Single battery, and battery device, energy storage device and power utilization device with single battery

Abstract

The utility model discloses a single battery and a battery device, an energy storage device and a power utilization device with the single battery, the single battery comprises a shell, the shell is provided with an accommodating cavity, the side wall of one side of the shell in a first direction is a first wall, the first wall is provided with an anti-explosion hole, the surface of one side of the first wall deviating from the accommodating cavity is provided with a bulge, and the bulge is provided with an anti-explosion hole; the protrusion extends in the circumferential direction of the anti-explosion hole to form a ring shape, a pressure relief hole is defined in the inner side of the protrusion, and the pressure relief hole communicates with the anti-explosion hole. And the pressure relief mechanism is mounted in the pressure relief hole. According to the single battery disclosed by the utility model, the through hole formed in the current collecting plate in the single battery can be arranged opposite to the explosion-proof hole, so that the single battery can be subjected to pressure relief operation more stably and reliably, and the probability of explosion-proof failure during thermal runaway of the single battery is well reduced; therefore, the single battery can pass the thermal runaway test more smoothly.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and a battery device, energy storage device and power consumption device having the same. Background Technology

[0002] The development of science and technology and the progress of society are often accompanied by the emergence and disappearance of problems. Many times, the implementation of a method solves one problem but leads to the emergence of another. People cannot always find a perfect solution that solves a problem while avoiding the creation of new problems. Problems always emerge after we take action. Therefore, the development of science and technology and the progress of society usually have to go through this imperfect process before they can have the opportunity to become more perfect. Problems always have to become more and more numerous before they can have the opportunity to become fewer and fewer.

[0003] Currently, battery cells are designed with openings in the current collector for pressure relief. This allows high-temperature gas to pass through the current collector and be ejected through the explosion-proof valve relatively stably and reliably in the event of thermal runaway, thereby reducing the risk of fire and explosion of the battery cells. However, when the openings and explosion-proof valves are arranged directly opposite each other, the tabs in the battery cells can easily pass through the openings and come into contact with the explosion-proof valve, potentially blocking it. This poses a significant risk of corrosion and leakage to the battery cells. Therefore, the openings in the current collector and the explosion-proof valves are generally staggered.

[0004] The staggered arrangement of the manifold openings and the explosion-proof valve means that in the event of thermal runaway in a battery cell, the high-temperature, high-pressure gas could force the manifold towards the explosion-proof valve, potentially blocking it. This also increases the flow path of the high-temperature, high-pressure gas from the manifold openings to the explosion-proof valve, increasing the risk of explosion and failure of the battery cell's thermal runaway test. Furthermore, during the electrolyte filling process, the electrolyte can contaminate the explosion-proof valve, causing corrosion and malfunction, further increasing the risk of explosion failure in the battery cell. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell that can significantly reduce the probability of explosion-proof failure during thermal runaway, enabling the battery cell to perform pressure relief operations more reliably and stably, and allowing the battery cell to pass thermal runaway tests more smoothly.

[0006] This utility model also proposes a battery device having the above-mentioned battery cells.

[0007] This utility model also proposes an energy storage device having the above-mentioned battery cell or battery device.

[0008] This utility model also proposes an electrical device having the above-mentioned battery cell, battery device, or energy storage device.

[0009] According to a first aspect of the present invention, a battery cell includes: a housing having a receiving cavity, a first wall having one side wall in a first direction, the first wall having an explosion-proof hole, a protrusion formed on the surface of the first wall opposite to the receiving cavity, the protrusion extending circumferentially along the explosion-proof hole in an annular shape and defining a pressure relief hole on its inner side, the pressure relief hole communicating with the explosion-proof hole; and a pressure relief mechanism installed in the pressure relief hole.

[0010] According to the present invention, the battery cell has a housing and a pressure relief mechanism. A protrusion is formed on the side of the first wall of the housing facing away from the receiving cavity. The protrusion extends circumferentially along the explosion-proof hole of the first wall into a ring and defines a pressure relief hole on the inner side. The pressure relief hole communicates with the explosion-proof hole. The pressure relief mechanism is installed in the pressure relief hole and is arranged away from the receiving cavity. This allows the through hole of the current collector in the battery cell to be arranged directly opposite the explosion-proof hole, thereby enabling the battery cell to perform pressure relief operations more stably and reliably. This significantly reduces the probability of explosion-proof failure when the battery cell experiences thermal runaway, allowing the battery cell to pass the thermal runaway test more smoothly.

[0011] In some embodiments of this utility model, in the first direction, the distance between the pressure relief mechanism and the surface of the first wall facing away from the receiving cavity is greater than or equal to 0.8 mm and less than or equal to 2.8 mm.

[0012] In this embodiment, the distance between the pressure relief mechanism and the surface of the first wall facing away from the receiving cavity is set to be greater than or equal to 0.8 mm and less than or equal to 2.8 mm. This ensures that there is sufficient distance between the pressure relief mechanism and the receiving cavity, allowing the battery cell to be reliably and stably depressurized without explosion. It also makes the size of the protrusion along the first direction smaller, allowing the battery cell to be easily assembled later.

[0013] In some embodiments of this utility model, in the first direction, the height of the protrusion is greater than or equal to 1 mm and less than or equal to 3 mm.

[0014] In this embodiment, the height of the protrusion in the first direction is set to be greater than or equal to 1 mm and less than or equal to 3 mm, which can well meet the installation and arrangement requirements of the pressure relief mechanism, so that the pressure relief mechanism can be stably installed in the pressure relief hole, and the protrusion can have a small height dimension, so that the protrusion can have little interference or influence on the assembly operations such as electrical connection of the battery cell, thereby making the battery cell more convenient to assemble.

[0015] In some embodiments of this utility model, the battery cell further includes: an electrode assembly disposed within the receiving cavity; a terminal post and a conductive terminal, wherein the terminal post extends along the first direction and passes through the first wall, the conductive terminal is disposed on the side of the first wall opposite to the receiving cavity, and the terminal post is connected between the conductive terminal and the electrode assembly.

[0016] In this embodiment, the battery cell includes an electrode assembly, a terminal post, and a conductive terminal. The structure is simple and can meet the operation and use needs of the battery cell. The electrode assembly is set in the receiving cavity, so that the shell can provide good protection for the electrode assembly. The terminal post extends along the first direction and passes through the first wall. The structure is simple and facilitates the connection between the terminal post and the electrode assembly, meeting the use needs of the battery cell. The conductive terminal is set on the side of the first wall away from the receiving cavity. The terminal post connects between the conductive terminal and the electrode assembly, which facilitates the fixing of the terminal post and gives the battery cell a larger connection mating surface during electrical connection, making the battery cell assembly more convenient.

[0017] In one embodiment of this utility model, in the first direction, the height dimension of the protrusion is set as a first spacing, and the spacing between the end face of the conductive terminal away from the first wall and the side surface of the first wall away from the receiving cavity is set as a second spacing, wherein the first spacing is less than or equal to the second spacing.

[0018] In this embodiment, the first spacing is set to be less than or equal to the second spacing, so that the protrusion does not extend beyond the end face of the conductive terminal away from the receiving cavity in the first direction. This reduces the obstruction and interference caused by the protrusion to the connection between the conductive terminal and the copper busbar and other structures when the battery cells are assembled and connected. This makes it easier to assemble the battery cells and allows the arrangement of multiple battery cells to remain compact when multiple battery cells are assembled in groups, thereby reducing the impact on the energy sealing of the battery device to a certain extent.

[0019] In some examples of this utility model, the ratio of the first spacing to the second spacing is greater than or equal to 0.3 and less than or equal to 1.

[0020] In this embodiment, the ratio of the first spacing to the second spacing is set to be greater than or equal to 0.3 and less than or equal to 1, so that the protrusion can have sufficient height to match the installation arrangement of the pressure relief mechanism, and the protrusion is located between the end face of the conductive terminal away from the receiving cavity and the side surface of the first wall away from the receiving cavity, so that the battery cell can be easily assembled and used in the future.

[0021] In some embodiments of this utility model, the battery cell further includes: an electrode assembly and a current collector, both of which are disposed within the receiving cavity. The current collector is disposed on the side of the electrode assembly facing the first wall in the first direction. The current collector is connected to the tab of the electrode assembly. The current collector has a through hole, which is arranged along the first direction toward the explosion-proof hole.

[0022] In this embodiment, the battery cell is equipped with an electrode assembly and a current collector. Both the electrode assembly and the current collector are located inside the receiving cavity. The through hole of the current collector faces the explosion-proof hole. The structure is simple and easy to assemble, which can well meet the needs of the battery cell in use and operation, and enable the battery cell to release pressure stably and reliably.

[0023] In some embodiments of this utility model, the housing includes a main shell and an end cap. The main shell extends along the first direction and is open at one end in the first direction. The end cap is disposed on the open end of the main shell and is formed as the first wall.

[0024] In this embodiment, the housing includes a main housing and an end cap. The end cap is located on the open end of the main housing and forms the first wall. The structure is simple, making it convenient and easy to assemble the battery cells.

[0025] In some embodiments of this utility model, the battery cell is a cylindrical battery.

[0026] In this embodiment, the battery cell is a cylindrical battery, which can significantly reduce the probability of explosion failure and allow the cylindrical battery to pass the thermal runaway test more smoothly, making the battery cell in this embodiment more practical.

[0027] The battery device according to the second aspect of the present invention includes a battery cell according to the first aspect of the present invention.

[0028] According to the battery device of this utility model, by setting the battery cell of the first aspect above, by setting the housing and the pressure relief mechanism, a protrusion is formed on the side surface of the first wall of the housing away from the receiving cavity. The protrusion extends in a ring along the circumference of the explosion-proof hole of the first wall and defines a pressure relief hole on the inner side. The pressure relief hole communicates with the explosion-proof hole. The pressure relief mechanism is installed in the pressure relief hole and arranged away from the receiving cavity, so that the through hole of the current collector in the battery cell can be arranged directly opposite the explosion-proof hole. This allows the battery cell to perform pressure relief operation more stably and reliably, greatly reducing the probability of explosion-proof failure when the battery cell experiences thermal runaway, and thus allowing the battery cell to pass the thermal runaway test more smoothly.

[0029] An energy storage device according to a third aspect of the present invention includes a battery cell according to a first aspect of the present invention or a battery device according to a second aspect of the present invention, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0030] According to the energy storage device of this utility model, by setting the battery cell of the first aspect or the battery device of the second aspect, by setting the housing and the pressure relief mechanism, a protrusion is formed on the side surface of the first wall of the housing away from the receiving cavity. The protrusion extends in a ring along the circumference of the explosion-proof hole of the first wall and defines a pressure relief hole on the inner side. The pressure relief hole communicates with the explosion-proof hole. The pressure relief mechanism is installed in the pressure relief hole and arranged away from the receiving cavity, so that the through hole of the current collector in the battery cell can be arranged directly opposite the explosion-proof hole. This allows the battery cell to perform pressure relief operation more stably and reliably, greatly reducing the probability of explosion-proof failure when the battery cell experiences thermal runaway, and thus allowing the battery cell to pass the thermal runaway test more smoothly.

[0031] An electrical device according to a fourth aspect of the present invention includes a battery cell according to a first aspect of the present invention, a battery device according to a second aspect of the present invention, or an energy storage device according to a third aspect of the present invention, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0032] According to the present invention, the electrical device comprises a battery cell of the first aspect, a battery device of the second aspect, or an energy storage device of the third aspect, and a housing and a pressure relief mechanism. A protrusion is formed on the surface of the first wall of the housing away from the receiving cavity. The protrusion extends circumferentially along the explosion-proof hole of the first wall into a ring and defines a pressure relief hole on the inner side. The pressure relief hole communicates with the explosion-proof hole. The pressure relief mechanism is installed in the pressure relief hole and arranged away from the receiving cavity. This allows the through hole of the current collector in the battery cell to be arranged directly opposite the explosion-proof hole, thereby enabling the battery cell to perform pressure relief operations more stably and reliably. This significantly reduces the probability of explosion-proof failure when the battery cell experiences thermal runaway, allowing the battery cell to pass the thermal runaway test more smoothly.

[0033] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of an electrical device according to an embodiment of the present utility model;

[0035] Figure 2 This is a schematic diagram of a battery device according to an embodiment of the present utility model;

[0036] Figure 3This is an exploded view of a battery cell according to an embodiment of the present utility model;

[0037] Figure 4 This is a schematic diagram of an explosion of a battery cell at the first wall according to an embodiment of the present invention;

[0038] Figure 5 This is a cross-sectional view of a battery cell at the first wall according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the first wall according to an embodiment of the present utility model.

[0040] Figure label:

[0041] 10. Battery cells;

[0042] 11. Shell; 111. Main shell;

[0043] 112. First wall; 1121. Protrusion; 1101. Pressure relief hole; 1102. Explosion-proof hole;

[0044] 113. The second wall;

[0045] 12. Pressure relief mechanism; 121. Protruding explosion-proof valve; 122. Valve plate;

[0046] 13. Conductive terminal; 14. Current collector; 141. Through hole;

[0047] 15. Terminal post; 16. Adapter plate; 17. Electrode assembly; 18. Upper plastic; 19. Lower plastic;

[0048] 100. Battery assembly; 200. Motor; 300. Controller;

[0049] 1000. Electrical appliances. Detailed Implementation

[0050] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0051] 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 invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of this utility model, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly defined.

[0053] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments of this utility model, the term "multiple" refers to two or more (including two).

[0055] In the description of the embodiments of this utility model, the technical terms "thickness", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0056] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0057] Currently, battery cells are designed with openings in the current collector for pressure relief. This allows high-temperature gas to pass through the current collector and be ejected through the explosion-proof valve relatively stably and reliably in the event of thermal runaway, thereby reducing the risk of fire and explosion of the battery cell. However, when the openings and the explosion-proof valve are arranged directly opposite each other, the tabs in the battery cell can easily pass through the openings and come into contact with the explosion-proof valve, potentially blocking it. This poses a significant risk of corrosion and leakage to the battery cell. Therefore, the openings in the current collector and the explosion-proof valve are generally staggered.

[0058] The staggered arrangement of the manifold openings and the explosion-proof valve means that in the event of thermal runaway in a battery cell, the high-temperature, high-pressure gas could force the manifold towards the explosion-proof valve, potentially blocking it. This also increases the flow path of the high-temperature, high-pressure gas from the manifold openings to the explosion-proof valve, increasing the risk of explosion and failure of the battery cell's thermal runaway test. Furthermore, during the electrolyte filling process, the electrolyte can contaminate the explosion-proof valve, causing corrosion and malfunction, further increasing the risk of explosion failure in the battery cell.

[0059] Based on the above considerations, in order to reduce the risk of explosion-proof failure of individual battery cells, ensure stable and reliable explosion-proof operation of individual battery cells, and enable individual battery cells to pass thermal runaway tests more smoothly, this utility model sets a protrusion on the individual battery cell, and arranges the explosion-proof valve in the pressure relief hole of the protrusion. This increases the distance between the explosion-proof valve and the current collector and electrode assembly in the individual battery cell, so that the opening of the current collector is directly opposite the explosion-proof valve, greatly reducing the probability of the electrode tab blocking the explosion-proof valve. This allows the opening of the current collector to be directly opposite the explosion-proof valve, thereby greatly reducing the probability of explosion-proof valve failure and enabling the individual battery cell to pass thermal runaway tests smoothly.

[0060] The battery cell disclosed in this embodiment can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, nano-metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc. The battery cell disclosed in this embodiment can be used in electrical devices that use the battery cell as a power source or in various battery devices or energy storage systems that use the battery cell as an energy storage element.

[0061] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0062] For example, when the electrical device is a vehicle, the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle's interior contains a battery pack comprising multiple individual battery cells, which can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the power supply from the battery pack to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving.

[0063] In some embodiments of this utility model, the battery device can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0064] In this invention, a battery device refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this invention may include a battery module or battery pack. Some battery devices may include a housing for encapsulating one or more battery cells or multiple battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells. Of course, some battery devices may not include the aforementioned housing and may be directly installed within the battery mounting compartment of the electrical device.

[0065] The following is for reference. Figures 1-6 The battery cell 10 according to the first aspect of the present invention is described. Figure 1 This is a schematic diagram of an electrical device 1000 according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of a battery device 100 according to an embodiment of the present utility model; Figure 3 This is an exploded view of the battery cell 10 according to an embodiment of the present invention; Figure 4 This is a schematic diagram of an explosion of a battery cell 10 at the first wall 112 according to an embodiment of the present invention; Figure 5 This is a cross-sectional view of the battery cell 10 at the first wall 112 according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the first wall 112 according to an embodiment of the present utility model.

[0066] like Figures 1-6 As shown, the battery cell 10 according to a first aspect embodiment of the present invention includes: a housing 11 and a pressure relief mechanism 12. The housing 11 has a receiving cavity, and the housing 11 is positioned in a first direction (e.g., Figure 3The side wall on the z-direction shown is the first wall 112. The first wall 112 is provided with an explosion-proof hole 1102. A protrusion 1121 is formed on the side surface of the first wall 112 away from the receiving cavity. The protrusion 1121 extends in a ring along the circumference of the explosion-proof hole 1102 and defines a pressure relief hole 1101 on the inner side. The pressure relief hole 1101 is connected to the explosion-proof hole 1102. The pressure relief mechanism 12 is installed in the pressure relief hole 1101.

[0067] In this embodiment, the battery cell 10 includes a housing 11, which has a receiving cavity. One side wall of the housing 11 in a first direction is a first wall 112. The housing 11 can be composed of multiple components to form a sealed receiving cavity. For example, the housing 11 can be composed of a hollow member extending along the first direction and two closure members at both ends of the hollow member. The hollow member and the two closure members can be separate components and combined into the housing 11 by mechanical connection. The hollow member can also be integrated with one of the closure members, and the other closure member is closed at the other end of the hollow member. The closure member is formed as the first wall 112.

[0068] The housing 11 can have various shapes and sizes, such as a cylinder, a hexagonal prism, etc. The shape and size of the housing 11 can be determined according to the specific shape and size of the electrode assembly 17 of the battery cell 10. The housing 11 can also be made of various materials, such as metal, plastic, or composite materials. For example, the housing 11 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0069] In this embodiment, an explosion-proof hole 1102 is provided in the first wall 112. A protrusion 1121 is formed on the side of the first wall 112 away from the receiving cavity. The protrusion 1121 extends in a ring shape along the circumference of the explosion-proof hole 1102 and defines a pressure relief hole 1101 on the inner side. That is, the protrusion 1121 is formed on the outer surface of the housing 11 in the first direction. The protrusion 1121 forms a pressure relief hole 1101 that communicates with the explosion-proof hole 1102. The pressure relief hole 1101 is arranged away from the receiving cavity in the first direction. In this embodiment, the pressure relief mechanism 12 is installed in the pressure relief hole 1101. When the battery cell 10 experiences thermal runaway, the high-temperature and high-pressure gas in the receiving cavity flows into the explosion-proof hole 1102 through the through hole 141 opened in the collector plate 14, thereby flowing out of the receiving cavity and into the pressure relief hole 1101. The high-temperature and high-pressure gas impacts the pressure relief mechanism 12. After the pressure relief mechanism 12 withstands a certain explosion-proof pressure, it opens to release pressure, allowing the high-temperature and high-pressure gas to flow out of the battery cell 10. The protrusion 1121 extends in a ring shape along the circumference of the explosion-proof hole 1102. For example, the cross-section of the protrusion 1121 perpendicular to the first direction can be a ring-shaped surface such as a circle, ellipse, or rectangle. Optionally, the protrusion 1121 can extend in a ring shape along the circumference of the explosion-proof hole 1102.

[0070] The pressure relief mechanism 12 can be configured in various forms as needed. For example, the pressure relief mechanism 12 can be composed of a raised explosion-proof valve 121 and a valve plate 122. The valve plate 122 is located at the raised part 1121 of the raised explosion-proof valve 121. The raised explosion-proof valve 121 and the valve plate 122 cooperate to open and relieve pressure under a certain explosion-proof pressure.

[0071] In this embodiment, a protrusion 1121 is formed on the side of the first wall 112 away from the receiving cavity. The protrusion 1121 defines a pressure relief hole 1101 communicating with the explosion-proof hole 1102 on its inner side. The pressure relief mechanism 12 is installed in the pressure relief hole 1101, so that the pressure relief mechanism 12 can be arranged away from the receiving cavity. Thus, when the through hole 141 of the current collector 14 is arranged opposite to the explosion-proof hole 1102 in the first direction, when the electrode tab of the electrode assembly 17 extends from the through hole 141 toward the explosion-proof hole 1102, there can be a large gap between the pressure relief mechanism 12 and the electrode tab. This can effectively reduce the probability of the electrode tab contacting the pressure relief mechanism 12 and blocking the pressure relief hole 1101, and at the same time reduce the risk of corrosion failure of the pressure relief mechanism 12 and leakage of the battery cell 10 caused by the electrode tab contacting the pressure relief mechanism 12.

[0072] Therefore, when the current collector 14, explosion-proof hole 1102, and pressure relief hole 1101 in the battery cell 10 are assembled, the through hole 141 of the current collector 14 can be arranged directly opposite the explosion-proof hole 1102 in the first direction, provided that the pressure relief mechanism 12 operates stably and the battery cell 10 maintains a stable structural state. This greatly reduces the probability that the current collector 14 will block the explosion-proof hole 1102 under the action of high-temperature and high-pressure gas when the battery cell 10 experiences thermal runaway. The high-temperature and high-pressure gas can flow stably, reliably, and quickly from the through hole 141 to the pressure relief mechanism 12 for pressure relief, thereby enabling the battery cell 10 to perform pressure relief operations more stably and reliably. This significantly reduces the probability that the battery cell 10 will fail to prevent explosion during thermal runaway, allowing the battery cell 10 to pass the thermal runaway test more smoothly.

[0073] During the electrolyte injection process of the battery cell 10, since the pressure relief mechanism 12 is arranged in the pressure relief hole 1101 far away from the receiving cavity, the distance between the injected electrolyte and the pressure relief mechanism 12 is greater, thereby reducing the probability of corrosion failure of the pressure relief mechanism 12 due to contact with the electrolyte, and thus further reducing the risk of explosion failure of the battery cell 10.

[0074] According to the embodiment of the present invention, the battery cell 10 is provided with a housing 11 and a pressure relief mechanism 12. A protrusion 1121 is formed on the side surface of the first wall 112 of the housing 11 that is away from the receiving cavity. The protrusion 1121 extends circumferentially along the explosion-proof hole 1102 of the first wall 112 and defines a pressure relief hole 1101 on the inner side. The pressure relief hole 1101 communicates with the explosion-proof hole 1102. The pressure relief mechanism 12 is installed in the pressure relief hole 1101 and arranged away from the receiving cavity. This allows the through hole 141 of the current collector 14 in the battery cell 10 to be arranged directly opposite the explosion-proof hole 1102. This allows the battery cell 10 to perform pressure relief operations more stably and reliably, greatly reducing the probability of explosion-proof failure when the battery cell 10 experiences thermal runaway. This allows the battery cell 10 to pass the thermal runaway test more smoothly.

[0075] In some embodiments of this utility model, in the first direction, the distance between the pressure relief mechanism 12 and the surface of the first wall 112 facing away from the receiving cavity can be greater than or equal to 0.8 mm and less than or equal to 2.8 mm.

[0076] In this embodiment, the distance between the pressure relief mechanism 12 and the surface of the first wall 112 facing away from the receiving cavity is set to be greater than or equal to 0.8 mm and less than or equal to 2.8 mm, for example, referring to... Figure 5 As shown in the figure, d1 represents the distance between the pressure relief mechanism 12 and the surface of the first wall 112 facing away from the receiving cavity. The distance d1 can be 0.8mm, 0.9mm, 1mm, 1.5mm, 1.7mm, 2.5mm, 2.8mm, etc.

[0077] In this embodiment, the distance between the pressure relief mechanism 12 and the surface of the first wall 112 facing away from the receiving cavity is set to be greater than or equal to 0.8 mm, so that there is a sufficient distance between the pressure relief mechanism 12 and the receiving cavity, thereby reliably reducing the probability of electrolyte contacting the pressure relief mechanism 12 and the tab contacting the sealing pressure relief mechanism 12, so that the pressure relief mechanism 12 can operate stably and reliably when the battery cell 10 is thermally runaway, and the battery cell 10 can perform explosion-proof pressure relief operations stably and reliably.

[0078] In this embodiment, the distance between the pressure relief mechanism 12 and the surface of the first wall 112 facing away from the receiving cavity is set to less than or equal to 2.8 mm. This allows the protrusion 1121, which is used to install the pressure relief mechanism 12, to be kept within a certain size range along the first direction, reducing the interference and influence of the protrusion 1121 on the battery cell 10 during electrical connection and assembly, so that the battery cell 10 can be easily and conveniently assembled later.

[0079] In this embodiment, the distance between the pressure relief mechanism 12 and the surface of the first wall 112 facing away from the receiving cavity is set to be greater than or equal to 0.8 mm and less than or equal to 2.8 mm, so that there is a sufficient distance between the pressure relief mechanism 12 and the receiving cavity, so that the battery cell 10 can be reliably and stably depressurized without explosion, and the size of the protrusion 1121 along the first direction is small, so that the battery cell 10 can be easily assembled later.

[0080] In some embodiments of this utility model, in the first direction, the height of the protrusion 1121 can be greater than or equal to 1 mm and less than or equal to 3 mm.

[0081] In this embodiment, the height of the protrusion 1121 in the first direction is set to be greater than or equal to 1 mm and less than or equal to 3 mm, for example... Figure 5 As shown in the figure, d2 represents the height dimension of the protrusion 1121 in the first direction. d2 can be 1mm, 1.2mm, 1.4mm, 1.5mm, 2mm, 2.3mm, 2.7mm, 3mm, etc.

[0082] In this embodiment, the height of the protrusion 1121 in the first direction is set to be greater than or equal to 1 mm and less than or equal to 3 mm, which can well meet the installation and arrangement requirements of the pressure relief mechanism 12, so that the pressure relief mechanism 12 can be stably installed in the pressure relief hole 1101, and the protrusion 1121 can have a small height dimension, so that the interference or influence of the protrusion 1121 on the assembly operations such as electrical connection of the battery cell 10 can be minimized, thereby making the assembly of the battery cell 10 more convenient.

[0083] In some embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the battery cell 10 may further include: an electrode assembly 17, a terminal post 15, and a conductive terminal 13. The electrode assembly 17 is disposed in the receiving cavity; the terminal post 15 extends along a first direction and passes through the first wall 112, and the conductive terminal 13 is disposed on the side of the first wall 112 away from the receiving cavity. The terminal post 15 is connected between the conductive terminal 13 and the electrode assembly 17.

[0084] In this embodiment, the battery cell 10 includes an electrode assembly 17, a terminal post 15, and a conductive terminal 13. The electrode assembly 17 may consist of a positive electrode, a negative electrode, and a separator. The battery cell 10 mainly operates by the movement of metal ions between the positive and negative electrode. The positive electrode may include a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0085] The negative electrode sheet may include a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. The separator material can be PP (polypropylene) or PE (polyethylene), etc.

[0086] The terminal 15 is used for the electrical energy input and output of the battery cell 10. The terminal 15 is connected to the tab of the electrode assembly 17. The terminal 15 and the tab can be electrically connected to the current collector 14 through the adapter 16. When the terminal 15 is connected to the positive tab of the electrode assembly 17, the terminal 15 is formed as a positive terminal 15. When the terminal 15 is connected to the negative tab of the electrode assembly 17, the terminal 15 is formed as a negative terminal 15. There can be multiple terminals 15. Multiple terminals 15 can be connected to tabs of the same polarity to increase the current flow area. For example, in a cylindrical battery, there can be two terminals 15. The two terminals 15 are connected to the positive tab of the electrode assembly 17 through the adapter 16 and the current collector 14. The two terminals 15 are then connected to the conductive terminal 13. The conductive terminal 13 and the terminal 15 can be connected and fixed by riveting. When assembling the battery cell 10, multiple battery cells 10 can be electrically connected to the conductive terminal 13 through copper busbars or the like.

[0087] In this embodiment, the battery cell 10 includes an electrode assembly 17, a terminal post 15, and a conductive terminal 13. The structure is simple and meets the operational and usage requirements of the battery cell 10. The electrode assembly 17 is disposed within the receiving cavity, allowing the housing 11 to provide good protection for the electrode assembly 17. The terminal post 15 extends along a first direction and passes through the first wall 112. Its simple structure facilitates the connection between the terminal post 15 and the electrode assembly 17, meeting the usage requirements of the battery cell 10. The conductive terminal 13 is disposed on the side of the first wall 112 opposite to the receiving cavity. The terminal post 15 connects the conductive terminal 13 and the electrode assembly 17, facilitating the fixation of the terminal post 15 and providing a larger connection mating surface for the battery cell 10 during electrical connection, making the assembly of the battery cell 10 more convenient.

[0088] In one embodiment of the present invention, in a first direction, the height dimension of the protrusion 1121 is set as a first spacing, and the spacing between the end face of the conductive terminal 13 away from the first wall 112 and the side surface of the first wall 112 away from the receiving cavity is set as a second spacing. The first spacing may be less than or equal to the second spacing.

[0089] In this embodiment, the height of the protrusion 1121 is set as the first spacing, and the spacing between the end face of the conductive terminal 13 away from the first wall 112 and the side surface of the first wall 112 away from the receiving cavity is set as the second spacing. The first spacing is less than or equal to the second spacing. That is, in the first direction, the end face of the conductive terminal 13 away from the receiving cavity can be away from the receiving cavity and extend beyond the end face of the protrusion 1121 away from the receiving cavity, or the end face of the conductive terminal 13 away from the receiving cavity is flush with the end face of the protrusion 1121 away from the receiving cavity.

[0090] In this embodiment, the first spacing is set to be less than or equal to the second spacing, so that the protrusion 1121 does not extend beyond the end face of the conductive terminal 13 away from the receiving cavity in the first direction. This reduces the obstruction and interference caused by the protrusion 1121 to the connection between the conductive terminal 13 and the copper busbar and other structures when the battery cell 10 is assembled and connected. This makes it easier to assemble the battery cell 10, and when multiple battery cells 10 are assembled in groups, the arrangement of the multiple battery cells 10 can be kept compact, thereby reducing the impact on the energy sealing of the battery device 100 to a certain extent.

[0091] In some examples of this utility model, the ratio of the first spacing to the second spacing can be greater than or equal to 0.3 and less than or equal to 1.

[0092] In this embodiment, the ratio of the first spacing to the second spacing is greater than or equal to 0.3 and less than or equal to 1, for example... Figure 5As shown in the figure, d2 represents the first spacing and d3 represents the second spacing. The ratio of d2 to d3 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.

[0093] In this embodiment, the ratio of the first spacing to the second spacing is set to be greater than or equal to 0.3 and less than or equal to 1, so that the protrusion 1121 can have sufficient height to match the installation arrangement of the pressure relief mechanism 12, and the protrusion 1121 is located between the end face of the conductive terminal 13 away from the receiving cavity and the side surface of the first wall 112 away from the receiving cavity, so that the battery cell 10 can be conveniently assembled and used in the future.

[0094] In some embodiments of this utility model, such as Figure 4 and Figure 5 As shown, the battery cell 10 may further include: an electrode assembly 17 and a current collector 14. The electrode assembly 17 and the current collector 14 are both disposed in the receiving cavity. The current collector 14 is disposed on the side of the electrode assembly 17 facing the first wall 112 in the first direction. The current collector 14 is connected to the tab of the electrode assembly 17. The current collector 14 is provided with a through hole 141, which is arranged along the first direction toward the explosion-proof hole 1102.

[0095] In this embodiment, the battery cell 10 includes an electrode assembly 17 and a current collector 14. The current collector 14 is disposed on the side of the electrode assembly 17 facing the first wall 112. For example, the positive electrode tab of the electrode assembly 17 can be arranged facing the first wall 112 so that the current collector 14 can be easily connected to the positive electrode tab. A thermally conductive and insulating colloid can be coated between the electrode assembly 17 and the inner wall of the housing 11, and between the electrode tab and the inner wall of the housing 11. The current collector 14 and the terminal post 15 can be connected by an adapter piece 16.

[0096] In this embodiment, the battery cell 10 is provided with an electrode assembly 17 and a current collector 14. The structure is simple and can well meet the assembly and use needs of the battery cell 10. The current collector 14 is located on the side of the electrode assembly 17 facing the first wall 112, which can facilitate the connection between the electrode assembly 17 and the terminal post 15.

[0097] The through hole 141 on the collector plate 14 is arranged facing the explosion-proof hole 1102, so that when the battery cell 10 experiences thermal runaway, the high-temperature and high-pressure gas can flow directly and quickly from the through hole 141 to the explosion-proof hole 1102, allowing the battery cell 10 to be reliably depressurized. This also significantly reduces the probability that the collector plate 14 or the adapter plate 16 will block the explosion-proof hole 1102 or obstruct the gas venting channel. Especially when the collector plate 14 is a thin copper component with low strength, the through hole 141 and the explosion-proof hole 1102 are arranged directly opposite each other along the first direction, greatly reducing the probability that the collector plate 14 will block the explosion-proof hole 1102 after deformation. This allows the pressure relief mechanism 12 to perform pressure relief operations stably, and the battery cell 10 to be depressurized stably and reliably, thereby significantly reducing the risk of the battery cell 10 catching fire and exploding, and making the operation of the battery cell 10 more stable and reliable.

[0098] In this embodiment, the battery cell 10 is provided with an electrode assembly 17 and a current collector 14. Both the electrode assembly 17 and the current collector 14 are located in the receiving cavity. The through hole 141 of the current collector 14 is arranged facing the explosion-proof hole 1102. The structure is simple and easy to assemble, which can well meet the use and operation needs of the battery cell 10, and enable the battery cell 10 to depressurize stably and reliably.

[0099] In some embodiments of this utility model, the burst pressure of the pressure relief mechanism 12 can be greater than or equal to 1.9 MPa and less than or equal to 2.5 MPa.

[0100] In this embodiment, the burst pressure of the pressure relief mechanism 12 is set to be greater than or equal to 1.9 MPa and less than or equal to 2.5 MPa. For example, the burst pressure of the pressure relief mechanism 12 can be 1.9 MPa, 2 MPa, 2.1 MPa, 2.3 MPa, 2.5 MPa, etc.

[0101] In this embodiment, the burst pressure of the pressure relief mechanism 12 is set to be greater than or equal to 1.9 MPa, so that the pressure relief mechanism 12 can play a stable and reliable sealing role at the explosion-proof hole 1102 of the accommodating cavity when the battery cell 10 is operating normally. The burst pressure is set to be less than or equal to 2.5 MPa, so that the burst pressure of the pressure relief mechanism 12 is within a small range, so that the pressure relief mechanism 12 can be opened stably and reliably to release high-temperature and high-pressure gas when the battery cell 10 experiences thermal runaway.

[0102] In some embodiments of this utility model, such as Figure 3 As shown, the housing 11 may include a main housing 111 and an end cap. The main housing 111 extends along a first direction and is open at one end in the first direction. The end cap is disposed on the open end of the main housing 111 and is formed as a first wall 112.

[0103] In this embodiment, the housing 11 includes a main housing 111 and an end cap. The main housing 111 is open at one end in a first direction. For example, the main housing 111 may be open at one end, or both ends of the main housing 111 may be open in the first direction. The end cap is disposed on the open side of the main housing 111 and is formed as a first wall 112. The shape of the end cap may be adapted to the shape of the main housing 111 to fit the main housing 111. Optionally, the end cap may be made of a material with a certain hardness and strength, such as an aluminum alloy, so that the end cap is not easily deformed and the battery cell 10 has a stable structural state.

[0104] An insulating element may be provided on the side of the end cap facing the receiving cavity to isolate electrical connection components such as the current collector 14 inside the receiving cavity, thereby reducing the risk of short circuit. For example, a lower plastic 19 may be provided on the side of the end cap facing the receiving cavity. The lower plastic 19 may be a plastic part, a rubber part, etc.

[0105] In this embodiment, the housing 11 includes a main housing 111 and an end cap. The end cap is disposed on the open end of the main housing 111 and forms a first wall 112. The structure is simple, making it convenient and easy to assemble the battery cell 10.

[0106] In one embodiment of this utility model, such as Figure 3 As shown, the other end of the main shell 111 along the first direction can also be open, and there can be two end caps. The two end caps can be respectively installed on the two open ends of the main shell 111, and the end cap installed on the other end of the main shell 111 along the first direction can be formed as a second wall 113.

[0107] In this embodiment, the two end caps are respectively formed as a first wall 112 and a second wall 113. The structure of the second wall 113 is different from that of the first wall 112 to meet the assembly and use requirements of the battery cell 10. For example, a lower plastic 19 may also be provided at the second wall 113 to insulate and separate it from the electrode assembly 17 and the like in the receiving cavity.

[0108] In some embodiments of this utility model, the battery cell 10 can be a cylindrical battery.

[0109] It is understandable that the arrangement of various components in a cylindrical battery is relatively compact, the space inside the cylindrical battery is relatively small, and the options for the placement of the pressure relief mechanism 12 on the battery cell 10 are also limited. Therefore, the probability of blockage of the pressure relief mechanism 12 in a cylindrical battery is relatively high. In this embodiment, the battery cell 10 is a cylindrical battery, which can effectively reduce the probability of explosion failure and enable the cylindrical battery to pass the thermal runaway test more smoothly, making the battery cell 10 of this embodiment more practical.

[0110] The following is for reference. Figures 1-6 A battery device 100 according to a second aspect embodiment of the present invention is described.

[0111] like Figures 1-6 As shown, the battery device 100 according to an embodiment of the present invention includes a battery cell 10 according to a first aspect embodiment of the present invention.

[0112] Other configurations and operations of the battery cell 10 according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0113] According to the battery device 100 of the present invention, by providing the battery cell 10 of the first aspect embodiment described above, and by providing the housing 11 and the pressure relief mechanism 12, a protrusion 1121 is formed on the side surface of the first wall 112 of the housing 11 facing away from the receiving cavity. The protrusion 1121 extends circumferentially along the explosion-proof hole 1102 of the first wall 112 into an annular shape and defines a pressure relief hole 1101 on the inner side. The pressure relief hole 1101 communicates with the explosion-proof hole 1102. The pressure relief mechanism 12 is installed in the pressure relief hole 1101, so that the pressure relief mechanism 12 is arranged away from the receiving cavity, thereby allowing the through hole 141 of the current collector 14 in the battery cell 10 to be arranged directly opposite to the explosion-proof hole 1102. This allows the battery cell 10 to perform pressure relief operations more stably and reliably, greatly reducing the probability of explosion-proof failure when the battery cell 10 experiences thermal runaway, and thus allowing the battery cell 10 to pass the thermal runaway test more smoothly.

[0114] The following is for reference. Figures 1-6 Describes an energy storage device according to a third aspect of the present invention.

[0115] like Figures 1-6 As shown, the energy storage device according to an embodiment of the present invention includes a battery cell 10 according to a first aspect of the present invention or a battery device 100 according to a second aspect of the present invention, wherein the battery cell 10 or the battery device 100 is used to store or provide electrical energy.

[0116] Other configurations and operations of the energy storage device according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0117] According to the energy storage device of the present invention, by providing the battery cell 10 of the first aspect embodiment or the battery device 100 of the second aspect embodiment, by providing the housing 11 and the pressure relief mechanism 12, a protrusion 1121 is formed on the side surface of the first wall 112 of the housing 11 away from the receiving cavity. The protrusion 1121 extends circumferentially along the explosion-proof hole 1102 of the first wall 112 into a ring and defines a pressure relief hole 1101 on the inner side. The pressure relief hole 1101 communicates with the explosion-proof hole 1102. The pressure relief mechanism 12 is installed in the pressure relief hole 1101, so that the pressure relief mechanism 12 is arranged away from the receiving cavity, so that the through hole 141 of the current collector 14 in the battery cell 10 can be arranged directly opposite to the explosion-proof hole 1102. This allows the battery cell 10 to perform pressure relief operations more stably and reliably, greatly reducing the probability of explosion-proof failure when the battery cell 10 experiences thermal runaway, and allowing the battery cell 10 to pass the thermal runaway test more smoothly.

[0118] The following is for reference. Figures 1-6 Description of an electrical device 1000 according to a fourth aspect embodiment of the present invention.

[0119] like Figures 1-6 As shown, the electrical device 1000 according to an embodiment of the present invention includes a battery cell 10 according to a first aspect of the present invention, a battery device 100 according to a second aspect of the present invention, or an energy storage device according to a third aspect of the present invention. The battery cell 10 or the battery device 100 is used to store or provide electrical energy.

[0120] Other configurations and operations of the electrical device 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0121] According to the embodiment of the present invention, the power device 1000 is provided with a battery cell 10 of the first aspect embodiment, a battery device 100 of the second aspect embodiment, or an energy storage device of the third aspect embodiment. By providing a housing 11 and a pressure relief mechanism 12, a protrusion 1121 is formed on the side surface of the first wall 112 of the housing 11 away from the receiving cavity. The protrusion 1121 extends circumferentially along the explosion-proof hole 1102 of the first wall 112 and defines a pressure relief hole 1101 on the inner side. The pressure relief hole 1101 communicates with the explosion-proof hole 1102. The pressure relief mechanism 12 is installed in the pressure relief hole 1101 and arranged away from the receiving cavity. This allows the through hole 141 of the current collector 14 in the battery cell 10 to be arranged directly opposite the explosion-proof hole 1102. This allows the battery cell 10 to perform pressure relief operations more stably and reliably, greatly reducing the probability of explosion-proof failure when the battery cell 10 experiences thermal runaway. This allows the battery cell 10 to pass the thermal runaway test more smoothly.

[0122] The following will refer to Figures 1-6 This invention describes an electrical device 1000 according to a specific embodiment of the present invention.

[0123] like Figures 1-6 As shown, the electrical device 1000 is a vehicle, and the electrical device 1000 includes a motor 200, a controller 300, and a battery device 100. The controller 300 is used to control the battery device 100 to supply power to the motor 200. The battery device 100 includes a battery cell 10.

[0124] The battery cell 10 is a cylindrical battery, and the battery cell 10 includes a housing 11, a pressure relief mechanism 12, a terminal post 15, a conductive terminal 13, an adapter plate 16, a current collector 14, and an electrode assembly 17.

[0125] The housing 11 includes a main housing 111 and end caps. The main housing 111 extends along a first direction and is open at both ends. There are two end caps, which are respectively installed on the two open ends of the main housing 111. The main housing 111 and the end caps cooperate to define a receiving cavity. The adapter plate 16, the current collector 14, and the electrode assembly 17 are all disposed in the receiving cavity. One end cap is formed as a first wall 112, and the other end cap is formed as a second wall 113. The conductive terminal 13 is disposed on the surface of the first wall 112 facing away from the receiving cavity. There are two pole posts 15, which pass through the first wall 111. 2. It is connected to the conductive terminal 13. The two pole pieces 15 are connected to the adapter piece 16 in the receiving cavity. The adapter piece 16 is connected to the current collector 14. The current collector 14 is located on the side of the electrode assembly 17 facing the first wall 112 and is connected to the electrode tab of the electrode assembly 17. The two pole pieces 15 and the first wall 112, and the conductive terminal 13 and the first wall 112 can be respectively provided with sealing rings and upper plastic 18 for insulation and sealing. The side of the first wall 112 facing the receiving cavity can be provided with lower plastic 19 to insulate and separate the adapter piece 16, current collector 14 and electrode assembly 17.

[0126] The first wall 112 is provided with an explosion-proof hole 1102 and a protrusion 1121 is formed on the side away from the receiving cavity. The protrusion 1121 extends in a ring shape along the circumference of the explosion-proof hole 1102 and defines a pressure relief hole 1101 on the inner side. The pressure relief hole 1101 and the explosion-proof hole 1102 are directly opposite to each other in the first direction and are connected. Specifically, the explosion-proof hole 1102 and the pressure relief hole 1101 can be arranged near the edge of the cover. The collecting plate 14 is provided with a through hole 141, which is directly opposite to the explosion-proof hole 1102 in the first direction.

[0127] When the tabs inside the housing cavity warp after the battery cell 10 is assembled, the pressure relief mechanism 12 is located inside the pressure relief hole 1101. Since the tabs, after passing through the through hole 141, have a large gap with the pressure relief mechanism 12 inside the pressure relief hole 1101, the probability of blockage between the pressure relief mechanism 12 and the housing cavity is significantly reduced. Simultaneously, the pressure relief hole 1101, located on the side of the first wall 112 opposite to the housing cavity, can increase the arrangement space of the pressure relief mechanism 12 and electrode assembly 17 within the battery cell 10 to a certain extent. This significantly reduces the probability of the adapter 16 and the tab sealing post pressure relief mechanism 12 colliding during thermal runaway of the battery cell 10. When thermal runaway occurs in the battery cell 10, high-temperature, high-pressure gas can be stably and smoothly discharged from the battery cell 10 along the through hole 141, the explosion-proof hole 1102, and the pressure relief hole 1101, thereby effectively reducing the risk of casing 11 cracking and battery cell 10 catching fire and exploding.

[0128] In this embodiment, by setting a housing 11 and a pressure relief mechanism 12, a protrusion 1121 is formed on the side surface of the first wall 112 of the housing 11 away from the receiving cavity. The protrusion 1121 extends circumferentially along the explosion-proof hole 1102 of the first wall 112 into a ring and defines a pressure relief hole 1101 on the inner side. The pressure relief hole 1101 communicates with the explosion-proof hole 1102. The pressure relief mechanism 12 is installed in the pressure relief hole 1101, so that the pressure relief mechanism 12 is arranged away from the receiving cavity. This allows the through hole 141 of the current collector 14 in the battery cell 10 to be arranged directly opposite the explosion-proof hole 1102, thereby enabling the battery cell 10 to perform pressure relief operations more stably and reliably, greatly reducing the probability of explosion-proof failure when the battery cell 10 experiences thermal runaway, and thus enabling the battery cell 10 to pass the thermal runaway test more smoothly.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing (11) has a receiving cavity. One side wall of the housing (11) in a first direction is a first wall (112). The first wall (112) is provided with an explosion-proof hole (1102). A protrusion (1121) is formed on the side surface of the first wall (112) opposite to the receiving cavity. The protrusion (1121) extends in a ring shape along the circumference of the explosion-proof hole (1102) and defines a pressure relief hole (1101) on the inner side. The pressure relief hole (1101) communicates with the explosion-proof hole (1102). Pressure relief mechanism (12) is installed inside the pressure relief hole (1101).

2. The battery cell according to claim 1, characterized in that, In the first direction, the distance between the pressure relief mechanism (12) and the side surface of the first wall (112) facing away from the receiving cavity is greater than or equal to 0.8 mm and less than or equal to 2.8 mm.

3. The battery cell according to claim 1, characterized in that, In the first direction, the height of the protrusion (1121) is greater than or equal to 1 mm and less than or equal to 3 mm.

4. The battery cell according to any one of claims 1-3, characterized in that, Also includes: Electrode assembly (17), wherein the electrode assembly (17) is disposed within the receiving cavity; The electrode post (15) extends along the first direction and passes through the first wall (112), and the conductive terminal (13) is disposed on the side of the first wall (112) away from the receiving cavity. The electrode post (15) is connected between the conductive terminal (13) and the electrode assembly (17).

5. The battery cell according to claim 4, characterized in that, In the first direction, the height dimension of the protrusion (1121) is set as a first spacing, and the spacing between the end face of the conductive terminal (13) away from the first wall (112) and the side surface of the first wall (112) away from the receiving cavity is set as a second spacing, wherein the first spacing is less than or equal to the second spacing.

6. The battery cell according to claim 5, characterized in that, The ratio of the first spacing to the second spacing is greater than or equal to 0.3 and less than or equal to 1.

7. The battery cell according to claim 1, characterized in that, Also includes: The electrode assembly (17) and the current collector (14) are both disposed in the receiving cavity. The current collector (14) is disposed on the side of the electrode assembly (17) facing the first wall (112) in the first direction. The current collector (14) is connected to the electrode tab of the electrode assembly (17). The current collector (14) is provided with a through hole (141). The through hole (141) is arranged along the first direction toward the explosion-proof hole (1102).

8. The battery cell according to any one of claims 1-3, characterized in that, The housing (11) includes a main shell (111) and an end cap. The main shell (111) extends along the first direction and is open at one end in the first direction. The end cap is disposed on the open end of the main shell (111) and is formed as the first wall (112).

9. The battery cell according to claim 1, characterized in that, The battery cell is a cylindrical battery.

10. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-9.

11. An energy storage device, characterized in that, Includes a battery cell according to any one of claims 1-9 or a battery device according to claim 10, wherein the battery cell or the battery device is used to store or provide electrical energy.

12. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1-9, a battery device according to claim 10, or an energy storage device according to claim 11, wherein the battery cell or the battery device is used to store or provide electrical energy.

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