Single battery and battery pack
By installing a current blocking device inside the terminal hole, the problem of low safety of a single cell is solved, and the current blocking effect is achieved under abnormal conditions, thus improving the safety of the battery.
Patent Information
- Application Number
- CN202422783001.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-13
AI Technical Summary
Individual cells have low safety, especially due to the difficulty in current blocking design, which makes them prone to abnormal phenomena such as external short circuits, cell overcurrent and overheating.
A current blocking component is installed inside the electrode hole, including an electrical connection part and a current blocking part. The current blocking part is insulated from the battery cell and the electrode, and can block or reduce the current between the battery cell and the electrode under preset conditions.
When a single battery cell malfunctions, the current blocking device can effectively block or reduce the current, thereby reducing safety hazards and improving the safety of the single battery cell.
Smart Images
Figure CN223539724U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology
[0002] Safety performance is a crucial indicator for individual battery cells, making their safety design paramount. Due to their high space utilization and structural design limitations, individual battery cells present significant challenges in designing current blocking between the cell and terminals. This leads to risks of external short circuits, cell overcurrent, and cell overheating during use, all of which compromise the safety of the individual battery cell. Utility Model Content
[0003] In view of this, the purpose of this application is to provide a single battery cell and a battery pack, which aims to solve the technical problem of low safety of single batteries cell.
[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0005] In a first aspect, embodiments of this application provide a single-cell battery, comprising:
[0006] The outer casing has a receiving cavity and an end hole communicating with the receiving cavity;
[0007] The battery cell is disposed within the receiving cavity;
[0008] The pole post is insulated from the outer casing and seals the end hole, and the pole post has a through hole;
[0009] A current blocking device is disposed in the electrode hole. The current blocking device includes an electrical connection part and a current blocking part electrically connected to the electrical connection part. The electrical connection part is electrically connected to the electrode. The current blocking part is located between the electrical connection part and the battery cell. The current blocking part is electrically connected to the battery cell and is insulated from the electrode. The current blocking part can block or reduce the current between the battery cell and the electrode under preset conditions.
[0010] In one embodiment of the first aspect, there is a gap between the current blocking portion and the hole wall of the electrode post, and the single cell further includes a first insulating member located within the gap and disposed around the outer periphery of the current blocking portion.
[0011] In one embodiment of the first aspect, a first clearance groove is provided on the electrode post. The first clearance groove is opened on the hole wall of the electrode post hole along the circumference of the electrode post, and the opening of the first clearance groove faces the circumferential wall of the current blocking part near the battery cell.
[0012] In one embodiment of the first aspect, the single battery cell further includes a current collector, the terminal post is insulated from the current collector, and the current collector is electrically connected between the battery cell and the current blocking part.
[0013] In one embodiment of the first aspect, a second clearance groove is provided on the end face of the electrode post facing the battery cell. The second clearance groove is arranged in an annular shape and communicates with the electrode post hole.
[0014] In one embodiment of the first aspect, the single cell further includes a welding member welded between the current blocking part and the current collector, so that the current blocking part and the current collector are connected.
[0015] In one embodiment of the first aspect, the electrical connection portion, the welded component, and the current blocking portion are all cylindrical, the electrode hole is a circular hole, the diameter of the electrical connection portion is less than or equal to the diameter of the electrode hole, the diameter of the welded component is less than the diameter of the electrical connection portion, and the diameter of the welded component is greater than the diameter of the current blocking portion.
[0016] In one embodiment of the first aspect, the current blocking part is a positive temperature coefficient thermistor or a fuse.
[0017] In one embodiment of the first aspect, the outer casing includes a housing, a first end plate, and a second end plate. The housing is cylindrical, and the first end plate and the second end plate are respectively disposed at both ends of the housing along the cylindrical axis to form a receiving cavity. The first end plate and the second end plate are each provided with an end hole and a pole post. The pole post located on the first end plate is a positive pole post, and the pole post located on the second end plate is a negative pole post.
[0018] Secondly, embodiments of this application also provide a battery pack, including the single battery cells in any of the embodiments of the first aspect described above.
[0019] The beneficial effects of this application are:
[0020] This application provides a single-cell battery, including a casing, a cell, terminals, and a current-blocking device. The cell is disposed within a cavity of the casing. The terminals are insulated from the casing and seal the end holes of the casing. The current-blocking device is disposed within the terminal hole of the terminal and includes an electrically connected portion and a current-blocking portion electrically connected to each other. The electrically connected portion is electrically connected to the terminal, and the current-blocking portion is located between the electrically connected portion and the cell and electrically connected to the cell. The current-blocking portion is insulated from the terminal and can block or reduce the current between the cell and the terminal under preset conditions. Thus, when the single-cell battery is normal and the preset conditions are not met, the cell is electrically connected to the terminal through the current-blocking device, and the current can flow normally between the cell and the terminal. When the single-cell battery malfunctions, such as an external short circuit, cell overheating, or cell overcurrent, the preset conditions are met, and the current-blocking device can block or reduce the current between the cell and the terminal, reducing safety hazards and thus improving the safety of the single-cell battery.
[0021] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0022] 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.
[0023] Figure 1 The following are schematic diagrams of the structure of a single cell in some embodiments of this application;
[0024] Figure 2 It shows Figure 1 A schematic diagram of the three-dimensional sectional structure at point AA;
[0025] Figure 3 It shows Figure 1 A partial three-dimensional sectional view of section AA in the middle;
[0026] Figure 4 It shows Figure 3 A magnified structural diagram of region B in the middle;
[0027] Figure 5 It shows Figure 1 Another partial three-dimensional sectional view of the structure at point AA;
[0028] Figure 6 A schematic diagram of the assembly structure of the current blocking element and the first insulating element in some embodiments of this application is shown;
[0029] Figure 7 Schematic diagrams of the current blocking device in some embodiments of this application are shown;
[0030] Figure 8 The following are schematic diagrams illustrating the structure of the first insulating element in some embodiments of this application;
[0031] Figure 9 This application shows schematic diagrams of the assembly structure of the pole and the insulating layer in some embodiments;
[0032] Figure 10 The diagram shows a schematic representation of the pole post structure in some embodiments of this application;
[0033] Figure 11 Schematic diagrams of the structure of a single cell are shown in some other embodiments of this application.
[0034] Explanation of key component symbols:
[0035] 100 - Single cell; 110 - Cell; 120 - Casing; 121 - Shell; 1211 - Receiving cavity; 122 - First end plate; 1221 - End hole; 123 - Second end plate; 130 - Terminal post; 131 - First terminal post portion; 132 - Second terminal post portion; 133 - Third terminal post portion; 1331 - Terminal post hole; 1332 - First clearance groove; 1333 - Second clearance groove; 1334 - Gap; 140 - Second insulating component; 141 - First insulating part; 142 - Second insulating part; 150 - Current blocking component; 151 - Electrical connection part; 152 - Welded part; 153 - Current blocking part; 160 - First insulating component; 170 - Third insulating component; 180 - Current collector. Detailed Implementation
[0036] The embodiments of this application are described in detail below. Examples of the 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.
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] like Figure 1 As shown, in the first aspect, embodiments of this application provide a single battery cell 100, which relates to the field of battery technology and is mainly used in battery packs, so as to be used in electrical devices such as new energy vehicles, ships, and spacecraft in the form of battery packs. Of course, the single battery cell 100 can also be used directly in electrical devices without adopting the form of battery packs.
[0042] Combination Figures 2 to 4 As shown, the single-cell battery 100 provided in this embodiment includes: a casing 120, a cell 110, a terminal post 130, and a current blocking component 150.
[0043] The outer casing 120 has a receiving cavity 1211 and an end hole 1221 communicating with the receiving cavity 1211. The battery cell 110 is disposed in the receiving cavity 1211. The terminal post 130 is insulated from the outer casing 120 and closes the end hole 1221. The terminal post 130 has a terminal post hole 1331 that passes through it. A current blocking component 150 is disposed in the terminal post hole 1331. The current blocking component 150 includes an electrical connection part 151 and a current blocking part 153 electrically connected to the electrical connection part 151. The electrical connection part 151 is electrically connected to the terminal post 130. The current blocking part 153 is located between the electrical connection part 151 and the battery cell 110. The current blocking part 153 is electrically connected to the battery cell 110 and is insulated from the terminal post 130. The current blocking part 153 can block or reduce the current between the battery cell 110 and the terminal post 130 under preset conditions.
[0044] It is understood that the single battery 100 provided in this embodiment includes a casing 120, a battery cell 110, a terminal post 130, and a current blocking component 150. The battery cell 110 is disposed in the receiving cavity 1211 of the casing 120. The terminal post 130 is insulated from the casing 120 and closes the end hole 1221 of the casing 120. The current blocking component 150 is disposed in the terminal hole 1331 of the terminal post 130 and includes an electrical connection part 151 and a current blocking part 153 that are electrically connected to each other. The electrical connection part 151 is electrically connected to the terminal post 130. The current blocking part 153 is located between the electrical connection part 151 and the battery cell 110 and is electrically connected to the battery cell 110. The current blocking part 153 is insulated from the terminal post 130 and can block or reduce the current between the battery cell 110 and the terminal post 130 under preset conditions. Thus, when the individual battery 100 is functioning normally and the preset conditions are not met, the cell 110 is electrically connected to the terminal 130 through the current blocking device 150, allowing current to flow normally between the cell 110 and the terminal 130. When the individual battery 100 malfunctions, such as due to an external short circuit, overheating of the cell 110, or overcurrent in the cell 110, and the preset conditions are met, the current blocking device 150 can block or reduce the current between the cell 110 and the terminal 130, reducing safety hazards and thus improving the safety of the individual battery 100.
[0045] It should be noted that the terminal 130 is insulated from the outer casing 120, and the current blocking part 153 is insulated from the terminal 130. This is to ensure that the current flows directionally between the cell 110 and the terminal 130 according to a preset path. In other words, the current can only flow directionally between the cell 110 and the terminal 130 via the current blocking part 153 and the electrical connection part 151. This improves the current blocking effect of the current blocking part 153 when an abnormality occurs in the individual battery cell 100. The preset conditions can be set based on the specifications of the individual battery cell 100 or the operating environment. For example, the preset condition could be that the temperature of the current blocking part 153 reaches above 100°C, causing the current blocking part 153 to quickly cut off or significantly reduce the current between the cell 110 and the terminal 130, thereby preventing further deterioration of the situation.
[0046] For example, the terminal 130 can be a positive terminal, in which case the positive terminal serves as the positive electrode of the single cell 100, and the casing 120 serves as the negative electrode of the single cell 100. Of course, the terminal 130 can also be a negative terminal, in which case the negative terminal serves as the negative electrode of the single cell 100, and the casing 120 serves as the positive electrode of the single cell 100. No specific restrictions are placed on the type of terminal 130 here.
[0047] like Figure 3 , Figure 4 and Figure 8 As shown, in one embodiment, a gap 1334 exists between the current blocking part 153 and the hole wall of the terminal post 1331. The single cell 100 also includes a first insulating member 160, which is located within the gap 1334 and is disposed around the outer periphery of the current blocking part 153. It is understood that the first insulating member 160 electrically isolates the current blocking part 153 and the terminal post 130, ensuring that the terminal post 130 and the current blocking part 153 are mutually insulated, allowing current to flow directionally between the cell 110 and the terminal post 130 according to a preset path, thereby ensuring that the current blocking part 153 can block the current when preset conditions are met.
[0048] like Figure 3 and Figure 4As shown, further, a first clearance groove 1332 is provided on the electrode post 130. The first clearance groove 1332 is opened along the circumference of the electrode post 130 on the hole wall of the electrode post hole 1331, and the opening of the first clearance groove 1332 faces the circumferential wall of the current blocking part 153 near the cell 110. The opening of the first clearance groove 1332 can increase the distance between the end of the current blocking part 153 facing the cell 110 and the end of the electrode post 130 facing the cell 110, thereby preventing the current blocking part 153 and the electrode post 130 from making contact and conducting near the cell 110. This ensures that the current can only be conducted sequentially along the path of the current blocking part 153, the electrical connection part 151, and the electrode post 130 after the cell 110, ensuring that the current blocking part 153 can cut off or greatly reduce the current when a preset situation occurs.
[0049] like Figure 3 and Figure 4 As shown, in one embodiment, the single-cell battery 100 further includes a current collector 180, with the terminal post 130 insulated from the current collector 180. The current collector 180 is electrically connected between the cell 110 and the current blocking part 153. It is understood that by insulating the terminal post 130 from the current collector 180, the current can flow directionally between the cell 110 and the terminal post 130 according to a preset path. Thus, when an abnormality occurs in the single-cell battery 100, the current blocking part 153 can more effectively block or significantly reduce the current, resulting in a better blocking effect.
[0050] like Figure 3 and Figure 4 As shown, further, a second clearance groove 1333 is formed on the end face of the electrode 130 facing the cell 110. The second clearance groove 1333 is arranged in a ring shape and communicates with the electrode hole 1331. It can be understood that the arrangement of the second clearance groove 1333 is used to avoid the current blocking part 153 and the current collector 180, so that the electrode 130 and the current blocking part 153 have a better insulation effect with each other and the electrode 130 and the current collector 180 with each other, so as to further improve the blocking effect of the current blocking part 153 when the preset conditions are met, and prevent the current of the cell 110 from bypassing the current blocking part 153 and directly reaching the electrode 130.
[0051] like Figure 3 and Figure 4 As shown, the single cell 100 also includes a welding component 152, which is welded between the current blocking part 153 and the current collector 180 to make the current blocking part 153 and the current collector 180 conductive. It can be understood that the welding component 152 facilitates the electrical connection between the current blocking part 150 and the current collector 180, thereby realizing the electrical connection between the terminal 130, the current blocking part 150 and the cell 110.
[0052] Alternatively, the weldment 152 may be a welded piece or a welded ring to facilitate the electrical connection between the current blocking part 153 and the current collector 180. The material of the weldment 152 may be the same as that of the current collector 180 for ease of welding.
[0053] like Figure 4 , Figure 6 and Figure 7 As shown, further, the electrical connection 151, the welded part 152, and the current blocking part 153 are all cylindrical, and the pole hole 1331 is a circular hole. The diameter of the electrical connection 151 is less than or equal to the diameter of the pole hole 1331, so as to facilitate the assembly of the current blocking part 150 into the pole hole 1331. The diameter of the welded part 152 is less than the diameter of the electrical connection 151, which can reduce the possibility of insulation failure between the welded part 152 and the pole 130, so that the current can flow in a predetermined path between the cell 110 and the pole 130. The diameter of the welded part 152 is greater than the diameter of the current blocking part 153, which can give the welded part 152 and the current collector 180 better electrical connection stability. For example, when welding is used, the welded part 152 and the current collector 180 can be fully welded, resulting in higher connection strength and stability.
[0054] When the weldment 152 is a cylinder, it can be a circular weldment piece. In one embodiment, the weldment 152 can also be integrated into the current blocking component 150, so that the weldment 152 and the current blocking part 153 are integrally disposed. In this case, the weldment 152 can be directly welded to the current collector 180 to realize the conduction between the current collector 180 and the current blocking part 153.
[0055] Furthermore, the first insulating member 160 is a circular sleeve, and the inner circumferential diameter of the first insulating member 160 is equal to or approximately equal to the outer diameter of the current blocking part 153, and the outer circumferential diameter of the first insulating member 160 is equal to or approximately equal to the diameter of the hole 1331 of the pole post 130, so as to achieve better matching.
[0056] In one embodiment, the current blocking part 153 is a positive temperature coefficient thermistor (PTC thermistor). It is understood that as the temperature increases, the resistance value of the PTC thermistor increases, thereby reducing or interrupting the current, i.e., blocking the electrical connection between the cell 110 and the terminal 130. As the temperature decreases, the resistance value of the PTC thermistor decreases, and the effect of reducing or interrupting the current decreases. Thus, when the single-cell battery 100 malfunctions, the current blocking part 150 can block or reduce the current between the cell 110 and the terminal 130, thereby improving safety; when the single-cell battery 100 recovers from the malfunction, the cell 110 and the terminal 130 are restored to an electrical connection, allowing the single-cell battery 100 to continue to be used.
[0057] Of course, in the above embodiment, the current blocking part 153 can also be a fuse. When the single cell 100 malfunctions, the fuse will trip, thereby cutting off the current and blocking the electrical connection between the cell 110 and the terminal 130, which can also improve the safety of the single cell 100. No specific limitation is made on the type of current blocking part 153 here.
[0058] like Figure 11 As shown, in one embodiment, the outer casing 120 includes a housing 121, a first end plate 122, and a second end plate 123. The housing 121 is cylindrical. The first end plate 122 and the second end plate 123 respectively cover both ends of the housing 121 along the cylindrical axis to form a receiving cavity 1211. Both the first end plate 122 and the second end plate 123 are provided with end holes 1221 and terminals 130. The terminal 130 on the first end plate 122 is the positive terminal, and the terminal 130 on the second end plate 123 is the negative terminal. It can be understood that by providing current blocking elements 150 on the positive terminal side and the negative terminal side respectively, when the single battery 100 malfunctions, it can block or reduce the current on the positive and negative terminals respectively, thereby further improving the safety of the single battery 100.
[0059] like Figure 1 , Figure 2 and Figure 5As shown, in another embodiment, the housing 120 includes a housing 121 and a first end plate 122. The first end plate 122 is provided with an end hole 1221 and a terminal post 130, and the terminal post 130 is a positive terminal post to serve as the positive electrode of the single cell 100. The first end plate 122 is connected to one end of the housing 121, and the housing 121 is electrically connected to the end of the cell 110 away from the terminal post 130 to serve as the negative electrode of the single cell 100. It can be understood that when the single cell 100 malfunctions, the current blocking device 150 can block or reduce the current on the positive side to improve the safety of the single cell 100.
[0060] like Figure 2 , Figure 3 and Figure 10 As shown, in one embodiment, the terminal 130 includes a first terminal portion 131, a second terminal portion 132, and a third terminal portion 133 connected between the first terminal portion 131 and the second terminal portion 132. A terminal hole 1331 passes through the first terminal portion 131, the second terminal portion 132, and the third terminal portion 133, respectively. The first terminal portion 131 is electrically connected to the electrical connection portion 151, and the second terminal portion 132 is insulated from the battery cell 110. The single-cell battery 100 also includes a second insulating member 140, which is connected to the outer casing 120, the first terminal portion 131, the second terminal portion 132, and the third terminal portion 133, respectively. It is understood that the first terminal portion 131 facilitates the electrical connection between the terminal 130 and the current blocking member 150. The second insulating member 140 is connected to the outer shell 120, the first pole post 131, the second pole post 132 and the third pole post 133 respectively, thereby achieving insulation between the pole post 130 and the outer shell 120, so that the pole post 130 and the outer shell 120 have different polarities.
[0061] like Figure 3 and Figure 10 As shown, exemplarily, the edge of the terminal hole 1331 away from the battery cell 110 is welded to the edge of the electrical connection portion 151 away from the battery cell 110. It can be understood that the electrical connection between the electrical connection portion 151 and the terminal 130 is achieved through welding. Of course, it can also be achieved through screw connection, snap-fit, abutment, etc., and no specific limitation is made here regarding the electrical connection method between the electrical connection portion 151 and the terminal 130.
[0062] like Figure 2 , Figure 3 and Figure 9As shown, the current collector 180 is located within the receiving cavity 1211. The welded part 152 connects the current collector 180 to the current blocking part 153, thereby connecting the terminal 130 to the battery cell 110. A third insulating part 170 is provided on the second terminal 132 and / or the current collector 180 to achieve insulation between the second terminal 132 and the current collector 180. It can be understood that the third insulating part 170 can achieve insulation between the current collector 180 and the terminal 130, allowing the current to flow directionally between the battery cell 110 and the terminal 130 according to a preset path, thereby improving the current blocking effect of the current blocking part 150 and preventing the current of the battery cell 110 from bypassing the current blocking part 153 and being discharged directly through the terminal 130.
[0063] For example, the third insulating element 170 may be an insulating coating or insulating sheet coated on the pole 130 (e.g., the second pole portion 132), and there is no specific limitation on the type of the third insulating element 170.
[0064] It should be noted that the provision of a third insulating element 170 on the second electrode post 132 and / or current collector 180 means that the third insulating element 170 can be provided on the end face of the second electrode post 132 facing the current collector 180, or on the side of the current collector 180 facing the second electrode post 132. Alternatively, the third insulating element 170 can be provided on both the end face of the second electrode post 132 facing the current collector 180 and the side of the current collector 180 facing the second electrode post 132. All three methods ensure that the electrode post 130 is insulated from the current collector 180, allowing the current to flow directionally between the cell 110 and the electrode post 130 according to a preset path.
[0065] like Figure 2 and Figure 3As shown, the second insulating member 140 further includes a first insulating portion 141 and a second insulating portion 142. The first insulating portion 141 is located outside the receiving cavity 1211 and is connected to the outer shell 120, the first terminal portion 131, and the third terminal portion 133, respectively. The second insulating portion 142 is located inside the receiving cavity 1211 and is connected to the second terminal portion 132 and the outer shell 120, respectively. It can be understood that the first insulating portion 141 provides insulation between the first terminal portion 131 and the outer shell 120, as well as between the second terminal portion 132 and the outer shell 120. The second insulating portion 142 provides insulation between the third terminal portion 133 and the outer shell 120. This achieves insulation between the terminal 130 and the outer casing 120, allowing the current to flow directionally between the cell 110 and the terminal 130 according to a preset path. In other words, the current can only flow directionally between the cell 110 and the terminal 130 through the current blocking part 153 and the electrical connection part 151. Thus, when the single cell 100 malfunctions, the blocking effect of the current blocking part 153 is better.
[0066] Secondly, embodiments of this application provide a battery pack including the single battery cell 100 in any of the embodiments of the first aspect described above.
[0067] It is understood that since the battery pack provided in this embodiment has the single cell 100 in any of the embodiments of the first aspect described above, it has all the beneficial effects of the single cell 100, which will not be described in detail here.
[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.
[0069] 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: The outer casing (120) has a receiving cavity (1211) and an end hole (1221) communicating with the receiving cavity (1211); The battery cell (110) is disposed within the receiving cavity (1211); The pole post (130) is insulated from the outer shell (120) and closes the end hole (1221). The pole post (130) has a pole post hole (1331) that passes through it. A current blocking component (150) is disposed within the electrode post hole (1331). The current blocking component (150) includes an electrical connection portion (151) and a current blocking portion (153) electrically connected to the electrical connection portion (151). The electrical connection portion (151) is electrically connected to the electrode post (130). The current blocking portion (153) is located between the electrical connection portion (151) and the battery cell (110). The current blocking portion (153) is electrically connected to the battery cell (110) and is insulated from the electrode post (130). The current blocking portion (153) can block or reduce the current between the battery cell (110) and the electrode post (130) under preset conditions.
2. The single-cell battery according to claim 1, characterized in that, There is a gap (1334) between the current blocking part (153) and the hole wall of the electrode hole (1331). The single cell also includes a first insulating member (160), which is located in the gap (1334) and is disposed around the outer periphery of the current blocking part (153).
3. The single-cell battery according to claim 2, characterized in that, The pole post (130) is provided with a first clearance groove (1332), which is opened on the wall of the pole post hole (1331) along the circumference of the pole post (130), and the opening of the first clearance groove (1332) faces the circumferential wall of the current blocking part (153) near the cell (110).
4. The single-cell battery according to claim 1, characterized in that, The single cell also includes a current collector (180), the terminal post (130) is insulated from the current collector (180), and the current collector (180) is electrically connected between the cell (110) and the current blocking part (153).
5. The single-cell battery according to claim 4, characterized in that, A second clearance groove (1333) is provided on the end face of the electrode post (130) facing the battery cell (110). The second clearance groove (1333) is arranged in a ring shape and is connected to the electrode post hole (1331).
6. The single-cell battery according to claim 4, characterized in that, The single cell also includes a welding component (152), which is welded between the current blocking part (153) and the current collector (180) to make the current blocking part (153) and the current collector (180) conduct.
7. The single-cell battery according to claim 6, characterized in that, The electrical connection part (151), the welded part (152), and the current blocking part (153) are all cylindrical. The pole hole (1331) is a circular hole. The diameter of the electrical connection part (151) is less than or equal to the diameter of the pole hole (1331). The diameter of the welded part (152) is less than the diameter of the electrical connection part (151), and the diameter of the welded part (152) is greater than the diameter of the current blocking part (153).
8. The single-cell battery according to any one of claims 1 to 7, characterized in that, The current blocking part (153) is a positive temperature coefficient thermistor or a fuse.
9. The single-cell battery according to any one of claims 1 to 7, characterized in that, The outer casing (120) includes a shell (121), a first end plate (122), and a second end plate (123). The shell (121) is cylindrical. The first end plate (122) and the second end plate (123) are respectively covered at both ends of the shell (121) along the cylindrical axis to form a receiving cavity (1211). The end hole (1221) and the pole post (130) are provided on both the first end plate (122) and the second end plate (123). The pole post (130) located on the first end plate (122) is a positive pole post, and the pole post (130) located on the second end plate (123) is a negative pole post.
10. A battery pack, characterized in that, The single-cell battery includes any one of claims 1 to 9.