Battery cell with novel assembly structure
By designing and installing a connecting component structure with protrusions and welding areas in the battery cell, the problems of observation and welding between the connecting piece and the electrode post are solved, improving welding quality and space utilization, and enhancing the heat dissipation and safety of the battery cell.
Patent Information
- Application Number
- CN202520009604.6
- 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 existing battery cell assembly structure for connecting pieces and terminals suffers from problems such as inadequate observation, difficult welding, and susceptibility to incomplete soldering, resulting in poor welding quality.
A novel assembly structure was designed, including mounting protrusions on the connecting components. These protrusions are exposed inside and outside the mounting through holes of the pole posts, making it easy to observe whether the assembly is in place. A welding area is set below the mounting protrusions to facilitate penetration welding. At the same time, venting grooves and venting channels are set on the insulating components to quickly expel the gas inside the battery cell.
It improves welding quality, reduces the occurrence of incomplete welds and welding spatter, saves internal space of the battery cell, increases heat dissipation area, and improves the safety and reliability of the battery cell.
Smart Images
Figure CN223843133U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a battery cell with a novel assembly structure. 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 battery cell with a novel assembly structure, which to some extent solves the technical problem in the prior art that there is a need to develop a new assembly structure for connecting pieces and terminals to facilitate observation of whether the installation is in place, facilitate welding operations, and reduce the likelihood of problems such as poor soldering.
[0004] This application provides a battery cell with a novel assembly structure, comprising: a cover plate, a first insulating component, an explosion-proof valve, a terminal post, and a connecting component; wherein, along a first preset direction, the first insulating component is installed on the inner side of the cover plate near the electrode group; the explosion-proof valve is installed in a through hole of the cover plate; the first insulating component forms a first venting groove, a second venting groove, and a venting channel, and along the first preset direction, the first venting groove is disposed below the explosion-proof valve; both the first venting groove and the second venting groove form venting through holes; the second venting groove is disposed on the side of the first venting groove and is connected to the first venting groove through the venting channel;
[0005] The electrode post is mounted on the cover plate, and the first insulating member has a clearance through hole to avoid the electrode post; the electrode post has a mounting groove and a mounting through hole that are sequentially arranged and connected along a first preset direction, and the mounting groove passes through the inner side of the electrode post near the electrode group, and the mounting through hole passes through the outer side of the electrode post away from the electrode group; the connecting member includes a first connecting part, a second connecting part, and a mounting protrusion that are sequentially connected, and along the first preset direction, the mounting protrusion is located on the outer side of the second connecting part away from the electrode group;
[0006] The first connecting portion is located on the inner side of the first insulating member near the electrode group and is used to connect the electrode group's tab cluster; the second connecting portion 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 portion forms a welding area located outside the projection of the mounting protrusion.
[0007] In the above technical solution, the second venting groove is further formed at at least one end of the first insulating member along its length direction.
[0008] In any of the above technical solutions, the air guide groove extends along the length direction of the first insulating member.
[0009] In any of the above technical solutions, the first exhaust groove and the second exhaust groove both extend along the width direction of the first insulating member.
[0010] In any of the above technical solutions, the exhaust through hole on the first exhaust groove includes a first exhaust through hole and a second exhaust through hole, and the first exhaust through hole is formed on the bottom wall of the first exhaust groove near the electrode group side, and the second exhaust through hole is formed on the side wall of the first exhaust groove.
[0011] In any of the above technical solutions, the first insulating member further includes a plurality of separate insulating members, and the plurality of separate insulating members are arranged sequentially at intervals along the length direction of the cover plate; wherein the separate insulating member located below the explosion-proof valve along the first preset direction forms the first exhaust groove, the second exhaust groove and the air guide groove; the remaining first insulating members form the second exhaust groove and the air guide groove, and the air guide groove passes through one end of the first insulating member along the length direction of the cover plate.
[0012] 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.
[0013] 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.
[0014] 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.
[0015] 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.
[0016] 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.
[0017] 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.
[0018] 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。
[0019] In any of the above technical solutions, the width of the weld thinning zone is further L0, and 2mm. <L0<3mm。
[0020] 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.
[0021] In any of the above technical solutions, the welding thinning zone and the welding zone are further defined as matching annular regions.
[0022] 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.
[0023] 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.
[0024] 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。
[0025] In any of the above technical solutions, the welding area is further defined as an annular region surrounding the mounting protrusion along the first preset direction.
[0026] 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.
[0027] In any of the above technical solutions, the cover plate is further provided with an injection hole, and the first insulating member located below the injection hole along the first preset direction is provided with a liquid-blocking groove corresponding to the injection hole, and the sidewall of the liquid-blocking groove is provided with a liquid outlet.
[0028] In any of the above technical solutions, the battery cell with the novel assembly structure further includes a second insulating component, 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 welding ring is sleeved on the outside of the electrode post and connected to the electrode post by welding; the second insulating component is wrapped around the outside of the welding ring by injection molding.
[0029] Compared with the prior art, the beneficial effects of this application are as follows:
[0030] In this application, by redesigning the structure of the connecting piece and the pole, a mounting protrusion is provided on the connecting component. The mounting protrusion can be installed in the mounting through hole of the pole. 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 component below the mounting protrusion. This allows for through welding of the pole structure and welding area located outside the mounting 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 component into the mounting groove and mounting through hole of the pole, space is greatly saved, effectively reducing the space occupied by the connecting piece inside the cell, thereby improving space utilization.
[0031] 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.
[0032] Furthermore, in the battery cell with a novel assembly structure provided in this application, the first insulating component is provided with a second venting groove and a venting channel, which allows gas from other locations inside the battery cell to first enter the second venting groove and then be quickly discharged into the first venting groove through the venting channel. The gas is then promptly discharged from the explosion-proof valve above the first venting groove, achieving the purpose of timely pressure relief and improving the safety and reliability of the battery during use. Attached Figure Description
[0033] 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.
[0034] Figure 1 Exploded view of the cover portion of a battery cell with a novel assembly structure provided in an embodiment of this application;
[0035] Figure 2 This is a schematic diagram of the structure of the first insulating element provided in an embodiment of this application;
[0036] Figure 3 This is a schematic diagram of the structure of the first split insulating component provided in the embodiments of this application;
[0037] Figure 4 for Figure 3 A magnified structural diagram at point A;
[0038] Figure 5 This is a schematic diagram of the structure of the second split insulating component provided in the embodiments of this application;
[0039] Figure 6 Another structural schematic diagram of the first split insulating component provided in the embodiments of this application;
[0040] Figure 7 for Figure 6 A magnified structural diagram at point B;
[0041] Figure 8 This is a schematic diagram of the structure of the connecting member provided in the embodiments of this application;
[0042] Figure 9 This is another structural schematic diagram of the connecting member provided in an embodiment of this application;
[0043] Figure 10 Another structural schematic diagram of the connecting member provided in the embodiments of this application;
[0044] Figure 11 This is a schematic diagram of the pole structure provided in an embodiment of this application;
[0045] Figure 12 This is another structural schematic diagram of the pole provided in an embodiment of this application;
[0046] Figure 13 Another structural schematic diagram of the pole provided in the embodiments of this application;
[0047] Figure 14 A partial cross-sectional view of a battery cell with a novel assembly structure provided in an embodiment of this application.
[0048] Figure label:
[0049] 1-Cover plate, 101-Injection hole, 2-Electrode 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-Electrode group, 41-Electrode lug cluster, 5-First insulating component, 51-First split insulating component, 52-Second split insulating component, 53-First vent groove, 54-Second vent groove, 55-Gas guide groove, 56-Liquid blocking groove, 57-Liquid distribution port, 58-First vent through hole, 59-Second vent through hole, 510-Third vent through hole, 6-Sealing ring, 7-Welding ring, 8-Second insulating component, 9-Compression insulation structure, 10-Explosion-proof valve. Detailed Implementation
[0050] 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.
[0051] 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.
[0052] 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.
[0053] 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.
[0054] 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.
[0055] The following reference Figures 1 to 14 This application describes a battery cell with a novel assembly structure according to some embodiments.
[0056] See Figures 1 to 14As shown, an embodiment of this application provides a battery cell with a novel assembly structure, including: a cover plate 1, a first insulating member 5, an explosion-proof valve 10, a pole post 2, and a connecting member 3; wherein, along a first preset direction a, the first insulating member 5 is installed on the inner side of the cover plate 1 near the pole group 4; the explosion-proof valve 10 is installed in the through hole of the cover plate 1; the first insulating member 5 forms a first venting groove 53, a second venting groove 54, and a venting channel 55 recessed toward the pole group 4, and along the first preset direction a, the first venting groove 53 is disposed below the explosion-proof valve 10; both the first venting groove 53 and the second venting groove 54 form venting through holes; the second venting groove 54 is disposed on the side of the first venting groove 53 and is connected to the first venting groove 53 through the venting channel 55;
[0057] The pole post 2 is mounted on the cover plate 1, and the first insulating member 5 has a clearance through hole to avoid the pole post 2; the pole post 2 has a mounting groove 21 and a mounting through hole 22 that are sequentially arranged and connected along the first preset direction a, and the mounting groove 21 penetrates the inner side of the pole post 2 near the pole group 4, and the mounting through hole 22 penetrates the outer side of the pole post 2 away from the pole 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 along the first preset direction a, the mounting protrusion 33 is located on the outer side of the second connecting part 32 away from the pole group 4;
[0058] The first connecting part 31 is located on the inner side of the first insulating member 5 near the pole group 4 and is used to connect the pole lugs 41 of the pole 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, 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.
[0059] As can be seen from the structure described above, in 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 cell is effectively reduced, thereby improving the space utilization rate.
[0060] 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.
[0061] Furthermore, in the battery cell with the novel assembly structure provided in this application, the first insulating member 5 is provided with a second venting groove 54 and a venting channel 55. Gas from other locations inside the battery cell first enters the second venting groove 54 and is quickly discharged into the first venting groove 53 through the venting channel 55. Then, the gas is discharged from the battery cell in a timely manner through the explosion-proof valve 10 above the first venting groove 53, thereby achieving the purpose of timely pressure relief and improving the safety and reliability of the battery during use.
[0062] Furthermore, preferably, the aforementioned first preset direction a 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.
[0063] Furthermore, preferably, the cover plate 1 has a first through hole extending through both sides along the first preset direction, the pole post 2 is installed in the first through hole, and the avoidance through hole on the first insulating member 5 is located directly below the first through hole along the second preset direction, so as to avoid the pole post 2.
[0064] Furthermore, preferably, the first insulating element 5 can be a plastic element, i.e., the lower plastic, but of course, it is not limited to this.
[0065] In this embodiment, preferably, as follows: Figure 2 As shown, the first insulating member 5 has second venting grooves 54 formed at both ends along its length direction, and preferably, the first venting groove 53 is disposed between the two second venting grooves 54.
[0066] As can be seen from the structure described above, the gas generated by thermal runaway at both ends is quickly discharged to the first exhaust groove 53 in the middle through the second exhaust groove 54 and the air guide groove 55 along the length of the first insulating member 5, that is, the length of the battery cell with the novel assembly structure, thereby achieving the purpose of rapid pressure relief.
[0067] It should be noted that, in addition to the above, the second exhaust groove 54 can also be formed at only one end along the length of the first insulating member 5, or the second exhaust groove 54 can be set at other positions, depending on the actual needs.
[0068] In this embodiment, preferably, as follows: Figure 2 As shown, the air guide groove 55 extends along the length direction of the first insulating member 5.
[0069] As can be seen from the structure described above, since the second exhaust groove 54 is located at the end of the first insulating member 5 along its length direction, it is necessary to extend the air guide groove 55 along the length direction of the first insulating member 5, so as to quickly discharge the high temperature and high pressure gas in the second exhaust groove 54 into the middle first exhaust groove 53 in the shortest distance.
[0070] It should be noted that, not only is the air guide groove 55 extended along the length direction of the first insulating member 5 as described above, but the air guide groove 55 can also be arranged in other directions, such as the air guide groove 55 can also be arranged in a curved shape, etc. In particular, when the second exhaust groove 54 is no longer arranged at one end of the first insulating member 5 along its length direction, the extension direction of the air guide groove 55 will also change accordingly, such as the air guide groove 55 can be arranged along a direction that forms an angle with the length direction of the first insulating member 5, etc.
[0071] In this embodiment, preferably, as follows: Figure 2 As shown, both the first exhaust groove 53 and the second exhaust groove 54 extend along the width direction of the first insulating member 5, which means that the length direction of the first exhaust groove 53 and the second exhaust groove 54 is the same as the width direction of the first insulating member 5.
[0072] As can be seen from the structure described above, the first exhaust groove 53 and the second exhaust groove 54 are along the width direction of the cover plate 1, which can cover the width direction of the electrode group 4, thereby expanding the exhaust range. In addition, the explosion-proof valve 10 is also normally arranged along the width direction of the first insulating member 5, that is, the width direction of the electrode group 4, thereby enabling rapid exhaust over a large range.
[0073] It should be noted that the first exhaust groove 53 and the second exhaust groove 54 may also extend along a direction that forms an angle with the width direction of the first insulating member 5, etc., depending on the actual needs.
[0074] In this embodiment, preferably, as follows: Figure 3 and Figure 4 As shown, the exhaust through-holes on the first exhaust groove 53 include a first exhaust through-hole 58 and a second exhaust through-hole 59. The first exhaust through-hole 58 is formed on the bottom wall of the first exhaust groove 53 near the electrode group 4, and the second exhaust through-hole 59 is formed on the side wall of the first exhaust groove 53. To distinguish the exhaust through-holes on the second exhaust groove 54, the exhaust through-holes on the second exhaust groove 54 are named third exhaust through-hole 510. See also... Figure 6 As shown.
[0075] As can be seen from the structure described above, the high-temperature and high-pressure gas generated inside the battery cell can be introduced into the exhaust groove through the first exhaust hole 58 in the vertical direction and the second exhaust hole 59 in the horizontal direction, and then discharged through the explosion-proof valve 10 above the exhaust groove. In particular, in this application, the first exhaust hole 58 is in the vertical direction and the second exhaust hole 59 is in the horizontal direction, so that exhaust can be carried out in all directions, improving the exhaust effect during thermal runaway and improving the safety and reliability of the battery cell.
[0076] It should be noted that: it is not limited to the above, it is also possible to only set the first exhaust port 58 or only set the second exhaust port 59, depending on the actual needs.
[0077] In this embodiment, preferably, as follows: Figures 2 to 5 As shown, the first insulating member 5 includes two separate insulating members 5, and the two separate insulating members 5 are arranged sequentially at intervals along the length direction of the cover plate 1. In order to facilitate the distinction between the two separate insulating members 5, they are now named the first separate insulating member 51 and the second separate insulating member 52, respectively. The separate insulating member 5 located below the explosion-proof valve 10 along the first preset direction a, namely the first separate insulating member 51, forms a first exhaust groove 53, a second exhaust groove 54, and a venting groove 55. The remaining first insulating member 5, namely the second separate insulating member 52, forms a second exhaust groove 54 and a venting groove 55, and the venting groove 55 on the second separate insulating member 52 passes through one end of the first insulating member 5 along the length direction of the cover plate 1 and one side of the second exhaust groove 54.
[0078] As can be seen from the structure described above, for large-capacity, large-size battery cells, the first insulating component 5 is designed as a separate part and can be injection molded individually. This ensures that the flatness of the plastic meets the requirements for larger injection molded parts, and also releases the stress on the first insulating component 5 due to heating and electrolyte immersion. This solves the problem of the first insulating component 5 being under stress and causing damage to the electrode assembly 4 due to the downward arching of the central part.
[0079] Furthermore, the high-temperature and high-pressure gas accumulated in the second exhaust groove 54 on the first split insulating component 51 and the second split insulating component 52 will be discharged into the middle first exhaust groove 53 through their respective air guide grooves 55, and then discharged to the outside of the battery cell through the explosion-proof valve 10 above the first exhaust groove 53, thus playing a role in rapid pressure relief.
[0080] It should be noted that in this embodiment, only one explosion-proof valve 10 is provided. Correspondingly, only the first exhaust groove 53 is provided on the first split insulating component 51 below the explosion-proof valve 10. When there are multiple explosion-proof valves 10, the first exhaust groove 53 needs to be provided on the corresponding split insulating component 5 below each explosion-proof valve 10, and the second exhaust groove 54 and the air guide groove 55 are also provided. For other split insulating components 5, only the second air guide groove and the air guide groove 55 need to be provided. The specific selection is based on actual needs.
[0081] In addition, it should be noted that the number of separate insulating components 5 is not limited to the two mentioned above, but can also be three, four or five, etc. Of course, the first insulating component 5 in this application may not be set separately. That is to say, this application has only one separate insulating component 5, which is provided with a first exhaust groove 53, a second exhaust groove 54 and an air guide groove 55. The specific selection is based on actual needs.
[0082] In this embodiment, preferably, as follows: Figures 8 to 10 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.
[0083] 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.
[0084] 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.
[0085] In this embodiment, preferably, as follows: Figure 8 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.
[0086] 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.
[0087] 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, and 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.
[0088] 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.
[0089] In this embodiment, preferably, as follows: Figure 8 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.
[0090] 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 its cooperation with 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, which facilitates its 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 a, but it can also be set at an angle to the first preset direction a.
[0091] 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.
[0092] In this embodiment, preferably, as follows: Figure 8 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.
[0093] 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.
[0094] In this embodiment, preferably, as follows: Figure 1 and Figure 14 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.
[0095] 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.
[0096] 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.
[0097] 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.
[0098] 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.
[0099] In this embodiment, preferably, as follows: Figure 12 As shown, along the first preset direction, a welding thinning area 23 is formed on the side of the pole post 2 away from the pole group 4, located on the outer periphery of the mounting through hole 22, and the welding thinning area 23 is correspondingly provided with the welding area 324.
[0100] 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.
[0101] 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.
[0102] In this embodiment, preferably, as follows: Figure 13 As shown, along the first preset direction a, the depth of the welding thinning zone 23 is L1, and 0.5mm. <L1<0.7mm。
[0103] 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.
[0104] In this embodiment, preferably, as follows: Figure 12 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。
[0105] 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.
[0106] In this embodiment, preferably, as follows: Figure 9 and Figure 12 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.
[0107] 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.
[0108] In this embodiment, preferably, as follows: Figure 8 , Figure 9 and Figure 12 As shown, the welding thinning zone 23 and the welding zone 324 are matching annular regions.
[0109] 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.
[0110] 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.
[0111] In this embodiment, preferably, as follows: Figure 14 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.
[0112] 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.
[0113] In this embodiment, preferably, as follows: Figure 10 As shown, along the first preset direction a, the height of the protrusion 33 is h, and 0.6mm < h < 1.2mm.
[0114] 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.
[0115] In this embodiment, preferably, as follows: Figure 13 As shown, along the first preset direction a, the depth of the mounting groove 21 is H, and 4mm. <H<5mm。
[0116] 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.
[0117] In this embodiment, preferably, as follows: Figure 8 As shown, the welding area 324 is an annular region surrounding the mounting protrusion 33 and projected along the first preset direction a.
[0118] 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.
[0119] 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.
[0120] In this embodiment, preferably, as follows: Figure 8 , Figure 11 and Figure 14 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.
[0121] In this embodiment, preferably, as follows: Figure 8 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.
[0122] In this embodiment, preferably, as follows: Figure 8 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.
[0123] In this embodiment, preferably, as follows: Figure 1 , Figure 6 and Figure 7As shown, the cover plate 1 has an injection hole 101, and the first insulating member 5 located below the injection hole 101 along the first preset direction a has a liquid-blocking groove 56 corresponding to the injection hole 101, and the side wall of the liquid-blocking groove 56 has a liquid outlet 57.
[0124] As described above, for high-space-utilization cells, to prevent the electrolyte from directly impacting the electrode core during injection, this application provides a liquid-blocking groove 56 on the first insulating member 5. The electrolyte first acts on the bottom plate of the liquid-blocking groove 56, forming a flow divider, and then flows from each liquid outlet 57 to the electrode group 4, thereby completing the injection operation. Of course, it is not limited to this; the main liquid-blocking groove 56 may not be provided below the injection hole 101, depending on the actual needs.
[0125] In this embodiment, preferably, as follows: Figure 1 and Figure 14 As shown, the battery cell with the novel assembly structure also includes a second insulating component 8 (the second insulating component 8 can be a plastic component, i.e., plastic, but is not limited to this), a welding ring 7, and a sealing ring 6. The cover plate 1 has a first through hole extending through both sides along a first predetermined direction a. The electrode post 2 is installed inside 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 welding ring 7 is fitted onto the outside of the electrode post 2 and connected to it by welding. The second insulating component 8 is wrapped around the outside of the welding ring 7 by injection molding, providing insulation and protection. It can be seen that the second insulating component 8 and the welding ring 7 form an integral, compressed insulation structure 9, which is more stable and reliable, and greatly improves production efficiency.
[0126] 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 with a novel assembly structure, characterized in that, include: The device comprises a cover plate, a first insulating component, an explosion-proof valve, an electrode post, and connecting components; wherein, along a first preset direction, the first insulating component is installed on the inner side of the cover plate near the electrode assembly; the explosion-proof valve is installed in a through hole in the cover plate; the first insulating component has a first vent groove, a second vent groove, and a vent guide groove, and along the first preset direction, the first vent groove is located below the explosion-proof valve; both the first vent groove and the second vent groove have vent holes; the second vent groove is located on the side of the first vent groove and is connected to the first vent groove through the vent guide groove; The electrode post is mounted on the cover plate, and the first insulating member has a clearance through hole to avoid the electrode post; the electrode post has a mounting groove and a mounting through hole that are sequentially arranged and connected along a first preset direction, and the mounting groove passes through the inner side of the electrode post near the electrode group, and the mounting through hole passes through the outer side of the electrode post away from the electrode group; the connecting member includes a first connecting part, a second connecting part, and a mounting protrusion that are sequentially connected, and along the first preset direction, the mounting protrusion is located on the outer side of the second connecting part away from the electrode group; The first connecting portion is located on the inner side of the first insulating member near the electrode group and is used to connect the electrode group's tab cluster; the second connecting portion 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 portion forms a welding area located outside the projection of the mounting protrusion.
2. The battery cell with a novel assembly structure according to claim 1, characterized in that, The first insulating member has a second venting groove formed at at least one end along its length.
3. The battery cell with a novel assembly structure according to claim 2, characterized in that, The air guide groove extends along the length of the first insulating member; and / or Both the first venting groove and the second venting groove extend along the width direction of the first insulating member.
4. The battery cell with a novel assembly structure according to claim 1, characterized in that, The exhaust through-hole on the first exhaust groove includes a first exhaust through-hole and a second exhaust through-hole, wherein the first exhaust through-hole is formed on the bottom wall of the first exhaust groove near the electrode group side, and the second exhaust through-hole is formed on the side wall of the first exhaust groove.
5. The battery cell with a novel assembly structure according to claim 1, characterized in that, The first insulating element includes a plurality of separate insulating elements, and the plurality of separate insulating elements are arranged sequentially at intervals along the length direction of the cover plate; wherein the separate insulating element located below the explosion-proof valve along the first preset direction forms the first exhaust groove, the second exhaust groove, and the air guide groove; the remaining first insulating elements form the second exhaust groove and the air guide groove, and the air guide groove passes through one end of the first insulating element along the length direction of the cover plate.
6. The battery cell with a novel assembly structure according to claim 1, characterized in that, The second connection portion includes a plug-in portion and a solder portion connected together; wherein, along a second preset direction perpendicular to the first preset direction, the solder 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 solder portion away from the electrode group.
7. The battery cell with a novel assembly structure according to claim 6, characterized in that, Along a third preset direction perpendicular to the first preset direction, at least one side of the insertion portion has an auxiliary heat dissipation portion extending beyond the welding portion; and / or The plug-in portion and the first connection portion are combined into an L-shaped plate-like structure; and / or The mounting projection portion, the plug-in portion, the welding portion, and the first connection portion are of an integral structure; and / or The number of the electrode groups is two, the number of the first connection portions and the plug-in portions is also two, and they respectively correspond to the two electrode groups one by one. Along the second preset direction, the two plug-in portions and the two first connection portions are symmetrically arranged on opposite sides of the welding portion respectively.
8. The battery cell with a novel assembly structure according to claim 1, characterized in that, Along the first preset direction, on the side of the electrode post背离极组 (away from the electrode group), a welding thinning area located on the outer periphery of the mounting through hole is formed, and the welding thinning area is correspondingly arranged with the welding area.
9. The battery cell with a novel assembly structure 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 projection portion falls within the projection of the second connection 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 annular areas that are adapted to each other.
10. The battery cell with a novel assembly structure according to any one of claims 1 to 9, characterized in that, Along the first preset direction, the mounting projection portion does not protrude from the electrode post, and the height difference between them is S, and 0.1mm < S < 0.2mm; and / or Along the first preset direction, the height of the mounting projection portion 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; and / or The welding area is an annular area around the projection of the mounting projection portion along the first preset direction; and / or The mounting through hole is adapted to the mounting projection portion, and the mounting groove is adapted to the second connection portion; and / or The cover plate is formed with a liquid injection hole, and along the first preset direction, the first insulating member located below the liquid injection hole is formed with a liquid blocking groove corresponding to the liquid injection hole, and a liquid distribution port is formed on the side wall of the liquid blocking groove; and / or The battery cell with the novel assembly structure further includes a second insulating member, a welding ring, and a sealing ring; wherein, the cover plate is formed with a first through hole penetrating through its two sides along the first preset direction, the electrode post is installed in the first through hole, and the sealing ring sleeve is compressed between the outer side wall of the electrode post and the hole wall of the first through hole; the welding ring is sleeved outside the electrode post and is connected to the electrode post by welding; the second insulating member is wrapped outside the welding ring by injection molding.