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

Abstract

A battery cell (20), a battery (100), an energy storage device and an electric device. The battery monomer (20) comprises a shell (1), an electrode assembly (2), an electrode terminal (3), a pressure relief mechanism (4) and a blocking part (5), the shell (1) is provided with an accommodating cavity, and the shell (1) comprises a first shell wall (11); the electrode assembly (2) is at least partially arranged in the accommodating cavity; the electrode terminal (3) is arranged on the first shell wall (11) and is electrically connected with the electrode assembly (2); the pressure relief mechanism (4) is arranged on the first shell wall (11); the blocking part (5) is arranged on the first shell wall (11), at least part of the blocking part (5) protrudes out of the surface, back to the containing cavity, of the first shell wall (11), and the blocking part (5) is located between the pressure relief mechanism (4) and the electrode terminal (3). The battery cell (20), the battery (100), the energy storage device and the electric device have high volume energy density and low short circuit probability.

Description

Battery cell, battery, energy storage device and electric device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, in particular to a battery cell, a battery, an energy storage device and an electric device. BACKGROUND

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

[0003] When the battery cell experiences thermal runaway and pressure relief, the spewed gas or liquid and the like from the pressure relief valve are prone to diffuse to the pole, and the pole and the shell are electrically connected through the spewed material, causing a short circuit, affecting the performance and service life of the battery. In addition, the industry continues to demand higher volumetric energy density of the battery.

[0004] SUMMARY

[0005] Therefore, the present disclosure aims to provide a battery cell, a battery, an energy storage device and an electric device with high volumetric energy density and low short circuit probability.

[0006] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions.

[0007] A first aspect of the present disclosure provides a battery cell, comprising: a shell having a receiving cavity, the shell comprising 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 portion 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.

[0008] The pressure relief mechanism and the electrode terminal are both disposed on the first shell wall, reducing the occupation of the space in the receiving cavity, thereby improving the volumetric energy density of the battery cell. Moreover, the barrier portion is disposed between the pressure relief mechanism and the electrode terminal, the barrier portion can block the spewed material from the pressure relief mechanism, reducing the probability of the spewed material diffusing to the electrode terminal, thereby reducing the risk of short circuit, and further improving the performance of the battery and prolonging the service life of the battery.

[0009] In some embodiments, in a projection plane perpendicular to the arrangement direction of the pressure relief mechanism and the electrode terminal, the orthogonal projection of the electrode terminal falls entirely within the orthogonal projection range of the barrier portion.

[0010] Thus, the diffusion of the spewed material towards the electrode terminal can be better blocked, the probability of the spewed material diffusing to contact the electrode terminal can be reduced to a greater extent, the risk of short circuit can be further reduced, and the performance of the battery and the service life of the battery can be further improved.

[0011] In some embodiments, at least part of the blocking part is made of insulating material.

[0012] The insulating material enables the blocking part to better play an electrical isolation role, thereby further reducing the risk of short circuit, and further improving the performance of the battery and prolonging the service life of the battery.

[0013] In some embodiments, the melting point of the material of at least part of the blocking part is above 400°C.

[0014] Thus, the spewed material can be prevented from affecting the blocking effect of the blocking part 5 on the spewed material due to the high temperature of the spewed material causing the blocking part 5 to melt, so that the blocking part can better play a blocking role, thereby reducing the risk of short circuit, improving the performance of the battery and prolonging the service life of the battery.

[0015] In some embodiments, at least part of the blocking part is made of ceramic material or plastic material.

[0016] The ceramic material or plastic material is a material with good insulation performance and high melting point, which can not only reduce the probability of the blocking part melting, but also better play an electrical isolation role due to its insulation performance, thereby further reducing the risk of short circuit, and further improving the performance of the battery and prolonging the service life of the battery.

[0017] In some embodiments, the blocking part is entirely arranged on the side of the first shell wall away from the accommodation cavity.

[0018] Thus, the diffusion of the spewed material towards the electrode terminal can be better blocked, and the first shell wall does not need to be provided with a hole slot for mounting the blocking part, which is conducive to improving the structural strength of the first shell wall and reducing the probability of the internal electrolyte leaking out through the hole slot.

[0019] In some embodiments, the blocking part is welded to the first shell wall.

[0020] The blocking part is connected to the first shell wall by welding, which is simple and convenient to operate, and enables the blocking part to be entirely arranged on the side of the first shell wall away from the accommodation cavity, and enables the blocking part and the first shell wall to be firmly connected.

[0021] In some embodiments, the first shell wall is provided with a mounting hole, the barrier portion passes through the mounting hole, one end of the barrier portion extends into the accommodating cavity, and the other end extends in a direction away from the accommodating cavity and protrudes from a surface of the first shell wall away from the accommodating cavity.

[0022] In this way, the barrier portion is partially arranged in the first shell wall, which is conducive to improving the connection reliability of the barrier portion and the first shell wall.

[0023] In some embodiments, the barrier portion is riveted to the first shell wall.

[0024] In this way, the barrier portion is riveted to the first shell wall, and the connection is reliable.

[0025] In some embodiments, the first shell wall and the electrode assembly are provided with an insulating member, and the barrier portion is heat-fused to the insulating member.

[0026] The end of the barrier portion extending into the accommodating cavity is connected to the insulating member by heat fusion, which has high connection strength, thereby facilitating the barrier effect of the barrier portion, reducing the risk of short circuit, and improving the performance and prolonging the service life of the battery.

[0027] In some embodiments, the first shell wall is provided with a liquid injection hole, and the barrier portion is arranged between the liquid injection hole and the electrode terminal.

[0028] The barrier portion is arranged between the liquid injection hole and the electrode terminal, and in the case of gas or liquid leakage from the liquid injection hole, the barrier portion can block the leakage from moving towards the electrode terminal, thereby reducing the probability of the leakage spreading to contact the electrode terminal, reducing the risk of short circuit, and improving the performance and prolonging the service life of the battery.

[0029] In some embodiments, the liquid injection hole is arranged between the barrier portion and the pressure relief mechanism.

[0030] In this way, the barrier portion is arranged between the liquid injection hole and the electrode terminal, which reduces the probability of the leakage from the liquid injection hole spreading to contact the electrode terminal, and the pressure relief mechanism is arranged far away from the electrode terminal, which reduces the probability of the leakage from the pressure relief mechanism spreading to contact the electrode terminal, thereby further reducing the risk of short circuit, improving the performance and prolonging the service life of the battery.

[0031] In some embodiments, the closest distance between the pressure relief mechanism and the liquid injection hole along the length direction of the first shell wall is not less than 20 mm.

[0032] 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, thereby ensuring their respective functions.

[0033] In some embodiments, the shortest distance between the injection hole and the electrode terminal closest to the injection hole along the length direction of the first shell wall is not less than 20mm.

[0034] In this way, the distance between the injection hole and the electrode terminal is large enough to reduce the probability of the spewed material from the injection hole spreading to contact the electrode terminal, thereby reducing the risk of short circuit and improving the performance and prolonging the life of the battery.

[0035] In some embodiments, the size of the injection hole along the length direction of the first shell wall is in the range of 6mm to 20mm.

[0036] In this way, the size of the injection hole along the length direction of the first shell wall is controlled within a suitable range, which can well ensure the injection function of the injection hole without occupying too much space of the first shell wall.

[0037] In some embodiments, the shortest distance between the electrode terminal closest to the barrier and the barrier is not less than 5mm.

[0038] In this way, by limiting the distance between the electrode terminal and the barrier, the distance between the electrode terminal and the pressure relief mechanism is large enough to further reduce the probability of the spewed material spreading to contact the electrode terminal, thereby further reducing the risk of short circuit and improving the performance and prolonging the life of the battery.

[0039] In some embodiments, the shortest distance between the electrode terminal closest to the barrier and the barrier is in the range of 10mm to 20mm.

[0040] In this way, by further limiting the distance between the electrode terminal and the barrier, the distance between the electrode terminal and the pressure relief mechanism is controlled within a suitable range to better reduce the probability of the spewed material spreading to contact the electrode terminal, thereby further reducing the risk of short circuit and improving the performance and prolonging the life of the battery.

[0041] In some embodiments, the distance between the electrode terminal and the edge of the first shell wall along the length direction of the first shell wall is not less than 5mm.

[0042] In this way, by limiting the position of the electrode terminal on the first shell wall, the electrode terminal is suitable for connecting the tab of the electrode assembly to ensure the normal function of the electrode terminal.

[0043] In some embodiments, the shortest distance between the pressure relief mechanism and the edge of the first shell wall along the length direction of the first shell wall is not less than 10mm.

[0044] Therefore, by limiting the position of the pressure relief mechanism on the first shell wall, the pressure relief mechanism can normally spray the valve when thermal runaway occurs, ensuring the normal function of the pressure relief mechanism.

[0045] In some embodiments, the barrier portion protrudes from the surface of the first shell wall away from the accommodation cavity in the thickness direction of the first shell wall by a dimension in the range of 4.7mm to 30mm.

[0046] Therefore, by limiting the height of the portion of the barrier portion protruding from the outer surface of the first shell wall to an appropriate range, the barrier portion can block the diffusion of the spray, and the arrangement of other components in the thickness direction of the first shell wall is not hindered.

[0047] In some embodiments, the barrier portion protrudes from the surface of the first shell wall away from the accommodation cavity in the thickness direction of the first shell wall by a dimension in the range of 6mm to 15mm.

[0048] By further limiting the height of the portion of the barrier portion protruding from the outer surface of the first shell wall, the barrier portion can better block the diffusion of the spray, and the arrangement of other components in the thickness direction of the first shell wall is not hindered.

[0049] In some embodiments, the dimension by which the barrier portion protrudes from the surface of the first shell wall away from the accommodation cavity in the thickness direction of the first shell wall is not less than the dimension by which the electrode terminal protrudes from the surface of the first shell wall away from the accommodation cavity in the thickness direction of the first shell wall.

[0050] Therefore, by making the blocking height of the barrier portion greater than the exposed height of the electrode terminal, the diffusion of the spray to the electrode terminal can be more fully blocked, thereby reducing the risk of short circuit, and further improving the performance and prolonging the life of the battery.

[0051] In some embodiments, the electrode terminal is provided with at least two, and the barrier portion is arranged between the pressure relief mechanism and each electrode terminal.

[0052] The barrier portion is arranged between any one of the electrode terminals and the pressure relief mechanism, so that the diffusion of the spray from the pressure relief mechanism towards any one of the electrode terminals is blocked by the barrier portion, thereby more fully reducing the risk of short circuit, and further improving the performance and prolonging the life of the battery.

[0053] In some embodiments, the electrode terminals are arranged along the length direction of the first shell wall; or, the electrode terminals are arranged along the width direction of the first shell wall.

[0054] The electrode terminals are arranged along the length direction of the first shell wall, which can make the size of the shell along the width direction of the first shell wall smaller, 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 shell wall, which can make the size of the shell along the length direction of the first shell wall smaller, facilitating the electrical connection between the battery monomers.

[0055] In some embodiments, the at least two electrode terminals include a first electrode terminal and a second electrode terminal, the first electrode terminal includes a first body part and a first connecting part connected to the first body part, the second electrode terminal includes a second body part and a second connecting part connected to the second body part, the first body part and the second body part are arranged along the length direction of the first shell wall, and the projections of the first body part and the second body part along the length direction at least partially overlap, the first connecting part and the second connecting part are arranged along the width direction of the first shell wall, and the projections of the first connecting part and the second connecting part along the width direction at least partially overlap.

[0056] In the battery monomer in the embodiments of the present disclosure, since the first connecting part and the second connecting part are arranged along the width direction of the first shell wall and the projections along the width direction overlap, the first electrode terminal and the second electrode terminal are arranged in a relatively concentrated position, which helps to jointly bear the external force and reduce the deformation degree, thereby improving the structural strength. Since the first connecting part and the second connecting part are respectively used to connect the gasket, after the plurality of battery monomers are arranged along the width direction of the first shell wall, the first connecting part and the second connecting part of adjacent battery monomers are opposite to each other, which helps to shorten the connection path of the gasket. Since the first shell wall is provided with the first electrode terminal and the second electrode terminal, the electrode assembly can be connected with the outside through the electrode terminals. Moreover, since the first connecting part connects the first body part and the second connecting part connects the second body part, the stress area is increased, so that the first electrode terminal and the second electrode terminal both have strong anti-deformation ability.

[0057] In some embodiments, the at least two electrode terminals include a first electrode terminal and a second electrode terminal, 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 shell wall is in the range of 25mm-100mm.

[0058] In this way, by limiting the range of the maximum distance between the outer contour of the first electrode terminal and the outer contour of the second electrode terminal, the space occupied by the first electrode terminal and the second electrode terminal in the length direction of the first shell wall is limited, and the distance between the first electrode terminal and the second electrode terminal is appropriately limited to electrically isolate the first electrode terminal and the second electrode terminal.

[0059] In some embodiments, the size of the pressure relief mechanism along the length direction of the first housing wall is in the range of 30mm-150mm.

[0060] By limiting 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.

[0061] In some embodiments, the housing further comprises 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 housing along the wall thickness direction of the first housing wall is in the range of 50mm-200mm, the size of the housing along the length direction of the first housing wall is in the range of 200mm-450mm, and the size of the housing along the width direction of the first housing wall is in the range of 20mm-80mm.

[0062] In this way, the housing forms a cuboid structure, and the length, width and height of the housing are limited to the ranges, so that the battery cell is a square cell, and the length, width and height of the square cell are limited, so that the battery cell is adapted to the battery for providing higher energy.

[0063] The second aspect of the present disclosure provides a battery, comprising at least one battery cell as described above.

[0064] Since the battery comprises the battery cell provided by the first aspect, the battery comprises all the beneficial effects of the battery cell, so that the volume energy density of the battery is improved and the probability of short circuit is reduced.

[0065] In some embodiments, the battery further comprises a sealed box, and the battery cell is arranged in the sealed box, and the surface of the barrier portion opposite to the accommodation cavity abuts against the inner surface of the sealed box.

[0066] The surface of the barrier portion opposite to the accommodation cavity abuts against the inner surface of the battery box, so that the barrier portion blocks the diffusion of the spray more tightly, better plays a blocking role, and reduces the probability of the diffusion of the spray to contact the electrode terminal to a greater extent, thereby reducing the risk of short circuit, and further improving the performance of the battery and prolonging the service life of the battery.

[0067] In some embodiments, the electrode terminal of the battery cell is connected with a gasket, and the distance between the surface of the barrier portion opposite to the accommodation cavity and the first housing wall is less than the distance between the surface of the gasket opposite to the accommodation cavity and the first housing wall.

[0068] Thus, the occupation of the space in the thickness direction of the first housing wall by the barrier portion is reduced, and the volumetric energy density of the battery cell is further improved.

[0069] A third aspect of the present disclosure provides an energy storage device, which includes a plurality of the battery cell or the battery as described above, and is configured to store and provide electrical energy.

[0070] Since the battery cell according to the first aspect or the battery according to the second aspect has a high volumetric energy density, the occupation of the space in the energy storage device can be reduced, or a higher total energy can be stored in a limited space, and the probability of short circuit of the energy storage device is also reduced.

[0071] A fourth aspect of the present disclosure provides an electrical device, which includes the battery cell or the battery as described above and is configured to provide electrical energy.

[0072] Since the battery cell according to the first aspect or the battery according to the second aspect has a high volumetric energy density, the occupation of the space in the electrical device can be reduced, or a higher total energy can be stored in a limited space, and the probability of short circuit of the electrical device is also reduced.

[0073] Thus, the battery cell, the battery, the energy storage device and the electrical device with high volumetric energy density and low probability of short circuit can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0074] FIG. 1 is a schematic diagram of a battery cell according to the prior art;

[0075] FIG. 2 is a schematic diagram of another battery cell according to the prior art;

[0076] FIG. 3 is a schematic diagram of a vehicle according to some embodiments of the present disclosure;

[0077] FIG. 4 is a schematic diagram of a battery according to some embodiments of the present disclosure;

[0078] FIG. 5 is a schematic diagram of a first structure of a battery cell according to some embodiments of the present disclosure;

[0079] FIG. 6 is a schematic diagram of a first structure of a battery cell according to some embodiments of the present disclosure;

[0080] FIG. 7 is a top view of a battery cell according to some embodiments of the present disclosure;

[0081] FIG. 8 is a sectional view of a structure at a first housing wall of a battery cell according to some embodiments of the present disclosure;

[0082] FIG. 9 is a schematic diagram of the structure in FIG. 8;

[0083] Fig. 10 is a perspective structural schematic view of a second structure of a battery cell provided by some embodiments of the present disclosure;

[0084] Fig. 11 is a perspective exploded view of a structure at a first shell wall of a second structure of a battery cell provided by some embodiments of the present disclosure;

[0085] Fig. 12 is a perspective structural schematic view of a group structure of battery cells provided by some embodiments of the present disclosure;

[0086] Fig. 13 is a sectional view of a battery provided by some embodiments of the present disclosure.

[0087] Explanation of Reference Signs

[0088] In Fig. 1: 11' is a top cover; 3' is a pole; 4' is a relief valve;

[0089] In Fig. 2: 3" is a pole; 4" is a relief valve;

[0090] In Figs. 3 to 13: 1000 is a vehicle; 100 is a battery; 200 is a controller; 300 is a motor; 10 is a battery box; 101 is a box cover; 102 is a box body; 20 is a battery cell; 1 is a shell; 11 is a first shell wall; 111 is a mounting hole; 112 is a liquid injection hole; 2 is an electrode assembly; 21 is a tab; 3 is an electrode terminal; 31 is a terminal disc; 32 is a terminal plate; 33 is a connecting post; 3a is a first electrode terminal; 31a is a first terminal disc; 32a is a first terminal plate; 321a is a first main body part; 322a is a first connecting part; 33a is a first connecting post; 3b is a second electrode terminal; 31b is a second terminal disc; 32b is a second terminal plate; 321b is a second main body part; 322b is a second connecting part; 33b is a second connecting post; 4 is a pressure relief mechanism; 5 is a barrier part; 6 is an insulating member; 7 is a gasket; 8 is an insulating structure; 8a is a first insulating structure; 8b is a second insulating structure. DETAILED DESCRIPTION

[0091] It should be noted that the embodiments and technical features in the present disclosure and the embodiments can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and illustration of the purpose of the present disclosure, and should not be regarded as an improper limitation of the present disclosure.

[0092] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "include" and "have" and any variations thereof in the specification and the above description of drawings of the present disclosure are intended to cover non-exclusive inclusion.

[0093] In the description of the disclosure, the technical terms "first", "second", "third", "fourth" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the disclosure, the meaning of "a plurality of" is more than two, unless otherwise explicitly and specifically limited.

[0094] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0095] In the description of the disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0096] In the description of the embodiments of the disclosure, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the disclosure and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed in a particular orientation, be operated or used, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0097] In the description of the disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the disclosure can be understood according to the specific circumstances.

[0098] In the description of the disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0099] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "parallel" and "perpendicular" allow a certain degree of tolerance and / or error, including approximately parallel, approximately perpendicular.

[0100] Hereinafter, the present disclosure will be described in detail.

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

[0102] In the embodiments of the present disclosure, the battery comprises a battery cell.

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

[0104] The inventors of the present disclosure have found that, as shown in FIG. 1, the explosion-proof valve 4' of the conventional battery cell is arranged at the center of the top cover 11', and the pole 3' is arranged at the end cover 11' and located at the opposite sides of the explosion-proof valve 4'. When the battery cell is thermal runaway, the high-temperature gas and liquid and other spewings spewed from the explosion-proof valve 4' are easy to diffuse to the pole 3', so that the pole 3' and the top cover 11' are electrically connected through the spewings, causing short circuit and temperature rise, and the thermal failure of the entire battery may occur, thereby affecting the performance and life of the battery. As shown in FIG. 2, the poles 3" and the explosion-proof valves 4" of some battery cells are arranged on different surfaces of the shell, so as to reduce the probability of the spewings contacting the poles 3". However, since one side of the explosion-proof valve 4" needs to reserve an exhaust passage, the exhaust passage needs to occupy the internal space, thereby resulting in low volumetric energy density.

[0105] The inventors of the present disclosure have found that, by arranging the explosion-proof valve and the pole on the same surface of the shell of the battery cell, and arranging a convex structure capable of blocking the spewings between the explosion-proof valve and the pole, the space occupation can be reduced, the volumetric energy density can be improved, the probability of the spewings diffusing to the pole can be reduced, the probability of short circuit can be reduced, and the performance of the battery can be improved and the life of the battery can be prolonged.

[0106] Based on such design concept, the inventor of the present disclosure designs a battery cell, which comprises a shell, an electrode assembly, an electrode terminal, a pressure relief mechanism and a barrier portion, the shell has a receiving cavity, and the shell comprises 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 electrically connected with the electrode assembly; the pressure relief mechanism is arranged on the first shell wall; and the barrier portion is arranged on the first shell wall, at least part of the barrier portion protrudes from a 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] The pressure relief mechanism and the electrode terminal are both arranged on the first shell wall, which reduces the occupation of the space in the receiving cavity, thereby improving the volume energy density of the battery cell. Moreover, the barrier portion is arranged between the pressure relief mechanism and the electrode terminal, the barrier portion can block the spray from the pressure relief mechanism, reduce the probability of the spray spreading to contact the electrode terminal, thereby reducing the risk of short circuit, and further improving the performance of the battery and prolonging the service life of the battery.

[0108] The battery cell provided by the embodiments of the present disclosure can be used in an electric device or an energy storage device, but is not limited to this. The electric device can be, but is not limited to, a vehicle, a ship or an aircraft, etc. For example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0109] The present disclosure also provides a battery, which can comprise one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in a mixed manner through a busbar.

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

[0111] In some embodiments of the present disclosure, the battery can be a battery module, and 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 disclosure, the battery can be a battery pack, and the battery pack comprises a battery box and a battery cell, and the battery cell or the battery module is accommodated in the battery box.

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

[0114] The battery provided by the embodiments of the present disclosure can be used in an electric device or an energy storage device, but is not limited thereto. The electric device can be, but is not limited to, a vehicle, a ship or an aircraft, etc. For example, the electric device can be a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship, a spacecraft, etc. For example, the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0115] The embodiments of the present disclosure also provide an energy storage device. The energy storage device includes a battery cell or a battery.

[0116] The energy storage device provided by the embodiments of the present disclosure can be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0117] The embodiments of the present disclosure also provide an electric device. The electric device includes a battery cell or a battery for providing electric energy.

[0118] The electric device provided by the embodiments of the present disclosure can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a stationary or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0119] In the following embodiments, for the convenience of description, the electric device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following description is made in conjunction with the accompanying drawings.

[0120] FIG. 3 is a structural schematic diagram of the vehicle 1000 provided by some embodiments of the present disclosure.

[0121] The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. As shown in FIG. 3, the vehicle 1000 is internally provided with a battery 100. The battery 100 can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can 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, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0122] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0123] FIG. 4 is a perspective exploded schematic view of the battery 100 according to an embodiment of the present disclosure.

[0124] As shown in FIG. 4, the battery 100 includes a battery case 10 and at least one battery cell 20, the battery case 10 is provided with an accommodation space, and the at least one battery cell 20 is accommodated in the accommodation space.

[0125] In some embodiments of the present disclosure, the battery case 10 includes a case body 102 and a case cover 101, the case cover 101 covers the case body 102, so as to form the accommodation space between the case body 102 and the case cover 101.

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

[0127] In the battery 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner, the mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and then the whole formed by the multiple battery cells 20 is placed in the accommodation space formed by the case body 102 and the case cover 101; of course, the battery 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, and the whole is accommodated in the accommodation space formed by the case body 102 and the case cover 101. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing electrical connection between the multiple battery cells 20.

[0128] In the embodiments of the present disclosure, the battery cell 20 can be a secondary battery, which means that the battery cell can be activated by charging after discharging to continue to be used.

[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-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0130] The battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell with other shapes, the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery, for example, a hexagonal prism battery, etc., and the present disclosure is not particularly limited.

[0131] Some embodiments of the present disclosure will be described in detail below with reference to Figs. 5-13.

[0132] Fig. 5 is a perspective view of a first structure of a battery cell according to some embodiments of the present disclosure; Fig. 6 is an exploded view of the first structure of the battery cell according to some embodiments of the present disclosure; Fig. 7 is a top view of the battery cell according to some embodiments of the present disclosure; Fig. 8 is a sectional view of a structure at a first housing wall of the battery cell according to some embodiments of the present disclosure; Fig. 9 is an exploded view of the structure of Fig. 8; Fig. 10 is a perspective view of a second structure of a battery cell according to some embodiments of the present disclosure; Fig. 11 is an exploded view of a structure at a first housing wall of the second structure of the battery cell according to some embodiments of the present disclosure;

[0133] Fig. 12 is a perspective view of a structure of a group of battery cells according to some embodiments of the present disclosure; Fig. 13 is a sectional view of a battery according to some embodiments of the present disclosure.

[0134] A first aspect of the present disclosure provides a battery cell 20, comprising a housing 1, an electrode assembly 2, an electrode terminal 3, a pressure relief mechanism 4, and a barrier 5. The housing 1 has a receiving cavity, and the housing 1 comprises a first housing wall 11. The electrode assembly 2 is at least partially disposed in the receiving cavity. The electrode terminal 3 is disposed on the first housing wall 11 and electrically connected to the electrode assembly 2. The pressure relief mechanism 4 is disposed on the first housing wall 11. The barrier 5 is disposed on the first housing wall 11, at least a portion of the barrier 5 protrudes from a 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 in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 2 can be contained within the housing 1. The electrode assembly 2 includes a positive electrode sheet, a negative electrode sheet, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode and the negative electrode. The separator is disposed between the positive electrode sheet and the negative electrode sheet, and can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 2, and portions without active materials that each constitute a tab 21. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery, the positive active material and the negative active material react with the electrolyte, and the electrode terminal 3 is connected to the tab 21.

[0136] As shown in Fig. 5, the housing 1 has a plurality of housing walls, for the sake of convenience, one of the housing walls is named as 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 shell 1 is used to encapsulate the electrode assembly 2 and electrolyte and the like. The shell 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film, or the like.

[0138] In some embodiments, the shell can be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell serves to protect the electrode assembly, and a sealing bag is further included between the shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing 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 pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, such as a hexagonal prismatic battery cell, and the like. In the embodiments shown in FIGS. 5 to 13, a square shell battery cell is taken as an example for illustration.

[0139] In some embodiments, as shown in FIGS. 5 and 6, the shell 1 includes a plurality of shell walls, and a portion of the shell walls enclose a space with an opening, which can be closed by another shell wall (for example, the first shell wall 11) to form a receiving cavity for receiving the electrode assembly 2 and the electrolyte and the like. The shell 1 can be provided with one or more openings. The shell wall (for example, the first shell wall 11) that closes the opening can also be configured as a top cover.

[0140] As shown in FIGS. 5 to 7, for the convenience of illustration, in the embodiments of the present disclosure, the shell wall where the electrode terminal 3 is located is referred to as the first shell wall 11. The electrode terminal 3 is provided on the first shell wall 11, and the electrode terminal 3 is connected with the tab 21 of the electrode assembly 2 to lead the current in or out of the electrode assembly 2. The electrode terminal 3 can be directly connected with the tab 21, or indirectly connected with the tab 21 through an adapter member.

[0141] Optionally, the electrode terminal 3 can be one, two, three, or four, or the like. When the electrode terminal 3 is one, the electrode terminal 3 can be a positive electrode, and the shell 1 is a negative electrode. The electrode terminal 3 can be located at the center position of the first shell wall 11, or at a position deviated from the center position to one end of the length direction X of the first shell wall 11, or at a position deviated from the center position to one end of the width direction Y of the first shell wall 11. There is no special limitation on the specific position of the electrode terminal 3 on the first shell wall 11, as long as the electrical connection between the electrode terminal 3 and the tab 21 can be achieved. In one specific embodiment, as shown in FIG. 5, the electrode terminal 3 is located at a position deviated from the center position to one end of the length direction X of the first shell wall 11.

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

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

[0144] The surface of the first shell wall 11 facing away from the accommodation cavity is the outer surface of the first shell wall 11. As shown in FIG. 5, the length direction X of the first shell wall 11 is greater than the width direction Y, and when the outer surface of the first shell wall 11 is a plane, the plane formed by the length direction X of the first shell wall 11 and the width direction Y of the first shell wall 11 is parallel to the outer surface of the first shell wall 11. Sometimes the width direction Y of the first shell wall 11 is also referred to as the thickness direction of the battery cell 20. Of course, the outer surface of the first shell 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 intersecting both the length direction X and the width direction Y. The intersection includes perpendicular intersection.

[0146] When the battery cell 20 experiences thermal runaway, the internal pressure exceeds the threshold, the pressure relief mechanism 4 ruptures, and the spray of the internal gas and liquid, etc. is sprayed outwards through the ruptured pressure relief mechanism 4. The outwardly sprayed gas includes electrolyte vapor, hydrogen, oxygen, carbon dioxide or carbon monoxide, etc. The outwardly sprayed liquid is electrolyte.

[0147] The pressure relief mechanism 4 and the electrode terminal 3 are both provided on the first shell wall 11, reducing the occupation of the space in the accommodation cavity, thereby improving the volume energy density of the battery cell 20. Moreover, the barrier portion 5 is provided between the pressure relief mechanism 4 and the electrode terminal 3, and the barrier portion 5 can block the spray of the pressure relief mechanism 4, reducing the probability of the spray diffusing to contact the electrode terminal 3, thereby reducing the risk of short circuit, and further improving the performance and prolonging the life of the battery.

[0148] In some embodiments of the present disclosure, the electrode terminal 3 is arranged along the length direction X of the first housing wall 11, and the normal projection of the electrode terminal 3 falls within the normal projection range of the blocking portion 5 on a projection plane perpendicular to the arrangement direction of the pressure relief mechanism 4 and the electrode terminal 3.

[0149] In this way, the diffusion of the spray toward the electrode terminal 3 can be better blocked, and the probability of the spray diffusing to contact the electrode terminal 3 can be reduced to a greater extent, thereby further reducing the risk of short circuit and improving the performance and prolonging the service life of the battery.

[0150] For example, as shown in FIG. 7, the pressure relief mechanism 4 and the electrode terminal 3 are arranged along the length direction X of the first housing wall 11, and the normal projection of the electrode terminal 3 falls within the normal projection range of the blocking portion 5 on a projection plane perpendicular to the length direction X.

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

[0152] The blocking portion 5 can be made of insulating material or part of the blocking portion 5 can be made of insulating material. The insulating material used by the blocking portion 5 can be ceramic material or plastic material, etc.

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

[0154] In some embodiments of the present disclosure, at least part of the blocking portion 5 is made of material with a melting point of 400°C or higher.

[0155] In this way, the spray can be prevented from affecting the blocking effect of the blocking portion 5 on the spray due to the high temperature of the spray, thereby enabling the blocking portion 5 to better play a blocking role, thereby reducing the risk of short circuit and improving the performance and prolonging the service life of the battery.

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

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

[0158] In some embodiments of the present disclosure, the blocking portion 5 is entirely arranged on the side of the first housing wall 11 facing away from the accommodation cavity.

[0159] In this way, the barrier portion 5 can prevent the spewing material from spreading to the electrode terminal 3, and the first shell wall 11 does not need to be provided with a hole slot for mounting the barrier portion 5, which is beneficial to improve the structural strength of the first shell wall 11 and reduce the probability of internal electrolyte leakage through the hole slot.

[0160] In some embodiments of the present disclosure, the barrier portion 5 is welded to the first shell wall 11.

[0161] The barrier portion 5 is connected to the first shell wall 11 by welding, which is simple and convenient, and can make the barrier portion 5 entirely arranged on the side of the first shell wall 11 away from the accommodation cavity, and make the barrier portion 5 and the first shell wall 11 firmly connected.

[0162] In some embodiments of the present disclosure, the first shell wall 11 is provided with a mounting hole 111, and the barrier portion 5 passes through the mounting hole 111, one end of the barrier portion 5 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 shell wall 11 away from the accommodation cavity.

[0163] In this way, part of the barrier portion 5 is arranged in the first shell wall 11, which is beneficial to improve the firmness of the connection between the barrier portion 5 and the first shell wall 11.

[0164] In some embodiments of the present disclosure, the barrier portion 5 is riveted to the first shell wall 11.

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

[0166] In this way, the barrier portion 5 is riveted to the first shell wall 11, which is firm in connection.

[0167] In some embodiments of the present disclosure, as shown in FIG. 6, the first shell wall 11 and the electrode assembly 2 are provided with an insulating member 6, and the barrier portion 5 is heat-fused to the insulating member 6.

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

[0169] The end of the barrier portion 5 extending into the accommodation cavity is connected to the insulating member 6 by heat fusion, which has high connection strength, thereby being more beneficial to play the blocking effect of the barrier portion 5, thereby further reducing the risk of short circuit, and further improving the performance and prolonging the service life of the battery.

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

[0171] The barrier portion 5 is arranged between the liquid injection hole 112 and the electrode terminal 3. In the case where the liquid injection hole 112 leaks out a spewing matter such as gas or liquid, the barrier portion 5 can block the spewing matter from moving toward the electrode terminal 3, thereby reducing the probability of the spewing matter spreading to contact the electrode terminal 3, and further reducing the risk of short circuit, and improving the performance of the battery and prolonging the life of the battery.

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

[0173] In this way, not only is the barrier portion 5 arranged between the liquid injection hole 112 and the electrode terminal 3 to reduce the probability of the spewing matter spewed from the liquid injection hole 112 spreading to contact the electrode terminal 3, but also the pressure relief mechanism 4 is arranged far away from the electrode terminal 3, which is conducive to reducing the probability of the spewing matter spewed from the pressure relief mechanism 4 spreading to contact the electrode terminal 3, and further reducing the risk of short circuit, and improving the performance of the battery and prolonging the life of the battery.

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

[0175] As shown in FIG. 7, the closest distance L1 between the pressure relief mechanism 4 and the liquid injection hole 112 along the length direction X of the first shell wall 11 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 shell wall 11.

[0176] For example, the closest distance L1 between the pressure relief mechanism 4 and the liquid injection hole 112 along the length direction X of the first shell wall 11 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 to reduce the mutual influence between the pressure relief mechanism 4 and the liquid injection hole 112, so as to ensure their respective functions.

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

[0179] As shown in FIG. 7, the closest distance L2 between the liquid injection hole 112 and the electrode terminal 3 closest to the liquid injection hole 112 in the length direction X of the first shell wall 11 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 shell wall 11.

[0180] For example, the closest distance L2 between the liquid injection hole 112 and the electrode terminal 3 closest to the liquid injection hole 112 in the length direction X of the first shell wall 11 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.

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

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

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

[0184] For example, the size L3 of the liquid injection hole 112 in the length direction X of the first shell wall 11 can be, but is not limited to, 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.

[0185] In this way, controlling the size L3 of the liquid injection hole 112 in the length direction X of the first shell wall 11 within an appropriate range can well ensure the liquid injection function of the liquid injection hole 112 without occupying too much space of the first shell wall 11.

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

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

[0188] For example, the closest distance L4 between the electrode terminal 3 closest to the barrier portion 5 and the barrier portion 5 can be, but is not limited to, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 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, 30 mm, 31 mm, or 32 mm.

[0189] In this way, by limiting the distance between the electrode terminal 3 and the barrier portion 5, the distance between the electrode terminal 3 and the pressure relief mechanism 4 is large enough, which further reduces the probability of the spray diffusing to contact the electrode terminal 3, thereby reducing the risk of short circuit, and further improving the performance of the battery and prolonging the service life of the battery.

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

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

[0192] In this way, by further limiting the distance between the electrode terminal 3 and the barrier portion 5, the distance between the electrode terminal 3 and the pressure relief mechanism 4 is controlled within an appropriate range, which better reduces the probability of the spray diffusing to contact the electrode terminal 3, thereby further reducing the risk of short circuit, and further improving the performance of the battery and prolonging the service life of the battery.

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

[0194] The distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 in the length direction X of the first housing wall 11 is not less than 5 mm, which means that the outer contour of the electrode terminal 3 is spaced apart from the edge of the first housing wall 11 by a distance of not less than 5 mm in the length direction X of the first housing wall 11. Exemplarily, as shown in FIG. 7, the left end of the leftmost electrode terminal 3 is spaced apart from the left end edge of the first housing wall 11 by a distance of not less than 5 mm.

[0195] The distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 in the length direction X of the first housing wall 11 is not less than 5 mm, which means that the outer contour of the electrode terminal 3 is spaced apart from the edge of the first housing wall 11 by a distance of not less than 5 mm in the length direction X of the first housing wall 11. Exemplarily, as shown in FIG. 7, the left end of the leftmost electrode terminal 3 is spaced apart from the left end edge of the first housing wall 11 by a distance of not less than 5 mm.

[0196] The distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 in the length direction X of the first housing wall 11 is not less than 5 mm, which means that the outer contour of the electrode terminal 3 is spaced apart from the edge of the first housing wall 11 by a distance of not less than 5 mm in the length direction X of the first housing wall 11. Exemplarily, as shown in FIG. 7, the left end of the leftmost electrode terminal 3 is spaced apart from the left end edge of the first housing wall 11 by a distance of not less than 5 mm.

[0197] The distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 in the length direction X of the first housing wall 11 is not less than 5 mm, which means that the outer contour of the electrode terminal 3 is spaced apart from the edge of the first housing wall 11 by a distance of not less than 5 mm in the length direction X of the first housing wall 11. Exemplarily, as shown in FIG. 7, the left end of the leftmost electrode terminal 3 is spaced apart from the left end edge of the first housing wall 11 by a distance of not less than 5 mm.

[0198] The distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 in the length direction X of the first housing wall 11 is not less than 5 mm, which means that the outer contour of the electrode terminal 3 is spaced apart from the edge of the first housing wall 11 by a distance of not less than 5 mm in the length direction X of the first housing wall 11. Exemplarily, as shown in FIG. 7, the left end of the leftmost electrode terminal 3 is spaced apart from the left end edge of the first housing wall 11 by a distance of not less than 5 mm.

[0199] The distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 in the length direction X of the first housing wall 11 is not less than 5 mm, which means that the outer contour of the electrode terminal 3 is spaced apart from the edge of the first housing wall 11 by a distance of not less than 5 mm in the length direction X of the first housing wall 11. Exemplarily, as shown in FIG. 7, the left end of the leftmost electrode terminal 3 is spaced apart from the left end edge of the first housing wall 11 by a distance of not less than 5 mm.

[0200] The distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 in the length direction X of the first housing wall 11 is not less than 5 mm, which means that the outer contour of the electrode terminal 3 is spaced apart from the edge of the first housing wall 11 by a distance of not less than 5 mm in the length direction X of the first housing wall 11. Exemplarily, as shown in FIG. 7, the left end of the leftmost electrode terminal 3 is spaced apart from the left end edge of the first housing wall 11 by a distance of not less than 5 mm.

[0201] The distance L5 between the electrode terminal 3 and the edge of the first housing wall 11 in the length direction X of the first housing wall 11 is not less than 5 mm, which means that the outer contour of the electrode terminal 3 is spaced apart from the edge of the first housing wall 11 by a distance of not less than 5 mm in the length direction X of the first housing wall 11. Exemplarily, as shown in FIG. 7, the left end of the leftmost electrode terminal 3 is spaced apart from the left end edge of the first housing wall 11 by a distance of not less than 5 mm.

[0202] In some embodiments of the present disclosure, as shown in FIG. 8, the dimension H1 of the barrier 5 protruding from the surface of the first housing wall 11 facing away from the accommodation cavity in the 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 barrier 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 in the wall thickness direction Z of the portion of the barrier portion 5 protruding from the outer surface of the first housing wall 11. Exemplarily, as shown in FIG. 8, the distance between the upper end surface of the barrier 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 barrier 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 barrier portion 5 protruding from the outer surface of the first housing wall 11 is limited to an appropriate range, so that the barrier portion 5 can play a role in blocking the diffusion of the spray, and the barrier 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 disclosure, the dimension H1 of the barrier 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 barrier portion 5 protruding from the outer surface of the first housing wall 11, the barrier portion 5 can better play a role in blocking the diffusion of the spray, and the barrier 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 disclosure, as shown in FIG. 8, the dimension H1 of the barrier 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 size H1 of the protruding part of the barrier portion 5 from the surface of the first housing wall 11 facing away from the accommodating cavity in the wall thickness direction Z of the first housing wall 11 is not less than the size H2 of the protruding part of the electrode terminal 3 from the surface of the first housing wall 11 facing away from the accommodating cavity in the wall thickness direction Z of the first housing wall 11, which means that the height of the protruding part of the barrier portion 5 from the outer surface of the first housing wall 11 is not less than the height of the protruding part of the electrode terminal 3 from the outer surface of the first housing wall 11. For example, as shown in FIG. 8, 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 barrier 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 spewed material to the electrode terminal 3, thereby reducing the risk of short circuit and further improving the performance and prolonging the life of the battery.

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

[0212] The barrier portion 5 is arranged between any one of the electrode terminals 3 and the pressure relief mechanism 4, so that the diffusion of the spewed material spewed from the pressure relief mechanism 4 towards any one of the electrode terminals 3 is blocked by the barrier portion 5, thereby more fully reducing the risk of short circuit and further improving the performance and prolonging the life of the battery.

[0213] In some embodiments of the present disclosure, 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] Arranging the electrode terminals 3 along the length direction X of the first housing wall 11 can make the size of the shell 1 in the width direction Y of the first housing wall 11 relatively small, which is convenient for the electrical connection between the electrode terminals 3 and the tabs 21 of the electrode assembly 2. Arranging the electrode terminals 3 along the width direction Y of the first housing wall 11 can make the size of the shell 1 in the length direction X of the first housing wall 11 relatively small, which is conducive to the electrical connection between the battery monomers 20.

[0215] In some embodiments of the present disclosure, as shown in FIGS. 6 and 9, the electrode terminal 3 comprises a terminal disc 31, which is arranged on the side of the first housing wall 11 facing the accommodating cavity and is used for electrical connection with the tab 21.

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

[0217] Since the electrode terminal 3 includes the terminal plate 31 located in the first housing wall 11 of the case 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 disclosure, as shown in FIGS. 9 and 12, the electrode terminal 3 further includes a terminal plate 32 disposed on the side of the first housing wall 11 facing away from the accommodation cavity, for electrical connection with the busbar 7, which can achieve electrical connection between the battery cells 20.

[0219] The terminal plate 32 can be made of metal, such as copper, aluminum, etc. Optionally, the terminal plate 32 is configured in a substantially flat plate shape. The shape of the flat plate can be designed according to the situation, for example, it can be circular, square as shown in FIG. 9, L-shaped as shown in FIG. 11, etc.

[0220] The electrode terminal 3 can improve the heat dissipation, the supporting effect on the first housing wall 11, and the connection strength with the busbar 7 by designing the terminal plate 32 to be larger, and the shape design freedom of the terminal plate 32 and the terminal plate 31 is higher. Moreover, the terminal plate 32 and the terminal plate 31 respectively clamp the first housing wall 11 from the inside and outside of the case 1, which can improve the bending strength of the first housing wall 11.

[0221] As shown in FIG. 9, the terminal plate 32 and the terminal plate 31 are connected through a connecting column 33 for connecting the terminal plate 32. There is no limitation on the shape, size or number of the connecting column 33, as long as the connection of the terminal plate 32 and the terminal plate 31 can be achieved. In a specific embodiment, the connecting column 33 is cylindrical.

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

[0223] In some embodiments, as shown in FIG. 9, the connecting column 33 is formed integrally with the terminal plate 31 and extends perpendicularly relative to the disc surface of the terminal plate 31. The terminal plate 32 is formed with a through hole, the connecting column 33 is inserted into the through hole and fixedly connected to the terminal plate 32. In this way, the electrode terminal 3 can be assembled to the first housing wall 11. In addition, a terminal seal can be further assembled between the connecting column 33 and the inner wall of the through hole of the terminal plate 32.

[0224] The terminal plate 32 and the terminal plate 31 are connected together through the connecting column 33, and the structure constitutes the electrode terminal 3 to play a role of leading out or introducing current from the electrode assembly 2.

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

[0226] The insulating structure 8 and the terminal plate 32 are fixed to each other in a manner such as one-piece injection molding, adhesion, fastening together by connecting posts, or the like.

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

[0228] As shown in FIG. 7, 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 a spacing of a left end of the first electrode terminal 3a and a right end of the second electrode terminal 3b along the length direction X is in a range of 25 mm to 100 mm.

[0229] For example, the maximum distance L7 of the outer contour of the first electrode terminal 3a and the outer contour of 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] In this way, by limiting the range of the maximum spacing of the outer contour of the first electrode terminal 3a and the outer contour of the second electrode terminal 3b, the space occupied by the first electrode terminal 3a and the second electrode terminal 3b along the length direction X of the first housing wall 11 is limited, and the spacing between the first electrode terminal 3a and the second electrode terminal 3b is appropriately made to electrically isolate the two.

[0231] In some embodiments of the present disclosure, as shown in FIG. 10 and FIG. 11, the 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 body part 321a and a first connecting part 322a connected to the first body part 321a, the second electrode terminal 3b includes a second body part 321b and a second connecting part 322b connected to the second body part 321b, the first body part 321a and the second body part 321b are arranged along the length direction X of the first housing wall 11, and projections of the first body part 321a and the second body part 321b along the length direction X at least partially overlap, the first connecting part 322a and the second connecting part 322b are arranged along the width direction Y of the first housing wall 11, and projections of the first connecting part 322a and the second connecting part 322b along the width direction Y at least partially overlap.

[0232] The first body part 321a and the second body part 321b can be configured in a rectangular shape, a circular shape, or the like. The first body part 321a and the second body part 321b can be configured in the same shape and / or size, or can be configured in different shapes and / or sizes.

[0233] The first connecting part 322a and the second connecting part 322b can be configured in a rectangular shape extending along the length direction X, or can be configured in a triangular shape tapering away from the first body part 321a. The specific shape of the first connecting part 322a and the second connecting part 322b is not particularly limited in the present disclosure. The second connecting part 322b can be configured in the same shape and / or size as the first connecting part 322a, or can be configured in a different shape and / or size from the first connecting part 322a.

[0234] Along the length direction X of the first shell wall 11, the first body part 321a is arranged on one side of the first connecting part 322a. The first body part 321a and the first connecting part 322a can be configured in an integral structure, or can be configured in a split structure. The first body part 321a and the first connecting part 322a are connected to each other and conductive. Along the length direction X of the first shell wall 11, the second body part 321b is arranged on the side of the second connecting part 322b away from the first body part 321a. The second body part 321b and the second connecting part 322b can be configured in an integral structure, or can be configured in a split structure. The second body part 321b and the second connecting part 322b are connected to each other and conductive.

[0235] The battery cell 20 in the embodiment of the present disclosure is arranged along the width direction Y of the first shell wall 11, and the projections along the width direction Y overlap each other. Therefore, the first electrode terminal 3a and the second electrode terminal 3b are arranged in a concentrated manner, which helps to share external forces and reduce the deformation degree, thereby improving the structural strength. As shown in FIG. 12, since the first connecting part 322a and the second connecting part 322b are used to connect the busbar 7, after the plurality of battery cells 20 are arranged along the width direction Y of the first shell wall 11, the first connecting part 322a and the second connecting part 322b of adjacent battery cells 20 are opposite to each other, which helps to shorten the connection path of the busbar 7. Since the first shell 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] Since the first connecting part 322a connects the first body part 321a, and the second connecting part 322b connects the second body part 321b, the force receiving area is increased, and the first electrode terminal 3a and the second electrode terminal 3b both have strong anti-deformation ability.

[0237] In some embodiments of the present disclosure, along the length direction X, the first connecting portion 322a is connected to the first main portion 321a on the side close to the second main portion 321b, and the second connecting portion 322b is connected to the second main portion 321b on the side close to the first main portion 321a, so that the first connecting portion 322a and the second connecting portion 322b are located between the first main portion 321a and the second main portion 321b. The first connecting portion 322a and the second connecting portion 322b are spaced apart by a distance to avoid conduction between the first electrode terminal 3a and the second electrode terminal 3b. Along the width direction Y, the projection of the first connecting portion 322a partially overlaps the second connecting portion 322b.

[0238] Since along the length direction X, the first connecting portion 322a and the second connecting portion 322b are located between the first main portion 321a and the second main portion 321b, and along the width direction Y, the first connecting portion 322a and the second connecting portion 322b have an overlap, the first connecting portion 322a and the second connecting portion 322b are close to each other and can share external forces together, which can withstand greater external forces and have stronger anti-deformation ability compared to separate forces.

[0239] As shown in FIG. 11, the first main portion 321a and the first connecting portion 322a are connected to form a first terminal plate 32a, the first main portion 321a of the first terminal plate 32a is connected with a first connecting column 33a, the first connecting column 33a penetrates through the first shell wall 11, and the first connecting column 33a is connected with a first terminal disc 31a at the end away from the first main portion 321a. The second main portion 321b and the second connecting portion 322b are connected to form a second terminal plate 32b, the second main portion 321b of the second terminal plate 32b is connected with a second connecting column 33b, the second connecting column 33b penetrates through the first shell wall 11, and the second connecting column 33b is connected with a second terminal disc 31b at the end away from the second main portion 321b.

[0240] As shown in FIG. 11, a first insulation structure 8a is arranged between the first terminal plate 32a and the first shell wall 11, and a second insulation structure 8b is arranged between the second terminal plate 32b and the first shell wall 11.

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

[0242] As shown in FIG. 7, 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. For example, 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 limiting 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, facilitating the arrangement of other components.

[0244] In some embodiments of the present disclosure, as shown in FIG. 10, the housing 1 further includes two housing walls opposite the first housing wall 11 along the wall thickness direction Z of the first housing wall 11, two housing walls opposite the length direction X of the first housing wall 11, and two housing walls opposite the width direction Y of the first housing wall 11. The size W1 of the housing 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 housing 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 housing 1 along the width direction Y of the first housing wall 11 is in the range of 20 mm to 80 mm.

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

[0246] Exemplarily, the dimension W1 of the housing 1 along the wall thickness direction Z of the first housing wall 11 can 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 housing 1 along the length direction X of the first housing wall 11 can 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 housing 1 along the width direction Y of the first housing wall 11 can 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 housing 1 forms a cuboid structure and defines the length, width, and height of the housing 1, so that the battery monomer 20 becomes a square cell, and defines the length, width, and height of the square cell, so that the battery monomer 20 is adapted to constitute the battery 100 for providing higher energy.

[0248] The second aspect of the present disclosure provides a battery 100 comprising at least one battery monomer 20 provided by the first aspect.

[0249] Since the battery 100 comprises the battery monomer 20 provided by the first aspect, the battery 100 comprises all the beneficial effects of the battery monomer 20, so that 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 disclosure, as shown in FIGS. 11 and 12, the battery 100 comprises at least two battery monomers 20 arranged along the width direction Y of the first housing wall 11, and adjacent battery monomers 20 are electrically connected by the tab 7.

[0251] In some embodiments of the present disclosure, as shown in FIG. 13, the battery 100 further comprises a battery box 10, and the battery monomer 20 is arranged in the battery box 10, and the surface of the barrier portion 5 of the battery monomer 20 facing away from the accommodating cavity abuts against the inner surface of the battery box 10.

[0252] The barrier portion 5 protrudes from the part of the outer shell 1 of the battery cell 20 and is made of an insulating material, so as to electrically isolate the battery case 10 and the outer shell 1 of the battery cell 20, and reduce the probability of short circuit of the battery 100.

[0253] The surface of the barrier portion 5 facing away from the accommodating cavity abuts against the inner surface of the battery case 10, so that the barrier portion 5 more tightly blocks the diffusion of the excretion, better plays a blocking role, and more greatly reduces the probability of the excretion diffusing to contact the electrode terminal 3, thereby reducing the risk of short circuit, and further improving the performance of the battery and prolonging the service life of the battery.

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

[0255] The barrier portion 5 protrudes from the part of the outer shell 1 of the battery cell 20 and is made of an insulating material, so as to improve the insulation performance between the tab 7 and the outer shell 1 of the battery cell 20, and reduce the probability of short circuit of the battery 100.

[0256] In this way, the barrier portion 5 occupies less space in the thickness direction Z of the first shell wall 11, and further improves the volumetric energy density of the battery cell 20.

[0257] The third aspect of the present disclosure provides an energy storage device, which includes a plurality of the battery cell 20 provided in the first aspect or the battery 100 provided in the second aspect, and the battery cell 20 or the battery 100 is used for storing and providing electrical energy.

[0258] Since the battery cell 20 provided in the first aspect or the battery 100 provided in the second aspect has high volumetric energy density, the space occupation in the energy storage device can be reduced or higher total energy can be stored in a limited space, and the probability of short circuit of the energy storage device is also reduced.

[0259] The fourth aspect of the present disclosure provides a power consumption device, which includes the battery cell 20 provided in the first aspect or the battery 100 provided in the second aspect for providing electrical energy.

[0260] Since the battery cell 20 provided in the first aspect or the battery 100 provided in the second aspect has high volumetric energy density, the space occupation in the power consumption device can be reduced or higher total energy can be stored in a limited space, and the probability of short circuit of the power consumption device is also reduced.

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

[0262] As a specific example, the battery cell 20 includes an end cover and an aluminum shell, and the end cover is composed of an end cover sheet (first shell wall 11), a lower plastic (insulating member 6), an upper plastic (insulating structure 8), a positive pole (a structure composed of a first terminal plate 31a and a first connecting pole 33a), a negative pole (a structure composed of a second terminal plate 31b and a second connecting pole 33b), a positive pole riveting block (a first terminal plate 32a), a negative pole riveting block (a second terminal plate 32b), an explosion-proof valve (pressure relief mechanism 4), a sealing ring, and an additional heat insulation plastic (barrier portion 5) in the middle. The explosion-proof valve is located at one end of the end cover in the length direction, and the two poles are located at the other end of the end cover in the length direction, and the heat insulation plastic is additionally added in the middle of the end cover for separation. When the explosion-proof valve sprays, due to the long distance and the heat insulation plastic in the middle, when high-temperature and high-pressure gas and liquid are sprayed out, the gas and liquid will be blocked by the heat insulation plastic in the middle, reducing the propagation distance, and because the distance is far, it is also more difficult to transmit to the pole area, greatly reducing the risk of battery cell 20 failure after the battery cell 20 sprays.

[0263] The various embodiments / implementation forms provided by the present disclosure can be combined with each other without producing contradictions.

[0264] The above is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. Industrial applicability

[0265] The present disclosure provides a battery cell, a battery, an energy storage device, and a power utilization device. In the battery cell, the pressure relief mechanism and the electrode terminal are both arranged on the first shell wall, reducing the occupation of the space in the accommodation cavity, thereby improving the volumetric energy density of the battery cell. Moreover, a barrier portion is arranged between the pressure relief mechanism and the electrode terminal, the barrier portion can block the spray from the pressure relief mechanism, reducing the probability of the spray spreading to contact the electrode terminal, thereby reducing the risk of short circuit, and further improving the performance of the battery and prolonging the service life of the battery. Therefore, the present disclosure has high volumetric energy density and low short circuit probability.

Claims

1. A battery cell, comprising: a housing having a receiving cavity, the housing comprising a first housing wall; an electrode assembly at least partially disposed in the receiving cavity; an electrode terminal disposed on the first housing wall and electrically connected to the electrode assembly; a pressure relief mechanism disposed on the first housing wall; and a barrier portion disposed on the first housing wall, at least a portion of the barrier portion protruding from a surface of the first housing wall facing away from the receiving cavity and located between the pressure relief mechanism and the electrode terminal; wherein a footprint of the electrode terminal falls within a footprint of the barrier portion in a projection plane perpendicular to a direction in which the pressure relief mechanism and the electrode terminal are arranged; wherein at least a portion of the barrier portion is made of an insulating material; wherein at least a portion of the barrier portion is made of a material having a melting point of 400℃ or higher; wherein at least a portion of the barrier portion is made of a ceramic material or a plastic material; wherein the barrier portion is entirely disposed on a side of the first housing wall facing away from the receiving cavity; wherein the barrier portion is welded to the first housing wall; wherein 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 receiving cavity, and the other end of the barrier portion extends in a direction facing away from the receiving cavity and protrudes from the surface of the first housing wall facing away from the receiving cavity; wherein the barrier portion is riveted to the first housing wall; wherein the first housing wall and the electrode assembly are provided with an insulating member, and the barrier portion is thermally fused to the insulating member; wherein 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; wherein the liquid injection hole is disposed between the barrier portion and the pressure relief mechanism; wherein a closest distance between the pressure relief mechanism and the liquid injection hole along a length direction of the first housing wall is not less than 20mm; wherein a closest distance between the liquid injection hole and the electrode terminal closest to the liquid injection hole along the length direction of the first housing wall is not less than 20mm; wherein a size of the liquid injection hole along the length direction of the first housing wall is in a range of 6mm to 20mm; wherein a closest distance between the electrode terminal closest to the barrier portion and the barrier portion is not less than 5mm; wherein a closest distance between the electrode terminal closest to the barrier portion and the barrier portion is in a range of 10mm to 20mm; wherein a distance between the electrode terminal and an edge of the first housing wall along the length direction of the first housing wall is not less than 5mm; wherein a closest distance between the pressure relief mechanism and the edge of the first housing wall along the length direction of the first housing wall is not less than 10mm; wherein a size of the barrier portion protruding from the surface of the first housing wall facing away from the receiving cavity along a thickness direction of the first housing wall is in a range of 4.7mm to 30mm; and wherein a size of the barrier portion protruding from the surface of the first housing wall facing away from the receiving cavity along the thickness direction of the first housing wall is in a range of 6mm to 15mm. ​ ​ ​ ​ ​ 2. The battery cell of claim 1, wherein, ​ 3. The battery cell of claim 1, wherein, ​ 4. The battery cell of any one of claims 1 to 3, wherein, ​ 5. The battery cell of any one of claims 1 to 4, wherein, ​ 6. The battery cell of any one of claims 1 to 5, wherein, ​ 7. The battery cell of claim 6, wherein, ​ 8. The battery cell of any one of claims 1 to 5, wherein, ​ 9. The battery cell of claim 8, wherein, ​ 10. The battery cell of claim 8, wherein, ​ 11. The battery cell of any one of claims 1 to 10, wherein, ​ 12. The battery cell of claim 11, wherein, ​ 13. The battery cell of claim 12, wherein, ​ 14. The battery cell of claim 12 or 13, wherein, ​ 15. The battery cell of any one of claims 11-14, wherein, ​ 16. The battery cell of any one of claims 1-15, wherein, ​ 17. The battery cell of claim 16, wherein, ​ 18. The battery cell of any one of claims 1-17, wherein, ​ 19. The battery cell of any one of claims 1-18, wherein, ​ 20. The battery cell of any one of claims 1-19, wherein, ​ 21. The battery cell of claim 20, wherein, ​ 22. The battery cell of any one of claims 1-21, wherein, A dimension of the barrier portion in a wall thickness direction of the first housing wall protruding from a surface of the first housing wall facing away from the accommodation cavity is not less than a dimension of the electrode terminal in the wall thickness direction of the first housing wall protruding from the surface of the first housing wall facing away from the accommodation cavity.

23. The battery cell of any one of claims 1-22, wherein, The electrode terminal is provided in at least two, and the barrier portion is provided between the pressure relief mechanism and each of the electrode terminals.

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

25. The battery cell of claim 23, wherein, The at least two electrode terminals include a first electrode terminal and a second electrode terminal, the first electrode terminal includes a first body portion and a first connecting portion connected to the first body portion, and the second electrode terminal includes a second body portion and a second connecting portion connected to the second body portion, The first body portion and the second body portion are arranged in a length direction of the first housing wall, and projections of the first body portion and the second body portion in the length direction at least partially overlap, The first connecting portion and the second connecting portion are arranged in a width direction of the first housing wall, and projections of the first connecting portion and the second connecting portion in the width direction at least partially overlap.

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

27. The battery cell of any one of claims 1-26, wherein, A dimension of the pressure relief mechanism in a length direction of the first housing wall is in a range of 30 mm to 150 mm.

28. The battery cell of any one of claims 1-27, wherein, The housing further includes a housing wall opposite to the first housing wall in a wall thickness direction of the first housing wall, two housing walls opposite to each other in a length direction of the first housing wall, and two housing walls opposite to each other in a width direction of the first housing wall, A dimension of the housing in the wall thickness direction of the first housing wall is in a range of 50 mm to 200 mm, a dimension of the housing in the length direction of the first housing wall is in a range of 200 mm to 450 mm, and a dimension of the housing in the width direction of the first housing wall is in a range of 20 mm to 80 mm.

29. A battery, comprising: At least one battery cell according to any one of claims 1 to 28.

30. The battery of claim 29, wherein, The battery further includes a sealed box, and the battery cell is provided in the sealed box, and a surface of the barrier portion of the battery cell facing away from the accommodation cavity abuts an inner surface of the sealed box.

31. The battery of claim 29, wherein, The electrode terminal of the battery cell is connected with a tab, and a distance between a surface of the barrier portion of the battery cell facing away from the accommodation cavity and the first housing wall is less than a distance between a surface of the tab facing away from the accommodation cavity and the first housing wall.

32. An energy storage device, comprising 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, the battery cells or the battery being used for storing electric energy and capable of providing electric energy.

33. An electric consumer comprising the battery cell of any one of claims 1 to 28 or the battery of any one of claims 29 to 31 for providing electrical energy.

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