Battery cell, battery device, energy storage device, energy storage system and charging grid

Abstract

The utility model relates to the technical field of battery equipment, and discloses a battery monomer, a battery device, an energy storage device, an energy storage system and a charging grid. The battery monomer comprises an electrode assembly, a shell main body, a shell cover, a second insulating part and an electrode terminal, the shell cover and the shell main body are covered to form an accommodating space, the shell cover comprises a cover body and a first insulating part, and at least part of the second insulating part is arranged in a first through hole of the shell cover; a containing space is defined by the second insulating part, part of the hole wall of the first through hole, part of the hole wall of the second through hole and the side wall of the electrode terminal, the electrode terminal is electrically connected with the electrode assembly, at least one of the first insulating part and the second insulating part is provided with an exhaust groove, and the exhaust groove is communicated with the containing space and the containing space. The single battery further comprises a pressure relief mechanism, the shell cover is provided with a channel, the pressure relief mechanism is installed in the channel, and the channel and the exhaust groove are arranged at intervals. According to the technical scheme, the problem that abnormal end cover modules flow out due to the fact that inaccurate detection possibly occurs during air tightness detection is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery equipment, and particularly relates to a battery monomer, a battery device, an energy storage device, an energy storage system and a charging grid. BACKGROUND

[0002] In the assembly process of the battery monomer, the sealing ring for sealing the assembly gap between the electrode terminal and the shell cover is prone to be missed, which in turn causes abnormal end cover modules to flow out. Therefore, before the end cover modules are applied to assemble and produce the battery monomer, the end cover modules need to be subjected to air tightness detection. In the air tightness detection process, when some end cover modules missing the sealing ring are detected, since the electrode terminal is fixed on the shell cover by riveting through a tool, the electrode terminal and the shell cover are pressed tightly against each other, that is, they have a certain degree of air tightness but cannot be completely sealed, and since the air pressure of the detection gas used in the air tightness detection is relatively low, in the short time process of filling the detection gas to some end cover modules missing the sealing ring but having a certain degree of air tightness, the detection gas may not be detected, which causes some end cover modules missing the sealing ring to flow out without being detected. These abnormal end cover modules are transported to assemble and produce the battery monomer, which causes the battery monomer to have insufficient reliability and liquid leakage failure, and affects the product performance of the battery monomer. CONTENT OF THE UTILITY MODEL

[0003] The application aims to provide a battery monomer, a battery device, an energy storage device, an energy storage system and a charging grid, and aims to solve the problem that abnormal end cover modules flow out due to the inaccurate detection in the air tightness detection.

[0004] To achieve the above-mentioned purpose, according to the first aspect of the embodiment of the application, a battery monomer is provided, which comprises an electrode assembly, a shell main body, a shell cover, a second insulating piece and an electrode terminal, the electrode assembly has a tab, the shell cover is combined with the shell main body to form a containing space, the electrode assembly is arranged in the containing space, the shell cover comprises a cover body and a first insulating piece, the first insulating piece is arranged on the side of the cover body facing the shell main body, the cover body is provided with a first through hole, the first insulating piece is provided with a second through hole, the first through hole and the second through hole are opposite to each other, at least part of the second insulating piece is arranged in the first through hole, the electrode terminal is arranged through the second insulating piece, the first through hole and the second through hole, the end face of the second insulating piece facing the shell main body, part of the hole wall of the first through hole, part of the hole wall of the second through hole and the side wall of the electrode terminal surround a receiving space for accommodating a sealing ring, and the electrode terminal is electrically connected with the tab. Wherein, at least one of the first insulating piece and the second insulating piece is provided with an exhaust groove, the exhaust groove is communicated with the containing space and the receiving space, the shell cover is provided with a channel, a pressure relief mechanism is installed in the channel, and the channel is arranged in a spaced manner with the exhaust groove.

[0005] In the battery cell, at least one of the first insulating piece of the shell cover and the second insulating piece arranged on the shell cover is provided with an exhaust groove, which communicates the accommodation space formed by the shell cover and the shell main body and the receiving space for accommodating the sealing ring. In this way, when the sealing ring is installed in the receiving space during the air tightness detection of the end cover module assembled by the shell cover, the second insulating piece and the electrode terminal, the sealing ring is formed between the shell cover, the second insulating piece and the electrode terminal. Good sealing, the detection gas cannot flow between the two sides of the shell cover; when the sealing ring is missing in the receiving space, due to the arrangement of the exhaust groove, the exhaust groove is beneficial to guide the flow of the detection gas to the receiving space and / or guide the detection gas reaching the receiving space to flow to the outside, that is, to improve the flow of the detection gas between the two sides of the shell cover, thereby improving the effectiveness of the air tightness detection, improving the success rate of detecting the missing sealing ring, and reducing the possibility of abnormal end cover module flow. In this way, during the production of the battery cell provided by the embodiments of the application, the missing sealing ring of the end cover module can be efficiently and accurately detected and determined, not only the unit process time of the air tightness detection of the shell cover can be shortened, but also the shell cover that passes the air tightness detection is applied to assemble and produce the battery cell, which is beneficial to improve the reliability of the assembled and produced battery cell and improve the product performance of the assembled and produced battery cell.

[0006] In some embodiments, the first insulating piece is provided with a first exhaust groove, one end of the first exhaust groove penetrates the receiving space, and the other end of the first exhaust groove penetrates the accommodation space. Helium can flow smoothly along the first exhaust groove into the receiving space, thereby improving the success rate of detecting the missing sealing ring.

[0007] In some embodiments, the first exhaust groove is arranged on the side of the first insulating piece facing the cover body; and / or, the first exhaust groove is arranged on the side of the first insulating piece away from the cover body, and the first exhaust groove is covered by the electrode terminal.

[0008] In some embodiments, the side of the first insulating piece facing the accommodation space is provided with a clamping groove, the second through hole communicates the clamping groove, the first exhaust groove is arranged on the groove wall of the clamping groove, and one end of the electrode terminal facing the accommodation space is clamped and fixed in the clamping groove and covers the first exhaust groove. The electrode terminal and the shell cover are stably assembled, and the smooth flow of helium from the side of the shell cover where helium is filled to the side where helium is detected can be improved, thereby improving the success rate of detecting the missing sealing ring.

[0009] In some embodiments, the number of first exhaust grooves is a plurality, and the plurality of first exhaust grooves are distributed circumferentially and spaced apart around the second through hole.

[0010] In some embodiments, the second insulation member is provided with a second exhaust groove, one end of the second exhaust groove penetrating the accommodation space, and the other end of the second exhaust groove being in communication with the outside. Helium gas can flow along the second exhaust groove from the accommodation space to the side where the helium gas is detected, thereby improving the success rate of detecting the missing sealing ring and reducing the possibility of abnormal end cover module outflow.

[0011] In some embodiments, the other end of the second exhaust groove penetrates to the outside of the side of the second insulation member away from the first insulation member.

[0012] In some embodiments, the second exhaust groove is provided on the inner wall of the second insulation member facing the electrode terminal; and / or, the second exhaust groove is provided on the outer wall of the second insulation member away from the electrode terminal.

[0013] In some embodiments, the number of second exhaust grooves is multiple, and the multiple second exhaust grooves are distributed circumferentially around the central axis of the second insulation member.

[0014] In some embodiments, the groove depth of the exhaust groove is 0.1mm-1.0mm. On the basis of ensuring the structural strength of the first insulation member and the second insulation member, the gas flow can be detected by the exhaust groove, thereby improving the success rate of detecting the missing sealing ring and reducing the possibility of abnormal end cover module outflow.

[0015] According to a second aspect of embodiments of the present application, a battery device is provided. Wherein the battery device comprises the battery cell as described above, and the battery cell is used for storing or providing electric energy.

[0016] According to a third aspect of embodiments of the present application, an energy storage device is provided. Wherein:

[0017] The energy storage device comprises the battery cell as described above, and the battery cell is used for storing or providing electric energy;

[0018] Alternatively, the energy storage device comprises the battery device as described above, and the battery device is used for storing or providing electric energy.

[0019] According to a fourth aspect of embodiments of the present application, an energy storage system is provided. Wherein the energy storage system comprises:

[0020] A power conversion device; and,

[0021] The energy storage device as described above, and the power conversion device is electrically connected between the power generation device and the energy storage device.

[0022] According to a fifth aspect of embodiments of the present application, a charging grid is provided. Wherein the charging grid comprises a charging pile; and,

[0023] The charging grid further comprises the energy storage device as described above, and the charging pile is electrically connected with the energy storage device;

[0024] Alternatively, the charging grid further comprises an energy storage system as described above, and the charging pile is electrically connected with the energy storage system.

[0025] The energy storage device is configured to provide electric energy for the charging pile. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0027] Figure 1 A structural schematic diagram of a battery cell of an embodiment of the present application;

[0028] Figure 2 A structural schematic diagram of a battery cell of an embodiment of the present application; Figure 1 An exploded schematic diagram of the battery cell;

[0029] Figure 3 A bottom view schematic diagram of an embodiment of the assembly of a shell cover, an electrode terminal and a second insulating piece of a battery cell of an embodiment of the present application;

[0030] Figure 4 A sectional view schematic diagram of the A-A direction in the above figure; Figure 3

[0031] A sectional view schematic diagram of the B direction in the above figure; Figure 5 Figure 4 A sectional view schematic diagram of the B direction in the above figure;

[0032] Figure 6 Figure 3 A bottom view schematic diagram of the first insulating piece of the shell cover;

[0033] Figure 7 A top view schematic diagram of the first insulating piece of a shell cover of a battery cell of an embodiment of the present application;

[0034] Figure 8 A top view schematic diagram of another embodiment of the assembly of a shell cover, an electrode terminal and a second insulating piece of a battery cell of an embodiment of the present application;

[0035] Figure 9 A sectional view schematic diagram of the C direction in the above figure; Figure 8

[0036] A sectional view schematic diagram of the C direction in the above figure; Figure 10 Figure 8 A sectional view schematic diagram of the C direction in the above figure;

[0037] Figure 11 ​​​Another embodiment of a top view schematic diagram of a battery cell of an embodiment of the present application, an electrode terminal, and a second insulating member assembled together;

[0038] Figure 12 For Figure 11 An enlarged schematic diagram at D;

[0039] Figure 13 An exploded schematic diagram of a battery device of an embodiment of the present application;

[0040] Figure 14 A structural schematic diagram of an energy storage device of an embodiment of the present application.

[0041] In the drawings, each of the reference numerals represents:

[0042] 100, battery cell;

[0043] 10, electrode assembly; 11, tab;

[0044] 20, shell main body; 21, accommodation space;

[0045] 30, shell cover; 31, cover body; 311, first through hole; 32, first insulating member; 321, first exhaust groove; 322, second through hole; 323, clamping groove;

[0046] 40, second insulating member; 41, second exhaust groove; 42, clamping space;

[0047] 50, electrode terminal; 51, pressure relief mechanism; 510, passage;

[0048] 61, accommodation space; 62, sealing ring;

[0049] 200, battery device; 201, box main body; 202, box cover; 203, assembly space;

[0050] 300, energy storage device; 301, cabinet body;

[0051] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0052] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0053] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0055] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station (the battery device of such application is generally referred to as energy storage battery), but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles (such as power batteries). With the continuous expansion of the application field of battery device, its market demand is also increasing.

[0057] In the related art, in the assembly process of the battery monomer, the sealing ring for sealing the assembly gap between the electrode terminal and the shell cover is prone to be missed, which in turn causes abnormal end cover module to flow out. Therefore, before the end cover module is applied to assemble and produce the battery monomer, the air tightness of the end cover module needs to be detected.

[0058] In the airtightness detection process, when some end cover modules with missing sealing rings are detected, because the electrode terminals are fixed on the shell cover by riveting of the tool, the electrode terminals and the shell cover are pressed tightly, that is, they have a certain degree of airtightness but cannot be completely sealed. In addition, the detection gas used in the airtightness detection has a relatively low pressure. In the short time of filling the detection gas, some end cover modules with missing sealing rings but having a certain degree of airtightness may not be detected, resulting in some end cover modules with missing sealing rings flowing out. These abnormal end cover modules are transported to assemble battery monomers, which may cause insufficient reliability of the battery monomers, liquid leakage failure, and affect the product performance of the battery monomers.

[0059] Based on the above considerations, embodiments of the present application provide a battery monomer. In the battery monomer, at least one of the first insulating member of the shell cover and the second insulating member arranged on the shell cover is provided with an exhaust groove. The exhaust groove communicates the accommodation space formed by the shell main body and the shell cover and the receiving space for accommodating the sealing ring. In this way, when the end cover module assembled by the shell cover, the second insulating member and the electrode terminal is subjected to airtightness detection, when the receiving space is installed with the sealing ring, the shell cover, the second insulating member and the electrode terminal form good sealing through the sealing ring, and the detection gas cannot flow between the two sides of the shell cover. When the receiving space is missing the sealing ring, because the exhaust groove is arranged, the exhaust groove is beneficial to guide the detection gas to flow to the receiving space and / or guide the detection gas reaching the receiving space to flow to the outside, that is, to improve the flowability of the detection gas between the two sides of the shell cover, thereby improving the effectiveness of the airtightness detection, improving the success rate of detecting the missing sealing ring, and reducing the possibility of abnormal end cover module flowing out. In this way, in the process of producing the battery monomer provided by the embodiments of the present application, the missing sealing ring of the end cover module can be efficiently and accurately detected and determined. Not only can the unit process time of the airtightness detection of the shell cover be shortened, but also the shell cover passing the airtightness detection is applied to assemble and produce the battery monomer, which is beneficial to improve the reliability of the assembled and produced battery monomer and improve the product performance of the assembled and produced battery monomer.

[0060] In order to illustrate the technical solutions provided by the embodiments of the present application, the following will be described in detail in combination with specific drawings and embodiments.

[0061] According to a first aspect of the embodiments of the present application, the embodiments of the present application provide a battery monomer. As Figures 1 to 9 、 Figure 11 and Figure 12As shown, the battery cell 100 includes an electrode assembly 10, a housing body 20, a housing cover 30, a second insulating member 40, and electrode terminals 50. The electrode assembly 10 has tabs 11, and the housing cover 30 and the housing body 20 are closed together along a first direction X to form a receiving space 21, in which the electrode assembly 10 is disposed. The cover 30 includes a cover body 31 and a first insulating member 32. The first insulating member 32 is disposed on the side of the cover body 31 facing the main body 20. The cover body 31 has a first through hole 311, and the first insulating member 32 has a second through hole 322. The first through hole 311 and the second through hole 322 are directly opposite each other. At least a portion of the second insulating member 40 is disposed in the first through hole 311. The electrode terminal 50 passes through the second insulating member 40, the first through hole 311 of the cover body 31, and the second through hole 322 of the first insulating member 32 (or, the second insulating member 40 may pass through the first through hole 311 and extend into the second through hole 322, in which case the electrode terminal 50 passes through the second insulating member 40 and the first insulating member 32; or the second insulating member 40 may pass through the first through hole 311 but...). The end face of the second insulating member 40, the end face of the opening of the first through hole 311, and the end face of the opening of the second through hole 322 are all in the same plane. At this time, the electrode terminal 50 passes through the second insulating member 40 and the first insulating member 32. The end cap module of the battery cell 100 is assembled by the cover 31, the first insulating member 32, the second insulating member 40, and the electrode terminal 50. That is, the end cap module is assembled as a whole with the electrode assembly 10 and the shell body 20 to form the battery cell 100. The end face of the second insulating member 40 facing the shell body 20, part of the hole wall of the first through hole 311, part of the hole wall of the second through hole 322, and the side wall of the electrode terminal 50 form a receiving space 61 for accommodating the sealing ring 62. Before the end cap module is completely covered to the opening end of the shell body 20 and the sealing gap between the cover 31 and the shell body 20 is welded, the electrode terminal 50 and the tab 11 need to be electrically connected. At least one of the first insulating member 32 and the second insulating member 40 is provided with a venting groove, which connects the receiving space 21, the receiving space 61 and the outside. The battery cell 100 also includes a pressure relief mechanism 51, and the cover 30 is provided with a channel 510. The pressure relief mechanism 51 is installed in the channel 510, and the channel 510 is spaced apart from the venting groove.

[0062] like Figure 2 As shown in the figure, the positive and negative directions of the X-axis are the first direction X, the positive and negative directions of the Y-axis are the second direction Y, and the positive and negative directions of the Z-axis are the third direction Z.

[0063] In the battery cell 100, at least one of the first insulating member 32 of the end cover module and the second insulating member 40 arranged on the shell cover 30 is provided with an exhaust groove, the shell cover 30 and the shell main body 20 are covered to form a containing space 21 along the first direction X, the second insulating member 40, the hole wall of the first through hole 311, the hole wall of the second through hole 322 and the electrode terminal 50 at one end of the shell main body 20 enclose a receiving space 61 for accommodating the sealing ring 62, and the exhaust groove communicates the containing space 21, the receiving space 61 and the outside. In this way, when the end cover module which has completed the assembly process is subjected to the air tightness detection, when the sealing ring 62 is installed in the receiving space 61, the shell cover 30, the second insulating member 40 and the electrode terminal 50 form good sealing through the sealing ring 62, and the detection gas cannot flow between the two sides of the shell cover 30; when the sealing ring 62 is missing in the receiving space 61, since the exhaust groove is provided, the exhaust groove is conducive to guiding the detection gas to flow to the receiving space 61 and / or guiding the detection gas reaching the receiving space 61 to flow to the outside, i.e. improving the flowability of the detection gas between the two sides of the shell cover 30, thereby improving the effectiveness of the air tightness detection, improving the success rate of detecting the missing sealing ring 62, and reducing the possibility of abnormal end cover module flow. In this way, in the process of producing the battery cell 100 provided by the embodiment of the application, the end cover module can be efficiently and accurately detected to determine whether the sealing ring 62 is missing, not only can the unit process time of the air tightness detection of the end cover module be shortened, but also the end cover module which passes the air tightness detection is applied to assemble and produce the battery cell 100, which is conducive to improving the reliability of the assembled and produced battery cell 100 and improving the product performance of the assembled and produced battery cell 100.

[0064] The above-mentioned "air tightness detection" is helium detection of the end cover module by using a helium detection device. In the detection process, the end cover module is placed on the helium detection device, so that the two sides of the end cover module are isolated to form a helium-filled side cavity and a detection helium side cavity, and then the helium-filled side cavity is filled with helium by the helium detection device. During the filling process, if the end cover module is missing the sealing ring 62, the helium will flow into the detection helium side cavity, and then be detected by the helium detection probe of the helium detection device, so as to detect and determine that the end cover module is missing the sealing ring 62; if the end cover module has installed the sealing ring 62, the helium cannot flow to the detection helium side cavity, i.e. the helium detection probe of the helium detection device will not detect the helium all the time, so as to detect and determine that the end cover module has installed the sealing ring 62.

[0065] The above-mentioned "outside" is a relative concept with respect to the containing space 21. For the battery cell 100, the containing space 21 is an internal space, and the environmental space of the battery cell 100 is the outside, and the containing space 21 of the qualified battery cell 100 and the outside are completely sealed.

[0066] The "unit process time" above refers to the average length of time required to perform airtightness detection on a single shell cover 30 during the process of airtightness detection on the shell cover 30.

[0067] When the electrode terminal 50 is fixed on the shell cover 30 by the tool riveting, due to the strong riveting force of the tool, although the electrode terminal 50 and the first insulating piece 32 and the cover body 31 and the first insulating piece 32 are pressed tightly to have a certain degree of airtightness, the electrode terminal 50 and the first insulating piece 32 and the cover body 31 and the first insulating piece 32 are actually not in a sealed state. If the sealing ring 62 is missing and the electrode terminal 50 and the first insulating piece 32 and the cover body 31 and the first insulating piece 32 are not sealed, the electrolyte inside the battery monomer 100 will slowly leak during the long-term use of the battery monomer 100, that is, the so-called liquid leakage failure, which is manifested as the electrolyte leaking around the electrode terminal 50. Therefore, it is necessary to detect the airtightness of the completed end cover module to determine whether the sealing ring is missing to ensure the airtightness.

[0068] Since the electrode terminal 50 and the first insulating piece 32 and the cover body 31 and the first insulating piece 32 are not in a sealed state, in some embodiments, the exhaust groove does not directly communicate with the containing space 21, the receiving space 61 and / or the outside, but connects the fine gap space between the electrode terminal 50 and the first insulating piece 32 and / or the cover body 31 and the first insulating piece 32. In other words, the exhaust groove communicates the containing space 21, the receiving space 61 and the outside through the fine gap space between the electrode terminal 50 and the first insulating piece 32 and / or the cover body 31 and the first insulating piece 32, so that the flow of the detection gas between the two sides of the end cover module missing the sealing ring 62 is enhanced during airtightness detection. In this way, if the end cover module being subjected to airtightness detection is missing the sealing ring 62, the detection gas will flow smoothly from one side of the end cover module to the other side, so that the detection gas can be detected efficiently and accurately to determine that the end cover module is missing the sealing ring 62, otherwise the detection gas cannot be detected.

[0069] Hereinafter, the "one side of the shell cover 30 facing the containing space 21 forms a helium-filled side cavity on the helium detection equipment, and the other side of the shell cover 30 away from the containing space 21 forms a detection helium side cavity on the helium detection equipment" is taken as an example for description.

[0070] In some embodiments, as Figure 3 , Figures 5 to 7As shown, the first insulation member 32 is provided with a first exhaust groove 321, one end of the first exhaust groove 321 penetrates to the accommodation space 61, the other end of the first exhaust groove 321 penetrates to the containing space 21, and the first exhaust groove 321 is spaced apart from the channel 510. That is, when performing the air tightness detection, the helium is filled into the side of the shell cover 30 facing the containing space 21, and the helium can flow smoothly along the first exhaust groove 321 to the accommodation space 61. In this way, when the end cover module with the missing sealing ring 62 is subjected to the air tightness detection, the smooth flow of the helium from the side of the shell cover 30 where the helium is filled to the side where the helium is detected can be improved, thereby improving the success rate of detecting the missing sealing ring 62 and reducing the possibility of abnormal end cover module flowing out.

[0071] The above-mentioned "communication" refers to: taking the communication between the first exhaust groove 321 and the accommodation space 61 as an example, the first exhaust groove 321 can be indirectly connected to the accommodation space 61 through some corresponding gaps, that is, the detection gas can flow from the first exhaust groove 321 to the accommodation space 61; or one end of the first exhaust groove 321 can directly extend to the accommodation space 61 so that the detection gas can flow to the accommodation space, that is, the above-mentioned "penetration". That is, the "communication" includes the direct connection mode and the indirect connection mode, and the "penetration" is the direct connection mode.

[0072] In some embodiments, as shown in FIG. 1, Figure 7 As shown, the first exhaust groove 321 is arranged on the side of the first insulation member 32 facing the cover body 31. In this embodiment, the first exhaust groove 321 can be a horizontal straight groove or a horizontal curved groove, and the two ends of the first exhaust groove 321 penetrate to the accommodation space 61 and the containing space 21, respectively. In this way, when the end cover module with the missing sealing ring 62 is subjected to the air tightness detection, the smooth flow of the helium from the side of the shell cover 30 where the helium is filled to the side where the helium is detected can be improved, thereby improving the success rate of detecting the missing sealing ring 62 and reducing the possibility of abnormal end cover module flowing out.

[0073] In some embodiments, as shown in FIG. 1, Figure 3 , Figure 5 and Figure 6As shown, the first exhaust groove 321 is arranged on the side of the first insulating member 32 away from the cover 31, and the first exhaust groove 321 is covered by the electrode terminal 50. In the embodiment, the first exhaust groove 321 can include a transverse groove segment and a longitudinal groove segment connected in communication, and two ends of the first exhaust groove 321 respectively penetrate the accommodation space 61 and the containing space 21, or the first exhaust groove 321 can be only a transverse groove segment. In this way, when the air tightness of some end cover modules with missing sealing rings 62 is detected, the smooth flow of helium from the side of the shell cover 30 where helium is filled to the side where helium is detected can be improved, thereby improving the success rate of detecting missing sealing rings 62 and reducing the possibility of abnormal end cover modules flowing out.

[0074] The above-mentioned "longitudinal direction" is the first direction X. Correspondingly, the above-mentioned "transverse direction" refers to a direction perpendicular to the first direction X, that is, the transverse direction can be the second direction Y, or the third direction Z, or other directions perpendicular to the first direction X.

[0075] In other embodiments, not only is the side of the first insulating member 32 toward the cover 31 provided with the first exhaust groove 321, but also the side of the first insulating member 32 away from the cover 31 is provided with the first exhaust groove 321. Moreover, two ends of these first exhaust grooves 321 respectively penetrate the containing space 21 and the accommodation space 61.

[0076] In some embodiments, as shown in Figure 5 and Figure 6 As shown, the first insulating member 32 is provided with a clamping groove 323 on the side toward the containing space 21, and the first exhaust groove 321 is arranged on the groove wall of the clamping groove 323, wherein the groove wall of the clamping groove 323 includes a longitudinal groove side wall and a transverse groove bottom wall. In the embodiment, the first exhaust groove 321 includes a longitudinal groove segment arranged on the groove side wall and a transverse groove segment arranged on the groove bottom wall. The second through hole 322 penetrates the groove bottom wall, that is, the second through hole 322 communicates with the clamping groove 323, and one end of the electrode terminal 50 toward the containing space 21 is clamped and fixed in the clamping groove 323, so that the electrode terminal 50 and the shell cover 30 are stably assembled, and the end of the electrode terminal 50 covers the first exhaust groove 321. In this way, when the air tightness of some end cover modules with missing sealing rings 62 is detected, the smooth flow of helium from the side of the shell cover 30 where helium is filled to the side where helium is detected can be improved, thereby improving the success rate of detecting missing sealing rings 62 and reducing the possibility of abnormal end cover modules flowing out.

[0077] In some embodiments, the electrode terminal 50 protrudes from the first insulating member 32 toward one side of the housing space 21 at one end of the housing space 21, and the outer diameter of the electrode terminal 50 at the one end of the housing space 21 is greater than the hole diameter of the second through hole 322. In the present embodiment, the first exhaust groove 321 can be only a transverse groove segment, and the first exhaust groove 321 extends beyond the edge of the electrode terminal 50 at the one end of the housing space 21 away from the housing space 61.

[0078] In some embodiments, as shown in Figure 3 , Figures 5 to 7 regardless of whether the first exhaust groove 321 is arranged on the side of the first insulating member 32 facing the cover 31 or on the side of the first insulating member 32 away from the cover 31, the number of first exhaust grooves 321 is multiple, and the multiple first exhaust grooves 321 are circumferentially spaced around the second through hole 322. The multiple first exhaust grooves 321 further improve the smooth flow of helium from the side of the shell cover 30 where helium is filled to the side where helium is detected, thereby increasing the success rate of detecting the missing sealing ring 62 when performing the air tightness test on some end cover modules with missing sealing rings 62, and reducing the possibility of abnormal end cover modules flowing out.

[0079] In some embodiments, as shown in Figures 8 to 12 the second insulating member 40 is provided with a second exhaust groove 41, one end of the second exhaust groove 41 penetrates the housing space 61, the other end of the second exhaust groove 41 communicates with the outside, and the second exhaust groove 41 is arranged spaced apart from the channel 510. In the present embodiment, when performing the air tightness test, helium is filled on the side of the shell cover 30 facing the housing space 21, and after the helium can flow to the housing space 61 through the gap between the first insulating member 32 and the electrode terminal 50 and / or the gap between the cover 31 and the first insulating member 32, the helium can flow along the second exhaust groove 41, that is, the helium flows smoothly from the housing space 61 to the side where helium is detected. In this way, when performing the air tightness test on some end cover modules with missing sealing rings 62, the success rate of detecting the missing sealing ring 62 can be improved, and the possibility of abnormal end cover modules flowing out can be reduced.

[0080] In some embodiments, as shown in Figures 8 to 12 the other end of the second exhaust groove 41 penetrates the outside of the side of the second insulating member 40 away from the first insulating member 32. That is, both ends of the second exhaust groove 41 of the present embodiment penetrate the housing space 61 and the outside, respectively. In this way, the helium in the housing space 61 can flow along the second exhaust groove 41, so that the helium can flow directly from the housing space 61 to the side where helium is detected. In this way, when performing the air tightness test on some end cover modules with missing sealing rings 62, the success rate of detecting the missing sealing ring 62 can be improved, and the possibility of abnormal end cover modules flowing out can be reduced.

[0081] In some embodiments, as shown in FIG. 1, the second exhaust groove 41 is arranged on the inner wall of the second insulating member 40 facing the electrode terminal 50, and both ends of the second exhaust groove 41 pass through the accommodation space 61 and the outside. In this embodiment, the second insulating member 40 is provided with a clamping space 42, and the end of the electrode terminal 50 away from the accommodation space 21 is clamped and fixed in the clamping space 42 and covers the second exhaust groove 41. At this time, the outer contour projection of the end of the electrode terminal 50 away from the accommodation space 21 along the first direction X covers the projection of the first through hole 311 along the first direction X. Alternatively, in other embodiments, as shown in FIG. 2, the second exhaust groove 41 is arranged on the outer wall of the second insulating member 40 away from the electrode terminal 50, and both ends of the second exhaust groove 41 pass through the accommodation space 61 and the outside. In this embodiment, the second insulating member 40 is provided with a clamping space 42, and the end of the electrode terminal 50 away from the accommodation space 21 is clamped and fixed in the clamping space 42. At this time, the outer diameter of the end of the electrode terminal 50 away from the accommodation space 21 is substantially equal to the hole diameter of the first through hole 311. Alternatively, in still other embodiments, the inner wall of the second insulating member 40 facing the electrode terminal 50 and the outer wall of the second insulating member 40 away from the electrode terminal 50 are respectively provided with the second exhaust groove 41, and whether the second exhaust groove 41 is arranged on the inner wall of the second insulating member 40 or the outer wall of the second insulating member 40, both ends of the second exhaust groove 41 pass through the accommodation space 61 and the outside. In this way, helium gas can flow smoothly from the side of the shell cover 30 filled with helium gas to the side of the detection helium gas, thereby improving the success rate of detecting the missing sealing ring 62 when detecting the air tightness of some end cover modules missing the sealing ring 62, and reducing the possibility of abnormal end cover modules flowing out. Figures 8 to 10 Figure 11 Figure 12 In some embodiments, as shown in FIG. 1, the second exhaust groove 41 is arranged on the inner wall of the second insulating member 40 facing the electrode terminal 50, and both ends of the second exhaust groove 41 pass through the accommodation space 61 and the outside. In this embodiment, the second insulating member 40 is provided with a clamping space 42, and the end of the electrode terminal 50 away from the accommodation space 21 is clamped and fixed in the clamping space 42 and covers the second exhaust groove 41. At this time, the outer contour projection of the end of the electrode terminal 50 away from the accommodation space 21 along the first direction X covers the projection of the first through hole 311 along the first direction X. Alternatively, in other embodiments, as shown in FIG. 2, the second exhaust groove 41 is arranged on the outer wall of the second insulating member 40 away from the electrode terminal 50, and both ends of the second exhaust groove 41 pass through the accommodation space 61 and the outside. In this embodiment, the second insulating member 40 is provided with a clamping space 42, and the end of the electrode terminal 50 away from the accommodation space 21 is clamped and fixed in the clamping space 42. At this time, the outer diameter of the end of the electrode terminal 50 away from the accommodation space 21 is substantially equal to the hole diameter of the first through hole 311. Alternatively, in still other embodiments, the inner wall of the second insulating member 40 facing the electrode terminal 50 and the outer wall of the second insulating member 40 away from the electrode terminal 50 are respectively provided with the second exhaust groove 41, and whether the second exhaust groove 41 is arranged on the inner wall of the second insulating member 40 or the outer wall of the second insulating member 40, both ends of the second exhaust groove 41 pass through the accommodation space 61 and the outside. In this way, helium gas can flow smoothly from the side of the shell cover 30 filled with helium gas to the side of the detection helium gas, thereby improving the success rate of detecting the missing sealing ring 62 when detecting the air tightness of some end cover modules missing the sealing ring 62, and reducing the possibility of abnormal end cover modules flowing out.

[0082] In some embodiments, as shown in FIG. 1, the second exhaust groove 41 is arranged on the inner wall of the second insulating member 40 facing the electrode terminal 50, and both ends of the second exhaust groove 41 pass through the accommodation space 61 and the outside. In this embodiment, the second insulating member 40 is provided with a clamping space 42, and the end of the electrode terminal 50 away from the accommodation space 21 is clamped and fixed in the clamping space 42 and covers the second exhaust groove 41. At this time, the outer contour projection of the end of the electrode terminal 50 away from the accommodation space 21 along the first direction X covers the projection of the first through hole 311 along the first direction X. Alternatively, in other embodiments, as shown in FIG. 2, the second exhaust groove 41 is arranged on the outer wall of the second insulating member 40 away from the electrode terminal 50, and both ends of the second exhaust groove 41 pass through the accommodation space 61 and the outside. In this embodiment, the second insulating member 40 is provided with a clamping space 42, and the end of the electrode terminal 50 away from the accommodation space 21 is clamped and fixed in the clamping space 42. At this time, the outer diameter of the end of the electrode terminal 50 away from the accommodation space 21 is substantially equal to the hole diameter of the first through hole 311. Alternatively, in still other embodiments, the inner wall of the second insulating member 40 facing the electrode terminal 50 and the outer wall of the second insulating member 40 away from the electrode terminal 50 are respectively provided with the second exhaust groove 41, and whether the second exhaust groove 41 is arranged on the inner wall of the second insulating member 40 or the outer wall of the second insulating member 40, both ends of the second exhaust groove 41 pass through the accommodation space 61 and the outside. In this way, helium gas can flow smoothly from the side of the shell cover 30 filled with helium gas to the side of the detection helium gas, thereby improving the success rate of detecting the missing sealing ring 62 when detecting the air tightness of some end cover modules missing the sealing ring 62, and reducing the possibility of abnormal end cover modules flowing out. Figures 8 to 12

[0083] ​​​In some embodiments, the depth of the venting groove is 0.1mm-1.0mm. That is, the depth of the first venting groove 321 is 0.1mm-1.0mm, and / or the depth of the second venting groove 41 is 0.1mm-1.0mm. Thus, the first venting groove 321 provided on the first insulating member 32 has a minimal impact on the structural strength of the first insulating member 32, ensuring the structural strength of the first insulating member 32 while allowing helium gas to flow smoothly from the helium-filled side to the receiving space 61 through the first venting groove 321. And / or, the second venting groove 41 provided on the second insulating member 40 has a minimal impact on the structural strength of the second insulating member 40, ensuring the structural strength of the second insulating member 40 while allowing helium gas in the receiving space 61 to flow smoothly to the outside through the second venting groove 41. This improves the success rate of detecting a missing sealing ring 62 and reduces the possibility of abnormal end cap modules leaking out.

[0084] In the embodiments of this application, the first insulating member 32 is provided with a first venting groove 321, and the second insulating member 40 is provided with a second venting groove 41. The two ends of the first venting groove 321 respectively extend to the receiving space 21 and the receiving space 61, and the two ends of the second venting groove 41 respectively extend to the receiving space 61 and the outside. Thus, when performing airtightness testing on end cap modules with missing sealing rings 62, helium is filled into the helium-filled side of the cover 30. The helium can flow smoothly along the first venting groove 321 to the receiving space 61, and then the helium reaching the receiving space 61 continues to flow smoothly along the second venting groove 41 to the outside (i.e., the side with the detected helium). This improves the flowability of the detection gas between the two sides of the cover 30, thereby improving the effectiveness of the airtightness test, increasing the success rate of detecting missing sealing rings 62, and reducing the possibility of abnormal end cap modules leaking out.

[0085] According to a second aspect of the embodiments of this application, embodiments of this application also provide a battery device 200, such as... Figure 13 As shown, the battery device 200 includes a main body 201, a cover 202, and multiple battery cells 100 as described above. The cover 202 closes onto the open end of the main body 201, forming an assembly space 203. Multiple battery cells 100 are arrayed and assembled within the assembly space 203. The battery cells 100 are used for storing electrical energy or supplying power.

[0086] The battery cell 100 provided by the embodiments of the present application can be a secondary battery, which refers to a battery cell 100 that can be activated by charging after discharging. The battery cell 100 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto. In addition, the battery cell 100 provided by the embodiments of the present application can be a square battery cell, also known as a square cell. Of course, the battery cell 100 can also be a cylindrical battery cell, also known as a cylindrical cell.

[0087] As shown in Figures 1 to 4 , Figure 6 , Figure 8 and Figure 11 , the electrode terminal 50 and the pressure relief mechanism 51 are both arranged on the shell cover 30. Specifically, the shell cover 30 is provided with a passage 510 for mounting the pressure relief mechanism 51, and the pressure relief mechanism 51 is mounted in the passage 510, so that the passage 510 is in a normally closed state, wherein the passage 510 is arranged apart from the exhaust groove. In the embodiments of the present application, the pressure relief mechanism 51 refers to an element or component that is actuated to release the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold. Wherein, "actuated" refers to the pressure relief mechanism 51 generating an action to open the passage 510, so that the internal pressure and temperature of the battery cell 100 can be released. The action generated by the pressure relief mechanism 51 can include but is not limited to at least one of the following: the pressure relief mechanism 51 is broken, torn or melted, etc. After the pressure relief mechanism 51 is actuated, the high-temperature smoke in the battery cell 100 will be discharged outward from the pressure relief mechanism 51. The predetermined threshold can be adjusted according to different design requirements. The predetermined threshold can depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte and the separator in the battery cell 100. The pressure relief mechanism 51 can use elements or components that are sensitive to pressure or temperature, i.e., when the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold, the pressure relief mechanism 51 is actuated, thereby forming a passage 510 for the internal pressure to be released.

[0088] In addition, the battery cell 100 of the present application is generally installed in the assembly space 203 in a normal manner, wherein the "normal manner" refers to the electrode terminal 50 and the pressure relief mechanism 51 both being arranged towards the box cover 202. Of course, the battery cell 100 of the present application can also be installed in the assembly space 203 in an inverted manner, wherein the "inverted manner" is opposite to the "normal manner", i.e., the electrode terminal 50 and the pressure relief mechanism 51 are both arranged towards the bottom of the box main body 201.

[0089] According to a third aspect of the embodiments of this application, embodiments of this application also provide an energy storage device 300. In some embodiments, the energy storage device 300 includes a battery device 200 as described above, that is, the energy storage device 300 uses one battery device 200 or multiple battery devices 200 connected in series, parallel, or in a mixed configuration, such that these battery devices 200 are used to store electrical energy or provide electrical energy. In other embodiments of this application, the energy storage device 300 includes a plurality of battery cells 100 as described above, that is, the energy storage device 300 uses a plurality of battery cells 100 connected in series, parallel, or in a mixed configuration, such that these battery cells 100 are used to store electrical energy or provide electrical energy.

[0090] The energy storage device 300 can be a small, portable device, such as a convenient energy storage battery used for outdoor tourism and camping, or a portable energy storage battery used by street vendors. The energy storage device 300 can also be a large, fixed, high-power industrial-grade device, such as a large energy storage power station used in a power plant. The energy storage device 300 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device 300 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 300 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Other examples include independent power supply energy storage cabinets or energy storage containers used on construction sites or in factories, and larger, portable energy storage cabinets or energy storage containers used at large event venues.

[0091] like Figure 14 As shown, the energy storage device 300 provided in the embodiments of this application is preferably an energy storage cabinet, which includes a cabinet 301 and a plurality of battery devices 200, which are stacked and assembled in the cabinet 301.

[0092] In some embodiments, the energy storage device 300 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0093] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery cell 100 or each battery device 200 via pipelines for regulating the temperature of the battery cell 100.

[0094] As an example, the master module can be used as a battery management unit of the plurality of battery cells 100 or the plurality of battery devices 200, for monitoring and managing the plurality of battery cells 100 or the plurality of battery devices 200. The master module can monitor information such as current, voltage, power or temperature of the plurality of battery cells 100 or the plurality of battery devices 200. For example, the charging and discharging current, voltage, etc. of the plurality of battery cells 100 or the plurality of battery devices 200 can be controlled. The master module includes a slave battery management unit SBMU, a fusion switch and other modules.

[0095] As an example, the master module can be used as a battery management unit of the plurality of battery cells 100 or the plurality of battery devices 200, for monitoring and managing the plurality of battery cells 100 or the plurality of battery devices 200. The master module can monitor information such as current, voltage, power or temperature of the plurality of battery cells 100 or the plurality of battery devices 200. For example, the charging and discharging current, voltage, etc. of the plurality of battery cells 100 or the plurality of battery devices 200 can be controlled. The master module includes a slave battery management unit SBMU, a fusion switch and other modules.

[0096] As an example, the fire control module includes a control panel, a detector, an alarm device, etc., for detecting, alarming or extinguishing the energy storage device 300.

[0097] As an example, the power distribution module can be used to distribute power to the modules that need power in the energy storage device 300.

[0098] According to a fourth aspect of embodiments of the present application, the embodiments of the present application also provide an energy storage system. The energy storage system includes a power conversion device and the energy storage device 300 as described above, and the power conversion device is electrically connected between the power generation device and the energy storage device 300, wherein the battery device 200 in the energy storage device 300 is used to store or provide electric energy.

[0099] In addition, the energy storage system can include one or more power conversion devices (PCS). The power generation equipment is used to generate electric energy, and the electric energy generated by the power generation equipment can be stored in the energy storage device (or the battery device 200, or the battery cell 100) through the power conversion device. As an example, the power generation equipment can be a solar panel, a water power generation equipment, a fire power generation equipment, a wind power generation equipment, etc. The specific type of the power generation equipment is not limited in the present application.

[0100] According to a fifth aspect of the embodiments of the present application, the embodiments of the present application further provide a charging grid comprising the charging pile.

[0101] In some embodiments, the charging grid further comprises the energy storage system as described above, and the charging pile is electrically connected with the energy storage system, wherein the battery device 200 of the energy storage device 300 of the energy storage system is configured to store electric energy, or the battery device 200 of the energy storage device 300 of the energy storage system is configured to provide electric energy for the charging pile.

[0102] In some embodiments, the charging grid further comprises the energy storage device 300 as described above, and the charging pile is electrically connected with the energy storage device 300, wherein the battery device 200 of the energy storage device 300 is configured to store electric energy, or the battery device 200 of the energy storage device 300 is configured to provide electric energy for the charging pile.

[0103] The charging pile can have one or more connectors, which are configured to be connected with the charging interface of the device to be charged (e.g. an electric vehicle), so as to charge the energy storage unit (e.g. the battery of an electric vehicle) of the device to be charged.

[0104] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: Electrode assembly, with tabs; Shell body; A cover, which is closed with the shell body to form an accommodating space, wherein the electrode assembly is disposed in the accommodating space, the cover includes a cover body and a first insulating member, the first insulating member is disposed on the side of the cover body facing the shell body, the cover body is provided with a first through hole, the first insulating member is provided with a second through hole, and the first through hole and the second through hole are directly opposite each other; A second insulating element is at least partially disposed within the first through hole; An electrode terminal is disposed in the second insulating member, the first through hole and the second through hole. The end face of the second insulating member facing the shell body, a portion of the hole wall of the first through hole, a portion of the hole wall of the second through hole and the side wall of the electrode terminal form a receiving space for accommodating the sealing ring. The electrode terminal is electrically connected to the tab. Wherein, at least one of the first insulating member and the second insulating member is provided with an exhaust groove, the exhaust groove being connected to the receiving space and the receiving space; Furthermore, the battery cell also includes a pressure relief mechanism, the casing has a channel, the pressure relief mechanism is installed in the channel, and the channel is spaced apart from the venting groove.

2. The battery cell according to claim 1, characterized in that, The first insulating member is provided with a first venting groove, one end of the first venting groove extends through the receiving space, and the other end of the first venting groove extends through the receiving space.

3. The battery cell according to claim 2, characterized in that, The first vent groove is located on the side of the first insulating member facing the cover; and / or, the first vent groove is located on the side of the first insulating member away from the cover, and the first vent groove is covered by the electrode terminal.

4. The battery cell according to claim 2, characterized in that, The first insulating member has a slot on the side facing the receiving space, the second through hole connects to the slot, the first exhaust groove is provided on the groove wall of the slot, and the end of the electrode terminal facing the receiving space is snapped and fixed to the slot and covers the first exhaust groove.

5. The battery cell according to claim 2, characterized in that, There are multiple first exhaust grooves, which are distributed circumferentially around the second through hole.

6. The battery cell according to any one of claims 1-5, characterized in that, The second insulating member is provided with a second venting groove, one end of which extends through the receiving space, and the other end of which communicates with the outside.

7. The battery cell according to claim 6, characterized in that, The other end of the second vent groove extends to the outside of the second insulating member on the side away from the first insulating member.

8. The battery cell according to claim 7, characterized in that, The second vent groove is located on the inner wall of the second insulating member facing the electrode terminal; and / or, the second vent groove is located on the outer wall of the second insulating member away from the electrode terminal.

9. The battery cell according to claim 6, characterized in that, The number of the second exhaust grooves is multiple, and the multiple second exhaust grooves are circumferentially spaced around the central axis of the second insulating member.

10. The battery cell according to claim 1, characterized in that, The depth of the exhaust groove is 0.1mm-1.0mm.

11. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-10.

12. An energy storage device, characterized in that, The energy storage device includes a single battery cell as described in any one of claims 1-10; Alternatively, the energy storage device may include the battery device as described in claim 11.

13. An energy storage system, characterized in that, include: Power conversion device; as well as, The energy storage device as claimed in claim 12, wherein the power conversion device is electrically connected between the power generation device and the energy storage device.

14. A charging grid, characterized in that, Including charging stations; The charging grid further includes the energy storage device as described in claim 12, wherein the charging pile is electrically connected to the energy storage device; Alternatively, the charging grid may further include the energy storage system as described in claim 13, wherein the charging pile is electrically connected to the energy storage system.

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