Novel battery cell
By designing and installing a new type of connecting component structure with protrusions and welding areas in the battery cell, the problem of assembling the connecting piece and the electrode post is solved, the welding quality and heat dissipation effect are improved, and the welding strength and space utilization are enhanced.
Patent Information
- Application Number
- CN202520009235.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-02
AI Technical Summary
The assembly structure of the connecting piece and the terminal in the existing battery cell is difficult to observe, and the welding operation is difficult and prone to cold solder joints.
A novel battery cell structure was designed, which features an installation protrusion on the connecting component, allowing it to be installed in the mounting through hole of the electrode post. A welding area is set below the installation protrusion to facilitate observation of whether the assembly is in place and to perform through welding, thereby reducing the risk of incomplete soldering.
The welding quality was improved, the space occupied by the connecting piece inside the cell was reduced, the mating area with the terminal post was increased, the heat dissipation effect was improved, and the welding strength and space utilization were enhanced.
Smart Images
Figure CN223843132U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a novel battery cell. Background Technology
[0002] Currently, a battery cell consists of electrode groups, connecting tabs, and a cover plate assembly. The connecting tabs are welded to the tab clusters connecting the electrode groups 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 cold solder joints are prone to occur, and welding spatter can easily fall into the through hole. It is clear that 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 new type of battery cell, which to a certain extent solves the technical problems existing in the prior art, such as the need to develop a new type of assembly structure for connecting pieces and terminals, which is convenient for observing whether the installation is in place, and for welding operations, and is less prone to problems such as poor soldering.
[0004] This application provides a novel battery cell, comprising: a cover plate, a terminal post, and a connecting member; wherein, a welding groove is formed on the outer side of the cover plate away from the electrode group; the terminal post is mounted on the cover plate, and the terminal post has a mounting groove and a mounting through hole sequentially arranged and connected along a first preset direction, wherein 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; the connecting member includes a first connecting portion, a second connecting portion, and a mounting protrusion sequentially connected, and along the first preset direction, the mounting protrusion is disposed on the outer side of the second connecting portion away from the electrode group;
[0005] The first connecting part 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 part is installed in the mounting groove, the mounting protrusion is installed in the mounting through hole, and along the first preset direction, the second connecting part forms a welding area located outside the projection of the mounting protrusion.
[0006] In the above technical solution, the welding groove extends along the circumferential edge of the cover plate.
[0007] In any of the above technical solutions, the welding groove is further described as an annular groove.
[0008] In any of the above technical solutions, further, reinforcing ribs are formed on the inner side of the cover plate near the electrode group and / or on the outer side away from the electrode group.
[0009] In any of the above technical solutions, the reinforcing rib further includes a pole reinforcing rib, and the pole reinforcing rib is arranged around the outer periphery of the pole.
[0010] In any of the above technical solutions, the novel battery cell further includes an explosion-proof valve, the cover plate is formed with an explosion-proof valve mounting through hole extending through both sides along the first preset direction, and the explosion-proof valve is installed in the explosion-proof valve mounting through hole; the reinforcing rib also includes an explosion-proof valve reinforcing rib, and the explosion-proof valve reinforcing rib extends around the outer periphery of the explosion-proof valve mounting through hole.
[0011] In any of the above technical solutions, the second connecting portion further includes a plug-in portion and a welding portion connected together; wherein, along a second preset direction perpendicular to the first preset direction, the welding portion is disposed on the side of the plug-in portion; along the first preset direction, the mounting protrusion is disposed at the end of the welding portion away from the electrode group.
[0012] 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.
[0013] 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.
[0014] In any of the above technical solutions, the mounting protrusion, the insertion part, the welding part, and the first connecting part are further integrated into a single structure.
[0015] 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.
[0016] 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 the welding thinning area is correspondingly provided with the welding area.
[0017] 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。
[0018] 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。
[0019] 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.
[0020] In any of the above technical solutions, the welding thinning zone and the welding zone are further defined as matching annular regions.
[0021] 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.
[0022] 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.
[0023] 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。
[0024] 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.
[0025] In any of the above technical solutions, the novel 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.
[0026] Compared with the prior art, the beneficial effects of this application are as follows:
[0027] In the novel 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 requirements for personnel. 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 cell, thereby improving space utilization.
[0028] In addition, the parts of the connecting member that mate with the pole post are the second connecting part and the mounting protrusion. Compared with the sheet structure, the mating area with the pole post is increased, which helps to improve heat dissipation. In particular, the exposure of the mounting protrusion further improves the heat dissipation effect and helps to ensure the performance of the battery cell.
[0029] Furthermore, for today's large-size battery cells, as the size increases, more gas is generated inside the cell, and the welding strength needs to be enhanced. Therefore, the weld penetration and width increase accordingly. During welding, more molten metal is used. In this application, a welding groove is provided on the cover plate to allow the molten metal to flow in, thereby avoiding the problem of the molten metal flowing out randomly. This increases the bonding strength between the cover plate and the shell while ensuring aesthetics. Attached Figure Description
[0030] 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.
[0031] Figure 1 An exploded view of the novel battery cell provided in the embodiments of this application;
[0032] Figure 2 A cross-sectional view of the cover plate provided in an embodiment of this application;
[0033] Figure 3 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this application;
[0034] Figure 4 for Figure 3 A magnified structural diagram at point A;
[0035] Figure 5 This is another structural schematic diagram of the cover plate provided in an embodiment of this application;
[0036] Figure 6 This is a schematic diagram of the structure of the connecting member provided in the embodiments of this application;
[0037] Figure 7 This is another structural schematic diagram of the connecting member provided in an embodiment of this application;
[0038] Figure 8 Another structural schematic diagram of the connecting member provided in the embodiments of this application;
[0039] Figure 9 This is a schematic diagram of the pole structure provided in an embodiment of this application;
[0040] Figure 10 This is another structural schematic diagram of the pole provided in an embodiment of this application;
[0041] Figure 11 Another structural schematic diagram of the pole provided in the embodiments of this application;
[0042] Figure 12 A partial cross-sectional view of the novel battery cell provided in an embodiment of this application.
[0043] Figure label:
[0044] 1-Cover plate, 11-Welding groove, 12-Reinforcing rib, 121-Pole post reinforcing rib, 122-Explosion-proof valve reinforcing rib, 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, 323-Auxiliary heat dissipation part, 324-Welding area, 33-Mounting protrusion, 4-Pole group, 41-Pole lug cluster, 5-Lower plastic, 6-Sealing ring, 7-Compression insulation structure, 8-Outer shell. Detailed Implementation
[0045] 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.
[0046] 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.
[0047] 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.
[0048] 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.
[0049] 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.
[0050] The following reference Figures 1 to 12 This application describes a novel battery cell according to some embodiments.
[0051] See Figures 1 to 4 , Figures 6 to 12 As shown, an embodiment of this application provides a novel battery cell, including: a cover plate 1, a terminal post 2, and a connecting member 3; wherein, a welding groove 11 is formed on the outer side of the cover plate 1 away from the electrode group 4; 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 arranged and connected along a first preset direction a, 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; the connecting member 3 includes a first connecting part 31, a second connecting part 32, and a mounting protrusion 33 that are sequentially connected, and the mounting protrusion 33 is disposed on the outer side of the second connecting part 32 away from the electrode group 4 along the first preset direction a;
[0052] 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 41 of the electrode group 4; the second connecting part 32 is installed in the mounting groove 21, and 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, and along the first preset direction a, the second connecting part 32 forms a welding area 324 located outside the projection of the mounting protrusion 33.
[0053] As can be seen from the structure described above, in the novel battery cell provided by this application, by redesigning the structure of the connecting piece and the pole 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 pole 2. Since the structure is exposed, it is easy to observe whether the assembly is in place. Moreover, a welding area 324 is provided on the side of the connecting member 3 below the mounting protrusion 33. In this way, the pole 2 structure located outside the mounting protrusion 33 and the welding area 324 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 pole 2, space is greatly saved and the space occupied by the connecting piece inside the battery cell is effectively reduced, thereby improving the space utilization rate.
[0054] In addition, the parts of the connecting member 3 that cooperate with the pole post 2 are the second connecting part 32 and the mounting protrusion 33. Compared with the sheet structure, the cooperation area with the pole post 2 is increased, which helps to improve heat dissipation. In particular, the exposure of the mounting protrusion 33 further improves the heat dissipation effect and helps to ensure the performance of the battery cell.
[0055] Furthermore, for today's large-size battery cells, as the size increases, more gas is generated inside the cell, and the welding strength needs to be enhanced. Therefore, the weld penetration and weld width are correspondingly increased. During welding, a large amount of molten metal is produced. In this application, a welding groove 11 is provided on the cover plate 1 to allow the molten metal to flow in, thereby avoiding the problem of the molten metal flowing out randomly. This not only increases the bonding strength between the cover plate 1 and the outer shell 8, but also ensures aesthetics.
[0056] Furthermore, preferably, the aforementioned first preset direction a can be the thickness direction of the cover plate 1 or the height 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.
[0057] In this embodiment, preferably, as follows: Figure 3 and Figure 4 As shown, the welding groove 11 extends along the circumferential edge of the cover plate 1 and corresponds to the circumferential edge of the opening of the outer shell 8, increasing the welding area and improving the stability and firmness of the welding.
[0058] Furthermore, preferably, the welding groove 11 is an annular groove extending along the circumferential edge of the cover plate 1. Of course, it is not limited to this. The welding groove 11 can also be part of an annular groove. In this case, there are multiple welding grooves 11, which are arranged sequentially at intervals along the circumferential edge of the cover plate 1, etc., depending on the actual needs.
[0059] In this embodiment, preferably, as follows: Figure 2 and Figure 5 As shown, a reinforcing rib 12 is formed on the inner side of the cover plate 1 near the pole group 4.
[0060] As can be seen from the structure described above, reinforcing ribs 12 are provided at the weak points of the cover plate 1 to ensure the strength of the cover plate 1 and effectively prevent the cover plate 1 from deforming abnormally due to the battery cell during use.
[0061] It should be noted that, not limited to the above, the position of the reinforcing rib 12 can also be designed according to actual needs. For example, the reinforcing rib 12 can also be set on the outer side of the cover plate 1 away from the pole group 4, depending on the actual needs.
[0062] In this embodiment, preferably, as follows: Figure 5 As shown, the reinforcing rib 12 includes a pole reinforcing rib 121, and the pole reinforcing rib 121 is arranged around the outer periphery of the pole 2.
[0063] As can be seen from the structure described above, the strength of the cover plate 1 at the pole post 2 is relatively low. Therefore, pole post reinforcing ribs 121 are set on the cover plate 1 structure around the pole post 2 to increase the strength of this part and avoid abnormal deformation of the cover plate 1.
[0064] In this embodiment, preferably, as follows: Figure 5 As shown, the new battery cell also includes an explosion-proof valve. The cover plate 1 has an explosion-proof valve mounting through hole 22 extending through both sides along a first preset direction a, and the explosion-proof valve is installed in the explosion-proof valve mounting through hole 22. The reinforcing rib 12 also includes an explosion-proof valve reinforcing rib 122, and the explosion-proof valve reinforcing rib 122 extends around the outer periphery of the explosion-proof valve mounting through hole 22.
[0065] As can be seen from the structure described above, the cover plate 1 at the explosion-proof valve has low strength, especially during exhaust, when this position receives a large impact. Therefore, a pole reinforcing rib 121 is set on the cover plate 1 structure on the outer periphery of the explosion-proof valve to increase the strength of this part and avoid abnormal deformation of the cover plate 1.
[0066] It should be noted that: reinforcing ribs 12 are not limited to the above-mentioned reinforcing ribs 2 and the outer periphery of the explosion-proof valve. Reinforcing ribs 12 can also be set in other positions, depending on the actual needs.
[0067] In this embodiment, preferably, as follows: Figures 6 to 12 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 b perpendicular to the first preset direction a, the welding part 322 is disposed on the side of the plug-in part 321; along the first preset direction a, a mounting protrusion 33 is disposed at one end of the welding part 322 away from the electrode group 4.
[0068] As can be seen from the structure described above, the welding part 322 mainly serves to penetrate and weld with the pole post 2 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.
[0069] Furthermore, preferably, the second preset direction b is the width direction of the cover plate 1, which can also be understood as the width direction of the electrode group 4 or the thickness direction of the electrode group 4. Of course, it is not limited to this and can be designed according to actual needs.
[0070] In this embodiment, preferably, as follows: Figure 6 As shown, along a third preset direction c perpendicular to the first preset direction a, auxiliary heat dissipation portions 323 extending beyond the welding portion 322 are formed on both sides of the insertion portion 321.
[0071] 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 cell.
[0072] Furthermore, preferably, the third preset direction c 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 aforementioned first preset direction a, second preset direction b, and third preset direction c are perpendicular to each other. Of course, it is not limited to this. It should also be noted that: preferably, the length direction of the pole tab cluster 41 of the pole group 4 is the same as the length direction of the pole group 4, and the width direction of the pole tab cluster 41 of the pole group 4 is the same as the width direction of the pole group 4.
[0073] 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 c. Auxiliary heat dissipation parts 323 can also be provided in multiple 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.
[0074] In this embodiment, preferably, as follows: Figure 6As 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.
[0075] 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 tab cluster 41 and helps to save space and improve space utilization. The plug-in part 321 is preferably set along the first preset direction a, such as the vertical direction, so as to facilitate insertion into the mounting groove 21 set along the first preset direction a, such as the vertical direction. It should be noted that the plug-in part 321 is not limited to being set along the first preset direction a, but it can also be set at an angle to the first preset direction a.
[0076] 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.
[0077] In this embodiment, preferably, as follows: Figure 1 and Figure 12 As shown, there are two pole groups 4, and the two pole groups 4 share two pole posts 2, one positive pole post 2 and one negative pole post 2. 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 b, the two plug-in parts 321 and the two first connecting parts 31 are symmetrically arranged on opposite sides of the welding part 322.
[0078] As can be seen from the structure described above, for the structure of two pole groups 4 and one pole post 2, one of the first connecting parts 31 is welded to the pole lugs 41 of one of the pole groups 4, and the other first connecting part 31 is welded to the pole lugs 41 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, that is, they share a welding part 322. 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.
[0079] 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.
[0080] 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. The structure of the connecting member 3 is as follows. For the additional single pole group 4, the structure of the connecting piece when there is one pole group 4 is adopted. That is, for the additional pole group 4 and the single pole post 2, a plug-in part 321 and a first connecting part 31 are provided, or other types of connecting piece structures are used. 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 a welding part 322 and other structures. Each pole group 4 and the single pole post 2 may also be provided with a separate connecting member 3, and each pole group 4 will not interfere with each other.
[0081] In addition, it should be noted that in this embodiment, the number of pole posts 2 installed on the same cover plate 1 is not limited to the two mentioned above, but can also be one, depending on actual needs.
[0082] In this embodiment, preferably, as follows: Figure 10 As shown, along the first preset direction a, a welding thinning area 23 is formed on the side of the pole post 2 away from the pole group 4, that is, on the outer side, located on the periphery of the mounting through hole 22, and the welding thinning area 23 is correspondingly provided with the welding area 324.
[0083] As can be seen from the structure described above, a groove is made on the pole post 2 above the welding area 324 of the connecting member 3. That is, a groove is made on the pole post 2 on the outer periphery of the mounting protrusion 33, with the side and top penetrating grooves. This can reduce the thickness of the pole post 2 on the outer periphery of the mounting protrusion 33, making it easier to penetrate the weld and improving the effect of penetration welding. It can also block welding spatter and protect other structures outside the welding area 324.
[0084] 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.
[0085] In this embodiment, preferably, as follows: Figure 6 , Figure 7 and Figure 10 As shown, the welding thinning zone 23 and the welding zone 324 are matching annular regions.
[0086] As can be seen from the structure described above, the use of annular welding thinning zone 23 and annular welding zone 324 results in a larger welding area, a more uniform distribution of welding zone 324, a stronger and more stable structure after welding, and a better welding effect.
[0087] It should be noted that the welding thinning zone 23 and the welding zone 324 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.
[0088] In this embodiment, preferably, as follows: Figure 11 As shown, along the first preset direction a, the depth of the welding thinning zone 23 is L1, and 0.5mm. <L1<0.7mm。
[0089] Based on the structure described above, it is clear that if the depth of the weld thinning zone 23 is too small, it will hinder welding and prevent spatter. If the depth of the weld thinning zone 23 is too large, the pole post 2 below the weld thinning zone 23 will be too thin, leading to structural instability after penetration welding. Therefore, the depth L1 of the weld thinning zone 23 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.
[0090] In this embodiment, preferably, as follows: Figure 10 As shown, along the direction perpendicular to the first preset direction a, the width of the welding thinning region 23 is L0, and 2mm. <L0<3mm。
[0091] Based on the structure described above, if the width of the weld thinning zone 23 is too small, the width of the weld zone 324 will be small, resulting in a small weld area and an unstable and unreliable structure after welding. If the width of the weld thinning zone 23 is too large, the width of the weld zone 324 will be large, resulting in more welding spatter, which will have a greater impact on other parts and is prone to interference. Therefore, the width L0 of the weld thinning zone 23 should be within the range of 2mm-3mm. Of course, the range of L0 is not limited to the above; L0 can also be ≤2mm or ≥3mm, depending on the actual needs.
[0092] In this embodiment, preferably, as follows: Figure 7 and Figure 10 As shown, along the direction perpendicular to the first preset direction a, the width of the welding thinning area 23 is L0. Along the first preset direction a, the projection of the mounting protrusion 33 falls into the projection of the second connecting part 32, and the gap between the two projections along the length direction of the tab cluster 41 is L2, and the gap between the two projections along the width direction of the tab cluster 41 is L3, and L2>L0, L3>L0.
[0093] As described above, only by ensuring L2 > L0 and L3 > L0 can the area below the weld thinning zone 23 be completely covered by the weld zone 324, thus guaranteeing the weld area. Of course, this is not the only requirement; the design can be tailored to specific needs.
[0094] In this embodiment, preferably, as follows: Figure 12 As shown, along the first preset direction a, the protrusion 33 does not protrude from the pole post 2, and the height difference between the two is S, and 0.1mm < S < 0.2mm.
[0095] 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.
[0096] In this embodiment, preferably, as follows: Figure 8 As shown, along the first preset direction a, the height of the protrusion 33 is h, and 0.6mm < h < 1.2mm.
[0097] Based on the structure described above, the height h of the mounting protrusion 33 should be within the range of 0.6mm-1.2mm. This satisfies the requirements for observation and positioning, avoids excessive design margins to prevent increased material consumption, improves 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.
[0098] In this embodiment, preferably, as follows: Figure 11 As shown, along the first preset direction a, the depth of the mounting groove 21 is H, and 4mm. <H<5mm。
[0099] 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.
[0100] In this embodiment, preferably, as follows: Figure 6 and Figure 7 As shown, the welding area 324 is an annular region surrounding the mounting protrusion 33 and projected along the first preset direction a.
[0101] As can be seen from the structure described above, the annular welding area 324 is set around the entire outer periphery of the mounting protrusion 33, resulting in a larger welding area, a more uniform distribution of the welding area 324, a more robust and stable structure after welding, and a better welding effect.
[0102] It should be noted that the welding area 324 is not limited to the aforementioned annular area, but can also be a fan-shaped annular area, that is, a part of the annular area, or an area of other shapes, depending on the actual needs of the design.
[0103] In this embodiment, preferably, as follows: Figure 6 , Figure 9 and Figure 12 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.
[0104] In this embodiment, preferably, as follows: Figure 6 As shown, the mounting protrusion 33, the insertion part 321, the welding part 322, and the first connecting part 31 are an integral structure. This integral structure has high strength, is not easily damaged, and requires no further assembly. Of course, it is not limited to this; it can also be a separate structure, assembled later by welding or other methods, depending on the actual needs.
[0105] 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 (i.e., the positive electrode post 2 and the positive electrode lug 41 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 (i.e., the negative electrode post 2 and the negative electrode lug 41 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 (e.g., both can be copper), and the plug-in part 321 and the first connecting part 31 are made of the same material (e.g., both can be aluminum). Regardless of whether the various parts of the connecting member 3 are made of the same material, they can all be rolled into an integral structure, etc.
[0106] In this embodiment, preferably, as follows: Figure 6As 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.
[0107] In this embodiment, preferably, as follows: Figure 6 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.
[0108] In this embodiment, preferably, as follows: Figure 12 As shown, the new 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 through both sides along a first preset direction a. The electrode post 2 is installed within the first 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 along the first preset direction a, the lower plastic 5 has a second through hole corresponding to the first through hole. The welding ring is fitted onto the outside of the electrode post 2 and connected to the electrode post 2 by welding. The upper plastic is injection molded around the outside of the welding ring, providing insulation and protection. It is evident that 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.
[0109] 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 novel battery cell, characterized in that, Comprising: A cover plate, a pole column, and a connecting member; wherein, a welding groove is formed on the outer side of the cover plate facing away from the electrode group; 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 sequentially arranged and connected 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 protrusion portion that are sequentially connected, and along the first preset direction, the installation protrusion 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 protrusion portion is installed in the installation through-hole, and along the first preset direction, the second connecting portion forms a welding area located outside the projection of the installation protrusion portion.
2. The novel battery cell according to claim 1, characterized in that, The welding groove extends along the circumferential edge of the cover plate; and / or The welding groove is an annular groove.
3. The novel battery cell according to claim 1, characterized in that, Reinforcing ribs are formed on the inner side and / or the outer side of the cover plate close to the electrode group.
4. The novel battery cell according to claim 3, characterized in that, The reinforcing ribs include pole column reinforcing ribs, and the pole column reinforcing ribs are arranged around the outer circumference of the pole column.
5. The novel battery cell according to claim 3, characterized in that, The novel battery cell further includes an explosion-proof valve. The cover plate is formed with an explosion-proof valve installation through-hole that penetrates through both sides thereof along the first preset direction, and the explosion-proof valve is installed in the explosion-proof valve installation through-hole; the reinforcing ribs further include explosion-proof valve reinforcing ribs, and the explosion-proof valve reinforcing ribs extend around the outer circumference of the explosion-proof valve installation through-hole.
6. The novel 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 protrusion portion is arranged at one end of the welding portion far from the electrode group.
7. The novel battery cell according to claim 6, characterized in that, Along a third preset direction perpendicular to the first preset direction, at least one side of the plug-in portion forms an auxiliary heat dissipation portion that exceeds the welding portion; and / or The plug-in portion and the first connecting portion are combined into an L-shaped plate structure; and / or The installation protrusion portion, the plug-in portion, the welding portion, and the first connecting portion are of an integral structure; and / or The number of the electrode groups is two, and the number of the first connecting portions and the plug-in portions 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 the opposite sides of the welding portion respectively.
8. The novel battery cell according to claim 1, characterized in that, Along the first preset direction, a welding thinning area is formed on the side of the pole column facing away from the electrode group and located on the outer circumference of the installation through-hole, and the welding thinning area is arranged corresponding to the welding area.
9. The novel battery cell according to claim 8, 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 mounting protrusion falls within 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 regions.
10. The novel battery cell according to any one of claims 1 to 9, characterized in that, Along the first preset direction, the mounting protrusion does not protrude from the pole column, and the height difference between the two is S, and 0.1 mm < S < 0.2 mm; and / or Along the first preset direction, the height of the mounting protrusion is h, and 0.6 mm < h < 1.2 mm; and / or Along the first preset direction, the depth of the mounting groove is H, and 4 mm < H < 5 mm; and / or The mounting through hole is adapted to the mounting protrusion, and the mounting groove is adapted to the second connecting portion; and / or The new type of battery cell further includes a lower plastic, an upper plastic, a welding ring and a sealing ring; wherein, the cover plate is formed with a first through hole penetrating through both sides thereof along the first preset direction, the pole column is installed in the first through hole, and the sealing ring sleeve is compressed between the outer wall of the pole column and the hole wall of the first through hole; the lower plastic is arranged on the inner side of the cover plate close to the electrode group, and along the first preset direction, the lower plastic is formed with a second through hole corresponding to the first through hole; the welding ring is sleeved outside the pole column and is connected to the pole column by welding; the upper plastic is wrapped outside the welding ring by injection molding.