Battery cell, battery pack and vehicle

Abstract

The invention provides a battery cell, a battery pack and a vehicle, the battery cell comprises: a shell having an accommodating space inside; the pole column is installed on the shell from the exterior of the shell, the pole column is provided with a through hole, the hole axis of the through hole is arranged in the height direction of the pole column, and the through hole is communicated with the containing space; at least part of the polar plate penetrates into the through hole from the accommodating space and is conductively connected with the polar column; and the roll core is arranged in the accommodating space, and at least part of the tabs of the roll core penetrate into the through holes from the accommodating space and are conductively connected with the polar plates. According to the battery cell, the pole is mounted on the shell from the outside of the shell, so that the assembly difficulty of the shell and the pole is reduced, the assembly efficiency is improved, before the roll core is assembled in the shell, the pole plate and the pole lug can be welded firstly, the pole lug can be fixed conveniently, the welding operation of the pole plate and the pole lug is convenient, and the forming difficulty of the battery cell is reduced; during shell-in assembly, the polar plates and the tabs synchronously penetrate into the through holes of the polar columns from the accommodating spaces, so that the lengths of the tabs can be greatly shortened, and the connection impedance of the battery cell is reduced.

Description

Technical Field

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

[0002] In the cell structure of the related technology, a hollow pole base is installed on the cell shell, and a stepped structure is set on the inner wall of the hollow part. The pole lug of the core extends out from the through hole of the pole base and is welded to the pole on the outside. After welding, the pole lug is bent, the pole is pressed down to the stepped structure of the pole base, and finally the pole and the pole base are welded and sealed.

[0003] In this cell structure, the terminal base is installed on the shell wall from inside the shell. The installation of the terminal base is inconvenient and reduces assembly efficiency. Furthermore, the core is first installed inside the shell, and the tabs extend out from the through holes of the terminal base before welding the tabs to the terminal. Because the tab material is relatively soft and the tabs are located inside the through holes of the terminal base, it is inconvenient to fix the tabs, making it difficult to align the tabs with the terminal and resulting in poor welding convenience. In addition, the tabs need to extend out from the through holes of the terminal base before welding to the terminal, and the tabs are relatively long, resulting in high connection impedance of the cell. Summary of the Invention

[0004] The purpose of this application is to provide a battery cell, a battery pack, and a vehicle that improves the efficiency of battery cell assembly, enhances the convenience of conductive connection operations, and reduces the connection impedance of the battery cell.

[0005] To address the aforementioned technical problems, this application provides a battery cell, comprising:

[0006] A housing, the interior of which has a receiving space;

[0007] An electrode post is mounted on the housing from the outside of the housing. The electrode post has a through hole, the axis of which is set along the height direction of the electrode post, and the through hole communicates with the receiving space.

[0008] An electrode plate, at least a portion of which passes through the receiving space into the through hole and is electrically connected to the electrode post;

[0009] A core is disposed within the receiving space, and at least a portion of the tabs of the core pass through the receiving space into the through hole and are electrically connected to the electrode plate.

[0010] In this embodiment, the electrode post is installed on the casing from the outside of the casing. Compared with the related technology where the electrode post is installed from the inside of the casing, the installation of the electrode post is more convenient and improves the assembly efficiency of the battery cell. At the same time, the structural form of the electrode plate and electrode post in this embodiment determines that before the core is installed inside the casing during the battery cell forming process, the electrode plate and electrode tab can be electrically connected first. For example, in this embodiment, the electrode plate and electrode tab are fixed by welding and assembled to form a core assembly. Then, the core assembly is installed inside the casing, with the electrode plate and electrode tab facing the through hole of the electrode post. The electrode plate and electrode tab pass through the through hole through the receiving space until the electrode plate and electrode post are positioned and matched. Finally, the electrode plate and electrode post are electrically connected. For example, in this embodiment, the electrode plate and electrode post are fixed by welding. Therefore, it can be seen that the tabs in this embodiment are not restricted by the shell and the pole during welding, making it easier to fix the tabs. The plate and the tab can be better aligned, and the welding operation of the plate and the tab is convenient, reducing the difficulty of cell forming and improving cell production efficiency. During the core assembly insertion process, the plate and the tab are simultaneously inserted into the through hole of the pole through the receiving space. The plate and the tab are installed in the same direction, the length of the tab can be greatly shortened, the transmission path of the tab current is greatly reduced, the connection impedance of the cell is significantly reduced, and the fast charging performance of the battery is improved.

[0011] This application also provides a battery pack including the aforementioned battery cells.

[0012] The battery pack of this application includes the aforementioned battery cell, and therefore has the same technical effects as the aforementioned battery cell, which will not be repeated here.

[0013] This application also provides a vehicle including the aforementioned battery pack.

[0014] The vehicle in this application includes the aforementioned battery pack, and therefore has the same technical effects as the aforementioned battery pack, which will not be repeated here. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the first specific embodiment of the battery cell provided in this application;

[0016] Figure 2 for Figure 1 A partial cross-sectional view of the battery cell along the AA direction;

[0017] Figure 3 for Figure 2 A magnified view of a portion of region A in the middle;

[0018] Figure 4 This is a partial cross-sectional view of the second specific embodiment of the battery cell provided in this application;

[0019] Figure 5 for Figure 4A schematic diagram of the connection between the middle shell and the pole post;

[0020] Figure 6 for Figure 5 Schematic diagram of the middle shell structure;

[0021] Figure 7 for Figure 5 A schematic diagram of the structure of the central electrode post, upper plastic component, and retaining ring;

[0022] Figure 8 for Figure 5 Schematic diagram of the middle sealing component;

[0023] Figure 9 for Figure 1 A schematic diagram of the first angle of the electrode plate support in the battery cell;

[0024] Figure 10 for Figure 9 A schematic diagram of the second angle of the electrode plate support;

[0025] Figure 11 A partial cross-sectional view of the winding core assembly in the third specific embodiment of the battery cell provided in this application;

[0026] Figure 12 A partial cross-sectional view of the winding core assembly in the fourth specific embodiment of the battery cell provided in this application;

[0027] Figure 13 for Figure 1 A schematic diagram of the core assembly in a battery cell;

[0028] Figure 14 for Figure 13 A magnified view of a portion of the core in the core assembly;

[0029] Figure 15 for Figure 13 A schematic diagram of the first angle of the core support in the core assembly;

[0030] Figure 16 for Figure 13 A schematic diagram of the second angle of the core support in the core assembly;

[0031] Figure 17 for Figure 1 A breakdown diagram of the battery cell;

[0032] Figure 18 for Figure 16 Partial diagram of the middle shell;

[0033] Figure 19 This is a breakdown diagram of the fifth specific embodiment of the battery cell provided in this application;

[0034] Figure 20This is a breakdown diagram of the sixth specific embodiment of the battery cell provided in this application;

[0035] in, Figures 1-20 The accompanying figure labels are as follows:

[0036] 11-Shell shell; 11a-Pole post hole; 11b-Countertop; 11c-Stepped section; 111-Shell wall; 11A-Shell body; 11A1-Bottom wall; 11B-Cover plate;

[0037] 12-Pole post; 12a-Through hole; 121-First locking part; 122-Second locking part; 123-Third locking part; 12A-Positive pole post; 12B-Negative pole post;

[0038] 13-Plastic coating; 14-Snap ring; 15-Seal; 16-Explosion-proof valve;

[0039] 21-Core; 211-Electrode; 2111-Bending section;

[0040] 22-Electrode plate; 22A-Positive electrode plate; 22B-Negative electrode plate; 221-First electrode plate section; 222-Second electrode plate section;

[0041] 23-Electrode plate support; 23a-Protruding structure; 231-Rib; 2311-First rib; 2312-Second rib; 232-Positioning post;

[0042] 24-Core support; 241-Electrode tab baffle; 242-Core support body; 24a-Allowing hole; 24b-Positioning hole;

[0043] a-concave part; b-convex part. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] In this article, the side closer to the inside of the housing 11 is called the "inner side", and the side farther away from the inside of the housing 11 is called the "outer side".

[0046] Please refer to Figures 1-6 , Figure 1 This is a schematic diagram of the structure of the first specific embodiment of the battery cell provided in this application; Figure 2 for Figure 1 A partial cross-sectional view of the battery cell along the AA direction; Figure 3 for Figure 2 A magnified view of a portion of region A in the middle; Figure 4 This is a partial cross-sectional view of the second specific embodiment of the battery cell provided in this application; Figure 5 for Figure 4 A schematic diagram of the connection between the middle shell and the pole post; Figure 6 for Figure 5 A schematic diagram of the middle shell structure.

[0047] This embodiment provides a battery cell, including:

[0048] The housing 11 has an internal accommodating space;

[0049] The pole post 12 is mounted on the housing 11 from the outside of the housing 11. The pole post 12 has a through hole 12a. The hole axis of the through hole 12a is set along the height direction of the pole post 12. The through hole 12a connects to the receiving space.

[0050] The electrode 22, at least a portion of which passes through the receiving space into the through hole 12a, and is electrically connected to the electrode post 12;

[0051] The core 21 is disposed within the receiving space, and at least a portion of the tabs 211 of the core 21 passes through the receiving space into the through hole 12a and is electrically connected to the electrode plate 22.

[0052] In this embodiment of the battery cell, the terminal 12 is installed on the housing 11 from the outside of the housing 11. Compared with the related technology where the terminal is installed from the inside of the housing, the installation of the terminal 12 is more convenient and improves the assembly efficiency of the battery cell. At the same time, the structural form of the electrode plate 22 and the terminal 12 in this embodiment determines that before the core 21 is installed inside the housing 11 during the battery cell forming process, the electrode plate 22 and the tab 211 can be electrically connected. For example, in this embodiment, the electrode plate 22 and the tab 211 are fixed by welding and assembled to form a core assembly. Then, the core assembly is installed inside the housing 11, with the electrode plate 22 and the tab 211 facing the through hole 12a of the terminal 12. The electrode plate 22 and the tab 211 pass through the through hole 12a from the receiving space until the electrode plate 22 and the terminal 12 are positioned and matched. Finally, the electrode plate 22 and the terminal 12 are electrically connected. For example, in this embodiment, the electrode plate 22 and the terminal 12 are fixed by welding. Therefore, in this embodiment, the tab 211 is not restricted by the shell 11 and the pole post 12 during welding, which makes it easier to fix the tab 211. The plate 22 and the tab 211 can be better aligned, and the welding operation of the plate 22 and the tab 211 is convenient, reducing the difficulty of cell forming and improving the cell production efficiency. During the process of inserting the core assembly into the shell, the plate 22 and the tab 211 are inserted into the through hole 12a of the pole post 12 through the receiving space. The plate 22 and the tab 211 are installed in the same direction, the length of the tab 211 can be greatly shortened, the transmission path of the tab current is greatly reduced, the connection impedance of the cell is significantly reduced, and the fast charging performance of the battery is improved.

[0053] As previously described, at least a portion of the electrode plate 22 passes through the receiving space into the through hole 12a. In some embodiments, all of the electrode plate 22 passes through the receiving space into the through hole 12a; in other embodiments, the end of the electrode plate 22 away from the core 21 passes through the receiving space into the through hole 12a, and the end of the electrode plate 22 near the core 21 is located inside the housing 11.

[0054] As previously described, at least a portion of the tabs 211 of the core 21 pass through the through hole 12a via the receiving space. In some embodiments, all of the tabs 211 pass through the through hole 12a via the receiving space; in other embodiments, the end of the tab 211 away from the core 21 passes through the through hole 12a via the receiving space, and the end of the tab 211 near the core 21 is located inside the housing 11.

[0055] Please continue to refer to this. Figures 3-6 In some embodiments of this application, the battery cell also includes an upper plastic layer 13;

[0056] The housing 11 is provided with a pole hole 11a, and the pole 12 has a snap-fit ​​part. The pole 12 is fixed to the upper plastic 13 through the snap-fit ​​part. The orthographic projection of the through hole 12a toward the housing 11 is located inside the outline of the pole hole 11a.

[0057] In this embodiment, the pole post 12 is provided with a snap-fit ​​part, and is fixed by the snap-fit ​​part and the upper plastic 13 to ensure a reliable connection between the pole post 12 and the upper plastic 13. The upper plastic 13 participates in fixing the housing 11 and the pole post 12, ensuring a reliable connection between the housing 11 and the pole post 12. The orthogonal projection of the through hole 12a toward the housing 11 is located inside the outline of the pole post hole 11a, ensuring that the tab 211 and the electrode plate 22 can smoothly pass into the through hole 12a of the pole post 12, realizing the conductive connection between the electrode plate 22 and the pole post 12.

[0058] Among them, such as Figure 3 As shown, in this embodiment, the pole post 12 passes through the pole post hole 11a. The locking part includes a first locking part 121 and a second locking part 122 located at both ends of the pole post 12 along the height direction. The first locking part 121 is located outside the housing 11 and the size of the first locking part 121 is larger than the size of the pole post hole 11a. The second locking part 122 is located inside the housing 11 and the size of the second locking part 122 is smaller than the size of the pole post hole 11a.

[0059] The upper plastic 13 includes a first groove and a first protrusion. The first groove covers at least a portion of the shell wall 111 of the shell 11, which is provided with the pole hole 11a. The first protrusion engages with the snap-fit ​​part.

[0060] As configured above, the size of the first latching portion 121 is larger than the size of the electrode post hole 11a, and the size of the second latching portion 122 is smaller than the size of the electrode post hole 11a, ensuring that the electrode post 12 can be inserted into the electrode post hole 11a from the outside of the housing 11 to the inside of the housing 11; simultaneously, by Figure 3 As can be seen, in the upper plastic 13, the first protrusion forms a first groove inside, and the first groove wraps around at least part of the shell wall 111 of the shell 11 where the pole hole 11a is provided. The first protrusion is engaged between the first engaging part 121 and the second engaging part 122 along the height direction, thereby fixing the pole 12 and the shell 11. The first engaging part 121 and the second engaging part 122 can play a bearing role when the cell is subjected to force in the height direction, improving the bearing capacity of the cell in the height direction and ensuring a reliable connection between the pole 12 and the shell 11.

[0061] In practice, the upper plastic 13 can be an injection molded part, and the pole post 12 and the housing 11 are injection molded together. Specifically, the pole post 12 and the housing 11 can be connected using a nano-injection molding process to ensure the reliability of the connection between the pole post 12 and the housing 11.

[0062] To improve the sealing performance between the electrode post 12 and the housing 11, the surfaces of the electrode post 12 and the housing 11 can be pretreated before the injection molding process. After pretreatment, the surfaces of the electrode post 12 and the housing 11 have a microporous structure. The nano-sized injection molding material can fill the interior of the microporous structure, thereby improving the sealing performance between the upper plastic 13 and the metal bonding surface.

[0063] Therefore, in this embodiment, the sealing performance of the housing 11 and the electrode post 12 can be guaranteed by the upper plastic 13, without the need for a separate sealing ring. The second snap-fit ​​part 122 only serves as a load-bearing component and is smaller in size. In contrast, in the cell structure of related technologies, the inside of the electrode post is usually provided with a support part that folds outward in the lateral direction. The sealing ring is pressed between the support part and the inner wall of the housing to achieve a sealed connection between the electrode post and the housing. In order to ensure the structural reliability of the support part, the thickness of the support part is usually relatively thick, resulting in a larger space occupation of the electrode post and reducing the height space utilization rate of the cell. Therefore, compared with the cell structure of related technologies, this embodiment can reduce the height space occupation of the electrode post 12 inside the housing 11 and improve the height space utilization rate of the cell.

[0064] Furthermore, by Figure 3 As can be seen, in this embodiment, part of the upper plastic 13 extends upward along the height direction of the pole post 12 and fits against the outer wall of the first snap-fit ​​part 121, ensuring that the upper plastic 13 can completely separate the pole post 12 and the housing 11, and ensuring the insulation performance of the pole post 12 and the housing 11.

[0065] Furthermore, in this embodiment, the inner wall of the housing 11 is provided with a notch, the notch is provided around the pole hole 11a and communicates with the pole hole 11a, and part of the upper plastic 13 is located inside the notch.

[0066] In this way, the notch can accommodate the upper plastic 13 inside the casing 11, reducing the height space occupied by the upper plastic 13 and improving the height space utilization of the battery cell.

[0067] Please continue to refer to this. Figures 4-8 , Figure 7 for Figure 5 A schematic diagram of the structure of the central electrode post, upper plastic component, and retaining ring; Figure 8 for Figure 5 A schematic diagram of the structure of the central sealing component.

[0068] In this embodiment, the pole post 12 is located outside the housing 11, and the snap-fit ​​part includes a third snap-fit ​​part 123 located at one end of the pole post 12 near the core 21. The upper plastic 13 has a fixing part and a second groove. The fixing part is fixed to the housing 11, and the second groove engages with the third snap-fit ​​part 123.

[0069] Thus, the terminal 12 is engaged with the upper plastic 13 via the third snap-fit ​​part 123, and the upper plastic 13 is simultaneously fixedly connected to the housing 11 via the fixing part, thereby fixing the terminal 12 to the housing 11 and ensuring a reliable connection between the terminal 12 and the housing 11. Furthermore, in this application, the terminal 12 is directly fixed to the outside of the housing 11, and the terminal 12 no longer occupies the internal height space of the housing 11, improving the utilization rate of the cell's height space.

[0070] In some embodiments, the electrode post 12 and the housing 11 can be fixed by an upper plastic 13. The upper plastic 13 can be an injection molded part, that is, the electrode post 12 and the housing 11 are injection molded together. Specifically, the electrode post 12 and the housing 11 can be injection molded together using a nano-injection molding process to ensure the reliability of the connection between the electrode post 12 and the housing 11. In this case, the fixing part also includes a recessed part. The opening end of the recessed part faces the housing wall 111 of the housing 11 with the electrode post hole 11a. The housing wall 111 of the housing 11 with the electrode post hole 11a is at least partially wrapped inside the recessed part, realizing the snap-fit ​​engagement between the upper plastic 13 and the housing 11.

[0071] To improve the sealing performance between the electrode post 12 and the housing 11, the surfaces of the electrode post 12 and the housing 11 can be pretreated before the injection molding process. After pretreatment, the surfaces of the electrode post 12 and the housing 11 have a microporous structure. The nano-sized injection molding material can fill the interior of the microporous structure, thereby improving the sealing performance between the upper plastic 13 and the metal bonding surface.

[0072] In other embodiments, such as Figure 4 and Figure 5As shown, the battery cell also includes a retaining ring 14, which is connected to the housing 11;

[0073] The fixing part includes a third groove, which encloses the retaining ring 14.

[0074] Thus, in this embodiment, the fixing part is fixed to the housing 11 by the retaining ring 14, and the third snap-fit ​​part 123 is located between the housing 11 and the retaining ring 14. The housing 11 and the retaining ring 14 can bear the load when the cell is subjected to force in the height direction, thereby improving the load-bearing capacity of the cell in the height direction and ensuring a reliable connection between the terminal 12 and the housing 11. At the same time, the retaining ring 14 and the terminal 12 are separated by the upper plastic 13, which can ensure the insulation performance between the terminal 12 and the housing 11.

[0075] like Figure 7 As shown, in practice, the pole post 12 and the retaining ring 14 can be injection molded together to form an integral structure. Then, the integral structure can be installed on the outside of the housing 11 and the retaining ring 14 and the housing 11 can be connected to fix the pole post 12 and the housing 11.

[0076] The retaining ring 14 and the housing 11 can be fixed by welding, such as ultrasonic welding or laser welding, to ensure a reliable connection between the retaining ring 14 and the housing 11.

[0077] Furthermore, by Figure 6 As can be seen, in this embodiment, the housing 11 is provided with a recessed platform 11b, the pole hole 11a is located inside the recessed platform 11b, and the orthogonal projection of the pole 12 toward the housing 11 is located inside the recessed platform 11b.

[0078] Thus, the recessed platform 11b can accommodate the electrode post 12, reducing the outer height of the electrode post 12, making the battery cell of this embodiment suitable for application scenarios where the outer height of the electrode post 12 is limited.

[0079] Depend on Figure 6 As can be seen, the shell wall 111 of the housing 11, which has the terminal hole 11a, has a protrusion extending into the interior of the housing 11, and a recessed platform 11b is formed inside the protrusion. In practice, the depth of the recessed platform 11b is related to the outer height of the terminal 12. In some application scenarios where the outer height of the terminal 12 is not limited, it is feasible not to set such a recessed platform 11b or to have a smaller depth of the recessed platform 11b. In this case, the protrusion occupies less of the internal height space of the housing 11, thereby improving the utilization rate of the height space of the battery cell.

[0080] Please continue to refer to this. Figures 5-6 In this embodiment, the inner wall of the recessed platform 11b is provided with a stepped portion 11c facing the outside of the housing 11, and the lateral outer end of the retaining ring 14 is fixedly connected to the stepped portion 11c.

[0081] As configured above, the stepped portion 11c can provide a stable connection position for the retaining ring 14, ensuring a reliable connection between the retaining ring 14 and the housing 11; at the same time, the lateral outer end of the retaining ring 14 extends into the interior of the recessed platform 11b and then connects with the housing 11, which helps to reduce the outer height of the pole post 12.

[0082] Furthermore, in this embodiment, the shell wall 111 with the pole hole 11a of the housing 11 is sealed to the pole 12 to ensure the sealing performance of the pole 12 and the housing 11.

[0083] Among them, such as Figures 5-8 As shown, in this embodiment, the battery cell also includes a sealing element 15, which is press-fitted between the terminal post 12 and the housing 11. The sealing element 15 can play a sealing role and ensure the sealing performance between the terminal post 12 and the housing 11.

[0084] Specifically, in this embodiment, the side wall of the housing 11 facing the pole post 12 is provided with a protrusion b, and the sealing member 15 is provided with a recess a on the wall surface facing the housing 11. The recess a and the protrusion b are inserted into each other.

[0085] The insertion and fitting of the recessed part a and the convex part b can limit the sealing element 15, ensuring that the sealing element 15 is always in the preset installation position and thus stably perform the sealing function, thereby improving the sealing performance of the housing 11 and the pole post 12.

[0086] It is understandable that, in practice, it is feasible to have a recess a on the wall surface of the housing 11 facing the seal 15 and a protrusion b on the wall surface of the seal 15 facing the housing 11. Alternatively, in practice, it is feasible to have a recess a on one of the opposing walls of the pole post 12 and the seal 15 and a protrusion b on the other, which can also achieve the above-mentioned technical effect.

[0087] Please continue to refer to this. Figure 3 , Figure 4 , Figure 9 and Figure 10 , Figure 9 for Figure 6 A schematic diagram of the first angle of the electrode plate support in the core assembly; Figure 10 for Figure 6 A schematic diagram of the second angle of the electrode plate support in the core assembly.

[0088] In this embodiment, the battery cell also includes:

[0089] Electrode support 23 is located between the end face of the core 21 near the pole post 12 and the electrode 22 to support the electrode 22.

[0090] Since the material of the tab 211 is usually relatively soft, in order to ensure that the electrode plate 22 can be stably maintained in the preset installation position after it is inserted into the through hole 12a of the electrode post 12, this embodiment adds an electrode plate bracket 23 to support the electrode plate 22, so that the electrode plate 22 can be kept relatively fixed with the winding core 21, ensuring that the electrode plate 22 can be stably in the preset installation position, improving the positional accuracy of the electrode plate 22, and facilitating the conductive connection operation between the electrode plate 22 and the electrode post 12.

[0091] In this embodiment, at least a portion of the electrode plate support 23 passes through the through hole 12a from the receiving space, specifically:

[0092] In some embodiments, the electrode holder 23 has a protruding structure 23a that protrudes away from the core 21. The protruding structure 23a extends along the length of the core 21, and the electrode 22 is supported on the protruding structure 23a. At least a portion of the protruding structure 23a passes through the receiving space into the through hole 12a. Thus, the protruding structure 23a provides support for the electrode 22, ensuring the positional accuracy of the electrode 22.

[0093] In some other embodiments, the pole post 12 has a mounting groove on the surface facing the core 21. The mounting groove extends along the length of the core 21 and penetrates the surface of the pole post 12 facing the core 21. The pole plate bracket 23 is partially embedded in the mounting groove.

[0094] Thus, in this embodiment, the electrode support 23 no longer has a protruding structure 23a. The surface of the electrode support 23 facing the electrode post 12 is flat, and the surface of the electrode support 23 facing the electrode post 12 provides support for the electrode 22. The inner wall of the housing 11 can be provided with a corresponding clearance portion. Except for the part of the electrode support 23 embedded in the mounting groove, the other parts are located inside the clearance portion. In this way, the electrode support 23 does not need to occupy a separate height space, thereby improving the utilization rate of the height space of the battery cell.

[0095] Please combine Figure 4 It is understood that when the tabs 211 are formed, the tabs with the same polarity will move towards the same place from both ends in the width direction. In this way, along the direction close to the tabs 211, the number of tabs stacked together gradually increases, so that the end face of the core 21 close to the pole post 12 has a certain slope.

[0096] Therefore, in order to ensure that the electrode plate support 23 can be stably supported on the core 21, such as Figure 4 As shown, in this embodiment, the surface of the electrode support 23 facing the core 21 is provided with a rib 231, the rib 231 abuts against the end face of the core 21 near the pole post 12, and the surface of the electrode support 23 facing away from the core 21 supports the electrode 22.

[0097] Thus, the rib 231 forms a support surface facing the core 21. The shape of the support surface can be designed to mimic the shape of the end face of the core 21 near the pole post 12, ensuring that the pole plate bracket 23 can be stably supported on the core 21 and that the position of the pole plate 22 is controllable.

[0098] In embodiments where the electrode support 23 does not have a protruding structure 23a, the electrode support 23 is provided with ribs 231 along its length. The surface of the electrode support 23 facing the core 21 is supported by the core 21 through the ribs 231, thereby increasing the support area of ​​the electrode support 23 and improving the support stability of the electrode support 23.

[0099] In embodiments where the electrode support 23 has a protruding structure 23a, such as Figure 9 and Figure 10 As shown, a recessed portion can be formed inside the protruding structure 23a, and the protruding rib 231 is set inside the recessed portion. The other areas of the electrode support 23, except for the protruding structure 23a, can be directly supported on the end face of the core 21 near the electrode post 12, reducing the space occupied by the electrode support 23 in the height direction and improving the height space utilization rate of the cell. At the same time, the protruding rib 231 set inside the recessed portion can also improve the structural strength of the protruding structure 23a, ensure the structural stability of the protruding structure 23a, and ensure the support stability of the electrode support 23 on the electrode 22.

[0100] Please continue to refer to the following: Figure 9 and Figure 10 As shown, in this embodiment, the rib 231 includes:

[0101] The first rib 2311 extends along the length of the core 21 and abuts at the root of the tab 211.

[0102] The second rib 2312 extends along the width direction of the core 21, and the surface of the second rib 2312 facing the core 21 is designed according to the root shape of the tab 211.

[0103] Thus, both the first rib 2311 and the second rib 2312 can maintain contact with the end face of the core 21 near the pole post 12, improving the support stability of the pole plate bracket 23. At the same time, in this embodiment, there are multiple second ribs 2312, which are distributed at intervals along the length direction of the core 21. The first rib 2311 connects the multiple second ribs 2312 into one, which can also improve the structural strength of the rib 231 and ensure that the pole plate bracket 23 stably plays a supporting role for the pole plate 22.

[0104] Of course, provided that the support stability of the electrode plate support 23 is guaranteed, it is also feasible for the rib 231 to include either the first rib 2311 or the second rib 2312. At the same time, there is no limit to the number of the first rib 2311 and the second rib 2312. Provided that the support stability of the electrode plate support 23 is guaranteed, the number of the first rib 2311 can be at least one, and the number of the second rib 2312 can be at least one.

[0105] In practice, the electrode plate support 23 can be made of insulating materials, such as plastic.

[0106] In this embodiment, there are two electrode plate supports 23, which are used to support the positive electrode plate 22A and the negative electrode plate 22B respectively. In practice, it is also feasible to have only one electrode plate support 23, which can support both the positive electrode plate 22A and the negative electrode plate 22B at the same time.

[0107] Please refer to Figure 4 and Figure 11 , Figure 11 This is a partial cross-sectional view of a third specific embodiment of the battery cell provided in this application.

[0108] In this embodiment, the tab 211 has a bent portion 2111, and the electrode plate 22 is connected to the bent portion 2111.

[0109] like Figure 4 As shown, in this embodiment, the bent portion 2111 is attached between the electrode plate support 23 and the electrode plate 22. Thus, the electrode plate support 23 can indirectly support the electrode plate 22 by supporting the bent portion 2111.

[0110] As can be seen, in this embodiment, the electrode plate 22 is connected to the surface of the bent portion 2111 facing away from the core 21. The outer surface area of ​​the electrode plate 22 is relatively large. Therefore, the outer surface of the electrode plate 22 can form a connection surface for external conductive connection, used to connect with the external aluminum sheet. In order to ensure the reliable connection between the electrode plate 22 and the external aluminum sheet, the outer surface of the electrode plate 22 can protrude from the outer surface of the pole post 12, so that the outer surface of the electrode plate 22 is far away from the connection point between the electrode plate 22 and the pole post 12, ensuring that the weld line height after welding is not higher than the outer surface of the electrode plate 22, ensuring the flatness of the outer surface of the electrode plate 22, and thus ensuring the reliable connection between the electrode plate 22 and the external aluminum sheet.

[0111] like Figure 11 As shown, in this embodiment, the bent portion 2111 is attached to the surface of the electrode plate 22 facing away from the electrode plate support 23. In this way, the wall portion of the electrode plate 22 facing the core 21 can be directly supported by the electrode plate support 23.

[0112] Specifically, the electrode plate 22 includes a first electrode plate portion 221, which is located on the side of the tab 211 facing the core 21. The first electrode plate portion 221 and the surface of the tab 211 facing the core 21 are connected as one unit. The electrode plate 22 also includes a second electrode plate portion 222, which is connected to the first electrode plate portion 221 and extends in a direction away from the core 21. The second electrode plate portion 222 is connected to the pole post 12.

[0113] Thus, in this embodiment, the first electrode plate 221 serves as a conductive connection with the tab 211, and the second electrode plate 222 serves as a conductive connection with the post 12, thereby achieving a conductive connection between the tab 211 and the post 12.

[0114] In this embodiment, a portion of the electrode plate 22 is located on the side of the tab 211 facing the core 21, and the second electrode plate portion 222 extends to the side of the tab 211 away from the core 21. The outer surface area of ​​the second electrode plate portion 222 is small. In order to improve the current carrying capacity of the battery cell, the outer surface of the electrode post 12 forms a connection surface for external conductive connection, which is used to connect with the external aluminum sheet.

[0115] To ensure a reliable connection between the electrode post 12 and the outer aluminum sheet, the outer surface of the electrode plate 22 is recessed into the outer surface of the electrode post 12. In this way, the weld line after welding is located inside the recessed structure, ensuring that the height of the weld line after welding is not higher than the outer surface of the electrode post 12, ensuring the flatness of the outer surface of the electrode post 12, and thus ensuring a reliable connection between the electrode post 12 and the outer aluminum sheet.

[0116] Please continue to refer to this. Figures 11-12 , Figure 12 This is a partial cross-sectional view of the fourth specific embodiment of the battery cell provided in this application.

[0117] exist Figure 11 In the illustrated embodiment, the bent portion 2111 extends along the width direction of the core 21, that is, the connecting surface between the tab 211 and the electrode plate 22 is parallel to the cross-section of the core 21; Figure 12 In the embodiment shown, there is an angle between the bent portion 2111 and the width direction of the core 21, that is, there is an angle between the connecting surface of the tab 211 and the electrode plate 22 and the cross-section of the core 21.

[0118] As set above, when there is an angle between the bending part 2111 and the width direction of the core 21, the laser beam during welding can be incident at an angle, resulting in better welding effect and improved welding reliability of the tab 211 and the electrode plate 22, making it a more preferred technical solution.

[0119] In order to ensure that the electrode plate support 23 can stably play its supporting role, at least one of the electrode tab 211 and electrode plate 22 can be bonded or snapped to the electrode plate support 23 to ensure the relative fixed state of the electrode plate support 23, electrode tab 211 and electrode plate 22, and to ensure the positional constraint of the electrode plate support 23 on the electrode plate 22.

[0120] In practice, before the tab 211 is bent, it is in a straight extension state. At this time, the electrode plate 22 and the tab 211 are welded together. Then, at least one of the tab 211 and the electrode plate 22 is fixed to the electrode plate support 23 to ensure that the three are in a relatively fixed state. Finally, the tab 211 is bent to obtain the bending state as shown above. The core 21 is bent towards the side closer to the electrode plate support 23, so that the electrode plate support 23 is supported by the core 21.

[0121] In practice, the electrode plate support 23 can be made of insulating materials, such as plastic.

[0122] Please continue to refer to this. Figure 3 and Figure 4 , Figures 13-16 , Figure 13 for Figure 1 A schematic diagram of the core assembly in a battery cell; Figure 14 for Figure 13 A magnified view of a portion of the core in the core assembly; Figure 15 for Figure 13 A schematic diagram of the first angle of the core support in the core assembly; Figure 16 for Figure 13 A schematic diagram of the second angle of the core support in the core assembly.

[0123] In this embodiment, the battery cell also includes:

[0124] The core support 24 includes a tab baffle 241, which is pressed onto the surface of the root of the tab 211 facing the pole post 12 and is located between the shell wall 111 of the housing 11, which is provided with the pole post hole 11a, and the tab 211.

[0125] It can be seen that the tab 211 has a bent portion 2111. During the bending process of the tab 211, the side of the root of the tab 211 facing away from the bent portion 2111 will inevitably arch upwards, resulting in a greater slope. Figure 14 The dotted line shows the tilted state of the root of the tab 211 after bending, on the side facing away from the bending part 2111. It can be seen that the root of the tab 211 on the side facing away from the bending part 2111 occupies a certain height space, resulting in a loss of cell height space utilization.

[0126] In this embodiment, a core support 24 is added, such as Figure 3 and Figure 4As shown, the core support 24 is provided with a tab baffle 241. The tab baffle 241 is pressed onto the surface of the root of the tab 211 facing the pole post 12. In this way, the tab baffle 241 will exert a certain downward pressure on the upward arched part of the root of the tab 211, making the side of the root of the tab 211 away from the bending part 2111 more compact in the height direction, reducing the height space occupied by the root of the tab 211 and improving the utilization rate of the cell height space.

[0127] Please continue to refer to this. Figure 15 and Figure 16 In this embodiment, the core support 24 also includes a core support body 242. The core support body 242 is provided with a clearance hole 24a. There are two electrode tab baffles 241. The electrode tab baffles 241 are disposed inside the clearance hole 24a and distributed along the width direction of the clearance hole 24a. The electrode tab 211 and the electrode plate 22 can pass through the clearance hole 24a and the position between the two electrode tab baffles 241.

[0128] Combination Figure 3 As can be seen, without the aforementioned tab baffle 241, the upward arching of the root of the tab 211 facing away from the bending portion 2111 would interfere with the pole post 12, affecting the positioning and installation of the pole plate 22 and the pole post 12. In this embodiment, the tab baffle 241 is added to constrain the shape of the root of the tab 211 facing away from the bending portion 2111, ensuring that when the core assembly is inserted into the shell, the pole plate 22 and the tab 211 can smoothly enter the inner cavity of the pole post 12, ensuring reliable positioning of the pole plate 22 and the pole post 12.

[0129] Depend on Figure 3 As can be seen, in this embodiment, the free end of the tab baffle 241 extends to a position close to the tab 211, and the inner end of the pole post 12 and the tab baffle 241 abut against the wall of the core 21, thereby isolating the tab 211 and the housing 11 to avoid short circuit problems.

[0130] Depend on Figure 4 As can be seen, in this embodiment, the free end of the tab baffle 241 extends into the interior of the pole hole 11a, thereby isolating the tab 211 and the housing 11 to avoid short circuit problems.

[0131] Combination Figure 4 In this embodiment, there are two cores 21 and two tabs 211. The two tabs 211 are mirror images of each other. Therefore, in this embodiment, two tab baffles 241 are connected inside the clearance hole 24a. The two tab baffles 241 are arranged along the width direction of the clearance hole 24a. Each tab baffle 241 presses the root of the corresponding tab 211 on the side facing away from the bending portion 2111, thereby constraining the shape of the root of the tab 211.

[0132] In practice, when there is only one core 21 and one tab 211, only one tab baffle 241 can be installed inside the clearance hole 24a.

[0133] Furthermore, the core support 24 is installed at the end of the core 21 facing the pole post 12. Specifically, in this embodiment, as follows: Figure 9 As shown, the electrode plate bracket 23 is provided with positioning posts 232, such as Figure 15 As shown, the core support 24 is provided with a positioning hole 24b, and the positioning post 232 is inserted into the positioning hole 24b to realize the positioning of the core support 24 and ensure the assembly accuracy of the core support 24.

[0134] Depend on Figure 9 As can be seen, in this embodiment, the aforementioned positioning posts 232 are provided at both ends of the electrode plate support 23 along its length. Figure 15 It can be seen that the core support 24 is provided with positioning holes 24b at both ends of the clearance hole 24a. The core support 24 and the electrode plate support 23 are positioned by the insertion and cooperation of four sets of positioning pins 232 and positioning holes 24b.

[0135] In practice, the core support 24 and the electrode plate support 23 can be positioned by the insertion and engagement of at least two sets of positioning pins 232 and positioning holes 24b.

[0136] Of course, in practice, it is also feasible to have a positioning hole 24b on the electrode plate bracket 23 and a corresponding positioning post 232 on the core bracket 24. In addition, in practice, the core bracket 24 and the electrode plate bracket 23 are not limited to the insertion fit of the positioning post 232 and the positioning hole 24b, such as a snap fit to achieve positioning is also feasible.

[0137] Please refer to Figures 17-20 , Figure 17 for Figure 1 A breakdown diagram of the battery cell; Figure 18 for Figure 16 Partial diagram of the middle shell; Figure 19 This is a breakdown diagram of the fifth specific embodiment of the battery cell provided in this application; Figure 20 This is a breakdown diagram of the sixth specific embodiment of the battery cell provided in this application.

[0138] In this embodiment, the housing 11 includes a housing body 11A and a cover plate 11B. The interior of the housing body 11A is hollow, and one end of the housing body 11A is an open end. The cover plate 11B is connected to the open end of the housing body 11A. The housing body 11A and the cover plate 11B enclose and form an accommodating space. The pole post 12 is disposed through the cover plate 11B, or the pole post 12 is disposed through the bottom wall 11A1 of the housing body 11A.

[0139] It should be noted that the end wall opposite the opening end in the shell body 11A is defined here as the bottom wall 11A1.

[0140] In practice, the shell body 11A is usually a one-piece molded part formed by stretching. The closed end of the shell body 11A will have a rounded corner. In other words, the bottom wall 11A1 of the shell body 11A is connected to the side wall with a rounded corner. However, the core 21 cannot be machined with a matching rounded corner. Therefore, when the pole post 12 is set on the cover plate 11B, in order to make the core assembly avoid the rounded corner at the bottom of the shell body 11A, a support component needs to be added inside the shell 11. The support component is used to raise the core assembly to avoid the rounded corner at the closed end of the shell body 11A. The existence of the support component will lose some of the cell height space and reduce the utilization rate of the cell height space.

[0141] Based on this, in some other embodiments of this application, the pole post 12 is disposed on the bottom wall 11A1 of the shell body 11A, the cover plate 11B and the shell body 11A are connected at right angles, and the core assembly can be directly supported on the cover plate 11B without the need for support components to raise it, thereby further improving the utilization rate of the cell height space, reducing the number of parts in the cell, reducing costs, reducing the weight of the cell, and meeting the requirements for lightweighting.

[0142] Furthermore, since the pole post 12 is located at the end of the housing body 11A away from the cover plate 11B, the amplitude at the connection between the housing body 11A and the cover plate 11B is smaller, and the connection between the housing body 11A and the cover plate 11B is less prone to cracking, which can improve the reliability of the battery cell, help reduce the wall thickness of the housing body 11A, thereby further reducing costs, lightening the weight of the battery cell, and realizing the miniaturization of the housing body 11A.

[0143] Furthermore, in this embodiment, the battery cell also includes an explosion-proof valve 16, which is used to release the internal gas pressure to the outside when thermal runaway occurs inside the battery, thereby preventing the battery from exploding and improving the battery's safety performance.

[0144] In practice, the explosion-proof valve 16 and the pole post 12 can be installed on the same side wall of the housing 11 or on different side walls of the housing 11.

[0145] When the explosion-proof valve 16 and the pole post 12 are located on different side walls of the housing 11, the pole post 12 has a larger arrangement space, the cross-sectional area of ​​the pole post 12 can be increased, thereby increasing the area of ​​the connection surface formed by the pole post 12 for external conductive connection, improving the overcurrent capacity of the battery cell, and meeting the fast charging design requirements.

[0146] Please continue to refer to this. Figure 20In addition to the aforementioned square cell design, the battery cell in this embodiment can also be applied to the design scheme of blade structure battery cell. Specifically, the terminal 12 includes a positive terminal 12A and a negative terminal 12B. The housing 11 includes a housing body 11A and a cover plate 11B. The interior of the housing body 11A is hollow, and both ends of the length direction of the housing body 11A are open ends. The housing body 11A has a square tube structure. The cover plate 11B is connected to the open ends of the housing body 11A. The core 5 is located inside the housing body 11A. The positive terminal 12A and the negative terminal 12B are respectively disposed on the two cover plates 11B.

[0147] This embodiment also provides a battery pack, including the aforementioned battery cells.

[0148] The battery pack of this embodiment includes the aforementioned battery cell, and therefore has the same technical effects as the aforementioned battery cell, which will not be described again here.

[0149] This embodiment also provides a vehicle including the aforementioned battery pack.

[0150] The vehicle in this embodiment includes the aforementioned battery pack, and therefore has the same technical effects as the aforementioned battery pack, which will not be repeated here.

[0151] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A battery cell, characterized in that, include: The housing (11) has an internal accommodating space; The pole post (12) is mounted on the housing (11) from the outside of the housing (11). The pole post (12) has a through hole (12a). The hole axis of the through hole (12a) is arranged along the height direction of the pole post (12). The through hole (12a) communicates with the receiving space. The electrode plate (22), at least a portion of which extends through the receiving space into the through hole (12a) and is electrically connected to the electrode post (12); The core (21) is disposed in the receiving space, and at least a portion of the tabs (211) of the core (21) pass through the receiving space into the through hole (12a) and are electrically connected to the electrode plate (22).

2. The battery cell according to claim 1, characterized in that, The battery cell also includes an upper plastic layer (13); The housing (11) is provided with a pole hole (11a), the pole (12) has a snap-fit ​​part, the pole (12) is fixed to the upper plastic (13) through the snap-fit ​​part, and the orthographic projection of the through hole (12a) toward the housing (11) is located inside the outline of the pole hole (11a).

3. The battery cell according to claim 2, characterized in that, The pole post (12) passes through the pole post hole (11a). The locking part includes a first locking part (121) and a second locking part (122) located at both ends of the pole post (12) along the height direction. The first locking part (121) is located outside the housing (11) and the size of the first locking part (121) is larger than the size of the pole post hole (11a). The second locking part (122) is located inside the housing (11) and the size of the second locking part (122) is smaller than the size of the pole post hole (11a). The upper plastic (13) includes a first groove and a first protrusion. The first groove covers at least a portion of the shell wall (111) of the shell (11) which is provided with the pole hole (11a). The first protrusion engages with the snap-fit ​​part.

4. The battery cell according to claim 2, characterized in that, The pole post (12) is located outside the housing (11). The snap-fit ​​part includes a third snap-fit ​​part (123) located at one end of the pole post (12) near the core (21). The upper plastic (13) has a fixing part and a second groove. The fixing part is fixed to the housing (11), and the second groove engages with the third snap-fit ​​part (123).

5. The battery cell according to claim 4, characterized in that, It also includes a retaining ring (14) that connects to the housing (11); The fixing part includes a third groove, which partially encloses the retaining ring (14).

6. The battery cell according to any one of claims 2-5, characterized in that, The shell (11) is provided with the pole hole (11a) and the shell wall (111) and the pole (12) are sealed together.

7. The battery cell according to claim 4, characterized in that, The housing (11) is provided with a recessed platform (11b), the pole hole (11a) is located in the recessed platform (11b), and the orthographic projection of the pole (12) toward the housing (11) is located in the recessed platform (11b).

8. The battery cell according to any one of claims 1-5, characterized in that, Also includes: The electrode support (23) is located between the end face of the core (21) near the pole post (12) and the electrode (22) to support the electrode (22).

9. The battery cell according to claim 8, characterized in that, At least a portion of the electrode support (23) extends through the receiving space into the through hole (12a).

10. The battery cell according to claim 9, characterized in that, The electrode support (23) has a protruding structure (23a) that protrudes away from the core (21), the protruding structure (23a) extending along the length of the core (21), the electrode (22) being supported on the protruding structure (23a), and at least a portion of the protruding structure (23a) passing through the receiving space into the through hole (12a).

11. The battery cell according to claim 9, characterized in that, The pole post (12) has an installation groove on its surface facing the core (21). The installation groove extends along the length of the core (21) and penetrates the surface of the pole post (12) facing the core (21). The pole plate bracket (23) is partially embedded in the installation groove.

12. The battery cell according to claim 8, characterized in that, The electrode plate support (23) has a raised rib (231) on the surface facing the core (21), the raised rib (231) abuts against the end face of the core (21) near the pole post (12), and the electrode plate support (23) supports the electrode plate (22) on the surface facing away from the core (21).

13. The battery cell according to any one of claims 2-5, characterized in that, The battery cell also includes: The core support (24) includes a tab baffle (241), which is pressed onto the surface of the root of the tab (211) facing the pole post (12) and is located between the shell wall (111) of the housing (11) where the pole post hole (11a) is provided and the tab (211).

14. The battery cell according to any one of claims 1-5, characterized in that, The housing (11) includes a housing body (11A) and a cover plate (11B), the housing body (11A) and the cover plate (11B) enclose the receiving space, and the pole post (12) is installed on the bottom wall (11A1) of the housing body (11A).

15. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1-14.

16. A vehicle, characterized in that, Includes the battery pack as described in claim 15.

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