the protrusion 26 of the battery cell 20 can be a single unit, that is, there is only one protrusion 26 in a battery cell 20, and the pressure relief mechanism 24 can be disposed on the protrusion 26.

[0150] The area of ​​the orthographic projection of the protrusion 26 along the first direction Z can be set according to actual needs. For example, if additional heat-conducting components or housing components are required, the area of ​​the orthographic projection of the protrusion 26 along the first direction Z can be determined based on the area of ​​the orthographic projection of the corresponding component along the first direction Z. Other methods can also be used to determine the area of ​​the orthographic projection of the protrusion 26 along the first direction Z, and this embodiment is not limited thereto.

[0151] In the embodiments of this application, such as Figure 13 As shown, the protrusion 26 is an integral structure, which is convenient to process, the mold design is simple and not easily damaged, and it can be formed in one piece. The pressure relief mechanism 24 is set in the protrusion 26, which makes greater use of space and improves the energy density of the battery device 10.

[0152] In some possible embodiments, such as Figure 14 As shown, the protrusion 26 can be a plurality of protrusions on the surface of the second wall 222. These protrusions can be configured as needed to provide additional accommodating space for components inside the battery cell. For example, the components inside the battery cell can be heat dissipation devices that conduct heat generated by the electrode assembly 25 to the housing 21. The components inside the battery cell can also be other components, which are not limited in this embodiment.

[0153] In some possible embodiments, the first wall 111 may also be provided with a housing protrusion facing the outside of the battery device 10, the orthographic projection of the housing protrusion along the first direction Z surrounds the orthographic projection of the protrusion 26 along the first direction Z, thereby giving more space inside the battery device 10.

[0154] In some possible embodiments, a groove is formed between the protrusions 26 of adjacent battery cells 20, and the buffer member 130 is at least partially disposed in the groove.

[0155] The buffer component 130 may occupy only part of the groove space or fill the entire groove space.

[0156] In this embodiment of the application, by providing at least a portion of the buffer member 130 in the groove formed between the protrusions 26 of adjacent battery cells 20, the movement of the buffer member 130 along the second direction X can be restricted, thereby better fixing the buffer member 130 and reducing the possibility of the buffer member 130 falling off.

[0157] refer to Figure 15 , Figure 15 This is a partial isometric view of a battery device provided in certain embodiments of this application.

[0158] In some possible embodiments, the orthographic projection of the portion of the buffer member 130 disposed in the groove along the first direction Z is within the range of the orthographic projection of the portion of the buffer member 130 disposed outside the groove along the first direction Z. That is, the portion of the buffer member 130 disposed in the groove is located below the portion of the buffer member 130 disposed outside the groove and does not exceed the range of the projection of the portion outside the groove.

[0159] In this embodiment, the buffer member 130 is at least partially disposed in the groove formed between the protrusions 26 of adjacent battery cells 20, and the orthographic projection of a portion of the buffer member 130 in the groove along the first direction Z is within the range of the orthographic projection of the portion outside the groove along the first direction Z, thereby simplifying the processing of the buffer member 130, requiring only the recessed portion to be cut out, thus saving processing costs.

[0160] refer to Figure 16 and further reference Figure 17 ,in, Figure 16 yes Figure 6 Another possible scenario for the detailed diagram of section C; Figure 17 This is a partial isometric view of a battery device provided in certain embodiments of this application. The battery device 10 may also include a first heat insulation portion 150, which covers the surface of the buffer member 130 facing the pressure relief mechanism 24.

[0161] The first heat insulation part 150 can be a structure made of a material with heat insulation properties, such as a heat insulation film or a heat insulation coating. Materials with heat insulation properties can also be called thermally insulating materials, and can refer to materials with low thermal conductivity, such as mica paper, ceramic silicone rubber film, PI film, inorganic ceramic coatings, etc. This application is not limited to these; other materials with thermal conductivity lower than 0.6 W / (m*K) can also be considered as possible implementations of this application. Thermal conductivity refers to the amount of heat transferred per unit time per unit area when the temperature difference between the two sides of a unit thickness material is one degree under stable heat transfer conditions. Further, the first heat insulation part 150 can be made of a material with a thermal conductivity less than 0.3 W / (m*K). Preferably, the first heat insulation part 150 can be made of a material with a thermal conductivity less than 0.12 / (m*K).

[0162] In the event of thermal runaway of the battery cell 20, the pressure relief mechanism 24 will release high-temperature fumes and contents that impact the buffer component 130, potentially causing the buffer component 130 to soften or carbonize, thereby leading to buffer failure and further increasing safety risks. Therefore, in this embodiment, the first heat insulation part 150 covers the surface of the buffer component 130 facing the pressure relief mechanism 24 to reduce the possibility of a decrease in buffering effect.

[0163] In some possible embodiments, the first heat insulation part 150 is an insulating structure, thereby preventing the housing 11 from becoming electrified when the first heat insulation part 150 comes into contact with the first wall 111.

[0164] Furthermore, in some possible embodiments, the battery device further includes a second heat insulation portion 151 connected to the first heat insulation portion 150. The second heat insulation portion 151 at least partially covers the surface of the buffer member 130 facing the first wall 111.

[0165] In this embodiment, the second heat insulation part 151 further covers at least a portion of the surface of the buffer member 130 facing the first wall 111, thereby providing better thermal protection for the buffer member 130 and further reducing the possibility of a decrease in buffering effect.

[0166] In some possible embodiments, the distance H between the surface of the buffer member 130 facing the first wall 111 and the surface of the buffer member 130 facing the second wall 222 is in the range of 2mm ≤ H ≤ 10mm.

[0167] In this embodiment, the distance H between the surface of the buffer component 130 facing the first wall 111 and the surface of the buffer component 130 facing the second wall 222 is in the range of 2mm≤H≤10mm, which can balance the buffering performance and the utilization of the internal space of the battery device 10. If H is too small, it cannot provide enough exhaust space, and if H is too large, it will encroach on the internal space of the battery device 10.

[0168] Furthermore, the distance H between the surface of the buffer member 130 facing the first wall 111 and the surface of the buffer member 130 facing the second wall 222 is in the range of 4mm ≤ H ≤ 8mm. When H is within this range, the buffer member 130 can better reduce the risk of insufficient venting space, meet the venting height requirements of the pressure relief mechanism 24, and make better use of the internal space of the battery device 10.

[0169] In some embodiments, H may also be other values. For example, H may be any one of the following values ​​or between any two of the following values: 10mm, 9mm, 8mm, 7.5mm, 7mm, 6.5mm, 6mm, 5.5mm, 5mm, 4.5mm, and 4mm.

[0170] According to some embodiments of this application, this application also provides an electrical device including a battery device of any of the above schemes, and the battery device is used to provide electrical energy to the electrical device.

[0171] The electrical device can be any of the aforementioned devices or systems that utilize battery devices.

[0172] Based on some embodiments of this application, and in conjunction with thereof Figure 2 , Figure 9 , Figure 15 and Figure 16 The battery device 10 has a top cover as a first wall 111, and the battery cell 20 has an end cap 22 as a second wall 222. A protrusion 26 is provided between the two electrode terminals 23 of the battery cell 20. A pressure relief mechanism 24 is provided on the protrusion 26 to make better use of the internal space of the battery device 10. A buffer member 130 is at least partially provided on the surface of the protrusion 26 facing the first wall 111 to be fixed to the upper surface of the protrusion 26. The buffer member 130 includes a first buffer portion 131 and a third buffer portion 133, thereby better providing a buffering effect on both sides of the pressure relief mechanism 24. There is a groove between the protrusions 26 of adjacent battery cells 20. The first buffer portion 131 and the third buffer portion 133 extend into the groove. The orthographic projection of the portion in the groove along the first direction Z is located within the range of the orthographic projection of the portion provided outside the groove along the first direction Z, thereby facilitating processing. The first heat insulation portion 150 covers the surfaces of the first buffer portion 131 and the third buffer portion 133 facing the pressure relief mechanism 24, and further includes a second heat insulation portion 151, which covers at least a portion of the surfaces of the first buffer portion 131 and the third buffer portion 133 facing the first wall 111, thereby protecting the first buffer portion 131 and the third buffer portion 133 in the event of thermal runaway.

[0173] 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, The battery device includes: The housing (11) includes a first wall (111); Multiple battery cells (20) are housed in the housing (11). Each battery cell (20) includes a second wall (222) which is disposed opposite to the first wall (111). The first wall (111) is provided with a pressure relief mechanism (24) and at least two electrode terminals (23). A buffer component (130) is disposed on the second wall (222), and the orthographic projection of the buffer component (130) along the first direction is located between the orthographic projections of the at least two electrode terminals (23) along the first direction, and is located outside the orthographic projection of the pressure relief mechanism (24) along the first direction. Wherein, the first direction is the thickness direction of the second wall (222), and the buffer member (130) is configured to be elastically deformable along the first direction.

2. The battery device according to claim 1, characterized in that, The plurality of battery cells (20) are arranged along a second direction, and the buffer member (130) includes a first buffer portion (131) that extends along the second direction. The orthographic projection of the first buffer portion (131) along the first direction is located between the orthographic projection of the first electrode terminal (23a) of the plurality of battery cells (20) along the first direction and the orthographic projection of the pressure relief mechanism (24) along the first direction, wherein the second direction and the first direction are perpendicular to each other.

3. The battery device according to claim 1 or 2, characterized in that, The buffer component (130) includes a second buffer portion (132), the orthographic projection of the second buffer portion (132) along the first direction being located between the orthographic projections of the adjacent pressure relief mechanism (24) along the first direction.

4. The battery device according to claim 2 or 3, characterized in that, The plurality of battery cells (20) are arranged along a second direction, and the buffer member (130) further includes a third buffer portion (133) extending along the second direction, and the orthographic projection of the third buffer portion (133) along the first direction is located between the orthographic projection of the second electrode terminal (23b) of the battery cell (20) along the first direction and the orthographic projection of the pressure relief mechanism (24) along the first direction, wherein the second direction and the first direction are perpendicular to each other.

5. The battery device according to any one of claims 1 to 4, characterized in that, The elastic modulus x of the buffer component (130) is in the range of 1 kPa ≤ x ≤ 5 GPa.

6. The battery device according to any one of claims 1 to 4, characterized in that, The buffer component (130) includes a multi-layer structure arranged along the first direction, wherein the elastic modulus x of at least one layer of the multi-layer structure is in the range of 1 kPa ≤ x ≤ 5 GPa.

7. The battery device according to claim 6, characterized in that, At least one layer of the multilayer structure includes an insulating layer.

8. The battery device according to any one of claims 1 to 7, characterized in that, The second wall (222) includes a protrusion (26) that protrudes toward the first wall (111) and is located between the at least two electrode terminals (23); The buffer member (130) is at least partially disposed on the surface of the protrusion (26) facing the first wall (111).

9. The battery device according to claim 8, characterized in that, A groove is formed between the protrusions (26) of adjacent battery cells (20), and the buffer member (130) is at least partially disposed in the groove.

10. The battery device according to claim 9, characterized in that, The orthographic projection of the portion of the buffer member (130) disposed in the groove along the first direction is within the range of the orthographic projection of the portion of the buffer member (130) disposed outside the groove along the first direction.

11. The battery device according to any one of claims 1 to 10, characterized in that, The battery device also includes: A first heat insulation part (150) covers the surface of the buffer member (130) facing the pressure relief mechanism (24). The first heat insulation part (150) is an insulating structure.

12. The battery device according to claim 11, characterized in that, The battery device further includes a second heat insulation part (151), which is connected to the first heat insulation part (150) and at least partially covers the surface of the buffer member (130) facing the first wall (111).

13. The battery device according to any one of claims 1 to 12, characterized in that, The distance d between the orthographic projection of the buffer component (130) along the first direction and the orthographic projection of the pressure relief mechanism (24) along the first direction is ≤20mm.

14. The battery device according to any one of claims 1 to 13, characterized in that, The distance H between the surface of the buffer component (130) facing the first wall (111) and the surface of the buffer component (130) facing the second wall (222) is in the range of 2mm≤H≤10mm.

15. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1 to 14, the battery device being used to provide electrical energy.

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