Battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell which comprises a cover plate, a pole and a connecting component, the pole is mounted on the cover plate, a mounting groove and a mounting through hole which are sequentially communicated along a first preset direction are formed in the pole, the mounting groove penetrates through the inner side of the pole, and the mounting through hole penetrates through the outer side of the pole; the connecting component comprises a first connecting part, a second connecting part and a mounting convex part which are connected in sequence, and the first connecting part is positioned on the inner side, close to the pole group, of the cover plate and is used for connecting a tab cluster of the pole group; the second connecting part is installed in the installation groove, the installation protruding part is installed in the installation through hole, and a welding area located on the outer side of the installation protruding part is formed on the second connecting part in the first preset direction. According to the battery cell provided by the invention, by redesigning the structures of the connecting pieces and the pole columns, whether the connecting pieces and the pole columns are installed in place or not can be conveniently observed, meanwhile, welding operation is facilitated, the requirement for workers is lower, and welding spatter cannot fall into the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell. Background Technology

[0002] Currently, batteries consist of electrode packs, connecting tabs, and cover plate assemblies. The connecting tabs are welded to the tab clusters connecting the electrode packs and the terminals on the cover plate assembly. Currently, some terminals and connecting tabs use two assembly structures: First, a blind hole is made in the terminal, and the upper structure of the connecting tab is inserted into the blind hole and welded to the terminal by through-welding. Because it's a blind hole, it's impossible to observe whether the connecting tab is properly inserted from the outside of the cover plate, i.e., the outside of the terminal, which may lead to problems such as cold solder joints. Second, a through hole is made in the terminal, and the upper structure of the connecting tab is inserted into the through hole. Although this allows observation of whether it's properly inserted, welding is difficult and prone to cold solder joints, and welding spatter can easily fall into the through hole. Clearly, both assembly structures have significant problems. Therefore, there is a need to develop a new assembly structure for connecting tabs and terminals that facilitates observation of proper installation, simplifies welding operations, and reduces the likelihood of cold solder joints. Utility Model Content

[0003] The purpose of this application is to provide a battery cell that, to a certain extent, solves the technical problem in the existing technology that currently requires the development of a new type of assembly structure for connecting pieces and terminals, which facilitates the observation of whether the installation is in place, facilitates welding operations, and is less prone to problems such as poor soldering.

[0004] This application provides a battery cell, including: a cover plate, a terminal post, and a connecting member; wherein, the terminal post is mounted on the cover plate, and the terminal post forms a mounting groove and a mounting through hole that are sequentially arranged and connected along a first preset direction, and the mounting groove penetrates the inner side of the terminal post near the electrode group, and the mounting through hole penetrates the outer side of the terminal post away from the electrode group.

[0005] The connecting member includes a first connecting portion, a second connecting portion, and a mounting protrusion connected sequentially. Along the first preset direction, the mounting protrusion is located on the outer side of the second connecting portion away from the electrode group. The first connecting portion is located on the inner side of the cover plate near the electrode group and is used to connect the electrode lugs of the electrode group. The second connecting portion is installed in the mounting groove, and the mounting protrusion is installed in the mounting through hole. Along the first preset direction, the second connecting portion forms a welding area located on the outer side of the projection of the mounting protrusion.

[0006] In the above technical solution, the second connecting part further includes a plug-in part and a welding part connected together; wherein, along a second preset direction perpendicular to the first preset direction, the welding part is disposed on the side of the plug-in part; along the first preset direction, the mounting protrusion is disposed at the end of the welding part away from the electrode group.

[0007] In any of the above technical solutions, further, along a third preset direction perpendicular to the first preset direction, at least one side of the plug portion is formed with an auxiliary heat dissipation portion that extends beyond the welding portion.

[0008] In any of the above technical solutions, the plug-in portion and the first connecting portion are further combined to form an L-shaped plate structure.

[0009] In any of the above technical solutions, the number of pole groups is two, the number of first connecting parts and plug-in parts is also two, and they correspond one-to-one with the two pole groups. Furthermore, along the second preset direction, the two plug-in parts and the two first connecting parts are symmetrically arranged on opposite sides of the welding part.

[0010] In any of the above technical solutions, the welding part and the insertion part are further combined into a cuboid structure or a cube structure.

[0011] In any of the above technical solutions, the mounting protrusion is further defined as a cuboid or a cube.

[0012] In any of the above technical solutions, the plug-in portion is further arranged along the first preset direction.

[0013] In any of the above technical solutions, the mounting protrusion, the welding part, the plug-in part, and the first connecting part are further integrated into a single structure.

[0014] In any of the above technical solutions, further, along the first preset direction, a welding thinning area is formed on the side of the pole away from the pole group, located on the outer periphery of the mounting through hole, and is disposed corresponding to the welding area along the first preset direction.

[0015] In any of the above technical solutions, further, along the first preset direction, the depth of the welding thinning zone is L1, and 0.5mm. <L1<0.7mm。

[0016] In any of the above technical solutions, further, along a direction perpendicular to the first preset direction, the width of the welding thinning zone is L0, and 2mm. <L0<3mm。

[0017] In any of the above technical solutions, further, along the direction perpendicular to the first preset direction, the width of the welding thinning area is L0, along the first preset direction, the projection of the mounting protrusion falls into the projection of the second connecting part, and the gap between the two projections along the second preset direction perpendicular to the first preset direction is L2, the gap between the two projections along the third preset direction perpendicular to the first preset direction is L3, and L2>L0, L3>L0.

[0018] In any of the above technical solutions, the welding thinning zone and the welding zone are further defined as matching annular regions.

[0019] In any of the above technical solutions, further, along the first preset direction, the mounting protrusion does not protrude from the pole post, and the height difference between the two is S, where 0.1mm < S < 0.2mm.

[0020] In any of the above technical solutions, further, along the first preset direction, the height of the mounting protrusion is h, and 0.6mm < h < 1.2mm.

[0021] In any of the above technical solutions, further, along the first preset direction, the depth of the mounting groove is H, and 4mm. <H<5mm。

[0022] In any of the above technical solutions, the mounting through hole is adapted to the mounting protrusion, and the mounting groove is adapted to the second connecting part.

[0023] In any of the above technical solutions, the battery cell further includes a lower plastic, an upper plastic, a welding ring, and a sealing ring; wherein, the cover plate has a first through hole extending through both sides along the first preset direction, the electrode post is installed in the first through hole, and the sealing ring is compressed between the outer wall of the electrode post and the wall of the first through hole; the lower plastic is disposed on the inner side of the cover plate near the electrode assembly, and along the first preset direction, the lower plastic has a second through hole corresponding to the first through hole; the welding ring is sleeved on the outside of the electrode post and connected to the electrode post by welding; the upper plastic is wrapped around the outside of the welding ring by injection molding.

[0024] Compared with the prior art, the beneficial effects of this application are as follows:

[0025] In the battery cell provided in this application, the structure of the connecting piece and the terminal post is redesigned. An installation protrusion is provided on the connecting member, which can be installed in the mounting through hole of the terminal post. Since the structure is exposed, it is easy to observe whether the assembly is in place. Moreover, a welding area is provided on the side of the connecting member below the installation protrusion. This allows for through welding of the terminal post structure and welding area located outside the installation protrusion. The operation is simple and convenient, with low personnel requirements. In other words, it helps to improve the fault tolerance rate and prevents the occurrence of incomplete welding and welding spatter falling into the through hole, which greatly improves the welding quality. In addition, by directly inserting part of the connecting member structure into the mounting groove and mounting through hole of the terminal post, space is greatly saved, effectively reducing the space occupied by the connecting piece inside the battery, thereby improving space utilization. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A partial structural diagram of the battery cell provided in an embodiment of this application;

[0028] Figure 2 for Figure 1 A magnified structural diagram at point A;

[0029] Figure 3 This is another partial structural diagram of the battery cell provided in an embodiment of this application;

[0030] Figure 4 for Figure 3 A sectional view along section BB;

[0031] Figure 5 for Figure 4 A magnified structural diagram at point C;

[0032] Figure 6 This is a schematic diagram of the pole structure provided in an embodiment of this application;

[0033] Figure 7 This is another structural schematic diagram of the pole provided in an embodiment of this application;

[0034] Figure 8 Another structural schematic diagram of the pole provided in the embodiments of this application;

[0035] Figure 9This is a schematic diagram of the structure of the connecting member provided in the embodiments of this application;

[0036] Figure 10 This is another structural schematic diagram of the connecting member provided in an embodiment of this application;

[0037] Figure 11 Another structural schematic diagram of the connecting member provided in the embodiments of this application;

[0038] Figure 12 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of this application;

[0039] Figure 13 Another structural schematic diagram of the pole provided in the embodiments of this application;

[0040] Figure 14 This is another structural schematic diagram of the pole provided in an embodiment of this application.

[0041] Figure label:

[0042] 1-Cover plate, 2-Pole post, 21-Mounting groove, 22-Mounting through hole, 23-Welding thinning area, 24-Stop step, 3-Connecting component, 31-First connecting part, 32-Second connecting part, 321-Plug-in part, 322-Welding part, 3221-Welding area, 323-Auxiliary heat dissipation part, 33-Mounting protrusion, 4-Pole group, 41-Pole lug cluster, 5-Lower plastic, 6-Sealing ring, 7-Compression insulation structure. Detailed Implementation

[0043] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0044] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0045] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] The following reference Figures 1 to 14 This application describes a battery cell according to some embodiments.

[0049] See Figures 1 to 12 As shown, an embodiment of this application provides a battery cell, including: a cover plate 1, a terminal post 2, and a connecting member 3; wherein, the terminal post 2 is mounted on the cover plate 1, and the terminal post 2 has a mounting groove 21 and a mounting through hole 22 that are sequentially connected along a first preset direction a1, and the mounting groove 21 penetrates the inner side of the terminal post 2 near the electrode group 4, and the mounting through hole 22 penetrates the outer side of the terminal post 2 away from the electrode group 4, that is, a stop step 24 is formed between the mounting through hole 22 and the mounting groove 21;

[0050] The connecting member 3 includes a first connecting part 31, a second connecting part 32, and a mounting protrusion 33 connected sequentially. Along the first preset direction a1, the mounting protrusion 33 is located on the outer side of the second connecting part 32 away from the electrode group 4. The first connecting part 31 is located on the inner side of the cover plate 1 near the electrode group 4 and is used to connect the electrode lugs of the electrode group 4. The second connecting part 32 is installed in the mounting groove 21. The stop step 24 mentioned above can limit the second connecting part 32. The mounting protrusion 33 is installed in the mounting through hole 22. Along the first preset direction a1, the second connecting part 32 forms a welding area 3221 located on the outer side of the projection of the mounting protrusion 33.

[0051] As can be seen from the structure described above, in the battery cell provided by this application, by redesigning the structure of the connecting piece and the terminal 2, a mounting protrusion 33 is provided on the connecting member 3. The mounting protrusion 33 can be installed in the mounting through hole 22 of the terminal 2. Since the structure is exposed, it is easy to observe whether the assembly is in place. Moreover, a welding area 3221 is provided on the side of the connecting member 3 below the mounting protrusion 33. In this way, the terminal structure located outside the mounting protrusion 33 and the welding area 3221 can be penetrated and welded. The operation is simple and convenient, and the requirements for personnel are low. In other words, it helps to improve the fault tolerance rate and will not cause the occurrence of false welding or welding spatter falling into the through hole, which greatly improves the welding quality. In addition, by directly inserting part of the structure of the connecting member 3 into the mounting groove 21 and mounting through hole 22 of the terminal 2, space is greatly saved and the space occupied by the connecting piece inside the battery is effectively reduced, thereby improving the space utilization rate.

[0052] Furthermore, preferably, the first preset direction a1 can be the thickness direction of the cover plate 1, or it can be understood as the height direction of the pole group 4, but it is not limited to this.

[0053] Furthermore, preferably, the cover plate 1 has a first through hole extending through both sides along the first preset direction a1, and the pole post 2 is installed in the first through hole.

[0054] In this embodiment, preferably, as follows: Figure 5 , Figures 9 to 11 As shown, the second connecting part 32 includes a plug-in part 321 and a welding part 322 connected to each other; wherein, along a second preset direction a2 perpendicular to the first preset direction a1, the welding part 322 is disposed on the side of the plug-in part 321; along the first preset direction a1, a mounting protrusion 33 is disposed at one end of the welding part 322 away from the electrode group 4.

[0055] As can be seen from the structure described above, the welding part 322 mainly serves to penetrate and weld with the pole post structure on the outside of the mounting protrusion 33; the plug-in part 321 serves to connect the first connecting part 31, support the welding part 322, and cooperate with the pole post 2.

[0056] Furthermore, preferably, the second preset direction a2 is the width direction of the cover plate 1, which can also be understood as the width direction or the thickness direction of the pole group 4, but of course, it is not limited to this.

[0057] Furthermore, preferably, the insertion part 321 is arranged along the first preset direction a1, which facilitates insertion into the mounting groove 21 arranged along the first preset direction a1.

[0058] In this embodiment, preferably, as follows: Figure 9 and Figure 10As shown, along a third preset direction a3 perpendicular to the first preset direction a1, auxiliary heat dissipation portions 323 extending beyond the welding portion 322 are formed on both sides of the insertion portion 321.

[0059] As can be seen from the structure described above, the auxiliary heat dissipation parts 323 extending from both ends of the plug-in part 321 increase the heat dissipation area, improve the heat dissipation effect, and help improve the performance of the battery.

[0060] Furthermore, preferably, the third preset direction a3 is the length direction of the cover plate 1, which can also be understood as the length direction of the pole group 4. Any two of the first preset direction a1, the second preset direction a2, and the third preset direction a3 are set perpendicularly, but of course, it is not limited to this. It should be noted that the length direction of the pole tab cluster 41 of the pole group 4 is the same as the length direction of the cover plate 1, and the width direction of the pole tab cluster 41 is the same as the width direction of the cover plate 1.

[0061] It should be noted that the structure is not limited to the above-mentioned structure in which auxiliary heat dissipation parts 323 are provided on both sides of the plug-in part 321. It is also possible to provide auxiliary heat dissipation parts 323 only on one side of the plug-in part 321. Furthermore, it is not limited to providing heat dissipation protrusions in the third preset direction a3. Auxiliary heat dissipation parts 323 can also be provided in other directions. It should also be noted that the auxiliary heat dissipation parts 323 may not be provided. The specific choice depends on the actual needs.

[0062] In this embodiment, preferably, as follows: Figure 5 and Figure 9 As shown, the plug-in portion 321 and the first connecting portion 31 are combined to form an L-shaped plate structure, and preferably, the bend of the L-shaped plate structure is arc-shaped to avoid sharp corners.

[0063] As can be seen from the structure described above, the plug-in part 321 and the first connecting part 31 are combined to form a simple L-shaped structure. The first connecting part 31 is set parallel to the cover plate 1, which facilitates the mating of the flattened electrode cluster and helps to save space and improve space utilization. The plug-in part 321 is preferably set along the first preset direction a1, which facilitates insertion into the mounting groove 21. It should be noted that the plug-in part 321 is not limited to being set along the first preset direction a1. It can also be set at an angle to the first preset direction a1.

[0064] Furthermore, preferably, the first connecting part 31 is a rectangular plate and the plug-in part 321 is a rectangular plate. Of course, the shapes of the first connecting part 31 and the second connecting part 32 are not limited to the above, and can be designed according to actual needs.

[0065] In this embodiment, preferably, as follows: Figure 11As shown, along the first preset direction a1, the height of the protrusion 33 is h, and 0.6mm < h < 1.2mm.

[0066] Based on the structure described above, the height h of the mounting protrusion 33 should be between 0.6mm and 1.2mm. This satisfies the requirements for observation and positioning while avoiding design margins that could increase material consumption. It also helps improve space utilization and prevents interference with other structures. Of course, the value of h is not limited to the above; h ≤ 0.6mm or h ≥ 1.2mm can also be chosen based on actual needs.

[0067] In this embodiment, preferably, as follows: Figure 5 As shown, along the first preset direction a1, the protrusion 33 is installed without protruding from the pole post 2, and the height difference between the two is S, and 0.1mm < S < 0.2mm.

[0068] As described above, after installation, an aluminum sheet (conductive sheet) needs to be installed on top of the pole 2, and then the pole 2 and the aluminum sheet (conductive sheet) are welded together. If S is too small, due to processing errors, the mounting protrusion 33 may protrude from the pole 2, thus lifting the aluminum sheet (conductive sheet), which is not conducive to welding. If S is too large, the depth of the mounting groove 21 will be too small, which will prevent the connecting component 3 from being properly inserted into the pole 2 during assembly. Therefore, S is set between 0.1mm and 0.2mm. Of course, the range of S is not limited to the above; S ≤ 0.1mm or S ≥ 0.2mm can also be set, depending on the actual needs.

[0069] In this embodiment, preferably, as follows: Figure 14 As shown, along the first preset direction a1, the depth of the mounting groove 21 is H, and 4mm. <H<5mm。

[0070] Based on the structure described above, if the depth H of the mounting groove 21 is too small, the connecting component 3 cannot be properly inserted into the pole post 2 during assembly. If the depth H of the mounting groove 21 is too large, the weld penetration between the pole post 2 and the connecting component 3 will be thin, resulting in lower weld strength. Therefore, the depth H of the mounting groove 21 should be within the range of 4mm-5mm. Of course, the range of H is not limited to the above; H can also be ≤4mm or ≥5mm, depending on the actual needs.

[0071] In this embodiment, preferably, as follows: Figure 5As shown, there are two pole groups 4, and the two pole groups 4 share two pole posts 2, one positive pole post and one negative pole post. Since the assembly structure of the two pole posts 2 is the same, only one is used as an example. For a single pole post 2, there are two first connecting parts 31 and two plug-in parts 321, which correspond one-to-one with the two pole groups 4. Along the second preset direction a2, the two plug-in parts 321 and the two first connecting parts 31 are symmetrically arranged on opposite sides of the welding part 322.

[0072] As can be seen from the structure described above, there are two pole groups 4 in this application. Therefore, one of the first connecting parts 31 is welded to the pole lugs of one of the pole groups 4, and the other first connecting part 31 is welded to the pole lugs of the other pole group 4. Each first connecting part 31 is equipped with a plug-in part 321, and a welding part 322 is provided between the two plug-in parts 321. It can be seen that the connection structure on both sides shares a welding part 322, which saves space and materials, greatly improves space utilization, and reduces costs.

[0073] Furthermore, preferably, the two auxiliary heat dissipation parts 323, the two plug-in parts 321 and the welding part 322 form an I-shaped structure. Correspondingly, the mounting groove 21 is also an I-shaped groove adapted to the aforementioned structure. Of course, it is not limited to this.

[0074] It should be noted that the structure is not limited to the two pole groups 4 in this application. The number of pole groups 4 can also be one or more. When there is one pole group 4, only one plug-in part 321 and one first connecting part 31 are needed for a single pole post 2. When there are more than two pole groups 4, such as three, four, five or eight, etc., for an even number of pole groups 4, every two pole groups 4 are grouped together and can be set up according to the above structure. For an odd number of pole groups 4, along the arrangement order of the pole groups 4, every two pole groups 4 are grouped together and can be set up according to the above two pole groups 4 structure. The structure of the connecting member 3 used in group 4, and the structure of the connecting piece 4 of the aforementioned single pole group 4, that is, for the single pole post 2, the connection part 321 and the first connecting part 31 provided are sufficient, or other types of connecting piece structures, etc. Of course, it is not limited to this. In the case of two pole groups 4 or more pole groups 4 in this application, the two pole groups 4 may not be divided into a group and share the welding part 322 and other structures. Each pole group 4 and the single pole post may also be provided with a separate connecting member 3, etc., so that they do not interfere with each other.

[0075] In addition, it should be noted that in this embodiment, the number of poles installed on the same cover plate is not limited to the two mentioned above, but can also be one, depending on actual needs.

[0076] In this embodiment, preferably, as follows: Figures 9 to 11 As shown, the welding part 322 and the plug-in part 321 are combined into a cuboid or cube structure with a regular shape, which facilitates processing and manufacturing as well as subsequent assembly with the pole post 2. Of course, it is not limited to this. The welding part 322 and the plug-in part 321 can also be combined into other shapes, such as cylindrical or prismatic, such as square prism, pentagonal prism or hexagonal prism, etc. Of course, it is not limited to this. Other shapes are also possible, depending on the actual needs of the design.

[0077] In this embodiment, preferably, as follows: Figures 9 to 11 As shown, the mounting protrusion 33 is a cuboid or cube, that is, it is a relatively short square block with a regular shape, which facilitates processing and manufacturing as well as subsequent assembly with the pole post 2. Of course, it is not limited to this. The mounting protrusion 33 can also adopt other shapes. For example, the mounting protrusion 33 can also be cylindrical or prismatic, such as a square prism, pentagonal prism, or hexagonal prism, etc. Of course, it is not limited to this. It can also be other structural shapes, etc., depending on the actual needs of the design.

[0078] In this embodiment, preferably, as follows: Figures 9 to 11 As shown, the mounting protrusion 33, the insertion part 321, the welding part 322, and the first connecting part 31 are an integral structure. The integral structure has high strength and eliminates the need for subsequent welding operations, simplifying the production process and improving production efficiency. Of course, it is not limited to this; other structures can also be used, such as the insertion part 321 and the welding part 322 being separate structures that can be connected by welding.

[0079] Furthermore, it should be noted that when the connecting member 3 of this application is used as a connecting structure that mates with the positive electrode post 2 and the positive electrode lug of the electrode group 4, the mounting protrusion 33, the welding part 322, the plug-in part 321, and the first connecting part 31 are all made of the same material. When the connecting member 3 of this application is used as a connecting structure that mates with the negative electrode post 2 and the negative electrode lug of the electrode group 4, the mounting protrusion 33 and the plug-in part 321 are made of the same material, the mounting protrusion 33 and the welding part 322 are made of the same material, for example, both can be copper, and the plug-in part 321 and the first connecting part 31 are made of the same material, for example, both can be aluminum. Regardless of whether the various parts of the connecting member are made of the same material, they can be rolled into an integral structure, etc.

[0080] In this embodiment, preferably, as follows: Figure 2As shown, along the first preset direction a1, a welding thinning area 23 is formed on the side of the pole post 2 away from the pole group, located on the outer periphery of the mounting through hole 22. Preferably, this welding thinning area 23 is provided in correspondence with the aforementioned welding area 3221 along the first preset direction a1.

[0081] As can be seen from the structure described above, a groove is made on the pole post 2 above the welding area 3221 of the connecting member 3. That is, a groove penetrating the side and top is made on the pole post 2 on the outer periphery of the mounting through hole. The groove is connected to the central mounting through hole. This can reduce the thickness of the pole post 2 on the outer periphery of the mounting protrusion 33, which facilitates penetration welding, improves the effect of penetration welding, and also blocks welding spatter, thus protecting other structures outside the welding area 3221.

[0082] It should be noted that the welding thinning zone 23 may not be provided, that is, the groove is not opened on the outside of the pole post 2. The specific choice depends on the actual needs.

[0083] In this embodiment, preferably, as follows: Figure 10 and Figure 13 As shown, the welding thinning zone 23 and the welding zone 3221 are matching annular regions.

[0084] As can be seen from the structure described above, the use of the annular welding thinning zone 23 and the annular welding zone 3221 results in a larger welding area, a more uniform distribution of the welding area, a stronger and more stable structure after welding, and a better welding effect.

[0085] It should be noted that the welding thinning zone 23 and the welding zone 3221 are not limited to the above-mentioned annular area, but can also be a fan-shaped annular area, that is, a part of the annular area, or other shaped areas, depending on the actual needs of the design.

[0086] In this embodiment, preferably, as follows: Figure 14 As shown, along the first preset direction a1, the depth of the weld thinning zone is L1, and 0.5mm. <L1<0.7mm。

[0087] Based on the structure described above, it is clear that if the depth of the weld thinning zone is too small, it is not conducive to welding and spatter shielding; if the depth of the weld thinning zone is too large, the pole portion below the weld thinning zone will be too thin, leading to structural instability after penetration welding. Therefore, the depth L1 of the weld thinning zone should be within the range of 0.5mm-0.7mm. Of course, the value of L1 is not limited to the above; L1 can also be ≤0.5mm or ≥0.7mm, depending on the actual needs.

[0088] In this embodiment, preferably, as follows: Figure 13As shown, along the direction perpendicular to the first preset direction a1, the width of the welding thinning zone is L0, and 2mm. <L0<3mm。

[0089] Based on the structure described above, it is clear that if the width of the weld thinning zone is too small, the weld area will be small, resulting in an unstable and unreliable post-weld structure. Conversely, if the width of the weld thinning zone is too large, it will result in a large weld area, more welding spatter, greater impact on other components, and a higher risk of interference. Therefore, the width L0 of the weld thinning zone should be within the range of 2-3 mm. Of course, the range of L0 is not limited to the above; L0 ≤ 2 mm or L0 ≥ 3 mm can also be chosen based on actual needs.

[0090] In this embodiment, preferably, as follows: Figure 10 and Figure 13 As shown, along the direction perpendicular to the first preset direction a1, the width of the welding thinning area is L0. Along the first preset direction a1, the projection of the mounting protrusion falls into the projection of the second connecting part, and the gap between the two projections along the second preset direction a2 perpendicular to the first preset direction a1, that is, the length direction of the tab cluster, is L2. The gap between the two projections along the third preset direction a3 perpendicular to the first preset direction a1, that is, the width direction of the tab cluster, is L3, and L2>L0, L3>L0.

[0091] As described above, only by ensuring L2 > L0 and L3 > L0 can the area below the weld thinning zone be completely covered by the weld zone, thus guaranteeing the weld area. Of course, this is not the only limitation; the design can be tailored to specific needs.

[0092] In this embodiment, preferably, as follows: Figure 2 , Figure 5 , Figures 6 to 11 As shown, the mounting through hole 22 is adapted to the mounting protrusion 33, and the mounting groove 21 is adapted to the second connecting part 32 to ensure assembly accuracy. Of course, it is not limited to this; it can also be a clearance fit or an interference fit, etc., depending on the actual needs.

[0093] In this embodiment, preferably, as follows: Figure 5As shown, the battery cell also includes a lower plastic 5, an upper plastic, a welding ring, and a sealing ring 6. The cover plate 1 has a first through hole extending along a first preset direction a1 through both sides. The electrode post 2 is installed within this through hole, and the sealing ring 6 is compressed between the outer wall of the electrode post 2 and the wall of the first through hole. The lower plastic 5 is located on the inner side of the cover plate 1 near the electrode group 4, and has a second through hole corresponding to the first through hole along the first preset direction a1. The welding ring is fitted onto the outside of the electrode post 2 and connected to it by welding. The upper plastic is injection molded around the welding ring, providing insulation and protection. Thus, the upper plastic and the welding ring form an integral, compressed insulation structure 7, which is more stable and reliable, and significantly improves production efficiency.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, Comprising: A cover plate, a pole column, and a connecting member; wherein, the pole column is installed on the cover plate, and the pole column is formed with an installation groove and an installation through-hole that are arranged in sequence and communicate with each other along a first preset direction, and the installation groove penetrates through the inner side of the pole column close to the electrode group, and the installation through-hole penetrates through the outer side of the pole column far from the electrode group; The connecting member includes a first connecting portion, a second connecting portion, and an installation protruding portion that are connected in sequence, and along the first preset direction, the installation protruding portion is arranged on the outer side of the second connecting portion far from the electrode group; the first connecting portion is located on the inner side of the cover plate close to the electrode group and is used to connect the electrode tab cluster of the electrode group; the second connecting portion is installed in the installation groove, the installation protruding portion is installed in the installation through-hole, and along the first preset direction, the second connecting portion is formed with a welding area located outside the projection of the installation protruding portion.

2. The battery cell according to claim 1, characterized in that, The second connecting portion includes a plug-in portion and a welding portion that are connected; wherein, along a second preset direction perpendicular to the first preset direction, the welding portion is arranged on the side of the plug-in portion; along the first preset direction, the installation protruding portion is arranged at one end of the welding portion far from the electrode group.

3. The battery cell according to claim 2, characterized in that, Along a third preset direction perpendicular to the first preset direction, at least one side of the plug-in portion is formed with an auxiliary heat dissipation portion that exceeds the welding portion.

4. The battery cell according to claim 2, characterized in that, The plug-in portion and the first connecting portion are combined into an L-shaped plate structure.

5. The battery cell according to claim 2, characterized in that, The number of the electrode groups is two, and the number of the first connecting portion and the plug-in portion is also two, and they respectively correspond to the two electrode groups one by one, and along the second preset direction, the two plug-in portions and the two first connecting portions are symmetrically arranged on opposite sides of the welding portion respectively.

6. The battery cell according to claim 2, characterized in that, The welding portion and the plug-in portion are combined into a cuboid structure or a cube structure; and / or The installation protruding portion is a cuboid or a cube; and / or The plug-in portion is arranged along the first preset direction; and / or The installation protruding portion, the welding portion, the plug-in portion, and the first connecting portion are of an integral structure.

7. The battery cell according to claim 1, characterized in that, Along the first preset direction, on the side of the pole column背离 the electrode group, a welding thinning area is formed on the outer periphery of the installation through-hole, and is arranged corresponding to the welding area along the first preset direction.

8. The battery cell according to claim 7, characterized in that, Along the first preset direction, the depth of the welding thinning area is L1, and 0.5mm < L1 < 0.7mm; and / or Along the direction perpendicular to the first preset direction, the width of the welding thinning area is L0, and 2mm < L0 < 3mm; and / or Along the direction perpendicular to the first preset direction, the width of the welding thinning area is L0, along the first preset direction, the projection of the installation protruding portion falls into the projection of the second connecting portion, and the gap between the two projections along the second preset direction perpendicular to the first preset direction is L2, and the gap between the two projections along the third preset direction perpendicular to the first preset direction is L3, and L2 > L0, L3 > L0; and / or The welding thinning area and the welding area are adapted annular areas.

9. The battery cell according to claim 1, characterized in that, Along the first preset direction, the mounting protrusion does not protrude beyond the pole post, and the height difference between them is S, where 0.1mm < S < 0.2mm; and / or Along the first preset direction, the height of the mounting protrusion is h, and 0.6mm < h < 1.2mm; and / or Along the first preset direction, the depth of the mounting groove is H, and 4mm. <H<5mm。 10. The battery cell according to any one of claims 1 to 9, characterized in that, The mounting through hole is adapted to the mounting protrusion, and the mounting groove is adapted to the second connecting portion; and / or The battery cell further includes a lower plastic, an upper plastic, a welding ring, and a sealing ring; wherein, the cover plate has a first through hole extending through both sides along the first preset direction, the electrode post is installed in the first through hole, and the sealing ring is compressed between the outer wall of the electrode post and the wall of the first through hole; the lower plastic is disposed on the inner side of the cover plate near the electrode assembly, and along the first preset direction, the lower plastic has a second through hole corresponding to the first through hole; the welding ring is sleeved on the outside of the electrode post and connected to the electrode post by welding; the upper plastic is wrapped around the outside of the welding ring by injection molding.

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