A single cell and a battery pack

Abstract

The application discloses a single battery and a battery pack, and relates to the technical field of new energy batteries. The single battery comprises a shell, an opening is arranged at one end of the shell, an electric core is arranged in the shell, one end of the electric core facing the opening is provided with a tab, a cover plate assembly covers the opening and is connected with the shell, an insulating partition plate assembly is arranged between the electric core and the cover plate assembly, the tab is arranged in the partition plate assembly and is connected with the cover plate assembly. The single battery provided by the application can prevent the short circuit problem caused by the insertion of the tab.

Description

Technical Field

[0001] This application relates to the field of new energy battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0002] Currently, many batteries suffer from redundant tab insertion and micro-short circuits between the tabs and electrodes, leading to low cell voltage. Furthermore, micro-short circuits between the tabs and electrodes can severely negatively impact battery performance, safety, and lifespan, manifesting as significantly reduced voltage, accelerated self-discharge rate, localized overheating, capacity decay, and shortened cycle life. These issues affect normal battery use and pose significant safety hazards. Utility Model Content

[0003] This application provides a single-cell battery and a battery pack to prevent short circuits caused by inserting the tabs.

[0004] This application provides a single-cell battery, comprising:

[0005] A housing, one end of which is provided with an opening;

[0006] A battery cell is disposed in the housing, and a tab is provided at the end of the battery cell facing the opening;

[0007] A cover assembly that covers the opening and is connected to the housing;

[0008] An insulating separator assembly is disposed between the battery cell and the cover plate assembly, and the electrode tab passes through the separator assembly and is connected to the cover plate assembly.

[0009] In some possible implementations, the battery cell is configured with a first tab and a second tab of opposite polarity, and the cover plate assembly is configured with a first electrode connecting piece and a second electrode connecting piece of opposite polarity on the side facing the battery cell, wherein the first tab is connected to the first electrode connecting piece and the second tab is connected to the second electrode connecting piece;

[0010] The partition assembly includes a first partition, on which a first connecting hole and a second connecting hole are provided, which are isolated from each other. The first electrode tab passes through the first connecting hole, and the second electrode tab passes through the second connecting hole.

[0011] In some possible implementations, the battery cell is configured with a first tab and a second tab of opposite polarity, and the cover plate assembly is configured with a first electrode connecting piece and a second electrode connecting piece of opposite polarity on the side facing the battery cell, wherein the first tab is connected to the first electrode connecting piece and the second tab is connected to the second electrode connecting piece;

[0012] The partition assembly includes two second partitions, each of which has a third connecting hole. The first electrode tab passes through the third connecting hole in one of the second partitions, and the second electrode tab passes through the third connecting hole in the other second partition.

[0013] In some possible implementations, the single battery cell includes a plurality of said cells, the separator assembly includes at least one third separator, the at least one third separator has a plurality of fourth connecting holes that are isolated from each other, and a plurality of said tabs of the plurality of said cells are correspondingly inserted into the plurality of fourth connecting holes.

[0014] In some possible implementations, the partition assembly includes a plurality of the third partitions, and the plurality of fourth connecting holes are disposed on the plurality of the third partitions, with at least one fourth connecting hole provided on each of the third partitions.

[0015] In some possible implementations, the single battery cell includes two cells, and the separator assembly includes four third separators, each of which has a fourth connecting hole.

[0016] The four tabs of the two battery cells are inserted one-to-one into the four fourth connecting holes.

[0017] In some possible implementations, the separator assembly has a groove on the side facing the battery cell and / or on the side facing the cover assembly;

[0018] And / or, the separator assembly is further provided with a perforated hole, the perforated hole being connected to the side of the separator assembly facing the battery cell and the side of the separator assembly facing the cover plate assembly.

[0019] In some possible implementations, the cell further includes a winding core and an insulating film, with the end of the electrode tab away from the cover plate assembly connected to the winding core;

[0020] The insulating film is covered on the core from the end of the core away from the cover plate assembly and protrudes from the side of the core facing the cover plate assembly. The peripheral surface of the partition assembly is connected to the inner surface of the insulating film facing the core.

[0021] In some possible implementations, the single cell is configured with a first orientation, and the dimension T of the separator assembly along the first orientation is 0.3 mm ≤ T ≤ 1.5 mm.

[0022] In addition, this application also provides a battery pack, including the single battery cells provided in the above embodiments.

[0023] The beneficial effects of this application are as follows: In the single-cell battery provided by this application, the redundant tabs can be located in the space between the separator assembly and the cover assembly, thereby preventing the tabs from being inserted internally by the separator assembly. Simultaneously, the separator assembly has insulating properties, preventing short circuits caused by electrical contact between the tabs and the cell's electrode plates. This further avoids serious adverse effects on the electrical performance, safety, and lifespan of the single-cell battery, ensuring its safe use and reducing safety hazards. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 Schematic diagrams of the structure of a single cell are shown in some embodiments;

[0026] Figure 2 A schematic diagram of part of the internal structure of a single cell is shown in some embodiments;

[0027] Figure 3 Schematic diagrams of cross-sectional structures of individual cells in some embodiments are shown;

[0028] Figure 4 Schematic diagrams of the cell and separator assembly are shown in some embodiments;

[0029] Figure 5 A schematic diagram of the structure of the first partition is shown in some embodiments;

[0030] Figure 6 A side view of the first partition is shown in some embodiments;

[0031] Figure 7 Schematic diagrams of the cell and separator assembly are shown in other embodiments;

[0032] Figure 8 A schematic diagram of the structure of the second partition is shown in some embodiments;

[0033] Figure 9 Schematic diagrams of cross-sectional structures of individual cells in other embodiments are shown;

[0034] Figure 10 A structural schematic diagram of the first partition is shown in some other embodiments;

[0035] Figure 11 Schematic diagrams of cross-sectional structures of individual cells are shown in some other embodiments;

[0036] Figure 12 A schematic diagram of the cross-sectional structure of a single cell is shown in some other embodiments.

[0037] Explanation of key component symbols:

[0038] 100 - Shell; 101 - Opening;

[0039] 200 - Battery cell; 210 - Tab; 211 - First tab; 212 - Second tab; 220 - Core; 230 - Insulating film;

[0040] 300-Cover plate assembly; 310-First electrode connecting piece; 320-Second electrode connecting piece; 330-Electrode post; 331-First electrode post; 332-Second electrode post; 340-Cover plate; 341-Injection hole; 350-Explosion-proof valve;

[0041] 400 - Partition assembly; 410 - First partition; 411 - First connecting hole; 412 - Second connecting hole; 420 - Second partition; 421 - Third connecting hole; 430 - Third partition; 440 - Fourth connecting hole; 401 - Groove; 402 - Hollow hole; 4021 - First hollow hole; 4022 - Second hollow hole;

[0042] 500-pallet;

[0043] M - First direction. Detailed Implementation

[0044] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] Example 1

[0050] like Figures 1 to 3 As shown in the embodiment, a single battery cell is provided, wherein the single battery cell can be a prismatic battery.

[0051] In this embodiment, the single battery cell includes a casing 100, a cell 200, a cover plate assembly 300, and an insulating separator assembly 400.

[0052] The housing 100 can be made of steel or aluminum. An opening 101 is provided at one end of the housing 100. A battery cell 200 can be disposed within the housing 100, and a tab 210 can be provided at the end of the battery cell 200 facing the opening 101. A cover assembly 300 covers the opening 101 and is connected to the end of the housing 100 facing the opening 101, thereby closing the opening 101. Simultaneously, the cover assembly 300 can be electrically connected to the tab 210. In this embodiment, a partition assembly 400 can be disposed within the housing 100 and located between the battery cell 200 and the cover assembly 300, and the tab 210 can pass through the cover assembly 300.

[0053] In this embodiment, the redundant tabs 210 can be located in the space between the separator assembly 400 and the cover assembly 300, thereby preventing the tabs 210 from being inserted internally by the separator assembly 400. Simultaneously, the separator assembly 400 is insulating, preventing the tabs 210 from making electrical contact with the electrode plates of the cell 200 and causing a short circuit. This further avoids serious adverse effects on the electrical performance, safety, and lifespan of the individual battery, ensuring the safe use of the individual battery and reducing safety hazards.

[0054] like Figures 1 to 3 As shown, in some embodiments, the cover assembly 300 may include a cover 340, a first terminal 331, a second terminal 332, and an explosion-proof valve 350. The cover 340 may be made of the same material as the housing 100. The cover 340 may cover the opening 101 of the housing 100 and be connected to the end of the housing 100 facing the opening 101 by welding or other means. This provides a relatively fixed connection between the cover 340 and the housing 100, and also seals the connection point to prevent leakage and other problems, ensuring the performance and safety of the individual battery cells.

[0055] In some embodiments, the cover plate 340 is further provided with an injection hole 341 communicating with the interior of the housing 100, so as to inject electrolyte into the housing 100. Additionally, the injection hole 341 can be sealed by an injection plug. In some embodiments, an explosion-proof valve 350 can also be provided on the cover plate 340 to relieve pressure in the event of thermal runaway of a single battery cell.

[0056] In some embodiments, the first terminal 331 and the second terminal 332 have opposite polarities, that is, one terminal 330 can be used as a positive terminal and the other terminal 330 can be used as a negative terminal. Exemplarily, the first terminal 331 can be used as a positive terminal and the second terminal 332 can be used as a negative terminal.

[0057] In some embodiments, the first pole 331 and the second pole 332 can be fixedly installed on the cover plate 340 by means of riveting or the like, and both are insulated from the cover plate 340. In addition, the first pole 331 and the second pole 332 are both inserted through the cover plate 340, and protrude from the side of the cover plate 340 facing the opening 101 and the side away from the opening 101.

[0058] In some embodiments, the cover plate assembly 300 further includes a first electrode connecting piece 310 and a second electrode connecting piece 320 with opposite polarities. The first electrode connecting piece 310 can be welded to the first electrode post 331, and the second electrode connecting piece 320 can be welded to the second electrode post 332.

[0059] like Figure 2 and Figure 3As shown, in some embodiments, the battery cell 200 further includes a wound core 220, a first tab 211, a second tab 212, and an insulating film 230. The wound core 220 may be formed by winding a positive electrode sheet, a negative electrode sheet, and a separator, wherein the separator may be located between the positive and negative electrode sheets, and the end of the separator facing the cover plate assembly 300 may protrude relative to the side of the positive and negative electrode sheets facing the cover plate assembly 300. The first tab 211 and the second tab 212 have opposite polarities, wherein one tab 210 can be used as a positive tab, and the other tab 210 can be used as a negative tab. Exemplarily, the first tab 211 can be used as a positive tab and is electrically connected to the positive electrode sheet. The second tab 212 can be used as a negative tab and is electrically connected to the negative electrode sheet. The first tab 211 and the second tab 212 are disposed at the end of the wound core 220 facing the opening 101. In some embodiments, the cell 200 may have all tabs 210. The first tab 211 and the second tab 212 may be located approximately at the middle of the thickness direction of the cell 200. The thickness direction of the cell 200 may be perpendicular to the plane containing the surface with the largest area in the single cell.

[0060] In some embodiments, the insulating film 230 may be a columnar structure closed at one end and an open structure at the other end. In an embodiment, the insulating film 230 may be fitted onto the core 220 from the end facing away from the cover plate assembly 300, and the end of the insulating film 230 facing the cover plate assembly 300 may protrude relative to the side of the core 220 facing the cover plate assembly 300. In an embodiment, the insulating film 230 may be used to achieve insulation between the core 220 and the housing 100 to prevent short circuits.

[0061] In some embodiments, the single battery cell further includes a tray 500, which may be disposed on the side of the cell 200 opposite to the outlet 101. The tray 500 may be connected to the surface of the insulating film 230 opposite to the core 220 by means of a hot-melt process, etc., to ensure the structural stability of the cell 200 during charging and discharging.

[0062] like Figures 2 to 5 As shown, in some embodiments, the individual battery cell has a first direction M, which may be parallel to the axial direction of the individual battery cell. The separator assembly 400 may include a first separator 410. The first separator 410 may have a first connecting hole 411 and a second connecting hole 412 that are isolated from each other. Both the first connecting hole 411 and the second connecting hole 412 can penetrate the first separator 410 along the first direction M. Furthermore, the first connecting hole 411 and the second connecting hole 412 may be located approximately at the center of the first separator 410 along the thickness direction of the cell 200.

[0063] In some embodiments, the first tab 211 may be inserted into the first connecting hole 411 so that the end of the first tab 211 away from the core 220 may extend to the side of the first partition 410 facing the cover plate assembly 300 and be welded to the first electrode connecting piece 310 in the cover plate assembly 300. In addition, the redundant portion of the first tab 211 may be accommodated between the first partition 410 and the cover plate 340.

[0064] In some embodiments, the second electrode tab 212 may be inserted into the second through hole 412 so that the end of the second electrode tab 212 away from the core 220 can extend to the side of the first partition 410 facing the cover plate assembly 300 and be welded to the second electrode connecting piece 320 in the cover plate assembly 300. Additionally, a redundant portion of the second electrode tab 212 may be accommodated between the first partition 410 and the cover plate 340.

[0065] In some embodiments, the first partition 410 may be a transparent polypropylene plate and has insulation properties, which can achieve insulation between the first tab 211 and the second tab 212.

[0066] In the embodiment, the first partition 410 can prevent the first tab 211 and / or the second tab 212 from being inserted, and can prevent the first tab 211 and / or the second tab 212 from contacting the positive / negative electrode sheets in the core 220 and causing a short circuit, thereby ensuring the normal use of the single battery and improving the safety of the single battery.

[0067] In some embodiments, the first partition 410 may be located on the side of the diaphragm facing the cover plate 340 and spaced apart from the diaphragm. The peripheral surface of the first partition 410 and the inner surface of the insulating film 230 facing the core 220 may be fixedly connected by means of heat fusion or other methods. Thus, the insulating film 230 can provide effective and reliable support for the first partition 410, and the first partition 410 and the insulating film 230 can cooperate to wrap the core 220, forming an integral protective structure, reducing the probability of short circuit problems. At the same time, the peripheral surface of the first partition 410 and the inner surface of the insulating film 230 facing the core 220 may be fixedly connected by means of heat fusion or other methods. The insulating film 230 can fix the first partitions 410 together and limit the position of the first partitions 410 to prevent the first partitions 410 from shaking.

[0068] like Figure 1 , Figure 3 and Figure 5 As shown, in some embodiments, the first separator 410 is further provided with a perforated hole 402, which can penetrate the first separator 410 along the first direction M. On the one hand, this can reduce the weight of the first separator 410, thereby reducing the weight of the individual battery. On the other hand, it can facilitate heat dissipation during the use of the individual battery, reduce heat accumulation inside the individual battery, and ensure the safety of the individual battery in use.

[0069] In this embodiment, the number and size of the perforated holes 402 can be set as needed, so as to achieve weight reduction and heat dissipation while ensuring the structural strength of the first partition 410.

[0070] In some embodiments, the first partition 410 may have a first perforation 4021 and a plurality of second perforations 4022. The first perforation 4021 may be located between the first connecting hole 411 and the second connecting hole 412, and has a large area. Furthermore, the first perforation 4021 may be opposite to the injection hole 341. Thus, during the injection of electrolyte, it can be ensured that the electrolyte can smoothly pass through the first partition 410 to reach the space where the core 220 is located, while simultaneously achieving weight reduction and heat dissipation. In embodiments, the plurality of second perforations 4022 may be distributed at other locations on the first partition 410, and may be uniformly or non-uniformly distributed.

[0071] In some embodiments, the first partition 410 has a groove 401 on the side facing the cover plate assembly 300, which can reduce the weight of the first partition 410.

[0072] In some embodiments, a groove 401 may also be provided on the side of the first partition 410 away from the cover plate assembly 300, which can reduce the weight of the first partition 410.

[0073] like Figure 3 and Figure 6As shown, in some embodiments, the dimension T of the first separator 410 along the first direction M is 0.3mm≤T≤1.5mm, which can effectively prevent short circuit problems caused by the insertion of the first tab 211 and the second tab 212. At the same time, it can avoid the adverse effects of the setting of the first separator 410 on the energy density and heat dissipation performance of the single battery.For example, in some embodiments, the dimension T of the first partition 410 along the first direction M is 0.30mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.40mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.50mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm. mm, 0.58mm, 0.59mm, 0.60mm, 0.61mm, 0.62mm, 0.63mm, 0.64mm, 0.65mm, 0.66mm, 0.67mm, 0.68mm, 0.69mm, 0.70mm, 0.71mm, 0.82mm, 0.73 mm, 0.74mm, 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, 0.80mm, 0.81mm, 0.82mm, 0.83mm, 0.84mm, 0.85mm, 0.86mm, 0.87mm, 0.88mm, 0.89m m, 0.90mm, 0.91mm, 0.92mm, 0.93mm, 0.94mm, 0.95mm, 0.96mm, 0.97mm, 0.98mm, 0.99mm, 1.00mm, 1.01mm, 1.02mm, 1.03mm, 1.04mm, 1.05m m, 1.06mm, 1.07mm, 1.08mm, 1.09mm, 1.10mm, 111mm, 1.12mm, 1.13mm, 1.14mm, 1.15mm, 1.16mm, 1.17mm, 1.18mm, 1.19mm, 1.20mm, 1.21mm 1.22mm, 1.23mm, 1.24mm, 1.25mm, 1.26mm, 1.27mm, 1.28mm, 1.29mm, 1.30mm, 1.31mm, 1.32mm, 1.33mm, 1.34mm, 1.35mm, 1.36mm, 1.37mm, 1.38mm, 1.39mm, 1.40mm, 1.41mm, 1.42mm, 1.43mm, 1.44mm, 1.45mm, 1.46mm, 1.47mm, 1.48mm, 1.49mm, 1.50mm or any other value from 0.30mm to 1.50mm.

[0074] Example 2

[0075] like Figure 2 , Figure 7 and Figure 8As shown, this embodiment provides a single-cell battery, which differs from Embodiment 1 in the following ways:

[0076] In this embodiment, the partition assembly 400 includes two second partitions 420. Each of the two second partitions 420 has a third connecting hole 421, which can penetrate the second partition 420 along a first direction M. A first tab 211 can pass through the third connecting hole 421 in one of the second partitions 420, and a second tab 212 can pass through the third connecting hole 421 in the other second partition 420.

[0077] In addition, each of the two second partition plates 420 is provided with a plurality of second perforated holes 4022. The plurality of second perforated holes 4022 on the same second partition plate 420 may be evenly or non-evenly distributed on the second partition plate 420 and avoid the third connecting hole 421.

[0078] In some embodiments, the second partition 420 has a groove 401 on the side facing the cover plate assembly 300, which can reduce the weight of the second partition 420.

[0079] In some embodiments, the second partition 420 may also have a groove 401 on the side opposite to the cover plate assembly 300, which can reduce the weight of the second partition 420.

[0080] Example 3

[0081] like Figure 2 , Figure 5 , Figure 9 and Figure 10 As shown, this embodiment provides a single-cell battery, which differs from Embodiment 1 in the following ways:

[0082] In this embodiment, the battery cell 200 may be a semi-outlet tab. Correspondingly, the tabs 210 (including the first tab 211 and the second tab 212) may be disposed near the thickness direction of the battery cell 200. Correspondingly, the first connecting hole 411 and the second connecting hole 412 may be located along the thickness direction of the battery cell 200 on one side of the first partition 410, and near the first tab 211 and the second tab 212. In some embodiments, the first connecting hole 411 and the second connecting hole 412 may be located approximately at 1 / 4 of the thickness direction of the battery cell 200.

[0083] Example 4

[0084] like Figure 2 and Figure 11 As shown, this embodiment provides a single-cell battery, which differs from Embodiment 1 in the following ways:

[0085] In some embodiments, a single battery cell may include two cells 200, and the two cells 200 may share an insulating film 230. Accordingly, the two cells 200 may include four tabs 210. The separator assembly 400 may include four third separators 430, each third separator 430 having a fourth connecting hole 440 that can penetrate the third separator 430 along a first direction M. The four tabs 210 are correspondingly disposed in the four connecting holes.

[0086] In other embodiments, the partition assembly 400 may include one, two, or three equal numbers of third partitions 430. All third partitions 430 share four fourth connecting holes 440, meaning the four fourth connecting holes 440 are distributed across all third partitions 430, and each third partition 430 has at least one fourth connecting hole 440. Four tabs 210 are correspondingly inserted into the four fourth connecting holes 440.

[0087] In other embodiments, the single battery cell may also include three, four, or other numbers of multiple cells 200. The separator assembly 400 may include at least one third separator 430. The at least one third separator 430 has a number of fourth connecting holes 440 equal to the number of tabs 210 in the multiple cells 200, and the multiple tabs 210 can be inserted one-to-one into the multiple fourth connecting holes 440.

[0088] Example 5

[0089] like Figure 2 and Figure 12 As shown, this embodiment provides a single-cell battery, which differs from Embodiment 1 in the following ways:

[0090] In this embodiment, the single battery cell may be a cylindrical battery. The casing 100 may be used as the negative electrode. The cover plate assembly 300 may include a first electrode post 331 and a first electrode connecting piece 310 connected to each other. The cell 200 has a first electrode tab 211, which serves as the positive electrode, disposed on the side facing the cover plate assembly 300. The separator assembly 400 may include a first separator 410, on which a first connecting hole 411 opposite to the first electrode tab 211 is formed. The first electrode tab 211 may pass through the first connecting hole 411 and be connected to the first electrode connecting piece 310.

[0091] In addition, the thickness T of the first partition 410 in the first direction M can be further explained by the following experiment in the embodiment. The experimental data can be seen in Table 1.

[0092] Table 1

[0093]

[0094] Based on experimental data, it can be seen that in this application, setting the dimension T (i.e. the thickness of the first separator 410) in the first direction M to 0.3mm≤T≤1.5mm can effectively prevent short circuit problems caused by the insertion of the first tab 211 and the second tab 212. At the same time, it can avoid the adverse effects on the energy density of the single cell caused by the setting of the first separator 410.

[0095] The embodiment also provides a battery pack, which may include the individual battery cells provided in the embodiment.

[0096] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0097] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A single-cell battery, characterized in that, include: A housing (100), one end of which is provided with an opening (101). A battery cell (200) is disposed in the housing (100), and a tab (210) is provided at one end of the battery cell (200) facing the opening (101). A cover plate assembly (300) covers the opening (101) and is connected to the housing (100); An insulating separator assembly (400) is disposed between the cell (200) and the cover assembly (300), and the tab (210) passes through the separator assembly (400) and is connected to the cover assembly (300).

2. The single-cell battery according to claim 1, characterized in that, The battery cell (200) is provided with a first tab (211) and a second tab (212) of opposite polarity. The cover plate assembly (300) is provided with a first electrode connecting piece (310) and a second electrode connecting piece (320) of opposite polarity on the side facing the battery cell (200). The first tab (211) is connected to the first electrode connecting piece (310), and the second tab (212) is connected to the second electrode connecting piece (320). The partition assembly (400) includes a first partition (410), on which a first connecting hole (411) and a second connecting hole (412) are provided, which are isolated from each other. The first electrode (211) passes through the first connecting hole (411), and the second electrode (212) passes through the second connecting hole (412).

3. The single-cell battery according to claim 1, characterized in that, The battery cell (200) is provided with a first tab (211) and a second tab (212) of opposite polarity. The cover plate assembly (300) is provided with a first electrode connecting piece (310) and a second electrode connecting piece (320) of opposite polarity on the side facing the battery cell (200). The first tab (211) is connected to the first electrode connecting piece (310), and the second tab (212) is connected to the second electrode connecting piece (320). The partition assembly (400) includes two second partitions (420), each of which has a third connecting hole (421). The first tab (211) passes through the third connecting hole (421) on one of the second partitions (420), and the second tab (212) passes through the third connecting hole (421) on the other second partition (420).

4. The single-cell battery according to claim 1, characterized in that, The single battery cell includes a plurality of cells (200), and the separator assembly (400) includes at least one third separator (430). The at least one third separator (430) has a plurality of fourth connecting holes (440) that are isolated from each other. The plurality of tabs (210) of the plurality of cells (200) are correspondingly inserted into the plurality of fourth connecting holes (440).

5. The single-cell battery according to claim 4, characterized in that, The partition assembly (400) includes a plurality of third partitions (430), and a plurality of fourth connecting holes (440) are disposed on the plurality of third partitions (430), and each third partition (430) has at least one fourth connecting hole (440).

6. The single-cell battery according to claim 5, characterized in that, The single battery cell includes two cells (200), and the separator assembly (400) includes four third separators (430), each of the third separators (430) having a fourth connecting hole (440). The four tabs (210) of the two cells (200) are respectively inserted into the four fourth connecting holes (440).

7. The single-cell battery according to any one of claims 1 to 6, characterized in that, The separator assembly (400) has a groove (401) on the side facing the cell (200) and / or the separator assembly (400) has a groove (401) on the side facing the cover assembly (300). And / or, the partition assembly (400) is further provided with a perforated hole (402), the perforated hole (402) being connected to the side of the partition assembly (400) facing the cell (200) and the side of the partition assembly (400) facing the cover plate assembly (300).

8. The single-cell battery according to any one of claims 1 to 6, characterized in that, The cell (200) also includes a core (220) and an insulating film (230), and the end of the tab (210) away from the cover plate assembly (300) is connected to the core (220). The insulating film is covered by the end of the core (220) facing away from the cover plate assembly (300) and protrudes from the side of the core (220) facing the cover plate assembly (300). The peripheral surface of the partition assembly (400) is connected to the inner surface of the insulating film (230) facing the core (220).

9. The single-cell battery according to any one of claims 1 to 6, characterized in that, The single cell is configured with a first direction (M), and the dimension T of the separator assembly (400) along the first direction (M) is 0.3mm≤T≤1.5mm.

10. A battery pack, characterized in that, Including the single cell battery as described in any one of claims 1 to 9.

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