Insulating part for power battery, top cover assembly and power battery

Abstract

The utility model discloses an insulating part for a power battery, a top cover assembly and the power battery. The insulating part comprises a substrate part, a mounting through hole is formed in the middle of the substrate part, the mounting through hole is configured to be used for mounting a pole base, a first boss and a second boss protrude downwards from the two opposite sides of the mounting through hole of the substrate part respectively, and the first boss and the second boss are configured to press a plate body of the current collecting plate at one end of the roll core downwards. And an accommodating space is formed between the first boss and the second boss and is used for accommodating an extension handle, welded with the pole base, of the collector plate. According to the utility model, the self-discharge problem / short-circuit risk of the power battery caused by the damage of the positive and negative pole pieces of the roll core based on a convex ring pressing mode can be avoided, and the unpredictable risk caused by the damage of the internal structure compactness of the power battery due to the deformation of the collector plate can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to an insulating component, a top cover assembly, and a power battery for use in power batteries. Background Technology

[0002] Currently, lithium-ion / sodium-ion power batteries are gradually becoming mainstream products in the new energy industry due to their high energy density, good capacity consistency, and ability to support high-rate charging and discharging. More and more manufacturers are choosing to use riveted top cover structures to reduce costs and increase production capacity; however, current products have the following common problems:

[0003] 1. The riveted top cover structure of cylindrical power batteries commonly features a downward-protruding ring around the lower plastic layer to press down on the end of the current collector / core. However, since the ring itself is relatively narrow, this can cause damage to the positive and negative electrode sheets of the core due to the pressure of the small area of ​​the ring after long-term vibration during vehicle installation. This can lead to self-discharge problems or short circuit risks in the power battery. Alternatively, the pressure of the small area of ​​the ring can cause deformation of the current collector, compromising the internal structural compactness of the power battery and bringing unpredictable risks.

[0004] 2. Some cylindrical power battery manufacturers, in order to avoid the risk of the lower plastic protrusion pressing on the end of the current collector / core, directly remove the lower plastic protrusion. This causes the extension handle of the current collector to move after vibration during vehicle installation, and come into contact with the casing, resulting in a short circuit problem in the power battery. Utility Model Content

[0005] The purpose of this utility model is to provide an insulating component, a top cover assembly, and a power battery for a power battery, which can solve at least one technical problem existing in the background art.

[0006] To achieve the above objectives, this utility model provides an insulating component for a power battery. The insulating component is used to be attached to the inner side of the top cover of the power battery. The insulating component includes a base plate portion, and a mounting through hole is formed in the middle of the base plate portion. The mounting through hole is configured to mount a terminal post base. A first boss and a second boss protrude downward from opposite sides of the mounting through hole on the base plate portion. The first boss and the second boss are configured to be the disc body of a current collector at one end of a winding core. A receiving space is formed between the first boss and the second boss. The receiving space is used to accommodate the extension shank of the current collector that is welded to the terminal post base.

[0007] Optionally, the first boss is provided with a through hole for marking codes running vertically through the top and bottom.

[0008] Optionally, the second boss is provided with a through-hole extending vertically, and the side of the through-hole facing the mounting hole forms an exhaust port.

[0009] Optionally, at least one of the first boss and the second boss is provided with a through-hole that extends vertically.

[0010] Optionally, a groove is formed on the upper surface of the substrate at a position corresponding to the first boss and the second boss, the groove extends downward to the first boss or the second boss, and the leakage through hole communicates with the groove.

[0011] Optionally, the substrate portion extends downward on the other opposite sides of the mounting through hole to form convex edges, the first boss, the second boss and the convex edges on both sides together define the boundary of the receiving space, and the convex edges are configured to insulate and prevent the bent extension handle from being fooled.

[0012] Optionally, the two ends of the convex edge are respectively connected to the outer edges of the first boss and the second boss; the outer surfaces of the convex edge, the first boss and the second boss are flush with the outer edge of the substrate portion.

[0013] Optionally, the upper surface of the substrate portion is provided with two anti-rotation protrusions on opposite sides of the mounting through hole, and the anti-rotation protrusions are configured to fit into the anti-rotation groove on the inner side of the top cover.

[0014] To achieve the above objectives, this utility model provides a top cover assembly for a power battery. The top cover assembly includes a top cover, a terminal post, a riveting block, and an insulating component as described above. The top cover forms a terminal post through hole for the terminal post to pass through. The upper end of the terminal post extends out of the terminal post through hole and is riveted to the riveting block. The riveting block is insulatedly disposed on the top cover. The lower end of the terminal post forms a terminal post base located inside the top cover. The insulating component is attached and fixed to the inner side of the top cover. The terminal post base is installed in the mounting through hole of the insulating component.

[0015] To achieve the above objectives, this utility model provides a power battery, which includes a housing, a winding core, a current collector, and a top cover assembly as described above. The housing is sleeved on the outside of the winding core. The current collector includes a disc body with a full tab welded to one end of the winding core and an extension handle extending to one side from the disc body. The extension handle is placed in the receiving space, and the end of the extension handle away from the disc body is welded to the electrode base. After flipping and closing the top cover assembly, the extension handle is bent above the disc body, and the first boss and the second boss are pressed against the disc body of the current collector.

[0016] In this embodiment of the invention, the substrate portion of the insulating member has a first boss and a second boss protruding downwards from opposite sides of the mounting through hole. The first boss and the second boss are configured to press down the current collector at one end of the winding core. A receiving space is formed between the first boss and the second boss, which is used to accommodate the extension shank of the current collector that is welded to the electrode base. In this embodiment of the invention, the insulating member uses the first boss and the second boss to press down the current collector at one end of the winding core to limit the current collector and the winding core. Compared with the relatively narrow convex ring pressing down, the first boss and the second boss can have a wider and larger contact area. This can avoid damage to the positive and negative electrode sheets of the winding core based on the convex ring pressing down, which could lead to self-discharge problems / short circuit risks in the power battery. It can also avoid deformation of the current collector, which could damage the internal structural compactness of the power battery and bring unpredictable risks. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the top cover assembly of a power battery.

[0018] Figure 2 yes Figure 1 A three-dimensional structural diagram of the top cover assembly from another perspective.

[0019] Figure 3 This is a three-dimensional structural diagram of a power battery's casing, winding core, and current collector.

[0020] Figure 4 This is a three-dimensional structural diagram of the top cover assembly according to an embodiment of the present utility model.

[0021] Figure 5 This is a three-dimensional structural schematic diagram of the insulating component according to an embodiment of the present invention.

[0022] Figure 6 This is a cross-sectional structural diagram of the top cover assembly according to an embodiment of the present invention.

[0023] Figure 7 This is a cross-sectional structural diagram of the power battery according to an embodiment of the present invention.

[0024] Figure 8 This is another cross-sectional structural diagram of the power battery according to an embodiment of the present invention. Detailed Implementation

[0025] To explain in detail the technical content, structural features, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] Figure 1 and Figure 2 A top cover assembly for a power battery is shown, comprising a top cover 10', a terminal post 20', a riveting block 30', and an insulator 40'. The top cover 10' forms a terminal post through-hole (not shown) for the terminal post 20' to pass through. The upper end of the terminal post 20' extends out of the terminal post through-hole and is riveted to the riveting block 30'. The riveting block 30' is insulatedly disposed on the top cover 10'. The lower end of the terminal post 20' forms a terminal post base 21' located inside the top cover 10'. The insulator 40' is attached and fixed to the inner surface of the top cover 10', and the terminal post base 21' is mounted in the mounting through-hole 211' of the insulator 40'. A protruding ring 41' protrudes downward from the periphery of the insulator 40'.

[0028] Figure 3 An assembly of a power battery housing 50', a winding core 60', and a current collector 70' is shown. The housing 50' is fitted over the outside of the winding core 60'. The current collector 70' includes a disc body 71' with full tabs welded to one end of the winding core 60' and an extension handle 72' extending to one side from the disc body 71'. After the end of the extension handle 72' away from the disc body 71' is welded to the terminal base 21', the top cover assembly is flipped and closed (i.e., closed to the top opening end of the housing 50'), and the extension handle 72' is bent above the disc body 71', with a protruding ring 41' pressing against the current collector 70'.

[0029] However, since the convex ring 41' is relatively narrow, it can cause damage to the positive and negative electrode sheets of the core 60' after long-term vibration during vehicle installation. This can lead to self-discharge problems or short circuit risks in the power battery. Alternatively, the convex ring 41' can cause deformation of the current collector 70', which can damage the internal structural compactness of the power battery and bring unpredictable risks.

[0030] If the convex ring 41' is not provided, the extension handle 72' of the collector plate 70' will move after vehicle vibration, and come into contact with the housing 50', causing a short circuit in the power battery.

[0031] Based on the above factors, this utility model embodiment discloses an insulating component 40 for a power battery, which is used to be attached to the inner side of the top cover 10 of the power battery.

[0032] Please see Figures 4 to 8The insulating component 40 includes a base plate portion 41, a mounting through hole 42 is formed in the middle of the base plate portion 41, the mounting through hole 42 is configured to mount the pole post base 21, a first boss 43 and a second boss 44 are respectively protruding downward from opposite sides of the mounting through hole 42 on the base plate portion 41, the first boss 43 and the second boss 44 are configured to press down the disk body 71 of the current collector 70 at one end of the winding core 60, and a receiving space 45 is formed between the first boss 43 and the second boss 44, the receiving space 45 is used to receive the extension shank 72 of the current collector 70 which is welded to the pole post base 21.

[0033] In this embodiment of the present invention, the substrate portion 41 has a first boss 43 and a second boss 44 protruding downwards from opposite sides of the mounting through hole 42. The first boss 43 and the second boss 44 are configured to press down the disk body 71 of the current collector 70 at one end of the winding core 60. A receiving space 45 is formed between the first boss 43 and the second boss 44, which is used to receive the extension shank 72 of the current collector 70 welded to the terminal base 21. In this embodiment of the present invention, the insulating member 40 presses down the current collector 70 at one end of the winding core 60 through the first boss 43 and the second boss 44 to limit the current collector 70 and the winding core 60. Compared with the relatively narrow convex ring pressing down, the first boss 43 and the second boss 44 can have a wider and larger contact area. This can avoid damage to the positive and negative electrode sheets of the winding core 60 based on the convex ring pressing down, which could lead to self-discharge problems / short circuit risks in the power battery. It can also avoid deformation of the current collector 70, which could damage the internal structural compactness of the power battery and bring unpredictable risks.

[0034] In some embodiments, the first boss 43 is provided with a through-hole 431 for marking. By providing the through-hole 431 for marking on the first boss 43, after the insulating member 40 is assembled on the top cover 10, laser marking can be performed on the inner side of the top cover 10 through the through-hole 431 for marking.

[0035] It should be noted that the first boss 43 has a through-hole 431 extending vertically, but this does not mean that the through-hole 431 is completely formed on the first boss 43. In the example in the attached figure, the through-hole 431 is partially formed on the first boss 43 and partially formed on the substrate portion 41.

[0036] It should be noted that the first boss 43 does not refer to any specific boss; any boss can be defined as the first boss 43.

[0037] In some embodiments, the second boss 44 is provided with a through-hole 441 extending vertically, and the side of the through-hole 441 facing the mounting hole 42 forms an exhaust port 442. Since the exhaust port 441 has an exhaust port 442 on the side facing the mounting hole 42, it can prevent the boss from blocking the exhaust port 441 when it is pressed against the manifold 70, thus avoiding the explosion-proof valve from failing to open in time to release pressure / leading to the risk of the power battery exploding.

[0038] Specifically, the vent hole 441 is partially formed on the substrate portion 41.

[0039] It should be noted that the second boss 44 does not refer to any specific boss; any boss can be defined as the second boss 44. Furthermore, it is possible that the vent hole 441 and the marking hole 431 are located on the same boss.

[0040] In some embodiments, at least one of the first boss 43 and the second boss 44 is provided with a through-hole 46 extending vertically. Through the through-hole 46, when the power battery is inverted, the electrolyte flows into the corresponding boss. When the power battery is upright, the electrolyte in the boss can flow out from the through-hole 46 and be absorbed by the positive / negative electrode sheets of the core 60, thus avoiding the problem of liquid accumulation.

[0041] Specifically, both the first boss 43 and the second boss 44 are provided with leakage through holes 46.

[0042] Specifically, a groove 47 is formed on the upper surface of the substrate portion 41 at the position corresponding to the first boss 43 and the second boss 44. The groove 47 extends downward to the first boss 43 or the second boss 44, and the leakage through hole 46 communicates with the groove 47.

[0043] In a specific example, both the first boss 43 and the second boss 44 are provided with two leakage through holes 46. The two leakage through holes 46 on the first boss 43 are formed on opposite sides of the etched through hole 431, and the two leakage through holes 46 on the second boss 44 are formed on opposite sides of the venting through hole 441. Of course, this is not a limitation.

[0044] In some embodiments, the substrate portion 41 extends downward on the other opposite sides of the mounting through hole 42 to form protruding edge portions 48. The first boss 43, the second boss 44 and the protruding edge portions 48 on both sides together define the boundary of the receiving space 45. The protruding edge portions 48 are configured to insulate and prevent the bent extension handle 72 from being fooled, thereby effectively preventing the extension handle 72 of the current collector 70 from moving after vehicle vibration and coming into contact with the housing 50, which could lead to a short circuit in the power battery.

[0045] Specifically, the two ends of the protruding edge 48 are respectively connected to the outer edges of the first boss 43 and the second boss 44; the outer surfaces of the protruding edge 48, the first boss 43 and the second boss 44 are flush with the outer edge of the substrate portion 41. Of course, this is not a limitation.

[0046] In a specific example, corresponding to the appearance of the disc body 71 of the winding core 60 and the current collector 70, the insulating element 40 is generally circular, but is not limited to this.

[0047] In some embodiments, two anti-rotation protrusions 49 are provided on opposite sides of the mounting through hole 42 on the upper surface of the substrate portion 41. The anti-rotation protrusions 49 are configured to fit into the anti-rotation groove 11 on the inner side of the top cover 10. By means of the cooperation between the anti-rotation protrusions 49 and the anti-rotation groove 11, it is convenient to quickly assemble the insulating member 40 and the top cover 10, and it is also possible to limit relative rotation between the insulating member 40 and the top cover 10.

[0048] In some embodiments, the height h of the two protrusions of the insulating member 40 relative to the pole base 21 (i.e., the vertical distance between the bottom surface of the pole base 21 and the bottom surface of the two protrusions) is preferably 0.4 mm to 1.0 mm. The height h can be finely adjusted by adjusting the overall height H of the protrusions of the insulating member 40.

[0049] In some embodiments, the insulating element 40 is made of plastic, specifically PP or PE. Of course, it is not limited to this.

[0050] Please see Figures 4 to 8 This utility model embodiment also discloses a top cover assembly for a power battery. The top cover assembly includes a top cover 10, a terminal post 20, a riveting block 30, and an insulating component 40 as described above. The top cover 10 forms a terminal post through hole 12 for the terminal post 20 to pass through. The upper end of the terminal post 20 extends out of the terminal post through hole 12 and is riveted to the riveting block 30. The riveting block 30 is insulatedly disposed on the top cover 10. The lower end of the terminal post 20 forms a terminal post base 21 located inside the top cover 10. The insulating component 40 is attached and fixed to the inner side of the top cover 10. The terminal post base 21 is installed in the mounting through hole 42 of the insulating component 40.

[0051] In this embodiment of the invention, the insulating member 40 of the top cover assembly uses the first protrusion 43 and the second protrusion 44 to press down on the current collector 70 at one end of the core 60 to limit the current collector 70 and the core 60. Compared with the relatively narrow protrusion ring pressing down, the first protrusion 43 and the second protrusion 44 can have a wider and larger contact area, thereby avoiding damage to the positive and negative electrode sheets of the core 60 based on the protrusion ring pressing down, which could lead to self-discharge problems / short circuit risks in the power battery, and also avoid deformation of the current collector 70, which could damage the internal structural compactness of the power battery and bring unpredictable risks.

[0052] Please see Figures 4 to 8This utility model embodiment also discloses a power battery, which includes a housing 50, a winding core 60, a current collector 70, and a top cover assembly as described above. The housing 50 is sleeved on the outside of the winding core 60. The current collector 70 includes a disc body 71 with full tabs welded to one end of the winding core 60 and an extension handle 72 extending to one side from the disc body 71. The extension handle 72 is placed in the receiving space 45. The end of the extension handle 72 away from the disc body 71 is welded to the terminal base 21. After flipping and closing the top cover assembly, the extension handle 72 is bent above the disc body 71. The first boss 43 and the second boss 44 are pressed onto the disc body 71 of the current collector 70.

[0053] In this embodiment of the invention, the insulating member 40 of the top cover assembly uses the first protrusion 43 and the second protrusion 44 to press down on the current collector 70 at one end of the core 60 to limit the current collector 70 and the core 60. Compared with the relatively narrow protrusion ring pressing down, the first protrusion 43 and the second protrusion 44 can have a wider and larger contact area, thereby avoiding damage to the positive and negative electrode sheets of the core 60 based on the protrusion ring pressing down, which could lead to self-discharge problems / short circuit risks in the power battery, and also avoid deformation of the current collector 70, which could damage the internal structural compactness of the power battery and bring unpredictable risks.

[0054] Specifically, the power battery is a cylindrical power battery, but it is not limited to this.

[0055] To facilitate understanding of this utility model, the assembly process of the power battery in the accompanying drawings is briefly described below:

[0056] (1) Assemble the top cover assembly, wherein the insulating part 40 is attached and fixed to the inner side of the top cover 10, and the pole base 21 is adapted to the mounting through hole 42 of the insulating part 40.

[0057] (2) Laser welding is performed to fix the disc body 71 of the collector plate 70 and the full-pole tab at one end of the core 60. This step is not in any particular order from step (1).

[0058] (3) Place the extension handle 72 of the collector plate 70 in the receiving space 45 between the first boss 43 and the second boss 44, and fix the end of the extension handle 72 to the pole base 21 by laser welding.

[0059] (4) Flip the top cover assembly and bend the extension handle 72 so that the top cover 10 covers the top opening of the housing 50, and the extension handle 72 is bent above the disk body 71. The first boss 43 and the second boss 44 are pressed onto the disk body 71 of the collector disk 70. In addition, the protruding edge 48 can insulate the bent extension handle 72 to prevent it from being fooled.

[0060] (5) When the power battery is inverted, the electrolyte flows into the corresponding boss. When the power battery is upright, the electrolyte in the boss can flow out from the seepage hole 46 and be absorbed by the positive / negative electrode of the core 60, thus avoiding the problem of liquid accumulation.

[0061] The above-disclosed examples are merely preferred embodiments of the present utility model, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. An insulating component for a power battery, said insulating component being attached to the inner side of the top cover of the power battery, characterized in that, The insulating component includes a base plate portion, a mounting through hole formed in the middle of the base plate portion, the mounting through hole being configured to mount an electrode post base, a first boss and a second boss protruding downward from opposite sides of the mounting through hole on the base plate portion, the first boss and the second boss being configured to be the disc body of a current collector at one end of a winding core, a receiving space being formed between the first boss and the second boss, the receiving space being used to receive an extension shank of the current collector that is welded to the electrode post base.

2. The insulating component for a power battery according to claim 1, characterized in that, The first protrusion is provided with a through hole for marking codes running vertically.

3. The insulating component for a power battery according to claim 1 or 2, characterized in that, The second protrusion is provided with an exhaust vent that extends vertically through the top and bottom, and the exhaust vent forms an exhaust port on the side facing the mounting hole.

4. The insulating component for a power battery according to claim 1, characterized in that, At least one of the first boss and the second boss is provided with a through-hole that extends vertically.

5. The insulating component for a power battery according to claim 4, characterized in that, The upper surface of the substrate has a groove formed at the position corresponding to the first boss and the second boss, the groove extends downward to the first boss or the second boss, and the leakage through hole communicates with the groove.

6. The insulating component for a power battery according to claim 1, characterized in that, The substrate portion extends downward on the other two opposite sides of the mounting through hole to form convex edges. The first boss, the second boss, and the convex edges on both sides together define the boundary of the receiving space. The convex edges are configured to insulate and prevent the bent extension handle from being fooled.

7. The insulating component for a power battery according to claim 6, characterized in that, The two ends of the convex edge are respectively connected to the outer edges of the first boss and the second boss; the outer surfaces of the convex edge, the first boss and the second boss are flush with the outer edge of the substrate.

8. The insulating component for a power battery according to claim 1, characterized in that, The upper surface of the substrate has two anti-rotation protrusions on opposite sides of the mounting through hole, and the anti-rotation protrusions are configured to fit into the anti-rotation groove on the inner side of the top cover.

9. A top cover assembly for a power battery, characterized in that, The top cover assembly includes a top cover, a pole post, a riveting block, and an insulating element as described in any one of claims 1 to 8. The top cover forms a pole post through hole for the pole post to pass through. The upper end of the pole post extends out of the pole post through hole and is riveted to the riveting block. The riveting block is insulatedly disposed on the top cover. The lower end of the pole post forms a pole post base located inside the top cover. The insulating element is attached and fixed to the inner side of the top cover. The pole post base is installed in the mounting through hole of the insulating element.

10. A power battery, characterized in that, The power battery includes a housing, a winding core, a current collector, and a top cover assembly as described in claim 9. The housing is sleeved on the outside of the winding core. The current collector includes a disc body with full tabs welded to one end of the winding core and an extension handle extending to one side from the disc body. The extension handle is placed in the receiving space. The end of the extension handle away from the disc body is welded to the terminal base. After flipping and closing the top cover assembly, the extension handle is bent above the disc body. The first boss and the second boss are pressed against the disc body of the current collector.

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