Battery monomer, battery pack and power utilization device

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery, a battery pack and a power utilization device.The single battery comprises an electrode assembly, a shell and a supporting piece, the interior of the shell is hollow to form a containing cavity, the containing cavity is used for containing the electrode assembly, and the shell comprises a pressure relief assembly; the pressure relief assembly is configured to relieve pressure when the interior of the containing cavity reaches set pressure, the supporting piece is arranged in the containing cavity, the supporting piece is of a honeycomb structure and used for supporting the electrode assembly, the supporting piece comprises a channel communicated with the containing cavity, at least part of the channel extends towards the pressure relief assembly, and honeycomb holes of the honeycomb structure form the channel. Therefore, the supporting piece can support the electrode assembly and also can define a directional exhaust path in the shell of the battery monomer, so that the problem that the existing battery monomer cannot realize directional pressure relief is solved, the exhaust capacity of the battery monomer is improved, and the structural stability of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery pack and a power utilization device. BACKGROUND

[0002] In the prior art, in order to improve the use safety of the battery monomer, various structural designs are usually applied to the outside of the battery monomer to give the battery monomer a channel for directional exhaust, but the needs of the battery monomer itself for the directional exhaust path are ignored, which affects the use safety of the battery monomer.

[0003] Meanwhile, the shell of the existing battery monomer cannot effectively support the electrode assembly inside, so that the electrode assembly has a high risk of deformation under certain vibration conditions, which affects the working performance of the battery monomer. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery monomer, a battery pack and a power utilization device, which can not only define a directional exhaust path in the shell of the battery monomer, but also effectively support the electrode assembly, so as to improve the use safety and structural stability of the battery monomer, and solve the technical problems of the lack of a directional exhaust path in the battery monomer itself and poor stability of the electrode assembly in the prior art.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, which comprises: an electrode assembly; a shell, which is internally hollow to form an accommodation cavity, the accommodation cavity being used to accommodate the electrode assembly, the shell comprising a pressure relief assembly, the pressure relief assembly being configured to relieve pressure when the accommodation cavity reaches a set pressure; and a support, which is arranged in the accommodation cavity, the support being formed as a honeycomb structure, the support being used to support the electrode assembly, the support comprising a channel that communicates with the accommodation cavity, at least part of the channel extending towards the pressure relief assembly, and the honeycomb holes of the honeycomb structure being formed as the channel.

[0006] In the technical scheme, the electrode assembly is supported by the support member formed as a honeycomb structure, thereby enhancing the support effect on the electrode assembly, improving the position stability of the electrode assembly, and improving the structural stability of the battery monomer to avoid deformation of the battery monomer under certain vibration conditions, thereby ensuring the working performance of the battery monomer. Meanwhile, the passage is arranged on the support member to communicate with the accommodating cavity, so that the support member can not only support the electrode assembly but also define a directional exhaust path in the shell of the battery monomer, thereby solving the problem that the existing battery monomer cannot be directionally depressurized, improving the exhaust capacity of the battery monomer, and improving the use safety of the battery monomer. In addition, the honeycomb hole of the honeycomb structure is formed as a passage, thereby reducing the forming difficulty of the passage. That is, the support member formed as a honeycomb structure is arranged in the accommodating cavity of the shell, which can not only support the electrode assembly but also define a directional exhaust path in the shell of the battery monomer, thereby improving the use safety of the battery monomer and improving the structural stability of the battery monomer.

[0007] In some embodiments, the pressure relief assembly is arranged on the bottom wall of the shell, and the support member is arranged at the bottom of the accommodating cavity, and at least part of the support member is arranged opposite to the pressure relief assembly.

[0008] In the technical scheme, not only can the electrode assembly be supported by the support member, but also a large amount of gas in the accommodating cavity can flow to the pressure relief assembly through the support member, thereby defining a directional exhaust path in the shell.

[0009] In some embodiments, a receiving groove is arranged on the side of the support member facing the pressure relief assembly, and the receiving groove communicates with the passage and is arranged opposite to the pressure relief assembly.

[0010] In the technical scheme, the gas in the passage can be gathered in the area close to the pressure relief assembly by the receiving groove, so that the pressure relief assembly can be effectively damaged to release the internal pressure of the battery monomer more quickly when the battery monomer is in thermal runaway, thereby reducing the explosion risk of the battery monomer and improving the use safety of the battery monomer. Meanwhile, the high-temperature gas generated in thermal runaway can be concentrated in the area close to the pressure relief assembly, thereby avoiding heat diffusion to the entire battery monomer and facilitating delay of heat spread.

[0011] In some embodiments, at least part of the side of the support member facing the pressure relief assembly is recessed in a direction away from the pressure relief assembly to form the receiving groove.

[0012] In the technical scheme, the forming difficulty of the receiving groove is reduced, and the receiving groove can be arranged opposite to the pressure relief assembly, so that the pressure relief assembly can be broken by the gas when a sufficient amount of gas is gathered in the receiving groove, thereby facilitating exhaust.

[0013] In some embodiments, the plurality of channels are arranged in a plurality of rows and are in communication with each other.

[0014] In the above technical solution, the plurality of channels are cooperated to facilitate forming sufficient exhaust paths and exhaust spaces in the shell of the battery monomer, which is conducive to the gas gathering along the plurality of paths towards the pressure relief assembly, so that the gas in the shell can be effectively exhausted, avoiding the gas gathering in the shell, and further improving the use safety of the battery monomer.

[0015] In some embodiments, a support plate is arranged between two adjacent channels, a portion of the support plate is in abutting cooperation with the bottom wall of the shell, and another portion of the support plate is arranged in spaced manner with the bottom wall of the shell to form a first communication channel between the support plate and the bottom wall of the shell, and the first communication channel communicates the two adjacent channels.

[0016] In the above technical solution, the plurality of channels can be in communication with each other, so that the gas in the shell can flow to the pressure relief assembly through the plurality of channels, and finally realize effective directional pressure relief.

[0017] In some embodiments, a second communication channel extending in a first direction is formed between the support and the bottom wall of the shell, the second communication channel communicates a part of the channels and the pressure relief assembly, and the first communication channel communicates the second communication channel.

[0018] In the above technical solution, since the second communication channel extends in the first direction, the flow capacity of the gas in the shell in the first direction can be improved by using the second communication channel, so that the gas in the plurality of channels can flow to the second communication channel and gather along the second communication channel towards the pressure relief assembly, and finally realize effective directional pressure relief.

[0019] In some embodiments, the channels extend in a second direction, and the second direction intersects the first direction.

[0020] In the above technical solution, by arranging the channels to extend in the second direction, the channels can not only communicate with the accommodating cavities, but also extend towards the pressure relief assembly, so as to facilitate defining a directional exhaust path extending towards the pressure relief assembly in the shell of the battery monomer, and improving the exhaust capacity of the battery monomer.

[0021] In some embodiments, at least part of the support is recessed in a direction away from the bottom wall to form the second communication channel.

[0022] In the above technical solution, the forming difficulty of the second communication channel can be reduced, so as to facilitate improving the flow capacity of the gas in the shell in the first direction by using the second communication channel, and realizing effective directional pressure relief.

[0023] In some embodiments, the plurality of channels includes a first channel and a second channel, and a cross-sectional area of the second channel is greater than a cross-sectional area of the first channel.

[0024] In the above technical solution, the exhaust capacity of the support member is enhanced, and the use safety of the battery cell is improved.

[0025] In some embodiments, at least part of the peripheral wall of the support member is recessed towards the inside of the support member to form the second channel.

[0026] In the above technical solution, not only the exhaust capacity of the support member is increased, but also the support performance of the support member is not excessively reduced due to the arrangement of the second channel, so that the support member has sufficient support force and strong exhaust capacity.

[0027] In some embodiments, the support member includes a first support member and a second support member arranged in sequence, the first support member and the second support member are both provided with the channel, at least part of the second support member is arranged opposite to the pressure relief assembly, and a cross-sectional area of the channel located on the first support member is smaller than a cross-sectional area of the channel located on the second support member.

[0028] In the above technical solution, the channel located on the first support member is arranged in a capillary structure, so that the channel located on the first support member has a function of promoting the electrolyte on the support member to flow towards the electrode assembly, thereby improving the utilization rate of the electrolyte, keeping the electrode assembly wet, and improving the working performance of the battery cell.

[0029] In some embodiments, a maximum width of the channel located on the first support member ranges from 5nm to 100nm; and / or, a maximum width of the channel located on the second support member ranges from 1mm to 10mm.

[0030] In the above technical solution, the cross-sectional area of the channel located on the first support member is smaller than the cross-sectional area of the channel located on the second support member, so that the channel located on the first support member can be arranged in a capillary structure to promote the electrolyte on the support member to flow towards the electrode assembly and improve the utilization rate of the electrolyte.

[0031] In some embodiments, a projection area of the support member on the bottom wall of the shell is S1, a projection area of the first support member on the bottom wall of the shell is S2, and a projection area of the second support member on the bottom wall of the shell is S3, wherein: S2=0.3S1~0.7S1; and / or, S3=0.3S1~0.7S1.

[0032] In the technical solution, the first support and the second support have certain volumes, so that the channels can be arranged on the first support and the second support, and the support and the exhaust capacity of the support are ensured.

[0033] In some embodiments, a projection area of the first support on the bottom wall of the shell is S2, a sum of cross-sectional areas of the channels on the first support is S4, and S4>0.5S2; and / or, a projection area of the second support on the bottom wall of the shell is S3, a sum of cross-sectional areas of the channels on the second support is S5, and S5>0.9S3.

[0034] In the technical solution, the exhaust capacity of the first support and the second support is ensured, and the channels on the first support are arranged in a capillary structure, so that the support has not only the exhaust function but also the function of promoting the flow of the electrolyte to the electrode assembly.

[0035] In some embodiments, the pressure relief assembly is arranged close to the middle of the bottom wall of the shell.

[0036] In the technical solution, compared with arranging the pressure relief assembly close to the end of the bottom wall of the shell, the gas at the end of the shell can flow to the pressure relief assembly in the shortest path, so that the gas in the accommodation cavity can be exhausted in the shortest time, and the use safety of the battery monomer is improved.

[0037] In some embodiments, the support is fixedly connected with the shell.

[0038] In the technical solution, the shell is used to support the support, the position stability of the support is improved, and the support and the exhaust capacity of the support are improved.

[0039] In some embodiments, the peripheral wall of the support is arranged in a spaced manner with the shell.

[0040] In the technical solution, the exhaust space is formed between the peripheral wall of the support and the shell, and the exhaust space is beneficial to enhancing the exhaust capacity of the shell and further improving the use safety of the battery monomer.

[0041] In a second aspect, the embodiments of the present application provide a battery pack, which comprises a plurality of the battery monomers.

[0042] In the technical solution, by using the battery monomer, the use safety of the battery pack is improved while the working performance of the battery pack is ensured.

[0043] In a third aspect, the embodiments of the present application provide a power consumption device, which comprises the battery pack, and the battery pack is used to provide electric energy for the power consumption device.

[0044] In the technical solution described above, the battery pack is used to ensure the working performance of the electrical device and improve the safety of the electrical device.

[0045] Additional aspects and advantages of the present application will become apparent from the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0047] Figure 1 A schematic view of an electrical device according to some embodiments of the present application;

[0048] Figure 2 An exploded view of a battery pack according to some embodiments of the present application;

[0049] Figure 3 An exploded view of a battery cell according to some embodiments of the present application;

[0050] Figure 4 A schematic view of a housing according to some embodiments of the present application;

[0051] Figure 5 A schematic view of a housing and a support in cooperation according to some embodiments of the present application;

[0052] Figure 6 A schematic view of a support according to some embodiments of the first aspect of the present application;

[0053] Figure 7 A sectional view of a support according to some embodiments of the first aspect of the present application;

[0054] Figure 8 A schematic view of a support according to some embodiments of the second aspect of the present application;

[0055] Figure 9 A schematic view of a support according to some embodiments of the third aspect of the present application;

[0056] Figure 10 A schematic view of a support according to some embodiments of the fourth aspect of the present application.

[0057] Reference Signs:

[0058] 2000, an electrical device;

[0059] 1100, battery pack;

[0060] 1000, battery cell;

[0061] 100, housing;

[0062] 110, main body portion; 111, accommodation cavity;

[0063] 300, pressure relief assembly;

[0064] 120, support member;

[0065] 121, passage; 1211, first passage; 1212, second passage;

[0066] 122, first support member; 123, second support member; 124, support plate;

[0067] 140, second communication passage;

[0068] 200, electrode assembly;

[0069] 1110, box; 1111, upper box; 1112, lower box;

[0070] 1200, controller;

[0071] 1300, motor. DETAILED DESCRIPTION

[0072] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0073] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0074] Reference within this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" means any of the

[0075] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0076] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0077] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the application.

[0078] "Multiple" appearing in this application means two or more, including two.

[0079] At present, from the development of market situation, the application of battery monomer is more and more widely. The battery monomer is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields.

[0080] With the continuous expansion of the application field of battery monomer, the market demand is also increasing.

[0081] The battery cell can be a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, and the embodiments of the present application are not limited in this regard. Meanwhile, the battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application are not limited in this regard. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application are not limited in this regard.

[0082] The battery cell generally includes a shell, an electrode assembly, and an electrolyte. The shell is used to accommodate the electrode assembly and the electrolyte, and the shell is provided with at least one positive pole and at least one negative pole. The electrode assembly includes one or more electrode assemblies formed by stacking or winding positive pole tabs, negative pole tabs, and separator films.

[0083] The positive pole tab generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector, and a plurality of positive pole tabs are stacked together and electrically connected to the positive pole. The plurality of positive pole tabs stacked together can be directly welded to the positive pole to form an electrical connection. Alternatively, the battery cell can further include a positive adapter plate. The plurality of positive pole tabs stacked together are welded to one end of the positive adapter plate, and the other end of the positive adapter plate is welded to the positive pole, so that the positive pole tabs are electrically connected to the positive pole.

[0084] The negative pole tab generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector, and a plurality of negative pole tabs are stacked together and electrically connected to the negative pole. The plurality of negative pole tabs stacked together can be directly welded to the negative pole to form an electrical connection. Alternatively, the battery cell can further include a negative adapter plate. The plurality of negative pole tabs stacked together are welded to one end of the negative adapter plate, and the other end of the negative adapter plate is welded to the negative pole, so that the negative pole tabs are electrically connected to the negative pole.

[0085] The material of the separator film is not limited, for example, it can be polypropylene or polyethylene, etc.

[0086] In order to improve the safety of the battery cell, the prior art generally provides a directional exhaust structure on the outside of the battery cell, so that the pressure relief assembly on the battery cell can effectively perform directional exhaust when it fails, thereby reducing the risk of thermal runaway diffusion of the battery cell and improving the safety of the battery cell.

[0087] However, the applicant found that the existing technology neglects the need for directional venting paths in the battery cells themselves, which makes it impossible for the existing technology to significantly improve the safety of the battery cells. Furthermore, as the electrode components become larger, the supporting capacity of the existing battery cell shell is difficult to play a practical role in the battery cells, resulting in a greater risk of deformation of the battery cells under certain vibration conditions, which affects the working performance of the battery cells.

[0088] To solve the above problems, combined with Figures 3-10 As shown, this application embodiment provides a battery cell 1000, which includes a support member 120, a housing 100, and an electrode assembly 200. The support member 120 provides support for the electrode assembly 200, thereby enhancing the support effect on the electrode assembly 200, improving the positional stability of the electrode assembly 200, and thus improving the structural stability of the battery cell 1000. This prevents the battery cell 1000 from deforming under certain vibration conditions, thereby ensuring the working performance of the battery cell 1000. At the same time, a channel 121 communicating with the receiving cavity 111 is provided on the support member 120, and at least a portion of the channel 121 is configured to extend toward the pressure relief assembly 300, thereby defining a directional venting path within the housing 100 of the battery cell 1000. This solves the problem that existing battery cells cannot directionally vent, thereby improving the venting capacity of the battery cell 1000 and enhancing the safety of the battery cell 1000 in use.

[0089] In other words, the support member 120 of the battery cell 1000 of this application can not only support the electrode assembly 200, but also define a directional exhaust path inside the battery cell 1000 itself. This not only improves the safety of the battery cell 1000, but also enhances the structural stability of the battery cell 1000, thereby ensuring the working performance of the battery cell 1000.

[0090] This application embodiment also provides a battery pack 1100 including the above-mentioned battery cell 1000, such as Figure 2 As shown, battery pack 1100 refers to a single physical module comprising multiple battery cells 1000 to provide higher voltage and capacity. For example, battery pack 1100 mentioned in this application may include one or more battery packs for providing voltage and capacity. The battery pack may include multiple battery cells 1000, which are connected in series, parallel, or mixed connections via busbars.

[0091] In some embodiments, the battery pack is typically formed by arranging multiple battery cells 1000. As an example, the battery pack can be a battery module, which is formed by arranging and fixing multiple battery cells 1000 together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells 1000 together with cable ties.

[0092] In some embodiments, as shown in Figure 2 The battery pack 1100 generally includes a box 1110 for packaging one or more battery packs, which can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomer 1000 to some extent; of course, in other embodiments, the battery pack 1100 can also not include the box 1110.

[0093] In some embodiments, as shown in Figure 2 The battery monomer 1000 is arranged in the box 1110. The box 1110 supports and protects the battery monomer 1000, improves the structural stability of the battery monomer 1000, prolongs the service life of the battery monomer 1000, and improves the safety of the battery monomer 1000.

[0094] The box 1110 can have various structures.

[0095] In some embodiments, as shown in Figure 2 The box 1110 can include an upper box 1111 and a lower box 1112, the upper box 1111 and the lower box 1112 are overlapped with each other, and the upper box 1111 and the lower box 1112 jointly define a cavity for accommodating the battery monomer 1000, so as to reduce the molding difficulty of the box 1110, thereby facilitating the arrangement of the battery monomer 1000 in the box 1110.

[0096] The upper box 1111 can be a hollow structure with one end open, and the lower box 1112 can be a plate structure, which is overlapped with the open side of the upper box 1111 (not shown in the example figure) to jointly define the cavity with the upper box 1111; or the lower box 1112 can be a hollow structure with one end open, and the upper box 1111 can be a plate structure (not shown in the example figure), which is overlapped with the open side of the lower box 1112, so that the upper box 1111 and the lower box 1112 can also jointly define the cavity; or, as shown in Figure 2 The upper box 1111 and the lower box 1112 are both hollow structures with one side open, and the open side of the upper box 1111 is overlapped with the open side of the lower box 1112 to define the cavity.

[0097] It should be noted that the box 1110 formed by the upper box 1111 and the lower box 1112 can have various shapes, such as a cylinder, a square or a rectangular, etc.; the battery monomer 1000 can have various shapes, such as a cylinder, a square, etc.

[0098] As shown in Figure 1As shown, the embodiments of the present application also provide a power consuming device 2000 comprising the battery pack 1100 described above, which is used to store or provide electric energy so as to provide electric energy to the power consuming device 2000 and ensure the working performance of the power consuming device 2000 to a certain extent.

[0099] Here, the power consuming device 2000 can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like.

[0100] The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric aircraft toy, and the like; the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like; and the electric tool can include a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like.

[0101] The following embodiments take the power consuming device 2000 as a vehicle for example to introduce the structure of the power consuming device 2000 of the present application in detail.

[0102] Please refer to Figure 1 , Figure 1 The power consuming device 2000 is shown as a vehicle. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, and the like. The vehicle is provided with the battery pack 1100, which can be arranged at the bottom, the head, or the tail of the vehicle. The battery pack 1100 can be used for power supply of the vehicle, for example, the battery pack 1100 can be used as an operating power source of the vehicle.

[0103] In some embodiments, as Figure 1 shown, the vehicle can further include a controller 1200 and a motor 1300, and the controller 1200 is used to control the battery pack 1100 to supply power to the motor 1300, for example, to meet the working power demand of the vehicle during starting, navigation, and driving.

[0104] In some embodiments of the present application, the battery pack 1100 can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0105] The battery cell 1000 according to the embodiments of the present application is described below with reference to the accompanying drawings of the specification.

[0106] In combination with Figure 3 , Figure 4 and Figure 5As shown, the battery cell 1000 includes an electrode assembly 200, a housing 100, and a support 120.

[0107] The electrode assembly 200 is used to store or release electrical energy to meet the power requirements of external devices and enable them to operate normally.

[0108] Combination Figure 3 and Figure 4 As shown, the housing 100 has a hollow interior forming a receiving cavity 111 for accommodating the electrode assembly 200. The housing 100 includes a pressure relief assembly 300, which is configured to release pressure when a set pressure is reached inside the receiving cavity 111.

[0109] The above can also be understood as follows: by hollowing out the interior of the outer casing 100 and forming a receiving cavity 111, the electrode assembly 200 is disposed inside the outer casing 100. While forming the battery cell 1000, the outer casing 100 can also protect the electrode assembly 200 and extend the service life of the electrode assembly 200.

[0110] Meanwhile, by configuring the housing 100 to include a pressure relief component 300, and configuring the pressure relief component 300 to release pressure when the internal pressure of the receiving cavity 111 reaches a set pressure, the gas in the receiving cavity 111 can be released through the pressure relief component 300 after the internal pressure of the housing 100 reaches a set pressure, so as to avoid the internal pressure of the housing 100 from exceeding the set pressure, thereby preventing the battery cell 1000 from exploding due to excessive internal pressure and improving the safety of the battery cell 1000 in use.

[0111] In a specific example, the pressure relief assembly 300 is formed as an explosion-proof valve.

[0112] In some embodiments, such as Figure 4 As shown, the outer casing 100 includes a main body 110 and a pressure relief assembly 300. The main body 110 has a hollow interior forming a receiving cavity 111, and the pressure relief assembly 300 is disposed on the main body 110.

[0113] Combination Figure 3 , Figure 5 and Figure 6 As shown, the support member 120 is disposed in the receiving cavity 111. The support member 120 is used to support the electrode assembly 200. The support member 120 includes a channel 121 communicating with the receiving cavity 111. At least a portion of the channel 121 extends toward the pressure relief assembly 300.

[0114] That is, instead of directly supporting the electrode assembly 200 by the shell 100, the support 120 is arranged in the shell 100, and the electrode assembly 200 is supported by the support 120, so that the supporting effect of the electrode assembly 200 is improved, the position stability of the electrode assembly 200 is improved, the structural stability of the battery monomer 1000 is improved, the deformation of the battery monomer 1000 under some vibration conditions is avoided, and the working performance of the battery monomer 1000 is ensured.

[0115] Notably, the support 120 is further provided with the passage 121 communicating with the containing cavity 111, and at least part of the passage 121 is arranged to extend towards the pressure relief assembly 300, so as to define a directional exhaust path in the shell 100 of the battery monomer 1000 by the support 120, solve the problem that the existing battery monomer cannot be directionally relieved, improve the exhaust capacity of the battery monomer 1000, and improve the use safety of the battery monomer 1000.

[0116] It can be understood that, compared with the prior art, the support 120 is arranged in the shell 100, and the passage 121 communicating with the containing cavity 111 is arranged on the support 120, and at least part of the passage 121 is arranged to extend towards the pressure relief assembly 300, so that the support 120 can not only be used to support the electrode assembly 200, but also can define a directional exhaust path in the shell 100, improve the use safety of the battery monomer 1000, and improve the structural stability of the battery monomer 1000, thereby ensuring the working performance of the battery monomer 1000.

[0117] Through the above arrangement, when gas is generated inside the shell 100, the gas in the containing cavity 111 can flow to the pressure relief assembly 300 through the passage 121, and when a large amount of gas is generated in the containing cavity 111, causing the internal pressure of the shell 100 to reach a set pressure, the gas pressure can break the pressure relief assembly 300, causing the pressure relief assembly 300 to break to communicate with the containing cavity 111, thereby facilitating the exhaust of the gas in the containing cavity 111, avoiding the explosion of the battery monomer 1000 due to excessive internal pressure, and improving the use safety of the battery monomer 1000.

[0118] In some embodiments, the support 120 is made of aluminum material, so that the support 120 itself has a certain structural strength, thereby facilitating the improvement of the supporting performance of the support 120.

[0119] At the same time, because aluminum is light in weight and high in melting point, by arranging the support 120 to be made of aluminum material, the design requirement of light weight of the battery monomer 1000 can be met, and the deformation or expansion of the support 120 due to thermal runaway of the battery monomer 1000 can be avoided.

[0120] Of course, in other embodiments, the support 120 can also be made of other materials with high structural strength, light weight, and high melting point, without specific limitations here.

[0121] In some embodiments, the shell 100 and the support 120 are respectively manufactured separately. The forming difficulty of the shell 100 and the support 120 can be reduced to some extent, thereby reducing the processing difficulty of the battery monomer 1000.

[0122] In some embodiments, in combination with Figure 4 and Figure 5 As shown in the figures, the pressure relief assembly 300 is arranged on the bottom wall of the shell 100, and the support 120 is arranged at the bottom of the accommodating cavity 111. At least part of the support 120 is arranged opposite to the pressure relief assembly 300. By arranging the pressure relief assembly 300 on the bottom wall of the shell 100, the battery monomer 1000 can be formed in a bottom-spraying exhaust form. Compared with exhausting through the top of the battery monomer 1000, when the battery monomer 1000 is applied to a vehicle, the gas exhausted by the battery monomer 1000 can be downwardly exhausted to the bottom of the vehicle, thereby reducing the influence on the people in the vehicle.

[0123] At the same time, by arranging the support 120 at the bottom of the accommodating cavity 111, on the one hand, the support 120 can be arranged close to the pressure relief assembly 300, thereby facilitating the communication of the channel 121 on the support 120 with the pressure relief assembly 300. On the other hand, the support 120 can also be arranged at the bottom of the electrode assembly 200, thereby facilitating the support of the electrode assembly 200 by the support 120 to improve the positional stability of the electrode assembly 200.

[0124] In addition, by arranging at least part of the support 120 opposite to the pressure relief assembly 300, a large amount of gas generated in the accommodating cavity 111 can flow to the pressure relief assembly 300 through the support 120, thereby defining a directional exhaust path inside the shell 100.

[0125] Specifically, the large amount of gas generated in the accommodating cavity 111 flows to the pressure relief assembly 300 through the support 120. When the gas reaches a set pressure, the gas pressure can break the pressure relief assembly 300, so that the pressure relief assembly 300 is damaged to communicate the accommodating cavity 111. At this time, the pressure relief assembly 300 is relieved, thereby avoiding the explosion of the battery monomer 1000 due to excessive internal pressure, and improving the use safety of the battery monomer 1000.

[0126] In some embodiments, the support 120 is provided with a containing groove (not shown in the figure) on the side facing the pressure relief assembly 300, the containing groove is communicated with the channel 121 and is arranged opposite to the pressure relief assembly 300. The containing groove can form a gas gathering space at the area close to the pressure relief assembly 300, so as to gather the gas in the channel 121 at the area close to the pressure relief assembly 300, so that when the battery monomer 1000 occurs thermal runaway, the pressure relief assembly 300 can be effectively broken to release the internal pressure of the battery monomer 1000 faster, reduce the risk of explosion of the battery monomer 1000, and improve the use safety of the battery monomer 1000.

[0127] At the same time, the containing groove can also concentrate the high-temperature gas generated during thermal runaway at the area close to the pressure relief assembly 300, avoid heat diffusion to the whole battery monomer 1000, and be beneficial to delay heat spread, further improve the use safety of the battery monomer 1000.

[0128] In some embodiments, at least part of the side of the support 120 facing the pressure relief assembly 300 is recessed in the direction away from the pressure relief assembly 300 to form the containing groove. While reducing the difficulty of forming the containing groove, the containing groove can also be arranged opposite to the pressure relief assembly 300, so that when a sufficient amount of gas is gathered in the containing groove, the gas can be used to break the pressure relief assembly 300, facilitating exhaust.

[0129] In some embodiments, in combination with Figure 5 and Figure 6 As shown, the channel 121 has a plurality of channels 121, and the plurality of channels 121 are arranged in intervals and communicated with each other. The plurality of channels 121 are matched to be beneficial to form sufficient exhaust path and exhaust space in the shell 100 of the battery monomer 1000, which is beneficial to gather the gas along the plurality of paths towards the pressure relief assembly 300, so that the gas in the shell 100 can be effectively exhausted, avoid the gas gathering in the shell 100, and further improve the use safety of the battery monomer 1000.

[0130] Optionally, the plurality of channels 121 are arranged in a first direction. Wherein, the first direction can be understood as the left-right direction as shown in Figure 6 By arranging the plurality of channels 121 in the first direction, the gas in the first direction can be gathered towards the pressure relief assembly 300 through the channel 121, so that the gas in the shell 100 in the first direction can be effectively exhausted, avoiding the gas gathering in the shell 100.

[0131] In other embodiments, the plurality of channels 121 are arranged in a third direction. Wherein, the third direction can be understood as the left-right direction as shown in Figure 6In the front-rear direction shown in the figure, by arranging the plurality of channels 121 in the third direction, the gas in the third direction can be converged to the pressure relief assembly 300 through the channels 121, so that the gas in the third direction of the shell 100 can be effectively discharged, avoiding the accumulation of gas in the shell 100.

[0132] In other embodiments, as shown in Figure 6 , the plurality of channels 121 are arranged in the first direction and the third direction. That is, the plurality of channels 121 are arranged not only in the first direction but also in the third direction, so that the channels 121 are arranged in the first direction and the third direction of the support 120. At this time, the plurality of channels 121 can be used to converge the gas in the first direction and the third direction of the shell 100 to the pressure relief assembly 300, realizing the directional discharge of the gas in the battery monomer 1000.

[0133] In some embodiments, in combination with Figure 4 , Figure 5 and Figure 6 , the support plate 124 is arranged between the two adjacent channels 121, one part of the support plate 124 is in abutting fit with the bottom wall of the shell 100, and the other part of the support plate 124 is arranged spaced apart from the bottom wall of the shell 100, so as to form a first communication channel (not shown in the figure) between the support plate 124 and the bottom wall of the shell 100, and the first communication channel communicates the two adjacent channels 121. By arranging the first communication channel that communicates the two adjacent channels 121, the plurality of channels 121 can be communicated with each other, so that the gas in the shell 100 can flow to the pressure relief assembly 300 through the plurality of channels 121, and finally realize effective directional pressure relief.

[0134] In some embodiments, the bottom of the support plate 124 is arranged opposite to the bottom wall of the shell 100, the two ends of the bottom of the support plate 124 are in abutting fit with the bottom wall of the shell 100, and the middle part of the bottom of the support plate 124 is arranged spaced apart from the bottom wall of the shell 100, so as to form a first communication channel between the support plate 124 and the bottom wall of the shell 100.

[0135] Optionally, the middle part of the bottom of the support plate 124 is recessed towards the direction away from the bottom wall of the shell 100, so that the middle part of the bottom of the support plate 124 can be arranged spaced apart from the bottom wall of the shell 100, thereby facilitating the formation of the first communication channel between the support plate 124 and the bottom wall of the shell 100, and reducing the forming difficulty of the first communication channel.

[0136] It should be noted that by abutting the two ends of the bottom of the support plate 124 with the bottom wall of the shell 100, the bottom wall of the shell 100 can be used to support the support 120, improve the position stability of the support 120, and thus improve the working performance of the support 120.

[0137] In some embodiments, in combination with Figure 6 and Figure 7 As shown in Figs. 12 and 13, the support 120 and the bottom wall of the shell 100 form a second communication passage 140 extending along the first direction, the second communication passage 140 communicating with a portion of the passages 121 and the pressure relief assembly 300, and the first communication passage communicates with the second communication passage 140. Since the two adjacent passages 121 are communicated through the first communication passage, by arranging the first communication passage to communicate with the second communication passage 140, the plurality of passages 121 can all communicate with the second communication passage 140. Since the second communication passage 140 extends along the first direction, the flow capacity of the gas in the shell 100 in the first direction can be improved by using the second communication passage 140, so that the gas in the plurality of passages 121 can all converge along the second communication passage 140 to the pressure relief assembly 300, facilitating effective directional pressure relief and improving the use safety of the battery monomer 1000.

[0138] It should be noted that when the two adjacent passages 121 can directly communicate with the second communication passage 140, the support plate 124 between the two adjacent passages 121 does not need to be recessed in a direction away from the bottom wall of the shell 100 to form the first communication passage, reducing the molding difficulty of the support plate 124, and further reducing the molding difficulty of the support 120, thereby improving the molding efficiency of the support 120.

[0139] In some embodiments, the passages 121 extend along a second direction intersecting the first direction. Here, the second direction can be understood as the up-down direction as shown in Figs. 1 and 2. By arranging the passages 121 to extend along the second direction, the passages 121 can not only communicate with the accommodation cavity 111, but also extend towards the pressure relief assembly 300, thereby facilitating the definition of a directional exhaust path extending towards the pressure relief assembly 300 in the shell 100 of the battery monomer 1000, and improving the exhaust capacity of the battery monomer 1000. Figure 5

[0140] In some embodiments, in combination with Figure 5 , Figure 6 and Figure 7 As shown in Figs. 12 and 13, at least part of the support 120 is recessed in a direction away from the bottom wall to form the second communication passage 140. The molding difficulty of the second communication passage 140 can be reduced, thereby facilitating the use of the second communication passage 140 to improve the flow capacity of the gas in the shell 100 in the first direction, and achieving effective directional pressure relief.

[0141] Of course, in other embodiments, at least part of the bottom wall of the shell 100 can also be arranged to be recessed in a direction away from the support 120, and the second communication passage 140 can also be formed.

[0142] ​It should be noted that the top wall and the bottom wall of the second communication passage 140 can be formed as a plane or as a curved surface, and the present application does not make a specific limitation.

[0143] In a specific example, the side of the support 120 facing the bottom wall can be milled to form the second communication passage 140.

[0144] In some embodiments, as shown in Figure 8 The plurality of passages 121 includes a first passage 1211 and a second passage 1212, and the cross-sectional area of the second passage 1212 is greater than that of the first passage 1211. This is advantageous for increasing the sum of the cross-sectional areas of the plurality of passages 121, thereby enhancing the exhaust capability of the support 120 and improving the use safety of the battery monomer 1000.

[0145] It should be noted that when the passage 121 extends in the second direction, the cross-sectional area of the first passage 1211 can be understood as the area of the cross section presented when the first passage 1211 is "cut across" in the second direction; correspondingly, the cross-sectional area of the second passage 1212 can be understood as the area of the cross section presented when the second passage 1212 is "cut across" in the second direction.

[0146] In some embodiments, as shown in Figure 8 At least part of the peripheral wall of the support 120 is recessed towards the inside of the support 120 to form the second passage 1212. This not only increases the exhaust capability of the support 120, but also avoids excessively reducing the supporting performance of the support 120 due to the arrangement of the second passage 1212, so that the support 120 has sufficient supporting force and the exhaust capability of the support 120 is ensured.

[0147] At the same time, by arranging at least part of the peripheral wall of the support 120 to be recessed towards the inside of the support 120 to form the second passage 1212, it is also advantageous to reduce the forming difficulty of the second passage 1212.

[0148] It should be noted that, Figure 8 It is shown that at least part of the two side walls of the support 120 in the length direction is arranged to be recessed towards the inside of the support 120 to form the second passage 1212. In other embodiments, at least part of the two side walls of the support 120 in the width direction can also be arranged to be recessed towards the inside of the support 120 to form the second passage 1212, or at least part of the two side walls of the support 120 in the length direction and at least part of the two side walls of the support 120 in the width direction are arranged to be recessed towards the inside of the support 120 to form the second passage 1212.

[0149] In some embodiments, in combination with Figure 9 and Figure 10As shown, the support 120 comprises a first support 122 and a second support 123 arranged in sequence, and the first support 122 and the second support 123 are both provided with the passages 121, at least part of the second support 123 is arranged opposite to the pressure relief assembly 300, and the cross-sectional area of the passage 121 on the first support 122 is smaller than that of the passage 121 on the second support 123. By setting the cross-sectional area of the passage 121 on the first support 122 to be smaller than that of the passage 121 on the second support 123, the passage 121 on the first support 122 can be arranged in a capillary structure, so that the first support 122 has a function of promoting the flow of the electrolyte on the support 120 towards the electrode assembly 200, so as to improve the utilization rate of the electrolyte, keep the electrode assembly 200 wet, and improve the working performance of the battery monomer 1000.

[0150] It should be noted that, due to the existence of the redundant space (the support 120) at the bottom of the shell 100, the electrolyte will accumulate at the bottom of the shell 100 during normal use of the electrode assembly 200, resulting in waste of the electrolyte. By using the passages 121 with different cross-sectional areas in combination, the passage 121 with a smaller cross-sectional area can promote the flow of the electrolyte on the support 120 towards the electrode assembly 200, and in addition, the passage 121 with a larger cross-sectional area can ensure smooth flow of the gas, so as to achieve the purpose of directional exhaust, thereby ensuring the use safety and working performance of the battery monomer 1000.

[0151] That is, by arranging the support 120 to comprise the first support 122 and the second support 123 arranged in sequence, and setting the cross-sectional area of the passage 121 on the first support 122 to be smaller than that of the passage 121 on the second support 123, the support 120 not only has the functions of supporting and exhausting, but also has the function of promoting the flow of the electrolyte towards the electrode assembly 200, so as to improve the working performance of the support 120.

[0152] It should also be noted that the first support 122 and the second support 123 arranged in sequence can be arranged in sequence along the first direction (as shown in Figure 10 , or can be arranged in sequence along the third direction (as shown in Figure 9 , and the present application does not make specific limitations.

[0153] In specific examples, the first support 122 and the second support 123 can be used in combination according to the actual gas production conditions and structural strength requirements of different regions of the battery monomer 1000, so as to not only support the electrode assembly 200 by the support 120, but also effectively guide the gas to flow to the pressure relief assembly 300, thereby improving the use safety of the battery monomer 1000.

[0154] It should be further noted that when the battery monomer 1000 is working normally, the support 120 is usually soaked in the electrolyte, at which time the support 120 can be used to promote the electrolyte to flow towards the electrode assembly 200; when the battery monomer 1000 is in thermal runaway, the electrolyte is gasified in the shell 100 to form a large amount of gas, at which time the channel 121 of the support 120 can be used to guide the gas to flow to the pressure relief assembly 300, so as to facilitate directional pressure relief, thereby improving the use safety of the battery monomer 1000.

[0155] In some embodiments, the maximum width of the channel 121 located on the first support 122 ranges from 5 nm to 100 nm. When the maximum width of the channel 121 located on the first support 122 is too small, the processing difficulty of the channel 121 located on the first support 122 is increased; when the maximum width of the channel 121 located on the first support 122 is too large, it is not conducive to forming a capillary structure of the channel 121 located on the first support 122, so that the support 120 cannot promote the electrolyte to flow towards the electrode assembly 200.

[0156] In summary, the maximum width of the channel 121 located on the first support 122 is set to 5 nm to 100 nm, which not only reduces the processing difficulty of the channel 121 located on the first support 122, but also enables the channel 121 located on the first support 122 to be formed into a capillary structure, so that the channel 121 on the first support 122 can promote the electrolyte to flow towards the electrode assembly 200, improve the utilization rate of the electrolyte, and thus improve the working performance of the battery monomer 1000.

[0157] Specifically, the maximum width of the channel 121 located on the first support 122 is 5 nm, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm or 100 nm, etc.

[0158] In some embodiments, the maximum width of the channel 121 located on the second support 123 ranges from 1 mm to 10 mm. When the maximum width of the channel 121 located on the second support 123 is too small, on the one hand, the processing difficulty of the channel 121 located on the second support 123 is increased, and on the other hand, it is not conducive to using the channel 121 on the second support 123 to discharge the gas; when the maximum width of the channel 121 located on the second support 123 is too large, the structural strength of the second support 123 is reduced, thereby reducing the structural strength of the support 120 and affecting the supporting performance of the support 120.

[0159] In conclusion, the maximum width of the channel 121 on the second support 123 is set to 1mm-10mm, which can reduce the processing difficulty of the channel 121 on the second support 123, effectively guide the gas flow, ensure the structural strength of the second support 123, ensure the structural strength of the support 120, and facilitate the stable support of the electrode assembly 200 by the support 120, and ensure the position stability of the electrode assembly 200.

[0160] Specifically, the maximum width of the channel 121 on the second support 123 is 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc.

[0161] In some embodiments, the projection area of the support 120 on the bottom wall of the shell 100 is S1, the projection area of the first support 122 on the bottom wall of the shell 100 is S2, and the projection area of the second support 123 on the bottom wall of the shell 100 is S3, wherein: S2=0.3S1~0.7S1; and / or, S3=0.3S1~0.7S1. By setting S2=0.3S1~0.7S1, the first support 122 has a certain volume, which can ensure the support performance of the first support 122, facilitate the setting of the channel 121 on the first support 122, and ensure the performance of the first support 122 in promoting the backflow of the electrolyte.

[0162] Specifically, S2 is 0.3S1, 0.4S1, 0.5S1, 0.6S1 or 0.7S1, etc.

[0163] At the same time, by setting S3=0.3S1~0.7S1, the second support 123 has a certain volume, which can ensure the support performance of the second support 123, facilitate the setting of the channel 121 on the second support 123, and ensure the exhaust performance of the second support 123.

[0164] Specifically, S3 is 0.3S1, 0.4S1, 0.5S1, 0.6S1 or 0.7S1, etc.

[0165] It should be noted that when the support 120 includes a plurality of first supports 122 and a plurality of second supports 123, the projection area S2 of the first support 122 on the bottom wall of the shell 100 can be understood as the sum of the projection areas of the plurality of first supports 122 on the bottom wall of the shell 100; at the same time, the projection area S3 of the second support 123 on the bottom wall of the shell 100 can be understood as the sum of the projection areas of the plurality of second supports 123 on the bottom wall of the shell 100.

[0166] In some embodiments, the projected area of ​​the first support member 122 on the bottom wall of the housing 100 is S2, and the sum of the cross-sectional areas of the channels 121 on the first support member 122 is S4, wherein S4 > 0.5S2. This ensures that the sum of the coverage areas of the multiple channels 121 on the first support member 122 is greater than 0.5S2, facilitating the configuration of the channels 121 on the first support member 122 as a capillary structure, so that the channels 121 on the first support member 122 have the function of promoting the flow of electrolyte toward the electrode assembly 200.

[0167] In some embodiments, the projected area of ​​the second support member 123 on the bottom wall of the housing 100 is S3, and the sum of the cross-sectional areas of the channels 121 on the second support member 123 is S5, wherein S5 > 0.9S3. This ensures that the sum of the coverage areas of the multiple channels 121 on the second support member 123 is greater than 0.9S3, facilitating exhaust using the multiple channels 121 on the second support member 123 and improving exhaust performance.

[0168] In some embodiments, such as Figure 4 As shown, the pressure relief assembly 300 is positioned near the middle of the bottom wall of the housing 100. Compared to positioning the pressure relief assembly 300 near the end of the bottom wall of the housing 100, this allows gas located at the end of the housing 100 to flow to the pressure relief assembly 300 via the shortest path, thereby enabling the gas in the receiving cavity 111 to be discharged in the shortest possible time, thus improving the safety of the battery cell 1000.

[0169] It should be noted that the aforementioned pressure relief component 300 being located near the middle of the bottom wall of the housing 100 can be understood as the pressure relief component 300 being located near the middle of the bottom wall of the housing 100 in the first direction and the third direction, so that the gas located at the end of the housing 100 in the first direction and the end of the housing in the third direction can flow to the pressure relief component 300 in the shortest path, so that the gas in the receiving cavity 111 can be discharged in the shortest time.

[0170] In some embodiments, the support member 120 is fixedly connected to the housing 100. This facilitates the use of the housing 100 to support the support member 120, improves the positional stability of the support member 120, and prevents the support member 120 from shaking or shifting within the housing 100, thereby ensuring the exhaust capacity of the support member 120 and enabling the support member 120 to stably support the electrode assembly 200.

[0171] In some embodiments, the housing 100 may be fixedly connected to the support member 120 by means of tenons or buckles.

[0172] Meanwhile, when the housing 100 is internally provided with a protruding rib, a structure for avoiding the protruding rib can be arranged on the support 120 to avoid interference between the support 120 and the housing 100, thereby facilitating arrangement of the support 120 in the housing 100.

[0173] Optionally, the protruding rib and the structure for avoiding interference are in clearance fit, so as to form more space for gas circulation and improve the exhaust capacity of the support 120.

[0174] In addition, the position of the support 120 corresponding to the protruding rib can be milled to form the structure for avoiding interference.

[0175] In some embodiments, in combination with Figure 4 and Figure 5 , the peripheral wall of the support 120 is arranged in space with the housing 100. Thus, the peripheral wall of the support 120 can form an exhaust space with the housing 100, which is conducive to improving the exhaust capacity of the housing 100 and further improving the safety of the battery monomer 1000.

[0176] In some embodiments, in combination with Figure 6 , Figure 8 , Figure 9 and Figure 10 , the support 120 is formed as a honeycomb structure, and the honeycomb holes of the honeycomb structure are formed as the channels 121. The porous structure characteristics and the high-strength performance characteristics of the honeycomb structure are utilized to reduce the difficulty of forming the channels 121 and improve the support performance of the support 120, so as to support the electrode assembly 200 by the support 120.

[0177] In summary, the porous structure characteristics and the high-strength performance characteristics of the honeycomb structure are utilized to lay the honeycomb structure on the bottom of the accommodating cavity 111, so as to form a raised design for the electrode assembly 200. The honeycomb structure provides high-strength support, and the porous structure on the honeycomb structure provides sufficient channels 121 for the bottom when the electrode assembly 200 fails. This is conducive to the gas gathering at the bottom of the pressure relief assembly 300 along the channels 121, and finally realizes effective directional pressure relief and improves the exhaust capacity of the battery monomer 1000.

[0178] In a specific example, when the battery monomer 1000 is in thermal runaway, the electrode assembly 200 will deform and produce gas violently. Under the action of the honeycomb structure, the end face of the electrode assembly 200 is effectively lifted up, and the gas flows downward along the channels 121 in the honeycomb structure, realizing more accurate directional pressure relief.

[0179] The battery pack 1100 of the embodiments of the present application will be described below with reference to the accompanying drawings.

[0180] As shown in Figure 2As shown, the battery pack 1100 of this application embodiment includes the battery cell 1000 of the above embodiment.

[0181] Since the battery cell 1000 of this application embodiment has the above-mentioned technical effects, the battery pack 1100 of this application embodiment also has the above-mentioned technical effects. That is, by adopting the battery cell 1000 of this application, while ensuring the working performance of the battery pack 1100, the safety of the battery pack 1100 can also be improved.

[0182] The following description of an embodiment of the electrical device 2000 of this application is based on the accompanying drawings.

[0183] like Figure 1 As shown, the power-consuming device 2000 of this application embodiment includes the battery pack 1100 of the above embodiment, which is used to store or provide electrical energy.

[0184] Since the battery pack 1100 of this application embodiment has the above-mentioned technical effects, the power device 2000 of this application embodiment also has the above-mentioned technical effects. That is, by adopting the battery pack 1100 of this application, while ensuring the working performance of the power device 2000, the safety of the power device 2000 can also be improved.

[0185] It is understood that other components of the battery cell 1000, battery pack 1100 and power device 2000 according to the embodiments of this application (e.g., the specific structure of the controller 1200, motor 1300, etc.) are known to those skilled in the art and will not be described in detail here.

[0186] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0187] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, The electrode assembly (200) comprises: a housing (100) having a receiving cavity (111) formed in the interior of the housing (100) for accommodating the electrode assembly (200), the housing (100) comprising a pressure relief assembly (300) configured to relieve pressure when the pressure in the receiving cavity (111) reaches a set pressure; a support (120) provided in the receiving cavity (111), the support (120) being formed as a honeycomb structure for supporting the electrode assembly (200), the support (120) comprising passages (121) communicating with the receiving cavity (111), at least part of the passages (121) extending towards the pressure relief assembly (300), the honeycomb holes of the honeycomb structure being formed as the passages (121). The pressure relief assembly (300) is provided on the bottom wall of the housing (100), and the support (120) is provided at the bottom of the receiving cavity (111), at least part of the support (120) being arranged opposite to the pressure relief assembly (300).

2. The battery cell of claim 1, wherein, The side of the support (120) facing the pressure relief assembly (300) is provided with a receiving groove, the receiving groove communicating with the passages (121) and being arranged opposite to the pressure relief assembly (300).

3. The battery cell of claim 1, wherein, At least part of the side of the support (120) facing the pressure relief assembly (300) is recessed in a direction away from the pressure relief assembly (300) to form the receiving groove.

4. The battery cell of claim 3, wherein, The passages (121) are provided in plurality, and the plurality of passages (121) are arranged in intervals and communicate with each other.

5. The battery cell of claim 2, wherein, A support plate (124) is provided between adjacent two of the passages (121), one part of the support plate (124) abutting against the bottom wall of the housing (100), and another part of the support plate (124) being arranged in intervals with the bottom wall of the housing (100) to form a first communication passage between the support plate (124) and the bottom wall of the housing (100), the first communication passage communicating adjacent two of the passages (121).

6. The battery cell of claim 5, wherein, A second communication passage (140) extending in a first direction is formed between the support (120) and the bottom wall of the housing (100), the second communication passage (140) communicating part of the passages (121) and the pressure relief assembly (300), and the first communication passage communicating the second communication passage (140).

7. The battery cell of claim 6, wherein, The passages (121) extend in a second direction intersecting the first direction.

8. The battery cell of claim 7, wherein, At least part of the support (120) is recessed in a direction away from the bottom wall to form the second communication passage (140).

9. The battery cell of claim 7, wherein, The plurality of passages (121) comprises first passages (1211) and second passages (1212), the cross-sectional area of the second passages (1212) being greater than that of the first passages (1211).

10. The battery cell of claim 5, wherein, ​ 11. The battery cell of claim 10, wherein, At least part of the circumferential wall of the support (120) is recessed towards the inside of the support (120) to form the second channel (1212).

12. The battery cell of claim 5, wherein, The support (120) comprises a first support (122) and a second support (123) arranged in sequence, the first support (122) and the second support (123) are both provided with the channel (121), at least part of the second support (123) is arranged opposite to the pressure relief assembly (300), and the cross-sectional area of the channel (121) located on the first support (122) is smaller than the cross-sectional area of the channel (121) located on the second support (123).

13. The battery cell of claim 12, wherein, The maximum width of the channel (121) located on the first support (122) ranges from 5nm to 100nm. And / or, the maximum width of the channel (121) located on the second support (123) ranges from 1mm to 10mm.

14. The battery cell of claim 12, wherein, The projection area of the support (120) on the bottom wall of the shell (100) is S1, the projection area of the first support (122) on the bottom wall of the shell (100) is S2, and the projection area of the second support (123) on the bottom wall of the shell (100) is S3, wherein: S2=0.3S1~0.7S1; and / or, S3=0.3S1~0.7S1.

15. The battery cell of claim 12, wherein, The projection area of the first support (122) on the bottom wall of the shell (100) is S2, and the sum of the cross-sectional areas of the channels (121) located on the first support (122) is S4, wherein: S4>0.5S2. And / or, the projection area of the second support (123) on the bottom wall of the shell (100) is S3, and the sum of the cross-sectional areas of the channels (121) located on the second support (123) is S5, wherein: S5>0.9S3.

16. The battery cell of claim 1, wherein, The pressure relief assembly (300) is arranged close to the middle of the bottom wall of the shell (100).

17. The battery cell of claim 1, wherein, The support (120) is fixedly connected with the shell (100).

18. The battery cell of claim 1, wherein, The circumferential wall of the support (120) is arranged in a spaced manner with the shell (100).

19. A battery pack, characterized by A plurality of battery cells according to any one of claims 1-18 are included.

20. An electrical device, comprising: A battery pack according to claim 19 is used to provide electrical energy for the electrical device.

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