Battery

Abstract

The utility model provides a battery which comprises a shell, a current collecting disc and an insulating spacer, and the current collecting disc is arranged in the shell; along the axial direction of the battery, the insulating spacer is connected between the current collecting plate and the shell, and a groove is formed in one side, facing the current collecting plate, of the insulating spacer; the volume of the groove is M21, the maximum thickness of the insulating spacer is M22, the area of the insulating spacer is M23, and M21 is larger than or equal to 10% * M22 * M23; due to the arrangement of the groove, an air chamber space can be reserved in the shell, so that an expansion space can be reserved for the roll core in the shell, and the use safety of the battery is ensured; meanwhile, the internal pressure of the shell can be reduced, so that the use safety of the battery is ensured; besides, on the premise that the original size of the shell is not influenced, a part of internal space of the shell is reserved, so that the shell is prevented from being completely filled with entities, the safety of the battery is further ensured, the overall weight of the battery is reduced, and the lightweight design requirement of the battery is met.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a battery. Background Technology

[0002] In related technologies, batteries are typically composed of a casing, a winding core, a current collector, and terminals. During assembly, to ensure insulation between the current collector and the casing, an insulating gasket is often placed between them. Filling the gasket reduces the air chamber space inside the casing. When the winding core expands, insufficient internal space can easily cause the casing to expand, leading to the expansion of the entire battery pack and posing a safety hazard. On the other hand, directly increasing the volume of the casing would increase the weight of the battery, failing to meet the requirements for lightweight battery use. Utility Model Content

[0003] The present invention provides a battery that can improve the technical problem that insufficient internal space of the battery can easily lead to casing expansion, which poses a problem of electrical safety.

[0004] An embodiment of this utility model provides a battery, comprising:

[0005] case;

[0006] A collector plate is disposed within the housing;

[0007] An insulating pad is provided along the axial direction of the battery, connecting the current collector and the housing, and the insulating pad has a groove on the side facing the current collector.

[0008] Wherein, the volume of the groove is M. 21 The maximum thickness of the insulating pad is M. 22 The bottom area of ​​the insulating pad is M. 23 M 21 ≥10%×M 22 ×M 23 .

[0009] In one embodiment, the depth of the groove is M. 24 The distance M between the bottom wall of the groove and the side of the insulating pad facing away from the collector plate. 25 , of which M 25 =M 22 -M 24 0.3mm≤M 25 ≤80%M 22 .

[0010] In one embodiment, the insulating pad has an inner reinforcing rib and an outer reinforcing rib on the side facing the collector, the inner reinforcing rib and the outer reinforcing rib are spaced apart, and the groove is located between the inner reinforcing rib and the outer reinforcing rib.

[0011] In one embodiment, the inner reinforcing rib and the outer reinforcing rib are connected by a connecting reinforcing rib.

[0012] In one embodiment, the connecting reinforcing ribs are provided in a plurality of positions, and the plurality of connecting reinforcing ribs are arranged at intervals along the circumference of the insulating gasket, and are capable of dividing the groove into a plurality of sections.

[0013] In one embodiment, the outer reinforcing rib is sleeved around the outer periphery of the inner reinforcing rib, and the distance between the inner and outer reinforcing ribs is M. 26 The maximum outer diameter of the insulating pad is M. 27 30% M 27 ≤M 26 ≤70%M 27 .

[0014] In one embodiment, the thickness of the inner reinforcing rib, the outer reinforcing rib, and the connecting reinforcing rib is M along the axial direction of the insulating gasket. 28 , of which M 22 ≥M 28 ≥0.5M 25 .

[0015] In one embodiment, the circumferential outer edge of the insulating pad has a transition slope that gradually slopes from the side away from the manifold towards the side closer to the manifold and towards the housing.

[0016] In one embodiment, along the axial direction of the insulating pad, the outer surface of the transition slope is formed into an arc shape, and the radius of the transition slope is M. 26 M 22 ≥M 26 ≥0.5M 22 .

[0017] In one embodiment, the height of the transition slope along the axial direction of the insulating pad is M. 27 M 22 ≥M 27 ≥0.5M 22 The width of the transition slope is M. 28 ,4mm≥M 28 ≥0.3mm.

[0018] In one embodiment, the outer periphery of the insulating pad is provided with a notch.

[0019] In one embodiment, the notches are provided in a plurality of them, and the plurality of notches are arranged at intervals along the circumference of the insulating pad.

[0020] In one embodiment, along the axial direction of the insulating pad, the arc length of the notch gradually increases from the side away from the manifold toward the side closer to the manifold.

[0021] In one embodiment, the arc length of the notch near the collector plate is M. 29 , 0.1mm≤M 29 ≤10mm.

[0022] In one embodiment, a winding core is further included, the winding core being located on the side of the insulating pad near the current collector, the diameter of the winding core being M. 30 The inner diameter of the shell is M. 31 The maximum diameter of the insulating pad is M. 32 M 30 <M 32 <M 31 .

[0023] In one embodiment, an opening is provided on one side of the housing, and a through hole is provided on the insulating gasket, with the opening and the through hole being opposite each other.

[0024] In one embodiment, the diameter of the through hole is M. 33 Along the radial direction of the housing, the diameter of the opening is M. 34 M 33 ≥M 34 .

[0025] The beneficial effects of the embodiments of this utility model are as follows:

[0026] Because the insulating gasket is installed between the current collector and the housing, and the insulating gasket has a groove on the side facing the current collector, the groove allows for the reservation of a gas chamber space inside the housing. This provides expansion space for the core inside the housing, ensuring battery safety. Simultaneously, the volume of the reserved groove is no less than 10% of the volume occupied by the insulating gasket. According to the ideal gas law, PV = NRT, reserving a certain volume inside the housing reduces internal pressure, thus ensuring battery safety. Furthermore, the groove on the insulating gasket allows for the reservation of some internal space without affecting the original volume of the housing, preventing the entire interior of the housing from being filled with solid material, further ensuring battery safety, and reducing the overall weight of the battery, meeting the requirements for lightweight battery design. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional view of a battery provided in an embodiment of this utility model;

[0029] Figure 2 This is a three-dimensional schematic diagram of the insulating pad provided in an embodiment of this utility model;

[0030] Figure 3 This is a top view of the insulating gasket provided in an embodiment of this utility model;

[0031] Figure 4 This is a cross-sectional view of the insulating gasket provided in an embodiment of this utility model;

[0032] Figure 5 It is at Figure 2 A magnified view of a section at point A.

[0033] Figure Labels

[0034] 1. Battery;

[0035] 11. Shell; 113. Opening;

[0036] 35. Collector disk;

[0037] 50. Insulating gasket; 501. Groove; 502. Inner ring reinforcing rib; 503. Outer ring reinforcing rib; 504. Connecting reinforcing rib; 505. Transition slope; 506. Notch; 507. Through hole. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0039] Reference Figures 1 to 3 As shown, this application provides a battery 1, including a housing 11, a current collector 35, and an insulating pad 50;

[0040] The collector plate 35 is disposed inside the housing 11;

[0041] Along the axial direction of the battery 1, the insulating gasket 50 connects the current collector 35 and the housing 11, and the insulating gasket 50 has a groove 501 on the side facing the current collector 35. The volume of the groove 501 is M. 21 The maximum thickness of the insulating pad 50 is M. 22 The bottom area of ​​the insulating pad 50 is M. 23 M 21 ≥10%×M 22 ×M 23 .

[0042] Since the insulating gasket 50 is installed between the current collector 35 and the housing 11, and the insulating gasket 50 has a groove 501 on the side facing the current collector 35, the groove 501 allows for the reservation of a gas chamber space inside the housing 11, thus providing expansion space for the core inside the housing 11 and ensuring the safety of the battery 1. Simultaneously, the volume of the reserved groove 501 is not less than 10% of the volume of the space occupied by the insulating gasket 50. According to the ideal gas law, PV = NRT, reserving a certain volume inside the housing 11 reduces the internal pressure of the housing 11, thereby ensuring the safety of the battery 1. Furthermore, the groove 501 on the insulating gasket 50 allows for the reservation of a portion of the internal space of the housing 11 without affecting its original volume, preventing the entire interior of the housing 11 from being filled with solid material, further ensuring the safety of the battery 1, and reducing the overall weight of the battery 1, thus meeting the lightweight design requirements of the battery 1.

[0043] It is understandable that the ideal gas law is PV = NRT, where P is the pressure (Pa) and V is the gas volume (m³). 3 T is the temperature (K), n is the amount of substance of the gas (mol), and R is the molar gas constant (also called the universal gas constant) (J / (mol·K)). It can be seen that the gas volume V is inversely proportional to the pressure P. When the gas volume V is larger, the pressure P is smaller. Therefore, setting the groove 501 on the insulating gasket 50 can increase the gas volume space inside the shell 11, that is, it can reduce the pressure inside the shell 11, thereby ensuring the safety of the battery 1.

[0044] It should also be noted that, during the specific assembly process, in order to further ensure the insulation effect between the collector plate 35 and the inner side wall of the housing 11, adhesive can be applied between the collector plate 35 and the housing 11 to cooperate with the insulating gasket 50 and ensure the insulation between the collector plate 35 and the housing 11.

[0045] In some embodiments, the depth of the groove 501 is M. 24 The distance M between the bottom wall of the groove 501 and the side of the insulating pad 50 away from the collector plate 35 is... 25 , of which M 25 =M 22 -M 24 0.3mm≤M 25 ≤80%M 22 In this embodiment, the distance between the bottom wall of the groove 501 and the side of the insulating pad 50 away from the current collector 35 is the remaining thickness of the insulating pad 50 after the groove 501 is removed. The remaining thickness of the insulating pad 50 after the groove 501 is removed is not less than 0.3mm, but not more than 80% of the overall thickness of the insulating pad 50. This ensures that the depth of the groove 501 is sufficient and also ensures the strength of the insulating pad 50, preventing the insulating pad 50 from breaking during assembly or use due to insufficient remaining thickness, thus ensuring the normal use of the battery 1.

[0046] In some embodiments, refer to Figure 3 and Figure 4 As shown, the insulating gasket 50 has an inner reinforcing rib 502 and an outer reinforcing rib 503 on the side facing the collector plate 35. The inner reinforcing rib 502 and the outer reinforcing rib 503 are spaced apart, and the groove 501 is located between the inner reinforcing rib 502 and the outer reinforcing rib 503. The inner reinforcing rib 502 and the outer reinforcing rib 503 prevent a decrease in the overall strength of the insulating gasket 50 due to the groove 501, thus ensuring the overall strength of the insulating gasket 50 and its normal use.

[0047] In some embodiments, to further ensure the strength of the insulating pad 50, the inner ring reinforcing rib 502 and the outer ring reinforcing rib 503 are connected by a connecting reinforcing rib 504.

[0048] In some embodiments, refer to Figure 3 and Figure 4As shown, multiple connecting reinforcing ribs 504 are provided, and these multiple connecting reinforcing ribs 504 are arranged at intervals along the circumference of the insulating gasket 50, and can divide the groove 501 into multiple parts. This ensures uniform strength across all parts of the insulating gasket 50, and the connecting reinforcing ribs 504 connect the inner ring reinforcing ribs 502 and the outer ring reinforcing ribs 503, thereby improving the strength of the inner ring reinforcing ribs 502 and the outer ring reinforcing ribs 503, and thus guaranteeing the strength of the insulating gasket 50.

[0049] It is understood that in this embodiment, there are eight connecting reinforcing ribs 504, and the eight connecting reinforcing ribs 504 are arranged at uniform intervals along the circumference of the insulating pad 50; and, in order to ensure the connection strength between the inner ring reinforcing rib 502 and the outer ring reinforcing rib 503, the number of connecting reinforcing ribs 504 should be set to not less than four in the specific configuration.

[0050] In some embodiments, refer to Figure 3 and Figure 4 As shown, the outer reinforcing rib 503 is sleeved around the outer periphery of the inner reinforcing rib 502, and the distance between the inner reinforcing rib 502 and the outer reinforcing rib 503 is M. 26 The maximum outer diameter of the insulating pad 50 is M. 27 30% M 27 ≤M 26 ≤70% M 27 This ensures that the distance between the inner reinforcing rib 502 and the outer reinforcing rib 503 is appropriate, avoiding any impact on the reinforcing effect due to an excessively large gap between them.

[0051] In some embodiments, along the axial direction of the insulating gasket 50, the thickness of the inner ring reinforcing rib 502, the outer ring reinforcing rib 503, and the connecting reinforcing rib 504 is all M. 28 , of which M 22 ≥M 28 ≥0.5M 25 In this embodiment, the thickness of the inner reinforcing rib 502, the outer reinforcing rib 503, and the connecting reinforcing rib 504 is not less than half of the remaining thickness of the insulating gasket 50 after removing the groove 501. This ensures that the thickness of the inner reinforcing rib 502, the outer reinforcing rib 503, and the connecting reinforcing rib 504 is sufficient to achieve a reinforcing effect, thereby ensuring the normal use of the insulating gasket 50.

[0052] In some embodiments, refer to Figure 5As shown, the insulating gasket 50 has a transition slope 505 along its circumferential outer edge, which gradually slopes from the side away from the current collector 35 toward the side closer to the current collector 35 and toward the housing 11. During battery assembly, to ensure insulation, the diameter of the insulating gasket 50 is usually only slightly different from the inner diameter of the inner sidewall of the housing 11. Therefore, by providing a transition slope 505 on the outer periphery of the insulating gasket 50—that is, by providing a chamfer on the outer periphery of the insulating gasket 50—the assembly process of the insulating gasket 50 and the housing 11 can be smoothly achieved, facilitating installation.

[0053] In some embodiments, refer to Figure 1 As shown, along the axial direction of the insulating pad 50, the outer surface of the transition slope 505 is set in an arc shape, and the radius of the transition slope 505 is M. 26 M 22 ≥M 26 ≥0.5M 22 The outer periphery of the insulating gasket 50 is rounded, which not only facilitates the assembly of the insulating gasket 50 into the housing 11, but also, through the setting of the above parameters, avoids the radius of the rounded corner being too large, thereby preventing the gap between the outer circumferential edge of the insulating gasket 50 and the housing 11 from being too large, and ensuring that the insulating gasket 50 can play an insulating role.

[0054] In some embodiments, the height of the transition slope 505 along the axial direction of the insulating pad 50 is M. 27 M 22 ≥M 27 ≥0.5M 22 The width of the transition slope 505 is M. 28 ,4mm≥M 28 ≥0.3mm. That is, the outer periphery of the insulating gasket 50 is provided with a chamfered C-angle, which not only facilitates the assembly of the insulating gasket 50 into the housing 11, but also, through the setting of the above parameters, can avoid the size of the chamfered C-angle being too large, thereby preventing the gap between the outer periphery of the insulating gasket 50 and the housing 11 from being too large, and ensuring that the insulating gasket 50 can play an insulating role.

[0055] In some embodiments, refer to Figure 5 As shown, the insulating gasket 50 has a notch 506 on its outer periphery. By providing the notch 506, when the insulating gasket is assembled into the housing 11, the notch 506 can provide a certain deformation space for the insulating gasket 50, thereby facilitating the assembly of the insulating gasket 50 and preventing the insulating gasket 50 from breaking during assembly.

[0056] In some embodiments, multiple notches 506 are provided, and the multiple notches 506 are arranged at intervals along the circumference of the insulating pad 50. In this embodiment, four notches 506 are provided, and the four notches 506 are arranged at uniform intervals to better ensure the installation effect.

[0057] In some embodiments, along the axial direction of the insulating gasket 50, the arc length of the notch 506 gradually increases from the side away from the manifold 35 toward the side closer to the manifold 35. That is, in this embodiment, along the axial direction of the insulating gasket 50, the width of one side of the notch 506 is smaller than the width of the other side of the notch 506, which not only facilitates the assembly of the insulating gasket 50 but also facilitates the injection molding and demolding process of the insulating gasket 50.

[0058] It should also be noted that, in this embodiment, the arc length of the side of the notch 506 away from the collector plate 35 is smaller than the arc length of the side closer to the collector plate 35, which ensures that the notch 506 can provide deformation space for the insulating gasket 50, making it convenient for the insulating gasket 50 to be assembled into the shell.

[0059] In some embodiments, the arc length of the notch 506 on the side near the collector plate 35 is M. 29 , 0.1mm≤M 29 ≤10mm. By setting the above parameters, sufficient deformation space can be ensured, while avoiding the insulation effect being affected by an excessively large 506 notch.

[0060] In some embodiments, a winding core is also included, located on the side of the insulating pad 50 near the current collector, the diameter of the winding core being M. 30 The inner diameter of the housing 11 is M. 31 The maximum diameter of the insulating pad 50 is M. 32 M 30 <M 32 <M 31 In this embodiment, the diameter of the insulating gasket 50 is set between the diameter of the winding core and the inner diameter of the housing 11. This ensures that the insulating gasket 50 can provide insulation between the collector plate 35 and the housing 11, and also facilitates the assembly of the insulating gasket 50 into the housing 11.

[0061] In some embodiments, for ease of assembly, an opening 113 is provided on one side of the housing 11, and a through hole 507 is provided on the insulating gasket 50, with the opening 113 and the through hole 507 being opposite each other.

[0062] In some embodiments, the diameter of the through hole 507 is M. 33 Along the radial direction of the housing 11, the diameter of the opening 113 is M.34 M 33 ≥M 34 In the specific assembly process, after the collector plate 35 is connected to the terminal, the insulating gasket 50 is used to achieve insulation between the collector plate 35 and the housing 11. At the same time, in order to ensure the insulation effect, a plastic part is also provided between the housing 11 and the insulating gasket 50. Therefore, the diameter of the through hole 507 is smaller than the diameter of the opening, which can provide assembly space for the plastic part to further ensure the insulation effect.

[0063] It should also be noted that, in this embodiment, the minimum distance between the inner ring reinforcing rib 502 and the through hole 507 is between 0.5mm and 6mm, which facilitates injection molding and avoids the distance between the inner ring reinforcing rib 502 and the through hole 507 being too small, thus ensuring the reinforcing effect.

[0064] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery, characterized in that, include: case; A collector plate is disposed within the housing; An insulating pad is provided along the axial direction of the battery, connecting the current collector and the housing, and the insulating pad has a groove on the side facing the current collector. Wherein, the volume of the groove is M. 21 The maximum thickness of the insulating pad is M. 22 The bottom area of ​​the insulating pad is M. 23 M 21 ≥10%×M 22 ×M 23 .

2. The battery according to claim 1, characterized in that, The depth of the groove is M. 24 The distance M between the bottom wall of the groove and the side of the insulating pad facing away from the collector plate. 25 , of which M 25 =M 22 -M 24 0.3mm≤M 25 ≤80%M 22 .

3. A battery according to any one of claims 1-2, characterized in that, The insulating pad has an inner reinforcing rib and an outer reinforcing rib on the side facing the collector plate. The inner reinforcing rib and the outer reinforcing rib are spaced apart, and the groove is located between the inner reinforcing rib and the outer reinforcing rib.

4. A battery according to claim 3, characterized in that, The inner reinforcing rib and the outer reinforcing rib are connected by a connecting reinforcing rib.

5. A battery according to claim 4, characterized in that, The connecting reinforcing ribs are provided in multiples, and the multiple connecting reinforcing ribs are arranged at intervals along the circumference of the insulating gasket, and can divide the groove into multiple parts.

6. A battery according to claim 4, characterized in that, The outer reinforcing rib is sleeved around the outer periphery of the inner reinforcing rib, and the distance between the inner and outer reinforcing ribs is M. 26 The maximum outer diameter of the insulating pad is M. 27 30% M 27 ≤M 26 ≤70%M 27 .

7. A battery according to claim 4, characterized in that, Along the axial direction of the insulating gasket, the thickness of the inner reinforcing rib, the outer reinforcing rib, and the connecting reinforcing rib is all M. 28 , of which M 22 ≥M 28 ≥0.5M 25 .

8. A battery according to claim 1, characterized in that, The outer circumferential edge of the insulating pad has a transition slope that gradually slopes from the side away from the manifold towards the side closer to the manifold and towards the housing.

9. A battery according to claim 8, characterized in that, Along the axial direction of the insulating pad, the outer surface of the transition slope is rounded, and the radius of the transition slope is M. 26 M 22 ≥M 26 ≥0.5M 22 .

10. A battery according to claim 8, characterized in that, Along the axial direction of the insulating pad, the height of the transition slope is M. 27 M 22 ≥M 27 ≥0.5M 22 The width of the transition slope is M. 28 ,4mm≥M 28 ≥0.3mm.

11. A battery according to claim 1, characterized in that, The insulating pad has a notch on its outer periphery.

12. A battery according to claim 11, characterized in that, The notches are provided in multiples, and the multiple notches are arranged at intervals along the circumference of the insulating pad.

13. A battery according to claim 11, characterized in that, Along the axial direction of the insulating pad, the arc length of the notch gradually increases from the side away from the collector plate toward the side closer to the collector plate.

14. A battery according to claim 13, characterized in that, The arc length of the notch near the collector plate is M. 29 , 0.1mm≤M 29 ≤10mm.

15. A battery according to claim 1, characterized in that, It also includes a core, which is located on the side of the insulating pad near the current collector, and the diameter of the core is M. 30 The inner diameter of the shell is M. 31 The maximum diameter of the insulating pad is M. 32 M 30 <M 32 <M 31 .

16. A battery according to claim 1, characterized in that, The housing has an opening on one side, and the insulating gasket has a through hole, with the opening and the through hole being opposite each other.

17. A battery according to claim 16, characterized in that, The diameter of the through hole is M. 33 Along the radial direction of the housing, the diameter of the opening is M. 34 M 33 ≥M 34 .

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