Battery cell and battery cell group

Abstract

The embodiment of the utility model discloses a battery cell and a battery cell group, and relates to the technical field of new energy, the battery cell comprises a first pole core and a second pole core, the first pole core comprises a first pole core body and a plurality of first tabs connected with the first pole core body; the second pole core comprises a second pole core body and a plurality of second tabs connected with the second pole core body; wherein the plurality of first tabs comprise a first staggered layer area, the plurality of second tabs comprise a second staggered layer area, and the first staggered layer area and the second staggered layer area are complementarily matched. According to the technical scheme provided by the embodiment of the invention, the assembly stability and reliability of the battery cell are improved.

Description

Battery cells and battery packs Technical Field

[0001] The embodiments in this application relate to the field of new energy technology, and in particular to a battery cell and a battery cell assembly. Background Technology

[0002] In related technologies, battery cells can typically adopt a bipolar core structure. By having the tabs of the two cores folded together and welded to the poles of the electrode sheet, the battery cell can achieve better energy efficiency under the action of the two cores.

[0003] However, the connection points between the tabs and posts of the two cores are prone to interference, causing the tabs to easily detach from the posts, affecting the stable connection and conduction between the cores and the plate, and reducing the structural stability and reliability of the cell. Summary of the Invention

[0004] Several embodiments in this application propose a battery cell and a battery cell assembly, which aim to improve the assembly stability and reliability of the battery cell and ensure its stable operation.

[0005] One embodiment of this application proposes a battery cell including a first electrode core and a second electrode core. The first electrode core includes a first electrode core body and a plurality of first electrode tabs connected to the first electrode core body. The second electrode core includes a second electrode core body and a plurality of second electrode tabs connected to the second electrode core body. The plurality of first electrode tabs include a first misaligned region, and the plurality of second electrode tabs include a second misaligned region. The first misaligned region and the second misaligned region complement each other.

[0006] In one embodiment, the plurality of first tabs include a first base portion and a first extension portion connected together, the width of the first extension portion being smaller than the width of the first base portion; the plurality of second tabs include a second base portion and a second extension portion connected together, the width of the second extension portion being smaller than the width of the second base portion; the end of the first extension portion away from the first electrode core body and the end of the first base portion away from the first electrode core body form a first misaligned region, and the end of the second extension portion away from the second electrode core body and the end of the second base portion away from the second electrode core body form a second misaligned region.

[0007] In one embodiment, the width of the first extension is defined as d1, and the width of the first base portion is defined as D1, where D1 ≥ 2d1. And / or, the width of the second extension is defined as d2, and the width of the second base portion is defined as D2, where D2 ≥ 2d2.

[0008] In one embodiment, the battery cell further includes a plate body, the plate body having a terminal post, and the first terminal tab and the second terminal tab being connected to the terminal post.

[0009] In one embodiment, the battery cell further includes a housing, the housing having a receiving cavity, one end of the housing having a first opening communicating with the receiving cavity, the first electrode core and the second electrode core being disposed within the receiving cavity, and the plate being connected to the housing and being able to open or close the first opening.

[0010] In one embodiment, the plate includes a first cover plate that can cover or open the first opening. The first cover plate is provided with a clearance hole, through which the pole is inserted. The plate also includes a sealing member, which is disposed on the side of the first cover plate facing the accommodating cavity and surrounding the clearance hole. The side of the sealing member opposite to the first cover plate abuts against the pole.

[0011] In one embodiment, the housing is further provided with a second opening, and the battery cell is further provided with a bottom cover. The bottom cover is connected to the housing and can be opened or closed. The bottom cover includes a second cover plate and an explosion-proof valve. The second cover plate is provided with a mounting hole communicating with the accommodating cavity. The explosion-proof valve is connected to the second cover plate and closes the mounting hole.

[0012] In one embodiment, the battery cell further includes a pad, which is disposed within the receiving cavity and between the second cover plate and the first electrode core and the second electrode core, and the pad is used to support and limit the first electrode core and the second electrode core.

[0013] In one embodiment, the battery cell further includes an insulating film that wraps around the first electrode core and the second electrode core.

[0014] One embodiment of this application also proposes a cell assembly comprising at least two cells as described above connected in series and parallel.

[0015] In the various embodiments provided in this application, a cooperative structural design is adopted between the first misaligned regions of the multiple first tabs and the second misaligned regions of the multiple second tabs. During the assembly of the first and second electrode cores, the complementary cooperation of the first and second misaligned regions allows for mutual clearance, effectively preventing interference between the first and second misaligned regions and the connection points of the first and second tabs. This ensures stable power connection of the first and second electrode cores, guaranteeing the assembly stability and reliability of the battery cell. Furthermore, the cooperative connection of the first and second misaligned regions eliminates the need to cut off the misaligned regions of the tabs, effectively reducing the battery cell manufacturing and assembly steps. It also helps avoid safety hazards caused by cutting burrs, achieving better electrical and safety performance of the battery cell and improving its practicality and structural reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 is a schematic diagram of the structure of an embodiment of the first electrode core of the battery cell provided in this application;

[0018] Figure 2 is a schematic diagram of the structure of an embodiment of the second electrode core of the battery cell provided in this application;

[0019] Figure 3 is a schematic diagram of a battery cell embodiment provided in this application;

[0020] Figure 4 is a magnified view of part A in Figure 3;

[0021] Figure 5 is a structural schematic diagram of another embodiment of the battery cell provided in this application;

[0022] Figure 6 is a cross-sectional view of an embodiment of the battery cell shown in Figure 5;

[0023] Figure 7 is a partially enlarged view of one embodiment of the battery cell in Figure 6.

[0024] Explanation of icon numbers:

[0025] 100. Battery cell; 10. First electrode core; 11. First electrode tab; 111. First base portion; 113. First extension portion; 13. First misaligned zone; 20. Insulating film; 30. Second electrode core; 31. Second electrode tab; 311. Second base portion; 313. Second extension portion; 33. Second misaligned zone; 50. Plate; 51. Electrode post; 53. First cover plate; 531. Injection hole; 54. Seal; 55. Sealing pin; 56. Limiting element; 70. Housing; 71. Receptacle; 90. Bottom cover; 91. Second cover plate; 93. Explosion-proof valve; 95. Pad. Detailed Implementation

[0026] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of several embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that if directional indications (such as up, down, left, right, front, back, etc.) are involved in multiple embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0028] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0029] In related technologies, battery cells typically employ a bipolar structure. This involves welding the tabs of two cores together, facing each other, to the terminal blocks of an electrode plate, thereby achieving better energy efficiency through the interaction of the two cores. However, the connection points between the tabs and the terminal blocks of the two cores are prone to interference, causing the tabs to easily detach from the terminal blocks. This affects the stable connection and conductivity between the core and the plate, reducing the structural stability and reliability of the battery cell.

[0030] Understandably, the electrode core is composed of alternating layers of positive electrode plates, negative electrode plates, and a separator. During stacking, the tabs of multiple positive electrode plates and multiple negative electrode plates close together, allowing one side of the electrode core to form both the positive and negative electrodes, ensuring stable conductivity. However, because the tabs of multiple positive and negative electrode plates bend during folding, misaligned areas with varying terminal lengths can easily form at the ends of the tabs. To ensure overall conductivity, the tabs must avoid these misaligned areas during welding to the electrode post. When two electrode cores are connected to the electrode post facing each other, the misaligned area on one electrode core can easily obstruct the welding area between the tab and the electrode post of the other electrode core. This can interfere with the welding area of ​​the tabs, affecting the stable connection and conductivity between the electrode core and the electrode post. Currently, most assembly methods involve cutting off the misaligned areas after the tabs are joined to avoid interference between the misaligned areas. However, cutting off the misaligned areas easily generates a large number of metal burrs, which may cause problems such as short circuits and self-discharge in the battery cell, affecting the long-term reliability of the battery cell product. To address the above problems, this application proposes a battery cell 100.

[0031] Referring to Figures 1 to 7, in one embodiment of this application, the battery cell 100 includes a first electrode core 10 and a second electrode core 30. The first electrode core 10 includes a first electrode core body and a plurality of first electrode tabs 11 connected to the first electrode core body. The second electrode core 30 includes a second electrode core body and a plurality of second electrode tabs 31 connected to the second electrode core body. The plurality of first electrode tabs 11 include a first misalignment region 13, and the plurality of second electrode tabs 31 include a second misalignment region 33. The first misalignment regions 11 and the second misalignment regions 31 are connected.

[0032] It is understood that during assembly, the battery cell 100 can be arranged with the first electrode 10 and the second electrode 30 facing each other on both sides of the plate 50. By connecting the tabs of the first electrode 10 and the second electrode 30 to the terminals of the plate 50, the first electrode 10 and the second electrode 30 can be connected to the terminals of the plate 50 to achieve charging and discharging energy, ensuring the stable operation of the battery cell 100. At this time, the battery cell 100 can be assembled by stacking the first electrode 10 and the second electrode 30 together after the tabs and terminals are connected. Of course, the first electrode 10 and the second electrode 30 can also be assembled in an unfolded state. This application does not limit the assembly method of the first electrode 10 and the second electrode 30 within the battery cell 100.

[0033] In this application, by stacking multiple sheets to form a first electrode core body, multiple first tabs 11 on one side of the first electrode core body can be closed together. At this time, the side of the multiple first tabs 11 facing away from the first electrode core body can form a first misaligned region 13 due to the misaligned stacking of different sheet terminals. By stacking multiple sheets to form a second electrode core body, multiple second tabs 31 on one side of the second electrode core body can be closed together. At this time, the side of the multiple second tabs 31 facing away from the second electrode core body can form a second misaligned region 33 due to the misaligned stacking of different sheet terminals. During the production and processing of the first electrode core 10 and the second electrode core 30, the shape of the electrical terminal of the sheet of the first electrode core 10 and the shape of the electrical terminal of the sheet of the second electrode core 30 can be designed to be complementary or to be spliced ​​together. This allows the first misaligned area 13 and the second misaligned area 33 to be set together, so that when the battery cell 100 is assembled, the first misaligned area 13 and the second misaligned area 33 can be connected together to avoid each other. For example, the first misaligned area 13 and the second misaligned area 33 can be complementary and superimposed, or the first misaligned area 13 and the second misaligned area 33 can be spliced ​​together to allow the first misaligned area 13 and the second misaligned area 33 to be connected together to avoid the assembly of the first tab 11 and the second tab 31. This avoids the first misaligned area 13 and the second misaligned area 33 interfering with the connection points of the first tab 11 and the second tab 31, ensuring a stable connection between the first tab 11 and the second tab 31 and the pole post 51, and effectively improving the structural stability and ease of assembly and disassembly of the battery cell 100.

[0034] Therefore, by employing a cooperative structural design between the first misaligned regions 13 of the multiple first tabs 11 and the second misaligned regions 33 of the multiple second tabs 31, during the assembly of the first electrode core 10 and the second electrode core 30, the complementary cooperation between the first misaligned regions 13 and 33 allows for mutual clearance, effectively preventing interference between the first misaligned regions 13 and 33 and the connection points of the first tabs 11 and 31. This ensures stable power connection for the first electrode core 10 and the second electrode core 30, improving the assembly stability and reliability of the battery cell 100. Furthermore, the cooperative connection between the first misaligned regions 13 and 33 eliminates the need to cut away the misaligned regions of the tabs, effectively reducing the number of assembly steps in the battery cell 100. It also helps avoid safety hazards caused by cutting burrs, achieving better electrical and safety performance of the battery cell 100 and improving its practicality and structural reliability.

[0035] Referring to Figures 3 and 4, in one embodiment of this application, the first misaligned region 13 and the second misaligned region 33 complement each other.

[0036] In this embodiment, the first misaligned region 13 and the second misaligned region 33 can adopt a complementary shape combination structure design. For example, the first misaligned region 13 and the second misaligned region 33 can adopt a combination structure similar to an "L" shape and a combination structure similar to a "7" shape, respectively; or, for another example, the first misaligned region 13 and the second misaligned region 33 can adopt a combination structure similar to a "convex" shape and a combination structure similar to a "concave" shape, respectively. This allows the first misaligned region 13 and the second misaligned region 33 to combine and complement each other, realizing the connection and clearance between the first misaligned region 13 and the second misaligned region 33, ensuring the stable assembly and power connection of the first electrode core 10 and the second electrode core 30, and further improving the structural stability and reliability of the battery cell 100.

[0037] It should be noted that the complementary cooperation structure of the first misaligned region 13 and the second misaligned region 33 is not limited to the above-described manner. In some embodiments, the first misaligned region 13 and the second misaligned region 33 may adopt a complementary structure similar to a "C" shape. This application does not limit the complementary cooperation structure of the first misaligned region 13 and the second misaligned region 33.

[0038] Referring to Figures 1 and 2, in one embodiment of this application, a plurality of first tabs 11 include a first base portion 111 and a first extension portion 113 connected together, wherein the width of the first extension portion 113 is smaller than the width of the first base portion 111; a plurality of second tabs 31 include a second base portion 311 and a second extension portion 313 connected together, wherein the width of the second extension portion 313 is smaller than the width of the second base portion 311. The ends of the first extension portion 113 and the first base portion 111 that are opposite to the first electrode core body form a first misaligned region 13, and the ends of the second extension portion 313 and the second base portion 311 that are opposite to the second electrode core body form a second misaligned region 33.

[0039] In this embodiment, the first tab 11 may include a first base portion 111 and a first extension portion 113. The first base portion 111 is connected to one side of the first electrode core body, and the first extension portion 113 is connected to the side of the first base portion 111 facing away from the first electrode core body. By making the width of the first extension portion 113 smaller than the width of the first base portion 111, the first tab 11 can be arranged in a stepped structure. At this time, the end of the first extension portion 113 and the end of the first base portion 111 can be joined to form a first staggered region 13; the second tab 31 can be in the first... After the diode core 30 is processed and assembled, it is arranged in a sheet-like structure. The second tab 31 may include a second base portion 311 and a second extension portion 313. The second base portion 311 is connected to one side of the second electrode core body, and the second extension portion 313 is connected to the side of the second base portion 311 opposite to the second electrode core body. By making the width of the second extension portion 313 smaller than the width of the second base portion 311, the second tab 31 can be arranged in a stepped structure. At this time, the end of the second extension portion 313 and the end of the second base portion 311 can form a second staggered region 33 due to merging. In this way, by using the first tab 11 and the second tab 31 arranged in a stepped shape, when the first electrode core 10 and the second electrode core 30 are assembled facing each other, multiple first tabs 11 and multiple second tabs 31 can be assembled in a complementary manner, ensuring the complementary design of the first staggered region 13 and the second staggered region 33, and further improving the overall structural stability and reliability of the cell 100. By adopting a complementary structure similar to a step, the first tab 11 and the second tab 31 can be more easily joined together to form a complementary first misaligned region 13 and a second misaligned region 33, thereby achieving a more convenient production and assembly effect for the battery cell 100 and further improving the production efficiency of the battery cell 100.

[0040] When the battery cell 100 is connected to the plate 50 and the first tab 11 and the second tab 31, the first extension 113 of the first tab 11 and the second extension 313 of the second tab 31 can be connected side by side to the pole post 51 so that the first tab 11 and the second tab 31 are complementaryly assembled on the pole post 51, which effectively avoids the interference between the connection positions of the first tab 11 and the second tab 31 and ensures the stable connection between the first core 10 and the second core 30 and the plate 50.

[0041] It should be noted that the first extension 113 can be connected to the pole post 51 by welding, or it can be connected by patch bonding. This application does not limit the connection method between the first extension 113 and the pole post 51. The second extension 313 can be connected to the pole post 51 by welding, or it can be connected by patch bonding. This application does not limit the connection method between the second extension 313 and the pole post 51.

[0042] In this configuration, the first electrode core 10 and the second electrode core 30 can have the same electrode core structure. As shown in Figure 1, the two first electrode tabs 11 of the first electrode core 10 can be arranged as positive electrode tabs and negative electrode tabs along the width direction of the first electrode core 10. As shown in Figure 2, the two second electrode tabs 31 of the second electrode core 30 can be arranged as negative electrode tabs and positive electrode tabs along the width direction of the second electrode core 30. This allows the positive electrode first electrode tab 11 and the positive electrode second electrode tab 31 to be better staggered and the negative electrode first electrode tab 11 and the negative electrode second electrode tab 31 to be staggered when the first electrode core 10 and the second electrode core 30 are assembled facing each other. This ensures the stable assembly of the first electrode core 10 and the second electrode core 30 and further improves the structural stability and reliability of the cell 100.

[0043] Therefore, by using a complementary fit between the first tab 11 and the second tab 31 and connecting them to the pole post 51, the complementary fit between the first misaligned area 13 and the second misaligned area 33 can be better achieved. This avoids interference between the first misaligned area and the second misaligned area on the connection area of ​​the first extension 113 or the second extension 313, ensuring a stable and reliable connection between the first pole core 10 and the second pole core 30 and the plate 50. Compared to the assembly method of cutting the misaligned area before connecting the tabs to the pole post, this method can reduce the burrs after cutting the misaligned area of ​​the first tab 11 and the second tab 31, reduce safety hazards in the cell 100, and better reduce the assembly process and assembly difficulty of the cell 100, effectively improving the practicality and structural reliability of the cell 100. By making the first tab 11 adopt a structure in which the width of the first extension portion 113 is smaller than the width of the first base portion 111, and making the second tab 31 adopt a structure in which the width of the second extension portion 313 is smaller than the width of the second base portion 311, it is possible to ensure that the first misaligned region 13 and the second misaligned region 33 form a complementary structure, while better reducing the internal resistance of some structures of the first tab 11 and the second tab 31, which is beneficial to improving the energy efficiency of the battery cell 100 and achieving better charging and discharging effects of the battery cell 100.

[0044] In one embodiment of this application, the width of the first extension portion 113 is defined as d1, and the width of the first base portion 111 is defined as D1, where D1 ≥ 2d1. And / or, the width of the second extension portion 313 is defined as d2, and the width of the second base portion 311 is defined as D2, where D2 ≥ 2d2.

[0045] In this embodiment, by setting the width of the first base portion 111 to be greater than or equal to twice the width of the first extension portion 113, the internal resistance of part of the first tab 11 can be reduced better, so that electrical energy can flow better through the multiple first tabs 11, and the energy efficiency of the battery cell 100 can be further improved.

[0046] Furthermore, by setting the width of the second base portion 311 to be greater than or equal to twice the width of the second extension portion 313, the internal resistance of part of the second tab 31 can be reduced better, so that electrical energy can flow better through the multiple second tabs 31, thereby further improving the energy efficiency of the battery cell 100.

[0047] In another embodiment, the width of the first base portion 111 can be set to be greater than or equal to twice the width of the first extension portion 113, and the width of the second base portion 311 can be set to be greater than or equal to twice the width of the second extension portion 313. In this way, the internal resistance of the plurality of first tabs 11 and the plurality of second tabs 31 can be reduced to a better extent, so that the first electrode core 10 and the second electrode core 30 can achieve better energy efficiency, realize better charge and discharge performance of the battery cell 100, and further improve the practicality and structural reliability of the battery cell 100.

[0048] Referring to Figures 5 to 7, in one embodiment of this application, the battery cell 100 further includes a housing 70, a receiving cavity 71 is provided inside the housing 70, a first opening communicating with the receiving cavity 71 is provided at one end of the housing 70, a first electrode core 10 and a second electrode core 30 are disposed in the receiving cavity 71, and a plate 50 is connected to the housing 70 and is configured to open or close the first opening.

[0049] In this embodiment, the battery cell 100 can utilize the housing 70 to form a receiving cavity 71, into which the first electrode core 10 and the second electrode core 30 can be housed and assembled. The housing 70 provides a certain degree of protection for the first electrode core 10 and the second electrode core 30, ensuring the stable and reliable operation of the battery cell 100. At this time, the first electrode core 10 and the second electrode core 30 can be installed into the receiving cavity 71 through the first opening of the housing 70. By aligning the size of the plate 50 with the first opening and ensuring that the plate 50 and the housing 70 can be fitted together, the first opening can be closed after the first electrode core 10 and the second electrode core 30 are installed in the receiving cavity 71. This helps to create a more enclosed environment in the receiving cavity 71, effectively reducing the impact of the external environment on the first electrode core 10 and the second electrode core 30, achieving better protection for the battery cell 100, ensuring its stable operation, and further improving the structural stability and reliability of the battery cell 100.

[0050] The plate 50 can be connected to the housing 70 using a snap-fit ​​structure; or, the plate 50 and the housing 70 can be connected using bolts or screws; or, a sliding block structure can be provided between the plate 50 and the housing 70, allowing the plate 50 to slide on the housing 70 to be assembled and disassembled; of course, there are many other ways to connect the plate 50 and the housing 70. This application does not limit the connection method between the plate 50 and the housing 70, as long as it can facilitate the assembly and disassembly of the plate 50 and the housing 70.

[0051] Referring to Figures 3 to 5, in one embodiment of this application, the plate body 50 includes a first cover plate 53, which can cover or open a first opening. The first cover plate 53 is provided with a clearance hole, and the pole post 51 passes through the clearance hole. The plate body 50 also includes a sealing member 54, which is provided on the side of the first cover plate 53 facing the receiving cavity 71 and is arranged around the clearance hole. The side of the sealing member 54 facing away from the first cover plate 53 abuts against the pole post 51.

[0052] The plate 50 allows the first cover plate 53 to be configured to match the first opening size of the housing 70, and the first cover plate 53 to be connected to the housing 70. A sealing element 54 is provided on the side of the first cover plate 53 facing the housing 70. This sealing element 54 can include, but is not limited to, gaskets, sealing rings, or sealant. The sealing element 54 seals the gap between the inner wall of the clearance hole and the electrode post 51, creating a better sealed environment within the accommodating cavity 71. This effectively prevents electrolyte leakage from the cell 100 through the gap between the clearance hole and the electrode post 51, ensuring the stable operation of the cell 100. Simultaneously, the sealing element 54 also helps to prevent dust, sand, and other impurities from the external environment from entering the accommodating cavity 71 and affecting the first electrode core 10 and the second electrode core 30, further ensuring the stable operation of the cell 100 and improving its structural stability and reliability.

[0053] Referring to Figures 4 and 5, in one embodiment of this application, the plate body 50 is provided with an injection hole 531 communicating with the accommodating cavity 71, and the plate body 50 includes a sealing pin 55, which is detachably inserted into the injection hole 531.

[0054] In this embodiment, by providing an injection hole 531 on the plate 50, electrolyte can be injected into the cavity 71 after the plate 50 and the housing 70 are connected and sealed. This allows the electrolyte to better penetrate into the first electrode core 10 and the second electrode core 30, ensuring stable charging and discharging operation of the cell 100. At this time, by using a sealing pin 55 inserted into the injection hole 531, when electrolyte needs to be injected into the cavity 71, the sealing pin 55 can be removed to open the injection hole 531, allowing the electrolyte to be stably injected into the cavity 71. After the cell 100 has been injected, the sealing pin 55 can be inserted into the injection hole 531 to seal it, preventing electrolyte leakage from the cavity 71 and ensuring a tight seal within the cavity 71, further improving the structural stability and reliability of the cell 100.

[0055] Furthermore, when the plate body 50 is provided with two pole posts 51 that are respectively connected to the positive and negative tabs of the first electrode core 10 and the second electrode core 30, by setting the liquid injection hole 531 between the two pole posts 51, the liquid injection position of the battery cell 100 can be better positioned closer to the central area of ​​the battery cell 100. This allows the electrolyte to flow more evenly and wet the first electrode core 10 and the second electrode core 30 after being injected into the receiving cavity 71. This helps to better reduce the liquid injection blind zone in the battery cell 100 and further improve the practicality and structural reliability of the battery cell 100.

[0056] Referring to Figures 6 and 7, in one embodiment of this application, the battery cell 100 further includes a limiting member 56, which is connected to the plate 50 and disposed in the receiving cavity 71. The limiting member 56 abuts against the first electrode core 10 and the second electrode core 30.

[0057] By connecting a limiting member 56 to the plate surface of the plate 50 facing the receiving cavity 71, the limiting member 56 can abut against the side of the first electrode core 10 and the second electrode core 30 facing the plate 50 within the receiving cavity 71. This allows the limiting member 56 to limit the first electrode core 10 and the second electrode core 30 to a certain extent, ensuring the overall structural stability of the first electrode core 10 and the second electrode core 30 after assembly within the receiving cavity 71. This prevents the first electrode core 10 and the second electrode core 30 from shifting or vibrating within the receiving cavity 71, better ensuring the stable and reliable operation of the battery cell 100, and further improving the structural stability and reliability of the battery cell 100.

[0058] The limiting member 56 can be made of a certain elastic colloidal material, which can provide a certain buffering effect on the first electrode core 10 and the second electrode core 30; or it can be made of a plastic material with a hardness lower than that of the first electrode core 10 and the second electrode core 30, so as to prevent the limiting member 56 from squeezing and damaging the first electrode core 10 and the second electrode core 30, and to ensure the overall structural stability of the battery cell 100; of course, the material and shape of the limiting member 56 can be many different, and this application does not limit them.

[0059] Referring to Figures 5 and 6, in one embodiment of this application, the housing 70 is further provided with a second opening, and the battery cell 100 is further provided with a bottom cover 90. The bottom cover 90 is connected to the housing 70 and can be opened or closed. The bottom cover 90 includes a second cover plate 91 and an explosion-proof valve 93. The second cover plate 91 is provided with a mounting hole communicating with the accommodating cavity 71, and the explosion-proof valve 93 is connected to the second cover plate 91 and closes the mounting hole.

[0060] In this embodiment, the second opening can be an opening on the housing 70 opposite to the first opening, so that the housing 70 is configured as a hollow cylindrical structure. This facilitates the easier installation of the first electrode core 10 and the second electrode core 30 into the receiving cavity 71 of the housing 70, further improving the ease of assembly and disassembly of the battery cell 100. At this time, the battery cell 100 can be connected to the housing 70 using the bottom cover 90. By opening and closing the second opening using the bottom cover 90, the receiving cavity 71 of the housing 70 can be better sealed by the bottom cover 90 and the plate 50 after the first electrode core 10 and the second electrode core 30 are assembled. This helps to better improve the overall protection effect of the battery cell 100, further improving the practicality and structural reliability of the battery cell 100.

[0061] By installing an explosion-proof valve 93 on the bottom cover 90, the explosion-proof valve 93 can be opened to release the gas generated inside the battery cell 100 when a fault such as thermal runaway occurs. This prevents the gas pressure in the accommodating cavity 71 from becoming too high, which could lead to an explosion of the battery cell 100. This allows the battery cell 100 to achieve better safety performance, reduces the safety hazards of the battery cell 100, and further improves the practicality and reliability of the battery cell 100.

[0062] Referring to Figure 5, in one embodiment of this application, the battery cell 100 further includes a pad 95, which is disposed in the accommodating cavity 71 and between the second cover plate 91 and the first electrode 10 and the second electrode 30. The pad 95 is used to support and limit the first electrode 10 and the second electrode 30.

[0063] In this embodiment, a pad 95 can be provided between the bottom cover 90 and the first electrode 10 and the second electrode 30. The pad 95 abuts against the first electrode 10 and the second electrode 30, which can limit the first electrode 10 and the second electrode 30. This helps to prevent the first electrode 10 and the second electrode 30 from shifting or shaking in the accommodating cavity 71, ensuring a stable connection between the first electrode 10 and the second electrode 30 and the plate 50, and further improving the structural stability and reliability of the battery cell 100.

[0064] Under the action of the pad 95, the first electrode core 10 and the second electrode core 30 can form a certain exhaust channel with the explosion-proof valve 93, so that the gas generated by the battery cell 100 when a fault occurs can be discharged more quickly and smoothly through the explosion-proof valve 93, reducing the blockage of the exhaust gas path in the accommodating cavity 71, and further improving the safety performance of the battery cell 100.

[0065] Furthermore, when a limiting member 56 is provided on the side of the plate 50 facing the receiving cavity 71, the limiting member 56 and the pad 95 can respectively abut against the opposite sides of the first electrode core 10 and the second electrode core 30, so that the first electrode core 10 and the second electrode core 30 can be better limited in the receiving cavity 71, better preventing the first electrode core 10 and the second electrode core 30 from shifting or shaking in the receiving cavity 71, ensuring the stable operation of the battery cell 100, and further improving the structural stability and reliability of the battery cell 100.

[0066] Referring to Figures 5 and 6, in one embodiment of this application, the battery cell 100 further includes an insulating film 20, which wraps around the first electrode core 10 and the second electrode core 30.

[0067] In this embodiment, after the first electrode core 10 and the second electrode core 30 are assembled together, the battery cell 100 can be wrapped with an insulating film 20. This allows the first electrode core 10 and the second electrode core 30 to be better enclosed and formed as a whole, reducing relative interference and collision between the first electrode core 10 and the second electrode core 30, and achieving a more regular and stable overall assembly effect for the battery cell 100. Furthermore, the insulating film 20 can also isolate the conductivity between the first electrode core 10 and the second electrode core 30 and the housing 70, achieving better insulation protection inside and outside the battery cell 100, better ensuring the stable operation of the battery cell 100, and further improving the structural stability and reliability of the battery cell 100.

[0068] This application also proposes a battery cell assembly, which includes at least two battery cells 100 connected in series and parallel. The specific structure of the battery cell 100 is as described in the above embodiments. Since this battery cell assembly adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0069] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The first electrode core includes a first electrode core body and a plurality of first electrode tabs connected to the first electrode core body; The second electrode core includes a second electrode core body and a plurality of second electrode tabs connected to the second electrode core body; wherein the plurality of first electrode tabs include a first misaligned region, and the plurality of second electrode tabs include a second misaligned region, and the first misaligned region and the second misaligned region complement each other.

2. The battery cell as described in claim 1, characterized in that, The plurality of first tabs include a first base portion and a first extension portion connected together, wherein the width of the first extension portion is smaller than the width of the first base portion; the plurality of second tabs include a second base portion and a second extension portion connected together, wherein the width of the second extension portion is smaller than the width of the second base portion; the end of the first extension portion away from the first electrode core body and the end of the first base portion away from the first electrode core body form a first misaligned region, and the end of the second extension portion away from the second electrode core body and the end of the second base portion away from the second electrode core body form a second misaligned region.

3. The battery cell as described in claim 2, characterized in that, Define the width of the first extension as d1, define the width of the first base portion as D1, D1≥2d1; and / or, define the width of the second extension as d2, define the width of the second base portion as D2, D2≥2d2.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The battery cell also includes a plate, and the plate is provided with a terminal post, with the first electrode and the second electrode connected to the terminal post.

5. The battery cell as described in claim 4, characterized in that, The battery cell also includes a housing, which has a cavity inside. One end of the housing has a first opening that communicates with the cavity. The first electrode and the second electrode are disposed in the cavity. The plate is connected to the housing and can open or close the first opening.

6. The battery cell as described in claim 5, characterized in that, The plate includes a first cover plate, which can cover or open the first opening. The first cover plate is provided with a clearance hole, through which the pole post passes. The plate also includes a sealing member, which is provided on the side of the first cover plate facing the accommodating cavity and surrounding the clearance hole. The side of the sealing member opposite to the first cover plate abuts against the pole post.

7. The battery cell as described in claim 5, characterized in that, The housing is further provided with a second opening, and the battery cell is further provided with a bottom cover. The bottom cover is connected to the housing and can be opened or closed. The bottom cover includes a second cover plate and an explosion-proof valve. The second cover plate is provided with a mounting hole communicating with the accommodating cavity. The explosion-proof valve is connected to the second cover plate and closes the mounting hole.

8. The battery cell as described in claim 7, characterized in that, The battery cell also includes a pad, which is disposed within the accommodating cavity and between the second cover plate and the first electrode core and the second electrode core. The pad is used to support and limit the first electrode core and the second electrode core.

9. The battery cell as described in claim 5, characterized in that, The battery cell also includes an insulating film that wraps around the first electrode core and the second electrode core.

10. A battery cell assembly, characterized in that, It includes at least two cells connected in series or parallel as described in any one of claims 1 to 9.

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