Battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell which comprises a pole group assembly and a side plate, wherein at least one side of the pole group assembly is provided with a side plate, and the side plate is provided with a supporting lug boss; the pole group assembly comprises a plurality of pole groups which are sequentially arranged along a preset direction, a supporting lug boss is arranged between any two adjacent pole groups so as to form an accommodating space, and the pole lug clusters of the two pole groups extend into the accommodating space. Therefore, the whole pole group is designed into a split structure, so that the length of a single pole group is reduced, that is, the length of the pole piece is reduced, the problems of wrinkles, deformation, layer channeling or breakage and the like are not easy to occur in the pole piece production and later assembly processes, the yield is improved, the cost is reduced, and in addition, the product quality is improved. And the supporting assembly is arranged between the two pole groups, so that the overall strength is improved, and the pressure resistance is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular, to an electric core. Background Art

[0002] At present, the structure of the electric core is generally short, and the overall capacity increase space is limited by process conditions. If the length of the electric core is increased to increase the capacity, the length of the electrode group will be increased accordingly. That is to say, if the length of the electrode sheet is increased, wrinkles, deformation, layer displacement or fracture and other defects are likely to occur during the production and later assembly of the electrode sheet, resulting in a decrease in the yield. Summary of the Utility Model

[0003] The purpose of this application is to provide an electric core, which solves to a certain extent the technical problem in the prior art that in order to increase the capacity, the electric core needs to be designed to be longer, which in turn increases the length of the electrode group, that is, increases the length of the electrode sheet, and wrinkles, deformation, layer displacement or fracture and other defects are likely to occur during the production and later assembly of the electrode sheet, resulting in a decrease in the yield.

[0004] This application provides an electric core, including: an electrode group assembly and side plates; wherein, at least one side of the electrode group assembly is provided with the side plates, and the side plates are formed with supporting protrusions; the electrode group assembly includes a plurality of electrode groups arranged in sequence along a preset direction, and the supporting protrusions are arranged between any two adjacent electrode groups to form a receiving space, and the ear clusters of the two electrode groups close to each other extend into the receiving space.

[0005] In the above technical solution, further, the supporting protrusion is formed with an open installation groove to form the receiving space, and the ear clusters of the two electrode groups respectively extend into the installation groove through corresponding openings.

[0006] In any of the above technical solutions, further, side plates are provided on both opposite sides of the electrode group assembly, and both of the side plates are formed with supporting protrusions, the two supporting protrusions are abutted against each other, and the two installation grooves are communicated with each other.

[0007] In any of the above technical solutions, further, the supporting protrusion is formed with a cavity with openings at both ends, the side plate is formed with a through hole, and the cavity is communicated with the through hole through the openings at its ends.

[0008] In any of the above technical solutions, further, the electric core further includes an insulating support plate, and along the preset direction, at least one end of the electrode group assembly is provided with the insulating support plate, and each insulating support plate is formed with a through port; the side plate is connected to the insulating support plate.

[0009] In any of the above technical solutions, further, one of the side plates and the insulating support plate is formed with a buckle, and the other of the side plates and the insulating support plate is formed with a clamping groove, and the buckle is clamped in the clamping groove.

[0010] In any of the above technical solutions, further, the battery cell further includes a metal cover plate, and the metal cover plate is disposed on a side of at least one of the insulating support plates away from the electrode group assembly, and the metal cover plate abuts against the insulating support plate; the metal cover plate is formed with a conductive portion protruding in a direction away from the electrode group assembly.

[0011] In any of the above technical solutions, further, the battery cell further includes a housing and an explosion-proof valve; wherein, the electrode group assembly is disposed in the housing, the explosion-proof valve is installed on the housing and is in communication with the interior of the housing; the number of the explosion-proof valves is the same as and corresponds to the number of the electrode groups one by one, and the plurality of explosion-proof valves are sequentially arranged along the preset direction.

[0012] In any of the above technical solutions, further, along the preset direction, the explosion-proof valve is disposed at an intermediate position of the corresponding electrode group.

[0013] In any of the above technical solutions, further, the explosion-proof valve is installed on the narrow side surface of the housing.

[0014] In any of the above technical solutions, further, the positive electrode ear clusters and the negative electrode ear clusters of any two adjacent electrode groups that are close to each other are lapped together and connected by welding.

[0015] In any of the above technical solutions, further, the side plate includes a plurality of wide portions and a plurality of narrow portions, and the wide portions and the narrow portions are alternately arranged.

[0016] In any of the above technical solutions, further, the side plate is disposed on at least one narrow side surface of the electrode group assembly.

[0017] In any of the above technical solutions, further, the battery cell further includes an insulating film, the insulating film is wrapped outside the electrode group assembly and the side plate, and the insulating film is formed with a through hole.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The present application provides a relatively long battery cell, thereby achieving overall capacity improvement. Moreover, the overall electrode group inside the battery cell is designed as a split structure, with support protrusions provided on the side, and the support protrusions are extended between adjacent electrode groups, such that an accommodation space is formed between two adjacent electrode groups, providing an installation space for the ear cluster. Additionally, under the support of the support protrusions, the ear cluster is prevented from being crushed, thus making it possible to realize the docking of two electrode groups.

[0020] It can be seen that the overall electrode group is designed as a split structure, thereby reducing the length of a single electrode group. That is to say, the length of the electrode sheet is reduced, and thus problems such as wrinkles, deformation, layer displacement, or breakage are not likely to occur during the production and subsequent assembly of the electrode sheet, which helps to improve the yield rate and reduce costs. In addition, a support component is provided between the two electrode groups, enhancing the overall strength and the voltage resistance performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is an exploded view of the battery cell provided by an embodiment of the present application;

[0023] Figure 2 For Figure 1 a partial enlarged structural schematic diagram;

[0024] Figure 3 It is a structural schematic diagram of a side plate provided by an embodiment of the present application;

[0025] Figure 4 For Figure 3 a partial enlarged structural schematic diagram;

[0026] Figure 5 It is another structural schematic diagram of the side plate provided by an embodiment of the present application;

[0027] Figure 6 For Figure 5 a cross-sectional view along the A-A section;

[0028] Figure 7 It is an assembly diagram of the side plate and the insulating support plate provided by an embodiment of the present application;

[0029] Figure 8 For Figure 7 a partial enlarged structural schematic diagram;

[0030] Figure 9 is Figure 7 another partial enlarged structural schematic diagram;

[0031] Figure 10 is the structural schematic diagram of the insulating support plate provided by the embodiment of the present application;

[0032] Figure 11 is the structural schematic diagram of the metal cover plate provided by the embodiment of the present application;

[0033] Figure 12 is another structural schematic diagram of the metal cover plate provided by the embodiment of the present application.

[0034] Reference numerals:

[0035] 1 - pole group assembly, 11 - pole group, 111 - positive electrode tab cluster, 112 - negative electrode tab cluster, 2 - side plate, 21 - support protrusion, 211 - installation groove, 212 - cavity, 22 - through hole, 23 - buckle, 24 - wide part, 25 - narrow part, 3 - insulating support plate, 31 - through opening, 32 - card slot, 4 - metal cover plate, 41 - conductive part, 5 - outer shell, 6 - explosion - proof valve, 7 - insulating film. Detailed implementation manners

[0036] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments.

[0037] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents the selected embodiments of the present application.

[0038] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] The following refers to Figures 1 to 12 Describe the battery cell according to some embodiments of the present application.

[0042] Refer to Figures 1 to 10 As shown, the embodiments of the present application provide a battery cell, including: a pole group assembly 1 and a side plate 2; wherein, at least one side of the pole group assembly 1 is provided with the side plate 2, and the side plate 2 is formed with a support protrusion 21; the pole group assembly 1 includes a plurality of pole groups 11 arranged in sequence along a preset direction, and a support protrusion 21 is arranged between any two adjacent pole groups 11 to form an accommodation space, and the pole ear clusters of the two pole groups 11 close to each other both extend into the accommodation space.

[0043] According to the structure described above, the present application provides a relatively long battery cell, thereby realizing overall capacity increase, and designing the overall pole group 11 inside the battery cell as a split structure, arranging support protrusions 21 on the side, and making the support protrusions 21 extend between adjacent pole groups 11, so that an accommodation space is formed between two adjacent pole groups 11, providing an installation space for the pole ear clusters, and moreover, under the support of the support protrusions 21, it is avoided to crush the pole ear clusters, thereby providing the possibility for the docking of the two pole groups 11.

[0044] It can be seen that the overall pole group 11 is designed as a split structure, thereby reducing the length of a single pole group 11, that is to say, reducing the length of the pole piece, and thus it is not easy to have problems such as wrinkles, deformation, layer displacement, or breakage during the production of the pole piece and the subsequent assembly process, which helps to improve the yield rate and helps to reduce costs. In addition, a support component is arranged between the two pole groups 11, improving the overall strength and the voltage resistance performance.

[0045] Further, preferably, at least one narrow side of the pole group assembly 1 is provided with the aforementioned side plate 2. This narrow side specifically refers to the side part with a smaller area formed by the long side and the wide side, improving the convenience of inserting the pole group assembly 1 into the shell. At the same time, the side plate 2 is not arranged on the large side of the pole group assembly 1, so it does not affect heat dissipation, improving the safety and reliability of the battery cell during use. Of course, it is not limited to this, and the side plate 2 can also be arranged on the large side of the pole group assembly 1, that is, the side part with a larger area formed by the long side and the high side.

[0046] Further, preferably, the preset direction is the same as the length direction c of the electrode group 11. Of course, it is not limited thereto.

[0047] Further, preferably, the support protrusion 21 and the side plate 2 can be integrally formed by injection molding. Of course, it is not limited thereto, and the forming method can also be selected according to actual needs.

[0048] It should be noted that: along the preset direction, the two adjacent electrode groups 11 are abutted against both sides of the support protrusion 21 therebetween, and a small gap can also be left, which is specifically selected according to actual needs.

[0049] In this embodiment, preferably, as Figure 4 、 Figure 6 and Figure 8 shown, the support protrusion 21 is formed with an open mounting groove 211 to form a receiving space. Preferably, openings are formed on three sides and the top of this mounting groove 211, and the ear clusters of the two electrode groups 11 extend into the mounting groove 211 through the corresponding openings respectively.

[0050] According to the structure described above, the mounting groove 211 serves to accommodate the ear clusters, avoid interference with the ear clusters, and thus can ensure that the ear clusters are not damaged.

[0051] In this embodiment, preferably, as Figure 8 shown, side plates 2 are provided on both opposite sides of the electrode group assembly 1, and both side plates 2 are formed with support protrusions 21. The two support protrusions 21 are abutted against each other relatively, and the two mounting grooves 211 are communicated. And preferably, along the direction perpendicular to the preset direction, that is, the height direction of the electrode group 11, the two support protrusions 21 are abutted against each other relatively. Of course, it is not limited thereto.

[0052] According to the structure described above, side plates 2 are provided on both sides of the electrode group assembly 1, and support protrusions 21 are provided on the side plates 2. The two support protrusions 21 are butted against each other. That is to say, two support protrusions 21 are provided between two adjacent electrode groups 11. The two support protrusions 21 play a role of balanced support, and the support effect is better, avoiding the problems of unbalanced support and local pressing of the ear clusters caused by setting the support protrusion 21 on one side only.

[0053] It should be noted that: it is not limited to providing side plates 2 on both opposite sides of the electrode group assembly 1, and side plates 2 can also be provided on only one side of the electrode group assembly 1, which is specifically selected according to actual needs.

[0054] In this embodiment, preferably, as Figure 6As shown, the support protrusion 21 is formed with a cavity 212 having openings at both ends, and the side plate 2 is formed with a through hole 22, and the cavity 212 is communicated with the through hole 22 via the openings at its ends.

[0055] According to the structure described above, the cavities 212 between the two support protrusions 21 are communicated with each other and with the through hole 22 on the side plate 2 to form an exhaust passage, which can accelerate the exhaust rate during thermal runaway.

[0056] In this embodiment, preferably, as Figure 7 、 Figure 9 and Figure 10 shown, the battery cell further includes an insulating support plate 3, and along a preset direction, insulating support plates 3 are provided at both ends of the electrode group assembly 1, and each insulating support plate 3 is formed with a through port 31; the side plate 2 is connected to the insulating support plate 3.

[0057] According to the structure described above, insulating support plates 3 are provided at both ends of the electrode group assembly 1 to ensure balanced thrust when the electrode group 11 is inserted into the case. Moreover, the side plate 2 is connected to the insulating support plate 3, so the overall strength is higher, the fixing and protection effects on the electrode group 11 are better, and the structure is safer.

[0058] Furthermore, preferably, the material of the insulating support plate 3 can be plastic, rubber, etc., and is specifically selected according to actual needs.

[0059] It should be noted that: it is not limited to providing insulating support plates 3 at both ends of the electrode group 11, and insulating support plates 3 can also be provided only at one end of the electrode group assembly 1 along the preset direction, and it is specifically designed according to actual needs.

[0060] In this embodiment, preferably, as Figure 9 and Figure 10 shown, the side plate 2 is formed with a buckle 23, and the insulating support plate 3 is formed with a slot 32, and the buckle 23 is snap-fitted in the slot 32.

[0061] According to the structure described above, through the snap-fitting of the buckle 23 and the slot 32, the side plate 2 and the insulating support plate 3 are assembled together, and the overall structure is more stable and firm. Moreover, a detachable connection method is adopted between the side plate 2 and the insulating support plate 3, which has repeatable operability. Of course, it is not limited to this, and a buckle 23 can also be provided on the insulating support plate 3 and a slot 32 can be provided on the side plate 2, etc.

[0062] In this embodiment, preferably, as Figure 1 、 Figure 11 and Figure 12As shown, the battery cell further includes a metal cover plate 4, and a metal cover plate 4 is disposed on a side of at least one insulating support plate 3 away from the electrode group assembly 1, and the metal cover plate 4 abuts against the insulating support plate 3; a conductive portion 41 protruding in a direction away from the electrode group assembly 1 is formed on the metal cover plate 4.

[0063] According to the structure described above, other cover plate components are cancelled, only the metal cover plate 4 is retained, and a conductive portion 41 protruding towards the outside of the battery cell is provided on the metal cover plate 4 as a power output terminal, with high space utilization rate, which helps to increase the capacity of the battery cell. Moreover, an insulating support plate 3 is disposed below the metal cover plate 4 to prevent problems such as short circuit, which is safer and more reliable.

[0064] Further, preferably, the material of the metal cover plate 4 is aluminum, that is, it can be a polished aluminum plate and is used as a positive cover plate. Of course, it is not limited thereto, and the material of the metal cover plate 4 can also be other materials and can also be used as a negative cover plate, etc.

[0065] In addition, it should be noted that when insulating support plates 3 are disposed at both ends of the electrode group assembly 1, that is, when there are two insulating support plates 3, only one of the insulating support plates 3 can be selected, and a metal cover plate 4 is disposed on its outer side, and a cover plate structure commonly used in the prior art is disposed on the outer side of the other insulating support plate 3, or the aforementioned metal cover plates 4 are disposed on the outer sides of both insulating support plates 3, which is specifically selected according to actual needs.

[0066] In this embodiment, preferably, as Figure 1 shown, the battery cell further includes a housing 5 and an explosion-proof valve 6; wherein, the electrode group assembly 1 is disposed in the housing 5, the explosion-proof valve 6 is installed on the housing 5 and is in communication with the interior of the housing 5; the number of explosion-proof valves 6 is the same as and corresponds one by one to the number of electrode groups 11, and a plurality of explosion-proof valves 6 are sequentially arranged along a preset direction.

[0067] According to the structure described above, an explosion-proof valve 6 is provided for each electrode group 11, which increases the exhaust area and helps to quickly exhaust gas during thermal runaway.

[0068] Further, preferably, the explosion-proof valve 6 is disposed on the narrow side of the housing 5, that is, the side with a smaller area composed of the long side and the high side. The explosion-proof valve 6 can avoid the main deformed large surface side of the electrode group 11, and this large surface side specifically refers to the side with a larger area composed of the long side and the high side;

[0069] Moreover, when a plurality of battery cells are arranged, generally the large surface sides of the battery cells, that is, the large surface sides of the housing 5, abut against each other, so that the explosion-proof valve 6 can be avoided from being blocked. Of course, it is not limited thereto, and the explosion-proof valve 6 can also be disposed on the large surface side of the battery cell, etc., which is specifically selected according to actual needs.

[0070] In this embodiment, preferably, asFigure 1 As shown, along the preset direction, the explosion-proof valve 6 is arranged at the middle position of the corresponding electrode group 11.

[0071] According to the structure described above, for each electrode group 11, an explosion-proof valve 6 is arranged at its middle position to ensure the uniformity of exhaust gas everywhere and avoid the problem of serious local thermal runaway.

[0072] In this embodiment, preferably, as Figure 8 shown, the positive electrode tab clusters 111 and the negative electrode tab clusters 112 of any two adjacent electrode groups 11 that are close to each other are set up together and connected by welding.

[0073] According to the structure described above, the tab clusters of the two electrode groups 11 are directly set up together, reducing the intermediate connecting parts, further reducing the internal resistance, saving the length of the tab clusters, reducing the space inside the battery cell, and the tab clusters of the two electrode groups 11 adopt a horizontal welding method, simplifying the process.

[0074] In this embodiment, preferably, as Figure 3 shown, the side plate 2 includes a plurality of wide parts 24 and a plurality of narrow parts 25, and the wide parts 24 and the narrow parts 25 are arranged alternately.

[0075] According to the structure described above, the side plate 2 is designed into a structure with alternating wide and narrow parts to increase the exhaust gap and contribute to rapid exhaust during thermal runaway. Of course, it is not limited to this. Along the length direction of the side plate 2, that is, along the preset direction, the side plate 2 can also have the same width, which is specifically designed according to actual needs.

[0076] In this embodiment, preferably, the battery cell further includes an insulating film 7 (not shown in the figure). The insulating film 7 wraps the outside of the electrode group assembly 1 and the side plate 2, and the insulating film 7 is formed with a through hole, which is for normal exhaust during thermal runaway and can be arranged corresponding to the explosion-proof valve 6.

[0077] According to the structure described above, after wrapping the electrode group 11 and the side plate 2 together with the insulating film 7 and then putting them into the shell, it is more convenient for operation, improves production efficiency, and the insulating film 7 also plays an insulating and protective role.

[0078] Furthermore, preferably, the insulating film 7 can be an existing mylar film. Of course, it is not limited to this, and it can also be selected according to actual needs.

[0079] Furthermore, preferably, along the preset direction, both ends of the insulating film 7 are open, playing a role of avoidance.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that, Comprising: a pole group assembly and side plates; wherein, at least one side of the pole group assembly is provided with the side plates, and the side plates are formed with support protrusions; the pole group assembly includes a plurality of pole groups sequentially arranged along a preset direction, and the support protrusions are arranged between any two adjacent pole groups to form an accommodation space, and the pole ear clusters of the two pole groups close to each other extend into the accommodation space.

2. The battery cell according to claim 1, characterized in that, The support protrusion is formed with an open mounting groove to form the accommodation space, and the pole ear clusters of the two pole groups respectively extend into the mounting groove through corresponding openings.

3. The battery cell according to claim 2, characterized in that, The side plates are provided on both opposite sides of the pole group assembly, and both of the two side plates are formed with support protrusions, the two support protrusions are abutted against each other, and the two mounting grooves are communicated with each other.

4. The battery cell according to claim 2, wherein, The support protrusion is formed with a cavity with openings at both ends, the side plate is formed with a through hole, and the cavity is communicated with the through hole through the opening at its end.

5. The battery cell according to claim 1, characterized in that The battery cell further includes an insulating support plate, and along the preset direction, at least one end of the pole group assembly is provided with the insulating support plate, and each insulating support plate is formed with a through port; the side plate is connected to the insulating support plate.

6. The battery cell according to claim 5, characterized in that, One of the side plate and the insulating support plate is formed with a buckle, and the other of the side plate and the insulating support plate is formed with a clamping groove, and the buckle is clamped in the clamping groove.

7. The battery cell according to claim 5, characterized in that, The battery cell further includes a metal cover plate, and the metal cover plate is provided on one side of at least one insulating support plate away from the pole group assembly, and the metal cover plate abuts against the insulating support plate; the metal cover plate is formed with a conductive part protruding in a direction away from the pole group assembly.

8. The battery cell according to claim 1, wherein The battery cell further includes a housing and an explosion-proof valve; wherein, the pole group assembly is arranged in the housing, the explosion-proof valve is installed on the housing and is communicated with the inside of the housing; the number of the explosion-proof valves is the same as and corresponds one by one to the number of the pole groups, and the plurality of explosion-proof valves are sequentially arranged along the preset direction.

9. The cell according to claim 8, wherein Along the preset direction, the explosion-proof valve is arranged at the middle position of the corresponding pole group; and / or The explosion-proof valve is installed on the narrow side of the housing.

10. The cell according to any one of claims 1 to 9, characterized in that, The positive pole ear clusters and the negative pole ear clusters of any two adjacent pole groups are lapped together and connected by welding; and / or The side plate includes a plurality of wide parts and a plurality of narrow parts, and the wide parts and the narrow parts are arranged alternately; and / or The side plate is provided on at least one narrow side of the pole group assembly; and / or The battery cell further includes an insulating film, the insulating film wraps the outside of the pole group assembly and the side plates, and the insulating film is formed with through holes.

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