Battery monomer, shell, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a shell, a battery and electric equipment, the battery monomer comprises the shell, an electrode assembly and an explosion-proof valve, and the shell is provided with a containing cavity and a communicating hole communicating with the containing cavity; the electrode assembly is accommodated in the accommodating cavity; the anti-explosion valve is connected into the communicating hole; the shell is further provided with a fluid channel, the end of the fluid channel extends to the communicating hole to be communicated with the anti-explosion valve, an opening is formed in the peripheral side of the fluid channel, and the opening is located in the structural face of the containing cavity to face the electrode assembly. According to the technical scheme provided by the embodiment of the invention, the safety performance of the battery monomer can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery cell, a housing, a battery, and an electrical device. Background Art

[0002] An explosion-proof valve is usually provided on the housing of a battery cell. However, due to the limited range of action of the explosion-proof valve, it is difficult to timely discharge the gases generated at different positions of the electrode assembly. Summary of the Utility Model

[0003] A first aspect of this application provides a battery cell, including a housing, an electrode assembly, and an explosion-proof valve. The housing forms a receiving cavity and a communication hole communicating with the receiving cavity; the electrode assembly is received in the receiving cavity; the explosion-proof valve is connected in the communication hole; wherein, the housing further forms a fluid channel, and an end of the fluid channel extends to the communication hole to communicate with the explosion-proof valve, and an opening is provided on the circumferential side of the fluid channel, and the opening is located on the structural surface of the receiving cavity to face the electrode assembly.

[0004] In the technical solution provided by this application, the battery cell includes a housing. The housing forms a receiving cavity for receiving the electrode assembly, and the housing forms a communication hole communicating with the receiving cavity. The explosion-proof valve is connected in the communication hole, and the internal and external spaces of the housing can be communicated through the explosion-proof valve, so that the gases generated by the electrode assembly can flow to the space outside the housing through the explosion-proof valve. On this basis, the housing further forms a fluid channel, and an end of the fluid channel extends to the communication hole, thereby communicating with the explosion-proof valve, and an opening is provided on the circumferential side of the fluid channel. The opening is located on the structural surface of the receiving cavity, that is, the inner surface of the housing, to face the electrode assembly. When gases are generated in the area of the electrode assembly corresponding to the opening, the gases can quickly reach the explosion-proof valve through the fluid channel. It can be understood that the setting of the fluid channel enables the action range of the explosion-proof valve of the cell to also cover a larger area of the electrode assembly, improving the safety performance of the battery cell, and the fluid channel is provided on the housing without occupying additional space, which is beneficial to the miniaturization of the battery cell. Compared with the related art where the action range of the explosion-proof valve is limited, in the technical solution of the embodiment of this application, a fluid channel communicating with the explosion-proof valve is formed on the housing, and the opening of the fluid channel can cover more surfaces of the electrode assembly, thereby broadening the action range of the explosion-proof valve, and forming a fluid channel on the housing is beneficial to the miniaturization of the battery cell.

[0005] In some embodiments of this application, the radial dimension of the fluid channel is uniformly set; or, the radial dimension of the fluid channel gradually increases in the direction towards the communication hole.

[0006] Here, the uniform setting of the radial dimension of the fluid channel is convenient for processing and makes the structure of the housing more regular and the structural stability better; the radial dimension of the fluid channel gradually increases in the direction towards the communication hole, which is beneficial to balancing the air pressure of the gases and facilitating the convergence of the gases towards the explosion-proof valve position.

[0007] In some embodiments of the present application, the fluid channel includes a bottom wall surface opposite to the electrode assembly and two oppositely arranged side wall surfaces; along the direction towards the communication hole, the distance between the bottom wall surface and the electrode assembly gradually increases, or the distance between the two side wall surfaces gradually increases.

[0008] Here, the radial dimension change setting of the fluid channel can be achieved by changing the distance between the bottom wall surface and the electrode assembly, or by changing the distance between the two side wall surfaces, and can be flexibly selected according to design requirements.

[0009] In some embodiments of the present application, there are at least two explosion-proof valves, and the explosion-proof valves are connected to at least one adjacent explosion-proof valve through the fluid channel.

[0010] Here, by providing at least two explosion-proof valves, the gas generated by the electrode assembly can be discharged from the explosion-proof valve with a closer distance, and the two explosion-proof valves are connected through the fluid channel. In the case of partial failure of the explosion-proof valves, the remaining explosion-proof valves still discharge the gas, thereby improving the safety performance of the battery cell.

[0011] In some embodiments of the present application, the fluid channel is bent to form an avoidance space.

[0012] Here, since the fluid channel is bent, an avoidance space is formed to avoid the structure of the electrode assembly or the housing, that is, the fluid channel can be set without changing the relative layout of the electrode assembly and the housing, which can reduce costs.

[0013] In some embodiments of the present application, the housing includes a structural wall provided with a fluid channel, and the fluid channel extends along the length direction of the structural wall; the ratio range of the groove length of the fluid channel to the length of the structural wall is 0.5 - 0.9; the ratio range of the groove width of the fluid channel to the width of the structural wall is 0.5 - 0.95; the ratio range of the groove depth of the fluid channel to the thickness of the structural wall is 0.1 - 0.7.

[0014] Here, a larger size of the fluid channel can increase the flow velocity of the gas, while a larger size of the housing can increase the structural strength. By setting the ratios of the corresponding directions of the two within a reasonable range, the exhaust speed and the structural strength can be balanced to obtain higher safety.

[0015] In some embodiments of the present application, the communication hole is connected to at least one fluid channel, and the end of the fluid channel far from the communication hole extends to the edge of the structural surface where it is located.

[0016] Here, extending the end of the fluid channel far from the communication hole to the edge of the structural surface where it is located can increase the length dimension of the fluid channel, thereby increasing the range of its coverage of the electrode assembly.

[0017] In some embodiments of the present application, the communication hole communicates with at least two fluid channels, and the at least two fluid channels are respectively connected to the communication hole; or, the housing further forms a confluence channel, one end of the confluence channel is connected to the communication hole, and the other end of the confluence channel is connected to at least two fluid channels.

[0018] Here, each communication hole communicates with at least two fluid channels, which can further improve the action range of the corresponding explosion-proof valve, and the at least two fluid channels can be directly connected to the corresponding communication hole, or can be communicated with the communication hole through the confluence channel, that is, the gas in the at least two fluid channels first converges and then flows together to the communication hole.

[0019] In some embodiments of the present application, the communication hole communicates with at least two fluid channels, and the extending directions of the at least two fluid channels are arranged in parallel, or the extending directions of the at least two fluid channels are arranged at an angle.

[0020] Here, the at least two fluid channels can be arranged in parallel or at an angle, so as to facilitate the layout of multiple fluid channels so as to cover a larger surface area of the electrode assembly.

[0021] In some embodiments of the present application, the extending directions of the at least two fluid channels are arranged at an angle and are centrosymmetric about the center of the communication hole.

[0022] Here, the at least two fluid channels are centrosymmetric about the center of the communication hole, so that the distribution of the fluid channels on the housing is more uniform, which is beneficial to improving the structural stability of the housing.

[0023] In some embodiments of the present application, the fluid channel includes a first communication segment and a second communication segment that are connected, and the first communication segment and the second communication segment are arranged on the same structural plane; wherein, the end of the first communication segment extends to the communication hole, the second communication segment is connected to the periphery of the first communication segment, and the extending direction of the second communication segment is arranged at an angle with the extending direction of the first communication segment.

[0024] Here, the fluid channel includes a first communication segment and a second communication segment. The first communication segment extends to the communication hole, and the second communication segment is arranged on the periphery of the first communication segment, and the extending direction of the second communication segment and the extending direction of the first communication segment are arranged at an angle, so that the fluid channel can cover a larger and more detailed range of the electrode assembly to further improve the action range of the explosion-proof valve and enhance the safety performance.

[0025] In some embodiments of the present application, one end of the second communication segment is connected to the first communication segment, and the other end extends to the edge of the corresponding structural plane; or, both ends of the second communication segment are respectively connected to two first communication segments.

[0026] Here, one end of the second connecting section, which is far from the first connecting section, extends to the edge of the corresponding structural plane, which can increase the size of the second connecting section to increase the area of the electrode assembly it covers. The second connecting section can also connect two different first connecting sections, so that there are more flow paths for the gas, further improving the safety performance of the battery cell.

[0027] In some embodiments of the present application, one end of the second connecting section is connected to the first connecting section, and the other end of the second connecting section is inclined towards the connecting hole; or, the other end of the second connecting section is inclined away from the connecting hole; or, the extending direction of the second connecting section is perpendicular to the extending direction of the first connecting section.

[0028] Here, the included angle between the extending direction of the second connecting section and the extending direction of the first connecting section can be an acute angle, an obtuse angle or a right angle. Correspondingly, one end of the second connecting section, which is far from the first connecting section, can be inclined towards or away from the connecting hole to facilitate the layout of the second connecting section.

[0029] In some embodiments of the present application, at least two second connecting sections are arranged on the peripheral side of the first connecting section, and the at least two second connecting sections are evenly distributed along the extending direction of the first connecting section.

[0030] Here, arranging at least two second connecting sections on the peripheral side of the first connecting section and evenly distributing the at least two second connecting sections along the extending direction of the first connecting section can not only increase the range of the electrode assembly covered by the second connecting section, but also make the housing structure more regular and improve the stability of the housing structure.

[0031] In some embodiments of the present application, at least two second connecting sections are arranged on the peripheral side of the first connecting section, and the at least two second connecting sections are respectively arranged on the opposite sides of the first connecting section; the second connecting sections on the opposite sides of the first connecting section are relatively distributed, or the second connecting sections on the opposite sides of the first connecting section are alternately distributed.

[0032] Here, at least two second connecting sections can be distributed on the opposite sides of the first connecting section, and the second connecting sections on both sides of the first connecting section can be relatively arranged or alternately distributed to improve the uniformity of the distribution of the second connecting sections.

[0033] In some embodiments of the present application, the fluid channel includes a connected first connecting section and a third connecting section, and the third connecting section and the first connecting section are respectively located on different structural planes of the accommodating cavity.

[0034] Here, the fluid channel includes a first connecting section and a third connecting section. The first connecting section extends to the connecting hole, and the third connecting section is connected to the first connecting section, and both are located on different structural planes of the accommodating cavity, so that the fluid channel can cover more surfaces of the electrode assembly, further increasing the action range of the explosion-proof valve and improving the safety performance.

[0035] The second aspect of the present application provides a housing, which is formed with a receiving cavity and a communication hole communicating with the receiving cavity. The receiving cavity is used to accommodate an electrode assembly, and the communication hole is used to connect to an explosion-proof valve. Wherein, the housing is further formed with a fluid passage, and the end of the fluid passage extends to the communication hole to communicate with the explosion-proof valve, and an opening is provided on the circumferential side of the fluid passage, and the opening is located on the structural surface of the receiving cavity to face the electrode assembly.

[0036] In the technical solution provided by the present application, a fluid passage communicating with the explosion-proof valve is formed on the housing, and the opening of the fluid passage can cover more surfaces of the electrode assembly, thereby broadening the action range of the explosion-proof valve, and forming a fluid passage on the housing is beneficial to the miniaturization of the battery cell.

[0037] The third aspect of the present application provides a battery, which includes a box body and the battery cell of the first aspect, and at least one battery cell is stacked in the box body.

[0038] In the technical solution provided by the present application, at least one stacked battery cell is accommodated in the box body. A fluid passage communicating with the explosion-proof valve is formed on the housing of the battery cell, and the opening of the fluid passage can cover more surfaces of the electrode assembly, thereby broadening the action range of the explosion-proof valve, and forming a fluid passage on the housing is beneficial to the miniaturization of the battery.

[0039] The fourth aspect of the present application provides an electrical device, which includes an electrical appliance and the battery of the third aspect, and the battery is electrically connected to the electrical appliance.

[0040] In the technical solution provided by the present application, the electrical appliance is electrically connected to the battery. The battery includes at least one battery cell. A fluid passage communicating with the explosion-proof valve is formed on the housing of the battery cell, and the opening of the fluid passage can cover more surfaces of the electrode assembly, thereby broadening the action range of the explosion-proof valve, and forming a fluid passage on the housing is beneficial to the miniaturization of the electrical device. Description of the Drawings

[0041] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0042] Figure 1 It is the front view of the sectional structure of the battery cell provided by the embodiment of the present application;

[0043] Figure 2 It is the left view of the sectional structure of the battery cell provided by the embodiment of the present application;

[0044] Figure 3Top view of the internal structure of the battery cell provided by the embodiment of the present application;

[0045] Figure 4 Right view of the internal structure of the battery cell provided by the embodiment of the present application;

[0046] Figure 5 Provided by the embodiment of the present application Figure 4 Schematic diagram of the partially enlarged structure at A in

[0047] Figure 6 Schematic diagram of the structure with a gradually changing distance between the bottom wall surface and the electrode assembly in the battery cell provided by the embodiment of the present application;

[0048] Figure 7 Schematic diagram of the structure with a gradually changing distance between two side wall surfaces in the battery cell provided by the embodiment of the present application;

[0049] Figure 8 Schematic diagram of the structure with multiple communication holes provided in the battery cell by the embodiment of the present application;

[0050] Figure 9 Schematic diagram of the bent structure section in the battery cell provided by the embodiment of the present application;

[0051] Figure 10 Schematic diagram of the groove width and groove depth of the fluid channel in the battery cell provided by the embodiment of the present application;

[0052] Figure 11 Schematic diagram of the groove width and groove length of the fluid channel in the battery cell provided by the embodiment of the present application;

[0053] Figure 12 Schematic diagram of the structure of the current collecting channel in the battery cell provided by the embodiment of the present application;

[0054] Figure 13 Schematic diagram of the structure with multiple fluid channels parallel to each other in the battery cell provided by the embodiment of the present application;

[0055] Figure 14 Schematic diagram of the structure with multiple fluid channels at an angle in the battery cell provided by the embodiment of the present application;

[0056] Figure 15 Schematic diagram of the structure in which the second communication section is arranged between two first communication sections in the battery cell provided by the embodiment of the present application;

[0057] Figure 16 Schematic diagram of the structure in which the second communication section is arranged on opposite sides of the first communication section in the battery cell provided by the embodiment of the present application;

[0058] Figure 17Schematic diagram of the structure in which the second communication section in the battery cell provided by the embodiment of the present application is inclined

[0059] Figure 18 Schematic diagram of the structure in which the second communication sections in the battery cell provided by the embodiment of the present application are alternately arranged

[0060] Figure 19 Schematic diagram of the first communication section and the third communication section in the battery cell provided by the embodiment of the present application

[0061] Figure 20 Schematic diagram of the structure of the housing provided by the embodiment of the present application

[0062] Figure 21 Schematic diagram of the internal structure of the housing provided by the embodiment of the present application

[0063] Figure 22 Schematic diagram of the structure of the battery provided by the embodiment of the present application

[0064] Figure 23 Schematic diagram of the structure of the electrical equipment provided by the embodiment of the present application

[0065] Description of reference numerals:

[0066] 100 - housing; 110 - accommodation cavity; 111 - structural surface; 120 - communication hole; 130 - fluid channel; 131 - first communication section; 132 - second communication section; 133 - third communication section; 134 - opening; 135 - bottom wall surface; 136 - side wall surface; 137 - bent structure section; 140 - bus bar channel; 150 - avoidance space; 160 - structural wall; 200 - electrode assembly; 300 - explosion-proof valve; 400 - box body; 500 - electrical appliance; X1 - distance between the bottom wall surface and the electrode assembly; X2 - distance between two side wall surfaces; L1 - groove length of the fluid channel; L2 - length of the structural wall; W1 - groove width of the fluid channel; W2 - width of the structural wall; H1 - groove depth of the fluid channel; H2 - thickness of the structural wall Detailed implementation manners

[0067] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and drawings of this application are intended to cover non-exclusive inclusion

[0069] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0070] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0071] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0072] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed, operated or used in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0073] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0074] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense. It can be direct contact, or contact through an intermediate medium layer. It can be contact where there is basically no interaction force between the two contacting objects, or contact where there is an interaction force between the two contacting objects.

[0075] Next, the present application will be described in detail.

[0076] Batteries are increasingly widely used in life and industry. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0077] In order to improve the safety performance of a battery cell, in some technical solutions, an explosion-proof valve is provided on the housing of the battery cell. When high-temperature and high-pressure gas is generated due to a failure of the electrode assembly, it can be quickly discharged through the explosion-proof valve to reduce the possibility of the battery cell causing danger. However, since the explosion-proof valve only corresponds to a part of the electrode assembly, the gas generated in the remaining part of the electrode assembly is difficult to quickly reach the explosion-proof valve, thereby affecting the safety performance of the battery cell.

[0078] The present application addresses the problems existing in the above-mentioned related technologies and proposes a battery cell. Referring to Figure 1 , Figure 2 and Figure 3 , the battery cell includes a housing 100, an electrode assembly 200, and an explosion-proof valve 300. The housing 100 forms a receiving cavity 110 and a communication hole 120 communicating with the receiving cavity 110; the electrode assembly 200 is received in the receiving cavity 110; the explosion-proof valve 300 is connected in the communication hole 120; wherein, the housing 100 further forms a fluid channel 130, and the end of the fluid channel 130 extends to the communication hole 120 to communicate with the explosion-proof valve 300, and an opening 134 is provided on the circumferential side of the fluid channel 130, and the opening 134 is located on the structural surface 111 of the receiving cavity 110 to face the electrode assembly 200.

[0079] In the embodiments of the present application, the housing 100 can have various possible structural forms. The housing 100 can be block-shaped, such as a cuboid, a cube, an oblique parallelepiped, etc., or the housing 100 can be columnar, such as a cylinder, a triangular prism, a hexagonal prism, etc. Referring to Figure 3 and Figure 4 , in one example, the housing 100 is a cuboid structure. It can be understood that the housing 100 is a thin-shell structure, and the contour of the receiving cavity 110 is arranged to be similar to the outer contour of the housing 100.

[0080] In the embodiments of the present application, the housing 100 may be a sealed structure or a non-sealed structure. Exemplarily, when the housing 100 is a non-sealed structure, the housing 100 serves to protect the electrode assembly 200. A sealed bag is further included between the housing 100 and the electrode assembly 200, and the sealed bag is used to encapsulate the electrode assembly 200 and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film.

[0081] In the embodiments of the present application, the explosion-proof valve 300 is configured to open to communicate the accommodation cavity 110 with the outside of the housing 100 when a preset pressure threshold is reached, and the preset pressure threshold can be designed according to the electrode assembly 200. The gas in the electrode assembly 200 accumulates in the explosion-proof valve 300, which will increase the pressure, thereby reaching the preset pressure threshold to trigger the explosion-proof valve 300. The explosion-proof valve 300 opens so that the air flow can be discharged to release the pressure, thereby reducing the risk of damage to the battery cell. Among them, the explosion-proof valve 300 may be a direct-acting type, a piston type, a thimble type, a thin film type, an electromagnetic type, etc., and the embodiments of the present application do not limit this.

[0082] In the embodiments of the present application, the communication hole 120 is used to communicate the accommodation cavity 110 with the outside of the housing 100. The communication hole 120 may be an equal-diameter hole or a variable-diameter hole, such as an equal-diameter hole; the radial cross-section of the communication hole 120 may be circular, elliptical, square, triangular, trapezoidal, rhombic, hexagonal, etc. It can be understood that the contour of the communication hole 120 is adapted to the outer contour of the explosion-proof valve 300, and the explosion-proof valve 300 can be connected to the housing 100 by means of snap connection, bonding, welding, screw connection, etc.

[0083] In the embodiments of the present application, the end of the fluid channel 130 extends to the communication hole 120, that is, one end of the fluid channel 130 is connected to the communication hole 120, and the other end extends in a direction away from the communication hole 120. The axial direction of the fluid channel 130 is the direction parallel to the structure plane 111 where it is located and passing through both end faces. The radial cross-section of the fluid channel 130 may be circular, square, triangular, trapezoidal, rhombic, hexagonal, etc.

[0084] In the embodiments of the present application, the peripheral side of the fluid channel 130 refers to the side parallel to the structure plane 111 where it is located. It can be understood that when the opening 134 is located in its structure plane 111, the opening 134 faces the electrode assembly 200, so that the surface where the electrode assembly 200 is located is exposed to the fluid channel 130. The gas generated at the position of the electrode assembly 200 corresponding to the opening 134 can flow into the fluid channel 130. Among them, the fluid channel 130 may include one or more openings 134. One opening 134 may extend along the axial direction of the fluid channel 130 to both ends of the fluid channel 130 to form a groove-like structure; in the case of multiple openings 134, an opening 134 needs to be provided at the end of the fluid channel 130 away from the communication hole 120.

[0085] In the embodiments of the present application, the structural surface 111 of the accommodation cavity 110 may be a plane, a curved surface, etc. The extension axis of the fluid channel 130 may be a straight line or a curve, such as an arc line, a spiral line, etc., or a combination of a straight line and a curve. The extension axis of the fluid channel 130 is the central axis along its axial direction.

[0086] In the technical solution provided by the embodiments of the present application, the battery cell includes a housing 100. The housing 100 forms an accommodation cavity 110 for accommodating the electrode assembly 200, and the housing 100 forms a communication hole 120 communicating with the accommodation cavity 110. An explosion-proof valve 300 is connected in the communication hole 120. The internal and external spaces of the housing 100 can be communicated through the explosion-proof valve 300, so that the gas generated by the electrode assembly 200 can flow to the space outside the housing 100 through the explosion-proof valve 300.

[0087] On this basis, the housing 100 further forms a fluid channel 130. The end of the fluid channel 130 extends to the communication hole 120, so as to communicate with the explosion-proof valve 300. An opening 134 is provided on the circumferential side of the fluid channel 130. The opening 134 is located on the structural surface 111 of the accommodation cavity 110, that is, the opening 134 is located on the inner surface of the housing 100 and faces the electrode assembly 200. When gas is generated in the area of the electrode assembly 200 corresponding to the opening 134, the gas can quickly reach the explosion-proof valve 300 through the fluid channel 130. It can be understood that the setting of the fluid channel 130 enables the action range of the single explosion-proof valve 300 to also cover a larger area of the electrode assembly 200, improving the safety performance of the battery cell. Moreover, the fluid channel 130 is arranged on the housing 100 without occupying additional space, which is beneficial to the miniaturization of the battery cell.

[0088] Compared with the related art in which the action range of the explosion-proof valve 300 is limited, in the technical solution of the embodiments of the present application, the housing 100 forms a fluid channel 130 communicating with the explosion-proof valve 300. The opening 134 of the fluid channel 130 can cover more surfaces of the electrode assembly 200, thereby broadening the action range of the explosion-proof valve 300. Moreover, the formation of the fluid channel 130 on the housing 100 is beneficial to the miniaturization of the battery cell.

[0089] To improve the structural stability of the housing 100 and facilitate the flow of gas in the fluid channel 130, referring to Figure 3 and Figure 5 , in some possible embodiments of the present application, the radial dimension of the fluid channel 130 is uniformly set. Or, referring to Figure 6 and Figure 7 , the radial dimension of the fluid channel 130 gradually increases in the direction towards the communication hole 120.

[0090] In the embodiments of the present application, the radial direction of the fluid passage 130 refers to any direction perpendicular to its axial direction. It can be understood that the radial direction of the fluid passage 130 can be parallel to the structural surface 111 where it is located, or perpendicular to the structural surface 111 where it is located. The radial dimension of the fluid passage 130 is uniformly set, specifically, the shapes of any radial cross-sections of the fluid passage 130 are the same and the dimensions are equal.

[0091] In the embodiments of the present application, the fluid passage 130 can also be set with variable diameters, which can be stepped variable diameters or gradual variable diameters, that is, the fluid passage 130 includes at least two radial cross-sections with different dimensions, and the surfaces thereof are smoothly transitioned; alternatively, the fluid passage 130 includes a first dimension segment with a larger dimension and a second dimension segment with a smaller dimension, and the first dimension segment and the second dimension segment are alternately distributed along the axial direction of the fluid passage 130.

[0092] In the embodiments of the present application, the fluid passage 130 can also be partially set with equal diameters and the other part with variable diameters. The variable diameter of the fluid passage 130 can be that the dimension of the end far from the communication hole 120 is larger, or the dimension of the end close to the communication hole 120 is larger. Refer to Figure 6 and Figure 7 , in an example, the radial dimension of the fluid passage 130 gradually increases in the direction towards the communication hole 120, that is, the radial dimension of the end of the fluid passage 130 far from the communication hole 120 is smaller than the radial dimension of the end close to the communication hole 120.

[0093] In the technical solution provided by the embodiments of the present application, the uniform setting of the radial dimension of the fluid passage 130 is convenient for processing, and makes the structure of the housing 100 more regular and the structural stability better; the gradual increase of the radial dimension of the fluid passage 130 in the direction towards the communication hole 120 is beneficial to balancing the air pressure of the gas and facilitating the convergence of the gas towards the position of the explosion-proof valve 300.

[0094] In order to realize the setting of the radial dimension change of the fluid passage 130, refer to Figure 6 and Figure 7 , in some possible embodiments of the present application, the fluid passage 130 includes the bottom wall surface 135 opposite to the electrode assembly 200 and two opposite side wall surfaces 136; refer to Figure 6 , in an example, along the direction towards the communication hole 120, the distance X1 between the bottom wall surface 135 and the electrode assembly 200 gradually increases; refer to Figure 7 , in another example, along the direction towards the communication hole 120, the distance X2 between the two side wall surfaces 136 gradually increases.

[0095] In the embodiment of the present application, the radial cross-section of the fluid channel 130 may be rectangular. The fluid channel 130 includes a bottom wall surface 135 and side wall surfaces 136. The bottom wall surface 135 faces the opening 134 of the fluid channel 130, that is, relative to the corresponding surface of the electrode assembly 200. The side wall surfaces 136 are oppositely arranged on the opposite sides of the bottom wall surface 135 parallel to the axial direction of the fluid channel 130.

[0096] In the embodiment of the present application, a gradient can be set for the distance X1 between the bottom wall surface 135 and the electrode assembly 200 and the distance X2 between the two side wall surfaces 136, with one being uniformly set and the other being variably set. Alternatively, both can be variably set. In one example, the distance X1 between the bottom wall surface 135 and the electrode assembly 200 is uniformly set, and the distance X2 between the two side wall surfaces 136 gradually increases or decreases in the direction close to the communication hole 120; in another example, the distance X2 between the two side wall surfaces 136 is uniformly set, and the distance X1 between the bottom wall surface 135 and the electrode assembly 200 gradually increases or decreases in the direction close to the communication hole 120; in yet another example, the distance X2 between the two side wall surfaces 136 gradually increases or decreases in the direction close to the communication hole 120, and the distance X1 between the bottom wall surface 135 and the electrode assembly 200 also gradually increases or decreases in the direction close to the communication hole 120.

[0097] In the technical solution provided by the embodiment of the present application, the variable setting of the radial dimension of the fluid channel 130 can be achieved by changing the distance X1 between the bottom wall surface 135 and the electrode assembly 200, or by changing the distance X2 between the two side wall surfaces 136, and can be flexibly selected according to design requirements.

[0098] To further improve the safety performance of the battery cell, referring to Figure 8 , in some possible embodiments of the present application, there are at least two explosion-proof valves 300, and the explosion-proof valves 300 are connected to at least one adjacent explosion-proof valve 300 through the fluid channel 130.

[0099] In the embodiment of the present application, when one explosion-proof valve 300 is provided, the explosion-proof valve 300 can be located in the middle or at the edge of the structure surface 111; when multiple explosion-proof valves 300 are provided, that is, the number of explosion-proof valves 300 on the housing 100 is two or more, the explosion-proof valves 300 can be located on the same structure surface 111, or on adjacent or opposite structure surfaces 111.

[0100] In the embodiment of the present application, when multiple explosion-proof valves 300 are provided, each explosion-proof valve 300 can be connected to at least one adjacent explosion-proof valve 300 through the fluid channel 130, or can be connected to the fluid channel 130 with the other end freely arranged. Referring to Figure 8, in one example, a plurality of explosion-proof valves 300 arranged linearly are provided on the structural plane 111. The plurality of explosion-proof valves 300 and the plurality of fluid channels 130 are arranged alternately, and adjacent two explosion-proof valves 300 are connected through the corresponding fluid channel 130.

[0101] In the technical solution provided by the embodiment of the present application, by providing at least two explosion-proof valves 300, the gas generated by the electrode assembly 200 can be discharged from the explosion-proof valve 300 with a closer distance, and the two explosion-proof valves 300 are connected through the fluid channel 130. In the case where some explosion-proof valves 300 fail, the remaining explosion-proof valves 300 still discharge the gas, thereby improving the safety performance of the battery cell.

[0102] To reduce the structural influence of the fluid channel 130 on the electrode assembly 200 or the housing 100, referring to Figure 9 , in some possible embodiments of the present application, the fluid channel 130 is bent to form an avoidance space 150.

[0103] In the embodiment of the present application, the fluid channel 130 is bent specifically in that the extending direction of a partial structural segment is bent to form a bent structural segment 137. For example, the bent structural segment 137 can extend obliquely along a straight path; or, the bent structural segment 137 extends along an arc path, or the bent structural segment 137 extends along a trapezoidal path, etc. Referring to Figure 9 , in one example, the bent structural segment 137 is semicircular.

[0104] In the embodiment of the present application, the avoidance space 150 is a space provided relative to the fluid channel 130 at a position adjacent to the bent structural segment 137 in the fluid channel 130. The position of the avoidance space 150 can be used to arrange structural components such as the pole column and connecting piece of the electrode assembly 200, and the liquid injection hole of the housing 100.

[0105] In the technical solution provided by the embodiment of the present application, since the fluid channel 130 is bent to form the avoidance space 150 to avoid the structure of the electrode assembly 200 or the housing 100, that is, without changing the relative layout of the electrode assembly 200 and the housing 100, setting the fluid channel 130 can reduce costs.

[0106] To take into account the gas flow velocity and the structural strength of the housing 100, referring to Figure 10 and Figure 11, in some possible embodiments of the present application, the housing 100 includes a structural wall 160 provided with a fluid channel 130, and the fluid channel 130 extends along the length direction of the structural wall 160; the ratio range of the groove length L1 of the fluid channel 130 to the length L2 of the structural wall 160 is 0.5 - 0.9; the ratio range of the groove width W1 of the fluid channel 130 to the width W2 of the structural wall 160 is 0.5 - 0.95; the ratio range of the groove depth H1 of the fluid channel 130 to the thickness H2 of the structural wall 160 is 0.1 - 0.7.

[0107] In the embodiments of the present application, the structural wall 160 of the housing 100 is specifically an entity structure formed by enclosing a structural surface 111 and the outer surface of the housing 100 relative to it. The length direction of the structural wall 160 corresponds to the length direction of the structural surface 111. The length of the structural wall 160 corresponds to the dimension of the structural surface 111 along the length direction. The width of the structural wall 160 corresponds to the dimension of the structural surface 111 along the width direction. The thickness of the structural wall 160 is the distance between the structural surface 111 and the outer surface of the housing 100 relative to it.

[0108] Correspondingly, the groove length L1 of the fluid channel 130 is the sum of the dimensions of the plurality of fluid channels 130 and the communication holes 120 along the length direction of the corresponding structural surface 111; the width of the fluid channel 130 is the sum of the dimensions of the plurality of fluid channels 130 and the communication holes 120 along the width direction of the corresponding structural surface 111. The width of a single fluid channel 130 is also the distance X2 between two side wall surfaces 136; the groove depth H1 of the fluid channel 130 is the dimension of the fluid channel 130 along the direction perpendicular to the structural surface 111, that is, the distance X1 between the structural surface 111 and the bottom wall surface 135. And in the case where the fluid channel 130 includes a plurality of bottom wall surfaces 135 or the bottom wall surface 135 is an arc surface, the groove depth H1 of the fluid channel 130 is the maximum dimension along the direction perpendicular to the structural surface 111.

[0109] In the embodiments of the present application, the fluid channel 130 is opened on the housing 100. The setting of the fluid channel 130 will reduce the thickness of the corresponding position of the housing 100. It can be understood that the larger the groove length L1 and the groove width W1 of the fluid channel 130 are, the larger the area of the electrode assembly 200 covered by the fluid channel 130 is, and the larger the groove depth H1 of the fluid channel 130 is, the larger the radial cross-sectional area of the fluid channel 130 is; correspondingly, if the dimensions of the groove length L1, the groove width W1, and the groove depth H1 of the fluid channel 130 are smaller, the wall thickness of the corresponding position of the housing 100 can be increased, thereby improving the structural strength of the housing 100.

[0110] In the embodiments of the present application, the ratio of the groove length L1 of the fluid channel 130 to the length L2 of the structural wall 160 can be any value within the range of 0.5 to 0.9, such as 0.5, 0.6, 0.7, 0.8, 0.9, etc.; the ratio of the groove width W1 of the fluid channel 130 to the width W2 of the structural wall 160 can be any value within the range of 0.5 to 0.95, such as 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, etc.; the ratio of the groove depth H1 of the fluid channel 130 to the thickness H2 of the structural wall 160 can be any value within the range of 0.1 to 0.7, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, etc.

[0111] In the technical solution provided by the embodiments of the present application, a larger size of the fluid channel 130 can increase the flow velocity of the gas, while a larger size of the housing 100 can increase the structural strength. By setting the ratios of the corresponding directions of the two within a reasonable range, the exhaust velocity and the structural strength can be taken into account to obtain higher safety.

[0112] To further increase the coverage of the fluid channel 130, referring to Figure 12 , Figure 13 and Figure 14 , in some possible embodiments of the present application, the communication hole 120 is connected to at least one fluid channel 130, and one end of the fluid channel 130 away from the communication hole 120 extends to the edge of the structural surface 111 where it is located.

[0113] In the embodiments of the present application, the fluid channel 130 includes two ends along its axial direction, one end of which extends to the corresponding communication hole 120 to be connected to the communication hole 120. The other end of the fluid channel 130 can be connected to another communication hole 120, or the other end of the fluid channel 130 is freely arranged and can extend to the edge of the structural surface 111 where it is located to increase the groove length L1 of the fluid channel 130.

[0114] Referring to Figure 12 , in one example, a communication hole 120 is provided on the structural surface 111. The communication hole 120 is connected to fluid channels 130 on both sides along the length direction of the structural surface 111 where it is located. The ends of the fluid channels 130 away from the communication hole 120 extend to the edge of the structural surface 111 where they are located. It should be noted that due to the wall thickness of the housing 100, the edge of the structural surface 111 is the inner edge of the housing 100, rather than the outer edge of the housing 100.

[0115] In the technical solution provided by the embodiments of the present application, extending one end of the fluid channel 130 away from the communication hole 120 to the edge of the structural surface 111 where it is located can increase the length dimension of the fluid channel 130, thereby increasing the range of coverage of the electrode assembly 200.

[0116] To facilitate the connection of multiple fluid channels 130 to the connection holes, refer to Figure 12 and Figure 13 , in some possible embodiments of the present application, the communication hole 120 communicates with at least two fluid channels 130, and the at least two fluid channels 130 are respectively connected to the communication hole 120; alternatively, the housing 100 further forms a confluence channel 140, one end of the confluence channel 140 is connected to the communication hole 120, and the other end of the confluence channel 140 is connected to at least two fluid channels 130.

[0117] In the embodiments of the present application, the confluence channel 140 can connect at least two fluid channels 130 to facilitate gas collection. The extending direction of the confluence channel 140 can be a straight line or an arc; the circumferential side of the confluence channel 140 can be closed or an opening 134 can be provided.

[0118] In the embodiments of the present application, the confluence channel 140 can be provided with a constant diameter or a variable diameter. The radial cross-section of the confluence channel 140 can be circular, square, triangular, trapezoidal, rhombic, hexagonal, etc. It can be understood that the radial dimension of the confluence channel 140 should be greater than the radial dimension of the fluid channel 130.

[0119] Refer to Figure 12 , in one example, the confluence channel 140 extends along an arc to form an annular structure surrounding the communication hole 120. Fluid channels 130 are respectively provided on opposite sides of the communication hole 120, and the two fluid channels 130 are respectively connected to the confluence channel 140 to communicate with the communication hole 120.

[0120] In the technical solution provided by the embodiments of the present application, each communication hole 120 communicates with at least two fluid channels 130, which can further improve the action range of the corresponding explosion-proof valve 300, and the at least two fluid channels 130 can be directly connected to the corresponding communication hole 120, or can be connected to the communication hole 120 through the confluence channel 140, that is, the gas in the at least two fluid channels 130 first converges and then flows together to the communication hole 120.

[0121] To facilitate the layout of at least two fluid channels 130, refer to Figure 13 and Figure 14 , in some possible embodiments of the present application, the communication hole 120 communicates with at least two fluid channels 130, and the extending directions of the at least two fluid channels 130 are arranged in parallel, or the extending directions of the at least two fluid channels 130 are arranged at an angle.

[0122] In the embodiments of the present application, the extending directions of the at least two fluid channels 130 are arranged in parallel, that is, along the width direction of the structural surface 111, a plurality of fluid channels 130 are sequentially arranged, and the plurality of fluid channels 130 can be symmetrically arranged or equally spaced.

[0123] In the embodiments of the present application, the extending directions of at least two fluid channels 130 are arranged at an angle, that is, at least two fluid channels 130 arranged at an angle are provided on the same structural surface 111. The angle between the extending directions of the two fluid channels 130 can be a right angle, an acute angle or an obtuse angle. For example, the extending directions of the two fluid channels 130 form an angle of 30 degrees.

[0124] In the embodiments of the present application, multiple fluid channels 130 can be provided on the structural surface 111. The multiple fluid channels 130 include two or more fluid channels 130. Among the multiple fluid channels 130, the extending directions of some of the fluid channels 130 can be arranged in parallel, and the extending directions of the other part of the fluid channels 130 are arranged at an angle.

[0125] In the technical solution provided by the embodiments of the present application, at least two fluid channels 130 can be arranged in parallel or at an angle, so as to facilitate the layout of the multiple fluid channels 130, so as to cover more surface areas of the electrode assembly 200.

[0126] To improve the structural stability of the housing 100, refer to Figure 14 , in some possible embodiments of the present application, the extending directions of at least two fluid channels 130 are arranged at an angle and are centrosymmetric about the center of the communication hole 120.

[0127] In the embodiments of the present application, multiple fluid channels 130 arranged at an angle can be provided on the structural surface 111. The multiple fluid channels 130 include two or more. The extending directions of the multiple fluid channels 130 are arranged at an angle with each other, and the multiple fluid channels 130 can be arranged around the communication hole 120 and are centrosymmetric about the central axis of the communication hole 120, which is applicable to square batteries, cylindrical batteries, etc.

[0128] In the technical solution provided by the embodiments of the present application, at least two fluid channels 130 are centrosymmetric about the center of the communication hole 120, so that the distribution of the fluid channels 130 on the housing 100 is more uniform, which is beneficial to improving the structural stability of the housing 100.

[0129] To further improve the action range of the explosion-proof valve 300, refer to Figure 15 , Figure 16 , Figure 17 and Figure 18 , in some possible embodiments of the present application, the fluid channel 130 includes a first communication segment 131 and a second communication segment 132 that are connected. The first communication segment 131 and the second communication segment 132 are arranged on the same structural surface 111; wherein, the end of the first communication segment 131 extends to the communication hole 120, the second communication segment 132 is connected to the periphery of the first communication segment 131, and the extending direction of the second communication segment 132 is arranged at an angle with the extending direction of the first communication segment 131.

[0130] In the embodiment of the present application, the second connecting section 132 is connected to the first connecting section 131, and the two may adopt the same or different structural forms. In one example, the radial cross-sections of the first connecting section 131 and the second connecting section 132 are both square; in another example, the radial cross-section of the first connecting section 131 is square, and the radial cross-section of the second connecting section 132 is trapezoidal.

[0131] In the embodiment of the present application, the first connecting section 131 and the second connecting section 132 are arranged on the same structural surface 111, that is, the openings 134 of the two are opened on the same structural surface 111, facing the same surface of the electrode assembly 200, and the second connecting section 132 can serve as a supplement to the first connecting section 131. For example, the first connecting section 131 extends along the length direction of the structural surface 111, and the second connecting section 132 extends along the width direction of the structural surface 111.

[0132] In the embodiment of the present application, the extension direction of the first connecting section 131 is along the central axis toward or away from the connecting hole 120 ; the extension direction of the second connecting hole 120 is along the central axis toward or away from the first connecting section 131 .

[0133] In the embodiment of the present application, the extension direction of the second connecting section 132 is arranged at an angle with the extension direction of the first connecting section 131, and the angle between the two can be an acute angle, a right angle or an obtuse angle. Figure 15 , Figure 16 and Figure 18 In one example, the angle between the two is a right angle.

[0134] In the technical solution provided in the embodiment of the present application, the fluid channel 130 includes a first connecting section 131 and a second connecting section 132. The first connecting section 131 extends to the connecting hole 120, and the second connecting section 132 is arranged on the peripheral side of the first connecting section 131, and the extension direction of the second connecting section 132 is at an angle to the extension direction of the first connecting section 131, so that the fluid channel 130 can cover a larger and more detailed range of the electrode assembly 200, so as to further increase the effective range of the explosion-proof valve 300 and enhance the safety performance.

[0135] In order to further enhance the effect of the second connecting section 132, refer to Figure 15 and Figure 16 In some possible embodiments of the present application, one end of the second connecting section 132 is connected to the first connecting section 131, and the other end extends to the edge of the corresponding structural surface 111; or, both ends of the second connecting section 132 are respectively connected to the two first connecting sections 131.

[0136] In the embodiment of the present application, the second connecting section 132 includes two ends along its axial direction, one end of which extends to the corresponding first connecting section 131, and the other end of the second connecting section 132 can be connected to another first connecting section 131, or the other end of the second connecting section 132 is freely arranged and can extend to the edge of the structural surface 111 where it is located.

[0137] In one example, a second connecting section 132 is arranged on one side of the first connecting section 131, and the end of the second connecting section 132 away from the first connecting section 131 extends to the edge of the structural surface 111 along the width direction of the structural surface 111 to increase the groove width W1 of the fluid passage 130.

[0138] In the technical solution provided by the embodiment of the present application, the end of the second connecting section 132 away from the first connecting section 131 extends to the edge of the corresponding structural surface 111, which can increase the size of the second connecting section 132 to increase the area of the electrode assembly 200 it covers. The second connecting section 132 can also connect two different first connecting sections 131, so that the gas has more flow paths, further improving the safety performance of the battery cell.

[0139] For the convenience of arranging the second connecting section 132, referring to Figure 17 , in some possible embodiments of the present application, one end of the second connecting section 132 is connected to the first connecting section 131, and the other end of the second connecting section 132 is inclined towards the communication hole 120; or, the other end of the second connecting section 132 is inclined away from the communication hole 120; or, the extending direction of the second connecting section 132 is perpendicular to the extending direction of the first connecting section 131.

[0140] Specifically, the second connecting section 132 includes a first end and a second end along its axial direction. The first end of the second connecting section 132 is connected to the corresponding first connecting section 131, and the second end of the second connecting section 132 is freely arranged. Referring to Figure 17 , in one example, the distance from the second end of the second connecting section 132 to the communication hole 120 is greater than the distance from its first end to the communication hole 120, and the second connecting section 132 is inclined away from the communication hole 120; in another example, the distance from the second end of the second connecting section 132 to the communication hole 120 is less than the distance from its first end to the communication hole 120, and the second connecting section 132 is inclined towards the communication hole 120.

[0141] Referring to Figure 16 , in another example, the distances from the first end and the second end of the second connecting section 132 to the communication hole 120 are equal, that is, the extending direction of the second connecting section 132 is perpendicular to the extending direction of the first connecting section 131.

[0142] In the embodiments of the present application, a plurality of second communication segments 132 may be arranged on the circumferential side of the first communication segment 131. The plurality of second communication segments 132 include two or more second communication segments 132. The orientations of the plurality of second communication segments 132 on the circumferential side of the first communication segment 131 may be the same or different. In one example, the plurality of second communication segments 132 are all arranged perpendicular to the first communication segment 131; in another example, the second communication segments 132 on one side of the first communication segment 131 are inclined towards the communication hole 120, and the second communication segments 132 on the other side are inclined away from the communication hole 120.

[0143] In the technical solution provided by the embodiments of the present application, the included angle between the extending direction of the second communication segment 132 and the extending direction of the first communication segment 131 may be an acute angle, an obtuse angle or a right angle. Correspondingly, the end of the second communication segment 132 far from the first communication segment 131 may be inclined towards or away from the communication hole 120, so as to facilitate the layout of the second communication segment 132.

[0144] In order to further increase the coverage area of the fluid passage 130, referring to Figure 16 and Figure 18 , in some possible embodiments of the present application, at least two second communication segments 132 are arranged on the circumferential side of the first communication segment 131, and the at least two second communication segments 132 are evenly distributed along the extending direction of the first communication segment 131.

[0145] In the embodiments of the present application, a plurality of second communication segments 132 may be arranged on the circumferential side of the first communication segment 131. The plurality of second communication segments 132 include two or more second communication segments 132. The distance between adjacent two second communication segments 132 along the extending direction of the first communication segment 131 may be the same or different.

[0146] In the embodiments of the present application, the plurality of second communication segments 132 may be arranged on the same side or different sides of the first communication segment 131. Referring to Figure 16 , in one example, a plurality of second communication segments 132 are arranged on both opposite sides of the first communication segment 131, and the plurality of second communication segments 132 on each side are evenly spaced along the extending direction of the first communication segment 131, that is, at least two second communication segments 132 are evenly distributed along the extending direction of the first communication segment 131.

[0147] In the technical solution provided by the embodiments of the present application, arranging at least two second communication segments 132 on the circumferential side of the first communication segment 131 and evenly distributing the at least two second communication segments 132 along the extending direction of the first communication segment 131 can not only increase the range of the electrode assembly 200 covered by the second communication segment 132, but also make the structure of the housing 100 more regular and improve the stability of the structure of the housing 100.

[0148] In order to facilitate the layout of the second communication segment 132, referring to Figure 16 and Figure 18, in some possible embodiments of the present application, at least two second communication segments 132 are provided on the peripheral side of the first communication segment 131, and the at least two second communication segments 132 are respectively provided on opposite sides of the first communication segment 131; referring to Figure 16 , in one example, the second communication segments 132 on opposite sides of the first communication segment 131 are distributed oppositely; alternatively, referring to Figure 18 , in another example, the second communication segments 132 on opposite sides of the first communication segment 131 are distributed alternately.

[0149] In the embodiments of the present application, the second communication segments 132 on opposite sides of the first communication segment 131 are distributed oppositely. Specifically, a plurality of second communication segments 132 are provided on one side of the first communication segment 131, and a corresponding number of second communication segments 132 are also provided on the other side of the first communication segment 131, and the second communication segments 132 on both sides of the first communication segment 131 correspond one by one. Along the direction perpendicular to the first communication segment 131, the projections of the second communication segments 132 on both sides overlap.

[0150] In the embodiments of the present application, the second communication segments 132 on opposite sides of the first communication segment 131 are distributed alternately. Specifically, a plurality of second communication segments 132 are provided on both the first side and the second side of the first communication segment 131. Along the extending direction of the first communication segment 131, the second communication segments 132 on the first side and the second communication segments 132 on the second side are alternately arranged.

[0151] In the technical solution provided by the embodiments of the present application, at least two second communication segments 132 can be distributed on opposite sides of the first communication segment 131, and the second communication segments 132 on both sides of the first communication segment 131 can be arranged oppositely or alternately to improve the distribution uniformity of the second communication segments 132.

[0152] To further improve the coverage range of the fluid channel 130, referring to Figure 19 , in some possible embodiments of the present application, the fluid channel 130 includes a connected first communication segment 131 and a third communication segment 133, and the third communication segment 133 and the first communication segment 131 are respectively located on different structural surfaces 111 of the accommodation cavity 110.

[0153] In the embodiments of the present application, the structure of the third communication segment 133 may be the same as or different from that of the first communication segment 131. In one example, the radial cross-sections of both the first communication segment 131 and the third communication segment 133 are square; in another example, the radial cross-section of the first communication segment 131 is square, and the radial cross-section of the third communication segment 133 is semi-circular.

[0154] In the embodiments of the present application, the third communication section 133 may be directly connected to the first communication section 131, or alternatively, the third communication section 133 is connected to the first communication section 131 through the second communication section 132, that is, the second communication section 132 is disposed between the first communication section 131 and the third communication section 133. In addition, one first communication section 131 may also correspondingly communicate with multiple third communication sections 133.

[0155] In the embodiments of the present application, the third communication section 133 and the first communication section 131 are respectively located on different structural surfaces 111 of the accommodation cavity 110. In one example, the third communication section 133 and the first communication section 131 are respectively located on adjacent side surfaces of the accommodation cavity 110; in another example, the third communication sections 133 are provided on both the adjacent and opposite structural surfaces 111 of the structural surface 111 where the first communication section 131 is located.

[0156] In the technical solution provided by the embodiments of the present application, the fluid passage 130 includes a first communication section 131 and a third communication section 133. The first communication section 131 extends to the communication hole 120, and the third communication section 133 communicates with the first communication section 131, and the two are located on different structural surfaces 111 of the accommodation cavity 110, so that the fluid passage 130 can cover more surfaces of the electrode assembly 200, further improving the action range of the explosion-proof valve 300 and enhancing the safety performance.

[0157] On this basis, the embodiments of the present application further provide a housing 100, referring to Figure 20 and Figure 21 , the housing 100 is formed with an accommodation cavity 110 and a communication hole 120 communicating with the accommodation cavity 110. The accommodation cavity 110 is used to accommodate the electrode assembly 200, and the communication hole 120 is used to connect the explosion-proof valve 300; wherein, the housing 100 is further formed with a fluid passage 130. The end of the fluid passage 130 extends to the communication hole 120 to communicate with the explosion-proof valve 300, and an opening 134 is provided on the circumferential side of the fluid passage 130. The opening 134 is located on the structural surface 111 of the accommodation cavity 110 to face the electrode assembly 200.

[0158] In the technical solution provided by the embodiments of the present application, the housing 100 is formed with a fluid passage 130 communicating with the explosion-proof valve 300. The opening 134 of the fluid passage 130 can cover more surfaces of the electrode assembly 200, thereby broadening the action range of the explosion-proof valve 300, and the formation of the fluid passage 130 on the housing 100 is beneficial to the miniaturization of the battery cell.

[0159] In addition, the embodiments of the present application further provide a battery, referring to Figure 22 , the battery includes a box body 400 and at least one battery cell of the embodiments of the present application (including the housing 100 and the electrode assembly 200 therein, etc.), and at least one battery cell is stacked in the box body 400.

[0160] In the embodiments of the present application, the box body 400 is used to accommodate battery cells. The battery cells can be directly stacked in the box body 400, or the battery cells are stacked to form battery modules, and multiple battery modules are further stacked in the box body 400.

[0161] In the embodiments of the present application, a busbar, a temperature control component, etc. are also provided in the box body 400 or the battery module. The temperature control component can include a heating pad, a water bath pipeline, a heat sink, etc., and is used to improve the working environment of the battery cells.

[0162] In the technical solution provided by the embodiments of the present application, at least one stacked battery cell is accommodated in the box body 400. A fluid channel 130 communicating with the explosion-proof valve 300 is formed on the housing 100 of the battery cell. The opening 134 of the fluid channel 130 can cover more surfaces of the electrode assembly 200, thereby broadening the action range of the explosion-proof valve 300. Moreover, the formation of the fluid channel 130 on the housing 100 is beneficial to the miniaturization of the battery.

[0163] Based on this, the embodiments of the present application also provide an electrical device. Refer to Figure 23 , the electrical device includes an electrical appliance 500 and the battery of the embodiments of the present application (including the housing 100 of the illustrated battery cell), and the battery is electrically connected to the electrical appliance 500.

[0164] In the embodiments of the present application, the electrical device can be a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0165] Exemplarily, when the electrical device is an electric vehicle, the electrical appliance 500 can be a drive motor, a control component, an in-vehicle air conditioner, an in-vehicle entertainment system, etc. in the electric vehicle, and the battery is arranged on the bottom side of the vehicle body.

[0166] In the technical solution provided by the embodiments of the present application, the electrical appliance 500 is electrically connected to the battery. The battery includes at least one battery cell. A fluid channel 130 communicating with the explosion-proof valve 300 is formed on the housing 100 of the battery cell. The opening 134 of the fluid channel 130 can cover more surfaces of the electrode assembly 200, thereby broadening the action range of the explosion-proof valve 300. Moreover, the formation of the fluid channel 130 on the housing 100 is beneficial to the miniaturization of the electrical device.

[0167] Refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 8, in a possible embodiment of the present application, the housing 100 has a square structure. The housing 100 forms a receiving cavity 110, and a communication hole 120 communicating with the receiving cavity 110 is formed on a structural surface 111 of the housing 100. There are two communication holes 120, and the radial cross-section thereof is approximately racetrack-shaped. The two communication holes 120 are arranged in sequence along the length direction of the structural surface 111. A fluid channel 130 is connected between the two communication holes 120. Fluid channels 130 are also respectively connected to the ends of the two communication holes 120 that are away from each other. The end of the fluid channel 130 away from the communication hole 120 extends to the edge of the structural surface 111. The ratio of the groove length L1 of the fluid channel 130 to the length L2 of the structural wall 160 is 0.8. The ratio of the groove width W1 of the fluid channel 130 to the width of the structural wall 160 is 0.5. The ratio of the groove depth H1 of the fluid channel 130 to the thickness H2 of the structural wall 160 is 0.1. The fluid channel 130 includes a first communication section 131 that extends along the length direction of the structural surface 111. When the dimension in the width direction of the structural surface 111 is greater than or equal to 50 mm, a second communication section 132 can be provided. The extending direction of the second communication section 132 is perpendicular to the extending direction of the first communication section 131. The radial cross-sections of the first communication section 131 and the second communication section are both rectangular, and both are of equal-diameter structure. An electrode assembly 200 is installed in the receiving cavity 110 of the housing 100, and an explosion-proof valve 300 is installed in the communication hole 120 to form a battery cell, which can be used for the battery or electrical equipment in the embodiments of the present application.

[0168] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the present application specification. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the application documents.

Claims

1. A battery cell, characterized in that: include: A housing is formed with a receiving cavity and a communicating hole communicating with the receiving cavity; An electrode assembly, contained in the containing cavity; An explosion-proof valve connected in the communicating hole; The shell also forms a fluid channel, the end of which extends to the connecting hole to connect to the explosion-proof valve, and an opening is provided on the peripheral side of the fluid channel, which is located on the structural surface of the accommodating cavity to face the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The radial dimension of the fluid channel is uniformly arranged; or the radial dimension of the fluid channel gradually increases in a direction toward the connecting hole.

3. The battery cell according to claim 2, characterized in that: The fluid channel comprises a bottom wall surface opposite to the electrode assembly, and two side wall surfaces arranged opposite to each other; Along the direction toward the connecting hole, the distance between the bottom wall surface and the electrode assembly gradually increases, or the distance between the two side wall surfaces gradually increases.

4. The battery cell according to claim 1, characterized in that: There are at least two explosion-proof valves, and each explosion-proof valve is connected to at least one adjacent explosion-proof valve through the fluid channel.

5. The battery cell according to claim 1, characterized in that: The fluid channel is bent to form an escape space.

6. The battery cell according to claim 1, characterized in that: The housing comprises a structural wall provided with the fluid channel, and the fluid channel extends along the length direction of the structural wall; The ratio of the groove length of the fluid channel to the length of the structural wall is in the range of 0.5-0.9; The ratio of the groove width of the fluid channel to the width of the structural wall is in the range of 0.5-0.95; The ratio of the groove depth of the fluid channel to the thickness of the structural wall is in the range of 0.1-0.

7.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The communicating hole is connected to at least one of the fluid channels, and one end of the fluid channel away from the communicating hole extends to the edge of the structural surface where the fluid channel is located.

8. The battery cell according to any one of claims 1 to 6, characterized in that: The connecting hole is connected to at least two of the fluid channels, and at least two of the fluid channels are respectively connected to the connecting holes; or, the shell further forms a confluence channel, one end of which is connected to the connecting hole, and the other end of which is connected to at least two of the fluid channels.

9. The battery cell according to any one of claims 1 to 6, characterized in that: The connecting hole is connected to at least two of the fluid channels, and the extension directions of at least two of the fluid channels are arranged in parallel, or the extension directions of at least two of the fluid channels are arranged at an angle.

10. The battery cell according to claim 9, characterized in that: The extension directions of at least two of the fluid channels are arranged at an angle and are symmetrical about the center of the connecting hole.

11. The battery cell according to any one of claims 1 to 6, characterized in that: The fluid channel comprises a first communicating section and a second communicating section which are connected to each other, and the first communicating section and the second communicating section are arranged on the same structural surface; The end of the first connecting section extends to the connecting hole, the second connecting section is connected to the peripheral side of the first connecting section, and the extending direction of the second connecting section is arranged at an angle with the extending direction of the first connecting section.

12. The battery cell according to claim 11, characterized in that: One end of the second connecting section is connected to the first connecting section, and the other end extends to the edge of the corresponding structural surface; or, the two ends of the second connecting section are respectively connected to two of the first connecting sections.

13. The battery cell according to claim 12, characterized in that: One end of the second connecting section is connected to the first connecting section, and the other end of the second connecting section is inclined toward the connecting hole; or, the other end of the second connecting section is inclined away from the connecting hole; or, the extension direction of the second connecting section is perpendicular to the extension direction of the first connecting section.

14. The battery cell according to claim 11, characterized in that: At least two second communicating sections are arranged on the circumferential side of the first communicating section, and the at least two second communicating sections are evenly distributed along the extending direction of the first communicating section.

15. The battery cell according to claim 14, characterized in that: At least two second communicating sections are arranged on the circumferential side of the first communicating section, and the at least two second communicating sections are arranged on two opposite sides of the first communicating section respectively; The second communicating sections on two opposite sides of the first communicating section are arranged relatively to each other, or the second communicating sections on two opposite sides of the first communicating section are arranged alternately.

16. The battery cell according to any one of claims 1 to 6, characterized in that: The fluid channel comprises a first communicating section and a third communicating section which are connected to each other, and the third communicating section and the first communicating section are respectively located on different structural surfaces of the accommodating cavity.

17. A housing, characterized in that: The housing is formed with a housing cavity and a communication hole communicating with the housing cavity, the housing cavity is used to accommodate the electrode assembly, and the communication hole is used to connect the explosion-proof valve; The shell also forms a fluid channel, the end of which extends to the connecting hole to connect to the explosion-proof valve, and an opening is provided on the peripheral side of the fluid channel, which is located on the structural surface of the accommodating cavity to face the electrode assembly.

18. A battery, characterized in that: include: Box; The battery cell according to any one of claims 1 to 16, wherein at least one of the battery cells is stacked in the box.

19. An electrical equipment, characterized in that: include: Electrical appliances; The battery according to claim 18, wherein the battery is electrically connected to the electrical appliance.

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