Battery monomer and power utilization device

Abstract

The utility model relates to a battery monomer and a power utilization device. The shell is provided with an accommodating cavity and a mounting hole communicated with the accommodating cavity; the electrode assembly comprises a battery cell main body and two tabs, the battery cell main body is accommodated in the accommodating cavity, and the two tabs are arranged on one side, facing the mounting hole, of the battery cell main body; the pole assembly comprises a pole and a pole table, the pole is arranged at the mounting hole, and the pole table is arranged on one side, facing the mounting hole, of the battery cell main body and is provided with a through hole; each tab is provided with a first section and a second section which are connected with each other, the first sections of the two tabs penetrate through the through hole, the second sections of the two tabs are located between the pole table and the pole, and the second sections of the two tabs are located on the two opposite sides of the through hole respectively and connected with the pole and the pole table.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell and an electrical device. Background Technology

[0002] Lithium-ion batteries have high energy density, long cycle life, good rate performance and safety, and are environmentally friendly, making them an important energy product for modern electronic products and electric vehicles.

[0003] A battery typically consists of multiple individual cells. Within each cell, the positive or negative tab is electrically connected to the positive and negative terminals via adapters, respectively, making the positive and negative terminals the positive and negative electrodes of the cell. To simplify the structure and improve space utilization, the positive tab is directly soldered to the positive terminal, and the negative tab is directly soldered to the negative terminal, thus eliminating the need for two adapters.

[0004] However, during the assembly process, after the tab is shaped, it contacts and fits against the bottom surface of the pole, and then the tab is welded to the bottom surface of the pole. As a result, due to the thickness of the pole itself plus the thickness of the tab, the pole and the tab are not firmly welded together during the welding process. Utility Model Content

[0005] Therefore, it is necessary to provide a battery cell and power supply device that can ensure better welding quality between the terminal post and the electrode tab, thereby improving the yield rate, in order to address the above problems.

[0006] On one hand, this application provides a single battery cell, comprising:

[0007] The outer casing has a receiving cavity and a mounting hole communicating with the receiving cavity;

[0008] An electrode assembly includes a battery cell body and two tabs, wherein the battery cell body is housed within the housing cavity, and the two tabs are disposed on the side of the battery cell body facing the mounting hole;

[0009] The electrode assembly includes an electrode post and an electrode post platform. The electrode post is disposed at the mounting hole, and the electrode post platform is disposed on the side of the cell body facing the mounting hole and has a through hole. Each electrode tab has a first segment and a second segment connected to each other. The first segments of both electrodes pass through the through hole, and the second segments of both electrodes are located between the electrode post platform and the electrode post. The second segments of both electrodes are located on opposite sides of the through hole and are connected to the electrode post and the electrode post platform.

[0010] In some embodiments, the side of the electrode post facing the cell body has a blind hole, and at least a portion of the electrode post platform is accommodated within the blind hole.

[0011] In some embodiments, the pole post is fitted tightly into the blind hole.

[0012] In some embodiments, the electrode platform includes a middle portion and an edge portion, with the through hole formed in the middle portion; the portion of the edge portion near the cell body is connected to the middle portion, and the portion of the edge portion away from the cell body abuts against the wall of the blind hole.

[0013] In some embodiments, the pole post includes a bottom wall and an annular side wall connected to one side of the bottom wall, the annular side wall and the bottom wall enclosing the blind hole; the pole post platform is tightly fitted with the annular side wall, the second section of each of the two pole ears is located between the bottom wall and the pole post platform, and the second section of each of the two pole ears is connected to the bottom wall and the pole post platform.

[0014] In some embodiments, each of the tabs includes a plurality of tab pieces stacked together, and the number of tab pieces included in each of the two tabs is equal.

[0015] In some embodiments, the cell body includes two bodies arranged side by side within the receiving cavity, and each body has a tab on the side facing the electrode platform.

[0016] In some embodiments, the battery cell further includes a support block located between the cell body and the terminal block, with the support block abutting against the cell body and the terminal block abutting against the support block.

[0017] In some embodiments, the tab further includes a third section connecting the first section and the battery cell body, the support block is provided with a shaping channel, and the third section of the tab passes through the shaping channel.

[0018] In some embodiments, the housing includes a casing, the outer peripheral side of the support block extends an extension that extends beyond the cell body in the extending direction, and there is a gap between the extension and the casing.

[0019] On the other hand, this application provides an electrical device including a battery cell as described in any of the above embodiments.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] During assembly of the aforementioned battery cell and electrical device, the two tabs pass through the through-holes into the terminal block and are then bent in opposite directions, so that the second sections of the two tabs adhere to the side of the terminal block facing away from the main body of the battery cell. Then, the terminal block is placed on the terminal block, so that the second sections of both tabs are clamped between the terminal block and the terminal block. Next, the terminal block, the second sections of the two tabs, and the terminal block are welded together, connecting the second sections of both tabs to the terminal block and the terminal block. By dividing the same polarity tab bundle into two tabs and bending the second sections of the two tabs in opposite directions, the tabs and terminal blocks are directly connected. Compared to a direct connection between the terminal block and the tab bundle, this reduces the welding thickness and difficulty, resulting in a more stable connection between the terminal block and the tabs and improving the product yield. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a single battery cell in one embodiment of this application;

[0023] Figure 2 for Figure 1 The cross-sectional view of the battery cell shown;

[0024] Figure 3 for Figure 2 A magnified view of a portion of battery cell A shown;

[0025] Figure 4 This is a partial enlarged view of battery cell A in another embodiment of this application;

[0026] Figure 5 This is a partial enlarged view of battery cell A in another embodiment of this application;

[0027] Figure 6 for Figure 1 A schematic diagram of the electrode assembly of the battery cell shown;

[0028] Figure 7 for Figure 1 A schematic diagram of the terminal block structure of a single battery cell is shown.

[0029] Figure 8 This is a schematic diagram of the electrode platform of a battery cell in another embodiment of this application;

[0030] Figure 9 for Figure 1 The diagram shows the structural diagram of the terminal posts of a single battery cell;

[0031] Figure 10 for Figure 1 The diagram shows the structure of the end cap, insulating parts, and terminals of a single battery cell.

[0032] Figure 11 for Figure 1A schematic diagram of the support block for the battery cell shown.

[0033] Figure 12 for Figure 11 The diagram shows the structural schematic of the support block from another perspective. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0040] One embodiment of this application provides an electrical device that uses a battery or battery cell as its power source. Specifically, the electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical device.

[0041] A battery comprises a casing and individual battery cells, which are housed within the casing. The casing provides space for the battery cells and can have various structures and shapes, such as a cuboid. A battery may contain multiple individual cells, which can be connected in series, parallel, or a combination thereof. A combination of series and parallel connections refers to multiple battery cells being connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then housed within the casing. Alternatively, multiple battery cells can be first connected in series, parallel, or a combination thereof to form a battery module, and then these modules can be connected in series, parallel, or a combination thereof to form a single unit housed within the casing. The battery may also include other structures, such as a busbar for electrical connection between the multiple battery cells. Each battery cell can be a secondary or primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these.

[0042] The specific structure of the battery cell will be described in detail below with reference to the accompanying drawings. Figure 1 This is a schematic diagram of the structure of a single battery cell in an embodiment of this application; Figure 2 for Figure 1 A cross-sectional view of the battery cell shown; Figure 3 for Figure 2 The image shows a magnified view of a single battery cell at point A. Figure 4 This is a partial enlarged view of a single battery cell at point A in another embodiment of this application; Figure 5 This is a partial enlarged view of a single battery cell at point A in another embodiment of this application;

[0043] Figure 6 for Figure 1 A schematic diagram of the electrode assembly of the battery cell shown; Figure 7 for Figure 1 A schematic diagram of the terminal block structure of the battery cell shown. Figure 8 This is a schematic diagram of the electrode platform of a battery cell in another embodiment of this application; Figure 9 for Figure 1 The diagram shows the structural diagram of the terminal posts of a single battery cell; Figure 10 for Figure 1 The diagram shows the structure of the terminals, end caps, and insulating components in a single battery cell. Figure 11 for Figure 1 A schematic diagram of the support block for the battery cell shown. Figure 12 for Figure 1 The accompanying diagram shows the structural schematic of the support block for the battery cell from another perspective. For ease of description and understanding, the diagram only shows the structure relevant to this application.

[0044] Please see Figures 1 to 3In the embodiments of this application, the battery cell includes a housing 10 and an electrode assembly 20 (see...). Figure 6 The housing 10 includes a receiving cavity 110 and a mounting hole 121 communicating with the receiving cavity 110. The electrode assembly 20 includes a cell body 22 and two tabs 21. The cell body 22 is received within the receiving cavity 110 of the housing 10, and the two tabs 21 are disposed on the side of the cell body 22 facing the mounting hole 121. The electrode assembly 30 includes a pole 31 and a pole platform 32. The pole 31 is disposed at the mounting hole 121 of the housing 10, and the pole platform 32 is disposed on the side of the cell body 22 facing the mounting hole 121, and the pole platform 32 has a through hole 321. Each tab 21 has a first segment 211 and a second segment 213 connected to each other. The first segment 211 of both tabs 21 passes through the through hole 321 on the pole platform 32. The second segments 213 of both tabs 21 are located between the pole post 32 and the pole post 31. The second segments 213 of the two tabs 21 are located on opposite sides of the through hole 321, and both second segments 213 of the two tabs 21 are connected to the pole post 31 and the pole post 32. Specifically, the second segments 213 of both tabs 21 are welded to the pole post 31 and the pole post 32, for example, by resistance welding or laser penetration welding.

[0045] It is understood that the receiving cavity 110 is formed inside the outer casing 10, and the mounting hole 121 penetrates the first wall of the outer casing 10 and communicates with the receiving cavity 110. The two tabs 21 have the same polarity and are located on the same side of the cell body 22. Each tab 21 can be a single tab or multiple tabs of the same polarity. The cell body 22 can be a single body or multiple bodies. Each body includes a negative electrode, a separator, and a positive electrode arranged alternately in sequence. The tabs are connected to either the positive or negative electrode with the same polarity. The terminal post 31 is located at the mounting hole 121 and is insulated from the outer casing 10. The terminal post 31, the terminal post platform 32, and the two tabs 21 are located on the same side of the cell body 22. The thickness of the two tabs 21 can be the same or different, as long as the second segment 213 of one tab 21 can contact the pole platform 32 and the pole 31 respectively, and the second segment 213 of the other tab 21 can also contact the pole platform 32 and the pole 31 respectively.

[0046] Thus, during assembly, the two tabs 21 pass through the through hole 321 and then bend in opposite directions after passing through the terminal post 32, so that the second sections 213 of the two tabs 21 are located on opposite sides of the through hole 321, and the second sections 213 of the two tabs 21 are attached to the side surface of the terminal post 32 away from the cell body 22; then, the terminal post 31 and the terminal post 32 are assembled, so that the second sections 213 of the two tabs 21 are clamped between the terminal post 31 and the terminal post 32; then, the terminal post 31, the second sections 213 of the two tabs 21 and the terminal post 32 are welded, so that the second sections 213 of the two tabs 21 are connected to the terminal post 31 and the terminal post 32.

[0047] In this embodiment, by dividing the same polarity of the tab bundle into two tabs and bending the second segments 213 of the two tabs 21 in opposite directions, i.e., the second segments 213 of the two tabs 21 are located on opposite sides of the through hole 321, the tabs 21, the pole post 31 and the pole post platform 32 are welded together. Compared with the connection of the pole post 31, the tab bundle and the pole post platform 32, the welding thickness is reduced and the welding difficulty is reduced, making the connection of the pole post 31, the tab 21 and the pole post platform 32 more stable and improving the product yield.

[0048] It should be noted that there are various structures for insulating and sealing the electrode post 31 from the outer casing 10. In this embodiment, the electrode post 31 is insulated and sealed from the outer casing 10 by an insulating member 40. Specifically, the insulating member 40 is formed between the electrode post 31 and the mounting hole 121 by injection molding, which helps to reduce the assembly process, simplify the structure, and improve space utilization. In order to make the insulating member 40, the electrode post 31, and the outer casing 10 more tightly connected, nanopores can be formed in the electrode post 31, and / or nanopores can be formed on the first wall of the mounting hole 121 in the outer casing 10. In this way, part of the insulating member 40 can be embedded in the nanopores, resulting in a tighter connection.

[0049] It should also be noted that, specifically in this embodiment, the first wall of the outer casing 10 is an end cap 12, that is, the outer casing 10 includes a housing 11 and an end cap 12. The housing 11 has an opening, and the end cap 12 seals the opening of the housing 11. The end cap 12 and the housing 11 are connected to form a receiving cavity 110, and the end cap 12 is provided with two mounting holes 121. Correspondingly, two electrode post assemblies 30 are provided, namely a positive electrode post assembly 30 and a negative electrode post assembly 30, and both the positive and negative electrode post assemblies 30 are provided on the end cap 12. Correspondingly, the electrode assembly includes four tabs, namely two positive tabs 21 and two negative tabs 21. The two positive tabs 21 and the two negative tabs 21 are both located on the same side of the cell body 22, and the two positive tabs 21 are connected to the positive electrode post assembly 30, and the two negative tabs 21 are connected to the negative electrode post assembly 30.

[0050] Of course, in other embodiments, the housing 11 may also have two openings. In this case, two end caps 12 are provided, each sealing one of the two openings of the housing 11. The two end caps 12 and the housing 11 are connected to form a receiving cavity 110, and each end cap 12 is provided with a mounting hole 121. Correspondingly, the positive polarity electrode assembly 30 and the negative polarity electrode assembly 30 are respectively provided on the two end caps 12. Correspondingly, the two positive polarity tabs 21 and the two negative polarity tabs 21 are respectively located on both sides of the cell body 22. The two positive polarity tabs 21 are connected to the positive polarity electrode assembly 30, and the two negative polarity tabs 21 are connected to the negative polarity electrode assembly 30.

[0051] Please see Figure 4 and Figure 5 As shown, in some embodiments, the assembly relationship between the pole post 31 and the pole post platform 32 can be that the pole post 31 and the pole post platform 32 are stacked. In this case, the second segment 213 of both pole ears 21 is located between the pole post platform 32 and the pole post 31. This can be understood as the second segment 213 of one pole ear 21 being sandwiched between the pole post 31 and the pole post platform 32, and the second segment 213 of the other pole ear 21 also being sandwiched between the pole post 31 and the pole post platform 32. It can also be understood as the pole post platform 32 and the pole post... A receiving space is formed between 31, and the second section 213 of the two pole ears 21 is located in the receiving space. The second section 213 of the two pole ears 21 is in contact with the pole base 32 and the pole 31 respectively. This receiving space can be formed entirely on the side of the pole base 32 facing the pole 31, or entirely on the side of the pole 31 facing the pole base 32, or partly on the side of the pole base 32 facing the pole 31 and the other part on the side of the pole 31 facing the pole base 32.

[0052] In other embodiments, regarding the assembly relationship between the pole post 31 and the pole post platform 32, see [link to documentation]. Figure 3 Alternatively, the terminal post 31 and the terminal post platform 32 can be plugged into each other. Specifically, the terminal post 31 has a blind hole 315 on the side facing the battery cell body 22, and at least a portion of the terminal post platform 32 is accommodated in the blind hole 315.

[0053] Understandably, a blind hole 315 refers to a hole that is not completely penetrated within the pole post 31. The cross-section of the blind hole 315 can be circular, square, elliptical, or other irregular shapes. The shape of the pole post 32 can be the same as that of the blind hole 315; for example, the blind hole 315 can be cuboid, and the pole post 32 can also be cuboid. Of course, the shape of the pole post 32 can also be different from that of the blind hole 315, as long as at least a portion of the pole post 32 can be accommodated within the blind hole 315.

[0054] Thus, on the one hand, by using the blind hole 315 on the terminal post 31 to accommodate at least part of the terminal post platform 32, the space required for the terminal post 31 and the terminal post platform 32 in the height direction of the battery cell is greatly reduced, making the structure more compact, which is conducive to reducing the height of the battery cell and improving the energy density of the battery cell; on the other hand, the setting of the blind hole 315 can thin out the part of the terminal post 31 used to weld with the tab 21, further reducing the welding thickness and making the welding of the terminal post 31 and the tab 21 more secure.

[0055] It should be noted that, specifically in this embodiment, the electrode post 32 is housed within the blind hole 315, and the electrode post 32 does not protrude from the electrode post 31, thereby minimizing the space required by the electrode post 31 and the electrode post 32 in the height direction of the battery cell, and minimizing the welding thickness of the electrode post 31, the tab 21 and the electrode post 32.

[0056] It should also be noted that, in a specific embodiment, the pole post 31 includes a bottom wall 311 and an annular sidewall 313 connected to one side of the bottom wall 311. The annular sidewall 313 and the bottom wall 311 together form the aforementioned blind hole 315. The pole post platform 32 is tightly fitted to the annular sidewall 313. The second sections 213 of the two pole lugs 21 are both located between the bottom wall 311 and the pole post platform 32 of the pole post 31, and the second sections 213 of the two pole lugs 21 are both welded and fixed to the bottom wall 311 and the pole post platform 32 of the pole post 31.

[0057] Thus, since the second segment 213 of both electrode tabs 21 is located between the pole post 32 and the pole post 31, it can be understood that the second segment 213 of one electrode tab 21 is sandwiched between the bottom wall 311 of the pole post 31 and the pole post 32, and the second segment 213 of the other electrode tab 21 is also sandwiched between the bottom wall 311 of the pole post 31 and the pole post 32. It can also be understood that a space is formed between the bottom wall 311 of the pole post 31 and the pole post 32, and the second segment 213 of both electrode tabs 21... 13 are all located within the accommodating space, and the second segment 213 of the two tabs 21 are respectively in contact with the bottom wall 311 of the pole post 31 and the pole post platform 32. This accommodating space can be completely formed on the side of the pole post platform 32 facing the pole post 31, or it can be completely formed on the side of the bottom wall 311 of the pole post 31 facing the pole post platform 32, or it can be partially formed on the side of the pole post platform 32 facing the pole post 31 and the other part formed on the side of the bottom wall 311 of the pole post 31 facing the pole post platform 32.

[0058] Furthermore, in order to ensure that the pole post 31 and the pole post platform 32 can be inserted and connected securely, the pole post platform 32 is tightly fitted into the blind hole 315 on the pole post 31.

[0059] Understandably, a tight fit refers to assembling two parts where the mating dimensions are larger than the reference dimensions, causing the two parts to press against each other and form a tight fit.

[0060] Since the pole post 32 is tightly installed in the blind hole 315, it means that the pole post 32 cannot easily fall off from the blind hole 315. Therefore, ensuring that the pole post 31 and the pole post 32 are relatively fixed during the welding process is beneficial to further improve the welding quality of the pole post 31, the second section 213 of the pole lug 21 and the pole post 32.

[0061] It should be noted that there are various tight-fitting installation structures for the pole post 32 and the blind hole 315. For specific embodiments, please refer to [link / reference]. Figures 7 to 10 As shown, the electrode post 32 includes a middle portion a1 and an edge portion a2. The through hole 321 is formed in the middle portion a1 of the electrode post 32. The portion of the edge portion a2 that is close to the cell body 22 is connected to the middle portion a1, and the portion of the edge portion a2 that is away from the cell body 22 abuts against the wall of the blind hole 315.

[0062] Understandably, one or more edge portions a2 can be set. When multiple edge portions a2 are set, they are evenly distributed around the middle portion a1. The end of the edge portion a2 closest to the cell body 22 is fixedly connected to the middle portion a1, and the end of the edge portion a2 furthest from the cell body 22 is a free end, which abuts against the wall of the blind hole 315.

[0063] When the pole post 32 and pole post 31 are not assembled, a gap is formed between the free end of the edge portion a2 and the pole post 32. The trajectory line forming this gap can be straight, curved, or circular. Specifically, see [link to documentation]. Figure 7 As shown, a slit is provided on the side surface of the electrode post 32 away from the battery cell body 22. This slit is an annular groove a3. The part of the electrode post 32 located inside the annular groove a3 is the aforementioned middle part a1, and the part of the electrode post 32 located outside the annular groove a3 is the edge part a2.

[0064] Thus, after the pole post 32 is inserted into the blind hole 315 on the pole post 31, the free end of the edge portion a2 undergoes elastic deformation towards the middle portion a1 under the squeezing action of the inner wall of the blind hole 315. At this time, the free end of the edge portion a2 abuts against the hole wall of the blind hole 315, and the gap between the free end of the edge portion a2 and the pole post 32 becomes smaller or even disappears, that is, the free end of the edge portion a2 contacts the pole post 32. This design facilitates the insertion of the pole post 32 into the pole post 31 while ensuring that the pole post 32 is tightly fitted into the blind hole 315 of the pole post 31.

[0065] In some embodiments, when the second segment 213 of both tabs 21 is connected to the pole post 31 and the pole post platform 32, in order to ensure consistent welding quality, the thickness of the two tabs 21 is designed to be consistent, that is, both tabs 21 are a single tab piece, or both tabs 21 contain multiple tab pieces stacked together, and the number of tab pieces contained in each of the two tabs 21 is equal.

[0066] Thus, the thickness of the second section 213 of the two tabs 21 is equal. On the one hand, this ensures consistent welding thickness and improves the welding quality of the pole post 31, the second section 213 of the two tabs 21, and the pole post platform 32. On the other hand, it makes the surfaces of the pole post 31 that contact the second section 213 of the two tabs 21 and the surfaces of the pole post platform 32 that contact the second section 213 of the two tabs 21 more flat, which is beneficial to the processing of the pole post 31 and the pole post platform 32.

[0067] Please see again Figure 6 As shown, in some embodiments, the battery cell body 22 includes two bodies 23 arranged side by side within the receiving cavity 110. Each tab of the same polarity connected to one body 23 is brought together to form a tab 21, and each tab of the same polarity connected to the other body 23 is also brought together to form a tab 21.

[0068] It should be noted that in some embodiments, the cell body 22 may also include only one body 23, with the same polarity of the electrode tabs connected to the body 23 joined together to form an electrode tab 21, and the other electrode tabs joined together to also form an electrode tab 21. Of course, in still some embodiments, the cell body 22 includes two or more bodies 23, with the same polarity of the electrode tabs connected to a portion of the body 23 joined together to form an electrode tab 21, and the same polarity of the electrode tabs connected to another portion of the body 23 joined together to form another electrode tab 21. As long as two electrodes tabs 21 of the same polarity can be formed, no special limitation is made here.

[0069] In some embodiments, see Figure 3 , Figure 10 , Figure 11 and Figure 12 The battery cell also includes a support block 50, which is located between the electrode assembly 20 and the terminal post 32, and the support block 50 abuts against the electrode assembly 20 and the terminal post 32 abuts against the support block 50.

[0070] Thus, the support block 50 can tightly fit the pole post 32, the second section 213 of the pole lug 21, and the pole post 31 together, thereby improving the welding quality of the pole post 31, the pole post 32, and the second section 213 of the pole lug 21.

[0071] It should be noted that when a positive polarity pole assembly 30 and a negative polarity pole assembly 30 are provided on the first wall of the outer casing 10, one support block 50 can simultaneously abut against the positive polarity pole platform 32 and the negative polarity pole platform 32; or two support blocks 50 can abut against the positive polarity pole platform 32 and the negative polarity pole platform 32 respectively.

[0072] It should also be noted that, in order to better support the electrode post 32, multiple support blocks 50 can be provided around the first section 211 of the electrode tab 21, and each support block 50 abuts against the electrode assembly 20 and the electrode post 32 respectively.

[0073] Furthermore, the tab 21 also includes a third section (not shown) connecting the first section 211 and the electrode assembly 20. In order to allow the support block 50 to abut against the electrode assembly 20 and the electrode post 32 while also shaping the tab 21, the support block 50 is provided with a shaping channel 51, through which the third section of the tab 21 passes.

[0074] Understandably, the structural shape of the shaping channel 51 is determined according to the shape to be made of the third section of the tab 21. For example, the shaping channel 51 has a first shaping surface 511 and a second shaping surface 512 arranged opposite to each other along the thickness direction of the main body 23. Both the first shaping surface 511 and the second shaping surface 512 are arc surfaces, and the first shaping surface 511 is convex toward the second shaping surface 512, while the second shaping surface 512 is concave toward the first shaping surface 511.

[0075] The support block 50 abuts against the electrode post 32 and the cell body 22 respectively, and the part of the electrode tab connected to the cell body 22 is brought together to form an electrode tab 21. The electrode tab 21 passes through the shaping channel 51 and the through hole 321 in sequence and is then bent. In this way, after the support block 50, the electrode assembly 20 and the electrode post 32 are assembled, the shaping of the electrode tab 21 can be completed, and the support block 50 can abut against the electrode post 32 and the cell body 22 respectively, which is convenient to operate.

[0076] It should be noted that the support block 50 may have two shaping channels 51, with the third segments of the two tabs 21 passing through the two shaping channels 51 respectively; or there may be two support blocks 50, each with one shaping channel 51, with the third segments of the two tabs 21 passing through the shaping channels 51 of the two support blocks 50 respectively; or the support block 50 may include multiple sub-support blocks, which are spliced ​​together to form two shaping channels 51, with the third segments of the two tabs 21 passing through the two shaping channels 51 respectively, depending on the design.

[0077] It should also be noted that when the positive polarity electrode assembly 30 and the negative polarity electrode assembly 30 are provided on the first wall of the outer casing 10, the support block 50 may be provided with four shaping channels 51, with the third segments of the two positive polarity electrode tabs 21 respectively passing through two shaping channels 51, and the third segments of the two negative polarity electrode tabs 21 respectively passing through the remaining two shaping channels 51; alternatively, there may be two support blocks 50, with each of the two support blocks 50a and 50b providing two shaping channels 51, with the third segments of the two positive polarity electrode tabs 21 respectively passing through the two shaping channels 51 of one support block 50a, and the third segments of the two negative polarity electrode tabs 21 respectively passing through the two shaping channels 51 of the other support block 50b (see...). Figure 12 Alternatively, the support block 50 may include multiple sub-support blocks, which are spliced ​​together to form four shaping channels 51. The third segments of the two positive polarity tabs 21 are respectively inserted into two shaping channels 51, and the third segments of the two negative polarity tabs 21 are respectively inserted into the remaining two shaping channels 51, depending on the design.

[0078] Furthermore, an extension 52 extends from the outer periphery of the support block 50. In the extending direction of the extension 52, the extension 52 extends beyond the cell body 22, and there is a gap between the extension 52 and the housing 11.

[0079] Understandably, an extension 52 can extend from the outer periphery of the support block 50 in any direction intersecting the center line of the mounting hole 121. Specifically, in this embodiment, the extension 52 is annular, located on the outer periphery of the support block 50, and the extension 52 and the support block 50 are integrated.

[0080] The design extends the extension 52 beyond the main body 22 of the battery cell. On one hand, this allows the welding fixture to act on the extension 52 during the welding of the terminal post 31, terminal post platform 32, and electrode tab 21. This prevents the force generated during welding from pressing against the main body 22 of the battery cell through the support block 50, ensuring the quality of the main body 22. On the other hand, it also reduces the risk of damage to the main body 22 due to collision with the casing 11 during installation. Furthermore, the design includes a gap between the extension 52 and the casing 11 to prevent interference between them during installation.

[0081] It should be noted that, in order to make it easier for the support block 50 to enter the housing 11 during installation, the side wall of the extension 52 is designed as an inclined guide surface 53.

[0082] It should also be noted that the support block 50 may have both an extension 52 and a shaping channel 51; or the support block 50 may have only an extension 52 or only a shaping channel 51, depending on the design.

[0083] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The outer casing (10) has a receiving cavity (110) and a mounting hole (121) communicating with the receiving cavity (110); The electrode assembly (20) includes a cell body (22) and two tabs (21), wherein the cell body (22) is housed in the housing cavity (110), and the two tabs (21) are disposed on the side of the cell body (22) facing the mounting hole (121); The electrode assembly (30) includes an electrode post (31) and an electrode post platform (32). The electrode post (31) is disposed at the mounting hole (121), and the electrode post platform (32) is disposed on the side of the cell body (22) facing the mounting hole (121). The electrode post platform (32) has a through hole (321). Each electrode tab (21) has a first segment (211) and a second segment (213) connected to each other. The first segments (211) of the two electrode tabs (21) are both inserted through the through hole (321). The second segments (213) of the two electrode tabs (21) are both located between the electrode post platform (32) and the electrode post (31). The second segments (213) of the two electrode tabs (21) are respectively located on opposite sides of the through hole (321), and the second segments (213) of the two electrode tabs (21) are both connected to the electrode post (31) and the electrode post platform (32).

2. The battery cell according to claim 1, characterized in that, The electrode post (31) has a blind hole (315) on the side facing the cell body (22), and at least a portion of the electrode post (32) is accommodated in the blind hole (315).

3. The battery cell according to claim 2, characterized in that, The pole post (32) is tightly fitted inside the blind hole (315).

4. The battery cell according to claim 3, characterized in that, The electrode platform (32) includes a middle portion (a1) and an edge portion (a2). The through hole (321) is opened in the middle portion (a1). The part of the edge portion (a2) that is close to the cell body (22) is connected to the middle portion (a1), and the part of the edge portion (a2) that is away from the cell body (22) abuts against the hole wall of the blind hole (315).

5. The battery cell according to claim 3, characterized in that, The pole post (31) includes a bottom wall (311) and an annular side wall (313) connected to one side of the bottom wall (311). The annular side wall (313) and the bottom wall (311) enclose the blind hole (315). The pole post platform (32) is tightly fitted with the annular side wall (313). The second section (213) of the two pole ears (21) is located between the bottom wall (311) and the pole post platform (32). The second section (213) of the two pole ears (21) is connected to the bottom wall (311) and the pole post platform (32).

6. The battery cell according to claim 1, characterized in that, Each of the electrode tabs (21) includes a plurality of electrode tabs stacked together, and the number of electrode tabs included in each of the two electrode tabs (21) is equal.

7. The battery cell according to claim 1, characterized in that, The battery cell body (22) includes two bodies (23) arranged side by side in the receiving cavity (110), and each body (23) has a tab (21) on the side facing the pole post (32).

8. The battery cell according to claim 1, characterized in that, The battery cell also includes a support block (50), which is located between the cell body (22) and the electrode platform (32), and the support block (50) and the cell body (22) abut against each other, and the electrode platform (32) and the support block (50) abut against each other.

9. The battery cell according to claim 8, characterized in that, The tab (21) also includes a third section connecting the first section (211) and the battery cell body (22). The support block (50) is provided with a shaping channel (51), and the third section of the tab (21) passes through the shaping channel (51).

10. The battery cell according to claim 8, characterized in that, The outer casing (10) includes a housing (11), and an extension (52) extends from the outer periphery of the support block (50). In the extending direction of the extension (52), the extension (52) extends beyond the battery cell body (22), and there is a gap between the extension (52) and the housing (11).

11. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1 to 10.

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