Battery top cover, battery monomer, battery pack and vehicle

Abstract

The application provides a battery top cover, a battery monomer, a battery pack and a vehicle. The battery top cover comprises a cover plate, an electrode lead-out hole arranged along a first direction is arranged on the cover plate, a fixing ring comprising a bent part, at least part of the bent part is arranged in the electrode lead-out hole, a pole is arranged in the electrode lead-out hole, and at least part of the outer circumferential surface of the pole is in contact with the bent part. In the application, the traditional welding mode is abandoned, and the connection cost of the pole and the fixing ring is reduced. Meanwhile, at least part of the outer circumferential surface of the pole is in contact with the bent part, the contact area and the friction between the pole and the fixing ring are increased, the connection stability and reliability between the pole and the fixing ring are improved, the contact resistance in the current conduction process is reduced, and the charging and discharging performance and efficiency of the battery monomer are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery top cover, a battery cell, a battery pack, and a vehicle. Background Technology

[0002] The battery cover has electrode lead-out holes, and the terminals are located inside the electrode lead-out holes to achieve electrical connection between the battery cell and the external circuit. The battery cover also has a retaining ring, and the terminals are fixedly connected to the retaining ring to ensure the stability of the terminals, thereby ensuring stable current conduction during the charging and discharging of the battery cell.

[0003] In traditional methods, the terminals and retaining rings are connected by welding. However, due to the different materials of the positive and negative terminals, the reliability of the welding is poor. Therefore, some current methods use composite materials for one terminal; however, this significantly increases the connection cost between the terminal and retaining ring. Other methods use riveting to connect the terminal and retaining ring. However, this method results in high contact resistance between the terminal and retaining ring, leading to a rapid temperature rise in the terminal during battery cell charging and discharging, which affects the battery cell's charging and discharging performance. Utility Model Content

[0004] In view of this, this application provides a battery top cover, a battery cell, a battery pack, and a vehicle to at least solve the problems of high connection cost between the terminal post and the retaining ring, or large contact resistance between the terminal post and the retaining ring in the prior art.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: In a first aspect, this application provides a battery top cover, comprising: A cover plate, wherein the cover plate is provided with electrode lead-out holes arranged along a first direction; A retaining ring includes a bent portion, at least a portion of which passes through the electrode lead-out hole; A pole post is inserted through the electrode lead-out hole, and at least a portion of the outer peripheral surface of the pole post is in contact with the bent portion.

[0006] Optionally, the bent portion is arranged around the first direction to form a cylindrical structure.

[0007] Optionally, the dimension of the bent portion along the first direction is 2mm-5mm.

[0008] Optionally, the outer peripheral surface of the pole post is provided with a first protrusion, and the first protrusion is in interference fit with the bending portion; or, the surface of the bending portion near the pole post is provided with a first protrusion, and the first protrusion is in interference fit with the pole post.

[0009] Optionally, the first protrusion extends along the first direction to form an edge.

[0010] Optionally, the dimension of the edge along the first direction does not exceed 0.5 mm.

[0011] Optionally, the electrode post includes a cylindrical portion and a disc portion, the disc portion being connected to one end of the cylindrical portion along the first direction; the radial dimension of the disc portion is larger than the radial dimension of the cylindrical portion along the radial direction of the electrode lead-out hole; a second protrusion is provided on the surface of the disc portion near the cylindrical portion, the second protrusion being in an interference fit with the bent portion; or, a second protrusion is provided at one end of the bent portion along the first direction, the second protrusion being in an interference fit with the disc portion.

[0012] Optionally, the second protrusion is arranged to form a protruding ring around the first direction; or, there are multiple second protrusions, which are spaced apart around the first direction.

[0013] Optionally, the battery top cover further includes: a sealing ring disposed between the disc body portion and the cover plate; a portion of the sealing ring extends radially along the electrode lead-out hole and abuts against the disc body portion, and another portion of the sealing ring extends along the first direction and abuts against the bent portion.

[0014] Optionally, the electrode post includes a positive electrode post and a negative electrode post, wherein the negative electrode post is made of pure copper.

[0015] Secondly, this application provides a battery cell, including a housing, an electrode core, and a battery top cover as described in any of the preceding claims. The housing has a receiving cavity, the electrode core is disposed in the receiving cavity, and the battery top cover is fixedly connected to the housing to seal the receiving cavity.

[0016] Thirdly, this application provides a battery pack, including the battery top cover described in any of the foregoing claims, or including the aforementioned battery cells.

[0017] Fourthly, this application provides a vehicle including the aforementioned battery pack.

[0018] Compared with the prior art, the battery top cover, battery cell, battery pack, and vehicle described in this application have the following advantages: The battery top cover in this application abandons the traditional welding method, which helps reduce the connection cost between the terminal post and the fixing ring. Meanwhile, the fixing ring includes a bent portion located on the side of the fixing ring near its center. At least a portion of the bent portion passes through the electrode lead-out hole, and at least a portion of the outer peripheral surface of the terminal post contacts the bent portion. This arrangement increases the contact area and friction between the terminal post and the fixing ring, thereby improving the connection stability and reliability between the terminal post and the fixing ring. Furthermore, the contact between the outer peripheral surface of the terminal post and the bent portion forms a good conductive path, which helps reduce contact resistance during current conduction, thereby reducing energy loss, improving overcurrent capacity, and ultimately improving the charge-discharge performance and efficiency of the battery cell. Additionally, the fact that at least a portion of the bent portion passes through the electrode lead-out hole, and the side of the bent portion away from the outer peripheral surface of the terminal post contacts the cover plate, helps the cover plate better withstand the radial pressure generated by the terminal post, reducing the risk of cover plate deformation or damage.

[0019] The battery cell, battery pack, and vehicle described in this application have the same or similar advantages as the prior art and the aforementioned battery cover, which will not be elaborated here. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 A cross-sectional schematic diagram of a battery top cover according to an embodiment of this application is shown; Figure 2 It shows Figure 1 A magnified view of a portion of the bend.

[0021] Explanation of reference numerals in the attached figures: 1-Cover plate, 2-Fixing ring, 21-Bending part, 3-Pole post, 31-Column part, 32-Disc part, 41-First protrusion, 42-Second protrusion, 5-Sealing ring, 51-First sealing part, 52-Second sealing part, 61-Upper plastic, 62-Lower plastic, Z-First direction. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] It should be understood that the phrase "some embodiments" throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0025] The following detailed description of a battery top cover, battery cell, battery pack, and vehicle provided in this application is illustrated by specific embodiments.

[0026] Example 1 In a first aspect, embodiments of this application provide a battery top cover, referring to... Figure 1 and Figure 2 , Figure 1 A cross-sectional schematic diagram of a battery top cover according to an embodiment of this application is shown. Figure 2 It shows Figure 1 A magnified view of a portion of the bend.

[0027] The battery top cover includes a cover plate 1, a fixing ring 2, and a terminal post 3; the cover plate 1 is provided with an electrode lead-out hole arranged along the first direction Z; the fixing ring 2 includes a bent portion 21, at least a portion of which passes through the electrode lead-out hole; the terminal post 3 passes through the electrode lead-out hole, and at least a portion of the outer peripheral surface of the terminal post 3 contacts the bent portion 21.

[0028] Specifically, the cover plate 1 is mostly a flat plate structure, and its specific shape and structure match the specifications of the battery cell. For example, the cover plate 1 of a square battery cell is a rectangular plate, and the cover plate 1 of a cylindrical battery cell is a circular plate. The cover plate 1 is mostly made of metal sheet, such as aluminum alloy plate or stainless steel plate, which has good strength and can provide good mechanical support for components such as the terminal post 3 and the fixing ring 2.

[0029] The electrode lead-out hole is a through hole on the cover plate 1, extending through the cover plate 1 along a first direction Z, wherein the first direction Z is in the same direction as the thickness direction of the cover plate 1. The diameter of the electrode lead-out hole is slightly larger than the diameter of the electrode post 3, allowing the electrode post 3 to be easily installed. The electrode post 3 is used to realize the electrical connection between the internal electrodes of the battery cell and the external circuit, thereby realizing the output or input of current and realizing the charging and discharging function of the battery cell.

[0030] In addition to electrode lead-out holes, the cover plate 1 may also have various functional structures such as liquid injection holes, explosion-proof valves, and positioning holes. The specific configuration depends on the actual needs of the battery cell, and this embodiment does not impose any restrictions on this.

[0031] The cover plate 1 has an upper surface and a lower surface. After the cover plate 1 is connected to the housing to form a battery cell, the side of the cover plate 1 closest to the inner electrode core of the housing is the lower surface of the cover plate 1, and the side of the cover plate 1 away from the inner electrode core of the housing is the upper surface of the cover plate 1. A fixing ring 2 is provided on one side of the upper surface of the cover plate 1. The fixing ring 2 is used to fix and connect with the electrode post 3 to improve the stability of the electrode post 3 in the electrode lead-out hole, thereby ensuring the stable conduction of current during the charging and discharging of the battery cell. At the same time, the fixing ring 2 can also serve as a reference component during the assembly of the electrode post 3 to ensure the positional accuracy of the electrode post 3 in the electrode lead-out hole, thereby improving assembly accuracy and efficiency.

[0032] In existing technologies, the terminal post 3 and the fixing ring 2 are typically connected by welding or riveting. With welding, the positive and negative terminal posts 3 are made of different materials (e.g., the positive terminal post 3 is typically aluminum, and the negative terminal post 3 is typically copper), making direct welding to the fixing ring 2 difficult and unreliable. Therefore, some methods use a composite material for one of the terminal posts 3. For example, the negative terminal post 3 uses a copper-aluminum composite material, with the bottom of the negative terminal post 3 made of copper and the top of aluminum, thus ensuring reliable welding of the positive and negative terminal posts 3. However, the composite material process is complex and costly, significantly increasing the connection cost between the terminal post 3 and the fixing ring 2. With riveting, the contact resistance between the terminal post 3 and the fixing ring 2 is high, leading to a faster temperature rise of the terminal post 3 during battery cell charging and discharging, affecting the charging and discharging performance of the battery cell. Furthermore, the connection reliability between the terminal post 3 and the fixing ring 2 is also reduced in this method.

[0033] Based on this, the fixing ring 2 in this embodiment includes a bent portion 21, which is located on the side of the fixing ring 2 near its center. At least a portion of the bent portion 21 passes through the electrode lead-out hole, and at least a portion of the outer peripheral surface of the electrode post 3 contacts the bent portion 21. The bent portion 21 can extend along the first direction Z to better fit the electrode lead-out hole extending along the first direction Z. The bent portion 21 can also extend in a direction inclined to the first direction Z, thereby making inclined contact with the outer peripheral surface of the electrode post 3. The outer peripheral surface of the electrode post 3 refers to the surface of the electrode post 3 surrounding the first direction Z. If the dimension of the bent portion 21 along the first direction Z is short, then a portion of the outer peripheral surface of the electrode post 3 contacts the bent portion 21; if the dimension of the bent portion 21 along the first direction Z is long, then the entire outer peripheral surface of the electrode post 3 may contact the bent portion 21. This embodiment does not limit the specific contact method.

[0034] The pole post 3 and the fixing ring 2 are fixedly connected by riveting. In order to prevent the pole post 3 from separating from the fixing ring 2, the riveting process can be carried out on the top of the pole post 3. That is, by stamping the middle position of the top of the pole post 3, the material at the top of the pole post 3 is squeezed outward to be interference-fitted with the fixing ring 2. The fixing ring 2 can be provided with a groove structure on the side near its center to accommodate the material squeezed on the top of the pole post 3, and at the same time, it can play a certain axial limiting role.

[0035] The battery top cover in this embodiment abandons the traditional welding method, which helps reduce the connection cost between the terminal post 3 and the fixing ring 2. Simultaneously, the bending portion 21 increases the contact area and friction between the terminal post 3 and the fixing ring 2, thereby improving the connection stability and reliability between them. Furthermore, the contact between the outer circumferential surface of the terminal post 3 and the bending portion 21 forms a good conductive path, which helps reduce contact resistance during current conduction, thereby reducing energy loss, improving overcurrent capacity, and ultimately improving the charge / discharge performance and efficiency of the battery cell. Additionally, at least a portion of the bending portion 21 passes through the electrode lead-out hole, and the side of the bending portion 21 facing away from the outer circumferential surface of the terminal post 3 contacts the cover plate 1. This allows the portion of the cover plate 1 with the electrode lead-out hole to better withstand the radial force generated when the terminal post 3 is subjected to force, reducing the risk of deformation or damage to the cover plate 1 and improving the overall structural stability of the battery top cover.

[0036] Example 2 Optionally, based on the foregoing embodiments of this application, the bent portion 21 is arranged around the first direction Z to form a cylindrical structure. The cylindrical structure passes through the electrode lead-out hole, and the cylindrical structure and the electrode lead-out hole are coaxially arranged, that is, the central axis of the cylindrical structure is collinear with the central axis of the electrode lead-out hole. The electrode post 3 passes through the cylindrical structure, and at least a portion of the outer peripheral surface of the electrode post 3 contacts the inner wall of the cylindrical structure.

[0037] By adopting the above configuration, compared to partial contact, the contact area and contact uniformity between the electrode post 3 and the fixing ring 2 can be significantly increased, improving the phenomenon of local pressure concentration. This helps to reduce wear on the outer peripheral surface of the electrode post 3 and the surface of the bending portion 21, further improving the stability of the electrode post 3 under stress. In addition, the cylindrical bending portion 21 can make the current conduction path more dispersed and uniform, further reducing contact resistance, reducing energy loss, and improving overcurrent capacity, thereby further improving the charge and discharge performance and efficiency of the battery cell. Furthermore, the cylindrical bending portion 21 itself has high radial stiffness, which can better resist the radial force generated when the electrode post 3 is under stress, reducing the risk of deformation or damage to the cover plate 1, thereby further improving the overall structural stability of the battery top cover.

[0038] Alternatively, in some embodiments of this application, the number of bent portions 21 is two or more, and the two or more bent portions 21 are arranged at intervals around the first direction Z. The interval between two adjacent bent portions 21 may be the same or different, and this embodiment does not limit this. This arrangement is beneficial for controlling the amount of material used in the fixing ring 2, thereby controlling the cost of the battery top cover, and at the same time, it is beneficial for reducing the weight of the fixing ring 2, thus making it more conducive to the lightweight design of the battery top cover.

[0039] Example 3 Optionally, based on the foregoing embodiments of this application, the dimension of the bending portion 21 along the first direction Z is 2mm-5mm. For example, the dimension of the bending portion 21 along the first direction Z is 2mm, 3mm, 4mm, 5mm, etc. In conventional methods, the dimension of the contact area between the pole post 3 and the fixing ring 2 in the first direction Z is typically 1mm-2mm, resulting in a very limited effective contact area. However, by adopting the contact method between the pole post 3 and the bending portion 21 in the embodiments of this application, the dimension of the contact area between the pole post 3 and the fixing ring 2 in the first direction Z can be significantly increased, thereby effectively increasing the contact area between the pole post 3 and the fixing ring 2, improving the connection stability and reliability between the pole post 3 and the fixing ring 2, reducing contact resistance during current conduction, reducing energy loss, and improving overcurrent capacity.

[0040] In addition, in this embodiment, the bending portion 21 is set to a size of 2mm-5mm along the first direction Z, which can ensure effective contact between the pole post 3 and the fixing ring 2, and avoid the increase in material usage and weight of the fixing ring 2 due to excessive size.

[0041] Example 4 Optionally, based on the foregoing embodiments of this application, refer to Figure 2 The outer peripheral surface of the pole post 3 is provided with a first protrusion 41, and the first protrusion 41 is in interference fit with the bending portion 21; or, the surface of the bending portion 21 near the pole post 3 is provided with a first protrusion 41, and the first protrusion 41 is in interference fit with the pole post 3.

[0042] Specifically, the first protrusion 41 can be a dot-shaped protrusion, a line-shaped protrusion, a block-shaped protrusion, or a protrusion with an arbitrary polygonal structure. In one embodiment, the outer peripheral surface of the pole post 3 is provided with the first protrusion 41, and the first protrusion 41 is interference-fitted with the bending portion 21. In another embodiment, the surface of the bending portion 21 near the pole post 3 is provided with the first protrusion 41, and the first protrusion 41 is interference-fitted with the outer peripheral surface of the pole post 3. In any of the above embodiments, the first protrusion 41 should be able to undergo a certain amount of elastic deformation to reduce wear on the surface of the pole post 3 or the bending portion 21, while also accommodating certain assembly tolerances. In both of the above embodiments, the first protrusion 41 can form a radial clamping force between the pole post 3 and the bending portion 21, preventing rotation between them, thereby further improving the connection reliability between the pole post 3 and the bending portion 21.

[0043] In addition, in this embodiment, the number of first protrusions 41 can be one, two or more. Multiple first protrusions 41 can be arranged at intervals along the first direction Z, or arranged at intervals around the first direction Z. Alternatively, some first protrusions 41 can be arranged at intervals along the first direction Z, and some first protrusions 41 can be arranged at intervals around the first direction Z. This embodiment does not limit the specific number and arrangement of the first protrusions 41.

[0044] Example 5 Optionally, based on the foregoing embodiments of this application, refer to Figure 2 The first protrusion 41 extends along the first direction Z to form an edge. The edge can form a continuous linear interference contact, making the contact area more coherent and more conducive to the uniform distribution of radial clamping force. This avoids excessive deformation of the electrode post 3 or the bending part 21 due to excessive local pressure at the interference connection part, thus making it easier for the electrode post 3 to maintain a stable fit with the bending part 21. In addition, the edge provided along the first direction Z can play a guiding and positioning role when the electrode post 3 is assembled into the electrode lead-out hole, thereby helping to improve the assembly accuracy of the electrode post 3.

[0045] Example 6 Optionally, based on the foregoing embodiments of this application, the dimension of the edge along the first direction Z does not exceed 0.5 mm. Specifically, if the dimension of the edge along the first direction Z is too large, it will increase the thrust required when the electrode post 3 is assembled to the electrode lead-out hole, which can easily cause deformation of the electrode post 3 and the bending part 21, and also easily generate a large amount of debris. Therefore, in this embodiment, the dimension of the edge along the first direction Z is set to not exceed 0.5 mm to avoid the above-mentioned phenomena.

[0046] Example 7 Optionally, based on the foregoing embodiments of this application, refer to Figure 1 and Figure 2The electrode post 3 includes a column portion 31 and a disk portion 32. The disk portion 32 is connected to one end of the column portion 31 along the first direction Z. Along the radial direction of the electrode lead-out hole, the radial dimension of the disk portion 32 is larger than the radial dimension of the column portion 31. The surface of the disk portion 32 near the column portion 31 is provided with a second protrusion 42, and the second protrusion 42 is interference-fitted with the bending portion 21. Alternatively, the bending portion 21 is provided with a second protrusion 42 at one end along the first direction Z, and the second protrusion 42 is interference-fitted with the disk portion 32.

[0047] Specifically, the disc portion 32 is connected to one end of the column portion 31 along the first direction Z. Assuming that the remaining part of the fixing ring 2, excluding the bent portion 21, is a ring portion, the disc portion 32 and the ring portion are distributed on both sides of the cover plate 1 along the first direction Z. The disc portion 32 is used to connect with the tab of the electrode core, thereby realizing the electrical connection between the internal electrode of the battery cell and the external circuit, thus realizing the charging and discharging function of the battery cell. Along the radial direction of the electrode lead-out hole, the radial dimension of the disc portion 32 is larger than the radial dimension of the column portion 31, so that the disc portion 32 can play an axial limiting role and improve the installation stability of the electrode post 3.

[0048] In one embodiment, the surface of the disc portion 32 near the pillar portion 31 is provided with a second protrusion 42, which is interference-fitted with the bent portion 21. Similarly, the second protrusion 42 can be a dot-shaped protrusion, a line-shaped protrusion, a block-shaped protrusion, or a protrusion with an arbitrary polygonal structure. In another embodiment, the bent portion 21 is provided with a second protrusion 42 at one end along the first direction Z, which is interference-fitted with the disc portion 32. In any of the above embodiments, the second protrusion 42 should be able to undergo a certain amount of elastic deformation to reduce wear on the surface of the pole post 3 or the bent portion 21, while also accommodating certain assembly tolerances. By adopting the above configuration, the contact area and contact strength between the pole post 3 and the fixing ring 2 can be further increased, thereby improving the reliability of their connection.

[0049] Example 8 Optionally, based on the foregoing embodiments of this application, refer to Figure 1 and Figure 2 The second protrusion 42 is arranged around the first direction Z to form a convex ring; or, the number of the second protrusion 42 is multiple, and the multiple second protrusions 42 are arranged at intervals around the first direction Z.

[0050] Specifically, there can be one second protrusion 42. The second protrusion 42 is arranged around the first direction Z to form a convex ring. In this way, the area of ​​the second protrusion 42 and the bending part 21 or the disc part 32 is maximized, and the convex ring is more conducive to the uniform distribution of force, thereby further improving the connection reliability between the pole post 3 and the fixing ring 2.

[0051] Alternatively, the number of second protrusions 42 can be two or more, and the multiple second protrusions 42 can be arranged at intervals around the first direction Z. The interval between two adjacent second protrusions 42 can be the same or different, and this embodiment does not limit this. In this way, it is beneficial to control the amount of material used in the second protrusions 42, thereby controlling the cost of the battery top cover, and at the same time, it is beneficial to reduce the overall weight of the battery top cover.

[0052] Example 9 Optionally, based on the foregoing embodiments of this application, refer to Figure 1 and Figure 2 The battery top cover also includes a sealing ring 5, which is disposed between the disc body portion 32 and the cover plate 1; a portion of the sealing ring 5 extends radially along the electrode lead-out hole and abuts against the disc body portion 32, and another portion of the sealing ring 5 extends along the first direction Z and abuts against the bent portion 21.

[0053] Specifically, such as Figure 2 As shown, the sealing ring 5 includes a first sealing part 51 and a second sealing part 52. The first sealing part 51 extends radially along the electrode lead-out hole and abuts against the surface of the disc part 32 near the cover plate 1. This seals the gap between the disc part 32 and the cover plate 1, preventing electrolyte leakage. Simultaneously, when the electrode post 3 is subjected to axial force, the second sealing part 52 also provides a buffering effect, further reducing the risk of deformation or damage to the lower surface of the cover plate 1 and improving the overall structural stability of the battery top cover. The second sealing part 52 extends along the first direction Z and abuts against the surface of the bent part 21 opposite to the column part 31. This seals the gap between the bent part 21 and the cover plate 1, preventing electrolyte leakage. Simultaneously, when the electrode post 3 is subjected to radial force, the second sealing part 52 also provides a buffering effect, further reducing the risk of deformation or damage to the part of the cover plate 1 where the electrode lead-out hole is located, and improving the overall structural stability of the battery top cover.

[0054] Furthermore, in some embodiments of this application, reference is made to Figure 1 The battery top cover also includes an upper plastic 61 and a lower plastic 62. The upper plastic 61 and lower plastic 62 are typically made of insulating plastics such as polypropylene or polybutylene terephthalate, and are key insulating and protective components on the cover plate 1. The upper plastic 61 is located between the fixing ring 2 and the upper surface of the cover plate 1, providing insulation between the upper surface of the cover plate 1 and the fixing ring 2. The lower plastic 62 is connected to the lower surface of the cover plate 1, providing insulation between the lower surface of the cover plate 1 and the housing. The arrangement of the upper plastic 61 and lower plastic 62 effectively prevents short circuits caused by electrical contact between the inside and outside of the battery cell, ensuring the safe use of the battery cell.

[0055] Optionally, in Example 10, based on the aforementioned embodiments of this application, the electrode post 3 includes a positive electrode post 3 and a negative electrode post 3, wherein the negative electrode post 3 is made of pure copper. Specifically, in the case where the electrode post 3 is welded to the fixing ring 2, the negative electrode post 3 is made of copper-aluminum composite material to ensure the reliability of the weld. However, the copper-aluminum composite material process is complex and costly, which would significantly increase the connection cost between the electrode post 3 and the fixing ring 2. Since this application abandons the welding method between the electrode post 3 and the fixing ring 2, the negative electrode post 3 is made of pure copper material to save the cost of the electrode post 3, thereby reducing the overall cost of the battery top cover.

[0056] It should be noted that the battery top cover involved in the above embodiments may include at least one of Embodiments 1 to 10. For example, Embodiment 1 can be implemented as an independent embodiment; Embodiment 1+2 can be implemented as an independent embodiment; Embodiment 1+3 or Embodiment 1+2+3 can be implemented as an independent embodiment; Embodiment 1+4, Embodiment 1+2+4 or Embodiment 1+2+3+4 can be implemented as an independent embodiment; Embodiment 1+2+3+4+5 can be implemented as an independent embodiment; Embodiment 1+2+3+4+5+6 can be implemented as an independent embodiment; Embodiment 1+7, Embodiment 1+2+7, Embodiment 1+3+7, and Embodiment 1+2+7 can be implemented as independent embodiments. Examples 1+2+3+7, Examples 1+4+7, Examples 1+2+4+7, Examples 1+2+3+4+7, Examples 1+2+3+4+5+7, and Examples 1+2+3+4+5+6+7 can be implemented as independent examples; Examples 1+7+8, Examples 1+2+7+8, Examples 1+3+7+8, Examples 1+2+3+7+8, Examples 1+4+7+8, Examples 1+2+4+7+8, Examples 1+2+3+4+7+8, and Examples 1+2+3+4+5+7 +8. Examples 1, 2, 3, 4, 5, 6, 7, and 8 can be implemented as independent examples; Examples 1, 7, 9, 1, 2, 7, 9, 1, 3, 7, 9, 1, 2, 3, 7, 9, 1, 4, 7, 9, 1, 2, 4, 7, 9, 1, 2, 3, 4, 7, 9, 1, 2, 3, 4, 5, 7, 9, 1, 2, 3, 4, 5, 6, 7, 9 can be implemented as independent examples; Examples 1, 10, 1, 2, 10, ... Examples 1+3+10, 1+2+3+10, 1+4+10, 1+2+4+10, 1+2+3+4+10, 1+2+3+4+5+10, 1+2+3+4+5+6+10, 1+2+3+4+5+6+7+10, 1+2+3+4+5+6+7+8+10, and 1+2+3+4+5+6+7+9+10 can be implemented as independent embodiments, etc., but are not limited to these, and will not be exemplified here.

[0057] Example 11 Secondly, this application provides a battery cell including a housing, an electrode core, and a battery top cover according to any of the foregoing embodiments. The housing has a receiving cavity, the electrode core is disposed in the receiving cavity, and the battery top cover is fixedly connected to the housing to cover the receiving cavity.

[0058] Specifically, the electrode core, as the core component for charging and discharging a single battery cell, has tabs extending from its positive or negative electrode plate. These tabs are electrically connected to the terminal post 3, and the portion of the terminal post 3 exposed on the cover plate 1 is electrically connected to an external circuit to achieve charging and discharging of the battery cell. The electrode core is housed within the housing cavity, and the battery top cover is fixedly connected to the housing. This fixed connection can be achieved through methods including, but not limited to, fastener assembly, welding, etc. The battery top cover seals the housing cavity, protecting the electrode core from external environmental influences and ensuring the performance of the battery cell. Using the battery top cover of any of the aforementioned embodiments helps reduce the manufacturing cost of the battery cell and improves its structural stability and reliability.

[0059] Example 12 Thirdly, embodiments of this application provide a battery pack, including the battery top cover of any of the foregoing embodiments, or including the aforementioned battery cells. The advantages of the battery pack in this embodiment are similar to those of the aforementioned battery top cover or battery cells, and will not be repeated here.

[0060] In a fourth aspect of Embodiment 13, this application provides a vehicle including the aforementioned battery pack. The advantages of the vehicle in this embodiment are similar to those of the aforementioned battery pack, and will not be repeated here. The vehicle in this embodiment may include pure electric vehicles, hybrid vehicles, range-extended vehicles, and gasoline vehicles, etc., and this embodiment does not limit the specific type of vehicle. The vehicle type may also include small cars, mid-size cars, sedans, trucks, trailers, CDVs (Car Derived Vans), MPVs (Multi-Purpose Vehicles), SUVs (Sport Utility Vehicles), etc., and this embodiment does not limit the specific type of vehicle.

[0061] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery top cover, characterized in that, include: Cover plate (1), the cover plate (1) is provided with electrode lead-out holes arranged along the first direction (Z); The fixing ring (2) includes a bent portion (21), at least a portion of which passes through the electrode lead-out hole; The electrode post (3) is inserted through the electrode lead-out hole, and at least a portion of the outer peripheral surface of the electrode post (3) is in contact with the bent portion (21).

2. The battery top cover according to claim 1, characterized in that, The bent portion (21) is arranged around the first direction (Z) to form a cylindrical structure.

3. The battery top cover according to claim 1 or 2, characterized in that, The bending portion (21) has a dimension of 2mm-5mm along the first direction (Z).

4. The battery top cover according to any one of claims 1-3, characterized in that, The outer peripheral surface of the pole post (3) is provided with a first protrusion (41), and the first protrusion (41) is in interference fit with the bending portion (21); or, the surface of the bending portion (21) near the pole post (3) is provided with a first protrusion (41), and the first protrusion (41) is in interference fit with the pole post (3).

5. The battery top cover according to claim 4, characterized in that, The first protrusion (41) extends along the first direction (Z) to form an edge.

6. The battery top cover according to claim 5, characterized in that, The dimension of the edge along the first direction (Z) does not exceed 0.5 mm.

7. The battery top cover according to any one of claims 1-6, characterized in that, The electrode post (3) includes a column part (31) and a disk part (32), the disk part (32) being connected to one end of the column part (31) along the first direction (Z); along the radial direction of the electrode lead-out hole, the radial dimension of the disk part (32) is greater than the radial dimension of the column part (31); The surface of the disc portion (32) near the column portion (31) is provided with a second protrusion (42), and the second protrusion (42) is in interference fit with the bending portion (21); or, the bending portion (21) is provided with a second protrusion (42) at one end along the first direction (Z), and the second protrusion (42) is in interference fit with the disc portion (32).

8. The battery top cover according to claim 7, characterized in that, The second protrusion (42) is arranged around the first direction (Z) to form a protruding ring; or, the number of the second protrusion (42) is multiple, and the multiple second protrusions (42) are arranged at intervals around the first direction (Z).

9. The battery top cover according to claim 7, characterized in that, Also includes: A sealing ring (5) is disposed between the disk body portion (32) and the cover plate (1); a portion of the sealing ring (5) extends radially along the electrode lead-out hole and abuts against the disk body portion (32), and another portion of the sealing ring (5) extends along the first direction (Z) and abuts against the bent portion (21).

10. The battery top cover according to any one of claims 1-9, characterized in that, The electrode (3) includes a positive electrode (3) and a negative electrode (3), wherein the negative electrode (3) is made of pure copper.

11. A single battery cell, characterized in that, The battery includes a housing, an electrode core, and a battery top cover as described in any one of claims 1-10, wherein the housing has a receiving cavity, the electrode core is disposed in the receiving cavity, and the battery top cover is fixedly connected to the housing to cover the receiving cavity.

12. A battery pack, characterized in that, Includes the battery top cover as described in any one of claims 1-10, or includes the battery cell as described in claim 11.

13. A vehicle, characterized in that, Includes the battery pack as described in claim 12.

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