Single battery

Abstract

The utility model relates to the technical field of batteries, in particular to a single battery which comprises a shell and a cover plate, wherein the cover plate is mounted at the opening end of the shell; the shell is made of an insulating material; the cover plate comprises a positive electrode split conductive part, an insulating part and a negative electrode split conductive part, and the positive electrode split conductive part, the insulating part and the negative electrode split conductive part are sequentially connected in the first preset direction. According to the novel single battery provided by the invention, the insulation structure is arranged between the positive electrode and the negative electrode, and is matched with the insulation shell structure, so that the positive electrode and the negative electrode are independently led out without short circuit, and compared with a traditional top cover structure, parts such as upper plastic, lower plastic, a sealing ring and a riveting block can be omitted, so that the occupied space is reduced; the capacity of the battery is greatly improved, and the high space utilization rate is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a single cell battery. Background Art

[0002] Currently, in terms of structure, single cell batteries all pursue high space utilization rate to improve the energy density of single cell batteries, that is, to increase the capacity. However, the current cover plate structure of single cell batteries includes structures such as a cover sheet, an upper plastic, a lower plastic, a pole column, a riveting block, and a sealing ring, which occupy a large amount of space and are not conducive to increasing the capacity of single cell batteries. It can be seen that how to achieve high space utilization rate of single cell batteries to increase the capacity is still an urgent problem for developers in the industry. Summary of the Utility Model

[0003] The purpose of the present application is to provide a single cell battery, which to a certain extent solves the technical problem in the prior art that the cover plate structure of the single cell battery occupies a large amount of space, has a small space utilization rate, and is not conducive to increasing the capacity of the single cell battery.

[0004] The present application provides a single cell battery, including a housing and a cover plate; wherein, the cover plate is installed at the open end of the housing; the housing is made of an insulating material; the cover plate includes a positive electrode split conductive part, an insulating part, and a negative electrode split conductive part, and along a first preset direction, the positive electrode split conductive part, the insulating part, and the negative electrode split conductive part are sequentially connected.

[0005] In the above technical solution, further, along a second preset direction, a first drainage boss is formed on the side of the positive electrode split conductive part facing away from the electrode core.

[0006] In any of the above technical solutions, further, the first drainage boss is formed with a first welding boss protruding toward the side facing away from the electrode core.

[0007] In any of the above technical solutions, further, along the second preset direction, the height by which the first welding boss protrudes from the first drainage boss is H1, and 0.3 mm < H1 < 0.5 mm.

[0008] In any of the above technical solutions, further, along the second preset direction, a first tab receiving groove is formed on the side of the positive electrode split conductive part close to the electrode core, and the first tab receiving groove corresponds to the first drainage boss.

[0009] In any of the above technical solutions, further, along the second preset direction, the surface of the first drainage boss facing away from the electrode core is provided with a first transverse heat dissipation groove and / or a first longitudinal heat dissipation groove.

[0010] In any of the above technical solutions, further, along the second preset direction, the depth of the first transverse heat dissipation groove and / or the first longitudinal heat dissipation groove is W1, and 0.1 mm < W1 < 0.2 mm.

[0011] In any of the above technical solutions, further, along the second preset direction, a first insulating isolation convex portion is formed on one side of the positive electrode split conductive portion close to the electrode core.

[0012] In any of the above technical solutions, further, along the second preset direction, the height of the first insulating isolation convex portion is L1, and 0.5 mm < L1 < 0.8 mm.

[0013] In any of the above technical solutions, further, along the second preset direction, a second drainage boss is formed on one side of the negative electrode split conductive portion facing away from the electrode core.

[0014] In any of the above technical solutions, further, the second drainage boss is formed with a second welding boss protruding toward the side facing away from the electrode core.

[0015] In any of the above technical solutions, further, along the second preset direction, the height by which the second welding boss protrudes from the second drainage boss is H2, and 0.3 mm < H2 < 0.5 mm.

[0016] In any of the above technical solutions, further, along the second preset direction, a second tab receiving groove is formed on one side of the negative electrode split conductive portion close to the electrode core, and the second tab receiving groove corresponds to the second drainage boss.

[0017] In any of the above technical solutions, further, along the second preset direction, a second transverse heat dissipation groove and / or a second longitudinal heat dissipation groove is provided on the surface of the second drainage boss facing away from the electrode core.

[0018] In any of the above technical solutions, further, along the second preset direction, the depth of the second transverse heat dissipation groove and / or the second longitudinal heat dissipation groove is W2, and 0.1 mm < W2 < 0.2 mm.

[0019] In any of the above technical solutions, further, along the second preset direction, a second insulating isolation convex portion is formed on one side of the negative electrode split conductive portion close to the electrode core.

[0020] In any of the above technical solutions, further, along the second preset direction, the height of the second insulating isolation convex portion is L2, and 0.5 mm < L2 < 0.8 mm.

[0021] In any of the above technical solutions, further, one of the positive electrode split conductive parts and the negative electrode split conductive parts is formed with a liquid injection hole, and the other is formed with an explosion-proof valve mounting hole, or one of the two simultaneously forms a liquid injection hole and an explosion-proof valve mounting hole.

[0022] In any of the above technical solutions, further, the positive electrode split conductive part and the negative electrode split conductive part are respectively connected to the insulating part by nano-injection molding or welding process.

[0023] In any of the above technical solutions, further, the material of the housing is PP or PVC.

[0024] In any of the above technical solutions, further, the material of the insulating part is resin.

[0025] In any of the above technical solutions, further, the material of the positive electrode split conductive part is aluminum, and the material of the negative electrode split conductive part is aluminum or copper.

[0026] Compared with the prior art, the beneficial effects of the present application are as follows:

[0027] The present application provides a new type of single cell, which adopts a new cover plate structure. Preferably, the cover plate is composed of three parts: a positive electrode split conductive part, an insulating part, and a negative electrode split conductive part. The positive electrode split conductive part and the negative electrode split conductive part are separated by the middle insulating part, and cooperate with the insulating housing, so that the positive and negative electrodes can be separately led out without short circuit.

[0028] It can be seen that an insulating structure is interposed between the positive and negative electrodes, and in cooperation with the insulating housing structure, the positive and negative electrodes can be separately led out without short circuit. Compared with the traditional top cover structure, components such as upper plastic, lower plastic, sealing ring, and riveting block can be omitted, reducing the occupied space, greatly improving the battery capacity, and achieving high space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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 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 be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic structural diagram of the single cell provided by the embodiment of the present application;

[0031] Figure 2 It is an exploded view of the cover plate provided by the embodiment of the present application;

[0032] Figure 3 Schematic diagram of the structure of the cover plate provided by the embodiment of the present application;

[0033] Figure 4 is Figure 3 Enlarged schematic diagram of the structure at A;

[0034] Figure 5 is Figure 3 Enlarged schematic diagram of the structure at B;

[0035] Figure 6 Another schematic diagram of the structure of the cover plate provided by the embodiment of the present application;

[0036] Figure 7 Cross-sectional view of the cover plate provided by the embodiment of the present application;

[0037] Figure 8 Another schematic diagram of the structure of the single battery provided by the embodiment of the present application;

[0038] Figure 9 is Figure 8 Cross-sectional view along the C-C section.

[0039] Reference numerals:

[0040] 1 - housing, 2 - cover plate, 21 - positive electrode split conductive part, 211 - first drainage boss, 212 - first welding boss, 213 - first tab receiving groove, 214 - first transverse heat dissipation groove, 215 - first longitudinal heat dissipation groove, 216 - first insulating isolation protrusion, 22 - insulating part, 23 - negative electrode split conductive part, 231 - second drainage boss, 232 - second welding boss, 233 - second tab receiving groove, 234 - second transverse heat dissipation groove, 235 - second longitudinal heat dissipation groove, 236 - second insulating isolation protrusion, 24 - liquid injection hole, 25 - explosion-proof valve mounting hole, 3 - electrode core, 31 - positive electrode tab cluster. Detailed implementation manners

[0041] 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 some, but not all, of the embodiments of the present application.

[0042] The components of the embodiments of the present application generally described and shown in the drawings herein 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 present application claimed, but merely represents selected embodiments of the present application.

[0043] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0044] 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. It 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 should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0045] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. 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.

[0046] Next, refer to Figures 1 to 9 to describe a single cell according to some embodiments of the present application.

[0047] Refer to Figures 1 to 3 As shown, an embodiment of the present application provides a single cell, including a housing 1 and a cover plate 2; wherein, the cover plate 2 is installed at the opening end of the housing 1; the material of the housing 1 is an insulating material; the cover plate 2 includes a positive electrode split conductive part 21, an insulating part 22, and a negative electrode split conductive part 23, and along a first preset direction a, the positive electrode split conductive part 21, the insulating part 22, and the negative electrode split conductive part 23 are sequentially connected.

[0048] According to the structure described above, the present application provides a new type of single cell, which adopts a new structure of the cover plate 2. Preferably, the cover plate 2 is composed of three parts: a positive electrode split conductive part 21, an insulating part 22, and a negative electrode split conductive part 23. The positive electrode split conductive part 21 and the negative electrode split conductive part 23 are separated by the intermediate insulating part 22, and in cooperation with the insulating housing 1, the positive and negative electrodes can be separately led out without short circuit.

[0049] It can be seen that an insulating structure is interposed between the positive and negative electrodes, and in cooperation with the insulating housing structure, the positive and negative electrodes can be separately led out without short circuit. Compared with the traditional top cover structure, components such as upper plastic, lower plastic, sealing ring, and riveting block can be omitted, reducing the occupied space, greatly improving the capacity of the battery, and achieving high space utilization.

[0050] Further, preferably, along the second preset direction b described below, one end of the housing 1 is formed with an opening, that is, an open end, and the number of the cover plates 2 is one, and it is installed at this open end. Of course, it is not limited to this.

[0051] In this embodiment, preferably, as Figure 3 and Figure 4 shown, along the second preset direction b, a first drainage boss 211 is formed on the side of the positive electrode split conductive part 21 facing away from the pole core 3.

[0052] According to the structure described above, the first drainage boss 211 is used as the positive electrode output end.

[0053] Further, preferably, as Figure 3 and Figure 4 shown, the first drainage boss 211 is formed with a first welding boss 212 protruding toward the side facing away from the pole core 3. The first welding boss 212 on the first drainage boss 211 is welded to the palladium sheet to output electric energy. And preferably, the palladium sheet can be sleeved outside the first welding boss 212 through a through hole to play a positioning role. Of course, it is not limited to this. The palladium sheet can also be placed flat on the first welding boss 212, and is specifically selected according to actual needs. In addition, the foregoing first welding boss 212 may not be provided, but the palladium sheet is directly placed on the first drainage boss 211 and then welded, and is specifically selected according to actual needs.

[0054] Further, preferably, the first drainage boss 211 is a square boss, which has a sufficient area, strong overcurrent capacity, and a regular shape, which is convenient for processing and manufacturing. Of course, the structure of the first drainage boss 211 is not limited to the above, and can also be designed according to actual needs.

[0055] In this embodiment, preferably, as Figure 7 shown, along the second preset direction b, the height of the foregoing first welding boss 212 protruding from the first drainage boss 211 is H1, and 0.3 mm < H1 < 0.5 mm.

[0056] According to the structure described above, if the first welding boss 212 is too high, it will occupy the space of the entire battery pack and is not conducive to increasing the capacity of the whole pack. If the first welding boss 212 is too short, it is not convenient for welding with the palladium sheet. Therefore, it is more appropriate for the first welding boss 212 to take a value between 0.3 mm and 0.5 mm, which is not only convenient for welding with the palladium sheet, but also helps to increase the capacity of the whole pack.

[0057] In this embodiment, preferably, as Figure 6 shown, along the second preset direction b, a first tab receiving groove 213 is formed on the side of the positive electrode split conductive part 21 close to the pole core 3, and the first tab receiving groove 213 corresponds to the first drainage boss 211.

[0058] According to the structure described above, the first tab accommodating groove 213 is used to accommodate the tab and can limit the tab, playing a role in assembly positioning, facilitating the welding with the positive tab cluster 31 of the electrode core 3, and helping to improve production efficiency. Of course, the above-mentioned first drainage boss 211 may not be provided, and specific selection is based on actual needs.

[0059] Furthermore, preferably, the aforementioned first drainage boss 211 and the first tab accommodating groove 213 can be integrally formed by stamping. Of course, this is not limited thereto.

[0060] Furthermore, preferably, as Figure 8 and Figure 9 shown, the number of electrode cores 3 is two, and they are arranged in parallel side by side along the width direction of the cover plate 2. The positive tab clusters 31 of the two electrode cores 3 both extend into the first tab accommodating groove 213 and are welded to the positive electrode split conductive part 21 together. Of course, the number of electrode cores 3 is not limited to two, and can also be one or more than two, such as three or four, etc. The specific arrangement method refers to the arrangement of the aforementioned two electrode cores 3.

[0061] In this embodiment, preferably, as Figure 4 shown, along the second preset direction b, on the surface of the first drainage boss 211 facing away from the electrode core 3, a first transverse heat dissipation groove 214 and a first longitudinal heat dissipation groove 215 are provided.

[0062] According to the structure described above, the first transverse heat dissipation groove 214 and the first longitudinal heat dissipation groove 215 are intertwined into a lattice-shaped groove, which can better accelerate heat dissipation and help ensure the working performance of the single cell.

[0063] Furthermore, preferably, the first transverse heat dissipation groove 214 extends along the length direction of the cover plate 2. Of course, this is not limited thereto.

[0064] Furthermore, preferably, the number of the first transverse heat dissipation grooves 214 is multiple. Of course, this is not limited thereto, and the number of the first longitudinal heat dissipation grooves 215 can also be one.

[0065] Furthermore, preferably, the first longitudinal heat dissipation groove 215 extends along the width direction of the cover plate 2. Of course, this is not limited thereto.

[0066] Furthermore, preferably, the number of the first longitudinal heat dissipation grooves 215 is multiple. Of course, this is not limited thereto, and the number of the first longitudinal heat dissipation grooves 215 can also be one.

[0067] It should be noted that: not limited to the case where the first transverse heat dissipation groove 214 and the first longitudinal heat dissipation groove 215 exist simultaneously as described above, the following structure can also be adopted. For example: along the second preset direction b, only the first transverse heat dissipation groove 214 or only the first longitudinal heat dissipation groove 215 is provided on the surface of the first drainage boss 211 facing away from the pole core 3, both of which can play a role in heat dissipation, and can be specifically selected according to actual needs.

[0068] In this embodiment, preferably, along the second preset direction b, the depths of both the first transverse heat dissipation groove 214 and the first longitudinal heat dissipation groove 215 are W1, and 0.1 mm < W1 < 0.2 mm (W1 is not shown in the figure).

[0069] According to the structure described above, if the first transverse heat dissipation groove 214 and the first longitudinal heat dissipation groove 215 are too deep, the strength will be affected; if they are too shallow, the heat dissipation effect will be poor. Therefore, the depth W1 of the first transverse heat dissipation groove 214 and the first longitudinal heat dissipation groove 215 is set within the range of 0.1 mm - 0.2 mm, which can avoid interference with other structural parts while ensuring the heat dissipation effect.

[0070] In this embodiment, preferably, as Figure 6 shown, along the second preset direction b, a first insulating isolation protrusion 216 is formed on the side of the positive electrode split conductive part 21 close to the pole core 3.

[0071] According to the structure described above, the first insulating isolation protrusion 216 mainly serves to separate the internal pole core 3 from the positive electrode split conductive part 21 on the cover plate 2, avoiding the connection between the positive electrode split conductive part 21 and the negative electrode split conductive part 23 through the pole core 3 to form a short circuit.

[0072] Furthermore, preferably, the first insulating isolation protrusion 216 is provided on the side of the positive electrode split conductive part 21 away from the insulating part 22, that is, the first insulating isolation protrusion 216 is provided close to the wide side of the cover plate 2, which can avoid interference with the pole ear of the pole core 3 and can provide a better supporting effect on the overall cover plate 2.

[0073] Furthermore, preferably, the first insulating isolation protrusion 216 is in the shape of a cuboid, its length direction is the same as the width direction of the cover plate 2, and its width direction is the same as the length direction of the cover plate 2.

[0074] It should be noted that: both the shape and position of the first insulating isolation protrusion 216 are not limited to the above, and can also be designed according to actual needs. For example: regarding the shape, the first insulating isolation protrusion 216 can also be circular, etc.; regarding the position, the first insulating isolation protrusion 216 can also be provided close to the long side of the cover plate 2, etc.

[0075] In this embodiment, preferably, as Figure 7 shown, along the second preset direction b, the height of the first insulating and isolating convex portion 216 is L1, and 0.5 mm < L1 < 0.8 mm.

[0076] According to the structure described above, if the first insulating and isolating convex portion 216 is too high, it will occupy a large space and is not conducive to increasing the capacity of the single battery. If the first insulating and isolating convex portion 216 is too short, it will not play the role of insulating and isolating. Therefore, the height L1 of the first insulating and isolating convex portion 216 is set within the range of 0.5 mm - 0.8 mm, which occupies a small space, is conducive to increasing the capacity of the single battery, and can achieve a good insulating effect.

[0077] In this embodiment, preferably, as Figure 3 and Figure 5 shown, along the second preset direction b, a second drainage boss 231 is formed on the side of the negative electrode split conductive portion 23 facing away from the electrode core 3.

[0078] According to the structure described above, the second drainage boss 231 can be welded to an external palladium sheet and used as the negative electrode output terminal.

[0079] Furthermore, preferably, as Figure 3 and Figure 5 shown, the second drainage boss 231 is formed with a second welding boss 232 protruding toward the side facing away from the electrode core 3. The second welding boss 232 on the second drainage boss 231 is welded to the palladium sheet to output electric energy. Preferably, the palladium sheet can be sleeved outside the second welding boss 232 through a through hole to play a positioning role. Of course, it is not limited to this. The palladium sheet can also be placed flat on the second welding boss 232, which is specifically selected according to actual needs. In addition, the foregoing second welding boss 232 may not be provided, but the palladium sheet is directly placed on the second drainage boss 231 and then welded, which is specifically selected according to actual needs.

[0080] Furthermore, preferably, the second drainage boss 231 is a square boss, which has a sufficient area, strong current-carrying capacity, and a regular shape, facilitating processing and manufacturing. Of course, the structure of the second drainage boss 231 is not limited to the above, and can also be designed according to actual needs.

[0081] In this embodiment, preferably, as Figure 7 shown, along the second preset direction b, the height by which the second welding boss 232 protrudes from the second drainage boss 231 is H2, and 0.3 mm < H2 < 0.5 mm (specifically, reference can be made to H1).

[0082] According to the structure described above, if the second welding boss 232 is too high, it will occupy the space of the entire battery pack, which is not conducive to increasing the capacity of the whole pack. If the second welding boss 232 is too short, it is not convenient for welding with the palladium sheet. Therefore, it is more appropriate that the second welding boss 232 has a value between 0.3 mm and 0.5 mm, which is not only convenient for welding with the palladium sheet but also helps to increase the capacity of the whole pack.

[0083] In this embodiment, preferably, as Figure 6 shown, along the second preset direction b, a second ear receiving groove 233 is formed on the side of the negative electrode split conductive part 23 close to the electrode core 3, and the second ear receiving groove 233 corresponds to the second drainage boss 231.

[0084] According to the structure described above, the second ear receiving groove 233 is used to receive the negative ear cluster of the electrode core 3, and can limit the ears, playing a role in assembly positioning, facilitating the welding with the positive ear cluster 31 of the electrode core 3, and helping to improve production efficiency. Of course, the above-mentioned second drainage boss 231 may not be provided, and it can be specifically selected according to actual needs.

[0085] Furthermore, preferably, the aforementioned second drainage boss 231 and the second ear receiving groove 233 can be integrally formed by stamping. Of course, this is not the only way.

[0086] Furthermore, preferably, as Figure 8 and Figure 9 shown, the number of electrode cores 3 is two, and they are arranged side by side and parallel along the width direction of the cover plate 2, and the negative ear clusters of the two electrode cores 3 both extend into the second ear receiving groove 233 and are both welded to the negative electrode split conductive part 23. Of course, the number of electrode cores 3 is not limited to two, and can also be one or more than two, such as three or four, etc. The specific arrangement method refers to the arrangement of the aforementioned two electrode cores 3.

[0087] In this embodiment, preferably, as Figure 3 and Figure 5 shown, along the second preset direction b, a second transverse heat dissipation groove 234 and a second longitudinal heat dissipation groove 235 are provided on the surface of the second drainage boss 231 facing away from the electrode core 3.

[0088] According to the structure described above, the second transverse heat dissipation groove 234 and the second longitudinal heat dissipation groove 235 are intertwined into a lattice-shaped groove, which can better accelerate heat dissipation and help ensure the working performance of the single battery.

[0089] Furthermore, preferably, the second transverse heat dissipation groove 234 extends along the length direction of the cover plate 2. Of course, this is not the only way.

[0090] Further, preferably, the number of the second transverse heat dissipation grooves 234 is multiple. Of course, it is not limited thereto, and the number of the second longitudinal heat dissipation grooves 235 can also be one.

[0091] Further, preferably, the second longitudinal heat dissipation grooves 235 extend along the width direction of the cover plate 2. Of course, it is not limited thereto.

[0092] Further, preferably, the number of the second longitudinal heat dissipation grooves 235 is multiple. Of course, it is not limited thereto, and the number of the second longitudinal heat dissipation grooves 235 can also be one.

[0093] It should be noted that: it is not limited to the case where the second transverse heat dissipation grooves 234 and the second longitudinal heat dissipation grooves 235 exist simultaneously as described above. The following structure can also be adopted. For example: along the second preset direction b, only the second transverse heat dissipation grooves 234 or only the second longitudinal heat dissipation grooves 235 are provided on the surface of the first drainage boss 211 facing away from the pole core 3, and both can play a role in heat dissipation, and specific selection is made according to actual needs.

[0094] In this embodiment, preferably, along the second preset direction b, the depths of both the second transverse heat dissipation grooves 234 and the second longitudinal heat dissipation grooves 235 are W2, and 0.1 mm < W2 < 0.2 mm (W2 is not shown in the figure).

[0095] According to the structure described above, if the second transverse heat dissipation grooves 234 and the second longitudinal heat dissipation grooves 235 are too deep, the strength will be affected; if they are too shallow, the heat dissipation effect will be poor. Therefore, the depth W2 of the second transverse heat dissipation grooves 234 and the second longitudinal heat dissipation grooves 235 is set within the range of 0.1 mm - 0.2 mm, which can avoid interference with other structural parts while ensuring the heat dissipation effect.

[0096] In this embodiment, preferably, as Figure 6 shown, along the second preset direction b, a second insulating isolation protrusion 236 is formed on the side of the negative electrode split conductive part 23 close to the pole core 3.

[0097] According to the structure described above, the second insulating isolation protrusion 236 mainly serves to separate the internal pole core 3 from the negative electrode split conductive part 23 on the cover plate 2, and prevent the positive electrode split conductive part 21 and the negative electrode split conductive part 23 from being connected through the pole core 3 to form a short circuit.

[0098] Further, preferably, the second insulating isolation protrusion 236 is provided on the side of the positive electrode split conductive part 21 away from the insulating part 22, that is, the second insulating isolation protrusion 236 is provided close to the wide side of the cover plate 2, which can avoid interference with the pole ear of the pole core 3 and can also provide a good supporting effect on the overall cover plate 2.

[0099] Further, preferably, the first insulating and isolating protrusion 216 is in the shape of a cuboid, the length direction thereof is the same as the width direction of the cover plate 2, and the width direction thereof is the same as the length direction of the cover plate 2.

[0100] It should be noted that: the shape and position of the second insulating and isolating protrusion 236 are not limited to the above, and can also be designed according to actual needs. For example, in terms of the shape, the second insulating and isolating protrusion 236 can also be circular, etc.; in terms of the position, the second insulating and isolating protrusion 236 can also be arranged close to the long side of the cover plate 2, etc.

[0101] In this embodiment, preferably, as Figure 7 shown, along the second preset direction b, the height of the second insulating and isolating protrusion 236 is L2, and 0.5 mm < L2 < 0.8 mm.

[0102] According to the structure described above, if the second insulating and isolating protrusion 236 is too high, it will occupy a large space and is not conducive to increasing the capacity of the single cell. If the second insulating and isolating protrusion 236 is too short, it will not play the role of insulating and isolating. Therefore, the height L2 of the second insulating and isolating protrusion 236 is set within the range of 0.5 mm - 0.8 mm, which occupies a small space, is conducive to increasing the capacity of the single cell, and can achieve a good insulating effect.

[0103] In this embodiment, preferably, as Figure 3 shown, the positive electrode split conductive part 21 is formed with a liquid injection hole 24, and the negative electrode split conductive part 23 is formed with an explosion-proof valve mounting hole 25.

[0104] According to the structure described above, the liquid injection hole 24 and the explosion-proof valve mounting hole 25 are opened in different regions of the cover plate 2, making full use of the space on the cover plate 2 and not interfering with each other.

[0105] Further, preferably, the liquid injection hole 24 is formed on the side of the positive electrode split conductive part 21 away from the insulating part 22; the explosion-proof valve mounting hole 25 is formed on the side of the negative electrode split conductive part 23 away from the insulating part 22. Of course, it is not limited to the above, and can also be designed according to actual needs.

[0106] It should be noted that: it is not limited to the structure of arranging the liquid injection hole 24 on the positive electrode split conductive part 21 and the explosion-proof valve mounting hole 25 on the negative electrode split conductive part 23. It is also possible to arrange the liquid injection hole 24 on the negative electrode split conductive part 23 and the explosion-proof valve mounting hole 25 on the positive electrode split conductive part 21, or arrange the liquid injection hole 24 and the explosion-proof valve mounting hole 25 on the positive electrode split conductive part 21 or the negative electrode split conductive part 23 at the same time, which is specifically designed according to actual needs.

[0107] In this embodiment, preferably, the positive electrode split conductive part 21 and the negative electrode split conductive part 23 are respectively connected to the insulating part 22 through a nano-injection molding or welding process.

[0108] According to the structure described above, the method of integrally forming by nano-injection molding is simple and convenient to operate, and the strength of the connection part is high.

[0109] It should be noted that: it is not limited to the above connection method, and other connection methods can also be adopted. For example, the positive electrode split conductive part 21 and the negative electrode split conductive part 23 can also be respectively connected to the insulating part 22 through a welding process.

[0110] In this embodiment, preferably, the material of the housing 1 can be PP, that is, polypropylene, or PVC, that is, polyvinyl chloride, both of which have good insulation characteristics and excellent comprehensive performance. Of course, the material of the housing 1 is not limited to the above.

[0111] In this embodiment, preferably, the material of the insulating part 22 is resin, which can not only play an insulating role, but also has sufficient strength to meet the use requirements of the cover plate 2. Of course, the material of the insulating part 22 is not limited to the above.

[0112] In this embodiment, preferably, the material of the positive electrode split conductive part 21 is aluminum, and the material of the negative electrode split conductive part 23 is aluminum or copper.

[0113] According to the structure described above, when the materials of both the positive electrode split conductive part 21 and the negative electrode split conductive part 23 are aluminum, then this single cell can be used as a sodium battery. When the material of the positive electrode split conductive part 21 is aluminum and the material of the negative electrode split conductive part 23 is copper, then this single cell can be used as a lithium battery. It can be seen that the applicable range of the single cell provided by this application is wider.

[0114] Of course, the materials of both the positive electrode split conductive part 21 and the negative electrode split conductive part 23 are not limited to the above, and can also be selected according to actual needs.

[0115] It should be noted that: in this embodiment, the first preset direction a can be the length direction of the cover plate 2, and the second preset direction b can be the thickness direction of the cover plate 2, that is, the direction from the inner side of the cover plate 2 close to the electrode core 3 to the outer side of the cover plate 2 away from the electrode core 3. Of course, it is not limited to this.

[0116] 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 cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell, characterized in that, It includes a shell and a cover plate; wherein the cover plate is installed at the open end of the shell; the shell is made of insulating material; the cover plate includes a positive electrode split conductive part, an insulating part and a negative electrode split conductive part, and along a first preset direction, the positive electrode split conductive part, the insulating part and the negative electrode split conductive part are connected in sequence.

2. The single cell according to claim 1, characterized in that, Along the second preset direction, a first drainage boss is formed on the side of the positive electrode split conductive portion away from the electrode core.

3. The single cell according to claim 2, characterized in that, The first drainage boss is formed with a first welding boss that protrudes toward a side away from the pole core.

4. The single cell according to claim 3, characterized in that, Along the second preset direction, the height of the first welding boss protruding from the first drainage boss is H1, and 0.3 mm<H1<0.5 mm.

5. The single cell according to claim 2, wherein Along the second preset direction, a first pole tab accommodating groove is formed on one side of the positive electrode split conductive portion close to the pole core, and the first pole tab accommodating groove corresponds to the first drainage boss.

6. The single cell according to claim 2, characterized in that, Along the second preset direction, a first transverse heat dissipation groove and / or a first longitudinal heat dissipation groove are provided on a surface of the first drainage boss facing away from the pole core; Along the second preset direction, a depth of the first transverse heat dissipation groove and / or the first longitudinal heat dissipation groove is W1, and 0.1 mm<W1<0.2 mm.

7. The single cell according to claim 1, characterized in that, Along the second preset direction, a first insulating and isolating protrusion is formed on one side of the positive electrode split conductive portion close to the electrode core; Along the second preset direction, the height of the first insulating isolation protrusion is L1, and 0.5 mm<L1<0.8 mm.

8. The single cell according to claim 1, characterized in that, Along the second preset direction, a second drainage boss is formed on the side of the negative electrode split conductive portion away from the electrode core.

9. The single cell according to claim 8, characterized in that, The second drainage boss is formed with a second welding boss that protrudes toward a side away from the pole core.

10. The single cell according to claim 9, characterized in that, Along the second preset direction, the height of the second welding boss protruding from the second drainage boss is H2, and 0.3mm<H2<0.5mm.

11. The single cell according to claim 8, wherein Along the second preset direction, a second pole tab accommodating groove is formed on one side of the negative electrode split conductive portion close to the pole core, and the second pole tab accommodating groove corresponds to the second drainage boss.

12. The single cell according to claim 8, characterized in that, Along the second preset direction, a second transverse heat dissipation groove and / or a second longitudinal heat dissipation groove is provided on a surface of the second guide boss facing away from the pole core; Along the second preset direction, the depth of the second transverse heat dissipation groove and / or the second longitudinal heat dissipation groove is W2, and 0.1 mm<W2<0.2 mm.

13. The single cell according to claim 1, wherein Along the second preset direction, a second insulating and isolating protrusion is formed on one side of the negative electrode split conductive part close to the electrode core; Along the second preset direction, the height of the second insulating isolation protrusion is L2, and 0.5 mm<L2<0.8 mm.

14. The single cell according to any one of claims 1 to 13, characterized in that, One of the positive electrode split conductive part and the negative electrode split conductive part is formed with a liquid injection hole, and the other is formed with an explosion-proof valve installation hole, or one of the two is formed with both a liquid injection hole and an explosion-proof valve installation hole; and / or The positive electrode split conductive part and the negative electrode split conductive part are respectively connected to the insulating part by nano injection molding or welding process; and / or The shell is made of PP or PVC; and / or The material of the insulating part is resin; and / or The material of the positive split conductive part is aluminum, and the material of the negative split conductive part is aluminum or copper.

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