Battery and vehicle

Abstract

The utility model provides a battery and a vehicle, and relates to the technical field of batteries. The battery comprises a shell, a battery cell and a pole. The battery cell is arranged in the shell and is provided with a tab; the pole is electrically coupled with the tab; wherein one of the shell and the pole is provided with a limiting groove, the other one of the shell and the pole is provided with a limiting bulge matched with the limiting groove, and the limiting bulge is embedded into the limiting groove. By arranging the limiting bulge on one of the pole and the shell, arranging the limiting groove on the other of the pole and the shell, and embedding the limiting bulge into the limiting groove, the pole and the shell are relatively fixed, so that the relative movement of the pole can be limited to a certain extent, and the assembling stability of the pole is improved; and the pole is in stable contact with the conductive part connected with the pole, so that the over-current stability can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery and a vehicle. Background Technology

[0002] In related technologies, the terminal post is mounted on the end cap and is electrically connected to the tabs of the battery cell and other conductive components outside the battery (such as the electrode pads) to conduct current. Currently, the assembly stability of the terminal post is insufficient, which leads to unstable contact between the terminal post and the connected conductive components, resulting in insufficient overcurrent stability. Utility Model Content

[0003] Embodiments of this application provide a battery and a vehicle for improving the assembly stability of the terminals, thereby ensuring stable contact between the terminals and the conductive components connected thereto, and improving overcurrent stability.

[0004] In a first aspect, embodiments of this application provide a battery, including a casing, a battery cell, and terminals. The battery cell is disposed within the casing and has tabs; the terminals are electrically coupled to the tabs; wherein, one of the casing and the terminals is provided with a limiting groove, and the other is provided with a limiting protrusion that cooperates with the limiting groove, the limiting protrusion being embedded in the limiting groove.

[0005] In one possible implementation, the limiting groove is disposed on the pole post, and the limiting protrusion is disposed on the outer shell.

[0006] In one possible implementation, the outer surface of the housing is provided with a roller groove, and the inner surface of the housing forms the limiting protrusion corresponding to the position of the roller groove.

[0007] In one possible implementation, the depth of the roller groove is H, which satisfies 1mm≤H≤2.5mm.

[0008] In one possible implementation, the outer casing is cylindrical and includes a first end wall, a second end wall, and a side wall. The first end wall and the second end wall are spaced apart along the height direction of the battery. One end of the side wall is connected to the first end wall, and the other end is connected to the second end wall. The side wall, the first end wall, and the second end wall define an internal space for accommodating the battery cell. At least one of the first end wall and the second end wall is integrally formed with the side wall. The first end wall is provided with a clearance hole for partially exposing the electrode post. The roller groove is provided on the side wall.

[0009] In one possible implementation, multiple roller grooves are provided, and the multiple roller grooves are spaced apart along the height direction of the battery.

[0010] In one possible implementation, the roller groove extends circumferentially around the sidewall.

[0011] In one possible implementation, the sidewall is provided with a pressure relief section, which is configured to release emissions from the battery when the temperature or pressure inside the battery reaches a threshold.

[0012] In one possible implementation, the pressure relief portion extends circumferentially around the sidewall.

[0013] In one possible implementation, the diameter of the pole is L1 and the diameter of the outer casing is L2, satisfying 90% ≤ L1 / L2 ≤ 99%.

[0014] In one possible implementation, 82mm≤L1≤86mm.

[0015] In one possible implementation, the tab is welded to the pole post.

[0016] In one possible implementation, the battery further includes an insulating element disposed between the housing and the terminal post for insulating the housing from the terminal post.

[0017] Secondly, embodiments of this application provide a vehicle including the battery provided in any embodiment of the first aspect.

[0018] The beneficial effects of the embodiments of this application are as follows:

[0019] In the embodiments of this application, by providing a limiting protrusion on one of the electrode and the housing, and a limiting groove on the other, and embedding the limiting protrusion into the limiting groove, the electrode and the housing are kept relatively fixed. This can limit the relative movement of the electrode to a certain extent and improve the assembly stability of the electrode. As a result, the electrode and the conductive components connected thereto are in stable contact, which helps to improve the overcurrent stability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A three-dimensional schematic diagram of a battery provided for an embodiment of this application;

[0022] Figure 2 A front view of a battery provided for an embodiment of this application;

[0023] Figure 3A top view of a battery provided for an embodiment of this application;

[0024] Figure 4 for Figure 2 Sectional view along AA;

[0025] Figure 5 for Figure 4 Enlarged view of section A in the middle;

[0026] Figure 6 This is a schematic diagram of the pole structure provided in an embodiment of this application;

[0027] Figure 7 This is a partial structural diagram of the battery's internal structure provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100 - Battery; 10 - Housing; 11 - Side wall; 12 - First end wall; 13 - Roller groove; 14 - Limiting protrusion; 15 - Pressure relief part; 16 - Clearance hole; 17 - Second end wall;

[0030] 20-Battery cell; 21-Electrical tab; 22-Body unit;

[0031] 30 - pole post; 31 - limiting groove;

[0032] 40 - Insulating components. Detailed Implementation

[0033] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0034] In related technologies, the battery end cap has mounting holes, and the terminals are assembled by passing through these holes. However, this connection method lacks a limiting structure, resulting in insufficient stability of the terminal installation. Unstable terminal installation leads to unstable contact between the terminal and the connected conductive components, which in turn causes unstable overcurrent.

[0035] In view of this, in a first aspect, embodiments of this application provide a battery 100.

[0036] Reference Figures 1 to 5 , Figure 1 A perspective view of the battery 100 provided for an embodiment of this application; Figure 2 A front view of the battery 100 provided for an embodiment of this application; Figure 3 A top view of the battery 100 provided for an embodiment of this application; Figure 4 for Figure 2 Sectional view along AA; Figure 5 for Figure 4 Enlarged view of part A in the middle. Battery 100 includes casing 10, cell 20 and terminals 30.

[0037] The battery cell 20 is disposed inside the housing 10. The battery cell 20 has a tab 21, and the terminal post 30 is electrically coupled to the tab 21. The housing 10 and the terminal post 30 are provided with a limiting groove 31, and the other is provided with a limiting protrusion 14 that cooperates with the limiting groove 31. The limiting protrusion 14 is embedded in the limiting groove 31.

[0038] The base material of the outer shell 10 can be steel.

[0039] The battery cell 20 can be a wound structure, which is formed by winding together a positive electrode plate, a separator, and a negative electrode plate stacked on top of each other. The positive electrode plate is connected to the positive electrode tab, and the negative electrode plate is connected to the negative electrode tab.

[0040] It is understood that the terminal 30 mentioned in the embodiments of this application can be a positive terminal or a negative terminal. If the terminal 30 is a positive terminal, then the tab 21 connected to it is a positive tab; if the terminal 30 is a negative terminal, then the tab 21 connected to it is a negative tab.

[0041] It is understandable that the battery 100 can have one terminal 30 or two terminals 30 with opposite polarities. For example, the battery 100 may have one positive terminal, with the outer casing 10 serving as the negative terminal, which is electrically connected to the negative tab of the cell 20; or the battery 100 may have one positive terminal and one negative terminal, which are respectively located at opposite ends of the battery 100, with the positive terminal connected to the positive tab of the cell 20 and the negative terminal connected to the negative tab of the cell 20.

[0042] For example, such as Figures 1 to 5 As shown, the battery 100 is a cylindrical battery 100, and the outer casing 10 is cylindrical, with the positive terminal and the negative terminal respectively disposed at both ends of the outer casing 10 along the axial direction.

[0043] The shape of the limiting protrusion 14 is adapted to the shape of the limiting groove 31. In one example, the limiting protrusion 14 extends around the circumference of the battery 100 to form a closed annular structure; in another example, the terminal post 30 is provided with a plurality of limiting protrusions 14, which are arc-shaped and are spaced apart around the circumference of the terminal post 30.

[0044] In this embodiment, by providing a limiting protrusion 14 on one of the electrode post 30 and the outer shell 10, and a limiting groove 31 on the other, and embedding the limiting protrusion 14 into the limiting groove 31, the electrode post 30 and the outer shell 10 are kept relatively fixed. This can limit the relative movement of the electrode post 30 to a certain extent and improve the assembly stability of the electrode post 30. As a result, the electrode post 30 and the conductive components connected thereto are in stable contact, which helps to improve the overcurrent stability.

[0045] In some embodiments, a limiting groove 31 is disposed on the pole post 30, and a limiting protrusion 14 is disposed on the housing 10. This arrangement enables the housing 10 to have higher structural strength.

[0046] Reference Figure 5 In some embodiments, the outer side of the housing 10 is provided with a roller groove 13, and the inner side of the housing 10 is provided with a limiting protrusion 14 corresponding to the position of the roller groove 13.

[0047] It is understandable that the extrusion bonding force generated by the roller groove 13 can tightly bond it with the pole post 30. This setting can reduce the manufacturing difficulty of the limiting protrusion 14 on the one hand; on the other hand, it can make the outer shell 10 have high bending stiffness, improve the ability of the outer shell 10 to resist deformation, and thus improve the overall structural strength of the battery 100.

[0048] It is understood that the outer surface of the outer shell 10 can be pressed by a roller to form a roller groove 13 on the outer surface of the outer shell 10, while a limiting protrusion 14 corresponding to the roller groove 13 is formed on the inner surface of the outer shell 10.

[0049] In the specific preparation process, a limiting groove 31 can be processed on the outer peripheral surface of the pole post 30. Then, the pole post 30 is assembled into the outer shell 10. Roller is used to perform a rolling operation on the outer surface of the outer shell 10 at the position corresponding to the limiting groove 31, thereby forming a roller groove 13. This causes part of the structure of the outer shell 10 to be embedded in the limiting groove 31 due to the deformation caused by the rolling.

[0050] Reference Figure 5 In some embodiments, the depth of the roller groove 13 is H, satisfying 1mm≤H≤2.5mm. With this setting, the depth of the roller groove 13 is appropriate, which can not only limit the movement of the pole post 30 to a certain extent and improve the assembly stability of the pole post 30, but also facilitate the assembly of the pole post 30 into the housing 10, reducing the assembly difficulty of the pole post 30 and the housing 10.

[0051] For example, the depth of the roller groove 13 can be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.9 mm, 2 mm, 2.1 mm, 2.3 mm, 2.4 mm, 2.5 mm and any value in between.

[0052] In some embodiments, the outer casing 10 is cylindrical and includes a first end wall 12, a second end wall 17, and a side wall 11. The first end wall 12 and the second end wall 17 are spaced apart along the height direction of the battery 100. One end of the side wall 11 is connected to the first end wall 12, and the other end is connected to the second end wall 17. The side wall 11, the first end wall 12, and the second end wall 17 define an internal space for accommodating the battery cell 20. At least one of the first end wall 12 and the second end wall 17 is integrally formed with the side wall 11. The first end wall 12 is provided with a clearance hole 16 for partially exposing the terminal post 30, and a roller groove 13 is provided on the side wall 11.

[0053] It can be understood that the height direction of battery 100 is the axial direction of battery 100.

[0054] It is understandable that the side wall 11 is the circumferential surface of the outer shell 10.

[0055] In one example, the pole post 30 passes through the clearance hole 16 of the first end wall 12, and the top surface of the pole post 30 protrudes from the first end wall 12 to facilitate the connection of the pole post 30 with the bar.

[0056] In one example, the first end wall 12, the side wall 11, and the second end wall 17 are integrally formed. This arrangement helps to improve the structural strength of the housing 10 and reduce the number of parts.

[0057] Specifically, along the height direction of the battery 100, the projection of the first end wall 12 at least partially overlaps with the projection of the terminal post 30, and the first end wall 12 abuts against the side of the terminal post 30 away from the cell 20. With this configuration, the first end wall 12 can restrict the terminal post 30 from detaching from the casing 10 along the height direction of the battery 100, thereby improving the assembly stability of the terminal post 30.

[0058] In this embodiment of the application, by integrally forming at least one of the first end wall 12 and the second end wall 17 with the side wall 11, it is helpful to improve the structural strength of the outer shell 10.

[0059] In this embodiment, by providing the roller groove 13 on the side wall 11, the limiting protrusion 14 corresponding to the position of the roller groove 13 on the inner surface of the side wall 11 can support the electrode post 30 along the height direction of the battery 100. Thus, the outer shell 10 can not only restrict the movement of the electrode post 30 along the height direction of the battery 100, but also provide support for the electrode post 30, which helps to improve the structural stability of the battery 100.

[0060] In some embodiments, multiple roller grooves 13 are provided, and the multiple roller grooves 13 are spaced apart along the height direction of the battery 100.

[0061] Reference Figure 6 and Figure 6 , Figure 6This is a schematic diagram of the structure of the electrode post 30 provided in an embodiment of this application. Exemplarily, the outer surface of the sidewall 11 is provided with two roller grooves 13, which are spaced apart along the height direction of the battery 100. Correspondingly, the inner surface of the sidewall 11 is provided with two limiting protrusions 14, and the electrode post 30 is provided with two limiting grooves 31. Each limiting protrusion 14 corresponds to and is embedded in its corresponding limiting groove 31.

[0062] In some embodiments, the roller groove 13 extends circumferentially around the sidewall 11. This arrangement not only improves the assembly stability of the pole post 30 but also helps to reduce the manufacturing difficulty of the roller groove 13.

[0063] Reference Figure 5 In some embodiments, the battery 100 further includes an insulating member 40 disposed between the housing 10 and the terminal post 30 for insulating the housing 10 from the terminal post 30.

[0064] It is understood that the shape of the insulating member 40 is adapted to the shape of the limiting groove 31 and the limiting protrusion 14. Exemplarily, the insulating member 40 is disposed around the periphery of the terminal post 30. When the roller groove 13 is provided on the outer surface of the sidewall 11, the extrusion bonding force generated by the roller groove 13 can tightly bond the housing 10, the insulating member 40 and the terminal post 30 together, which helps to improve the structural stability of the battery 100.

[0065] The insulating component 40 can be made of materials such as plastic or rubber.

[0066] In some embodiments, the sidewall 11 is provided with a pressure relief section 15, which is configured to release emissions from inside the battery 100 when the temperature or pressure inside the battery 100 reaches a threshold.

[0067] It is understood that the emissions from battery 100 are substances released when battery 100 experiences thermal runaway. The emissions from battery 100 include, but are not limited to, high-temperature, high-pressure gases and particulate matter.

[0068] The pressure relief section 15 is a pressure relief structure on the outer casing 10, which forms a pressure relief channel when the battery 100 experiences thermal runaway. In one example, the pressure relief section 15 is a region on the outer casing 10 with a lower melting point than other parts. When the battery 100 experiences thermal runaway, the pressure relief section 15 will melt or thaw before other parts of the outer casing 10, making the inner and outer parts of the outer casing 10 interconnected, thereby releasing the emissions from the battery 100. In another example, the pressure relief section 15 is a region on the outer casing 10 with reduced thickness. When the battery 100 experiences thermal runaway, because the pressure relief section 15 has lower strength, it will crack before other parts of the outer casing 10, making the inner and outer parts of the outer casing 10 interconnected, thereby releasing the emissions from the battery 100.

[0069] For example, the pressure relief part 15 is a groove provided on the outer surface of the side wall 11.

[0070] In related technologies, the pressure relief section 15 is typically located on the end cap of the battery 100. However, the end cap has a small area and contains components such as the terminal post 30, which significantly limits the area where the pressure relief section 15 can be installed, thus limiting its pressure relief capacity. In this embodiment, by placing the pressure relief section 15 on the side wall 11, compared to placing it on the end cap, the pressure relief section 15 has a larger installation area, which helps improve its pressure relief capacity. Furthermore, since the pressure relief section 15 does not occupy the space of the first end wall 12, this provides space for the installation of the terminal post 30, which helps to increase the size of the terminal post 30 and improve the current carrying capacity of the battery 100.

[0071] In some embodiments, the pressure relief portion 15 extends circumferentially along the sidewall 11. This arrangement increases the pressure relief area of ​​the pressure relief portion 15, which helps to improve the pressure relief capacity and thus improve the reliability of the battery 100.

[0072] Reference Figure 7 In some embodiments, the battery cell 20 includes a body 22 and a tab 21 connected to the body 22.

[0073] In some embodiments, the roller groove 13 is provided with a pressure relief part 15 located on the side of the roller groove 13 facing the cell 20. On the same projection plane perpendicular to the radial direction of the battery 100, the projection of the pressure relief part 15 does not overlap with the projection of the body 22.

[0074] In other embodiments, multiple roller grooves 13 are provided. The roller groove 13 closest to the cell 20 among the multiple roller grooves 13 is the first roller groove. The pressure relief part 15 is located on the side of the first roller groove facing the cell 20. On the same projection plane perpendicular to the radial direction of the battery 100, the projection of the pressure relief part 15 does not overlap with the projection of the body 22.

[0075] It is understandable that the pressure relief section 15 is located near the battery cell 20.

[0076] Because the terminal post 30 and the side wall 11 of the casing 10 are in close contact, it becomes difficult for the discharge from the battery 100 near the first end wall 12 when thermal runaway occurs. In this embodiment, by placing the pressure relief section 15 near the cell 20, since there is a certain gap between the cell 20 and the casing 10, the pressure relief channel formed by the pressure relief section 15 can connect the inside and outside of the battery 100 when thermal runaway occurs, which helps to discharge the discharge from the battery 100 and improves the reliability of pressure relief.

[0077] In some embodiments, the electrode post 30 is a positive electrode post, and the pressure relief section 15 is disposed near the positive electrode post.

[0078] Typically, positive electrode materials are more prone to thermal runaway under conditions of overcharging, high temperature, or abuse. For example, lattice collapse and oxygen release in the positive electrode material can trigger a violent exothermic reaction. Therefore, placing the pressure relief section 15 near the positive electrode post, compared to placing it near the negative electrode post, allows the pressure relief section 15 to release the internal pressure of the battery 100 in a timely manner during the initial stage of thermal runaway, preventing the battery 100 from rupturing or exploding due to excessive pressure.

[0079] Reference Figure 4 In some embodiments, the battery 100 is a cylindrical battery 100, the diameter of the terminal 30 is L1, and the diameter of the outer casing 10 is L2, satisfying 90% ≤ L1 / L2 ≤ 99%. This configuration allows for an increase in the size of the terminal 30 while maintaining an appropriate thickness ratio for the outer casing 10, which helps to balance improving the current carrying capacity and structural strength of the battery 100.

[0080] It can be understood that L1 / L2 is the diameter ratio of the pole post 30 to the outer casing 10.

[0081] For example, L1 / L2 can be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99%.

[0082] In some embodiments, 82mm≤L1≤86mm. This configuration can improve the current-carrying capacity of the terminal 30 without significantly increasing the space occupied, thereby balancing the current-carrying capacity of the battery 100 and the space occupied within a limited space.

[0083] For example, L1 can be 82mm, 82.5mm, 83mm, 83.5mm, 84mm, 84.5mm, 85mm, 85.5mm, 86mm and any value in between.

[0084] In some embodiments, the battery 100 includes a current collector, with tabs 21 and terminals 30 respectively welded to the current collector, thereby achieving electrical coupling between the tabs 21 and terminals 30.

[0085] Of course, the collector disk can also be omitted, see [reference] Figure 7 , Figure 7 This is a partial structural diagram of the internal structure of the battery 100 provided in an embodiment of this application. In other embodiments, the tab 21 and the terminal post 30 are directly welded together. This arrangement simplifies the number of components.

[0086] Reference Figure 7 Part of the tab 21 is located between the insulating member 40 and the pole post 30, and the tab 21 is welded to the outer side of the pole post 30. Exemplarily, the tab 21 is welded to the outer side of the pole post 30 to form a solder mark, and the solder mark extends around the circumference of the pole post 30.

[0087] The electrode tab 21 and the electrode post 30 can be welded using laser welding.

[0088] Secondly, embodiments of this application provide a vehicle including the battery 100 provided in any embodiment of the first aspect. Since the vehicle includes the battery 100, it possesses all the beneficial effects of the battery 100, which will not be elaborated further here.

[0089] Vehicles may include, but are not limited to, battery vehicles, gasoline vehicles, and hybrid vehicles.

[0090] In the description of this application, 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0091] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0092] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0093] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery, characterized in that, include: shell; A battery cell is disposed within the housing, and the battery cell has tabs; The electrode post is electrically coupled to the electrode tab; The outer shell and the pole post are provided with a limiting groove, and the other is provided with a limiting protrusion that cooperates with the limiting groove. The limiting protrusion is embedded in the limiting groove.

2. The battery according to claim 1, characterized in that, The limiting groove is disposed on the pole post, and the limiting protrusion is disposed on the outer shell.

3. The battery according to claim 2, characterized in that, The outer surface of the housing is provided with a roller groove, and the inner surface of the housing is formed with the limiting protrusion corresponding to the position of the roller groove.

4. The battery according to claim 3, characterized in that, The depth of the roller groove is H, which satisfies 1mm≤H≤2.5mm.

5. The battery according to claim 3, characterized in that, The outer casing is cylindrical and includes a first end wall, a second end wall, and a side wall. The first end wall and the second end wall are spaced apart along the height direction of the battery. One end of the side wall is connected to the first end wall, and the other end is connected to the second end wall. The side wall, the first end wall, and the second end wall define an internal space for accommodating the battery cell. At least one of the first end wall and the second end wall is integrally formed with the side wall. The first end wall is provided with a clearance hole for partially exposing the electrode post. The roller groove is provided on the side wall.

6. The battery according to claim 5, characterized in that, The roller grooves are provided in multiple ways, and the multiple roller grooves are spaced apart along the height direction of the battery.

7. The battery according to claim 6, characterized in that, The roller groove extends circumferentially around the sidewall.

8. The battery according to claim 6, characterized in that, The sidewall is provided with a pressure relief section, which is configured to release the emissions inside the battery when the temperature or pressure inside the battery reaches a threshold.

9. The battery according to claim 8, characterized in that, The pressure relief section extends circumferentially around the sidewall.

10. The battery according to any one of claims 5-9, characterized in that, The diameter of the pole is L1, and the diameter of the outer shell is L2, satisfying 90% ≤ L1 / L2 ≤ 99%.

11. The battery according to claim 10, characterized in that, The condition is satisfied: 82mm≤L1≤86mm.

12. The battery according to any one of claims 1-9, characterized in that, The tab is welded to the pole post.

13. The battery according to any one of claims 1-9, characterized in that, The battery also includes: An insulating element is disposed between the outer casing and the pole post to insulate the outer casing from the pole post.

14. A vehicle, characterized in that, Includes the battery as described in any one of claims 1-13.

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