Single battery and electric device

Abstract

The application discloses a single battery and an electric device, and belongs to the technical field of batteries. The single battery comprises a shell, a cover, an electrode assembly and a current collection assembly. The shell has a containing cavity with an open top end; the cover is sealed to the opening; the electrode assembly and the current collection assembly are both arranged in the containing cavity; the electrode assembly comprises a connected roll core body, a positive full tab and a negative full tab, and the positive full tab and the negative full tab are respectively located at two ends of the roll core body; the current collection assembly comprises a positive current collection piece and a negative current collection piece; the negative current collection piece is connected with the negative full tab and an inner circumferential wall of the shell; the positive current collection piece comprises a first current collection part and a second current collection part connected with each other; the first current collection part is connected with the positive full tab; the negative current collection piece is provided with a through hole; the second current collection part is sequentially arranged in a central hole of the electrode assembly and the through hole, and is connected with the cover. The single battery provided by the application improves the structural stability and reliability, and reduces the internal resistance value of the positive and negative electrodes.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single cell battery and an electrical device. Background Technology

[0002] In related technologies, in order to improve the high-rate charge and discharge performance, structural stability and ease of connection with electrical equipment of small cylindrical lithium-ion batteries, the core usually adopts a full-tab process and uses a current collector to collect current. The cap is sealed on the top of the steel shell. The positive full tab of the core is connected to the cap through the positive current collector to serve as the positive electrode of the battery. The negative full tab of the core is connected to the bottom of the steel shell through the negative current collector and led out through the shell to the top of the steel shell to serve as the negative electrode of the battery.

[0003] However, this structural design results in two issues. First, the negative electrode tab, which has relatively lower structural strength than the positive electrode tab, is positioned at the bottom of the steel casing and bears the weight of the core. This leads to relatively low internal structural stability of the battery, making it prone to deformation when subjected to vibration and impact during use. Second, the negative electrode current flows through the entire casing, resulting in a higher overall internal resistance for both the positive and negative electrodes. This can generate a large amount of heat during charging and discharging, affecting high-rate charging and discharging performance. Utility Model Content

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a single cell battery.

[0005] To solve the above-mentioned technical problems, this application provides:

[0006] A single-cell battery, comprising:

[0007] A housing having a receiving cavity with an opening at the top;

[0008] The cover is sealed to the opening;

[0009] An electrode assembly, disposed within the receiving cavity, includes a connected core body, a positive full electrode tab, and a negative full electrode tab. The positive full electrode tab is located at the end of the core body away from the opening, and the negative full electrode tab is located at the end of the core body closer to the opening.

[0010] A current collector assembly, disposed within the receiving cavity, includes a positive current collector and a negative current collector. The negative current collector is connected to the side of the negative electrode tab away from the core body and is also connected to the inner circumferential wall of the housing. The positive current collector includes a first current collector and a second current collector connected together. The first current collector is connected to the side of the positive electrode tab away from the core body. The negative current collector has a through hole. The second current collector passes sequentially through the center hole of the electrode assembly and the through hole, and is connected to the cover.

[0011] In addition, the single cell according to this application may also have the following additional technical features:

[0012] In some embodiments of this application, the single battery cell further includes a first connector, and the second current collector is connected to the cover through the first connector.

[0013] In some embodiments of this application, the single battery cell further includes a second connector, the second current collector is connected to the second connector via the first connector, and the second connector is connected to the cover.

[0014] In some embodiments of this application, the first connector has a connecting hole that matches the shape of the second collector, the hole wall is connected to the outer peripheral wall of the second collector away from the first collector, and the side of the first connector away from the first collector is connected to the second connector.

[0015] In some embodiments of this application, the first connector is connected to the end wall of the second collector away from the first collector and the second connector respectively.

[0016] In some embodiments of this application, the first connector includes a first connecting portion, a first bent portion, and a second connecting portion connected together. The first connecting portion is connected to the end of the second current collector that is away from the first current collector, and the second connecting portion is connected to the second connector.

[0017] In some embodiments of this application, the first connector further includes a second bent portion and a third connecting portion connected together, the second bent portion being connected to the second connecting portion, and the third connecting portion being connected to the second connector.

[0018] In some embodiments of this application, the single cell further includes a heat-resistant insulating component, which is disposed between the negative current collector and the first connector, and has a clearance hole for avoiding the second current collector.

[0019] In some embodiments of this application, the heat-resistant insulating component is integrally molded from ceramic material.

[0020] In some embodiments of this application, the single battery cell further includes a sealing insulating member, which abuts against the inner circumferential wall of the housing and the outer circumferential wall of the cover, respectively.

[0021] In some embodiments of this application, the negative current collector includes a third current collector and a fourth current collector connected together. The third current collector is connected to the side of the negative full-pole tab away from the core body, and the outer peripheral wall of the fourth current collector is connected to the inner peripheral wall of the housing.

[0022] In some embodiments of this application, the negative current collector includes a third current collector and a fourth current collector connected together. The third current collector is connected to the side of the negative full electrode tab away from the core body. The inner circumferential wall of the housing is provided with an annular protrusion. The negative full electrode tab is located on the side of the annular protrusion away from the opening. The fourth current collector is connected to the side of the annular protrusion close to the opening.

[0023] In some embodiments of this application, the sealing insulation member includes a first sealing insulation portion and a second sealing insulation portion connected together. The first sealing insulation portion abuts against the inner circumferential wall of the housing and the outer circumferential wall of the cover, respectively. The second sealing insulation portion abuts against the side of the fourth current collector away from the annular protrusion and the side of the cover facing the annular protrusion, respectively.

[0024] In some embodiments of this application, the single cell further includes a supporting insulating member disposed within the receiving cavity and abutting against the bottom wall of the housing and the side of the first current collector away from the second current collector, respectively.

[0025] In some embodiments of this application, the single cell further includes a heat-resistant insulating layer, which wraps around the outer periphery of the electrode assembly away from the opening and the outer periphery of the first current collector, and is at least partially disposed between the supporting insulating member and the side of the first current collector away from the second current collector.

[0026] Secondly, this application also provides an electrical device, including the single battery described in any of the above embodiments.

[0027] Compared to existing technologies, the beneficial effects of this application are:

[0028] This application proposes a single-cell battery in which the positive electrode tab is located at the end of the core body away from the opening, and the negative electrode tab is located at the end of the core body closer to the opening. This allows the negative electrode tab, which has relatively lower structural strength, to be located at the top of the casing, while the positive electrode tab, which has relatively higher structural strength, is located at the bottom of the casing to support the entire electrode assembly. This effectively improves the structural stability and reliability of the internal structure of the single-cell battery, and prevents deformation of the internal structure of the single-cell battery due to vibration during use, thereby ensuring the stability and reliability of the electrical connection of the internal structure of the single-cell battery.

[0029] By connecting the negative current collector to the side of the negative electrode tab furthest from the core body and to the inner circumferential wall of the casing, the flow path of the negative current is shortened through the negative electrode tab, the negative current collector, and the top of the casing, effectively reducing the internal resistance of the negative electrode. Simultaneously, by connecting the first current collector to the side of the positive electrode tab furthest from the core body, and sequentially inserting the second current collector through the center hole and through hole of the electrode assembly and connecting it to the cover, the flow path of the positive current is increased through the positive electrode tab, the first current collector, the second current collector, and the cover. Although this increases the flow path of the positive current, the conductivity of the aluminum current collector is much higher than that of the steel casing, resulting in a smaller increase in the internal resistance of the positive electrode than a decrease in the internal resistance of the negative electrode. This effectively reduces the overall internal resistance of both the negative and positive electrodes, thereby reducing the heat generated by the single battery during charging and discharging, which is beneficial for high-rate charging and discharging of the single battery. Attached Figure Description

[0030] 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.

[0031] Figure 1 A perspective view of a single cell in some embodiments of this application is shown;

[0032] Figure 2 This application shows a perspective view of a single battery cell before sealing in some embodiments;

[0033] Figure 3 This application shows cross-sectional schematic diagrams of individual cells before sealing in some embodiments;

[0034] Figure 4 An exploded view of a single cell before sealing is shown in some embodiments of this application;

[0035] Figure 5 This application shows a three-dimensional schematic diagram of a single battery cell before bending at the first connector in some embodiments. Figure 1 ;

[0036] Figure 6 This application shows a three-dimensional schematic diagram of a single battery cell before bending at the first connector in some embodiments. Figure 2 .

[0037] Explanation of key component symbols:

[0038] 100-cell battery;

[0039] 110 - Shell; 111 - Receiving cavity; 112 - Opening; 113 - Annular protrusion;

[0040] 120 - Cover;

[0041] 130 - Electrode assembly; 131 - Core body; 132 - Positive electrode tab; 133 - Negative electrode tab;

[0042] 140 - Current collector assembly; 141 - Positive current collector; 1411 - First current collector section; 1412 - Second current collector section; 142 - Negative current collector; 1421 - Third current collector section; 1422 - Fourth current collector section; 1423 - Through hole;

[0043] 150 - First connector; 151 - First connecting part; 152 - First bending part; 153 - Second connecting part; 154 - Second bending part; 155 - Third connecting part; 156 - Connecting hole;

[0044] 160 - Second connector;

[0045] 170 - Heat-resistant insulating component; 171 - Clearance hole;

[0046] 180 - Sealed insulation component; 181 - First sealed insulation part; 182 - Second sealed insulation part;

[0047] 191 - Supporting insulation component; 192 - Heat-resistant insulation layer. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] like Figure 1 and Figure 2 As shown, an embodiment of this application provides a single-cell battery 100, mainly used in electronic devices. The single-cell battery 100 includes a housing 110, a cover 120, an electrode assembly 130, and a current collector assembly 140.

[0054] See also Figure 3 and Figure 4 The housing 110 has a receiving cavity 111 with a top opening 112, and the cover 120 seals the opening 112. The electrode assembly 130 is disposed in the receiving cavity 111 and includes a connected core body 131, a positive full electrode tab 132 and a negative full electrode tab 133. The positive full electrode tab 132 is located at the end of the core body 131 away from the opening 112, and the negative full electrode tab 133 is located at the end of the core body 131 near the opening 112.

[0055] The current collector assembly 140 is disposed in the receiving cavity 111 and includes a positive current collector 141 and a negative current collector 142. The negative current collector 142 is connected to the side of the negative full electrode tab 133 away from the core body 131 and is connected to the inner circumferential wall of the housing 110. The positive current collector 141 includes a first current collector 1411 and a second current collector 1412 connected together. The first current collector 1411 is connected to the side of the positive full electrode tab 132 away from the core body 131. The negative current collector 142 has a through hole 1423. The second current collector 1412 passes through the center hole and the through hole 1423 of the electrode assembly 130 in sequence and is connected to the cover 120.

[0056] The single-cell battery 100 provided in the embodiments of this application has a housing 110 with a receiving cavity 111 having a top opening 112, a cover 120 sealing the opening 112, and an electrode assembly 130 disposed within the receiving cavity 111. The electrode assembly 130 includes a connected core body 131, a positive electrode tab 132, and a negative electrode tab 133. By placing the positive electrode tab 132 at the end of the core body 131 away from the opening 112 and placing the negative electrode tab 133 at the end of the core body 131 near the opening 112, the relatively low-strength negative electrode tab 133 is positioned at the top of the housing 110, while the relatively high-strength positive electrode tab 132 is positioned at the bottom of the housing 110 to support the entire electrode assembly 130. This effectively improves the structural stability and reliability of the internal structure of the single-cell battery 100, prevents deformation of the internal structure of the single-cell battery 100 due to vibration during use, and thus ensures the stability and reliability of the electrical connections within the internal structure of the single-cell battery 100.

[0057] It is understandable that the positive electrode tab 132 is usually made of aluminum foil, and the negative electrode tab 133 is usually made of copper foil. Although the hardness of aluminum is lower than that of copper, the thickness of the positive electrode tab 132 is usually much thicker than that of the negative electrode tab 133. Therefore, the structural strength of the positive electrode tab 132 is higher than that of the negative electrode tab 133.

[0058] The current collector assembly 140 is disposed in the receiving cavity 111. The current collector assembly 140 includes a positive current collector 141 and a negative current collector 142. By connecting the negative current collector 142 to the side of the negative full-pole tab 133 away from the core body 131 and connecting it to the inner circumferential wall of the housing 110, the flow path of the negative current is the negative full-pole tab 133, the negative current collector 142 and the top of the housing 110, which effectively shortens the flow path of the negative current on the housing 110, thereby reducing the internal resistance of the negative electrode.

[0059] Meanwhile, the positive current collector 141 includes a first current collector 1411 and a second current collector 1412 connected together, and the negative current collector 142 has a through hole 1423. By connecting the first current collector 1411 to the side of the positive electrode tab 132 away from the core body 131, and by sequentially passing the second current collector 1412 through the center hole and the through hole 1423 of the electrode assembly 130 and connecting it to the cover 120, the flow path of the positive current is the positive electrode tab 132, the first current collector 1411, the second current collector 1412, the negative current collector 1423, and the negative current collector 1412. The current collector 1411, the second current collector 1412, and the cover 120, although increasing the flow path of the positive current, have a higher conductivity than the steel casing 110, even though the positive current collector 141 is made of aluminum. This results in the increased internal resistance of the positive electrode being less than the decreased internal resistance of the negative electrode, effectively reducing the overall internal resistance of both the positive and negative electrodes. Consequently, this reduces the heat generated by the single cell 100 during charging and discharging, which is beneficial for high-rate charging and discharging of the single cell 100.

[0060] For example, the single battery 100 can be a lithium-ion battery with a diameter of 32mm or less. The casing 110 can be made of steel. The positive electrode tab 132, the positive electrode current collector 141, and the cover 120 can all be made of aluminum. The negative electrode tab 133 and the negative electrode current collector 142 can both be made of copper. The connection between the negative electrode current collector 142 and the negative electrode tab 133 and the inner circumferential wall of the casing 110 can all be laser welded. The connection between the first current collector 1411 and the second current collector 1412 can be laser welded or integrally formed. The connection between the first current collector 1411 and the positive electrode tab 132 can be laser welded, and the connection between the second current collector 1412 and the cover 120 can be laser welded.

[0061] like Figure 3 and Figure 4 As shown, in one embodiment of this application, the single cell 100 further includes a first connector 150, and the second current collector 1412 is connected to the cover 120 through the first connector 150.

[0062] In this embodiment, the end of the second current collector 1412 away from the first current collector 1411 is connected to the cover 120 through the first connector 150 to achieve electrical conduction between the second current collector 1412 and the cover 120.

[0063] For example, the first connector 150 can be made of aluminum, and the first connector 150 is laser welded to the end of the second current collector 1412 away from the first current collector 1411 and the cover 120 respectively.

[0064] like Figure 3 and Figure 4As shown in the above embodiments of this application, the single cell battery 100 further includes a second connector 160, the second current collector 1412 is connected to the second connector 160 through the first connector 150, and the second connector 160 is connected to the cover 120.

[0065] In this embodiment, the end of the second current collector 1412 away from the first current collector 1411 is connected to the second connector 160 through the first connector 150, and the second connector 160 is connected to the cover 120 to realize electrical conduction between the second current collector 1412 and the cover 120.

[0066] For example, the second connector 160 can be made of aluminum, and the second connector 160 is laser-welded to the first connector 150 and the cover 120 respectively. The second connector 160 can be a current cutting-off device. When the internal pressure of the single cell 100 increases due to overheating, short circuit or overcharging, the weld points welded to the aluminum plate and the pressure relief plate fall off, the pressure relief plate flips and cuts off the positive electrode lead to form an open circuit, thereby preventing the pressure from continuing to rise and causing electrolyte leakage or explosion, thus ensuring the safety performance of the single cell 100.

[0067] like Figure 3 , Figure 4 and Figure 5 As shown in the above embodiment of this application, the first connector 150 has a connecting hole 156 that is adapted to the shape of the second collector 1412. The hole wall of the connecting hole 156 is connected to the outer peripheral wall of the end of the second collector 1412 away from the first collector 1411. The side of the first connector 150 away from the first collector 1411 is connected to the second connector 160.

[0068] In this embodiment, a connecting hole 156 adapted to the shape of the second current collector 1412 is opened on the first connector 150, and the hole wall of the connecting hole 156 is connected to the outer peripheral wall of the end of the second current collector 1412 away from the first current collector 1411. This creates an annular gap between the hole wall of the connecting hole 156 and the outer peripheral wall of the first current collector 1411, so as to achieve a stable connection between the two by laser welding of the positioning seam, which helps to improve welding accuracy and welding efficiency.

[0069] like Figure 3 , Figure 4 and Figure 6 As shown, in the above embodiments of this application, the first connector 150 is connected to the end wall of the second collector 1412 away from the first collector 1411 and the second connector 160.

[0070] In this embodiment, by connecting the first connector 150 to the end wall of the second current collector 1412 away from the first current collector 1411 and the second connector 160 respectively, a stable connection can be achieved by laser welding through penetration welding, which helps to improve welding stability and reliability.

[0071] For example, such as Figure 3 and Figure 4 As shown, in some embodiments of this application, the first connector 150 includes a first connecting portion 151, a first bending portion 152 and a second connecting portion 153 connected together. The first connecting portion 151 is connected to the end of the second current collector 1412 away from the first current collector 1411, and the second connecting portion 153 is connected to the second connector 160.

[0072] The first connecting part 151, the first bending part 152 and the second connecting part 153 are integrally bent and formed. The first connecting part 151 can be connected to the end of the second current collector 1412 away from the first current collector 1411 by laser welding. The second connecting part 153 can be connected to the second connecting member 160 by laser welding.

[0073] In other embodiments of this application, such as Figure 3 and Figure 4 As shown in the above embodiments of this application, the first connector 150 further includes a second bent portion 154 and a third connecting portion 155 connected together. The second bent portion 154 is connected to the second connecting portion 153, and the third connecting portion 155 is connected to the second connector 160.

[0074] The first connecting part 151, the first bending part 152, the second connecting part 153, the second bending part 154 and the third connecting part 155 are integrally bent and formed, and the third connecting part 155 can be connected to the second connecting part 160 by laser welding.

[0075] like Figure 3 and Figure 4 As shown in the above embodiments of this application, the single cell 100 further includes a heat-resistant insulating member 170, which is disposed between the negative current collector 142 and the first connector 150, and has an avoidance hole 171 for avoiding the second current collector 1412.

[0076] In this embodiment, a heat-resistant insulating component 170 is provided between the negative current collector 142 and the first connector 150. This serves two purposes: firstly, the heat-resistant insulating component 170 isolates the electrical gap between the negative current collector 142 and the first connector 150, preventing contact between the negative current collector 142 and the first connector 150 from causing an internal short circuit in the single cell 100; secondly, the heat-resistant insulating component 170 is protected from melting by the high temperature generated during the high-rate charging and discharging of the single cell 100, thereby ensuring the stability and reliability of the insulation effect.

[0077] Meanwhile, by providing a clearance hole 171 on the heat-resistant insulating part 170 to avoid the second current collector 1412, the second current collector 1412 can pass through the center hole, through hole 1423 and clearance hole 171 of the electrode assembly 130 in sequence to connect with the first connector 150.

[0078] For example, in the above embodiments of this application, the heat-resistant insulating component 170 is integrally molded from ceramic material.

[0079] like Figure 3 and Figure 4 As shown, in one embodiment of this application, the single cell 100 further includes a sealing and insulating member 180, which abuts against the inner peripheral wall of the housing 110 and the outer peripheral wall of the cover 120, respectively.

[0080] In this embodiment, by providing a sealing and insulating member 180 that abuts against the inner circumferential wall of the housing 110 and the outer circumferential wall of the cover 120 respectively, on the one hand, the electrical gap between the housing 110 and the cover 120 can be isolated by the insulating effect of the sealing and insulating member 180, preventing the housing 110 and the cover 120 from contacting and causing a short circuit. On the other hand, the gap between the inner circumferential wall of the housing 110 and the outer circumferential wall of the cover 120 can be sealed by the sealing effect of the sealing and insulating member 180, preventing external dust or water from entering the interior of the single cell 100, and preventing the electrolyte inside the single cell 100 from leaking through the gap between the housing 110 and the cover 120.

[0081] For example, the sealing insulation element 180 may be made of rubber or silicone.

[0082] In the above embodiments of this application, the negative current collector 142 includes a third current collector 1421 and a fourth current collector 1422 connected together. The third current collector 1421 is connected to the side of the negative full pole tab 133 away from the core body 131, and the outer peripheral wall of the fourth current collector 1422 is connected to the inner peripheral wall of the housing 110.

[0083] In this embodiment, by connecting the third current collector 1421 to the side of the negative electrode tab 133 away from the core body 131, and connecting the outer peripheral wall of the fourth current collector 1422 to the inner peripheral wall of the housing 110, electrical conduction between the negative electrode tab 133 and the housing 110 is achieved, thereby forming the negative electrode of the single cell 100.

[0084] For example, the third current collector 1421 and the fourth current collector 1422 are integrally bent and formed. The connection between the third current collector 1421 and the negative electrode tab 133 can be laser welding, and the connection between the fourth current collector 1422 and the housing 110 can be laser welding.

[0085] like Figure 3 and Figure 4 As shown in the above embodiments of this application, the negative current collector 142 includes a third current collector 1421 and a fourth current collector 1422 connected together. The third current collector 1421 is connected to the side of the negative full electrode tab 133 away from the core body 131. The inner circumferential wall of the housing 110 is provided with an annular protrusion 113. The negative full electrode tab 133 is located on the side of the annular protrusion 113 away from the opening 112. The fourth current collector 1422 is connected to the side of the annular protrusion 113 near the opening 112.

[0086] In this embodiment, an annular protrusion 113 is provided on the inner circumferential wall of the housing 110. The negative electrode tab 133 is located on the side of the annular protrusion 113 away from the opening 112. By connecting the third current collector 1421 to the side of the negative electrode tab 133 away from the core body 131, and connecting the fourth current collector 1422 to the side of the annular protrusion 113 near the opening 112, electrical conduction between the negative electrode tab 133 and the housing 110 is achieved, thereby forming the negative electrode of the single cell 100.

[0087] Meanwhile, the fourth current collector 1422 is connected to the side of the annular protrusion 113 near the opening 112, which effectively increases the contact area between the fourth current collector 1422 and the housing 110. On the one hand, it improves the welding stability and reliability between the negative current collector 142 and the housing 110, avoids the occurrence of phenomena such as false welding and desoldering, and ensures the stability and reliability of the electrical connection between the two. On the other hand, it can also improve the negative current capacity to achieve high-rate charging and discharging of the single cell 100.

[0088] For example, the third current collector 1421 and the fourth current collector 1422 are integrally bent and formed. The connection between the third current collector 1421 and the negative electrode tab 133 can be laser welding. The connection between the fourth current collector 1422 and the side of the annular protrusion 113 near the opening 112 can also be laser welding.

[0089] like Figure 3 and Figure 4 As shown in the above embodiments of this application, the sealing insulation member 180 includes a first sealing insulation part 181 and a second sealing insulation part 182 connected together. The first sealing insulation part 181 abuts against the inner circumferential wall of the housing 110 and the outer circumferential wall of the cover 120, respectively. The second sealing insulation part 182 abuts against the side of the fourth current collector 1422 away from the annular protrusion 113 and the side of the cover 120 facing the annular protrusion 113, respectively.

[0090] In this embodiment, the gap between the housing 110 and the cover 120 and the electrical gap between the insulating housing 110 and the cover 120 are sealed by the first sealing and insulating part 181 abutting against the inner circumferential wall of the housing 110 and the outer circumferential wall of the cover 120, respectively.

[0091] Meanwhile, by abutting the second sealing and insulating part 182 against the side of the fourth current collector 1422 away from the annular protrusion 113 and the side of the cover 120 facing the annular protrusion 113, the electrical gap between the fourth current collector 1422 and the cover 120 can be insulated and isolated, preventing short circuit caused by contact between the fourth current collector 1422 and the cover 120. On the other hand, the cover 120 can stably press the fourth current collector 1422 against the annular protrusion 113 through the second sealing and insulating part 182, thereby further ensuring the welding stability and reliability between the fourth current collector 1422 and the annular protrusion 113, avoiding phenomena such as incomplete welding and desoldering, and further ensuring the stability and reliability of the electrical connection between the two.

[0092] For example, the first sealing insulation portion 181 and the second sealing insulation portion 182 can be integrally molded from rubber or silicone material.

[0093] like Figure 3 and Figure 4 As shown, in one embodiment of this application, the single cell 100 further includes a supporting insulating member 191, which is disposed in the receiving cavity 111 and abuts against the bottom wall of the housing 110 and the side of the first current collector 1411 away from the second current collector 1412.

[0094] In this embodiment, by providing a supporting insulating member 191 in the receiving cavity 111 that abuts against the bottom wall of the housing 110 and the side of the first current collector 1411 away from the second current collector 1412, the electrical gap between the first current collector 1411 and the bottom wall of the housing 110 can be insulated and isolated by the insulating effect of the supporting insulating member 191, preventing short circuit caused by contact between the first current collector 1411 and the bottom wall of the housing 110. On the other hand, the current collector assembly 140 and the electrode assembly 130 can be supported as a whole by the supporting insulating member 191, ensuring the structural stability and reliability of the internal structure of the single cell 100.

[0095] For example, the material of the supporting insulation member 191 can be soft rubber or hard rubber.

[0096] like Figure 3 and Figure 4 As shown, in one embodiment of this application, the single cell 100 further includes a heat-resistant insulating layer 192, which wraps around the outer periphery of the electrode assembly 130 away from the opening 112 and the outer periphery of the first current collector 1411, and is at least partially disposed between the supporting insulating member 191 and the side of the first current collector 1411 away from the second current collector 1412.

[0097] Therefore, on the one hand, the insulating effect of the heat-resistant insulating layer 192 can isolate the electrical gap between the positive electrode tab 132 and the second current collector 1412 and the casing 110, preventing short circuits caused by contact between the positive electrode tab 132 and the second current collector 1412 and the casing 110. On the other hand, the high temperature resistance of the heat-resistant insulating layer 192 can also prevent the heat-resistant insulating layer 192 from melting due to the high temperature generated during the high-rate charging and discharging of the single cell 100, thereby ensuring the stability and reliability of the insulation effect.

[0098] For example, the heat-resistant insulation layer 192 can be a high-temperature resistant insulating paper.

[0099] This application also provides an electrical device, including the single battery 100 in the above embodiments.

[0100] The electrical device has the single battery 100 in any of the above embodiments, and therefore has all the beneficial effects of the single battery 100, which will not be described in detail here.

[0101] For example, electrical equipment can be vehicles, drones, robots, lawnmowers, and other electrical equipment that require high-rate charging and discharging.

[0102] 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.

[0103] 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 housing (110) has a receiving cavity (111) with a top opening (112). A cover (120) is sealed to the opening (112). An electrode assembly (130) is disposed within the receiving cavity (111) and includes a connected core body (131), a positive electrode tab (132), and a negative electrode tab (133). The positive electrode tab (132) is located at the end of the core body (131) away from the opening (112), and the negative electrode tab (133) is located at the end of the core body (131) close to the opening (112). A current collector assembly (140) is disposed in the receiving cavity (111) and includes a positive current collector (141) and a negative current collector (142). The negative current collector (142) is connected to the side of the negative electrode tab (133) away from the core body (131) and is connected to the inner circumferential wall of the housing (110). The positive current collector (141) includes a first current collector (1411) and a second current collector (1412) connected together. The first current collector (1411) is connected to the side of the positive electrode tab (132) away from the core body (131). The negative current collector (142) has a through hole (1423). The second current collector (1412) is sequentially inserted through the center hole of the electrode assembly (130) and the through hole (1423) and is connected to the cover (120).

2. The single-cell battery according to claim 1, characterized in that, The single battery cell (100) also includes a first connector (150), and the second current collector (1412) is connected to the cover (120) through the first connector (150).

3. The single-cell battery according to claim 2, characterized in that, The single battery cell (100) also includes a second connector (160), the second current collector (1412) is connected to the second connector (160) through the first connector (150), and the second connector (160) is connected to the cover (120).

4. The single-cell battery according to claim 3, characterized in that, The first connector (150) has a connecting hole (156) that matches the shape of the second collector (1412). The wall of the connecting hole (156) is connected to the outer peripheral wall of the second collector (1412) away from the first collector (1411). The side of the first connector (150) away from the first collector (1411) is connected to the second connector (160).

5. The single-cell battery according to claim 3, characterized in that, The first connector (150) is connected to the end wall of the second collector (1412) away from the first collector (1411) and the second connector (160).

6. The single-cell battery according to claim 3, characterized in that, The first connector (150) includes a first connecting part (151), a first bending part (152), and a second connecting part (153) connected together. The first connecting part (151) is connected to the end of the second current collector (1412) away from the first current collector (1411), and the second connecting part (153) is connected to the second connector (160).

7. The single-cell battery according to claim 6, characterized in that, The first connector (150) further includes a second bent portion (154) and a third connecting portion (155) connected together, the second bent portion (154) being connected to the second connecting portion (153), and the third connecting portion (155) being connected to the second connector (160).

8. The single-cell battery according to claim 3, characterized in that, The single cell (100) also includes a heat-resistant insulating component (170), which is disposed between the negative current collector (142) and the first connector (150) and has an avoidance hole (171) for avoiding the second current collector (1412).

9. The single-cell battery according to claim 8, characterized in that, The heat-resistant insulating component (170) is made of ceramic material in one piece.

10. The single-cell battery according to claim 1, characterized in that, The single cell (100) also includes a sealing insulation component (180), which abuts against the inner circumferential wall of the housing (110) and the outer circumferential wall of the cover (120), respectively.

11. The single-cell battery according to claim 10, characterized in that, The negative current collector (142) includes a third current collector (1421) and a fourth current collector (1422) connected together. The third current collector (1421) is connected to the side of the negative full pole tab (133) away from the core body (131). The outer peripheral wall of the fourth current collector (1422) is connected to the inner peripheral wall of the housing (110).

12. The single-cell battery according to claim 10, characterized in that, The negative current collector (142) includes a third current collector (1421) and a fourth current collector (1422) connected together. The third current collector (1421) is connected to the negative full electrode tab (133) on the side away from the core body (131). The inner circumferential wall of the housing (110) is provided with an annular protrusion (113). The negative full electrode tab (133) is located on the side of the annular protrusion (113) away from the opening (112). The fourth current collector (1422) is connected to the side of the annular protrusion (113) close to the opening (112).

13. The single-cell battery according to claim 12, characterized in that, The sealing insulation component (180) includes a first sealing insulation portion (181) and a second sealing insulation portion (182) connected together. The first sealing insulation portion (181) abuts against the inner circumferential wall of the housing (110) and the outer circumferential wall of the cover (120), respectively. The second sealing insulation portion (182) abuts against the side of the fourth current collector (1422) away from the annular protrusion (113) and the side of the cover (120) facing the annular protrusion (113), respectively.

14. The single-cell battery according to claim 1, characterized in that, The single cell (100) also includes a supporting insulating member (191), which is disposed in the receiving cavity (111) and abuts against the bottom wall of the housing (110) and the side of the first current collector (1411) away from the second current collector (1412).

15. The single-cell battery according to claim 14, characterized in that, The single cell (100) further includes a heat-resistant insulating layer (192), which wraps around the outer periphery of the electrode assembly (130) away from the opening (112) and the outer periphery of the first current collector (1411), and is at least partially disposed between the supporting insulating member (191) and the side of the first current collector (1411) away from the second current collector (1412).

16. An electrical appliance, characterized in that, Includes the single cell (100) according to any one of claims 1 to 15.

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