Battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell which comprises a plurality of pole groups and supporting assemblies, the pole groups are sequentially arranged along a first preset direction, and the supporting assemblies are arranged between any two adjacent pole groups to form an accommodating space of the two pole groups; and the tab clusters of the two pole groups extend to the accommodating space. The utility model provides a longer battery cell, which is beneficial to overall capacity improvement, the overall pole groups in the battery cell are designed into a split structure, and the supporting assemblies are arranged between the adjacent pole groups, so that the accommodating space is formed between the two pole groups to play a role in avoiding a tab cluster, thereby providing possibility for realizing butt joint of the two pole groups, being visible, and improving the capacity of the battery cell. The whole pole group is designed to be of a split structure, so that the length of a single pole group is reduced, the length of the pole piece is reduced, the pole piece is not prone to wrinkling, deforming, channeling or breaking, the yield is improved, and the cost is reduced.

Description

Technical Field

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

[0002] The existing electric core structure 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 increase 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 to a certain extent solves the technical problem in the prior art that in order to increase the capacity, the electric core needs to be designed 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 and a support assembly; wherein, the number of the electrode groups is multiple, and they are sequentially arranged along a first preset direction, and the support assembly is arranged between any two adjacent electrode groups to form an accommodation space for the two electrode groups, and the ear clusters of the two electrode groups close to each other extend into the accommodation space.

[0005] In the above technical solution, further, the support assembly includes a first support member and a second support member, and the first support member is assembled and connected to the second support member.

[0006] In any of the above technical solutions, further, the first support member includes a first clamping portion and a first support portion connected to each other, and the first support portion is arranged on the side of the first clamping portion; the second support member includes a second clamping portion and a second support portion connected to each other, and the second support portion is arranged on the side of the second clamping portion;

[0007] The first clamping portion and the second clamping portion are butted against each other; the first support portion and the second support portion are butted against each other to form an accommodation cavity with openings on both sides, and the positive ear clusters and negative ear clusters of two adjacent electrode groups extend into the accommodation cavity through the corresponding openings.

[0008] In any of the above technical solutions, further, the first clamping portion is formed with a buckle, the second clamping portion is formed with a clamping hole, and the buckle is clamped in the clamping hole.

[0009] In any of the above technical solutions, further, a first groove is formed on a side of the first engaging portion facing away from the second engaging portion.

[0010] In any of the above technical solutions, further, a second groove communicating with the engaging hole is formed on a side of the second engaging portion facing away from the first engaging portion.

[0011] In any of the above technical solutions, further, the battery cell further includes a supporting end plate. At least one of any two adjacent pole groups is provided with the supporting end plate, and the supporting end plate is connected to the pole group; a through opening is formed on the supporting end plate, and the pole ear cluster of the pole group extends through the through opening to a side of the supporting end plate close to the other pole group; the supporting component abuts against the supporting end plate.

[0012] In any of the above technical solutions, further, the supporting end plate and the pole group are connected by gluing or hot melting.

[0013] In any of the above technical solutions, further, the supporting end plate and the supporting component are connected by gluing or hot melting.

[0014] In any of the above technical solutions, further, the battery cell further includes a housing and an intermediate explosion-proof valve; wherein, a plurality of the pole groups are all arranged in the housing, and the intermediate explosion-proof valve is installed at a position of the housing corresponding to the butt joint of two adjacent pole groups, and the intermediate explosion-proof valve communicates with the inside of the housing.

[0015] In any of the above technical solutions, further, the battery cell further includes side plates. At least one narrow side of any pole group is provided with the side plates, and the side plates are arranged in the housing; an avoidance space is formed between any two adjacent side plates.

[0016] In any of the above technical solutions, further, the battery cell further includes a cover plate assembly and an end explosion-proof valve; wherein, along a second preset direction, openings are formed at both ends of the housing, and the cover plate assembly is installed at any of the openings, and at least one of the cover plate assemblies is provided with the end explosion-proof valve.

[0017] In any of the above technical solutions, further, the intermediate explosion-proof valve is installed on the narrow side of the housing.

[0018] In any of the above technical solutions, further, the positive pole ear clusters and the negative pole ear clusters of any two adjacent pole groups are lapped together and connected by welding.

[0019] Compared with the prior art, the beneficial effects of the present application are:

[0020] The present application provides a relatively long battery cell, which helps to increase the overall capacity. The overall electrode group inside the battery cell is designed as a split structure, and a support component is arranged between adjacent electrode groups, so that there is an accommodation space formed between the two electrode groups, which serves to avoid the ear cluster, thus making it possible to realize the docking of the two electrode groups. 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, reducing the length of the electrode sheet. Furthermore, problems such as wrinkles, deformation, layer displacement or fracture are not likely to occur during the production of the electrode sheet and the subsequent assembly process, which helps to improve the yield rate and reduce costs. In addition, a support component is arranged between the two electrode groups, which improves the overall strength and the voltage resistance performance.

[0021] In addition, the ear clusters between the electrode groups are directly connected, reducing the number of structural components, which serves to reduce costs and the internal resistance of the battery cell.

[0022] In addition, a support end plate is arranged at the end of the electrode group, which serves to isolate and support, reducing the risk of damaging the electrode group.

[0023] In addition, an intermediate explosion-proof valve is installed at the position of the housing corresponding to the docking of two adjacent electrode groups, and the intermediate explosion-proof valve is communicated with the inside of the housing. The gas in the middle of the battery cell can quickly converge at the intermediate explosion-proof valve through the internal air passage and be quickly discharged from the battery cell, improving the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 be obtained based on these drawings without creative efforts.

[0025] Figure 1 is an exploded view of the battery cell provided by the embodiment of the present application;

[0026] Figure 2 is Figure 1 a partial enlarged structural schematic diagram of

[0027] Figure 3 is an assembly schematic diagram of two adjacent electrode groups provided by the embodiment of the present application;

[0028] Figure 4 is an exploded view of the support component provided by the embodiment of the present application;

[0029] Figure 5 is an assembly diagram of the support component provided by the embodiment of the present application;

[0030] Figure 6 Another assembly diagram of the support component provided by the embodiment of the present application;

[0031] Figure 7 It is Figure 6 A cross-sectional view along the A-A section;

[0032] Figure 8 It is Figure 6 A cross-sectional view along the B-B section;

[0033] Figure 9 A structural schematic diagram of the battery cell provided by the embodiment of the present application;

[0034] Figure 10 It is Figure 9 A cross-sectional view along the C-C section;

[0035] Figure 11 It is Figure 10 A partially enlarged structural schematic diagram;

[0036] Figure 12 A cross-sectional view of the battery cell provided by the embodiment of the present application along the side of the narrow surface parallel to the battery cell;

[0037] Figure 13 A structural schematic diagram of the support end plate provided by the embodiment of the present application.

[0038] Reference numerals:

[0039] 1 - Pole group, 11 - First pole group, 111 - Positive electrode tab cluster, 12 - Second pole group, 121 - Negative electrode tab cluster, 2 - Support component, 21 - First support member, 211 - First clamping portion, 2111 - Snap, 212 - First support portion, 22 - Second support member, 221 - Second clamping portion, 222 - Second support portion, 3 - Support end plate, 31 - First support end plate, 32 - Second support end plate, 33 - Through opening, 4 - Housing, 5 - Intermediate explosion-proof valve, 6 - Side plate, 7 - Mylar film, 8 - Cover plate assembly. Detailed implementation manners

[0040] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0041] Generally, the components of the embodiments of the present application described and shown in the accompanying 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 accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents the selected embodiments of the present application.

[0042] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0043] 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 cannot be understood as indicating or implying relative importance.

[0044] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" 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 situations.

[0045] Next, refer to Figures 1 to 13 Describe the battery cell according to some embodiments of the present application.

[0046] Refer to Figure 1 As shown, the embodiments of the present application provide a battery cell, including: a pole group 1 and a support assembly 2; wherein, the number of the pole groups 1 is multiple, and they are sequentially arranged along a first preset direction, and a support assembly 2 is arranged between any two adjacent pole groups 1 to form an accommodation space for the two pole groups 1, and the pole ear clusters of the two pole groups 1 close to each other extend into the accommodation space.

[0047] According to the structure described above, the present application provides a relatively long battery cell, which helps to increase the overall capacity. Moreover, the overall electrode group 1 inside the battery cell is designed as a split structure, and a support component 2 is arranged between adjacent electrode groups 1, so that there is an accommodation space formed between two adjacent electrode groups 1, which serves to avoid the ear cluster. And under the support of the support component 2, the ear cluster can be prevented from being crushed, thus making it possible to realize the docking of the two electrode groups 1. It can be seen that the overall electrode group 1 is designed as a split structure, thereby reducing the length of a single electrode group 1, that is to say, reducing the length of the electrode sheet, and thus it is not easy to have problems such as wrinkles, deformation, layer displacement or fracture during the production and later assembly of the electrode sheet, which helps to improve the yield rate and helps to reduce the cost. In addition, by arranging the support component 2 between the two electrode groups 1, the overall strength is improved and the voltage resistance performance is enhanced.

[0048] Further, preferably, the number of the electrode groups 1 is two, and this will also be taken as an example for illustration later. And in order to distinguish the two electrode groups 1, they are respectively named the first electrode group 11 and the second electrode group 12. Of course, it is not limited to this, and the number of the electrode groups 1 can also be more than two, such as three, four, five or six, etc., and they are arranged in sequence along the first preset direction.

[0049] Further, preferably, the first preset direction is the same as the length direction b of the electrode group 1. Of course, it is not limited to this.

[0050] It should be noted that: along the first preset direction, two adjacent electrode groups 1 are abutted against both sides of the support component 2 therebetween, and a small gap may also be left, which is specifically selected according to actual needs.

[0051] In this embodiment, preferably, as Figure 2 、 Figures 4 to 12 shown, the support component 2 includes a first support member 21 and a second support member 22, and the first support member 21 is snap-connected with the second support member 22, and this will also be taken as an example for illustration later.

[0052] According to the structure described above, the two support members are connected by snap connection, and the structure is more stable and firm, and has repeatable operability.

[0053] It should be noted that: the first support member 21 and the second support member 22 are not limited to be connected by snap connection. After the first support member 21 and the second support member 22 are assembled between the two electrode groups 1, they can also be connected by hot melting or gluing.

[0054] In this embodiment, preferably, as Figures 4 to 8 、 Figure 12As shown, the first support member 21 includes a first clamping portion 211 and a first support portion 212 connected to each other, and the first support portion 212 is disposed on the side of the first clamping portion 211; the second support member 22 includes a second clamping portion 221 and a second support portion 222 connected to each other, and the second support portion 222 is disposed on the side of the second clamping portion 221;

[0055] The first clamping portion 211 and the second clamping portion 221 are butt-jointed and snapped 2111 together; the first support portion 212 and the second support portion 222 are butt-jointed to form a receiving cavity with openings on both sides, and the positive ear clusters 111 and the negative ear clusters 121 of two adjacent pole groups 1 extend into the receiving cavity via the corresponding openings.

[0056] According to the structure described above, by butt-joining and snapping the first clamping portion 211 and the second clamping portion 221 together, the connection between the first support member 21 and the second support member 22 is realized, that is, the connection between two adjacent pole groups 1 is realized. And when the first clamping portion 211 and the second clamping portion 221 are snapped together, a receiving cavity is exactly formed between the first support portion 212 on one side of the first clamping portion 211 and the second support portion 222 on one side of the second clamping portion 221. A part of the structure of the positive ear cluster 111 extends into the receiving cavity via the side opening of the receiving cavity, and a part of the structure of the negative ear cluster 121 extends into the receiving cavity via the side opening of the receiving cavity and overlaps with the aforementioned part of the structure of the positive ear cluster 111, playing a role of avoidance and limitation.

[0057] It should be noted that: the first clamping portion 211 and the second clamping portion 221 are not limited to clamping, and the first clamping portion 211 and the second clamping portion 221 can also be connected by means such as hot melting or gluing.

[0058] In this embodiment, preferably, as Figure 4 and Figure 8 shown, the first clamping portion 211 is formed with a snap 2111, the second clamping portion 221 is formed with a clamping hole, and the snap 2111 is snapped into the clamping hole.

[0059] According to the structure described above, through the cooperation of the snap 2111 and the clamping hole, it is easy to realize the assembly of the first support member 21 and the second support member 22, and the operation is simple and convenient, and has repeatable operability.

[0060] Further, preferably, a first groove is formed on the side of the first clamping portion 211 facing away from the second clamping portion 221. That is to say, the first clamping portion 211 is a groove structure, and preferably, the first clamping portion 211 is a square groove. It can be seen that while ensuring strength, it helps with lightweight design, and has a regular shape, which is convenient for processing and manufacturing. Preferably, the aforementioned buckle 2111 is provided on the outer bottom wall of this square groove. Of course, the first clamping portion 211 can also be a groove of other shapes, such as a circular groove or a polygonal groove, or a solid structure without a groove.

[0061] Further, preferably, a second groove communicating with the clamping hole is formed on the side of the second clamping portion 221 facing away from the first clamping portion 211. That is to say, the second clamping portion 221 is a groove structure, and preferably, the second clamping portion 221 is a square groove. It can be seen that while ensuring strength, it helps with lightweight design, and has a regular shape, which is convenient for processing and manufacturing as well as assembling with the first clamping portion 211. Preferably, the aforementioned clamping hole is opened on the bottom wall of this square groove. Of course, the second clamping portion 221 can also be a groove of other shapes, such as a circular groove or a polygonal groove, or a solid structure without a groove.

[0062] Further, preferably, both the first supporting portion 212 and the second supporting portion 222 are long plate structures and extend along the height direction of the electrode group 1. The planes on the sides of the two long plates close to each other are both plane structures parallel to the ends of the electrode group 1. The aforementioned accommodating cavity is formed between the two plane structures, while the sides of the two first supporting portions 212 and the second supporting portions 222 facing away from each other are parallel inclined plane structures, which play a role in avoiding interference.

[0063] Further, preferably, the number of the first clamping portions 211 is two, and they are connected to both ends of the first supporting portion 212 along the height direction of the electrode group 1; correspondingly, the number of the second clamping portions 221 is also two, and they are connected to both ends of the second supporting portion 222 along the height direction of the electrode group 1. The two second clamping portions 221 correspond to the two first clamping portions 211 one by one and are assembled together to improve the stability and firmness of the connection. Of course, it is not limited to this. The number of the first clamping portions 211 and the second clamping portions 221 can also be one each, which is specifically selected according to actual needs.

[0064] In addition, the structures of the first supporting portion 212 and the second supporting portion 222 are not limited to the above. For example, they can also be flat plate structures with the same thickness. That is to say, the sides of the two limiting portions, namely the two long plates, close to or away from each other are both non-inclined plane structures, etc., which are specifically designed according to actual needs.

[0065] In this embodiment, preferably, as Figure 2 、 Figures 10 to 13As shown, the battery cell further includes support end plates 3. One support end plate 3 is provided for each of any two adjacent pole groups 1. For the sake of easy distinction, the two support end plates 3 are respectively named the first support end plate 31 and the second support end plate 32. And one of the support end plates 3, that is, the first support end plate 31, is connected to the first support member 21, and the other support end plate 3, that is, the second support end plate 32, is connected to the second support member 22;

[0066] Both the first support end plate 31 and the second support end plate 32 are formed with through openings 33. The positive electrode ear cluster 111 of one pole group 1, for example, the first pole group 11, passes through the corresponding through opening 33 and extends to the side of the first support end plate 31 close to the other pole group 1, for example, the second pole group 12. Similarly, the negative electrode ear cluster 121 of the second pole group 12 passes through the corresponding through opening 33 and extends to the side of the second support end plate 32 close to the first pole group 11. Of course, it is not limited to this. It is also possible to make the first pole group 11 form the positive electrode ear cluster 111 and the second pole group 12 form the negative electrode ear cluster 121, which is specifically selected according to actual needs.

[0067] According to the structure described above, the two aforementioned support end plates 3 play a role of isolation and support, which helps to improve the overall strength, reduce the risk of damaging the pole group 1, and can avoid problems such as short circuits caused by incorrect electrical connections, thereby improving safety and reliability.

[0068] Furthermore, preferably, the aforementioned first support end plate 31, first support member 21, second support end plate 32, and second support member 22 are all made of insulating materials, which can be plastics or rubbers, etc.

[0069] Furthermore, preferably, the material of the support end plate 3 is an insulating material such as plastics or rubbers, etc.

[0070] In this embodiment, preferably, as Figures 1 to 3 shown, the first support end plate 31 is connected to the first support member 21, and the second support end plate 32 is connected to the second support member 22.

[0071] According to the structure described above, the first support member 21, the first support end plate 31, and the first pole group 11 are sequentially connected together to form an assembly, which improves the overall strength and is not easily deformed, etc. Similarly, the second support member 22, the second support end plate 32, and the second pole group 12 are sequentially connected together to form an assembly, which improves the overall strength and is not easily deformed, etc.

[0072] It should be noted that for two adjacent pole groups 1, it is not limited to each pole group 1, that is, both two pole groups 1 are provided with support end plates 3. It is also possible to provide only one support end plate 3 for one of the pole groups 1, or neither of the two pole groups 1 is provided with a support end plate 3. And for the pole group 1 without a support end plate 3, the support members in the support assembly 2 corresponding to the pole group 1 without a support end plate 3 can be directly abutted against each other, or there can be a certain gap, etc.

[0073] In this embodiment, preferably, the first support end plate 31 and the first pole group 11, and the second support end plate 32 and the second pole group 12 are connected by gluing or hot melting. The above processes are mature, the operation is simple and convenient, and the connection position is more firm and stable.

[0074] Of course, the connection methods between the first support end plate 31 and the first pole group 11, and the second support end plate 32 and the second pole group 12 are not limited to the above, and can also be designed according to actual needs.

[0075] In this embodiment, preferably, the first support member 21 and the first support end plate 31, and the second support member 22 and the second support end plate 32 can be connected by gluing or hot melting, etc. Of course, it is not limited to this, and it can also be designed according to actual needs. Especially when the first support end plate 31 and the second support end plate 32 are not provided, the first support member 21 can also be directly glued or hot melted together with the corresponding pole group 1, that is, the first pole group 11, and the first support member 21 can also be directly glued or hot melted together with the corresponding pole group 1, that is, the second pole group 12. Or there is no connection relationship between the first support member 21 and the first pole group 11, and between the second support member 22 and the second pole group 12, and they are only abutted against each other or in clearance fit.

[0076] In this embodiment, preferably, as Figure 1 shown, the battery cell further includes a housing 4 and an intermediate explosion-proof valve 5; wherein, a plurality of pole groups 1 are all arranged in the housing 4, and an intermediate explosion-proof valve 5 is installed at a position of the housing 4 corresponding to the butt joint of two adjacent pole groups 1, and the intermediate explosion-proof valve 5 is communicated with the inside of the housing 4.

[0077] According to the structure described above, the intermediate explosion-proof valve 5 corresponds to the joint of the two pole groups 1, and the gas in the middle of the battery cell can quickly converge at the intermediate explosion-proof valve 5 through the internal air duct and be quickly discharged from the battery cell, improving the safety of the battery cell.

[0078] Further, preferably, the first preset direction can be the length direction of the battery cell, that is, the length direction of the housing 4. Of course, it is not limited to this.

[0079] Further, preferably, the middle explosion-proof valve 5 is installed on the narrow side of the housing 4 (the narrow side of the housing 4 refers to the side with a smaller area formed by the long side and the wide side). This is mainly because when multiple battery cells are assembled and used together, the large sides of the battery cells are abutted against each other. That is to say, the side with a larger area formed by the long side and the high side of the housing 4 is abutted against each other. If the explosion-proof valve is set on the large side of the housing 4, it will affect the opening of the valve for exhaust. Therefore, the middle explosion-proof valve 5 is installed on the narrow side of the housing 4. Of course, it is not limited to this, and the middle explosion-proof valve 5 can also be set on the large side of the housing 4.

[0080] Further, preferably, the lengths of the two pole groups 1 are the same. At this time, the middle explosion-proof valve 5 is located at the middle position of the housing 4, and the exhaust effect is better. Of course, the lengths of the pole groups 1 can also be different. At this time, the middle explosion-proof valve 5 changes with the position of the docking part of the pole groups 1 and is no longer located at the middle position of the housing 4, and is designed according to actual needs.

[0081] In addition, it should also be noted that: when the number of the pole groups 1 is more than two, for example, when the number of the pole groups 1 is three, there are two docking parts of the pole groups 1 at this time, so the number of the middle explosion-proof valves 5 is two; when the number of the pole groups 1 is four, there are three docking parts of the pole groups 1 at this time, so the number of the middle explosion-proof valves 5 is three, and the design is carried out according to this rule.

[0082] In addition, when the number of the pole groups 1 is more than two, the aforementioned support components 2 and support end plates 3 are arranged between any two adjacent pole groups 1.

[0083] In this embodiment, preferably, as Figure 1 shown, the battery cell further includes a side plate 6. At least one narrow side of any one of the pole groups 1 is provided with the side plate 6, and the side plate 6 is arranged inside the housing 4; an avoidance space is formed between any two adjacent side plates 6.

[0084] According to the structure described above, the function of the side plate 6 is to play a role in protection and guidance when the pole group 1 enters the housing, and to improve the efficiency of entering the housing. The avoidance space formed between two adjacent side plates 6 can be used to avoid the first support member 21 and the second support member 22. That is to say, the ends of the first support member 21 and the second support member 22 extend into this avoidance space.

[0085] It should be noted that: the battery cell includes a wide side and a narrow side. The wide side, that is, the large side, refers to the side surface formed by the long side and the high side, and its area is larger; the narrow side, that is, the small side, refers to the side surface formed by the long side and the wide side, and its area is smaller.

[0086] In this embodiment, preferably, as Figure 1As shown, the battery cell further includes a cover plate assembly 8 and an end explosion-proof valve; wherein, openings are formed at both ends of the housing 4 along the second preset direction, and a cover plate assembly 8 is installed at any one of the openings, and at least one cover plate assembly 8 is provided with an end explosion-proof valve. Preferably, the second preset direction may be the same as the first preset direction.

[0087] According to the structure described above, an end explosion-proof valve is provided at at least one of the two ends of the battery cell along its length direction, which speeds up the exhaust during thermal runaway and further improves the safety and reliability of the battery.

[0088] Further, preferably, the battery cell further includes a mylar film 7. After all the electrode groups 1, the support assembly 2, and the side plates 6 are assembled together, the outside needs to be wrapped with the mylar film 7 to play a protective role. The side plates 6 are arranged inside the mylar film 7 and can be glued or heat-melted together with the mylar film 7, and auxiliary through holes are opened at the positions corresponding to the explosion-proof valves on the mylar film 7 to ensure normal exhaust during thermal runaway.

[0089] Further, preferably, the opening area of the end explosion-proof valve is smaller than the opening area of the middle explosion-proof valve 5. Since the area of the narrow side of the housing 4 is larger, the middle explosion-proof valve 5 can be designed to be larger, which helps to quickly exhaust gas.

[0090] It should be noted that: the cover plate assembly 8 can adopt the battery cell cover plate structure in the prior art and will not be elaborated here.

[0091] In this embodiment, preferably, as Figure 3 shown, the positive ear clusters 111 and the negative ear clusters 121 of any two adjacent electrode groups 1 that are close to each other are lapped together and connected by welding.

[0092] According to the structure described above, the ear clusters between the electrode groups 1 are directly connected, reducing the number of structural parts and playing the role of cost reduction and reducing the internal resistance of the battery cell.

[0093] Further, preferably, the structure in which the positive ear cluster 111 and the negative ear cluster 121 of two adjacent electrode groups 1 are connected is located in the accommodation cavity formed between the two aforementioned limiting parts.

[0094] Further, preferably, the positive ear cluster 111 and the negative ear cluster 121 are connected by welding.

[0095] Of course, there may also be no connection relationship between the positive ear cluster 111 and the negative ear cluster 121 that are close to each other, which is specifically designed according to actual needs.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended 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 battery cell, characterized in that, include: Pole groups and support components; wherein, there are multiple pole groups, which are arranged sequentially along a first preset direction, and the support component is arranged between any two adjacent pole groups to form a accommodating space for the two pole groups, and the pole ear clusters of the two pole groups that are close to each other extend to the accommodating space.

2. The battery cell according to claim 1, wherein, The supporting assembly includes a first supporting member and a second supporting member, and the first supporting member is assembled and connected to the second supporting member.

3. The battery cell according to claim 2, characterized in that, The first supporting member includes a first clamping portion and a first supporting portion connected to each other, and the first supporting portion is arranged on a side of the first clamping portion; the second supporting member includes a second clamping portion and a second supporting portion connected to each other, and the second supporting portion is arranged on a side of the second clamping portion; The first clamping portion and the second clamping portion are connected to each other; the first supporting portion and the second supporting portion are connected to each other to form a receiving cavity with openings on both sides, and the positive electrode ear clusters and negative electrode ear clusters of two adjacent electrode groups extend into the receiving cavity through the corresponding openings.

4. The battery cell according to claim 3, characterized in that, The first clamping portion is formed with a clamping buckle, the second clamping portion is formed with a clamping hole, and the clamping buckle is clamped in the clamping hole.

5. The battery cell according to claim 4, characterized in that, A first groove is formed on a side of the first clamping portion facing away from the second clamping portion; and / or A second groove communicating with the clamping hole is formed on a side of the second clamping portion away from the first clamping portion.

6. The cell according to claim 1, wherein The battery cell also includes a support end plate, at least one of any two adjacent pole groups is equipped with the support end plate, and the support end plate is connected to the pole group; the support end plate is formed with a through-opening, and the pole ear cluster of the pole group extends through the through-opening to the side of the support end plate close to the other pole group; the support assembly abuts against the support end plate.

7. The battery cell according to claim 6, wherein, The supporting end plate is connected to the pole group by gluing or hot melting; and / or The support end plate is connected to the support assembly by gluing or hot melting.

8. The battery cell according to claim 1, wherein, The battery cell also includes a shell and an intermediate explosion-proof valve; wherein, the plurality of pole groups are arranged in the shell, and the intermediate explosion-proof valve is installed at the position of the shell corresponding to the relative connection between two adjacent pole groups, and the intermediate explosion-proof valve is connected to the interior of the shell.

9. The battery cell according to claim 8, wherein, The battery cell further comprises a side plate, which is disposed on at least one narrow side of any of the electrode groups, and is disposed in the housing; wherein an escape space is formed between any two adjacent side plates; and / or The battery cell further includes a cover plate assembly and an end explosion-proof valve; wherein, along the second preset direction, both ends of the shell are formed with openings, and the cover plate assembly is installed at any of the openings, and at least one of the cover plate assemblies is provided with the end explosion-proof valve; and / or The intermediate explosion-proof valve is installed on the narrow surface side of the housing.

10. The battery cell according to any one of claims 1 to 9, characterized in that, The positive electrode ear clusters and negative electrode ear clusters close to any two adjacent electrode groups are stacked together and connected by welding.

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