Battery monomer, battery and electric equipment

Abstract

The utility model belongs to the technical field of battery devices, and particularly relates to a battery monomer, a battery and electric equipment. The battery cell comprises: a housing provided with an accommodating space and a first assembly opening; the naked battery cell is mounted in the accommodating space, and the naked battery cell is provided with a first tab; the first end cover covers the first assembly opening; the first adapter piece is installed in the containing space and comprises a first connecting part and a second connecting part which are connected, the first connecting part and the second connecting part have a height difference in the height direction of the shell, the first connecting part is welded to the first end cover, and the second connecting part is provided with at least one first welding printing part; the first welding printing part protrudes towards the direction of the first tab and is welded with the first tab. By applying the technical scheme, the problem that a naked battery cell is easy to burn and damage when a top cover and an adapter plate are welded in the prior art is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of battery devices, and in particular, relates to a battery cell, a battery and an electrical device. Background Art

[0002] With the gradual popularization of new energy technologies, lithium battery technology has developed accordingly. Lithium batteries are favored by the new energy industry because of their excellent characteristics such as large power storage capacity, stable power supply capacity, and long service life.

[0003] At present, lithium battery cells mainly include square battery cells and cylindrical battery cells. Among them, cylindrical battery cells have the advantages of high capacity, long cycle life, and wide operating temperature range. Therefore, batteries composed of cylindrical battery cells are widely used in new energy products.

[0004] The cylindrical battery cell includes a bare cell, a cylindrical shell and a top cover. The cylindrical shell is a structure with one end open and the other end closed. The top cover is installed to the open end of the cylindrical shell body and forms a sealing arrangement, thereby forming a containing cavity, and the bare cell is installed in the containing cavity. In the cylindrical battery cell, the top cover and the bare cell are generally connected through an adapter to achieve electrical connection between the top cover and the positive pole tab of the bare cell. When the adapter is used for the transfer assembly, the adapter and the positive pole tab of the bare cell and the adapter and the top cover are connected and fixed by welding.

[0005] In the related art, since the adapter is a thin sheet, the top cover and the bare cell are close to each other, almost close to each other. Therefore, when welding between the adapter and the positive pole ear of the bare cell and between the top cover and the adapter, a large amount of heat generated by welding is concentrated on the adapter, and the heat is easily transferred to the bare cell, causing burn damage to the bare cell, and even causing the bare cell to be damaged and scrapped, affecting the product yield of the cylindrical battery. Utility Model Content

[0006] The purpose of the present application is to provide a battery cell, a battery and an electrical device, aiming to solve the problem in the related art that welding a top cover and an adapter plate easily causes burn damage to the bare battery cell.

[0007] To achieve the above-mentioned purpose, according to the first aspect of the present application, the technical solution adopted in the present application is: a battery cell, comprising:

[0008] The housing is provided with a receiving space, and the housing has a first assembly opening;

[0009] A bare battery cell is installed in the accommodation space, and the bare battery cell has a first pole ear;

[0010] A first end cover, covering the first assembly opening;

[0011] The first adapter piece is installed in the accommodation space. The first adapter piece includes a connected first connection part and a second connection part. The first connection part and the second connection part have a height difference in the height direction of the housing. The first connection part is welded to the first end cap. The second connection part is provided with at least one first welding mark part, and the first welding mark part protrudes towards the direction of the first pole ear, and the first welding mark part is welded to the first pole ear.

[0012] When manufacturing a battery cell by using the first adapter piece provided in this application, since the first adapter piece is provided with a first connection part for welding to the first end cap and a second connection part for welding to the first pole ear of the bare battery cell, and the first connection part and the second connection part have a height difference in the height direction of the housing, therefore, a distance is spaced between the first end cap and the bare battery cell in the axial direction of the battery cell, that is, an air gap is formed between the first end cap and the bare battery cell in the axial direction of the battery cell. And, the second connection part is provided with a first welding mark part protruding towards the direction of the first pole ear, so that the air gap formed between the first end cap and the bare battery cell is further increased. Therefore, when welding between the second connection part of the first adapter piece and the first pole ear of the bare battery cell and between the first end cap and the first connection part of the first adapter piece, a large amount of heat is generated during welding. Most of the heat is transferred from the first end cap to the bare battery cell through the air gap, and a small part of the heat is transferred to the bare battery cell through the paths of the first end cap, the first connection part, the second connection part, the first welding mark part and the first pole ear. In this way, the heat generated by welding can be reduced from being transferred to the bare battery cell, which is beneficial to reducing the probability of the heat generated by welding causing burning damage to the bare battery cell, and then helps to improve the product yield of the battery cell.

[0013] In some embodiments of this application, the number of the first connection parts is multiple, and multiple first connection parts are all welded to the first end cap, which improves the welding strength between the first adapter piece and the first end cap and improves the connection stability. The number of the second connection parts is multiple, and multiple second connection parts are all welded to the first pole ear of the bare battery cell, which improves the welding strength between the first adapter piece and the first pole ear and improves the connection stability. Multiple first connection parts and multiple second connection parts are alternately connected in sequence. Among them, each second connection part is provided with at least one first welding mark part. And, during the process of welding the first connection part and the second connection part, each first connection part and each second connection part are welded one by one and dispersedly. In this way, the heat generated during the welding of each first connection part and each second connection part is dispersed, avoiding heat concentration, so as to help reduce the probability of the heat generated by welding causing burning damage to the bare battery cell.

[0014] In some embodiments of this application, multiple first connection parts and multiple second connection parts are alternately connected end to end in sequence.

[0015] In some embodiments of the present application, multiple first welding imprints are symmetrically arranged in pairs with respect to the center point of the first adapter plate, such that the forces between two opposite first welding imprints and the first end cap are symmetrical, ensuring the welding stability between the first end cap and the first adapter plate.

[0016] In some embodiments of the present application, the first end cap is provided with multiple first positioning structures, and the first connecting portion is provided with multiple second positioning structures. The second positioning structures are installed in one-to-one correspondence with the first positioning structures, so that the first end cap and the first adapter plate can be quickly and accurately aligned, and then the welding operation can be carried out, improving the welding efficiency.

[0017] In some embodiments of the present application, the second positioning structures are symmetrically arranged in pairs with respect to the center point of the first adapter plate, such that the first end cap and the first adapter plate can be quickly and accurately aligned, and then the welding operation can be carried out, improving the welding efficiency.

[0018] In some embodiments of the present application, the first positioning structure is set as a groove, and the second positioning structure is set as a protrusion, such that the first end cap and the first adapter plate can be quickly and accurately aligned, and then the welding operation can be carried out, improving the welding efficiency.

[0019] In some embodiments of the present application, the first connecting portion and the second connecting portion are integrally formed, simplifying the structure of the first adapter plate and improving the production efficiency.

[0020] In some embodiments of the present application, the first connecting portion is provided with a second welding imprint. The second welding imprint protrudes towards the first end cap, and the second welding imprint is welded to the first end cap. By providing the protruding second welding imprint, the distance of the air gap formed between the first end cap and the bare battery cell is further increased, so that the heat generated by welding can be reduced from being transferred to the bare battery cell, which is beneficial to reducing the probability of the heat generated by welding causing burning damage to the bare battery cell.

[0021] In some embodiments of the present application, the first adapter plate is provided with a first liquid injection hole. The first connecting portion and the second connecting portion surround the first liquid injection hole. The first end cap is provided with a second liquid injection hole, and the second liquid injection hole is disposed opposite to the first liquid injection hole of the first adapter plate.

[0022] In some embodiments of the present application, the first end cap is further provided with an explosion-proof notch. The explosion-proof notch is in an arc shape and surrounds the second liquid injection hole. The explosion-proof notch can achieve pressure relief inside the battery cell and prevent the occurrence of battery cell explosion.

[0023] In some embodiments of the present application, the battery cell further includes a first insulating member and a second insulating member. The first insulating member and the second insulating member are disposed opposite to each other and wrap the circumferential edge of the first end cap. The first end cap is insulated from the housing through the first insulating member and the second insulating member, so that the first insulating member and the second insulating member can quickly wrap the circumferential edge of the first end cap, improving the assembly efficiency.

[0024] In some embodiments of the present application, the housing is a cylindrical housing. The housing is provided with a rolling groove structure recessed towards the accommodating space. The rolling groove structure is close to the first assembly opening. The rolling groove structure abuts against the shoulder of the bare battery cell. The second insulating member abuts against the rolling groove structure. The housing at the first assembly opening is provided with a circumferential flange. The first insulating member is clamped between the circumferential flange and the first end cap. In this way, the first end cap cannot be separated from the housing, ensuring that the first end cap is firmly and stably installed at the first assembly opening.

[0025] According to a second aspect of the present application, there is provided a battery. Wherein, the battery includes the battery cell as described above.

[0026] According to a second aspect of the present application, there is provided an electrical device. Wherein, the electrical device includes the battery as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 is an exploded schematic view of the battery cell according to the embodiment of the present application;

[0029] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0030] Figure 3 is Figure 1 a partial cross-sectional schematic view of the battery cell shown;

[0031] Figure 4 is Figure 1 a schematic structural view of a first adapter piece adopted by the battery cell shown;

[0032] Figure 5 is Figure 1 a schematic structural view of another first adapter piece adopted by the battery cell shown;

[0033] Figure 6 is Figure 1Schematic structural diagram of the first end cap adopted by the shown battery cell;

[0034] Figure 7 Exploded view of the battery according to the embodiment of the present application;

[0035] Figure 8 Schematic structural diagram of the electrical equipment according to the embodiment of the present application.

[0036] Among them, each reference numeral in the figure:

[0037] 10. First adapter piece;

[0038] 11. First connection part; 111. Second welding mark part; 112. Second positioning structure; 12. Second connection part; 121. First welding mark part; 13. First liquid injection hole;

[0039] 20. Battery cell;

[0040] 21. Shell; 211. First assembly opening; 212. Accommodating space; 213. Groove structure; 214. Circumferential flange; 22. Bare battery core; 221. First welding part; 222. Shoulder; 23. First end cap; 231. Second liquid injection hole; 232. Explosion-proof notch; 233. Circumferential installation area; 234. Second welding part; 24. Insulation assembly; 241. First insulation part; 242. Second insulation part; 25. Screwing cap; 26. Plug block;

[0041] 30. Battery;

[0042] 31. Box shell; 311. Box main body; 312. Box cover; 313. Assembly space;

[0043] 40. Electrical equipment;

[0044] 41. Driving motor; 42. Frame; 43. Wheel. Detailed implementation manners

[0045] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote 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 should not be construed as a limitation to the present application.

[0046] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0047] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] At present, in order to meet the requirements of high endurance, electric vehicles generally use multiple battery cells to form a battery, which stores electricity and supplies power, thereby storing a large amount of electricity to ensure high endurance. Among them, cylindrical battery cells have the advantages of high capacity, long cycle life, and wide operating temperature range. Therefore, batteries composed of cylindrical battery cells are widely used in new energy products.

[0050] In cylindrical battery cells, the top cover and the bare cell are generally connected via an adapter to achieve electrical connection between the top cover and the positive electrode tab of the bare cell. When the adapter is used for assembly, the adapter and the positive electrode tab of the bare cell and the adapter and the top cover are connected and fixed by welding.

[0051] In the related art, since the adapter is a thin sheet, the top cover and the bare cell are close to each other, almost close to each other. Therefore, when welding between the adapter and the positive pole ear of the bare cell and between the top cover and the adapter, a large amount of heat generated by welding is concentrated on the adapter, and the heat is easily transferred to the bare cell, causing burn damage to the bare cell, and even causing the bare cell to be damaged and scrapped, affecting the product yield of the cylindrical battery.

[0052] Based on the above considerations, an embodiment of the present application provides a battery cell (i.e., a cylindrical battery cell), and the battery cell transfers the first tab of the bare battery core to the first end cap through a first adapter tab. Since the first adapter tab is provided with a first connection portion welded to the first end cap and a second connection portion welded to the first tab of the bare battery core, and the first connection portion and the second connection portion have a height difference in the height direction of the housing, an air gap is formed between the first end cap and the bare battery core in the axial direction of the cylindrical battery cell. Moreover, the second connection portion is provided with a first welding mark portion protruding in the direction of the first tab, so that the air gap formed between the first end cap and the bare battery core is further increased. When welding between the first adapter tab and the first tab of the bare battery core and between the first end cap and the first adapter tab, a large amount of heat is generated during welding. Most of the heat is transferred from the first end cap to the bare battery core through the air gap, and a small part of the heat is transferred to the bare battery core through the path of the first end cap, the first connection portion, the second connection portion, the first welding mark portion and the first tab. Since the heat transfer efficiency of the air gap is relatively low, the heat generated by welding can be reduced from being transferred to the bare battery core, which is beneficial to reducing the probability of the heat generated by welding causing burning damage to the bare battery core, and then helps to improve the product yield of the cylindrical battery cell. Further, the cylindrical battery cell obtained by production is used for manufacturing a battery, and the battery is applied to a corresponding electrical device, and the battery provides a stable power supply capacity for the electrical load of the electrical device.

[0053] An embodiment of the present application provides a battery cell 20. As Figures 1 to 3 shown, the battery cell 20 includes a housing 21, a bare battery core 22, a first end cap 23, and a first adapter tab 10. The housing 21 is provided with an accommodation space 212, and the housing 21 has a first assembly opening 211, and the first assembly opening 211 communicates with the accommodation space 212. The bare battery core 22 is installed in the accommodation space 212, and the bare battery core 22 has a first tab. The first end cap 23 covers the first assembly opening 211 so that the accommodation space 212 forms a closed space, and the first end cap 23 and the housing 21 are insulated from each other. The first adapter tab 10 is installed in the accommodation space 212. The first adapter tab 10 includes a connected first connection portion 11 and a second connection portion 12. The first connection portion 11 and the second connection portion 12 have a height difference in the height direction of the housing 21, so that a distance is formed between the first connection portion 11 and the second connection portion 12 in the axial direction of the battery cell 20. The first connection portion 11 of the first adapter tab 10 is welded to the first end cap 23, and the second connection portion 12 is provided with at least one first welding mark portion 121. The first welding mark portion 121 protrudes in the direction of the first tab, and the first welding mark portion 121 is welded to the first welding portion 221 of the first tab.

[0054] Among them, the first tab can refer to the positive tab of the bare battery cell 22 or the negative tab of the bare battery cell 22. Taking the first tab as the positive tab of the bare battery cell 22 as an example, the first tab of the bare battery cell 22 is electrically connected to the second connecting portion 12 of the first adapter piece 10, and the first connecting portion 11 of the first adapter piece 10 is electrically connected to the first end cap 23. When the battery cell 20 discharges and charges, the current flows through the first tab, the second connecting portion 12, the first connecting portion 11, and the first end cap 23 in sequence.

[0055] When manufacturing the battery cell 20 by using the first adapter piece 10 provided in the present application, since the first adapter piece 10 is provided with a first connecting portion 11 for welding with the first end cap 23 and a second connecting portion 12 for welding with the first tab of the bare battery cell 22, and there is a height difference between the first connecting portion 11 and the second connecting portion 12 in the height direction of the housing 21. Therefore, a distance is spaced between the first end cap 23 and the bare battery cell 22 in the axial direction of the battery cell 20, that is, an air gap is formed between the first end cap 23 and the bare battery cell 22 in the axial direction of the battery cell 20. Moreover, the second connecting portion 12 is provided with a first welding imprint portion 121 protruding towards the direction of the first tab, so that the air gap formed between the first end cap 23 and the bare battery cell 22 is further increased. Therefore, when welding between the second connecting portion 12 of the first adapter piece 10 and the first tab of the bare battery cell 22 and between the first end cap 23 and the first connecting portion 11 of the first adapter piece 10, a large amount of heat is generated during welding. Most of the heat is transferred from the first end cap 23 to the bare battery cell 22 through the air gap, and a small part of the heat is transferred to the bare battery cell 22 through the path of the first end cap 23, the first connecting portion 11, the second connecting portion 12, the first welding imprint portion 121, and the first tab. Since the heat transfer efficiency of the air gap is relatively low, the heat generated by welding can be reduced from being transferred to the bare battery cell 22, which is beneficial to reducing the probability of the heat generated by welding causing burning damage to the bare battery cell 22, and then helps to improve the product yield of the battery cell 20.

[0056] Among them, the "sealed space" in "the first end cap 23 covers the first assembly opening 211 so that the accommodation space 212 is formed into a sealed space" means that the dust-proof and waterproof performance can be achieved, and the accommodation space 212 is airtight and air-impermeable.

[0057] Specifically, the height difference between the first connecting portion 11 and the second connecting portion 12 in the height direction of the housing 21 is between 0.1 mm and 10 mm.

[0058] In some embodiments of the present application, such as Figure 4As shown, the second connecting portion 12 is provided with a first welding mark portion 121, and the first welding mark portion 121 is used for welding with the first tab. Among them, the shape of the first welding mark portion 121 includes one or several combinations of arc shape, circular shape, oval shape, square shape, and linear shape. In this way, by specifically providing the first welding mark portion 121 on the second connecting portion 12 and welding the first welding mark portion 121 with the first tab of the bare battery cell 22, not only can the welding position between the second connecting portion 12 and the first tab be clearly and accurately marked, so as to quickly align the first tab and the second connecting portion 12 and then perform the welding operation to improve the welding efficiency, but also the welding strength between the first adapter piece 10 and the first tab of the bare battery cell 22 can meet the requirements of the connection strength, and can meet the over-current demand, ensuring normal conduction between the first tab and the second connecting portion 12.

[0059] In the embodiment of the present application, the shape of the first welding mark portion 121 is preferably set as an arc shape, as Figure 4 shown. Further, the protruding first welding mark portion 121 can correspondingly shorten the length of the first tab, and then can save the usage amount of the battery cell material, thereby saving the material cost.

[0060] In some embodiments of the present application, as Figure 4 and Figure 5 shown, the number of the first connecting portions 11 is multiple, and the number of the second connecting portions 12 is multiple. The multiple first connecting portions 11 and the multiple second connecting portions 12 are alternately connected in sequence along the circumferential direction. In this embodiment, the first adapter piece 10 as a whole can be a fan-shaped structural member, or the first adapter piece 10 can also be an annular structural member. The multiple first connecting portions 11 are all welded to the first end cap 23, improving the welding strength between the first adapter piece 10 and the first end cap 23 and improving the connection stability. And the multiple second connecting portions 12 are all welded to the first tab of the bare battery cell 22, improving the welding strength between the first adapter piece 10 and the first tab and improving the connection stability. In this way, a more stable connection can be always maintained between the first end cap 23 and the first tab, maintaining stable conduction performance. And during the welding process of the first connecting portion 11 and the second connecting portion 12, each first connecting portion 11 and each second connecting portion 12 are welded one by one and dispersedly, so that the heat generated during the welding of each first connecting portion 11 and each second connecting portion 12 is dispersed, avoiding heat concentration, and thus helping to reduce the probability of the heat generated by welding causing burning damage to the bare battery cell 22. Among them, each second connecting portion 12 is provided with at least one first welding mark portion 121.

[0061] Further, in some embodiments of the present application, as Figure 4 and Figure 5As shown, a plurality of first connecting portions 11 and a plurality of second connecting portions 12 are connected end to end in sequence alternately along the circumferential direction. That is, in this embodiment, the first adapter piece 10 is an annular structural member.

[0062] In some embodiments of the present application, as Figure 4 and Figure 5 shown, a plurality of first welding imprint portions 121 are arranged symmetrically in pairs with respect to the center point of the first adapter piece 10. In this way, when the plurality of first welding imprint portions 121 are welded to the first tab, the acting forces between two opposite first welding imprint portions 121 and the first tab are symmetrical, avoiding the situation where the welding acting force on one side between the first adapter piece 10 and the first tab is smaller while the welding acting force on the opposite side is larger, thereby ensuring the welding stability between the first adapter piece 10 and the first tab, making it not easy to have the risk of tearing between the first adapter piece 10 and the first tab, and ensuring stable conduction between the first adapter piece 10 and the first tab.

[0063] In some embodiments of the present application, the first end cap 23 is provided with a plurality of first positioning structures. Correspondingly, as Figure 2 , Figure 4 and Figure 5 shown, the first connecting portion 11 is provided with a plurality of second positioning structures 112, and the second positioning structures 112 are installed in one-to-one correspondence with the first positioning structures. When the first end cap 23 is placed on the first adapter piece 10 so that the first end cap 23 and the first adapter piece 10 are aligned with each other, the first positioning structure and the second positioning structure 112 are fitted with each other, so that the first end cap 23 and the first adapter piece 10 can be quickly and accurately aligned, and then the welding operation is performed, improving the welding efficiency.

[0064] Specifically, the second positioning structures 112 are arranged symmetrically in pairs with respect to the center point of the first adapter piece 10. And, preferably, the second positioning structures 112 are set to be two that are symmetric about the center point of the first adapter piece 10. Correspondingly, the first positioning structures are correspondingly set to be two. By installing the two second positioning structures 112 in one-to-one correspondence with the two first positioning structures, the first end cap 23 and the first adapter piece 10 can be quickly and accurately aligned, and then the welding operation is performed, improving the welding efficiency.

[0065] In some embodiments of the present application, the first positioning structure is arranged as a groove, and the corresponding second positioning structure 112 is arranged as a protrusion. Moreover, the height between the top of the protrusion and the surface of the first connecting portion 11 is between 0.1 mm and 10 mm. When placing the first end cap 23 on the first adapter piece 10, by rotating and adjusting the first end cap 23, the protrusion is inserted into the groove, so as to quickly complete the positioning and assembly between the first positioning structure and the second positioning structure 112, forming a positioning restriction between the first end cap 23 and the first adapter piece 10, such that the first end cap 23 will not rotate and shift relative to the first adapter piece 10 during the welding process, ensuring the efficient progress of the welding work, and thus improving the welding work efficiency.

[0066] In some embodiments of the present application, the first connecting portion 11 and the second connecting portion 12 are integrally formed. For example, the first adapter piece 10 is manufactured by means of blanking processing. Since multiple first connecting portions 11 and multiple second connecting portions 12 in the first adapter piece 10 are alternately connected end to end in sequence, the structure of the first adapter piece 10 is simplified. Therefore, the simplified structure can reduce the difficulty of blanking processing, thereby improving the production efficiency.

[0067] In some embodiments of the present application, as Figure 5 shown, the first connecting portion 11 is provided with a second welding mark portion 111, and the second welding mark portion 111 protrudes towards the direction of the first end cap 23, and the second welding mark portion 111 is welded to the first end cap 23. Among them, the second welding mark portion 111 includes one or several combinations of an arc shape, a circular shape, an oval shape, a square shape, a line segment shape, etc. In this way, by specially providing the second welding mark portion 111 on the first connecting portion 11 and welding the second welding mark portion 111 to the first end cap 23, not only can the welding position between the first connecting portion 11 and the first end cap 23 be clearly and accurately marked by the second welding mark portion 111, and then the welding operation can be carried out to improve the welding efficiency, but also the welding strength between the first adapter piece 10 and the first end cap 23 can meet the requirements of the connection strength, and can meet the overcurrent demand, ensuring normal conduction between the first end cap 23 and the first connecting portion 11. Moreover, by providing the protruding second welding mark portion 111, the distance of the air gap formed between the first end cap 23 and the bare battery cell 22 is further increased, so as to be able to reduce the heat transfer generated by welding to the bare battery cell 22, which is beneficial to reducing the probability of the heat generated by welding causing burning damage to the bare battery cell 22.

[0068] In the embodiments of the present application, the shape of the second welding mark portion 111 is preferably set as an arc shape, as Figure 5 shown. Moreover, the height by which the second welding mark portion 111 protrudes relative to the first connecting portion 11 is less than the height by which the second positioning structure 112 protrudes relative to the first connecting portion 11.

[0069] In some embodiments of the present application, as Figure 5 shown, a plurality of second welding imprint portions 111 are symmetrically arranged in pairs with respect to the center point of the first adapter piece 10. In this way, when the plurality of second welding imprint portions 111 are welded to the first end cap 23, the acting forces between two opposite second welding imprint portions 111 and the first end cap 23 are symmetrical, avoiding the situation where the welding acting force on one side between the first adapter piece 10 and the first end cap 23 is smaller while the welding acting force on the opposite side is larger, thereby ensuring the welding stability between the first end cap 23 and the first adapter piece 10, making it not easy for the first end cap 23 and the first adapter piece 10 to have the risk of being torn, and ensuring stable conduction between the first end cap 23 and the first adapter piece 10.

[0070] In some other embodiments of the present application, the second welding imprint portion 111 can also be a region range directly outlined on the surface of the first connecting portion 11. In this way, the method of marking the second welding imprint portion 111 is very convenient and fast.

[0071] In some embodiments of the present application, as Figure 4 and Figure 5 shown, the first adapter piece 10 is provided with a first liquid injection hole 13, and both the first connecting portion 11 and the second connecting portion 12 circumferentially surround the first liquid injection hole 13. After the welding operation on the first adapter piece 10 is completed, electrolyte is injected into the battery cell 20 through the first liquid injection hole 13, so that the electrolyte wets the bare electric core 22. Specifically, the first liquid injection hole 13 is formed by surrounding of the first connecting portion 11 and / or the second connecting portion 12. In the present application, the first liquid injection hole 13 is opened at the middle position of the first adapter piece 10, so that the setting of the first liquid injection hole 13 does not affect the mechanical strength of the first adapter piece 10 itself and is convenient for liquid injection operation.

[0072] In some embodiments of the present application, as Figure 2 and Figure 6 shown, the first end cap 23 is provided with a second liquid injection hole 231, and the second liquid injection hole 231 is disposed opposite to the first liquid injection hole 13 of the first adapter piece 10. That is, the second liquid injection hole 231 is opened at the middle position of the first end cap 23, so that the setting of the second liquid injection hole 231 does not affect the mechanical strength of the first end cap 23 itself and is convenient for liquid injection operation. As Figure 3 shown, after the liquid injection operation is completed, a plug 26 is inserted into the second liquid injection hole 231 to block the second liquid injection hole 231, and then the screw cap 25 is screwed and installed on the first end cap 23 and the screw cap 25 completely covers the plug 26, thereby preventing the plug 26 from coming out of the second liquid injection hole 231 and ensuring that the electrolyte in the battery cell 20 does not leak.

[0073] In some embodiments of the present application, as Figures 1 to 3As shown, the battery cell 20 further includes an insulating assembly 24, and the insulating assembly 24 is disposed between the first end cap 23 and the housing 21. By insulating the space between the first end cap 23 and the housing 21 through the insulating assembly 24, it is ensured that no short circuit occurs between the first end cap 23 and the housing 21, and the battery cell 20 can be normally conducted. Among them, as Figure 2 and Figure 3 shown, the insulating assembly 24 includes a first insulating member 241 and a second insulating member 242. The first insulating member 241 and the second insulating member 242 are oppositely disposed to cover the circumferential edge of the first end cap 23. Moreover, the circumferential side walls of the first insulating member 241 and the second insulating member 242 abut against the inner wall of the housing 21, so as to achieve insulation between the first end cap 23 and the housing 21. By using the assembly method of laminating the first insulating member 241 and the second insulating member 242 on the upper and lower layers to cover the circumferential edge of the first end cap 23, the first insulating member 241 and the second insulating member 242 can quickly complete the covering of the circumferential edge of the first end cap 23, improving the assembly efficiency.

[0074] In some embodiments of the present application, the housing 21 is a cylindrical housing 21. As Figures 1 to 3 shown, the housing 21 is provided with a rolling groove structure 213 recessed towards the accommodating space 212, and the rolling groove structure 213 is close to the first assembly opening 211. After the bare battery cell 22 is placed into the accommodating space 212, the rolling groove structure 213 is rolled out circumferentially on the outer side of the housing 21, so that the rolling groove structure 213 abuts against the shoulder 222 of the bare battery cell 22. Moreover, the bare battery cell 22 is coated with a blue film for insulation protection, so that insulation is provided between the rolling groove structure 213 and the shoulder 222 of the bare battery cell 22. Further, one of the first insulating member 241 and the second insulating member 242 abuts against the rolling groove structure 213 (as Figure 3 shown in the battery cell 20, it is the second insulating member 242 that abuts against the rolling groove structure 213). That is to say, the rolling groove structure 213 supports the circumferential edge of the first end cap 23, so that the first end cap 23 will not collapse into the accommodating space 212. After the first end cap 23 is installed, the housing 21 at the first assembly opening 211 is provided with a circumferential flange 214, and the circumferential flange 214 buckles the other one of the first insulating member 241 and the second insulating member 242 (as Figure 3 shown in the battery cell 20, it is the first insulating member 241 that is buckled by the circumferential flange 214). In this way, the first end cap 23 cannot be separated from the housing 21, ensuring that the first end cap 23 is firmly and stably installed at the first assembly opening 211.

[0075] When a thermal runaway occurs during the charge and discharge process of the battery cell 20, high-temperature flue gas is generated inside the battery cell 20. If the high-temperature and high-pressure flue gas cannot be discharged in time for pressure relief, the internal pressure of the battery cell 20 will continue to rise (i.e., in a high-pressure state), and ultimately may cause the battery cell 20 to explode, which is very dangerous. Therefore, in some embodiments of the present application, as Figure 2 and Figure 6 shown, the first end cap 23 is further provided with an explosion-proof notch 232. In this way, when the high-temperature and high-pressure flue gas inside the battery cell 20 reaches the preset pressure threshold of the explosion-proof notch 232, the explosion-proof notch 232 ruptures, thereby realizing pressure relief inside the battery cell 20 and preventing the battery cell 20 from exploding. Among them, the explosion-proof notch 232 is in an arc shape, and the explosion-proof notch 232 surrounds the second liquid injection hole 231. Further, as Figure 6 shown, the first end cap 23 has a second welding part 234, and the second welding part 234 is welded to the second welding mark part 111 of the first connection part 11 of the first adapter piece 10. The second welding part 234 surrounds the explosion-proof notch 232, that is, the explosion-proof notch 232 is arranged between the second liquid injection hole 231 and the second welding part 234. In this way, the surface position of the first end cap 23 can be fully utilized, and the structural positions of the second liquid injection hole 231, the explosion-proof notch 232 and the second welding part 234 can be reasonably designed and distributed on the limited surface position of the first end cap 23.

[0076] In some other embodiments of the present application, the explosion-proof notch 232 can also be arranged around the second welding part 234. Since the second welding part 234 is welded to the first connection part 11, therefore, for the way that the explosion-proof notch 232 is arranged between the second liquid injection hole 231 and the second welding part 234, when the explosion-proof notch 232 is arranged in the way of surrounding the second welding part 234, the preset pressure threshold of the explosion-proof notch 232 is higher. Therefore, according to the actual situation of the battery cell 20, the way of arranging the explosion-proof notch 232 around the second welding part 234 can be selected, or the way of arranging the explosion-proof notch 232 between the second liquid injection hole 231 and the second welding part 234 can be selected.

[0077] In the embodiments of the present application, the first end cap 23 preferably adopts the way that the explosion-proof notch 232 is arranged between the second liquid injection hole 231 and the second welding part 234.

[0078] In some embodiments of the present application, as Figure 2 and Figure 6As shown, a circumferential installation area 233 is further provided in the circumferential edge area of the first end cover 23. The first insulating member 241 and the second insulating member 242 are installed in the circumferential installation area 233 to facilitate the installation of the first insulating member 241 and the second insulating member 242 on the circumferential edge area of the first end cover 23, thereby covering the circumferential edge area of the first end cover 23 and improving the assembly efficiency. Moreover, the second welding portion 234 is located between the explosion-proof notch 232 and the circumferential installation area 233.

[0079] According to a second aspect of the present application, a battery 30 is provided, as Figure 7 shown. Among them, the battery 30 includes the battery cell 20 as described above, and the battery cells 20 are arranged in an array.

[0080] As Figure 7 shown, the battery 30 further includes a box housing 31, and the box housing 31 forms an assembly space 313. Among them, the box housing 31 includes a box main body 311 and a box cover 312, and the box cover 312 covers the box main body 311 to form a closed assembly space 313. The battery cells 20 are installed in the assembly space 313 in an array.

[0081] According to a third aspect of the present application, an electrical equipment 40 is provided, as Figure 8 shown. Among them, the electrical equipment 40 includes the battery 30 as described above, uses the battery 30 for charging and energy storage, and uses the battery 30 for discharging to provide electrical energy for the electrical load of the electrical equipment 40.

[0082] The electrical equipment 40 includes, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include, but is not limited to, a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft can include, but is not limited to, an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0083] In an embodiment of the present application, the electrical equipment 40 is an electric vehicle, as Figure 8 shown, and the battery 30 is installed on the vehicle frame 42 of the electric vehicle. Using the battery 30 provided by the design of the embodiment of the present application to supply power to the drive motor 41 (i.e., the electrical load of the electrical equipment 40) of the electric vehicle, the drive motor 41 drives the wheels 43 to rotate, so that the electric vehicle can run normally.

[0084] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing is provided with a receiving space, wherein the housing has a first assembly opening; A bare battery cell is installed in the accommodation space, and the bare battery cell has a first pole ear; A first end cover, covering the first assembly opening; A first adapter plate is installed in the accommodating space, the first adapter plate includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion and the second connecting portion have a height difference along the height direction of the shell, the first connecting portion is welded to the first end cover, the second connecting portion is provided with at least one first weld stamp portion, the first weld stamp portion protrudes toward the direction of the first pole ear, and the first weld stamp portion is welded to the first pole ear.

2. The battery cell according to claim 1, characterized in that: There are multiple first connection parts, and there are multiple second connection parts. The multiple first connection parts and the multiple second connection parts are connected alternately in sequence, and each of the second connection parts is provided with at least one first welding part.

3. The battery cell according to claim 2, characterized in that: The plurality of first connection parts and the plurality of second connection parts are connected end to end in sequence and alternately.

4. The battery cell according to claim 2 or 3, characterized in that: The plurality of first welding portions are symmetrically arranged in pairs about a center point of the first adapter sheet.

5. The battery cell according to any one of claims 1 to 3, characterized in that: The first end cover is provided with a first positioning structure, the first connecting portion is provided with a second positioning structure, and the second positioning structure is installed in a one-to-one correspondence with the first positioning structure.

6. The battery cell according to claim 5, characterized in that: The second positioning structures are symmetrically arranged in pairs with respect to the center point of the first adapter plate.

7. The battery cell according to claim 5, characterized in that: The first positioning structure is configured as a groove, and the second positioning structure is configured as a protrusion.

8. The battery cell according to any one of claims 1 to 3, characterized in that: The first connection portion and the second connection portion are integrally formed.

9. The battery cell according to any one of claims 1 to 3, characterized in that: The first connection portion is provided with a second weld portion, the second weld portion protrudes toward the first end cover, and the second weld portion is welded to the first end cover.

10. The battery cell according to claim 9, characterized in that: The first adapter plate is provided with a first liquid injection hole, the first connecting portion and the second connecting portion surround the first liquid injection hole, the first end cover is provided with a second liquid injection hole, and the second liquid injection hole is arranged opposite to the first liquid injection hole.

11. The battery cell according to claim 10, characterized in that: The first end cover is also provided with an explosion-proof notch, which is in an arc shape and surrounds the second liquid injection hole.

12. The battery cell according to claim 11, characterized in that: The battery cell further includes a first insulating member and a second insulating member, wherein the first insulating member and the second insulating member jointly cover the circumferential edge of the first end cover to insulate the first end cover from the shell.

13. The battery cell according to claim 12, characterized in that: The shell is a cylindrical shell, and the shell is provided with a rolling groove structure recessed toward the accommodating space, the rolling groove structure is close to the first assembly opening, the rolling groove structure abuts against the shoulder of the bare battery cell, the second insulating member abuts against the rolling groove structure, the shell at the first assembly opening is provided with a circumferential flange, and the first insulating member is clamped between the circumferential flange and the first end cover.

14. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 13.

15. An electrical equipment, characterized in that: Comprising the battery of claim 14.

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