Core rod, battery cell, battery, energy storage device and electric equipment

Abstract

The utility model discloses a core rod, a battery cell, a battery, an energy storage device and electric equipment. The core rod is provided with a channel in the length direction of the core rod, the channel comprises a first end and a second end which are opposite in the length direction of the core rod, and the cross section of the side, close to the first end, of the channel in the direction perpendicular to the length direction of the core rod is non-circular. And / or the cross section of the side, close to the second end, of the channel in the direction perpendicular to the length direction of the core rod is non-circular. According to the core rod with the non-circular cross section at least one end of the channel, the grabbing head of the winding equipment can directly grab the core rod, and the grabbing head of the equipment for winding the core rod is prevented from slipping in the channel, so that the core rod can be directly matched with the equipment for winding the core rod for winding, and the operation of inserting the core rod does not need to be additionally added.

Description

Technical Field

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

[0002] Batteries are widely used as the main power source for electrical equipment due to their recyclability. As the demand for batteries gradually increases, people's requirements for their performance in various aspects are also getting higher and higher, making the stable operation of batteries particularly critical.

[0003] Battery cells can be manufactured by winding the core components onto a core rod using a winding device. However, the gripper of the winding device can slip within the channels of the core rod, preventing the core rod from being directly connected to the winding device. An additional core rod insertion operation is required to connect the winding device and the core rod. Summary of the Invention

[0004] This application provides a core rod, a battery cell, a battery, an energy storage device, and an electrical device.

[0005] In a first aspect, this application provides a mandrel. The mandrel has a channel along its length, the channel including a first end and a second end opposite each other along the length of the mandrel.

[0006] The cross-section of the channel near the first end, perpendicular to the length of the mandrel, is non-circular; and / or,

[0007] The cross-section of the channel on the side near the second end, perpendicular to the length of the mandrel, is non-circular.

[0008] In some embodiments, the channel extends through the first end and the second end along the length direction of the mandrel. The mandrel includes a first channel and a second channel located at opposite ends along the length direction of the mandrel, and a third channel located between the first channel and the second channel. The first channel is closer to the first end, and the second channel is closer to the second end. The first channel, the third channel, and the second channel are sequentially connected. The first channel and / or the second channel have a non-circular cross-section perpendicular to the length direction of the mandrel, and the third channel has a circular cross-section perpendicular to the length direction of the mandrel.

[0009] In some embodiments, the non-circular shape includes at least one of a square, rectangle, triangle, ellipse, rhombus, trapezoid, parallelogram, pentagon, hexagon, and irregular polygon.

[0010] In some embodiments, in the longitudinal direction of the mandrel, the length B1 of the first channel, the length B2 of the second channel, and the length L of the mandrel satisfy the relationship: B1 + B2 < L / 2, where B1, B2, and L are in the same unit.

[0011] In some embodiments, 5. The mandrel according to claim 4, wherein in the longitudinal direction of the mandrel, the length B1 of the first channel is the same as or different from the length B2 of the second channel.

[0012] In some embodiments, the dimension D1 of the cross-section of the first channel in the radial direction of the mandrel, the dimension D2 of the cross-section of the second channel in the radial direction of the mandrel, and the dimension D3 of the cross-section of the third channel in the radial direction of the mandrel satisfy the relationship: D1 > D3; and / or, D2 > D3; and / or, D1 = D2.

[0013] In some embodiments, the mandrel is provided with at least one through hole penetrating the peripheral wall of the mandrel, and the through hole is communicated with the first channel; and / or, the through hole is communicated with the second channel; and / or, the through hole is communicated with the third channel.

[0014] In a second aspect, the present application provides an electrode core. The electrode core includes the mandrel and the electrode core assembly according to any one of the above embodiments. The electrode core assembly is wound around the peripheral wall of the mandrel.

[0015] In a third aspect, the present application provides a battery. The battery includes the electrode core and the housing according to any one of the above embodiments. The electrode core is accommodated in the housing.

[0016] In a fourth aspect, the present application provides an energy storage device. The energy storage device includes the battery according to any one of the above embodiments.

[0017] In a fifth aspect, the present application provides an electrical equipment. The electrical equipment includes the battery according to any one of the above embodiments, or includes the energy storage device according to any one of the above embodiments.

[0018] In the mandrel, the electrode core, the battery, the energy storage device, and the electrical equipment provided by the present application, the mandrel with a non-circular cross-section at at least one end of the channel can enable the gripper of the winding device to directly grip the mandrel, preventing the gripper of the device for winding the mandrel from slipping in the channel, so that the mandrel can directly cooperate with the device for winding the mandrel for winding, and there is no need to additionally perform the operation of inserting the mandrel.

[0019] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. Description of the Drawings

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the core rod according to certain embodiments of this application;

[0022] Figure 2 yes Figure 1 A schematic cross-sectional view of the mandrel shown;

[0023] Figure 3 This is a three-dimensional structural schematic diagram of a core rod according to another embodiment of this application;

[0024] Figure 4 This is a three-dimensional structural schematic diagram of a battery cell according to certain embodiments of this application;

[0025] Figure 5 yes Figure 4 The diagram shows a cross-sectional view of the battery cell.

[0026] Figure 6 This is a three-dimensional assembly diagram of a battery according to certain embodiments of this application;

[0027] Figure 7 This is an exploded perspective view of a battery according to certain embodiments of this application;

[0028] Figure 8 This is a schematic diagram of an energy storage device according to certain embodiments of this application;

[0029] Figure 9 This is a schematic diagram of an electrical device according to certain embodiments of this application.

[0030] Explanation of key component designations:

[0031] Electrical equipment 10000; energy storage device 1000; battery 100; enclosure 300; enclosure cover 301; enclosure body 303;

[0032] Battery cell 10, core rod 11, channel 113, first channel 1131, second channel 1133, third channel 1135, first end 115, second end 117, middle section 118, peripheral wall 119, through hole 1191, electrode core assembly 13; housing 30, first cover plate 31, second cover plate 33, shell body 35. Detailed Implementation

[0033] In the description of this application, some of the disclosed content has been illustrated 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 following description with reference to the accompanying drawings is exemplary and is only used to explain this application, and should not be construed as limiting this application.

[0034] This application discloses many different contents or examples for implementing different structures. To simplify the disclosure of this application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0035] 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 the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In the description of this application, it should be understood that the terms used to indicate orientation or positional relationship (such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc.) are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and understanding the corresponding embodiments, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to indicate orientation or positional relationship should not be construed as limitations on this application.

[0037] In the description of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0039] Please see Figure 1 This application provides a mandrel 11. The mandrel 11 has a channel 113 extending through both ends of the mandrel 11 along the length direction (Z direction), and at least one end of the channel 113 has a non-circular cross-section perpendicular to the length direction of the mandrel.

[0040] Specifically, please combine Figure 4 The core rod 11 is a structure used for winding the electrode core assembly 13. When manufacturing the battery cell 10 by winding, the core rod 11 is first inserted into the gripper of the winding equipment and fixed to the equipment. Then, the electrode core assembly 13 is fixed to the surface of the core rod 11. Finally, the rotation of the winding equipment drives the core rod 11 to rotate, and the rotation of the core rod 11 causes the electrode core assembly 13 to be wound onto the core rod 11, thereby forming the battery cell 10. The equipment for winding the core rod 11 includes, but is not limited to, cylindrical battery winding machines, prismatic battery winding machines, or pouch battery winding machines, hereinafter referred to as winding equipment.

[0041] The outer contour of the mandrel 11 can be cylindrical, cuboid, or polygonal, and is not limited to any particular shape in this application. This embodiment uses a cylindrical outer contour of the mandrel 11 as an example. A cylindrical outer contour ensures uniform contact pressure between the electrode assembly 13 and the outer contour of the mandrel 11, preventing excessive local pressure from the mandrel 11 that could cause deformation of the electrode assembly 13. The material of the mandrel 11 can be metallic or non-metallic. For example, the mandrel 11 can be made of aluminum, which provides both good hardness to support the electrode assembly 13 and relatively light weight.

[0042] Please refer to the following: Figure 1 and Figure 2The core rod 11 includes a first end 115 and a second end 117 located at opposite ends along its length, and an intermediate section 118 between the first end 115 and the second end 117, and is provided with a channel 113 passing through the first end 115 and the second end 117. The cross-section of the channel 113 is the cross-section obtained by the channel 113 being cut by a plane perpendicular to the length direction Z of the core rod 11 (i.e., the cross-section perpendicular to the length direction Z of the core rod 11), which is the cross-section of the cavity inside the channel 113 perpendicular to the length direction Z of the core rod 11, excluding the outer contour of the core rod 11. In this configuration, the cross-section of at least one end of channel 113 is non-circular. This can be achieved by the channel 113 at the first end 115 having a non-circular cross-section, while the channel 113 at the second end 117 and the middle section 118 has a circular cross-section; alternatively, the channel 113 at the second end 117 may have a non-circular cross-section, while the channel 113 at the first end 115 and the middle section 118 has a circular cross-section; or both the cross-sections of the channel 113 at the first end 115 and the channel 113 at the second end 117 may be non-circular, while the channel 113 at the middle section 118 has a circular cross-section. The portion of channel 113 with a circular cross-section exhibits strong bending resistance. The portion of channel 113 with a non-circular cross-section can be matched to the shape of the gripper head of the winding equipment to secure the mandrel 11.

[0043] In the above embodiments, the mandrel 11 with a non-circular cross-section at at least one end of the channel 113 of this application can directly cooperate with the winding equipment for winding, without the need for additional mandrel insertion. After the winding operation is completed, the mandrel 11 of this application does not need to be removed from the core assembly 13, providing support for the core assembly 13 and preventing the core assembly 13 from becoming hollow and collapsing during use due to the removal of the mandrel. The non-circular cross-section at at least one end of the channel 113 also facilitates the gripper of the winding equipment in grasping the mandrel 11, preventing the gripper from slipping within the channel 113. Compared to the cross-section of the mandrel's channel being non-circular everywhere, the cross-section of the channel 113 of this application is non-circular at at least one end, while the cross-section of the remaining parts is circular. This facilitates the gripper of the winding equipment in grasping the mandrel 11 while also giving the mandrel 11 good bending resistance and making it less prone to deformation under stress.

[0044] Please see Figure 2 and Figure 4In some embodiments, the channel 113 of the core rod 11 includes a first channel 1131 and a second channel 1133 located at opposite ends of the channel 113, and a third channel 1135 located between the first channel 1131 and the second channel 1133. The first channel 1131, the third channel 1135 and the second channel 1133 are connected in sequence. The cross-section of the first channel 1131 and / or the second channel 1133 is non-circular, and the cross-section of the third channel 1135 is either non-circular or circular.

[0045] Specifically, the channel located at the first end 115 of the mandrel 11 is the first channel 1131, the channel located at the second end 117 of the mandrel 11 is the second channel 1133, and the channel located at the middle section 118 of the mandrel 11 is the third channel 1135. The first channel 1131, the third channel 1135, and the second channel 1133 are connected sequentially to form channel 113. The flow areas of the first channel 1131, the third channel 1135, and the second channel 1133 can be the same, different, or partially the same. In the first channel 1131, the third channel 1135, and the second channel 1133, the cross-section of the first channel 1131 can be non-circular, while the cross-sections of the third channel 1135 and the second channel 1133 can be circular; alternatively, the cross-section of the second channel 1133 can be non-circular, while the cross-sections of the third channel 1135 and the first channel 1131 can be circular; alternatively, the cross-sections of the first channel 1131 and the third channel 1135 can be non-circular, while the cross-section of the second channel 1133 can be circular; alternatively, the cross-sections of the second channel 1133 and the third channel 1135 can be non-circular, while the cross-section of the first channel 1131 can be circular; alternatively, the cross-sections of the first channel 1131 and the second channel 1133 can be non-circular, while the cross-section of the third channel 1135 can be circular; alternatively, the cross-sections of the first channel 1131, the third channel 1135, and the second channel 1133 can all be non-circular. This application only shows the core rod 11 when the cross-section of the first channel 1131 and the cross-section of the second channel 1133 are non-circular and the cross-section of the third channel 1135 is circular.

[0046] The non-circular cross-section of the first channel 1131 and / or the second channel 1133 allows the mandrel 11 to directly engage with the winding equipment for winding, eliminating the need for additional mandrel insertion. After winding, the mandrel 11 does not need to be removed from the core assembly 13, providing support and preventing the core assembly 13 from becoming hollow and collapsing during use due to mandrel removal. The non-circular cross-section of the first channel 1131 and / or the second channel 1133 also facilitates the gripper of the winding equipment in grasping the mandrel 11, preventing slippage within the first channel 1131 and / or the second channel 1133. Compared to the non-circular cross-section of the channels in the mandrel, the cross-section of the first channel 1131 and / or the second channel 1133 in this application is non-circular, while the cross-section of the remaining parts, such as the cross-section of the third channel 1135, is circular. This allows the mandrel 11 to be easily gripped by the gripper of the winding equipment, while also giving the mandrel 11 good resistance to bending and making it less prone to deformation under stress.

[0047] Please see Figure 2 In some embodiments, non-circular shapes include at least one of square, rectangle, triangle, ellipse, rhombus, trapezoid, parallelogram, pentagon, and hexagon.

[0048] Specifically, this applies when one or more of the cross-sections of the first channel 1131, the third channel 1135, and the second channel 1133 are non-circular. A circle is defined as the set of all points equidistant from a fixed point (the center). Therefore, a non-circular shape is any shape that does not conform to this definition. For example, the cross-section can be a regular polygon, a semi-circle, etc., and a regular polygon can be an equilateral triangle, a regular quadrilateral, a regular pentagon, a regular hexagon, a regular heptagon, a regular octagon, or a regular polygon with more than one or more sides. A regular polygonal cross-section is easy to process and demold, and also facilitates the insertion and alignment of the mandrel 11 into the winding equipment. Preferably, in the embodiments of this application, the cross-sections of the first channel 1131 and the second channel 1133 are regular hexagons. A regular hexagon ensures appropriate stress strength on each side and allows for a smaller rotation angle when the mandrel 11 is inserted into and aligned with the winding equipment, making insertion easier and more efficient.

[0049] Please see Figure 2 In some implementations, the length B1 of the first channel 1131 is the same as the length B2 of the second channel 1133.

[0050] The length B1 of the first channel 1131 is the same as the length B2 of the second channel 1133, and the cross-sections of the first channel 1131 and the second channel 1133 are both non-circular. For example, when they are regular hexagons, a redundant design can be provided for the mandrel 11, enabling the winding device to connect the mandrel 11 by simply grasping either end of the mandrel 11 without the need for identification.

[0051] Please refer to Figure 2 , in some embodiments, the length B1 of the first channel 1131 is different from the length B2 of the second channel 1133.

[0052] Specifically, the difference between the length B1 of the first channel 1131 and the length B2 of the second channel 1133 allows the mandrel 11 to meet the requirements of different winding devices, making the mandrel 11 applicable to more winding devices.

[0053] Please refer to Figure 1 and Figure 2 , in some embodiments, the length B1 of the first channel 1131, the length B2 of the second channel 1133, and the length L of the mandrel 11 satisfy the relationship: B1 + B2 < L / 2. Here, B1, B2, and L are in the same unit.

[0054] Specifically, the relationship between the length B1 of the first channel 1131, the length B2 of the second channel 1133, and the length L of the mandrel 11 can be B1 + B2 = 3L / 8; B1 + B2 = 2L / 5; B1 + B2 = L / 9; B1 + B2 = L / 8; B1 + B2 = L / 7; B1 + B2 = L / 6; B1 + B2 = L / 5; B1 + B2 = L / 4; or B1 + B2 = L / 3. If B1 + B2 ≥ L / 2, the sum of the length B1 of the first channel 1131 and the length B2 of the second channel 1133 is too long, resulting in an insufficient length of the channel 113 with a circular cross-section, that is, the length of the second channel 1133 is insufficient, and further leading to insufficient strength of the mandrel 11, making it prone to deformation under force. While B1 + B2 < L / 2 can not only enable the first channel 1131 and / or the second channel 1133 to directly cooperate with the winding device for winding without the need for an additional operation of inserting the mandrel, but also ensure the length of the channel 113 with a circular cross-section (the length of the second channel 1133), thereby ensuring the strength of the mandrel 11, and the mandrel 11 is not easily deformed under force.

[0055] Please refer to Figure 2 and Figure 3 , in some embodiments, the dimension D1 of the cross-section of the first channel 1131 in the radial direction of the mandrel 11, the dimension D2 of the cross-section of the second channel 1133 in the radial direction of the mandrel 11, and the dimension D3 of the cross-section of the third channel 1135 in the radial direction of the mandrel 11 satisfy the relationship: D1 = D2 > D3.

[0056] Specifically, the radial direction is perpendicular to the length direction Z and passes through the centerline of the mandrel 11 in the length direction Z. The dimensions D1 of the cross-section of the first channel 1131 in the radial direction of the mandrel 11, the dimensions D2 of the cross-section of the second channel 1133 in the radial direction of the mandrel 11, and the dimensions D3 of the cross-section of the third channel 1135 in the radial direction of the mandrel 11 can satisfy the following relationships: D1 = D2 = 1.1D3, D1 = D2 = 1.3D3, D1 = D2 = 1.5D3, D1 = D2 = 1.7D3, D1 = D2 = 1.8D3, D1 = D2 = 2.1D3, D1 = D2 = 2.2D3, D1 = D2 = 2.5D3, D1 = D2 = 2.6D3. If the cross-sectional dimensions D1 of the first channel 1131 and D2 of the second channel 1133 in the radial direction of the mandrel 11 are less than or equal to the cross-sectional dimension D3 of the third channel 1135 in the radial direction of the mandrel 11 (i.e., D1 = D2 ≤ D3), then the cross-sectional dimension D3 of the third channel 1135 in the radial direction of the mandrel 11 is too large, the thickness of the mandrel 11 at the third channel 1135 is too small, and the support of the mandrel 11 is insufficient, making the mandrel 11 prone to deformation. If the cross-sectional dimensions D1 of the first channel 1131 and D2 of the second channel 1133 in the radial direction of the mandrel 11 are greater than the cross-sectional dimension D3 of the third channel 1135 in the radial direction of the mandrel 11, then the dimensions of the first channel 1131 and / or the second channel 1133 are appropriate, facilitating the connection of the mandrel 11 to the winding equipment, and the mandrel 11 has strong bending resistance.

[0057] Please see Figure 2 , Figure 3 and Figure 5 In some embodiments, the peripheral wall 119 of the core rod 11 is provided with a through hole 1191, which is connected to the first channel 1131; and / or, the through hole 1191 is connected to the second channel 1133; and / or, the through hole 1191 is connected to the third channel 1135.

[0058] Specifically, the peripheral wall 119 of the core rod 11 has a through hole 1191 for the flow of electrolyte. The through hole 1191 can communicate with one or more of the first channel 1131, the third channel 1135, and the second channel 1133. More specifically, the through hole 1191 can communicate with the first channel 1131, the second channel 1133, or the third channel 1135; it can communicate with two of the three channels; or it can communicate with all three channels. The cross-section of the through hole 1191 can be circular, elliptical, quadrilateral, or hexagonal, etc., and is not limited in this application. There can be one or more through holes 1191. When there are multiple through holes 1191, the cross-sectional areas of the multiple through holes 1191 can be the same, partially the same, or all different. When there are multiple through holes 1191, the spacing between adjacent through holes 1191 can be the same, partially the same, or all different.

[0059] The through-holes 1191 enhance the wettability of the electrolyte to the core assembly 13, allowing the electrolyte to penetrate around the peripheral wall 119 of the core rod 11 and thus form good contact with the core assembly 13. Furthermore, the multiple through-holes 1191 can improve the uneven distribution of the electrolyte among the core assemblies 13, allowing the electrolyte to contact the core assemblies 13 more evenly and fully. In addition, the more uniform electrolyte distribution also helps to conduct and disperse heat among the core assemblies 13.

[0060] Please see Figure 4 and Figure 5 This application provides a battery cell 10. The battery cell 10 includes a core rod 11 and an electrode assembly 13 as described in any of the above embodiments. The electrode assembly 13 is wound around the core rod 11.

[0061] Specifically, please combine Figure 6The battery cell 10 is the core structure of the battery 100 that converts electrical energy into chemical energy through a chemical reaction for charging and discharging. The battery cell 10 is generally made by winding an electrode core assembly 13 onto a core rod 11. The electrode core assembly 13 mainly includes a negative electrode core, a positive electrode core, and a separator. In one possible design, the negative electrode core, separator, and positive electrode core are sequentially stacked and attached to the core rod 11 by adhesive or hot-melt methods before being wound. After formation, the battery cell 10 has gaps through which electrolyte can enter. The electrolyte is used to wet the battery cell 10, ensuring that ions can move freely during charging and discharging. The electrolyte includes, but is not limited to, lithium salts, organic solvents, and additives. The negative electrode core includes a negative current collector (e.g., copper foil) and a layer of negative active material (e.g., carbon or silicon) coated on the surface of the negative current collector. The positive electrode core includes a positive current collector (e.g., aluminum foil) and a layer of positive active material (e.g., ternary material, lithium iron phosphate, or lithium cobalt oxide) coated on the surface of the positive current collector. A separator is located between adjacent negative and positive electrode cores to separate them.

[0062] The cross-section of at least one end of the channel 113 of the mandrel 11 is non-circular, which allows the gripper of the winding equipment to directly grip the mandrel 11 and prevents the gripper of the winding equipment from slipping in the channel 113. This allows the mandrel 11 to directly cooperate with the winding equipment for winding without the need for additional mandrel insertion.

[0063] Please see Figure 6 and Figure 7 This application provides a battery 100. The battery 100 includes a battery cell 10 and a housing 30 according to any of the above embodiments. The battery cell 10 is housed in the housing 30.

[0064] Specifically, the housing 30 is a component in the battery 100 used to house the battery cell 10. In the battery 100, the housing 30 has a cylindrical structure, and in different embodiments, the height and radius of the housing 30 can be selected according to actual needs. The housing 30 mainly includes a first cover plate 31, a second cover plate 33, and a housing body 35. Either the first cover plate 31 or the second cover plate 33 can be integrally formed with the housing body 35. In other embodiments, the housing body 35, the first cover plate 31, and the second cover plate 33 can be separately formed. When formed separately, the first cover plate 31 and the housing body 35, and the second cover plate 33 and the housing body 35, can be joined together by detachable connections, including but not limited to snap-fit ​​connections or threaded connections. In another example, the first cover plate 31 and the housing body 35, and the second cover plate 33 and the housing body 35, can be joined together by non-detachable connections, including but not limited to bonding or welding.

[0065] Both the first cover plate 31 and the second cover plate 33 are used to seal the housing 35, so that the housing 30 forms a closed cavity to accommodate the electrolyte and the battery cell 10. The first cover plate 31 and the second cover plate 33 are respectively connected to the positive and negative tabs of the battery cell 10. When the first cover plate 31 is connected to the positive tab of the battery cell 10, the second cover plate 33 is connected to the negative tab of the battery cell 10; when the first cover plate 31 is connected to the negative tab of the battery cell 10, the second cover plate 33 is connected to the positive tab of the battery cell 10. In this application, the first cover plate 31 is connected to the positive tab of the battery cell 10, and the second cover plate 33 is connected to the negative tab of the battery cell 10.

[0066] In the above implementation, the cross-section of the mandrel 11 at at least one end of the channel 113 is non-circular, which allows the gripper of the winding equipment to directly grip the mandrel 11, preventing the gripper of the winding equipment from slipping in the channel 113. This allows the mandrel 11 to directly cooperate with the winding equipment for winding without the need for additional mandrel insertion.

[0067] Please see Figure 1 and Figure 8 This application provides an energy storage device 1000. The energy storage device 1000 includes a battery 100 according to any of the above embodiments.

[0068] Specifically, the energy storage device 1000 of this application can be charged and store electrical energy, and can also discharge to power other external devices. The energy storage device 1000 includes a battery 100 and a housing 300. The energy storage device 1000 includes multiple batteries 100. The housing 300 is used to provide housing space for the batteries 100, and the housing 300 can adopt various structures. In some embodiments, the housing 300 may include a cover 301 and a body 303, the cover 301 and the body 303 covering each other, and the cover 301 and the body 303 together define a housing space for accommodating the batteries 100. The box body 303 can be a hollow structure with one open end, and the box lid 301 can be a plate-like structure. The box lid 301 closes onto the open side of the box body 303 so that the box lid 301 and the box body 303 together define the storage space. Alternatively, both the box lid 301 and the box body 303 can be hollow structures with one open side, with the open side of the box lid 301 closing onto the open side of the box body 303. The box body 300 formed by the box lid 301 and the box body 303 can be of various shapes, such as a cylinder or a cuboid.

[0069] The cross-section of at least one end of the channel 113 of the core rod 11 in the battery 100 of the energy storage device 100 is non-circular, which allows the gripper of the winding device to directly grip the core rod 11, preventing the gripper of the winding device from slipping in the channel 113. This allows the core rod 11 to directly cooperate with the winding device for winding without the need for additional core rod insertion.

[0070] Please see Figure 1 and Figure 9 This application provides an electrical device 10000. The electrical device 10000 includes a battery 100 according to any embodiment, or an energy storage device 1000 according to any embodiment.

[0071] Specifically, the battery 100 or energy storage device 1000 disclosed in this application can be used in electrical equipment 10000 that uses the energy storage device 10000 as a power source. The electrical equipment 10000 can be, but is not limited to, electric vehicles, power tools, mobile phones, ships, or spacecraft, etc. Spacecraft can include drones, rockets, space shuttles, etc. This application only uses a vehicle as an example for illustration. The vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The energy storage device 1000 is installed inside the vehicle and can be located at the bottom, front, or rear of the vehicle. The energy storage device 1000 can be used to power the vehicle; for example, the energy storage device 1000 can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery pack 100 to power the motor, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some implementations, the energy storage device 1000 can serve not only as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0072] The cross-section of at least one end of the channel 113 of the core rod 11 in the battery 100 of the energy storage device 100 is non-circular, which allows the gripper of the winding device to directly grip the core rod 11, preventing the gripper of the winding device from slipping in the channel 113. This allows the core rod 11 to directly cooperate with the winding device for winding without the need for additional core rod insertion.

[0073] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to the embodiments of this application without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A mandrel (11), characterized in that, The mandrel (11) is provided with a channel (113) along the length direction of the mandrel (11). The channel (113) includes a first end and a second end that are opposite to each other along the length direction of the mandrel (11). One side of the channel (113) close to the first end has a non-circular cross-section in a direction perpendicular to the length direction of the mandrel (11); and / or, One side of the channel (113) close to the second end has a non-circular cross-section in a direction perpendicular to the length direction of the mandrel (11).

2. The mandrel (11) according to claim 1, wherein the channel (113) penetrates through the first end and the second end along the length direction of the mandrel (11). The mandrel (11) includes a first channel (1131) and a second channel (1133) located at opposite ends in the length direction of the mandrel (11), and a third channel (1135) located between the first channel (1131) and the second channel (1133). The first channel (1131) is close to the first end, the second channel (1133) is close to the second end, and the first channel (1131), the third channel (1135), and the second channel (1133) are connected in sequence; the cross-section of the first channel (1131) and / or the second channel (1133) in a direction perpendicular to the length direction of the mandrel (11) is non-circular, and the cross-section of the third channel (1135) in a direction perpendicular to the length direction of the mandrel (11) is circular.

3. The mandrel (11) according to claim 1, characterized in that, The non-circular shape includes at least one of a square, a rectangle, a triangle, an ellipse, a rhombus, a trapezoid, a parallelogram, a pentagon, a hexagon, and an irregular polygon.

4. The mandrel (11) according to claim 2, characterized in that, In the length direction of the mandrel (11), the length B1 of the first channel (1131), the length B2 of the second channel (1133), and the length L of the mandrel (11) satisfy the relationship: B1 + B2 < L / 2, where B1, B2, and L are in the same unit.

5. The mandrel (11) according to claim 4, characterized in that, In the length direction of the mandrel (11), the length B1 of the first channel (1131) is the same as or different from the length B2 of the second channel (1133).

6. The mandrel (11) according to claim 2, characterized in that, The dimension D1 of the cross-section of the first channel (1131) in the radial direction of the mandrel (11), the dimension D2 of the cross-section of the second channel (1133) in the radial direction of the mandrel (11), and the dimension D3 of the cross-section of the third channel (1135) in the radial direction of the mandrel (11) satisfy the relationship:[[]] D1 > D3; and / or, D2 > D3; and / or, D1 = D2.

7. The mandrel (11) according to claim 2, characterized in that, The mandrel (11) is provided with at least one through hole (1191) that penetrates the peripheral wall (119) of the mandrel (11). The through hole (1191) is connected to the first channel (1131); and / or, The through hole (1191) is connected to the second channel (1133); and / or, The through hole (1191) is connected to the third channel (1135).

8. A battery cell (10), characterized in that, Comprising:[[]] The mandrel (11) according to claims 1 - 7; and The core assembly (13) is wound around the peripheral wall of the core rod (11).

9. A battery (100), characterized in that, include: The battery cell (10) as described in claim 8; and The housing (30) contains the battery cell (10).

10. An energy storage device (1000), characterized in that, Includes the battery (100) as described in claim 9.

11. An electrical appliance (10000), characterized in that, include: The battery (100) according to claim 9; or Includes the energy storage device (1000) as described in claim 10.

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