Battery monomer, battery, energy storage device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery, an energy storage device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, an electrode terminal, a pressure relief mechanism and a barrier part, the shell is provided with a containing cavity, and the shell comprises a first shell wall; the electrode assembly is at least partially arranged in the accommodating cavity; the electrode terminal is arranged on the first shell wall and is electrically connected with the electrode assembly; the pressure relief mechanism is arranged on the first shell wall; the blocking part is arranged on the first shell wall, at least part of the blocking part protrudes out of the surface, back to the containing cavity, of the first shell wall, and the blocking part is located between the pressure relief mechanism and the electrode terminal. The battery comprises at least one battery monomer. The energy storage device comprises a plurality of the single batteries or the batteries. The power utilization device comprises the single battery or the battery for providing electric energy. The battery monomer, the battery, the energy storage device and the power utilization device provided by the utility model have high volume energy density and low short circuit probability.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to battery cells, batteries, energy storage devices, and power-consuming devices. Background Art

[0002] New energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field, etc. In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the energy storage field, the batteries can be installed in an energy storage box or directly installed on the user side.

[0003] When a battery cell undergoes thermal runaway and pressure relief, the ejecta such as gas or liquid ejected from the pressure relief valve is likely to spread to the terminal post. The terminal post and the outer shell are electrically connected through the ejecta, causing a short circuit and affecting the performance and lifespan of the battery. In addition, the industry constantly puts forward higher requirements for the volumetric energy density of batteries. Summary of the Utility Model

[0004] To solve the above technical problems, this application provides a battery cell, a battery, an energy storage device, and a power-consuming device with high volumetric energy density and low short-circuit probability.

[0005] In a first aspect of this application, a battery cell is provided, including: an outer shell having a receiving cavity, the outer shell including a first shell wall; an electrode assembly, at least partially disposed in the receiving cavity; an electrode terminal disposed on the first shell wall and electrically connected to the electrode assembly; a pressure relief mechanism disposed on the first shell wall; and a barrier portion disposed on the first shell wall, at least a part of the barrier portion protruding from a surface of the first shell wall facing away from the receiving cavity and located between the pressure relief mechanism and the electrode terminal.

[0006] Both the pressure relief mechanism and the electrode terminal are disposed on the first shell wall, reducing the occupation of the space in the receiving cavity, thereby increasing the volumetric energy density of the battery cell. Moreover, a barrier portion is provided between the pressure relief mechanism and the electrode terminal. The barrier portion can block the ejecta discharged from the pressure relief mechanism, reducing the probability of the ejecta spreading to contact the electrode terminal, thereby reducing the risk of short circuit, and further improving the performance of the battery and extending the lifespan of the battery.

[0007] In some embodiments, on a projection plane perpendicular to the arrangement direction of the pressure relief mechanism and the electrode terminal, the positive projection of the electrode terminal entirely falls within the positive projection range of the barrier portion.

[0008] In this way, it can better block the spread of the ejecta towards the electrode terminal, further reducing the probability of the ejecta spreading to contact the electrode terminal, thereby further reducing the risk of short circuit, and further improving the performance of the battery and extending the lifespan of the battery.

[0009] In some embodiments, at least a part of the barrier portion is made of an insulating material.

[0010] The insulating material enables the barrier portion to better play the role of electrical isolation, thereby further reducing the risk of short circuit, and then improving the performance of the battery and extending the life of the battery.

[0011] In some embodiments, the melting point of the material of at least a part of the barrier portion is above 400 °C.

[0012] In this way, it is possible to reduce the influence of the barrier portion 5 melting due to too high temperature of the ejected discharge on the blocking effect of the barrier portion 5 on the discharge, so that the barrier portion can better play the blocking role, thereby reducing the risk of short circuit and improving the performance of the battery and extending the life of the battery.

[0013] In some embodiments, at least a part of the barrier portion is made of a ceramic material or a plastic material.

[0014] The ceramic material or the plastic material is a material with good insulation performance and high melting point, which can not only reduce the probability of melting of the barrier portion, but also better play the role of electrical isolation due to its insulation performance, thereby further reducing the risk of short circuit, and then improving the performance of the battery and extending the life of the battery.

[0015] In some embodiments, the entire barrier portion is disposed on the side of the first housing wall facing away from the accommodation cavity.

[0016] In this way, it can not only play the role of blocking the discharge from spreading to the electrode terminal, but also eliminate the need to provide holes or grooves for installing the barrier portion on the first housing wall, which is beneficial to improving the structural strength of the first housing wall and reducing the probability of the internal electrolyte leaking through the holes or grooves.

[0017] In some embodiments, the barrier portion is welded to the first housing wall.

[0018] The barrier portion is connected to the first housing wall by welding. The welding operation is simple, and it can make the entire barrier portion disposed on the side of the first housing wall facing away from the accommodation cavity, and make the connection between the barrier portion and the first housing wall firm.

[0019] In some embodiments, the first housing wall is provided with a mounting hole, the barrier portion passes through the mounting hole, one end of the barrier portion extends into the accommodation cavity, and the other end extends along the direction away from the accommodation cavity and protrudes from the surface of the first housing wall facing away from the accommodation cavity.

[0020] In this way, a part of the barrier portion is penetrated into the first housing wall, which is beneficial to improving the reliability of the connection between the barrier portion and the first housing wall.

[0021] In some embodiments, the barrier portion is riveted to the first housing wall.

[0022] In this way, the barrier portion is riveted to the first housing wall, and the connection reliability is strong.

[0023] In some embodiments, an insulating member is provided between the first housing wall and the electrode assembly, and the barrier portion is heat-melted to the insulating member.

[0024] One end of the barrier portion extending into the accommodation cavity is connected to the insulating member by heat melting, and the connection strength is high, which is more conducive to exerting the blocking effect of the barrier portion, thereby further reducing the risk of short circuit, and then improving the performance of the battery and extending the service life of the battery.

[0025] In some embodiments, the first housing wall is provided with a liquid injection hole, and the barrier portion is disposed between the liquid injection hole and the electrode terminal.

[0026] The barrier portion is disposed between the liquid injection hole and the electrode terminal. In the case where gas or liquid and other ejecta leak out from the liquid injection hole, the barrier portion can block the ejecta from moving towards the electrode terminal, thereby reducing the probability of the ejecta spreading to contact the electrode terminal, thereby reducing the risk of short circuit, and then improving the performance of the battery and extending the service life of the battery.

[0027] In some embodiments, the liquid injection hole is disposed between the barrier portion and the pressure relief mechanism.

[0028] In this way, not only the barrier portion is located between the liquid injection hole and the electrode terminal, reducing the probability of the ejecta ejected from the liquid injection hole spreading to contact the electrode terminal, but also it is easy to make the pressure relief mechanism far away from the electrode terminal, which is beneficial to reducing the probability of the ejecta ejected from the pressure relief mechanism spreading to contact the electrode terminal, and further reducing the risk of short circuit, improving the performance of the battery and extending the service life of the battery.

[0029] In some embodiments, along the length direction of the first housing wall, the minimum distance between the pressure relief mechanism and the liquid injection hole is not less than 20 mm.

[0030] In this way, the distance between the pressure relief mechanism and the liquid injection hole is large enough to reduce the mutual influence between the pressure relief mechanism and the liquid injection hole to ensure their respective functions.

[0031] In some embodiments, along the length direction of the first housing wall, the minimum distance between the liquid injection hole and the electrode terminal closest to the liquid injection hole is not less than 20 mm.

[0032] In this way, the distance between the liquid injection hole and the electrode terminal is made large enough to reduce the probability that the ejecta ejected from the liquid injection hole spreads to the contact electrode terminal, thereby reducing the risk of short circuit, and further improving the performance of the battery and extending the life of the battery.

[0033] In some embodiments, along the length direction of the first housing wall, the size of the liquid injection hole is in the range of 6 mm to 20 mm.

[0034] In this way, controlling the size of the liquid injection hole along the length direction of the first housing wall within a suitable range can well ensure the liquid injection function of the liquid injection hole and will not occupy too much space on the first housing wall.

[0035] In some embodiments, the minimum distance between the electrode terminal closest to the barrier portion and the barrier portion is not less than 5 mm.

[0036] In this way, by defining the distance between the electrode terminal and the barrier portion, the distance between the electrode terminal and the pressure relief mechanism is made large enough, further reducing the probability that the ejecta spreads to contact the electrode terminal, thereby reducing the risk of short circuit, and further improving the performance of the battery and extending the life of the battery.

[0037] In some embodiments, the minimum distance between the electrode terminal closest to the barrier portion and the barrier portion is in the range of 10 mm to 20 mm.

[0038] In this way, by further defining the distance between the electrode terminal and the barrier portion, the distance between the electrode terminal and the pressure relief mechanism is controlled within a suitable range, better reducing the probability that the ejecta spreads to contact the electrode terminal, thereby further reducing the risk of short circuit, and further improving the performance of the battery and extending the life of the battery.

[0039] In some embodiments, along the length direction of the first housing wall, the distance between the electrode terminal and the edge of the first housing wall is not less than 5 mm.

[0040] In this way, by defining the position of the electrode terminal on the first housing wall, the electrode terminal is suitable for connecting the ear of the electrode assembly, ensuring the normal function of the electrode terminal.

[0041] In some embodiments, along the length direction of the first housing wall, the minimum distance between the pressure relief mechanism and the edge of the first housing wall is not less than 10 mm.

[0042] In this way, by defining the position of the pressure relief mechanism on the first housing wall, the pressure relief mechanism can normally spray the valve during thermal runaway, ensuring the normal function of the pressure relief mechanism.

[0043] In some embodiments, the dimension of the barrier portion protruding from the surface of the first housing wall facing away from the accommodation cavity along the wall thickness direction of the first housing wall is in the range of 4.7 mm to 30 mm.

[0044] In this way, the height of the portion of the barrier portion protruding outside the first housing wall is limited within an appropriate range, so that the barrier portion can play a role in blocking the diffusion of the sprayed material, and at the same time, the barrier portion does not hinder the arrangement of other components in the wall thickness direction of the first housing wall.

[0045] In some embodiments, the dimension of the barrier portion protruding from the surface of the first housing wall facing away from the accommodation cavity along the wall thickness direction of the first housing wall is in the range of 6 mm to 15 mm.

[0046] By further limiting the height of the portion of the barrier portion protruding outside the first housing wall, the barrier portion can better play the role of blocking the diffusion of the sprayed material, and the barrier portion is more unlikely to hinder the arrangement of other components in the wall thickness direction of the first housing wall.

[0047] In some embodiments, the dimension of the barrier portion protruding from the surface of the first housing wall facing away from the accommodation cavity along the wall thickness direction of the first housing wall is not less than the dimension of the electrode terminal protruding from the surface of the first housing wall facing away from the accommodation cavity along the wall thickness direction of the first housing wall.

[0048] In this way, the blocking height of the barrier portion is greater than the exposed height of the electrode terminal, which can more fully block the diffusion of the sprayed material to the electrode terminal, thereby reducing the risk of short circuit, and further improving the performance of the battery and extending the life of the battery.

[0049] In some embodiments, there are at least two electrode terminals, and the barrier portion is disposed between the pressure relief mechanism and each of the electrode terminals.

[0050] There is a barrier portion between any one of the electrode terminals and the pressure relief mechanism, so that the diffusion of the sprayed material ejected from the pressure relief mechanism towards any one of the electrode terminals is blocked by the barrier portion, thereby more comprehensively reducing the risk of short circuit, and further improving the performance of the battery and extending the life of the battery.

[0051] In some embodiments, the electrode terminals are arranged along the length direction of the first housing wall; or, the electrode terminals are arranged along the width direction of the first housing wall.

[0052] The electrode terminals are arranged along the length direction of the first housing wall, which can make the size of the outer shell in the width direction of the first housing wall relatively small, facilitating the electrical connection between the electrode terminals and the tabs of the electrode assembly. The electrode terminals are arranged along the width direction of the first housing wall, which can make the size of the outer shell in the length direction of the first housing wall relatively small, being beneficial to the electrical connection between battery cells.

[0053] In some embodiments, at least two of the electrode terminals include a first electrode terminal and a second electrode terminal. The first electrode terminal includes a first main body portion and a first connection portion connected to the first main body portion. The second electrode terminal includes a second main body portion and a second connection portion connected to the second main body portion. The first main body portion and the second main body portion are arranged along the length direction of the first housing wall, and the projections of the first main body portion and the second main body portion along the length direction at least partially overlap. The first connection portion and the second connection portion are arranged along the width direction of the first housing wall, and the projections of the first connection portion and the second connection portion along the width direction at least partially overlap.

[0054] In the battery cell of the embodiment of the present disclosure, since the first connection portion and the second connection portion are arranged along the width direction of the first housing wall and the projections along the width direction overlap, the first electrode terminal and the second electrode terminal are set in a relatively concentrated position, which helps to jointly bear the external force and reduce the degree of deformation, thereby enhancing the structural strength. Since the first connection portion and the second connection portion are respectively used to connect with the tab, after a plurality of battery cells are arranged along the width direction of the first housing wall, the first connection portion and the second connection portion of adjacent battery cells are opposite in position, which helps to shorten the connection path of the tab. Since the first housing wall is provided with the first electrode terminal and the second electrode terminal, the electrode assembly can be communicated with the outside through the electrode terminal. And since the first connection portion connects the first main body portion and the second connection portion connects the second main body portion, the force-bearing area is increased, making both the first electrode terminal and the second electrode terminal have strong anti-deformation ability.

[0055] In some embodiments, at least two of the electrode terminals include a first electrode terminal and a second electrode terminal, and the maximum distance between the outer contours of the first electrode terminal and the second electrode terminal along the length direction of the first housing wall is in the range of 25 mm to 100 mm.

[0056] In this way, by defining the range of the maximum distance between the outer contours of the first electrode terminal and the second electrode terminal, not only the space occupied by the first electrode terminal and the second electrode terminal in the length direction of the first housing wall is defined, but also it is beneficial to make the distance between the first electrode terminal and the second electrode terminal appropriate so that the two are electrically insulated.

[0057] In some embodiments, along the length direction of the first housing wall, the size of the pressure relief mechanism ranges from 30 mm to 150 mm.

[0058] By defining the value range of the size of the pressure relief mechanism, the normal pressure relief function of the pressure relief mechanism is ensured, and the occupied space is appropriate, facilitating the arrangement of other components.

[0059] In some embodiments, the outer shell further includes a housing wall opposite to the first housing wall along the wall thickness direction of the first housing wall, two housing walls opposite to the length direction of the first housing wall, and two housing walls opposite to the width direction of the first housing wall. The size of the outer shell along the wall thickness direction of the first housing wall ranges from 50 mm to 200 mm, the size of the outer shell along the length direction of the first housing wall ranges from 200 mm to 450 mm, and the size of the outer shell along the width direction of the first housing wall ranges from 20 mm to 80 mm.

[0060] In this way, the outer shell forms a cuboid structure, and the value ranges of the length, width, and height of the outer shell are defined, making the battery cell a square shell battery, and defining the length, width, and height of the square shell battery, so that the battery cell is adapted to form a battery for providing higher energy.

[0061] The second aspect of the present application provides a battery, including: at least one of the above-mentioned battery cells.

[0062] Since the battery includes the battery cell provided in the first aspect, the battery includes all the beneficial effects of the battery cell. Therefore, the volumetric energy density of the battery is increased and the probability of short circuit is reduced.

[0063] In some embodiments, the battery further includes a sealed box body, the battery cell is disposed in the sealed box body, and the surface of the barrier portion of the battery cell facing away from the accommodation cavity abuts against the inner surface of the sealed box body.

[0064] The surface of the barrier portion facing away from the accommodation cavity abuts against the inner surface of the battery box, making the barrier against the diffusion of the sprayed material more rigorous, better playing a blocking role, and greatly reducing the probability of the sprayed material diffusing to contact the electrode terminal, thereby reducing the risk of short circuit and further improving the performance of the battery and prolonging the life of the battery.

[0065] In some embodiments, a bus bar is connected to the electrode terminal of the battery cell, and the distance between the surface of the barrier portion facing away from the accommodation cavity and the first housing wall is less than the distance between the surface of the bus bar facing away from the accommodation cavity and the first housing wall.

[0066] In this way, the occupation of space by the blocking part in the wall thickness direction of the first housing wall is reduced, and the volume energy density of the battery cell is further improved.

[0067] The third aspect of the present application provides an energy storage device, which includes a plurality of the above-mentioned battery cells or the above-mentioned batteries, and the battery cells or the batteries are used for storing electric energy and can provide electric energy.

[0068] Since the battery cell provided by the first aspect or the battery provided by the second aspect has a high volume energy density, the occupation of space in the energy storage device can be reduced or a higher total energy can be stored in a limited space. Moreover, the probability of short circuit in the energy storage device is also reduced.

[0069] The fourth aspect of the present application provides an electrical device, which includes the above-mentioned battery cell or the above-mentioned battery for providing electric energy.

[0070] Since the battery cell provided by the first aspect or the battery provided by the second aspect has a high volume energy density, the occupation of space in the electrical device can be reduced or a higher total energy can be stored in a limited space. Moreover, the probability of short circuit in the electrical device is also reduced.

[0071] Utility Model Effects

[0072] Through the present application, it is possible to provide a battery cell, a battery, an energy storage device, and an electrical device with high volume energy density and low probability of short circuit. Description of the Drawings

[0073] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0074] Figure 1 It is a three-dimensional structural schematic diagram of a battery cell in the prior art;

[0075] Figure 2 It is a three-dimensional structural schematic diagram of another battery cell in the prior art;

[0076] Figure 3 It is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0077] Figure 4 It is a three-dimensional exploded schematic diagram of a battery provided by some embodiments of the present application;

[0078] Figure 5Schematic perspective view of the first structure of the battery cell provided by some embodiments of the present application;

[0079] Figure 6 Exploded perspective view of the first structure of the battery cell provided by some embodiments of the present application;

[0080] Figure 7 Top view of the battery cell provided by some embodiments of the present application;

[0081] Figure 8 Cross-sectional view of the structure at the first cell wall of the battery cell provided by some embodiments of the present application;

[0082] Figure 9 For Figure 8 Exploded perspective view of the structure in

[0083] Figure 10 Schematic perspective view of the second structure of the battery cell provided by some embodiments of the present application;

[0084] Figure 11 Exploded perspective view of the structure at the first cell wall of the second structure of the battery cell provided by some embodiments of the present application;

[0085] Figure 12 Schematic perspective view of the battery cell grouping structure provided by some embodiments of the present application;

[0086] Figure 13 Cross-sectional view of the battery provided by some embodiments of the present application.

[0087] Explanation of reference numerals

[0088] In Figure 1 : 11' Top cover; 3' Terminal post; 4' Explosion-proof valve;

[0089] In Figure 2 : 3” Terminal post; 4” Explosion-proof valve;

[0090] In Figures 3 to 13 :

[0091] 1000 Vehicle; 100 Battery; 200 Controller; 300 Motor; 10 Battery box; 101 Box cover; 102 Box body; 20 Battery cells; 1 Outer shell; 11 First shell wall; 111 Mounting hole; 112 Liquid injection hole; 2 Electrode assembly; 21 Tab; 3 Electrode terminal; 31 Terminal plate; 32 Terminal board; 33 Connecting post; 3a First electrode terminal; 31a First terminal plate; 32a First terminal board; 321a First main body part; 322a First connecting part; 33a First connecting post; 3b Second electrode terminal; 31b Second terminal plate; 32b Second terminal board; 321b Second main body part; 322b Second connecting part; 33b Second connecting post; 4 Pressure relief mechanism; 5 Barrier part; 6 Insulator; 7 Barium piece; 8 Insulation structure; 8a First insulation structure; 8b Second insulation structure. Detailed implementation mode

[0092] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0093] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and the above drawings of this application are intended to cover non-exclusive inclusion.

[0094] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two, unless otherwise specifically defined.

[0095] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0096] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0097] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0098] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0099] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0100] Below, this application is described in detail.

[0101] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0102] In the embodiment of the present application, the battery includes a battery cell.

[0103] Figure 1 It is a schematic diagram of the three-dimensional structure of a battery cell in the prior art; Figure 2Schematic three-dimensional structure diagram of another battery cell in the prior art.

[0104] The inventors of the present application noticed that, as Figure 1 shown, the explosion-proof valve 4' of a conventional battery cell is provided at the center position of the top cover 11', and the pole posts 3' are provided on the end cover 11' and are located on opposite sides of the explosion-proof valve 4'. When the battery cell has a thermal runaway and sprays the valve, the high-temperature gas, liquid and other spray substances ejected from the explosion-proof valve 4' are likely to spread to the pole posts 3', causing the pole posts 3' and the top cover 11' to be electrically connected through the spray substances, resulting in short-circuit heating, and possibly causing thermal failure of the entire battery, thereby affecting the performance and life of the battery. As Figure 2 shown, for some battery cells, the pole posts 3'' and the explosion-proof valve 4'' are provided on different surfaces of the outer shell to reduce the probability that the leaked spray substances contact the pole posts 3''. However, since an exhaust channel needs to be reserved on the side where the explosion-proof valve 4'' is provided, the exhaust channel needs to occupy internal space, resulting in a relatively low volumetric energy density.

[0105] Through research, the inventors of the present application found that by arranging the explosion-proof valve and the pole posts on the same surface of the outer shell of the battery cell and providing a protruding structure capable of blocking the spray substances between the explosion-proof valve and the pole posts, it is possible to not only reduce the occupation of space and improve the volumetric energy density, but also reduce the probability that the spray substances spread to the pole posts, thereby reducing the probability of short circuit, and further improving the performance of the battery and extending the life of the battery.

[0106] Based on such a design concept, the inventors of the present application designed a battery cell, which includes an outer shell, an electrode assembly, an electrode terminal, a pressure relief mechanism and a barrier part. The outer shell has a receiving cavity, and the outer shell includes a first shell wall; at least part of the electrode assembly is arranged in the receiving cavity; the electrode terminal is arranged on the first shell wall and is electrically connected to the electrode assembly; the pressure relief mechanism is arranged on the first shell wall; the barrier part is arranged on the first shell wall, and at least part of the barrier part protrudes from the surface of the first shell wall facing away from the receiving cavity and is located between the pressure relief mechanism and the electrode terminal.

[0107] Both the pressure relief mechanism and the electrode terminal are arranged on the first shell wall, reducing the occupation of space in the receiving cavity, thereby improving the volumetric energy density of the battery cell. Moreover, a barrier part is arranged between the pressure relief mechanism and the electrode terminal, and the barrier part can block the spray substances discharged from the pressure relief mechanism, reducing the probability that the spray substances spread to contact the electrode terminal, thereby reducing the risk of short circuit, and further improving the performance of the battery and extending the life of the battery.

[0108] The battery cell provided by the embodiments of the present application can be used in, but is not limited to, power-consuming devices or energy storage devices. The power-consuming devices can be, but are not limited to, vehicles, ships, or aircraft, etc. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc. The energy storage devices can be, but are not limited to, energy storage containers, energy storage cabinets, etc.

[0109] The present application also provides a battery. The battery can include one or more battery cells to provide a single physical module with a higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0110] In the embodiments of the present application, "multiple" means two or more.

[0111] In some embodiments of the present application, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0112] In some embodiments of the present application, the battery can be a battery pack. The battery pack includes a battery box and battery cells. The battery cells or battery modules are accommodated in the battery box.

[0113] In some embodiments of the present application, the battery box can be a part of the chassis structure of a vehicle. For example, a part of the battery box can become at least a part of the floor of the vehicle, or a part of the battery box can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0114] The battery provided by the embodiments of the present application can be used in, but is not limited to, power-consuming devices or energy storage devices. The power-consuming devices can be, but are not limited to, vehicles, ships, or aircraft, etc. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc. The energy storage devices can be, but are not limited to, energy storage containers, energy storage cabinets, etc.

[0115] The embodiments of the present application also provide an energy storage device. The energy storage device includes battery cells or batteries.

[0116] The energy storage device provided by the embodiments of the present application can be, but is not limited to, energy storage containers, energy storage cabinets, etc.

[0117] The embodiments of the present application also provide a power-consuming device. The power-consuming device includes battery cells or batteries for providing electric energy.

[0118] The electrical devices provided by the embodiments of the present application may include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys may include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft may include airplanes, rockets, space shuttles, and spaceships, etc.

[0119] In the following embodiments, for the convenience of description, the electrical device in an embodiment of the present application is taken as the vehicle 1000 as an example for illustration. The following is described with reference to the accompanying drawings.

[0120] Figure 3 It is a schematic structural diagram of the vehicle 1000 provided by some embodiments of the present application.

[0121] The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. As Figure 3 shown, a battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000. For example, the battery 100 may serve as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0122] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0123] Figure 4 It is a three-dimensional exploded view of the battery 100 provided by the embodiments of the present application.

[0124] As Figure 4 shown, the battery 100 includes a battery box 10 and at least one battery cell 20. The battery box 10 is provided with a receiving space, and at least one battery cell 20 is received in the receiving space.

[0125] In some embodiments of the present application, the battery box 10 includes a box body 102 and a box cover 101. The box cover 101 covers the box body 102, so as to form the receiving space between the box body 102 and the box cover 101.

[0126] The box body 102 can be a hollow structure with one end open, and the box cover 101 can be a plate-like structure. The box cover 101 covers the open side of the box body 102 so that the box cover 101 and the box body 102 jointly define a receiving space; the box cover 101 and the box body 102 can also both be hollow structures with one side open, and the open side of the box cover 101 covers the open side of the box body 102. Of course, the battery box 10 formed by the box cover 101 and the box body 102 can be in various shapes, such as a cylinder, a cuboid, etc.

[0127] In the battery 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is placed in the receiving space formed by the box body 102 and the box cover 101; of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are received in the receiving space formed by the box body 102 and the box cover 101. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0128] In the embodiments of the present application, the battery cell 20 can be a secondary battery, which refers to a battery cell that can activate the active material through charging and continue to be used after the battery cell discharges.

[0129] The battery cell 20 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0130] The battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc., and the present application has no special limitation.

[0131] Next, with reference to Figures 5 to 13 Some embodiments of the present application will be described in detail.

[0132] Figure 5 A three-dimensional structure schematic diagram of the first structure of the battery cell provided for some embodiments of the present application; Figure 6 A three-dimensional exploded view of the first structure of the battery cell provided for some embodiments of the present application;

[0133] Figure 7 A top view of the battery cell provided for some embodiments of the present application;Figure 8 A cross-sectional view of the structure at the first housing wall of a battery cell provided in some embodiments of the present application; Figure 9 For Figure 8 An exploded perspective view of the structure in Figure 10 A perspective structural view of a second structure of a battery cell provided in some embodiments of the present application; Figure 11 An exploded perspective view of the structure at the first housing wall of a second structure of a battery cell provided in some embodiments of the present application; Figure 12 A perspective structural view of a battery cell grouping structure provided in some embodiments of the present application; Figure 13 A cross-sectional view of a battery provided in some embodiments of the present application.

[0134] A first aspect of the present application provides a battery cell 20, including a housing 1, an electrode assembly 2, an electrode terminal 3, a pressure relief mechanism 4, and a barrier portion 5. The housing 1 has a receiving cavity, and the housing 1 includes a first housing wall 11; at least a part of the electrode assembly 2 is disposed in the receiving cavity; the electrode terminal 3 is disposed on the first housing wall 11 and is electrically connected to the electrode assembly 2; the pressure relief mechanism 4 is disposed on the first housing wall 11; the barrier portion 5 is disposed on the first housing wall 11, at least a part of the barrier portion 5 protrudes from the surface of the first housing wall 11 facing away from the receiving cavity, and is located between the pressure relief mechanism 4 and the electrode terminal 3.

[0135] The electrode assembly 2 is a component that undergoes an electrochemical reaction in the battery cell 20. One or more electrode assemblies 2 may be included in the housing 1. The electrode assembly 2 includes a positive electrode plate, a negative electrode plate, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode plate and the negative electrode plate, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through. The portions of the positive electrode plate and the negative electrode plate having active substances constitute the main body portion of the electrode assembly 2, and the portions of the positive electrode plate and the negative electrode plate without active substances respectively constitute the electrode tabs 21. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion respectively. During the charging and discharging process of the battery, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the electrode terminal 3 is connected to the electrode tab 21.

[0136] As Figure 5 shown, the housing 1 has a plurality of housing walls. For the convenience of description, one of the housing walls is named the first housing wall 11. The electrode assembly 2 is located in the receiving cavity surrounded by the plurality of housing walls.

[0137] In some embodiments, the housing 1 is used to encapsulate components such as the electrode assembly 2 and the electrolyte. The housing 1 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum plastic film, etc.

[0138] In some embodiments, the outer shell can be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the outer shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating member or an aluminum-plastic film. As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cells include square shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. The polygonal prismatic batteries are, for example, hexagonal prismatic batteries, etc. Figures 5 to 13 In the illustrated embodiment, for ease of description, a square-shell battery cell is taken as an example for description.

[0139] In some embodiments, Figure 5 and Figure 6 As shown, the housing 1 includes a plurality of housing walls, a portion of which encloses a space having an opening, and the opening can be closed by another housing wall (e.g., the first housing wall 11) to form a receiving cavity for accommodating the electrode assembly 2 and electrolyte and other substances. The housing 1 may be provided with one or more openings. The housing wall (e.g., the first housing wall 11) that closes the opening may also be configured as a top cover.

[0140] like Figures 5 to 7 As shown, for the convenience of explanation, in the embodiment of the present disclosure, the housing wall where the electrode terminal 3 is located is referred to as the first housing wall 11. The electrode terminal 3 is provided on the first housing wall 11, and the electrode terminal 3 is connected to the pole ear 21 of the electrode assembly 2 to import or export the current in the electrode assembly 2. The electrode terminal 3 can be directly connected to the pole ear 21, or indirectly connected to the pole ear 21 through a transition component.

[0141] Optionally, there may be one, two, three or four electrode terminals 3. When there is one electrode terminal 3, the electrode terminal 3 may be the positive electrode and the housing 1 may be the negative electrode. The electrode terminal 3 may be located at the center of the first shell wall 11, or at a position of the first shell wall 11 at one end of the length direction X of the first shell wall 11 relative to the center position, or at a position of the first shell wall 11 at one end of the width direction Y of the first shell wall 11 relative to the center position. There is no special restriction on the specific position of the electrode terminal 3 in the first shell wall 11, as long as the electrical connection between the electrode terminal 3 and the pole ear 21 can be achieved. In a specific embodiment, as Figure 5 As shown, the electrode terminal 3 is located at a position of the first housing wall 11 that is offset from the center position toward one end of the length direction X of the first housing wall 11 .

[0142] The pressure relief mechanism 4 is a structure for releasing the internal pressure of the battery cell 20. When the internal pressure reaches a preset threshold, the pressure relief mechanism 4 will open, allowing gas and pressure to be released, so as to reduce the risk of the battery cell 20 bursting, exploding or catching fire.

[0143] The barrier portion 5 is a member that protrudes outward from the first housing wall 11. The protruding part is located between the pressure relief mechanism 4 and the electrode terminal 3. When the battery cell 20 sprays, the sprayed discharge will be blocked by the protruding part of the barrier portion 5 during diffusion, blocking the diffusion of the discharge to the electrode terminal 3, thereby reducing the probability of the discharge diffusing to contact the electrode terminal 3, thereby reducing the risk of short circuit, and further improving the performance of the battery and extending the life of the battery. The barrier portion 5 can be made of an insulating material, or a non-insulating material, such as a metal material, etc., or can be partially made of an insulating material and partially made of a non-insulating material.

[0144] The surface of the first housing wall 11 facing away from the accommodation cavity is the outer surface of the first housing wall 11. As Figure 5 shown, the dimension of the first housing wall 11 in the length direction X is greater than the dimension in the width direction Y. When the outer surface of the first housing wall 11 is a plane, the plane formed by the length direction X and the width direction Y of the first housing wall 11 is parallel to the outer surface of the first housing wall 11. Sometimes the width direction Y of the first housing wall 11 is also referred to as the thickness direction of the battery cell 20. Of course, the outer surface of the first housing wall 11 can also be a curved surface.

[0145] The pressure relief mechanism 4 and the electrode terminal 3 can be arranged along the length direction X, or along the width direction Y, or along a direction that intersects both the length direction X and the width direction Y. The intersection includes perpendicular intersection.

[0146] When the battery cell 20 undergoes thermal runaway, the internal pressure exceeds the threshold, the pressure relief mechanism 4 ruptures, and internal gas, liquid and other discharge substances spray outwards through the ruptured pressure relief mechanism 4. The gases spraying outwards include electrolyte vapor, hydrogen, oxygen, carbon dioxide or carbon monoxide and other gases, and the liquid spraying outwards is electrolyte.

[0147] Both the pressure relief mechanism 4 and the electrode terminal 3 are provided on the first housing wall 11, reducing the occupation of the space in the accommodation cavity, thereby increasing the volumetric energy density of the battery cell 20. Moreover, a barrier portion 5 is provided between the pressure relief mechanism 4 and the electrode terminal 3. The barrier portion 5 can block the discharge leaking from the pressure relief mechanism 4, reducing the probability of the discharge diffusing to contact the electrode terminal 3, thereby reducing the risk of short circuit, and further improving the performance of the battery and extending the life of the battery.

[0148] In some embodiments of the present application, on the projection plane perpendicular to the arrangement direction of the pressure relief mechanism 4 and the electrode terminal 3, the positive projection of the electrode terminal 3 entirely falls within the positive projection range of the barrier portion 5.

[0149] In this way, it is possible to better block the diffusion of the ejected material towards the electrode terminal 3, greatly reduce the probability of the ejected material diffusing to contact the electrode terminal 3, thereby further reducing the risk of short circuit, and then improving the performance of the battery and extending the service life of the battery.

[0150] Exemplarily, as Figure 7 shown, the pressure relief mechanism 4 and the electrode terminal 3 are arranged along the length direction X of the first housing wall 11. On the projection plane perpendicular to the length direction X, the positive projection of the electrode terminal 3 entirely falls within the positive projection range of the barrier portion 5.

[0151] In some embodiments of the present application, at least part of the barrier portion 5 is made of an insulating material.

[0152] The barrier portion 5 may be entirely made of an insulating material or may be partially made of an insulating material. The insulating material used for the barrier portion 5 may be a ceramic material, a plastic material, or the like.

[0153] The insulating material enables the barrier portion 5 to better play an electrical isolation role, thereby further reducing the risk of short circuit, and then improving the performance of the battery and extending the service life of the battery.

[0154] In some embodiments of the present application, the melting point of at least part of the material of the barrier portion 5 is above 400 °C.

[0155] In this way, it is possible to reduce the influence of the ejected material with too high a temperature on the barrier effect of the barrier portion 5 due to the melting of the barrier portion 5, so that the barrier portion 5 can better play a blocking role, thereby reducing the risk of short circuit and improving the performance of the battery and extending the service life of the battery.

[0156] In some embodiments of the present application, at least part of the barrier portion 5 is made of a ceramic material or a plastic material.

[0157] The ceramic material or the plastic material is a material with good insulation performance and a high melting point, which can not only reduce the probability of melting of the barrier portion 5, but also better play an electrical isolation role due to its insulation performance, thereby further reducing the risk of short circuit, and then improving the performance of the battery and extending the service life of the battery.

[0158] In some embodiments of the present application, the entire barrier portion 5 is provided on the side of the first housing wall 11 facing away from the accommodation cavity.

[0159] In this way, it can not only play a role in blocking the spread of the sprayed material to the electrode terminal 3, but also does not require the first housing wall 11 to be provided with a hole groove for installing the blocking portion 5, which is beneficial to improving the structural strength of the first housing wall 11 and reducing the probability of the internal electrolyte leaking out through the hole groove.

[0160] In some embodiments of the present application, the blocking portion 5 is welded to the first housing wall 11.

[0161] The blocking portion 5 is connected to the first housing wall 11 by welding. The welding operation is simple, and it can make the blocking portion 5 be entirely located on the side of the first housing wall 11 facing away from the accommodating cavity, and make the connection between the blocking portion 5 and the first housing wall 11 firm.

[0162] In some embodiments of the present application, the first housing wall 11 is provided with a mounting hole 111. The blocking portion 5 passes through the mounting hole 111. One end of the blocking portion 5 extends into the accommodating cavity, and the other end extends along the direction away from the accommodating cavity and protrudes from the surface of the first housing wall 11 facing away from the accommodating cavity.

[0163] In this way, part of the blocking portion 5 is penetrated into the first housing wall 11, which is beneficial to improving the reliability of the connection between the blocking portion 5 and the first housing wall 11.

[0164] In some embodiments of the present application, the blocking portion 5 is riveted to the first housing wall 11.

[0165] The first housing wall 11 is provided with a riveting hole. The blocking portion 5 is connected to the first housing wall 11 by riveting with the riveting hole, realizing the riveting of the blocking portion 5 on the first housing wall 11.

[0166] In this way, the blocking portion 5 is riveted to the first housing wall 11, and the connection reliability is strong.

[0167] In some embodiments of the present application, as Figure 6 shown, there is an insulating member 6 between the first housing wall 11 and the electrode assembly 2, and the blocking portion 5 is heat-melted to the insulating member 6.

[0168] The insulating member 6 is arranged on the inner surface of the first housing wall 11 and is used to isolate the electrical connection components in the outer shell 1 from the first housing wall 11 to reduce the risk of short circuit. Exemplarily, the insulating member 6 can be plastic, rubber, etc.

[0169] One end of the blocking portion 5 extending into the accommodating cavity is connected to the insulating member 6 by heat melting, and the connection strength is high. Thus, it is more beneficial to exert the blocking effect of the blocking portion 5, further reducing the risk of short circuit, and then improving the performance of the battery and extending the service life of the battery.

[0170] In some embodiments of the present application, the first housing wall 11 is provided with a liquid injection hole 112, and the blocking portion 5 is arranged between the liquid injection hole 112 and the electrode terminal 3.

[0171] The barrier part 5 is arranged between the liquid injection hole 112 and the electrode terminal 3. When the liquid injection hole 112 discharges gas, liquid or other ejection substances, the barrier part 5 can block the ejection substances from moving towards the electrode terminal 3, thereby reducing the probability of the ejection substances spreading to contact the electrode terminal 3, reducing the risk of short circuit, and further improving the performance of the battery and extending the service life of the battery.

[0172] In some embodiments of the present application, the liquid injection hole 112 is arranged between the barrier part 5 and the pressure relief mechanism 4.

[0173] In this way, on the one hand, the barrier part 5 is located between the liquid injection hole 112 and the electrode terminal 3, reducing the probability of the ejection substances ejected from the liquid injection hole 112 spreading to contact the electrode terminal 3. On the other hand, it is easy to make the pressure relief mechanism 4 far away from the electrode terminal 3, which is beneficial to reducing the probability of the ejection substances ejected from the pressure relief mechanism 4 spreading to contact the electrode terminal 3, further reducing the risk of short circuit, improving the performance of the battery and extending the service life of the battery.

[0174] In some embodiments of the present application, as Figure 7 shown, along the length direction X of the first housing wall 11, the closest distance L1 between the pressure relief mechanism 4 and the liquid injection hole 112 is not less than 20 mm.

[0175] As Figure 7 shown, along the length direction X of the first housing wall 11, the closest distance L1 between the pressure relief mechanism 4 and the liquid injection hole 112 represents the minimum distance between the outer contour of the pressure relief mechanism 4 and the outer contour of the liquid injection hole 112 in the length direction X of the first housing wall 11.

[0176] Exemplarily, along the length direction X of the first housing wall 11, the closest distance L1 between the pressure relief mechanism 4 and the liquid injection hole 112 can be but is not limited to 20 mm, 20.5 mm, 21 mm, 21.5 mm, 22 mm, 22.5 mm, 23 mm, 23.5 mm, 24 mm, 24.5 mm, 25 mm, 25.5 mm, 26 mm, 26.5 mm, 27 mm, 27.5 mm, 28 mm, 28.5 mm, 29 mm, 29.5 mm or 30 mm.

[0177] In this way, the distance between the pressure relief mechanism 4 and the liquid injection hole 112 is large enough, which can reduce the mutual influence between the pressure relief mechanism 4 and the liquid injection hole 112 to ensure their respective functions.

[0178] In some embodiments of the present application, along the length direction X of the first housing wall 11, the closest distance L2 between the liquid injection hole 112 and the electrode terminal 3 closest to the liquid injection hole 112 is not less than 20 mm.

[0179] As Figure 7As shown, along the length direction X of the first housing wall 11, the closest distance L2 between the liquid injection hole 112 and the electrode terminal 3 closest to the liquid injection hole 112 represents the minimum distance between the outer contour of the liquid injection hole 112 and the outer contour of the electrode terminal 3 closest to the liquid injection hole 112 in the length direction X of the first housing wall 11.

[0180] Exemplarily, along the length direction X of the first housing wall 11, the closest distance L2 between the liquid injection hole 112 and the electrode terminal 3 closest to the liquid injection hole 112 can be, but is not limited to, 20mm, 20.5mm, 21mm, 21.5mm, 22mm, 22.5mm, 23mm, 23.5mm, 24mm, 24.5mm, 25mm, 25.5mm, 26mm, 26.5mm, 27mm, 27.5mm, 28mm, 28.5mm, 29mm, 29.5mm or 30mm.

[0181] In this way, the distance between the liquid injection hole 112 and the electrode terminal 3 is large enough to reduce the probability that the ejected material from the liquid injection hole 112 spreads to contact the electrode terminal 3, thereby reducing the risk of short circuit and further improving the performance of the battery and extending the life of the battery.

[0182] In some embodiments of the present application, along the length direction X of the first housing wall 11, the size L3 of the liquid injection hole 112 is in the range of 6mm to 20mm.

[0183] As Figure 7 shown, the size L3 of the liquid injection hole 112 along the length direction X of the first housing wall 11 represents the maximum size of the outer contour of the liquid injection hole 112 in the length direction X of the first housing wall 11.

[0184] Exemplarily, the size L3 of the liquid injection hole 112 along the length direction X of the first housing wall 11 can be, but is not limited to, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0185] In this way, controlling the size L3 of the liquid injection hole 112 along the length direction X of the first housing wall 11 within a suitable range can well ensure the liquid injection function of the liquid injection hole 112 and will not occupy too much space on the first housing wall 11.

[0186] In some embodiments of the present application, the closest distance L4 between the electrode terminal 3 closest to the barrier portion 5 and the barrier portion 5 is not less than 5mm.

[0187] As Figure 7As shown, the closest distance L4 between the electrode terminal 3 closest to the distance blocking portion 5 and the blocking portion 5 represents the minimum distance between the outer contour of the electrode terminal 3 closest to the distance blocking portion 5 and the outer contour of the blocking portion 5 along the length direction X of the first housing wall 11.

[0188] Exemplarily, the closest distance L4 between the electrode terminal 3 closest to the distance blocking portion 5 and the blocking portion 5 can be, but is not limited to, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm or 32mm.

[0189] Thus, by defining the distance between the electrode terminal 3 and the blocking portion 5, the distance between the electrode terminal 3 and the pressure relief mechanism 4 is made large enough, further reducing the probability that the sprayed material spreads to contact the electrode terminal 3, thereby reducing the risk of short circuit and further improving the performance of the battery and extending the life of the battery.

[0190] In some embodiments of the present application, the closest distance L4 between the electrode terminal 3 closest to the distance blocking portion 5 and the blocking portion 5 is in the range of 10mm to 20mm.

[0191] Exemplarily, the closest distance L4 between the electrode terminal 3 closest to the distance blocking portion 5 and the blocking portion 5 can be, but is not limited to, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm.

[0192] Thus, by further defining the distance between the electrode terminal 3 and the blocking portion 5, the distance between the electrode terminal 3 and the pressure relief mechanism 4 is controlled within a suitable range, better reducing the probability that the sprayed material spreads to contact the electrode terminal 3, thereby further reducing the risk of short circuit and further improving the performance of the battery and extending the life of the battery.

[0193] In some embodiments of the present application, along the length direction X of the first housing wall 11, the distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 is not less than 5mm.

[0194] In the length direction X of the first housing wall 11, the distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 being not less than 5 mm means that in the length direction X of the first housing wall 11, the

[0195] spacing between the outer contour of the electrode terminal 3 closest to one end edge of the first housing wall 11 and this edge is not less than 5 mm. Exemplarily, as Figure 7 shown, the spacing between the left end of the leftmost electrode terminal 3 and the left end edge of the first housing wall 11 is not less than 5 mm.

[0196] Exemplarily, in the length direction X of the first housing wall 11, the distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 can be, but is not limited to, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm.

[0197] Thus, by defining the position of the electrode terminal 3 on the first housing wall 11, the electrode terminal 3 is suitable for connecting the tab 21 of the electrode assembly 2, ensuring the normal function of the electrode terminal 3.

[0198] In some embodiments of the present application, in the length direction X of the first housing wall 11, the closest distance L6 between the pressure relief mechanism 4 and the edge of the first housing wall 11 is not less than 10 mm.

[0199] In the length direction X of the first housing wall 11, the closest distance L6 between the pressure relief mechanism 4 and the edge of the first housing wall 11 being not less than 10 mm means that in the length direction X of the first housing wall 11, the spacing between the outer contour of the pressure relief mechanism 4 and the edge of the end closest to this pressure relief mechanism 4 is not less than 10 mm. Exemplarily, as Figure 7 shown, the spacing between the right end of the pressure relief mechanism 4 and the right end edge of the first housing wall 11 is not less than 10 mm.

[0200] Exemplarily, in the length direction X of the first housing wall 11, the closest distance L6 between the pressure relief mechanism 4 and the edge of the first housing wall 11 can be, but is not limited to, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm.

[0201] Thus, by defining the position of the pressure relief mechanism 4 on the first housing wall 11, the pressure relief mechanism 4 can spray the valve normally during thermal runaway, ensuring the normal function of the pressure relief mechanism 4.

[0202] In some embodiments of the present application, as Figure 8As shown, the dimension H1 of the blocking portion 5 protruding from the surface of the first housing wall 11 facing away from the accommodation cavity in the wall thickness direction Z of the first housing wall 11 is in the range of 4.7 mm to 30 mm.

[0203] The dimension H1 of the blocking portion 5 protruding from the surface of the first housing wall 11 facing away from the accommodation cavity in the wall thickness direction Z of the first housing wall 11 represents the dimension of the portion of the blocking portion 5 protruding from the outer surface of the first housing wall 11 in the wall thickness direction Z. Exemplarily, as Figure 8 shown, the distance between the upper end surface of the blocking portion 5 and the upper surface of the first housing wall 11 in the wall thickness direction Z is in the range of 4.7 mm to 30 mm.

[0204] Exemplarily, the dimension H1 of the blocking portion 5 protruding from the surface of the first housing wall 11 facing away from the accommodation cavity in the wall thickness direction Z of the first housing wall 11 can be, but is not limited to, 4.7 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm or 30 mm.

[0205] In this way, the height of the portion of the blocking portion 5 protruding from the outer surface of the first housing wall 11 is limited within an appropriate range, so that the blocking portion 5 can play a role in blocking the diffusion of the sprayed material, and the blocking portion 5 will not hinder the arrangement of other components in the wall thickness direction Z of the first housing wall 11.

[0206] In some embodiments of the present application, the dimension H1 of the blocking portion 5 protruding from the surface of the first housing wall 11 facing away from the accommodation cavity in the wall thickness direction Z of the first housing wall 11 is in the range of 6 mm to 15 mm.

[0207] By further limiting the height of the portion of the blocking portion 5 protruding from the outer surface of the first housing wall 11, the blocking portion 5 can better play the role of blocking the diffusion of the sprayed material, and the blocking portion 5 will not hinder the arrangement of other components in the wall thickness direction Z of the first housing wall 11.

[0208] In some embodiments of the present application, as Figure 8 shown, the dimension H1 of the blocking portion 5 protruding from the surface of the first housing wall 11 facing away from the accommodation cavity in the wall thickness direction Z of the first housing wall 11 is not less than the dimension H2 of the electrode terminal 3 protruding from the surface of the first housing wall 11 facing away from the accommodation cavity in the wall thickness direction Z of the first housing wall 11.

[0209] The dimension H1 by which the barrier portion 5 protrudes in the wall thickness direction Z of the first housing wall 11 from the surface of the first housing wall 11 facing away from the accommodation cavity is not less than the dimension H2 by which the electrode terminal 3 protrudes in the wall thickness direction Z of the first housing wall 11 from the surface of the first housing wall 11 facing away from the accommodation cavity, indicating that the height of the portion of the barrier portion 5 protruding from the outer surface of the first housing wall 11 is not less than the height of the portion of the electrode terminal 3 protruding from the outer surface of the first housing wall 11. Exemplarily, as Figure 8 shown, the distance H1 between the upper end surface of the barrier portion 5 and the upper surface of the first housing wall 11 is not less than the distance H2 between the upper end surface of the electrode terminal 3 and the upper surface of the first housing wall 11.

[0210] In this way, the blocking height of the barrier portion 5 is greater than the exposed height of the electrode terminal 3, which can more fully block the diffusion of the sprayed material towards the electrode terminal 3, thereby reducing the risk of short circuit, and further improving the performance of the battery and extending the service life of the battery.

[0211] In some embodiments of the present application, there are at least two electrode terminals 3, and the barrier portion 5 is provided between the pressure relief mechanism 4 and each electrode terminal 3.

[0212] There is a barrier portion 5 between any one of the electrode terminals 3 and the pressure relief mechanism 4, so that the diffusion of the sprayed material sprayed from the pressure relief mechanism 4 towards any one of the electrode terminals 3 is blocked by the barrier portion 5, thereby more comprehensively reducing the risk of short circuit, and further improving the performance of the battery and extending the service life of the battery.

[0213] In some embodiments of the present application, the electrode terminals 3 are arranged along the length direction X of the first housing wall 11; or, the electrode terminals 3 are arranged along the width direction Y of the first housing wall 11.

[0214] The electrode terminals 3 are arranged along the length direction X of the first housing wall 11, which can make the size of the outer shell 1 along the width direction Y of the first housing wall 11 relatively small, facilitating the electrical connection between the electrode terminals 3 and the tabs 21 of the electrode assembly 2. The electrode terminals 3 are arranged along the width direction Y of the first housing wall 11, which can make the size of the outer shell 1 along the length direction X of the first housing wall 11 relatively small, facilitating the electrical connection between the battery cells 20.

[0215] In some embodiments of the present application, as Figure 6 and Figure 9 shown, the electrode terminal 3 includes a terminal plate 31, and the terminal plate 31 is arranged on the side of the first housing wall 11 facing the accommodation cavity for electrical connection with the tab 21.

[0216] The terminal plate 31 can be made of a metal material, such as copper, aluminum, etc. Optionally, the terminal plate 31 is configured to be generally flat. The shape of the flat plate can be designed according to the situation, for example, it can be circular, Figure 9such as a square as shown.

[0217] Since the electrode terminal 3 includes a terminal plate 31 located within the first housing wall 11 of the housing 1, the electrode terminal 3 can be easily connected to the tab 21 of the electrode assembly 2 through the terminal plate 31.

[0218] In some embodiments of the present application, as Figure 9 and Figure 12 shown, the electrode terminal 3 further includes a terminal board 32. The terminal board 32 is disposed on the side of the first housing wall 11 facing away from the accommodation cavity and is used for electrically connecting to the bus bar 7. The bus bar 7 can achieve the electrical connection between the battery cells 20.

[0219] The terminal board 32 can be made of a metal material, such as copper, aluminum, etc. Optionally, the terminal board 32 is configured to be generally flat. The shape of the flat plate can be designed according to the situation. For example, it can be circular, Figure 9 such as a square as shown, Figure 11 such as an L-shape as shown.

[0220] The electrode terminal 3 can improve heat dissipation, enhance the support effect on the first housing wall 11, and increase the connection strength with the bus bar 7 by designing the terminal board 32 to be larger. The shape design degrees of freedom of the terminal board 32 and the terminal plate 31 are relatively high. Moreover, the terminal board 32 and the terminal plate 31 sandwich the first housing wall 11 from the inside and outside of the housing 1 respectively, which can improve the bending strength of the first housing wall 11.

[0221] As Figure 9 shown, the terminal board 32 and the terminal plate 31 are connected by a connecting post 33. The connecting post 33 is used to connect the terminal board 32. There are no restrictions on the shape, size or quantity of the connecting post 33, as long as the connection between the terminal board 32 and the terminal plate 31 can be achieved. In a specific embodiment, the connecting post 33 is cylindrical.

[0222] The connecting post 33 can be connected to the terminal board 32 or the terminal plate 31 by means of threaded connection, welding, riveting, etc., or can be integrally formed with the terminal board 32 or the terminal plate 31.

[0223] In some embodiments, as Figure 9 shown, the connecting post 33 is integrally formed with the terminal plate 31 and extends perpendicularly to the disk surface of the terminal plate 31. A through hole is formed in the terminal board 32, and the connecting post 33 is inserted into the through hole and fixedly connected to the terminal board 32. Thus, the electrode terminal 3 can be assembled to the first housing wall 11. Additionally, a terminal seal can be further assembled between the inner wall of the through hole of the connecting post 33 and the terminal board 32.

[0224] The terminal board 32 and the terminal plate 31 are connected together by the connecting post 33, and the formed structure serves as the electrode terminal 3 to draw or introduce current from the electrode assembly 2.

[0225] In some embodiments, as Figure 9 shown, an insulating structure 8 is provided between the terminal board 32 and the first housing wall 11.

[0226] The insulating structure 8 and the terminal board 32 are fixed to each other, and the fixing method can be integrally injection-molded, bonded, fastened together by connecting posts, etc.

[0227] In some embodiments of the present application, as Figure 7 shown, at least two electrode terminals 3 include a first electrode terminal 3a and a second electrode terminal 3b, and the maximum distance L7 between the outer contours of the first electrode terminal 3a and the second electrode terminal 3b along the length direction X of the first housing wall 11 is in the range of 25 mm to 100 mm.

[0228] As Figure 7 shown, the first electrode terminal 3a and the second electrode terminal 3b are arranged along the length direction X of the first housing wall 11, and the distance between the left end of the first electrode terminal 3a and the right end of the second electrode terminal 3b in the length direction X is in the range of 25 mm to 100 mm.

[0229] Exemplarily, the maximum distance L7 between the outer contours of the first electrode terminal 3a and the second electrode terminal 3b along the length direction X of the first housing wall 11 can be, but is not limited to, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm or 100 mm.

[0230] Thus, by limiting the range of the maximum distance between the outer contours of the first electrode terminal 3a and the second electrode terminal 3b, not only the space occupied by the first electrode terminal 3a and the second electrode terminal 3b in the length direction X of the first housing wall 11 is limited, but also it is beneficial to make the distance between the first electrode terminal 3a and the second electrode terminal 3b appropriate so that the two are electrically insulated.

[0231] In some embodiments of the present application, as Figure 10 and Figure 11As shown. At least two electrode terminals 3 include a first electrode terminal 3a and a second electrode terminal 3b. The first electrode terminal 3a includes a first main body portion 321a and a first connecting portion 322a connected to the first main body portion 321a. The second electrode terminal 3b includes a second main body portion 321b and a second connecting portion 322b connected to the second main body portion 321b. The first main body portion 321a and the second main body portion 321b are arranged along the length direction X of the first housing wall 11, and the projections of the first main body portion 321a and the second main body portion 321b along the length direction X at least partially overlap. The first connecting portion 322a and the second connecting portion 322b are arranged along the width direction Y of the first housing wall 11, and the projections of the first connecting portion 322a and the second connecting portion 322b along the width direction Y at least partially overlap.

[0232] The first main body portion 321a and the second main body portion 321b can be respectively configured as rectangles, circles, etc. The first main body portion 321a and the second main body portion 321b can be configured with the same shape and / or size, or can be configured with different shapes and / or sizes.

[0233] The first connecting portion 322a and the second connecting portion 322b can be respectively configured as rectangles extending along the length direction X, or can be configured as triangles tapering away from the first main body portion 321a. The present application does not make any special limitations on the specific shapes of the first connecting portion 322a and the second connecting portion 322b. The second connecting portion 322b can be configured with the same shape and / or size as the first connecting portion 322a, or can be configured with different shapes and / or sizes from the first connecting portion 322a.

[0234] Along the length direction X of the first housing wall 11, the first main body portion 321a is arranged on one side of the first connecting portion 322a. The first main body portion 321a and the first connecting portion 322a can be an integral structure or a split structure. The first main body portion 321a and the first connecting portion 322a are connected and conduct electricity with each other. Along the length direction X of the first housing wall 11, the second main body portion 321b is arranged on the side of the second connecting portion 322b away from the first main body portion 321a. The second main body portion 321b and the second connecting portion 322b can be an integral structure or a split structure. The second main body portion 321b and the second connecting portion 322b are connected and conduct electricity with each other.

[0235] In the battery cell 20 in the embodiment of the present disclosure, since the first connecting portion 322a and the second connecting portion 322b are arranged along the width direction Y of the first housing wall 11 and the projections along the width direction Y overlap, therefore, the installation positions of the first electrode terminal 3a and the second electrode terminal 3b are relatively concentrated, which helps to jointly bear the external force and reduce the degree of deformation, thereby improving the structural strength. As Figure 12As shown, since the first connection portion 322a and the second connection portion 322b are respectively used to connect with the tab 7, after the plurality of battery cells 20 are arranged along the width direction Y of the first housing wall 11, the first connection portions 322a and the second connection portions 322b of adjacent battery cells 20 are located opposite to each other, which helps to shorten the connection path of the tab 7. Since the first housing wall 11 is provided with the first electrode terminal 3a and the second electrode terminal 3b, the electrode assembly 2 can be connected to the outside through the electrode terminal 3.

[0236] Furthermore, since the first connection portion 322a is connected to the first main body portion 321a and the second connection portion 322b is connected to the second main body portion 321b, the force bearing area is increased, so that both the first electrode terminal 3a and the second electrode terminal 3b have strong anti-deformation ability.

[0237] In some embodiments of the present application, along the length direction X, the first main body 321a is connected to the first connection part 322a on one side close to the second main body 321b, and the second main body 321b is connected to the second connection part 322b on one side close to the first main body 321a, so that the first connection part 322a and the second connection part 322b are located between the first main body 321a and the second main body 321b. A distance is separated between the first connection part 322a and the second connection part 322b to prevent the first electrode terminal 3a and the second electrode terminal 3b from being connected. Along the width direction Y, the projection of the first connection part 322a partially overlaps with the second connection part 322b.

[0238] Since the first connection part 322a and the second connection part 322b are located between the first main body part 321a and the second main body part 321b along the length direction X, and the first connection part 322a and the second connection part 322b overlap along the width direction Y, the first connection part 322a and the second connection part 322b are close to each other so as to share the external force together. Compared with being subjected to force alone, they can withstand greater external force and have stronger anti-deformation ability.

[0239] like Figure 11 As shown, the first main body 321a and the first connecting part 322a are connected to form the first terminal plate 32a, the first main body 321a of the first terminal plate 32a is connected to the first connecting column 33a, the first connecting column 33a passes through the first housing wall 11, and the end of the first connecting column 33a away from the first main body 321a is connected to the first terminal plate 31a. The second main body 321b and the second connecting part 322b are connected to form the second terminal plate 32b, the second main body 321b of the second terminal plate 32b is connected to the second connecting column 33b, the second connecting column 33b passes through the first housing wall 11, and the end of the second connecting column 33b away from the second main body 321b is connected to the second terminal plate 31b.

[0240] likeFigure 11 As shown, a first insulating structure 8a is provided between the first terminal plate 32a and the first housing wall 11, and a second insulating structure 8b is provided between the second terminal plate 32b and the first housing wall 11.

[0241] In some embodiments of the present application, as Figure 7 shown, along the length direction X of the first housing wall 11, the size L8 of the pressure relief mechanism 4 is in the range of 30 mm to 150 mm.

[0242] As Figure 7 shown, the maximum distance between the left edge and the right edge of the pressure relief mechanism 4 is the size L8 of the pressure relief mechanism 4. Exemplarily, the size L8 of the pressure relief mechanism 4 along the length direction X of the first housing wall 11 can be but is not limited to 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm or 150 mm.

[0243] By defining the value range of the size L8 of the pressure relief mechanism 4, the normal pressure relief function of the pressure relief mechanism 4 is ensured, and the occupied space is appropriate, which is convenient for the arrangement of other components.

[0244] In some embodiments of the present application, as Figure 10 shown, the outer shell 1 further includes a housing wall opposite to the first housing wall 11 along the wall thickness direction Z of the first housing wall 11, two housing walls opposite to the first housing wall 11 along the length direction X, and two housing walls opposite to the first housing wall 11 along the width direction Y. The size W1 of the outer shell 1 along the wall thickness direction Z of the first housing wall 11 is in the range of 50 mm to 200 mm, the size W2 of the outer shell 1 along the length direction X of the first housing wall 11 is in the range of 200 mm to 450 mm, and the size W3 of the outer shell 1 along the width direction Y of the first housing wall 11 is in the range of 20 mm to 80 mm.

[0245] As Figure 10 shown, the size W1 of the outer shell 1 along the wall thickness direction Z of the first housing wall 11 represents the distance between the outer surfaces of the two housing walls opposite to each other along the wall thickness direction Z of the first housing wall 11. The size W2 of the outer shell 1 along the length direction X of the first housing wall 11 represents the distance between the outer surfaces of the two housing walls opposite to each other along the length direction X of the first housing wall 11. The size W3 of the outer shell 1 along the width direction Y of the first housing wall 11 represents the distance between the outer surfaces of the two housing walls opposite to each other along the width direction Y of the first housing wall 11.

[0246] Exemplarily, the dimension W1 of the outer shell 1 in the wall thickness direction Z of the first housing wall 11 may be, but is not limited to, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 135 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm or 200 mm. The dimension W2 of the outer shell 1 in the length direction X of the first housing wall 11 may be, but is not limited to, 200 mm, 210 mm, 220 mm, 230 mm, 240 mm, 250 mm, 260 mm, 270 mm, 280 mm, 290 mm, 300 mm, 310 mm, 320 mm, 330 mm, 340 mm, 350 mm, 360 mm, 370 mm, 380 mm, 390 mm, 400 mm, 410 mm, 420 mm, 430 mm, 440 mm or 450 mm. The dimension W3 of the outer shell 1 in the width direction Y of the first housing wall 11 may be, but is not limited to, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm or 80 mm.

[0247] In this way, the outer shell 1 forms a cuboid structure, and the value ranges of the length, width and height of the outer shell 1 are defined, so that the battery cell 20 becomes a square shell battery, and the length, width and height of the square shell battery are defined, so that the battery cell 20 is adapted to form the battery 100 for providing higher energy.

[0248] The second aspect of the present application provides a battery 100, including at least one battery cell 20 provided by the first aspect.

[0249] Since the battery 100 includes the battery cell 20 provided by the first aspect, and the battery 100 includes all the beneficial effects of the battery cell 20, the volumetric energy density of the battery 100 is improved and the probability of short circuit is reduced.

[0250] In some embodiments of the present application, as Figure 11 and Figure 12 shown, the battery 100 includes at least two battery cells 20 arranged along the width direction Y of the first housing wall 11, and adjacent battery cells 20 are electrically connected through the tab 7.

[0251] In some embodiments of the present application, as Figure 13 shown, the battery 100 further includes a battery box 10, the battery cell 20 is disposed in the battery box 10, and the surface of the barrier portion 5 of the battery cell 20 facing away from the accommodation cavity abuts against the inner surface of the battery box 10.

[0252] The part of the barrier portion 5 protruding from the housing 1 of the battery cell 20 is made of an insulating material, so that electrical isolation is achieved between the battery box 10 and the housing 1 of the battery cell 20, reducing the probability of the battery 100 short - circuiting.

[0253] The surface of the barrier portion 5 facing away from the accommodation cavity abuts against the inner surface of the battery box 10, making the barrier of the barrier portion 5 against the diffusion of the spillage more stringent, better playing a blocking role, and greatly reducing the probability of the spillage spreading to contact the electrode terminal 3, thereby reducing the risk of short - circuiting and further improving the performance of the battery and extending the battery life.

[0254] In some embodiments of the present application, a tab 7 is connected to the electrode terminal 3 of the battery cell 20, and the distance between the surface of the barrier portion 5 facing away from the accommodation cavity and the first housing wall 11 is less than the distance between the surface of the tab 7 facing away from the accommodation cavity and the first housing wall 11.

[0255] The part of the barrier portion 5 protruding from the housing 1 of the battery cell 20 is made of an insulating material, which is beneficial to improving the insulation performance between the tab 7 and the housing 1 of the battery cell 20 and reducing the probability of the battery 100 short - circuiting.

[0256] In this way, the occupation of space by the barrier portion 5 in the wall thickness direction Z of the first housing wall 11 is reduced, further improving the volume energy density of the battery cell 20.

[0257] The third aspect of the present application provides an energy storage device. The energy storage device includes a plurality of battery cells 20 provided in the first aspect or batteries 100 provided in the second aspect. The battery cells 20 or the batteries 100 are used to store electrical energy and can provide electrical energy.

[0258] Since the battery cells 20 provided in the first aspect or the batteries 100 provided in the second aspect have a high volume energy density, the occupation of space in the energy storage device can be reduced or a higher total energy can be stored in a limited space. Moreover, the probability of the energy storage device short - circuiting is also reduced.

[0259] The fourth aspect of the present application provides an electrical device. The electrical device includes the battery cells 20 provided in the first aspect or the batteries 100 provided in the second aspect for providing electrical energy.

[0260] Since the battery cells 20 provided in the first aspect or the batteries 100 provided in the second aspect have a high volume energy density, the occupation of space in the electrical device can be reduced or a higher total energy can be stored in a limited space. Moreover, the probability of the electrical device short - circuiting is also reduced.

[0261] Next, specific examples of some embodiments of the present application will be described with reference to the accompanying drawings.

[0262] As a specific example, the battery cell 20 includes an end cap and an aluminum shell. The end cap is composed of an end cap piece (the first housing wall 11), a lower plastic (the insulating member 6), an upper plastic (the insulating structure 8), a positive terminal (a structure composed of the first terminal plate 31a and the first connecting column 33a), a negative terminal (a structure composed of the second terminal plate 31b and the second connecting column 33b), a positive terminal riveting block (the first terminal board 32a), a negative terminal riveting block (the second terminal board 32b), an explosion-proof valve (the pressure relief mechanism 4), a sealing ring, and an additional heat-insulating plastic (the barrier portion 5) in the middle for partitioning. The explosion-proof valve is located at one end of the end cap along the length direction, while the two terminals are located at the other end of the end cap along the length direction. At the same time, a heat-insulating plastic is added in the middle of the end cap for partitioning. When the explosion-proof valve sprays, due to the long distance and the presence of heat-insulating plastic in the middle, when the high-temperature and high-pressure gas and liquid are ejected, the gas and liquid will be blocked by the heat-insulating plastic in the middle, reducing the propagation distance. At the same time, because of the long distance, it is also more difficult to transmit to the terminal area, greatly reducing the risk of the battery cell 20 failing after the explosion-proof valve sprays.

[0263] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, characterized in that: include: A housing having a receiving cavity, wherein the housing comprises a first housing wall; an electrode assembly, at least partially disposed in the accommodating cavity; an electrode terminal, disposed on the first housing wall and electrically connected to the electrode assembly; A pressure relief mechanism, provided on the first shell wall; The barrier portion is arranged on the first shell wall, at least part of the barrier portion protrudes from the surface of the first shell wall facing away from the accommodating cavity, and is located between the pressure relief mechanism and the electrode terminal.

2. The battery cell according to claim 1, characterized in that: On a projection plane perpendicular to the arrangement direction of the pressure relief mechanism and the electrode terminals, the orthographic projections of the electrode terminals all fall within the orthographic projection range of the blocking portion.

3. The battery cell according to claim 1, characterized in that: At least a portion of the barrier portion is made of insulating material.

4. The battery cell according to claim 3, characterized in that: The melting point of at least part of the material of the barrier portion is above 400°C.

5. The battery cell according to claim 4, characterized in that: At least a portion of the barrier portion is made of ceramic material or plastic material.

6. The battery cell according to claim 3, characterized in that: The blocking parts are all arranged on a side of the first shell wall facing away from the accommodating cavity.

7. The battery cell according to claim 6, characterized in that: The blocking portion is welded to the first shell wall.

8. The battery cell according to claim 1, characterized in that: The first shell wall is provided with a mounting hole, the blocking portion passes through the mounting hole, one end of the blocking portion extends into the accommodating cavity, and the other end extends in a direction away from the accommodating cavity and protrudes from the surface of the first shell wall away from the accommodating cavity.

9. The battery cell according to claim 8, characterized in that: The blocking portion is riveted to the first shell wall.

10. The battery cell according to claim 8, characterized in that: An insulating member is provided between the first shell wall and the electrode assembly, and the blocking portion is thermally melted to the insulating member.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The first shell wall is provided with a liquid injection hole, and the blocking portion is provided between the liquid injection hole and the electrode terminal.

12. The battery cell according to claim 11, characterized in that: The liquid injection hole is arranged between the blocking part and the pressure relief mechanism.

13. The battery cell according to claim 12, characterized in that: Along the length direction of the first shell wall, the shortest distance between the pressure relief mechanism and the liquid injection hole is not less than 20 mm.

14. The battery cell according to claim 12 or 13, characterized in that: Along the length direction of the first shell wall, the closest distance between the injection hole and the electrode terminal closest to the injection hole is not less than 20 mm.

15. The battery cell according to claim 12 or 13, characterized in that: Along the length direction of the first shell wall, the size of the injection hole is in the range of 6 mm to 20 mm.

16. The battery cell according to any one of claims 1 to 10, characterized in that: The shortest distance between the electrode terminal closest to the barrier portion and the barrier portion is not less than 5 mm.

17. The battery cell according to claim 16, characterized in that: The shortest distance between the electrode terminal closest to the barrier portion and the barrier portion is in the range of 10 mm to 20 mm.

18. The battery cell according to any one of claims 1 to 10, characterized in that: Along the length direction of the first housing wall, the distance between the electrode terminal and the edge of the first housing wall is not less than 5 mm.

19. The battery cell according to any one of claims 1 to 10, characterized in that: Along the length direction of the first shell wall, the closest distance between the pressure relief mechanism and the edge of the first shell wall is not less than 10 mm.

20. The battery cell according to any one of claims 1 to 10, characterized in that: A dimension of the blocking portion protruding from a surface of the first shell wall facing away from the accommodating cavity along a wall thickness direction of the first shell wall is in a range of 4.7 mm to 30 mm.

21. The battery cell according to claim 20, characterized in that: A dimension of the blocking portion protruding from a surface of the first shell wall facing away from the accommodating cavity along a wall thickness direction of the first shell wall is in a range of 6 mm to 15 mm.

22. The battery cell according to any one of claims 1 to 10, characterized in that: The dimension of the blocking portion protruding from the surface of the first shell wall facing away from the accommodating cavity along the wall thickness direction of the first shell wall is not less than the dimension of the electrode terminal protruding from the surface of the first shell wall facing away from the accommodating cavity along the wall thickness direction of the first shell wall.

23. The battery cell according to any one of claims 1 to 10, characterized in that: At least two electrode terminals are provided, and the blocking portion is provided between the pressure relief mechanism and each of the electrode terminals.

24. The battery cell according to claim 23, characterized in that: The electrode terminals are arranged along the length direction of the first housing wall; or The electrode terminals are arranged along a width direction of the first housing wall.

25. The battery cell according to claim 23, characterized in that: At least two of the electrode terminals include a first electrode terminal and a second electrode terminal, the first electrode terminal includes a first main body and a first connecting portion connected to the first main body, the second electrode terminal includes a second main body and a second connecting portion connected to the second main body, The first main body portion and the second main body portion are arranged along the length direction of the first shell wall, and the projections of the first main body portion and the second main body portion along the length direction at least partially overlap. The first connection portion and the second connection portion are arranged along a width direction of the first shell wall, and projections of the first connection portion and the second connection portion along the width direction at least partially overlap.

26. The battery cell according to claim 23, characterized in that: The at least two electrode terminals include a first electrode terminal and a second electrode terminal, and the maximum distance between the outer contour of the first electrode terminal and the outer contour of the second electrode terminal along the length direction of the first housing wall is in the range of 25 mm to 100 mm.

27. The battery cell according to any one of claims 1 to 10, characterized in that: Along the length direction of the first shell wall, the size of the pressure relief mechanism is in the range of 30 mm to 150 mm.

28. The battery cell according to any one of claims 1 to 10, characterized in that: The housing further comprises a housing wall opposite to the first housing wall along a wall thickness direction of the first housing wall, two housing walls opposite to the first housing wall along a length direction, and two housing walls opposite to the first housing wall along a width direction. The dimension of the shell along the wall thickness direction of the first shell wall is in the range of 50mm to 200mm, the dimension of the shell along the length direction of the first shell wall is in the range of 200mm to 450mm, and the dimension of the shell along the width direction of the first shell wall is in the range of 20mm to 80mm.

29. A battery, characterized in that: include: At least one battery cell according to any one of claims 1 to 28.

30. The battery according to claim 29, characterized in that The battery further comprises a sealed box body, the battery cell is arranged in the sealed box body, and the surface of the blocking portion of the battery cell facing away from the accommodating cavity abuts against the inner surface of the sealed box body.

31. The battery according to claim 29, characterized in that The electrode terminal of the battery cell is connected with a tab, and the distance between the surface of the blocking portion facing away from the accommodating cavity and the first shell wall is smaller than the distance between the surface of the tab facing away from the accommodating cavity and the first shell wall.

32. An energy storage device, characterized in that: The energy storage device comprises a plurality of battery cells according to any one of claims 1 to 28, or a battery according to any one of claims 29 to 31, wherein the battery cells or the battery are used to store electrical energy and can provide electrical energy.

33. An electrical device, characterized in that: The electrical device comprises the battery cell according to any one of claims 1 to 28 or the battery according to any one of claims 29 to 31 for providing electrical energy.

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