Battery and power consuming device

Abstract

The application discloses a battery and a power consumption device. The battery comprises a shell, an electrode assembly, a first conductive member and a current collecting plate. The shell has a first outer surface perpendicular to a first direction. An end of the electrode assembly is provided with a flattening part having a flattening surface. The current collecting plate comprises a main body part connected to the flattening surface and an extension part arranged between the main body part and the first conductive member and connecting the main body part and the first conductive member. The extension part is folded back to form n layers of structures stacked along the first direction, wherein n is a positive integer greater than or equal to 2, and the average thickness of each layer of structure in the main body part and the extension part is b. In the first direction, the distance between the first outer surface and the flattening surface is F, and F / 5≤(n+1)*b≤F / 3. The electrode assembly, the current collecting plate, the first conductive member and the shell are in interference assembly, which is beneficial to improving the stability of the connection between the electrode assembly, the current collecting plate, the first conductive member and the shell and improving the anti-shock performance of the battery.

Description

Technical Field

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

[0002] Currently, cylindrical or prismatic batteries have a fixed shape. When they are vibrated or dropped, the internal electrolyte may shake and impact, causing internal structural components to shift, which could lead to short circuits or open circuits and affect the normal use of cylindrical or prismatic batteries. Summary of the Invention

[0003] In view of the above situation, it is necessary to provide a battery that improves the connection stability of its internal structure and enhances the battery's shock resistance.

[0004] This application provides a battery including a casing, an electrode assembly, a first conductive element, and a current collector. The electrode assembly, the first conductive element, and the current collector are disposed within the casing. The casing has a first outer surface perpendicular to a first direction, and the first conductive element is connected to the casing. The electrode assembly is arranged along the first outer surface in the first direction. The end of the electrode assembly along the first direction has a flattened portion with a flattened surface. The current collector includes a main body and an extension connected to the flattened surface. The main body is connected to the flattened surface, and the extension is folded back between the main body and the first conductive element, connecting the main body and the first conductive element. The extension is folded back to form an n-layer structure, and the n-layer structure is stacked along the first direction, where n is a positive integer ≥ 2. The average thickness of each layer in the main body and the extension is b. Along the first direction, the distance between the first outer surface and the flattened surface is F, where F / 5 ≤ (n+1)*b ≤ F / 3.

[0005] In the battery described above, the flattened part, the current collector, and the first conductive element are connected sequentially along the first direction. By controlling the relationship between the distance between the first outer surface and the flattened surface and the thickness of the current collector along the first direction to satisfy F / 5≤(n+1)*b≤F / 3, the electrode assembly, the current collector, the first conductive element, and the outer shell form an interference fit, which helps to improve the stability of the connection between the electrode assembly, the current collector, the first conductive element, and the outer shell, and improves the shock resistance of the battery.

[0006] In some embodiments of this application, 7F / 30≤(n+1)*b≤4F / 15, which is beneficial to further improve the stability of the connection between the electrode assembly, current collector, first conductive element and casing, and improve the shock resistance of the battery.

[0007] In some embodiments of this application, 0.1mm≤b≤5mm is beneficial to balance the structural strength and current carrying capacity of the collector plate, thereby improving its current carrying capacity while ensuring that the collector plate has sufficient strength.

[0008] In some embodiments of this application, 0.5mm≤b≤2mm is beneficial to further balance the structural strength and current carrying capacity of the collector plate.

[0009] In some embodiments of this application, along the first direction, in the n-layer structure, two adjacent layers are in contact with each other, which is beneficial to increase the current-carrying area of ​​the current collector, reduce the electronic impedance of the current collector, improve the current-carrying capacity of the current collector, and improve the charging and discharging performance of the battery.

[0010] In some embodiments of this application, the first conductive element has a first surface, and the first surface and the kneading plane face each other along a first direction; the n-layer structure has a second surface, and the second surface is in contact with the first surface; the main body has a third surface, and the third surface is in contact with the kneading plane; along the first direction, the projected area of ​​the region where the second surface connects with the first surface is S1, and the projected area of ​​the region where the third surface connects with the kneading plane is S2, 0.5≤S1 / S2≤1.5, which is beneficial to improving the stability of the connection between the electrode assembly, the current collector, the first conductive element and the shell, and also beneficial to improving the structural strength of the current collector, reducing the risk of damage to the current collector due to shaking or impact, and improving the shock resistance of the battery.

[0011] In some embodiments of this application, 0.8≤S1 / S2≤1.2 is beneficial to further improve the stability of the connection between the electrode assembly, the current collector, the first conductive element and the outer casing, and also beneficial to improve the structural strength of the current collector, reduce the risk of damage to the current collector due to shaking or impact, and improve the shock resistance of the battery.

[0012] In some embodiments of this application, the first conductive element further includes a recess and a through hole. The recess is located on the side of the first conductive element facing the flat surface and is recessed along a first direction. The through hole penetrates the first conductive element along the first direction. By providing a first through hole in the first conductive element, both sides of the first conductive element can be connected along the first direction. Gas generated during the operation of the electrode assembly can pass through the first through hole, which is beneficial for pressure relief and improves battery safety. By providing a recess in the first conductive element, the recessed area forms a weak area. When the first through hole fails to conduct gas due to an accident, if the gas pressure generated by the electrode assembly reaches a certain level, the recessed area can rupture to relieve pressure, reducing the risk of battery explosion and improving battery safety.

[0013] In some embodiments of this application, the battery further includes a second conductive element disposed within and connected to the housing. The second conductive element is located on the side of the first conductive element away from the current collector. The second conductive element includes a protrusion that protrudes towards the first conductive element in the opposite direction to the first direction and is connected to the first conductive element. The connection of the protrusion of the second conductive element to the first conductive element helps improve the connection stability between various structures within the battery, enhances the battery's shock resistance, and can also form a circuit-breaking structure. When the internal pressure of the battery is too high, the protrusion deforms along the first direction to disconnect from the first conductive element, thereby improving battery safety.

[0014] In some embodiments of this application, there are multiple through holes, which are arranged around the recess at intervals to facilitate gas passage and reduce the risk of some through holes being blocked and losing their pressure relief capability.

[0015] In some embodiments of this application, the battery further includes a first insulating member. Along a first direction, a portion of the first insulating member is located between the electrode assembly and the housing, and connects the electrode assembly and the housing. The first insulating member can serve as insulation and protection, reducing the risk of short circuit between the electrode assembly and the housing. The first insulating member can also serve as a filler, reducing the risk of movement of the electrode assembly relative to the housing, and improving the battery's shock resistance.

[0016] In some embodiments of this application, the battery further includes a second insulating member, at least a portion of which is disposed within the outer casing. The second insulating member connects the first conductive member and the outer casing, and a portion of the second insulating member connects the second conductive member and the outer casing. The second insulating member provides insulation protection, reducing the risk of short circuits within the battery.

[0017] Embodiments of this application also provide an electrical device including the battery described in any of the above embodiments.

[0018] In the aforementioned electrical equipment, the flattened part of the battery, the current collector, and the first conductive element are connected sequentially along the first direction. By controlling the relationship between the distance between the first outer surface and the flattened surface and the thickness of the current collector along the first direction to satisfy F / 5≤(n+1)*b≤F / 3, the electrode assembly, current collector, first conductive element, and outer shell form an interference fit. This helps to improve the stability of the connection between the electrode assembly, current collector, first conductive element, and outer shell, improve the battery's shock resistance, and reduce the impact of battery performance damage due to vibration or drop on the electrical equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the battery structure in one embodiment of this application.

[0020] Figure 2 yes Figure 1A view of section II-II in the structure shown.

[0021] Figure 3 yes Figure 2 A magnified view of region III in the structure shown.

[0022] Figure 4 yes Figure 3 A schematic diagram of an extended embodiment of the structure shown.

[0023] Figure 5 This is a schematic diagram of the structure of the electrode assembly in one embodiment of this application.

[0024] Figure 6 This is a schematic diagram of the structure of the electrode assembly forming the flattened portion in one embodiment of this application.

[0025] Figure 7 This is a schematic diagram of the collector disk structure in one embodiment of this application.

[0026] Figure 8 This is a schematic diagram of the structure of the first conductive element in one embodiment of this application.

[0027] Figure 9 This is a schematic diagram of the structure of an electrical device in one embodiment of this application.

[0028] Explanation of main component symbols

[0029] Battery 100

[0030] Casing 10

[0031] Cover 101

[0032] First outer surface 1011

[0033] Casing 102

[0034] Electrode assembly 20

[0035] Positive electrode 201

[0036] Negative electrode 202

[0037] Diaphragm 203

[0038] Positive extreme 204

[0039] Negative extreme 205

[0040] Kneading part 206

[0041] Kneading flat surface 2061

[0042] 30 Collection Panel

[0043] Main body 301

[0044] Third surface 3011

[0045] Extension 302

[0046] Second surface 3021

[0047] First insulating component 41

[0048] Second insulating component 42

[0049] First conductive component 51

[0050] First surface 511

[0051] Through hole 512

[0052] Recess 513

[0053] Second conductive element 52

[0054] Projection 521

[0055] Third conductive component 53

[0056] 200 electrical appliances

[0057] First direction X

[0058] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0060] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an element positioned in between. When an element is considered to be "set" on another element, it can be directly set on the other element or there may be an element positioned in between. In this application, unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms "comprising" and "equivalent to," and any variations thereof, in the specification, claims, and foregoing description of the drawings, are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0063] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] It should be noted that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative examples and should not constitute any limitation on this application.

[0065] This application provides a battery including a casing, an electrode assembly, a first conductive element, and a current collector. The electrode assembly, the first conductive element, and the current collector are disposed within the casing. The casing has a first outer surface perpendicular to a first direction, and the first conductive element is connected to the casing. The electrode assembly is arranged along the first outer surface in the first direction. The end of the electrode assembly along the first direction has a flattened portion with a flattened surface. The current collector includes a main body and an extension connected to the flattened surface. The main body is connected to the flattened surface, and the extension is folded back between the main body and the first conductive element, connecting the main body and the first conductive element. The extension is folded back to form an n-layer structure, and the n-layer structure is stacked along the first direction, where n is a positive integer ≥ 2. The average thickness of each layer in the main body and the extension is b. Along the first direction, the distance between the first outer surface and the flattened surface is F, where F / 5 ≤ (n+1)*b ≤ F / 3.

[0066] In the battery described above, the flattened part, the current collector, and the first conductive element are connected sequentially along the first direction. By controlling the relationship between the distance between the first outer surface and the flattened surface and the thickness of the current collector along the first direction to satisfy F / 5≤(n+1)*b≤F / 3, the electrode assembly, the current collector, the first conductive element, and the outer shell form an interference fit, which helps to improve the stability of the connection between the electrode assembly, the current collector, the first conductive element, and the outer shell, and improves the shock resistance of the battery.

[0067] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0068] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of this application provides a battery 100, including a housing 10, an electrode assembly 20, a first conductive element 51, and a current collector 30, wherein the electrode assembly 20, the first conductive element 51, and the current collector 30 are disposed within the housing 10. The housing 10 has a first outer surface 1011 perpendicular to a first direction X, and the electrode assembly 20, the current collector 30, the first conductive element 51, and the first outer surface 1011 are arranged along the first direction X.

[0069] The electrode assembly 20 has a flattening portion 206 at its end along the first direction X, and the flattening portion 206 has a flattening surface 2061.

[0070] The collector plate 30 includes a main body 301 and an extension 302 connected to each other. The main body 301 is connected to the flat surface 2061, and the extension 302 is folded back and disposed between the main body 301 and the first conductive member 51, and is connected to the first conductive member 51. The extension 302 is folded back to form an n-layer structure, and the n-layer structure is stacked along the first direction X, where n is a positive integer ≥2. The average thickness of each layer in the main body 301 and the extension 302 is b, respectively.

[0071] Along the first direction X, the thickness of the collector disk 30 is (n+1)*b.

[0072] Along the first direction X, the distance between the first outer surface 1011 and the kneading plane 2061 is F, where F / 5≤(n+1)*b≤F / 3.

[0073] In the battery 100 described above, the flattening portion 206, the current collector 30, and the first conductive element 51 are connected sequentially along the first direction X. By controlling the relationship between the distance between the first outer surface 1011 and the flattening surface 2061 and the thickness of the current collector 30 along the first direction X to satisfy F / 5≤(n+1)*b≤F / 3, the electrode assembly 20, the current collector 30, the first conductive element 51, and the outer shell 10 form an interference fit, which helps to improve the stability of the connection between the electrode assembly 20, the current collector 30, the first conductive element 51, and the outer shell 10, and improves the shock resistance of the battery 100.

[0074] In one embodiment, the value of (n+1)*b / F can be used to characterize the interference fit of the battery 100. If the value of (n+1)*b / F is too small, the connection between the electrode assembly 20, the current collector 30, the first conductive element 51, and the outer casing 10 is relatively loose, the internal structural components of the battery 100 have shifted, the shock resistance of the battery 100 is poor, and it will increase the electronic impedance of the current collector 30, affecting the current carrying capacity of the current collector 30 and the charge and discharge performance of the battery 100. If the value of (n+1)*b / F is too large, the connection between the electrode assembly 20, the current collector 30, the first conductive element 51, and the outer casing 10 is relatively tight, the shock resistance of the battery 100 is good, but the thickness of the current collector 30 along the first direction X is large, resulting in a low internal space utilization rate of the battery 100 and affecting the energy density of the battery 100.

[0075] In one embodiment, 7F / 30≤(n+1)*b≤4F / 15, which is beneficial to further improve the stability of the connection between the electrode assembly 20, the current collector 30, the first conductive element 51 and the outer casing 10, and improve the shock resistance of the battery 100.

[0076] In one embodiment, the value of (n+1)*b / F is any one of 1 / 5, 7 / 30, 4 / 15, 3 / 10, and 1 / 3.

[0077] In one embodiment, the value of n is any one of 2, 3, 4 and 5, which is beneficial to further improve the stability of the connection between the electrode assembly 20, the current collector 30, the first conductive element 51 and the outer casing 10, improve the shock resistance of the battery 100, and also help to reduce the impact of the thickness of the current collector 30 on the internal space of the battery 100, thereby increasing the energy density of the battery 100.

[0078] In one embodiment, the distance between the first outer surface 1011 and the kneading plane 2061 is measured as follows: a partial scan of the head of the battery 100 is performed using CT (Computed Tomography) to form a cross-sectional image, and then the image is measured proportionally using an image ruler. Using the above measurement method, the distances between multiple points (no fewer than 10 points) on the first outer surface 1011 and the kneading plane 2061 are measured, and the average value is taken as the distance F between the first outer surface 1011 and the kneading plane 2061.

[0079] like Figure 1 and Figure 2As shown, in one embodiment, the outer casing 10 includes a cover 101 and a housing 102. The cover 101 and the housing 102 are insulated from each other, forming a closed space. The electrode assembly 20, the current collector 30, and the first conductive element 51 are located within this closed space. The first outer surface 1011 is located on the cover 101 and on the side of the cover 101 facing away from the electrode assembly 20.

[0080] Both the cover 101 and the housing 102 are made of metal. The cover 101 is electrically connected to the first conductive element 51, and the housing 102 is electrically connected to the electrode assembly 20. The cover 101 can serve as the positive terminal of the battery 100, and the housing 102 can serve as the negative terminal of the battery 100. The battery 100 is connected to external devices through the cover 101 and the housing 102 for charging and discharging.

[0081] like Figure 4 As shown, in one embodiment, the battery 100 further includes a first insulating member 41, which is disposed within the housing 10 along the first direction X. A portion of the first insulating member 41 is located between the electrode assembly 20 and the housing 102, and connects the electrode assembly and the housing 102. The first insulating member 41 can provide insulation and protection, reducing the risk of short circuit between the electrode assembly 20 and the housing 102. The first insulating member 41 can also act as a filler, reducing the risk of movement of the electrode assembly 20 relative to the housing 102, and improving the shock resistance of the battery 100.

[0082] In one embodiment, the first insulating member 41 is made of plastic, which is beneficial for insulation protection, reduces the risk of short circuit in the battery 100, and also helps to reduce its own weight, thus reducing its impact on the weight of the battery 100. In one embodiment, the first insulating member 41 is formed by melting and solidifying plastic using injection molding equipment, which simplifies the manufacturing process of the first insulating member 41 and saves manufacturing costs for the battery 100.

[0083] like Figure 3 , Figure 5 and Figure 6 As shown, in one embodiment, the electrode assembly 20 has a wound structure. Along the first direction X, one end of the electrode assembly 20 is the positive terminal 204, and the other end is the negative terminal 205. The collector 30 and the cover 101 are located at the positive terminal 204 of the electrode assembly 20. The collector 30 is connected to the positive terminal 204 of the electrode assembly 20, and the housing 102 is connected to the negative terminal 205 of the electrode assembly 20.

[0084] In one embodiment, the electrode assembly 20 includes a positive electrode 201, a negative electrode 202, and a separator 203. The separator 203 is disposed between the positive electrode 201 and the negative electrode 202. The positive electrode 201, the separator 203, and the negative electrode 202 are wound together to form a cylindrical wound structure. Along the axial direction of the wound structure, the positive electrode 201 on one side of the electrode assembly 20 extends beyond the separator 203, and the negative electrode 202 on the other side of the electrode assembly 20 extends beyond the separator 203.

[0085] The flattening portion 206 is formed by a positive electrode plate 201 extending beyond the diaphragm 203, and the current collector 30 is connected to the positive terminal 204 via the flattening portion 206. In one embodiment, the current collector 30 is welded to the flattening portion 206, for example, by ultrasonic welding or laser welding.

[0086] like Figure 2 As shown, in one embodiment, the battery 100 further includes a third conductive element 53, which is disposed inside the housing 102. The third conductive element 53 connects the negative terminal 205 of the electrode assembly 20 and the housing 102, which helps to improve the connection stability between the negative terminal 205 and the housing 102 and reduce the risk of the negative terminal 205 and the housing 102 disconnecting.

[0087] like Figure 3 and Figure 7 As shown, in one embodiment, 0.1mm≤b≤5mm is beneficial to balance the structural strength and current carrying capacity of the current collector 30, thereby improving its current carrying capacity while ensuring that the current collector 30 has sufficient structural strength.

[0088] In one embodiment, 0.5mm≤b≤2mm is beneficial to further balance the structural strength and current carrying capacity of the current collector 30.

[0089] In one embodiment, along the first direction X, in the n-layer structure, two adjacent layers are in contact with each other, which is beneficial to increase the current-carrying area of ​​the current collector 30, reduce the electronic impedance of the current collector 30, improve the current-carrying capacity of the current collector 30, improve the charging and discharging performance of the battery 100, and also improve the stability of the current collector 30 connecting the electrode assembly 20 and the first conductive element 51, and improve the shock resistance of the battery 100.

[0090] In one embodiment, the first conductive element 51 has a first surface 511, and the first surface 511 and the kneading plane face each other along a first direction X.

[0091] The n-layer structure has a second surface 3021 at its end along the first direction X, and the second surface 3021 is in contact with the first surface 511.

[0092] The main body 301 has a third surface 3011, which is located at the end of the collector plate 30 away from the second surface 3021 and is in contact with the kneading plane 2061.

[0093] Along the first direction X, the projected area of ​​the region where the second surface 3021 connects to the first surface 511 is S1, and the projected area of ​​the region where the third surface 3011 connects to the flat surface 2061 is S2. 0.5≤S1 / S2≤1.5, which is beneficial for the transmission of force on the current collector 30, improves the stability of the current collector 30 connecting the electrode assembly 20 and the first conductive element 51, and also helps to improve the structural strength of the current collector 30, reduce the risk of damage to the current collector 30 due to shaking or impact, and improve the shock resistance of the battery 100.

[0094] In one embodiment, if the ratio of S1 / S2 is too small, the area on the second surface 3021 that transmits force will be too small, which will lead to an unstable connection between the current collector 30 and the first conductive element 51, increasing the risk of shaking between the current collector 30 and the first conductive element 51 and affecting the shock resistance of the battery 100. If the ratio of S1 / S2 is too large, a portion of the structure of the extension 302 will extend beyond the main body 301 in a direction perpendicular to the first direction X, resulting in an unstable structure of the current collector 30 itself, and the current collector 30 will be at risk of deformation or breakage, affecting the shock resistance and safety performance of the battery 100.

[0095] In one embodiment, 0.8≤S1 / S2≤1.2 is beneficial to further improve the stability of the connection between the electrode assembly 20, the current collector 30, the first conductive element 51 and the outer casing 10, and also beneficial to improve the structural strength of the current collector 30, reduce the risk of damage to the current collector 30 due to shaking or impact, and improve the shock resistance of the battery 100.

[0096] In one embodiment, the value of S1 / S2 is any one of 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4 and 1.5.

[0097] like Figure 3 As shown, in one embodiment, the battery 100 further includes a second conductive element 52, which is located between and connects the first conductive element 51 and the cover 101, making the first conductive element 51 electrically connected to the cover 101. Furthermore, the second conductive element 52 is insulated from the housing 102, which helps reduce the risk of a short circuit in the battery 100.

[0098] In one embodiment, the second conductive element 52 includes a protrusion 521 that protrudes toward the first conductive element 51 in the opposite direction to the first conductive element 51, and the protrusion 521 is connected to the first conductive element 51. The connection of the protrusion 521 of the second conductive element 52 to the first conductive element 51 helps improve the connection stability between various structures within the battery 100, enhances the shock resistance of the battery 100, and can also form a circuit-breaking structure. When the pressure inside the battery 100 is too high, the protrusion 521 deforms along the first direction X to disconnect from the first conductive element 51, thereby improving the safety of the battery 100.

[0099] like Figure 3 and Figure 8 As shown, in one embodiment, the first conductive element 51 is provided with a through hole 512, which connects both sides of the first conductive element 51 along the first direction X. By providing the through hole 512 in the first conductive element 51, both sides of the first conductive element 51 along the first direction X can be connected. The gas generated by the operation of the electrode assembly 20 can pass through the through hole 512 to act on the protrusion 521. When the gas pressure reaches a certain level, the protrusion 521 deforms along the first direction X, thereby breaking the circuit and improving the safety of the battery 100.

[0100] In one embodiment, there are multiple through holes 512. In another embodiment, all the through holes 512 are arranged around the center of the first conductive element 51 at intervals.

[0101] In one embodiment, the first conductive element 51 is further provided with a recess 513, which is located on the side of the first conductive element 51 facing the electrode assembly 20. The recess 513 is recessed along the first direction X. The recess 513 can serve as a weak area of ​​the first conductive element 51. If the through hole 512 fails to conduct gas due to an accident, and the gas pressure generated by the electrode assembly 20 reaches a certain level, the area of ​​the recess 513 can be ruptured to release pressure, thereby reducing the risk of battery 100 explosion and improving the safety of battery 100.

[0102] like Figure 8 As shown, in one embodiment, the recess 513 is located at the center of the first conductive element 51, and all the through holes 512 are arranged around the recess 513 at intervals.

[0103] like Figure 3As shown, in one embodiment, the battery 100 further includes a second insulating member 42. At least a portion of the second insulating member 42 is disposed within the housing 10. A portion of the second insulating member 42 connects the first conductive member 51 and the housing 102, creating an insulated connection between the first conductive member 51 and the housing 102. A portion of the second insulating member 42 connects the second conductive member 52 and the housing 102, creating an insulated connection between the second conductive member 52 and the housing 102. By providing the second insulating member 42, the risk of short circuit in the battery 100 is reduced, and it also helps to provide a seal, reducing the risk of external debris entering the battery 100 through the gap between the cover 101 and the housing 102.

[0104] In one embodiment, the second insulating member 42 is made of plastic, which is beneficial for insulation protection, reduces the risk of short circuit in the battery 100, and also helps to reduce its own weight, thus reducing its impact on the weight of the battery 100. In one embodiment, the second insulating member 42 is formed by melting and solidifying plastic using injection molding equipment, which simplifies the manufacturing process of the second insulating member 42 and saves manufacturing costs for the battery 100.

[0105] To verify the performance of the battery 100 of this application, the following tests were conducted:

[0106] The battery 100 is charged to its full charge voltage (4.2V in this embodiment) at a current of 2C (1C represents the current that charges the battery 100 from empty to fully charged in 1 hour), and then charged at a constant voltage to 0.05C, and the charging is completed.

[0107] Drop test:

[0108] In an environment of 25°C, after the fully charged battery 100 was left to stand for 30 minutes, the battery 100 sample was released from a height of 2m in two separate drops. The first drop was when the battery 100 was placed vertically (the first direction X was perpendicular to the test platform), and the second drop was when the battery 100 was placed horizontally (the first direction X was parallel to the test platform).

[0109] If battery 100 catches fire, explodes, or leaks after two drops, it is considered a failure. If battery 100 does not exhibit any of these behaviors, it is considered to have passed the drop test.

[0110] Temperature rise test:

[0111] In an environment of 25°C, after the fully charged battery 100 is left to stand for 30 minutes, the battery 100 is discharged at a constant current of 8C to 2.5V, and then left to stand for 5 minutes. The surface temperature of the battery 100 is measured, and the difference between the measured temperature and 25°C is taken as the temperature rise data of the battery 100.

[0112] Multiple sets of different batteries were tested as described above, and the data were recorded as shown in the table below:

[0113]

[0114]

[0115] As can be seen from the table above, the battery 100 of this application can not only improve the temperature rise of the battery 100, but also significantly improve the shock resistance of the battery 100.

[0116] In summary, in the battery 100 of this application, the flattened portion 206, the current collector 30, and the first conductive element 51 are connected sequentially along the first direction X. By controlling the relationship between the distance between the first outer surface 1011 and the flattened surface 2061 and the thickness of the current collector 30 along the first direction X to satisfy F / 5≤(n+1)*b≤F / 3, the electrode assembly 20, the current collector 30, the first conductive element 51, and the outer shell 10 form an interference fit, which is beneficial to improving the stability of the connection between the electrode assembly 20, the current collector 30, the first conductive element 51, and the outer shell 10, and improving the shock resistance of the battery 100.

[0117] like Figure 9 As shown, an embodiment of this application provides an electrical device 200, including the battery 100 described in any of the foregoing embodiments, wherein the battery 100 is capable of providing electrical energy to the electrical device 200.

[0118] In one embodiment, the electrical equipment 200 includes, but is not limited to, drones, electric vehicles, electric two-wheelers, household appliances, and power tools.

[0119] In the electrical device 200 of this application, the flattened portion 206, the current collector 30, and the first conductive element 51 of the battery 100 are sequentially connected along the first direction X. By controlling the relationship between the distance between the first outer surface 1011 and the flattened surface 2061 and the thickness of the current collector 30 along the first direction X to satisfy F / 5≤(n+1)*b≤F / 3, the electrode assembly 20, the current collector 30, the first conductive element 51, and the outer shell 10 form an interference fit. This is beneficial to improving the stability of the connection between the electrode assembly 20, the current collector 30, the first conductive element 51, and the outer shell 10, improving the shock resistance of the battery 100, and reducing the impact of battery 100 performance damage due to vibration or drop on the electrical device 200.

[0120] In addition, those skilled in the art may make other changes within the spirit of this application. Of course, all such changes made in accordance with the spirit of this application should be included within the scope disclosed in this application.

Claims

1. A battery, characterized in that, include: The outer casing has a first outer surface perpendicular to a first direction; An electrode assembly is disposed inside the housing. The electrode assembly and the first outer surface are arranged along the first direction. The end of the electrode assembly along the first direction is provided with a flattening portion, and the flattening portion has a flattening surface. A first conductive element is disposed inside the housing and connected to the housing; A current collector is disposed within the outer casing. The current collector includes a main body and an extension connected to the kneading plane. Both the main body and the extension are single-layer components. The main body is connected to the kneading plane. The extension is folded back and disposed between the main body and the first conductive element, and connects the main body and the first conductive element. The extension is folded back to form an n-layer structure. The n-layer structure is stacked along the first direction, where n is a positive integer ≥2. The average thickness of each layer in the main body and the extension is b, respectively. Along the first direction, the distance between the first outer surface and the kneading plane is F, F / 5≤(n+1)*b≤F / 3, 0.5mm≤b≤2mm.

2. The battery as described in claim 1, characterized in that, 7F / 30≤(n+1)*b≤4F / 15.

3. The battery as described in claim 1, characterized in that, Along the first direction, in the n-layer structure, adjacent layers are in contact with each other.

4. The battery as described in claim 1, characterized in that, The first conductive element has a first surface, and the first surface and the kneading plane face each other along the first direction; The n-layer structure has a second surface, which is in contact with the first surface; The main body has a third surface, which is in contact with the kneading plane; Along the first direction, the area of ​​the projection of the region where the second surface connects to the first surface is S1, and the area of ​​the projection of the region where the third surface connects to the kneading plane is S2, where 0.5 ≤ S1 / S2 ≤ 1.

5.

5. The battery as described in claim 4, characterized in that, 0.8≤S1 / S2≤1.

2.

6. The battery as claimed in claim 1, characterized in that, The first conductive element further includes a recess and a through hole. The recess is located on the side of the first conductive element facing the kneading plane. The recess is recessed along the first direction. The through hole penetrates the first conductive element along the first direction. The battery further includes a second conductive element, which is disposed inside the housing and connected to the housing. The second conductive element is located on the side of the first conductive element away from the current collector. The second conductive element includes a protrusion that protrudes toward the first conductive element in the opposite direction to the first direction, and the protrusion is connected to the first conductive element.

7. The battery as described in claim 6, characterized in that, The number of through holes is multiple, and the multiple through holes are arranged around the recess at intervals.

8. The battery as described in claim 6, characterized in that, The battery further includes a first insulating member, a portion of which is located between the electrode assembly and the housing along the first direction, and connects the electrode assembly and the housing.

9. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1 to 8.

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