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

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 network. The battery monomer comprises a shell, an electrode assembly and a switching structure, the shell comprises a shell main body and at least one end cover, the end cover covers the shell main body along a first direction, the end cover is provided with an electrode terminal, the electrode assembly is accommodated in an accommodating space of the shell main body, and the electrode assembly comprises a main body part and a tab electrically connected with the main body part; the tab is arranged on at least one side of the main body part along the second direction, the switching structure comprises a first section and a second section which are connected, the first section is electrically connected with the electrode terminal, the second section is provided with an over-current section and an extension section which are connected, one end, far away from the extension section, of the over-current section is connected with the first section, the over-current section is electrically connected with the tab, and the extension section is arranged in a subtractive manner. By applying the technical scheme, the problem that the total cost of the battery monomer is relatively high due to the fact that the part, welded with the tab, of the switching structure in the battery monomer adopts a structural form of reserving redundant materials 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 network. BACKGROUND

[0002] In the battery monomer, the electrode assembly and the electrode terminal are generally connected through a switching structure.

[0003] The switching structure and the tab of the electrode assembly are welded. In order to make the switching structure and the tab be stably welded, the current switching structure adopts a structure form of reserving redundant materials for the part welded with the tab, so that the part of the switching structure welded with the tab can completely cover the tab, thereby improving the welding area of the switching structure and the tab and improving the welding quality between the switching structure and the tab.

[0004] However, when the battery monomer is mass-produced, the part of the switching structure welded with the tab adopts the structure form of reserving redundant materials, which causes the overall cost of the switching structure to be high, and in turn causes the overall cost of the battery monomer to be high. CONTENT OF THE UTILITY MODEL

[0005] The application aims to provide a battery monomer, a battery device, an energy storage device, an energy storage system and a charging network, and aims to solve the problem that the part of the switching structure welded with the tab adopts the structure form of reserving redundant materials, which causes the overall cost of the battery monomer to be high.

[0006] To achieve the above-mentioned purpose, according to the first aspect of the embodiment of the application, a battery monomer is provided, which comprises a shell, an electrode assembly and a switching structure. The shell has a top end wall and a bottom end wall along a first direction. An electrode terminal is arranged on the top end wall and / or the bottom end wall. The electrode assembly is accommodated in a containing space of the shell. The electrode assembly comprises a main body part and a tab electrically connected with the main body part. The switching structure comprises a first segment and a second segment connected with each other. The first segment is electrically connected with the electrode terminal. The second segment is electrically connected with the tab. The second segment has a flow-through segment and an extension segment connected with each other. The flow-through segment is connected with the first segment at one end away from the extension segment. The flow-through segment is electrically connected with the tab. The extension segment is provided by subtractive processing.

[0007] The battery cell provided by the embodiments of the present application has an electrode assembly with at least one side tab design, i.e., a single-sided or double-sided tab electrode assembly, and the electrode tab of the electrode assembly needs to be connected to the electrode terminal on the shell through an adapter structure. The adapter structure used by the battery cell is provided in the form of a structure with a first segment and a second segment connected to each other, the first segment is electrically connected to the electrode terminal, and the second segment has a current passing segment and an extension segment connected to each other, and the current passing segment is electrically connected to the electrode tab. In the adapter structure, the first segment and the second segment are bent to fit into the accommodation space, wherein the current passing segment of the second segment and the first segment are current passing portions of the adapter structure, and the extension segment is a non-current passing portion of the adapter structure. Compared with the current adapter structure used by the battery cell, the extension segment of the adapter structure of the battery cell is provided by subtractive processing, which can reduce the material usage of the adapter structure, especially in the large-scale production of the battery cell, which can significantly reduce the overall material usage of the adapter structure, thereby achieving the purpose of reducing the production cost of the battery cell, and improving the market competitiveness of the battery cell.

[0008] In some embodiments, the shell includes a shell body and at least one end cover, the end cover is covered on the shell body along a first direction, the electrode terminal is provided on the end cover, and the electrode tab is provided on at least one side of the main body part along a second direction, the first direction and the second direction are perpendicular, the first segment extends along the second direction, the second segment extends along the first direction, and the part of the second segment from the side of the electrode tab away from the end cover to the end of the adapter structure away from the end cover is the extension segment. The electrode assembly of the battery cell has at least one side tab design, i.e., a single-sided or double-sided tab electrode assembly, and the electrode tab of the electrode assembly needs to be connected to the electrode terminal on the end cover through an adapter structure. The adapter structure used by the battery cell is provided in the form of a structure with a first segment and a second segment connected to each other, the first segment is electrically connected to the electrode terminal, and the current passing segment of the second segment is electrically connected to the electrode tab of the electrode assembly. In the adapter structure, the first segment and the second segment are bent in an L shape to fit into the corner position of the main body part of the electrode assembly to fit into the accommodation space, wherein the current passing segment of the second segment and the first segment are current passing portions of the adapter structure, and the extension segment of the second segment is a non-current passing portion of the adapter structure. Compared with the current adapter structure used by the battery cell, the extension segment of the adapter structure of the battery cell is provided by subtractive processing, which can reduce the material usage of the adapter structure, especially in the large-scale production of the battery cell, which can significantly reduce the overall material usage of the adapter structure, thereby achieving the purpose of reducing the production cost of the battery cell, and improving the market competitiveness of the battery cell.

[0009] In some embodiments, the extension segment is completely cut. The adapter structure basically does not reserve redundant materials, improves the material utilization efficiency of the adapter structure, and reduces the cost of preparing the adapter structure.

[0010] In some embodiments, the extension section is cut to form at least one positioning arm, the size of the positioning arm in the second direction is not greater than the size of the flow-through section, and the positioning arm is used for positioning connection with the first welding positioning structure. In some embodiments, the extension section is cut to form two positioning arms parallel in the second direction, and the two positioning arms are used for positioning connection with the second welding positioning structure; and / or, the extension section is subtractively formed to form a positioning groove, the size of the positioning groove in the third direction is smaller than the size of the flow-through section, and the positioning groove is used for positioning connection with the third welding positioning structure. Most of the material of the extension section is cut off, reducing the redundant material on the adapter structure, and reducing the overall cost of the adapter structure. Moreover, the second section of the adapter structure is formed with a positioning structure (i.e., a positioning arm or a positioning groove), and the relative position between the second section and the tab is always relatively stable during the welding process through the positioning structure, which is beneficial to improve the welding quality, reduce the contact resistance between the second section and the tab after the welding is completed, reduce the ohmic heat generated by the adapter structure during the charging and discharging work cycle of the battery monomer, and improve the overall energy conversion efficiency (RTE) of the battery monomer.

[0011] In some embodiments, the opening size of the positioning groove gradually decreases in the direction close to the flow-through section. In this way, the third welding positioning structure can be easily detached from the positioning groove.

[0012] In some embodiments, the end of the positioning groove away from the flow-through section is formed with a guide camber. The third welding positioning structure is guided by the guide camber, so that the third welding positioning structure is quickly and accurately embedded in the positioning groove, thereby quickly and accurately completing the positioning assembly.

[0013] In some embodiments, the positioning arm has a side wall flush with the side wall of the flow-through section in the second direction.

[0014] In some embodiments, the tab includes an anode tab and a cathode tab, the anode tab and the cathode tab are respectively located on both sides of the main body portion in the second direction, the number of adapter structures is two, and the two adapter structures are respectively and one-to-one electrically connected with the anode tab and the cathode tab.

[0015] In some embodiments, the electrode terminal includes a positive electrode terminal and a negative electrode terminal, the positive electrode terminal and the negative electrode terminal are arranged in the same end cover, the cathode tab is electrically connected to the positive electrode terminal through one of the adapter structures, and the anode tab is electrically connected to the negative electrode terminal through the other adapter structure. The main body portion has a first median plane, the first median plane is perpendicular to the second direction, the two adapter structures are symmetrically arranged relative to the first median plane, and the anode tab and the cathode tab are arranged close to the end cover. The anode tab and the cathode tab of the present embodiment can be manufactured by blanking with the same die, which can reduce the cost of the die and thus reduce the overall production cost of the battery monomer. Moreover, since the anode tab and the cathode tab are arranged close to the end cover, that is, the distance between the anode tab and the negative electrode terminal is minimized, and the distance between the cathode tab and the positive electrode terminal is minimized, the overall length of the adapter structure is reduced, that is, the overall material usage of the adapter structure is reduced, the material cost of manufacturing the adapter structure is reduced, and thus the overall production cost of the battery monomer is reduced.

[0016] In some embodiments, the main body portion further has a second median plane, the second median plane is perpendicular to the thickness direction of the main body portion, the anode tab and the cathode tab each include a first tab portion and a second tab portion, the first tab portion and the second tab portion are arranged staggered along the first direction, and the first tab portion and the second tab portion are each arranged bent towards the second median plane. The overcurrent section of the adapter structure electrically connected to the cathode tab covers and is welded to the first tab portion and the second tab portion of the cathode tab, and the overcurrent section of the adapter structure electrically connected to the anode tab covers and is welded to the first tab portion and the second tab portion of the anode tab. Since the first tab portion and the second tab portion of the anode tab and the cathode tab are each bent towards the second median plane, the entire anode tab and the entire cathode tab can be kept flat, and the anode tab and the cathode tab can be welded after being in good contact with the corresponding adapter structure, thereby improving the welding quality and reducing the contact impedance between the tab and the adapter structure. Moreover, there is no blank area on the section of the adapter structure welded to the tab, that is, the width of the welding area is increased along the thickness direction of the main body portion. Thus, compared with the current welding of the tab and the adapter structure, the present embodiment can reduce the length of the welding area along the first direction on the basis of keeping the area of the welding area between the tab and the adapter structure unchanged, that is, reduce the length of the second section, further reduce the overall material usage of the adapter structure, reduce the cost of manufacturing the adapter structure, and thus reduce the overall production cost of the battery monomer.

[0017] In some embodiments, the battery monomer further includes a first insulating film arranged between the tab and the main body portion to insulate the tab from the main body portion. The first insulating film improves the insulation reliability between the tab and the main body portion.

[0018] In some embodiments, the first insulating film is arranged to match the projection of the tab along the second direction. The insulating film is arranged to match the size of the projection of the first tab portion and the second tab portion along the second direction, so as to ensure that the anode tab and the cathode tab are both insulated from the main body. This can reduce the amount of material used for the insulating film, while ensuring reliable insulation and reducing the cost of the insulating film, thereby further reducing the overall production cost of the battery cell.

[0019] In some embodiments, the battery cell further comprises a second insulating film arranged on the surface of the adapter structure close to the main body, so as to insulate the adapter structure from the main body. The second insulating film improves the reliability of the insulation between the adapter structure and the main body.

[0020] In some embodiments, the adapter structure electrically connected to the cathode tab is made of aluminum; and / or the adapter structure electrically connected to the anode tab is made of copper.

[0021] In some embodiments, the tab includes an anode tab and a cathode tab, the anode tab and the cathode tab are both located on the same side of the main body along the second direction, the housing includes two end covers, the two end covers are respectively arranged on the two ends of the main body, the electrode terminal includes a positive electrode terminal and a negative electrode terminal, the positive electrode terminal and the negative electrode terminal are respectively arranged on the two end covers, the number of adapter structures is two, the cathode tab is electrically connected to the positive electrode terminal through one of the adapter structures, and the anode tab is electrically connected to the negative electrode terminal through the other adapter structure. The main body has a third median surface perpendicular to the first direction, the two adapter structures are symmetrically arranged relative to the third median surface, and the anode tab is arranged close to the end cover provided with the negative electrode terminal, and the cathode tab is arranged close to the end cover provided with the positive electrode terminal. The anode tab and the cathode tab of the present embodiment can be manufactured by punching with the same die, which can reduce the cost of the die and thus the overall production cost of the battery cell. Moreover, since the anode tab and the cathode tab are both arranged close to the end cover, that is, the distance between the anode tab and the negative electrode terminal is minimized, and the distance between the cathode tab and the positive electrode terminal is minimized, the overall length of the adapter structure is reduced, that is, the overall amount of material used for the adapter structure is reduced, the material cost of manufacturing the adapter structure is reduced, and thus the overall production cost of the battery cell is reduced.

[0022] According to a second aspect of embodiments of the present application, a battery device is provided. The battery device includes the battery cell as described above, and the battery cell is used to store or provide electrical energy.

[0023] According to a third aspect of embodiments of the present application, an energy storage device is provided. The energy storage device includes the battery cell as described above, or the energy storage device includes the battery device as described above.

[0024] According to a fourth aspect of the embodiments of the present application, a power storage system is provided. Wherein, the power storage system comprises a power storage converter and a power storage device as aforementioned, the power storage converter is electrically connected with the power storage device.

[0025] According to a fifth aspect of the embodiments of the present application, a charging network is provided. Wherein, the charging network comprises a power storage device as aforementioned; or, the charging network comprises a power storage system as aforementioned. 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 perspective view of a battery cell of the embodiments of the present application is shown;

[0028] Figure 2 A perspective view of a battery cell of the embodiments of the present application is shown; Figure 1 An exploded view of the battery cell is shown;

[0029] Figure 3 A front view of an electrode assembly of the battery cell of the embodiments of the present application is shown;

[0030] Figure 4 A front view of an electrode assembly of the battery cell of the embodiments of the present application is shown; Figure 3 A left view of the electrode assembly is shown;

[0031] Figure 5 A structure view of an insulating film of the battery cell of the embodiments of the present application is shown;

[0032] Figure 6 A perspective view of an adapter structure of the battery cell of the embodiments of the present application is shown;

[0033] Figure 7 A front view of the adapter structure of the battery cell of the embodiments of the present application is shown; Figure 6 A front view of the adapter structure of the battery cell of the embodiments of the present application is shown;

[0034] Figure 8 A left view of the adapter structure of the battery cell of the embodiments of the present application is shown; Figure 7 A left view of the adapter structure of the battery cell of the embodiments of the present application is shown;

[0035] Figure 9 An exploded view of the electrode assembly, two adapter structures and a second welding positioning structure of the battery cell of the embodiments of the present application is shown;

[0036] Figure 10A perspective view of another adapter structure of a battery cell according to an embodiment of the present application;

[0037] Figure 11 A perspective view of another adapter structure of a battery cell according to an embodiment of the present application; Figure 10 A front view of the adapter structure shown;

[0038] Figure 12 A perspective view of another adapter structure of a battery cell according to an embodiment of the present application; Figure 11 A right view of the adapter structure shown;

[0039] Figure 13 An exploded view of an electrode assembly, two adapter structures and a first welding positioning structure in a battery cell according to an embodiment of the present application;

[0040] Figure 14 A perspective view of another adapter structure of a battery cell according to an embodiment of the present application;

[0041] Figure 15 A perspective view of another adapter structure of a battery cell according to an embodiment of the present application; Figure 14 A front view of the adapter structure shown;

[0042] Figure 16 A perspective view of another adapter structure of a battery cell according to an embodiment of the present application; Figure 15 A left view of the adapter structure shown;

[0043] Figure 17 An exploded view of an electrode assembly, two adapter structures and a third welding positioning structure in a battery cell according to an embodiment of the present application;

[0044] Figure 18 A front view of another electrode assembly of a battery according to an embodiment of the present application;

[0045] Figure 19 An exploded view of a battery device according to an embodiment of the present application;

[0046] Figure 20 A structural view of an energy storage device according to an embodiment of the present application;

[0047] Figure 21 A structural view of an energy storage system according to an embodiment of the present application;

[0048] Figure 22 A structural view of a charging network according to an embodiment of the present application.

[0049] In the drawings, reference numerals are consistently used throughout the drawings:

[0050] 100, battery cell;

[0051] 10, housing; 11, housing main body; 111, accommodation space; 12, end cap; 13, electrode terminal; 131, positive electrode terminal; 132, negative electrode terminal;

[0052] 20, electrode assembly; 21, main body portion; 211, first centering surface; 212, second centering surface; 213, third centering surface; 22, tab; 221, anode tab; 222, cathode tab; 223, first tab portion; 224, second tab portion;

[0053] 30, adapter structure; 31, first section; 32, second section; 320, flow-through section; 321, extension section; 322, positioning arm; 323, positioning recess;

[0054] 41, first welding positioning structure; 42, second welding positioning structure; 43, third welding positioning structure;

[0055] 51, first insulating film; 52, second insulating film;

[0056] 200, battery device; 201, case main body; 202, case lid; 203, assembly space;

[0057] 300, energy storage device; 310, case;

[0058] 400, energy storage system; 410, energy storage inverter; 420, power generation device;

[0059] 500, charging network; 510, charging pile. DETAILED DESCRIPTION

[0060] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0061] In the description of the present application, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship 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 therefore cannot be understood as indicating or implying 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.

[0062] In addition, the terms "first", "second", and the like are used only for descriptive purposes, and cannot be construed as indicating or implying relative importance or an indicated number of the technical features. Therefore, the features defined as "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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0063] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "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.

[0064] 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 (the battery device of such application is generally referred to as power battery). With the continuous expansion of the application field of battery device, the market demand is also increasing, and the manufacturing cost of battery device and the battery cell used by it still has the possibility of optimization and reduction.

[0065] In the related art, the electrode assembly of the battery cell and the electrode terminal are generally connected through a switching structure.

[0066] The switching structure and the tab of the electrode assembly are welded. In order to make the switching structure and the tab be welded stably, for this purpose, the current switching structure adopts the structure form of reserving redundant material for the part welded with the tab, so that the part of the switching structure welded with the tab can completely cover the tab, thereby increasing the welding area of the switching structure and the tab, and improving the welding quality between the switching structure and the tab.

[0067] However, in the mass production of battery cells, due to the structure form of reserving redundant material for the part of the switching structure welded with the tab, the overall cost of the switching structure is relatively high, which in turn leads to the overall cost of the battery cell being relatively high.

[0068] Based on the above considerations, embodiments of this application provide a battery cell with an electrode assembly that has at least one tab on one side, i.e., a single-sided or double-sided tab electrode assembly. The tabs of the electrode assembly are connected to the electrode terminals on the casing via an adapter structure. The adapter structure used in this battery cell is configured as a connected first and second segment. The first segment is electrically connected to the electrode terminals, and the second segment has a connected current-carrying segment and an extension segment. The current-carrying segment is electrically connected to the tabs of the electrode assembly. In this adapter structure, the first and second segments are bent to adapt for fitting into a receiving space. The current-carrying segment of the second segment and the first segment constitute the current-carrying portion of the adapter structure, while the extension segment is the non-current-carrying portion of the adapter structure. Compared to the adapter structure used in current battery cells, this battery cell's adapter structure uses a subtractive material design for the extension segment, thus reducing the material usage of the adapter structure. This is particularly significant in the mass production of battery cells, significantly reducing the overall material usage of the adapter structure, thereby reducing the production cost of the battery cell and improving its market competitiveness.

[0069] To illustrate the technical solutions provided by the embodiments of this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0070] Explanation: such as Figure 1 The spatial rectangular coordinate system XYZ is shown, where the positive and negative directions of the Z-axis represent the first direction Z, the positive and negative directions of the X-axis represent the second direction X, and the positive and negative directions of the Y-axis represent the third direction Y. The third direction Y is the thickness direction of the main body 21. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other.

[0071] According to a first aspect of the embodiments of this application, an embodiment of this application provides a battery cell 100. The battery cell 100 includes a housing 10, an electrode assembly 20, and a transition structure 30. The housing 10 has a top wall and a bottom wall along a first direction Z. Electrode terminals 13 are disposed on the top wall and / or the bottom wall. The electrode assembly 20 is housed within a receiving space 111 of the housing 10. The electrode assembly 20 includes a main body 21 and a tab 22 electrically connected to the main body 21. The transition structure 30 includes a first segment 31 and a second segment 32 connected together. The first segment 31 is electrically connected to the electrode terminal 13. The second segment 32 has a current-carrying segment 320 and an extension segment 321 connected together. The end of the current-carrying segment 320 away from the extension segment 321 is connected to the first segment 31. The current-carrying segment 320 is electrically connected to the tab 22. The extension segment 321 is provided with a subtractive material.

[0072] The battery cell 100 provided by the embodiments of the present application has an electrode assembly 20 with at least one side tab 22, i.e., a single-sided tab 22 or a double-sided tab 22, and the tab 22 of the electrode assembly 20 is connected to the electrode terminal 13 on the shell 10 through an adapter structure 30. The adapter structure 30 used in the battery cell 100 is provided in the structure of a first segment 31 and a second segment 32 connected to each other, the first segment 31 is electrically connected to the electrode terminal 13, and the second segment 32 is electrically connected to the tab 22 of the electrode assembly 20. In the adapter structure 30, the first segment 31 and the second segment 32 are bent to be fitted into the accommodation space 111, wherein the welding area of the second segment 32 to the tab 22 is an overcurrent part for current flow to the first segment 31, and the second segment 32 has an extension segment 321. Compared with the adapter structure used in the current battery cell, the adapter structure 30 of the battery cell 100 is provided with the extension segment 321 by subtractive processing, which can reduce the amount of material used in the adapter structure 30, especially in the large-scale production of the battery cell 100, which can significantly reduce the overall material usage of the adapter structure 30, thereby achieving the purpose of reducing the production cost of the battery cell 100, and improving the market competitiveness of the battery cell 100.

[0073] In some embodiments, as Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 、 Figure 10 、 Figure 11 、 Figure 14 and Figure 15As shown, the shell 10 includes a shell main body 11 having a containing space 111 and at least one end cover 12 covering the shell main body 11 along a first direction Z. Among them, the end cover 12 is the top end wall or the bottom end wall, that is, when the shell 10 includes only one end cover 12, the end cover 12 serves as the top end wall; when the shell 10 includes two end covers 12, one of the end covers 12 serves as the top end wall, and the other end cover 12 serves as the bottom end wall. The electrode terminal 13 is provided on the end cover 12. And the tab 22 is provided on at least one side of the main body part 21 along the second direction X. In the adapter structure 30, the first section 31 extends along the second direction X, and the second section 32 extends along the first direction Z. The part of the second section 32 from the side of the tab 22 away from the end cover 12 to the end of the adapter structure 30 away from the end cover 12 is the extension section 321, which is provided by subtractive manufacturing. The electrode assembly 20 of the battery monomer 100 is designed to have the tab 22 on at least one side along the second direction X, that is, the electrode assembly 20 with a single-sided tab 22 or a double-sided tab 22, and the tab 22 of the electrode assembly 20 needs to be connected to the electrode terminal 13 on the end cover 12 through the adapter structure 30. The adapter structure 30 used by the battery monomer 100 is provided in the form of a structure with a connected first section 31 and a second section 32, the first section 31 is electrically connected to the electrode terminal 13, and the second section 32 is electrically connected to the tab 22 of the electrode assembly 20. In the adapter structure 30, the first section 31 and the second section 32 are arranged in an L-shaped bending manner, which is used to adapt to the corner position of the main body part 21 of the electrode assembly 20 to fit into the containing space 111. Among them, the overcurrent section 320 of the second section 32 is the overcurrent part of the current flow in the adapter structure 30, that is, it bears the overcurrent function. Correspondingly, the extension section 321 of the second section 32 is the non-overcurrent part of the adapter structure 30, that is, the extension section 321 can not bear the overcurrent function. Compared with the current adapter structure used by the battery monomer, the extension section 321 of the adapter structure 30 of the battery monomer 100 is provided by subtractive manufacturing. Therefore, the amount of material used by the adapter structure 30 can be reduced, especially in the large-scale production of the battery monomer 100, which can significantly reduce the overall material usage of the adapter structure 30, thereby achieving the purpose of reducing the production cost of the battery monomer 100, and improving the market competitiveness of the battery monomer 100.

[0074] Among them, "subtractive" in subtractive manufacturing refers to the abbreviation of "subtractive manufacturing" (SM). Subtractive manufacturing is to "cut" a complete material into a target part through cutting, grinding, drilling and other methods. That is, "the extension section 321 is provided by subtractive manufacturing" means that the extension section 321 is cut.

[0075] In the battery cell 100, the energy conversion efficiency (RTE) is directly related to the overall performance of the battery cell 100, therefore, improving the energy conversion efficiency (RTE) means that the energy waste of the battery cell 100 in each charge and discharge working cycle can be significantly reduced, that is, the output efficiency of the effective electric energy output by the battery cell 100 is improved. When a plurality of battery cells 100 are integrated into a battery device 200, the energy loss in the connection path of each battery cell 100 becomes one of the key factors affecting the output efficiency of the battery device 200. Among them, in the battery cell 100 with single-sided tab 22 or double-sided tab 22, the adapter structure 30 is the core component for connecting the electrode terminal 13 and the electrode assembly 20 in the battery cell 100 to build a current path, by minimizing the connection resistance (including the resistance of the adapter structure 30 itself and the contact resistance between the adapter structure 30 and the electrode terminal 13, between the adapter structure 30 and the tab 22), so as to reduce the ohmic heat Q (Q=I²R) loss generated in the current loop during each charge and discharge working cycle, thereby effectively improving the overall energy conversion efficiency (RTE) of the battery cell 100. Therefore, in order to ensure the effective overcurrent capacity of the adapter structure 30, the overcurrent section 320 of the second section 32 and the overcurrent part of the first section 31 cannot be subtractively set, otherwise, the overcurrent part after subtractive setting will introduce additional impedance, which will cause the energy loss to increase significantly, and is easy to cause local overheating under the large current condition in the charge and discharge working cycle. In the adapter structure 30 used in the battery cell 100 provided in the embodiments of the present application, the second section 32 of the adapter structure 30 is subtractively set, and the current flowing through the current path formed by the electrode assembly 20, the adapter structure 30 and the electrode terminal 13 actually has no actual effect in the extension section 321, that is, the extension section 321 has no overcurrent, therefore, subtractive setting of the extension section 321 not only does not introduce additional impedance, but also reduces the material usage ratio of the extension section 321 in the adapter structure 30, that is, the overall material usage of the adapter structure 30 is reduced, thereby reducing the overall cost of the adapter structure 30, which is beneficial to reduce the overall production cost of the battery cell 100.

[0076] The aforementioned "no overcurrent in extension section 321" means that current can be supplied to the electrode assembly 20, the transition structure 30, and the electrode terminal 13 without flowing through this section, not that there is no current in this section. In reality, in the microscopic movement of electrons, electrons exist at all positions on the transition structure 30. New electrons continuously move to the transition structure 30 to replace old electrons, causing the old electrons to move along the current path formed between the electrode assembly 20, the transition structure 30, and the electrode terminal 13, thus forming a current. For extension section 321, new electrons also continuously replace the old electrons, but the electron replacement efficiency of extension section 321 is far lower than that of the overcurrent section. Therefore, extension section 321 has almost no impact on the current-carrying capacity of the transition structure 30 in the battery cell 100.

[0077] The material removed from the subtractive processing of the transition structure 30 can be recycled and reused. Then, the removed material can be used to remanufacture a new transition structure 30, which helps to reduce the overall cost of the transition structure 30.

[0078] In the embodiments of this application, the battery cell 100 can be a rechargeable battery, which refers to a battery cell 100 that can be recharged after discharge to activate the active materials and continue to be used. The battery cell 100 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this. Furthermore, the battery cell 100 provided in the embodiments of this application is a square battery cell, also called a square cell, meaning that the outer contour of the casing 10 is a cuboid. The casing 10 of the square battery cell 100 has two large sidewalls with larger surface areas, two small sidewalls with smaller surface areas, a bottom wall, and a top wall. Two large sidewalls and two small sidewalls are alternately connected to form prismatic sidewalls, which are the circumferential sidewalls of the shell body 11. The bottom wall and the top wall are located at the upper and lower ends of the prismatic sidewalls, respectively. The top wall and the bottom wall are both end caps 12, or the top wall is the end cap 12 and the bottom wall is the bottom of the shell body 11. Generally, the end cap 12, which serves as the top wall, is provided with structures such as a pressure relief mechanism and electrode terminals 13, while the bottom wall is not. This makes it easier to identify the top wall. The wall opposite the top wall is the bottom wall. The two large sidewalls and the two small sidewalls can be directly distinguished by the size of their surface areas.

[0079] In some embodiments, the extension segment 321 is cut entirely. In the present embodiment, the adapter structure 30 is substantially no longer reserved redundant material, improving the material utilization efficiency of the adapter structure 30, that is, each material of the adapter structure 30 is an effective component of the flow passage. Thus, the overall material usage of the adapter structure 30 is reduced, thereby reducing the overall cost of the adapter structure 30. Moreover, by using the laser welding process to weld the second segment 32 of the adapter structure 30 and the tab 22, the welding stability and quality between the second segment 32 and the tab 22 can be maintained, thereby reducing the contact impedance between the adapter structure 30 and the tab 22, reducing the ohmic heat generated by the adapter structure 30 during the charge and discharge working cycle of the battery monomer 100, and improving the overall energy conversion efficiency (RTE) of the battery monomer 100.

[0080] In some embodiments, the extension segment 321 is cut to form at least one positioning arm 322, and the size of the positioning arm 322 in the second direction X does not exceed the size of the flow passage segment 320, that is, most of the material of the extension segment 321 is cut off, reducing the redundant material on the adapter structure 30, that is, reducing the material usage of the adapter structure 30 and reducing the overall cost of the adapter structure 30. As shown in Figure 10 to Figure 12 , the extension segment 321 is cut to form one positioning arm 322. Moreover, the cut positioning arm 322 can be used for positioning and aligning between the second segment 32 and the tab 22, as shown in Figure 13 , the positioning arm 322 is used for positioning connection with the first welding positioning structure 41, so that the second segment 32 and the tab 22 are quickly positioned and aligned, and then the second segment 32 and the tab 22 are welded, improving the welding efficiency. Moreover, since the second segment 32 and the tab 22 are positioned by the positioning arm 322, the relative position between the second segment 32 and the tab 22 remains relatively stable during welding, which is conducive to improving the welding quality, that is, reducing the contact impedance between the second segment 32 and the tab 22 after welding is completed, reducing the ohmic heat generated by the adapter structure 30 during the charge and discharge working cycle of the battery monomer 100, and improving the overall energy conversion efficiency (RTE) of the battery monomer 100.

[0081] As shown in Figure 6 to Figure 8 , in some embodiments, the extension segment 321 is cut to form two positioning arms 322 arranged side by side in the second direction X, that is, the two positioning arms 322 arranged side by side are in the form of a U-shaped structure, which can reduce the redundant material on the adapter structure 30, that is, reduce the material usage of the adapter structure 30 and reduce the overall cost of the adapter structure 30. Moreover, the two cut positioning arms 322 can be used for positioning and aligning between the second segment 32 and the tab 22, as shown in Figure 9As shown, two positioning arms 322 are used to positionally connect with the second welding positioning structure 42, and compared with the case that one positioning arm 322 is cut out from the extension section 321, the two positioning arms 322 in parallel can make the relative position of the second section 32 relative to the tab 22 more stable, that is, the second section 32 will not be offset in position relative to the tab 22 during the welding process, so as to improve the welding quality, that is, to reduce the contact impedance of the second section 32 relative to the tab 22 after the welding is completed, to reduce the ohmic heat generated by the adapter structure 30 during the charging and discharging work cycle of the battery monomer 100, and to improve the overall energy conversion efficiency (RTE) of the battery monomer 100.

[0082] As shown, Figure 14 to Figure 16 In some embodiments, the extension section 321 is subtractively formed with a positioning groove 323, and the size of the positioning groove 323 is smaller than the size of the flow-through section 320 along the third direction Y. In this way, the redundant material on the adapter structure 30 can be reduced, that is, the amount of material used by the adapter structure 30 is reduced, and the overall cost of the adapter structure 30 is reduced. And as shown, Figure 17 The positioning groove 323 is used to positionally connect with the third welding positioning structure 43, so that the relative position between the second section 32 and the tab 22 remains relatively stable during the welding process, which is conducive to improving the welding quality, that is, to reduce the contact impedance of the second section 32 relative to the tab 22 after the welding is completed, to reduce the ohmic heat generated by the adapter structure 30 during the charging and discharging work cycle of the battery monomer 100, and to improve the overall energy conversion efficiency (RTE) of the battery monomer 100.

[0083] The first welding positioning structure 41, the second welding positioning structure 42, and the third welding positioning structure 43 can be part of a positioning jig used in the welding process. And the first welding positioning structure 41, the second welding positioning structure 42, and the third welding positioning structure 43 can be detachably mounted, so that they can be disassembled and replaced, so that they can be adapted to different positioning structures cut out from the extension section 321, and the different positioning structures can be a single positioning arm 322, two positioning arms 322 in parallel in the form of a U-shaped, a positioning groove 323, etc. And after the welding of the adapter structure 30 and the tab 22 is completed, the first welding positioning structure 41, the second welding positioning structure 42, or the third welding positioning structure 43 can be removed, and then the electrode assembly 20 and the adapter structure 30 are installed into the accommodation space 111, and then the end cover 12 is installed on the shell main body 11, and then the electrode terminal 13 and the first section 31 of the adapter structure 30 are welded, and the end cover 12 and the shell main body 11 are welded.

[0084] As shown, Figure 14 to Figure 16As shown, the opening size of the positioning groove 323 gradually decreases along the direction close to the overcurrent section 320. In this way, after the welding of the overcurrent section 320 and the tab 22 is completed, the third welding positioning structure 43 can be easily detached from the positioning groove 323, improving the assembly efficiency.

[0085] As shown in Figure 14 to Figure 16 , the end of the positioning groove 323 away from the overcurrent section 320 is formed with a guide arc surface. When positioning and installing the positioning groove 323 and the third welding positioning structure 43, the positioning groove 323 guides the third welding positioning structure 43 through the guide arc surface, so that the third welding positioning structure 43 is quickly and accurately embedded in the positioning groove 323, thereby quickly and accurately completing the positioning assembly and improving the assembly efficiency.

[0086] As shown in Figure 2 , Figure 3 , Figure 9 , Figure 13 and Figure 17 , in some embodiments, the tab 22 includes an anode tab 221 and a cathode tab 222, and the anode tab 221 and the cathode tab 222 can be respectively located on both sides of the main body part 21 along the second direction X, i.e., the electrode assembly 20 is a structure form of double-sided tab 22. And, the number of adapter structures 30 is two, and the two adapter structures 30 are respectively electrically connected with the anode tab 221 and the cathode tab 222 one by one. In the present embodiment, as shown in Figure 1 and Figure 2 , the electrode terminal 13 includes a positive electrode terminal 131 and a negative electrode terminal 132, and the positive electrode terminal 131 and the negative electrode terminal 132 can be arranged in the same end cover 12. The cathode tab 222 is electrically connected with the positive electrode terminal 131 through one of the adapter structures 30, and the anode tab 221 is electrically connected with the negative electrode terminal 132 through the other adapter structure 30, as shown in Figure 3 and Figure 18As shown, the main body 21 has a first middle surface 211 perpendicular to the second direction X, and the two adapter structures 30 are symmetrically arranged relative to the first middle surface 211. The first middle surface 211 is a plane at the middle position of the width dimension of the main body 21 along the second direction X. In this embodiment, the structural shape and the structural size of the anode tab 221 and the cathode tab 222 are the same, so the anode tab 221 and the cathode tab 222 can be manufactured by using the same die for blanking. In this way, the difference of the die for manufacturing the anode tab 221 and the cathode tab 222 can be simplified, thereby reducing the die cost and the overall production cost of the battery monomer 100. Moreover, since the anode tab 221 and the cathode tab 222 are arranged close to the end cover 12, that is, the distance between the anode tab 221 and the negative terminal 132 is minimized, and the distance between the cathode tab 222 and the positive terminal 131 is minimized, the overall length of the adapter structure 30 is reduced, that is, the overall material usage of the adapter structure 30 is reduced, thereby reducing the material cost of preparing the adapter structure 30 and the overall production cost of the battery monomer 100.

[0087] In some embodiments, for the battery monomer 100 assembled and formed by using the electrode assembly 20 with the structure of the double-sided tab 22, the positive terminal 131 and the negative terminal 132 can be arranged on the two end covers 12, respectively, that is, the shell 10 includes two end covers 12, and the two end covers 12 are respectively arranged at the two ends of the shell main body 11 along the first direction Z. Moreover, the number of the adapter structures 30 is two, and the first segments 31 of the two adapter structures 30 are respectively electrically connected to the anode tab 221 and the cathode tab 222 one by one, the cathode tab 222 is electrically connected to the positive terminal 131 through one of the adapter structures 30, and the anode tab 221 is electrically connected to the negative terminal 132 through the other adapter structure 30. In this embodiment, the two adapter structures 30 are centrally symmetrically arranged relative to the center point of the main body 21. In this embodiment, the structural shape and the structural size of the anode tab 221 and the cathode tab 222 are also the same, so the anode tab 221 and the cathode tab 222 can be manufactured by using the same die for blanking. In this way, the difference of the die for manufacturing the anode tab 221 and the cathode tab 222 can be simplified, thereby reducing the die cost and the overall production cost of the battery monomer 100. Moreover, the anode tab 221 is arranged close to the end cover 12 provided with the negative terminal 132, and the cathode tab 222 is arranged close to the end cover 12 provided with the positive terminal 131. In this way, the distance between the anode tab 221 and the negative terminal 132 is minimized, and the distance between the cathode tab 222 and the positive terminal 131 is minimized, thereby reducing the overall length of the adapter structure 30, that is, reducing the overall material usage of the adapter structure 30, thereby reducing the material cost of preparing the adapter structure 30 and the overall production cost of the battery monomer 100.

[0088] As Figure 4As shown, in some embodiments, the main body 21 further has a second middle surface 212 perpendicular to the third direction Y, the anode tab 221 and the cathode tab 222 each include a first tab portion 223 and a second tab portion 224, the first tab portion 223 and the second tab portion 224 are respectively located on two sides of the second middle surface 212, the first tab portion 223 and the second tab portion 224 are staggered in the first direction Z, the extension section 321 of the adapter structure 30 electrically connected with the cathode tab 222 covers and is welded to the first tab portion 223 and the second tab portion 224 of the cathode tab 222, and the extension section 321 of the adapter structure 30 electrically connected with the anode tab 221 covers and is welded to the first tab portion 223 and the second tab portion 224 of the anode tab 221. Wherein, the second middle surface 212 is a plane at the middle position of the thickness dimension of the main body 21 along the third direction Y. In this embodiment, the main body 21 includes a cathode tab and an anode tab in the electrode assembly 20 wound and formed, the anode tab extends out of the anode tab 221 along one side of the second direction X opposite to the large side wall, and the cathode tab extends out of the cathode tab 222 along the other side of the second direction X opposite to the large side wall. Since the first tab portion 223 and the second tab portion 224 of the anode tab 221 and the cathode tab 222 are both bent towards the second middle surface 212, the entire anode tab 221 and the entire cathode tab 222 can be kept flat, and then the anode tab 221 and the cathode tab 222 can be in good contact with the corresponding adapter structure 30 for welding, so as to improve the welding quality, reduce the contact impedance between the tab 22 and the adapter structure 30, and improve the overall energy conversion efficiency (RTE) of the battery monomer 100. Moreover, there is no blank area on the section of the adapter structure 30 welded with the tab 22, i.e. the width of the welding area is increased along the third direction Y, so that, compared with the current welding of the tab and the adapter structure, the welding area length of the tab 22 and the adapter structure 30 is reduced along the first direction Z, i.e. the length of the second section 32 is reduced, the overall material usage of the adapter structure 30 is further reduced, the cost of preparing the adapter structure 30 is reduced, and thus the overall production cost of the battery monomer 100 is reduced. Of course, in order to further ensure the small contact impedance between the adapter structure 30 and the tab 22, the welding area length is no longer reduced while the width of the welding area is increased along the third direction Y, i.e. the welding area of the tab 22 and the adapter structure 30 is increased, so as to improve the welding quality between the tab 22 and the adapter structure 30, ensure the small contact impedance between the adapter structure 30 and the tab 22, and improve the overall energy conversion efficiency (RTE) of the battery monomer 100.

[0089] In the battery cell 100, there is a very small air gap between the tab 22 and the main body 21. This air gap provides insulation between the tab 22 and the main body 21. However, when the battery cell 100 is subjected to external force, such as a collision, this air gap can be easily compressed, causing the tab 22 to contact the main body 21 and resulting in insulation failure. Therefore, insulation achieved through an air gap is not stable. Figure 4 and Figure 5 As shown, in some embodiments, the battery cell 100 further includes a first insulating film 51, which is disposed between the tab 22 and the main body 21 to insulate the tab 22 from the main body 21. Thus, the first insulating film 51 improves the insulation reliability between the tab 22 and the main body 21.

[0090] like Figure 4 and Figure 5 As shown, in some embodiments, the projection of the first insulating film 51 along the second direction X is adapted to the projection of the tab 22 along the second direction X. In this embodiment, the first insulating film 51 does not need to completely cover the side of the main body 21 opposite to the small sidewall along the second direction X. It only needs to be adapted to the size of the projection of the first tab portion 223 and the second tab portion 224 along the second direction X to ensure that the anode tab 221 and the main body 21, as well as the cathode tab 222 and the main body 21, remain insulated. This reduces the amount of material used in the first insulating film 51, ensuring reliable insulation while reducing the cost of the first insulating film 51, and further reducing the overall production cost of the battery cell 100.

[0091] In the battery cell 100, there is a small air gap between the current-carrying section 320 and the first section 31 (i.e., the current-carrying part of the transition structure 30) of the transfer structure 30 and the main body 21. This air gap allows for mutual insulation between the current-carrying part of the transfer structure 30 and the main body 21. However, when the battery cell 100 is subjected to external force, such as a collision, this air gap can be easily compressed, causing the current-carrying part of the transfer structure 30 to contact the main body 21, resulting in insulation failure. Therefore, achieving insulation through an air gap is not stable. Figure 2 , Figure 6 , Figure 8 to Figure 10 , Figure 12 to Figure 17 As shown, in some embodiments, the battery cell 100 further includes a second insulating film 52, which is disposed on the surface of the adapter structure 30 near the main body 21, i.e., the second insulating film 52 is attached and fixed to the surface of the current-passing portion of the adapter structure 30 facing the main body 21. This makes the adapter structure 30 insulated from the main body 21, and the second insulating film 52 improves the insulation reliability between the adapter structure 30 and the main body 21.

[0092] In other embodiments, such as Figure 18 As shown, the anode tab 221 and cathode tab 222 can both be located on the same side of the main body 21 along the second direction X, that is, the electrode assembly 20 has a single-sided tab 22 structure. Furthermore, there are two transition structures 30, each electrically connected to the anode tab 221 and cathode tab 222 respectively. The positive terminal 131 and negative terminal 132 can be respectively disposed on two end caps 12. In other words, the outer casing 10 includes two end caps 12, which respectively cover the two ends of the main body 11 along the first direction Z. The cathode tab 222 is electrically connected to the positive terminal 131 through one of the transition structures 30, and the anode tab 221 is electrically connected to the negative terminal 132 through the other transition structure 30. In this embodiment, the main body 21 has a third dividing surface 213, which is perpendicular to the first direction Z. The two transition structures 30 are symmetrically arranged with respect to the third dividing surface 213. The third dividing surface 213 is a plane at the midpoint of the height dimension of the main body 21 along the first direction Z. In this embodiment, the anode tab 221 and the cathode tab 222 have the same structural shape and size. Therefore, the anode tab 221 and the cathode tab 222 can be manufactured using the same die. This simplifies the difference in the dies used to manufacture the anode tab 221 and the cathode tab 222, thereby reducing die costs and the overall production cost of the battery cell 100. Furthermore, the anode tab 221 is positioned close to the end cap 12 with the negative terminal 132, and the cathode tab 222 is positioned close to the end cap 12 with the positive terminal 131. This minimizes the distance between the anode tab 221 and the negative terminal 132, and minimizes the distance between the cathode tab 222 and the positive terminal 131, thus reducing the overall length of the adapter structure 30, i.e., reducing the overall material usage of the adapter structure 30, lowering the material cost of manufacturing the adapter structure 30, and thus reducing the overall production cost of the battery cell 100.

[0093] In the electrode assembly 20, when the battery cell 100 is charged or discharged, the active material on the cathode tab, the electrolyte and the active material on the anode tab are electrochemically reacted to realize the storage or output of electric energy (i.e. to generate an output current), and the current density of the cathode tab is 20%-30% lower than that of the anode tab. Therefore, when the volume conductivity of the metal material used in the anode tab is met, the volume conductivity of the metal material used in the cathode tab can be slightly smaller than that of the metal material used in the anode tab. In the room temperature (20℃) test, the volume conductivity of the metal material from large to small is: silver, copper, gold, aluminum, calcium, sodium, molybdenum, zinc, nickel, iron, platinum, tin, lead, titanium, and the conductivity of the metal material in the front is better. Since silver and gold are precious metals, the cost factor is considered, and therefore the anode tab is preferably made of copper material, and the volume conductivity of the copper material is about 58MS*m -1 . And the volume conductivity of the aluminum material is about 37MS*m -1 Therefore, the cathode tab is made of aluminum material, which is low in cost and light in weight. The anode lug 221 is a copper connecting piece cut and formed from the copper material of the anode tab, and the cathode lug 222 is an aluminum connecting piece cut and formed from the aluminum material of the cathode tab. The adapter structure 30 needs to be welded with the lug 22. Since the same material welding has the advantages of wide process window, less solder splashing, high tensile shear strength of the welding area, etc., the adapter structure 30 electrically connected with the cathode lug 222 is made of aluminum material, and the adapter structure 30 electrically connected with the anode lug 221 is made of copper material.

[0094] Among them, the process window refers to how to play with the process parameters without damaging the product. The range of playing is the process window. The wider the window, the more "robust" the process, the higher the tolerance of the product manufacturing process to equipment fluctuations, environmental changes and material differences, and the more stable the yield of mass production of the product.

[0095] According to a second aspect of the embodiments of the present application, a battery device 200 is provided, as shown in Figure 19 . Among them, the battery device 200 includes the battery cell 100 as described above, and the battery cell 100 is used to store or provide electric energy. Generally, the battery device 200 assembled and formed by the square battery cell 100 is also square in shape, also known as a square battery, as shown in Figure 19As shown, the battery device 200 includes a main body 201, a cover 202, and a plurality of battery cells 100 as described above. The cover 202 closes to the opening end of the main body 201, and the main body 201 and the cover 202 close together to form an assembly space 203. The plurality of battery cells 100 are arrayed and assembled in the assembly space 203. The plurality of battery cells 100 are connected in series, parallel or mixed. These battery cells 100 are used to store electrical energy or provide electrical energy.

[0096] The battery device 200 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.

[0097] 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.

[0098] As an example, the main control module can serve as a battery management unit for multiple battery cells 100 or multiple battery devices 200, used to monitor and manage the multiple battery cells 100. The main control module can monitor information such as current, voltage, power, or temperature of the multiple battery cells 100. For example, it can control the charging and discharging current and voltage of the multiple battery cells 100. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0099] As an example, the central control module can serve as the battery management unit of the battery device 200, used to monitor and manage the battery device 200. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the battery device 200. For example, it can control the charging and discharging current and voltage of the battery device 200. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0100] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., for detecting, alarming, or extinguishing the battery device 200.

[0101] As an example, the power distribution module can be used to distribute power to modules in the battery device 200 that require power.

[0102] According to a third aspect of the embodiments of this application, an energy storage device 300 is provided, such as... Figure 20As shown, the energy storage device 300 can include the battery device 200 and an energy storage box 310, and the battery device 200 is arranged in the energy storage box 310.

[0103] As an example, the energy storage device 300 can be an energy storage container, an energy storage cabinet, etc.

[0104] As an example, the energy storage device 300 can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage power station can store electric energy during the low electricity consumption valley, and provide electric energy for related users or electric equipment during the electricity consumption peak. The wind turbine generator set of the wind power system can collect wind energy and convert it into electric energy, which is stored by the energy storage device 300. The solar power system can convert solar energy into electric energy, which is stored by the energy storage device 300 and supplied to users in time. The mobile power system can supply power to related electric equipment in places where the power grid power supply system cannot reach, such as remote mountainous areas, remote wild areas, etc. The temporary power supply system can supply power to users in the case of insufficient power supply.

[0105] According to a fourth aspect of the embodiments of the present application, an energy storage system 400 is provided, as shown. Figure 21 As shown, the energy storage system 400 includes an energy storage converter device 410, which can be electrically connected to a power generation device 420 to convert the electric power provided by the power generation device 420. The energy storage system 400 can also include an energy storage device 300, which is electrically connected to the energy storage converter device 410, and the energy storage converter device 410 guides the electric energy provided by the power generation device 420 to the energy storage device 300 after power conversion for storage. As an example, as shown, two power generation devices 420 transmit the generated electric energy to the energy storage converter device 410, and the energy storage converter device 410 guides the electric energy to the energy storage device 300 for storage. Figure 21

[0106] The power conversion device is used to connect between the power generation device 420 and the energy storage device 300. The power generation device 420 is used to generate electric energy, and the power generation device 420 is used to store the generated electric energy to the energy storage device 300 through the power conversion device. The energy storage system 400 applies the energy storage device 300, which can effectively improve the operation safety of the energy storage system 400. In specific implementation, the power generation equipment can be a solar panel, a hydroelectric power generation equipment, a thermal power generation equipment, etc. The specific type of power generation equipment is not limited in the present application.

[0107] According to a fifth aspect of the embodiments of the present application, a charging network 500 is provided, as shown. Figure 22 ​As shown, the charging network 500 includes a charging pile 510 for charging electrical equipment. The charging network 500 may also include an energy storage device 300, which is electrically connected to the charging pile 510 and provides power to the charging pile 510.

[0108] It should be noted that the charging pile 510 is electrically connected to the battery cells in the energy storage device 300 via cables, and the battery cells can supply the charging pile 510 with their stored electrical energy. The charging pile 510 has a connector that can be connected to electrical equipment, thereby replenishing the equipment's power. The application of the energy storage device 300 in this charging network 500 can effectively improve the safety of the charging network 500 and also help to enhance the flexibility of the charging network 500 during deployment.

[0109] In a charging network 500, there can be one charging pile 510, and the energy storage device 300 provides power to the one charging pile 510; there can also be multiple charging piles 510, and the energy storage device 300 provides power to multiple charging piles 510.

[0110] As an example, such as Figure 22 As shown, the charging network 500 includes an energy storage device 300 and two charging piles 510, with the energy storage device 300 providing power to the two charging piles 510.

[0111] The battery device 200 is electrically connected to the charging pile 510 so that the battery device 200 can provide power to the charging pile 510.

[0112] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing having a top end wall and a bottom end wall in a first direction; an electrode terminal provided on the top end wall and / or the bottom end wall; an electrode assembly accommodated in a receiving space of the housing, the electrode assembly comprising a main body portion and a tab electrically connected to the main body portion; an adapter structure comprising a first segment and a second segment connected to each other, the first segment being electrically connected to the electrode terminal, the second segment having a flow-through segment and an extension segment connected to each other, the flow-through segment being connected to the first segment at an end thereof away from the extension segment, the flow-through segment being electrically connected to the tab, and the extension segment being subtractively formed.

2. The battery cell according to claim 1, wherein the housing comprises a housing main body and at least one end cover, the end cover being coupled to the housing main body in the first direction, the electrode terminal being provided on the end cover, the tab being provided on at least one side of the main body portion in a second direction, the first direction and the second direction being perpendicular to each other, the first segment extending in the second direction, the second segment extending in the first direction, and a portion of the second segment from a side thereof away from the end cover to an end of the adapter structure away from the end cover being the extension segment.

3. The battery cell according to claim 2, wherein the extension segment is cut to form at least one positioning arm, the positioning arm having a size not exceeding that of the flow-through segment in the second direction.

4. The battery cell according to claim 3, wherein the extension segment is cut to form two positioning arms parallel to each other in the second direction; and / or the extension segment is subtractively formed to have a positioning groove, the positioning groove having a size smaller than that of the flow-through segment in a third direction, the third direction being perpendicular to each of the second direction and the first direction.

5. The battery cell according to claim 4, wherein when the extension segment is subtractively formed to have the positioning groove, an opening size of the positioning groove gradually decreases in a direction approaching the flow-through segment.

6. The battery cell according to claim 4, wherein when the extension segment is subtractively formed to have the positioning groove, an end of the positioning groove away from the flow-through segment is formed with a guide camber.

7. The battery cell according to claim 3, wherein in the second direction, the positioning arm has a side wall flush with a side wall of the flow-through segment.

8. The battery cell according to any one of claims 2-7, wherein the tab comprises an anode tab and a cathode tab, the anode tab and the cathode tab being respectively located on two sides of the main body portion in the second direction, and the number of the adapter structures is two, the two adapter structures being respectively electrically connected to the anode tab and the cathode tab one by one.

9. The battery cell according to claim 8, wherein ​ The electrode terminal includes a positive electrode terminal and a negative electrode terminal, both of which are arranged on the same end cover, the cathode tab is electrically connected to the positive electrode terminal through one of the adapter structures, and the anode tab is electrically connected to the negative electrode terminal through the other adapter structure, the main body part has a first median surface, the first median surface is perpendicular to the second direction, the two adapter structures are symmetrically arranged relative to the first median surface, and the anode tab and the cathode tab are both arranged close to the end cover.

10. The battery cell of claim 9, wherein, The main body part further has a second median surface, the second median surface is perpendicular to the thickness direction of the main body part, the anode tab and the cathode tab each include a first tab portion and a second tab portion, the first tab portion and the second tab portion are arranged staggered in a first direction, the first tab portion and the second tab portion are both arranged bent towards the second median surface, the overcurrent section of the adapter structure electrically connected to the cathode tab covers and is welded to the first tab portion and the second tab portion of the cathode tab, and the overcurrent section of the adapter structure electrically connected to the anode tab covers and is welded to the first tab portion and the second tab portion of the anode tab.

11. The battery cell of claim 8, wherein, The adapter structure electrically connected to the cathode tab is a component made of aluminum material; and / or the adapter structure electrically connected to the anode tab is a component made of copper material.

12. The battery cell of any one of claims 1-7, wherein, The battery cell further includes a first insulating film arranged between the tab and the main body part to insulate the tab and the main body part.

13. The battery cell of claim 12, wherein, The projection of the first insulating film along a second direction is adapted to the projection of the tab along the second direction, and the first direction and the second direction are perpendicular.

14. The battery cell of any one of claims 1-7, wherein, The battery cell further includes a second insulating film arranged on the surface of the adapter structure close to the main body part to insulate the adapter structure and the main body part.

15. The battery cell of any one of claims 2-7, wherein, The electrode tabs include an anode tab and a cathode tab, the anode tab and the cathode tab are both located on the same side of the main body along a second direction, the shell includes two end covers, the two end covers are respectively arranged on two ends of the shell main body, the electrode terminals include a positive electrode terminal and a negative electrode terminal, the positive electrode terminal and the negative electrode terminal are respectively arranged on the two end covers, the number of the adapter structures is two, the cathode tab is electrically connected with the positive electrode terminal through one of the adapter structures, and the anode tab is electrically connected with the negative electrode terminal through another of the adapter structures, the main body has a third middle surface, the third middle surface is perpendicular to the first direction, the two adapter structures are symmetrically arranged relative to the third middle surface, the anode tab is arranged close to the end cover where the negative electrode terminal is arranged, and the cathode tab is arranged close to the end cover where the positive electrode terminal is arranged.

16. A battery device, comprising the battery cell according to any one of claims 1-15.

17. An energy storage device, comprising the battery cell according to any one of claims 1-15.

18. An energy storage system, comprising the energy storage device according to claim 17.

19. A charging network, comprising the energy storage device according to claim 17.

20. A charging network, comprising the energy storage system according to claim 18. ​ ​ ​ ​ ​

Images