Battery and battery pack

Abstract

A battery, comprising a main body (1). A side surface of the main body (1) is provided with a riveting hole (101); the side surface of the main body (1) comprises a flat area (102) and a riveting area (103); the riveting hole (101) corresponds to the riveting area (103); in the width direction of the side surface of the main body (1), the distance between the hole edge of the riveting hole (101) and the edge of the side surface of the main body (1) is b, the width of the flat area (102) is T, the width of the riveting area (103) is T2, and equation (I) is satisfied, wherein 10≤y≤14, and y is a real number. By configuring the width of the riveting area (103) to be slightly smaller than the width of the flat area (102), when a pole assembly (2) is riveted in the riveting hole (101), the width of the riveting area (103) is increased and can be kept consistent with the width of the flat area (102), thereby improving the consistency of the width of the main body (1), ensuring the assembly effect of the main body (1) and other components, and improving the battery quality.

Description

Batteries and battery packs

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on February 4, 2024, with application number 2024101590156 and invention name “Battery and Battery Pack”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to batteries and battery packs. Background Art

[0004] As an important component of the battery, the outer shell body can isolate the internal and external environments and play a sealing role. It can also connect the internal and external circuits, and transmit the current of the internal electrode group of the battery to the outside through the pole, playing a guiding role. The battery usually includes a shell body, a pole group, a pole, an insulating part, and a seal. The pole is riveted to the rivet hole opened on the outer shell body through a rivet block. However, the riveting setting of the pole will cause the outer shell body to swell, thereby increasing the width of the outer shell body corresponding to the riveting position, resulting in poor width consistency of the outer shell body.

[0005] Summary of the Invention

[0006] In view of this, the present application provides a battery and a battery pack to solve the problem of poor consistency in the width of the shell body in the prior art.

[0007] In a first aspect, the present application provides a battery comprising: a main body, a rivet hole being opened on a side surface of the main body, the side surface of the main body comprising a flat plate area and a rivet area, the rivet hole being arranged corresponding to the rivet area; along the width direction of the side surface of the main body, the distance between the hole edge of the rivet hole and the edge of the side surface of the main body is b, the width of the flat plate area is T, and the width of the rivet area is T2, satisfying Where, 10≤y≤14, and y is a real number.

[0008] Beneficial effect: By setting the width of the main body corresponding to the riveting area to be slightly narrower than the width of the main body corresponding to the flat plate area, after the pole assembly is riveted into the rivet hole, the width of the main body corresponding to the riveting area is increased and can be consistent with the width of the flat plate area, thereby improving the consistency of the main body width, ensuring the assembly effect of the main body and other components, and improving the battery quality.

[0009] In an optional embodiment, a distance b between the edge of the rivet hole and the edge of the side surface of the main body is 2 mm to 10 mm.

[0010] Beneficial effect: while ensuring that the pole assembly can be stably installed on the main body, material waste is avoided.

[0011] In an optional embodiment, a mounting hole is opened on the side surface of the main body, and the side surface of the main body also includes a welding area, and the mounting hole is arranged corresponding to the welding area.

[0012] Beneficial effect: By setting the mounting hole for welding the explosion-proof valve, when gas is generated inside the battery and the internal pressure of the battery increases, the gas is exhausted through the explosion-proof valve to avoid battery explosion.

[0013] In an optional embodiment, the main body includes a cover plate or a shell, and the riveting holes are provided corresponding to the cover plate or the shell.

[0014] In an optional embodiment, the edge of the cover plate has a stepped structure.

[0015] Beneficial effect: The edge of the cover plate is set to be stepped, which facilitates the positioning and assembly of the cover plate and the opening of the shell.

[0016] In an optional embodiment, the width of the flat plate area T = (13 + B ± z) mm, wherein B ≥ 0, B is the minimum process increment of 13 mm of the width of the flat plate area, the unit of B is mm, 0.03 ≤ z ≤ 0.08, z is the tolerance of the width of the flat plate area, and the unit of z is mm.

[0017] In an optional embodiment, the battery further includes a pole assembly, and the pole assembly is riveted corresponding to the rivet hole.

[0018] In an optional embodiment, the battery further includes an explosion-proof valve, which is arranged corresponding to the mounting hole and welded to the main body.

[0019] In an optional embodiment, the battery further includes a pole group, and the pole group is disposed in the shell.

[0020] In a second aspect, the present application also provides a battery pack comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] FIG1 is a schematic diagram of the overall structure of a cover plate according to an embodiment of the present application;

[0023] FIG2 is a top view of the cover plate shown in FIG1 ;

[0024] FIG3 is a cross-sectional view taken along line AA in FIG2 ;

[0025] FIG4 is a cross-sectional view taken along line BB in FIG2 ;

[0026] FIG5 is a cross-sectional view taken along line CC in FIG2 ;

[0027] FIG6 is a schematic diagram of the overall structure of the cover plate, terminal assembly, and explosion-proof valve of the blade battery according to an embodiment of the present application;

[0028] FIG7 is a schematic diagram of the overall structure of the cover plate, the electrode assembly and the explosion-proof valve of the square shell battery according to an embodiment of the present application.

[0029] Explanation of the reference numerals: 1. Main body; 101. Riveting hole; 102. Flat plate area; 103. Riveting area; 104. Mounting hole; 105. Welding area; 106. Outer plate; 107. Inner plate; 2. Pole assembly; 3. Explosion-proof valve. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0031] The following describes an embodiment of the present application with reference to FIG. 1 to FIG. 7 .

[0032] According to an embodiment of the present application, on one hand, a battery is provided, comprising a main body 1. A rivet hole 101 is provided on the side of the main body 1. The side of the main body 1 comprises a flat plate area 102 and a rivet area 103. The rivet hole 101 is provided corresponding to the rivet area 103. Along the width direction of the side of the main body 1, the distance between the hole edge of the rivet hole 101 and the edge of the side of the main body 1 is b, the width of the flat plate area 102 is T, and the width of the rivet area 103 is T2, satisfying Where, 10≤y≤14, and y is a real number.

[0033] By setting the width of the main body 1 corresponding to the rivet area 103 to be slightly narrower than the width of the main body 1 corresponding to the flat plate area 102, after the pole assembly 2 is riveted into the rivet hole 101, the width of the main body 1 corresponding to the rivet area 103 is increased and can be consistent with the width of the flat plate area 102, thereby improving the consistency of the main body width, ensuring the assembly effect of the main body and other components, and improving the battery quality.

[0034] In one embodiment, the main body 1 includes a cover plate or a housing, and the rivet holes 101 are provided corresponding to the cover plate or the housing. Specifically, in this embodiment, as shown in Figures 1 to 7, the rivet holes 101 are provided corresponding to the cover plate. Therefore, by setting the width of the cover plate corresponding to the rivet area 103 to be slightly narrower than the width of the cover plate corresponding to the flat plate area 102, after the pole assembly 2 is riveted, the width of the cover plate corresponding to the rivet area 103 is increased, thereby improving the consistency of the cover plate width and further improving the assembly effect of the cover plate and the housing.

[0035] Of course, in other alternative embodiments, the rivet holes 101 may also be provided corresponding to the housing.

[0036] It is worth noting that the width T of the flat plate area 102 is the design width of the battery. Therefore, by setting the width of the side of the main body 1 corresponding to the riveted area 103 to T2, the width of the battery formed after the terminal assembly 2 is riveted to the main body 1 approaches the design width T. Specifically, in this embodiment, the width T of the flat plate area 102 is the design width of the cover plate.

[0037] It should be noted that in this embodiment, the width of the flat plate region 102 is T = (13 + B ± z) mm, where B ≥ 0, B is the minimum process increment of 13 mm for the width of the flat plate region 102, and the unit of B is mm. 0.03 ≤ z ≤ 0.08, z is the tolerance for the width of the flat plate region 102, and the unit of z is mm. That is, for blade batteries, the minimum process requirement for the cover plate width is 13 mm.

[0038] It is worth noting that, referring to Figure 2 , the rivet hole 101 is a circular hole, and the distance between one edge of the side surface of the main body 1 and the nearest edge of the rivet hole 101 is b. Specifically, in this embodiment, the distance between one edge of the cover plate and the nearest edge of the rivet hole 101 is b.

[0039] It should be noted that b is the design value of the distance between the edge of the rivet hole 101 and the edge of the cover plate.

[0040] It is worth noting that the width T2 of the riveting area 103 is set to 10≤y≤14, so that the pole assembly 2 is riveted in the riveting hole 101, causing the riveting area 103 to expand, and the width of the riveting area 103 is as close as possible to the width T of the flat plate area 102. When the pole assembly 2 is riveted on the cover plate to cause the riveted area 103 to expand, the width of the riveted area 103 will be greater than the width of the flat area 102, resulting in poor width consistency of the cover plate; When the pole assembly 2 is riveted on the cover plate to cause the riveted area 103 to expand, the width of the riveted area 103 will be smaller than the width of the flat plate area 102, which will also lead to poor width consistency of the cover plate.

[0041] In one embodiment, the distance b between the edge of the rivet hole 101 and the edge of the side of the main body 1 is 2 mm to 10 mm. That is, in this embodiment, the distance b between the edge of the rivet hole 101 and the edge of the cover plate is 2 mm to 10 mm.

[0042] It is worth noting that when the distance between the edge of the rivet hole 101 and the edge of the cover plate is too small, the strength of the rivet area 103 cannot meet the installation requirements of the pole assembly 2, affecting the overall quality of the battery; when the distance between the edge of the rivet hole 101 and the edge of the cover plate is too large, the width of the cover plate will increase, resulting in waste of material.

[0043] It should be noted that, when the value of b is smaller, the amount of material expansion of the cover plate corresponding to the riveting area 103 is greater after the pole assembly 2 is riveted. Therefore, a larger adjustment value needs to be set for T.

[0044] In one embodiment, as shown in Figures 1 and 2, a mounting hole 104 is provided on the side of the main body 1. The side of the main body 1 also includes a welding area 105, and the mounting hole 104 is arranged corresponding to the welding area 105. The mounting hole 104 is provided for welding the explosion-proof valve 3. When gas is generated inside the battery and the internal pressure of the battery increases, the explosion is discharged through the explosion-proof valve 3 to prevent battery explosion. Specifically, in this embodiment, the mounting hole 104 is provided on the cover plate.

[0045] In one embodiment, as shown in FIG. 2 to FIG. 5 , along the width direction of the side of the main body 1, the distance between the hole edge of the mounting hole 104 and the edge of the side of the main body 1 is a, and the width of the welding area 105 is T1, satisfying Where 8≤x≤12, and x is a real number.

[0046] By setting the width of the side of the main body 1 corresponding to the welding area 105 to be slightly wider than the width of the side of the main body 1 corresponding to the flat plate area 102, after the explosion-proof valve 3 is welded to the mounting hole 104, the width of the main body 1 corresponding to the welding area 105 is reduced and can be consistent with the width of the flat plate area 102, thereby improving the consistency of the width of the main body, ensuring the assembly effect of the main body and other components, and improving the quality of the battery.

[0047] It is worth noting that when the explosion-proof valve 3 is welded within the mounting hole 104, the cover plate cools and contracts, which can easily reduce the width of the weld zone 105, resulting in poor consistency in the width of the cover plate. Therefore, in this embodiment, the width of the cover plate corresponding to the weld zone 105 is set to be slightly wider than the design width of the cover plate. When the cover plate and explosion-proof valve 3 are assembled, the welding action of the explosion-proof valve 3 causes the width of the weld zone 105 to decrease, thereby maintaining a consistent width across the cover plate.

[0048] In one embodiment, the distance a between the edge of the mounting hole 104 and the edge of the side of the main body 1 is greater than 1.5 mm. Specifically, in this embodiment, the distance a between the edge of the mounting hole 104 and the edge of the cover is greater than 1.5 mm.

[0049] It should be further explained that a is the design value of the distance between the edge of the mounting hole 104 and the edge of the cover plate.

[0050] It is worth noting that when the distance between the edge of the mounting hole 104 and the edge of the cover plate is too small, the strength of the welding area 105 cannot meet the requirements for the installation of the explosion-proof valve 3, affecting the overall quality of the cover plate.

[0051] It should be noted that, when the value of a is smaller, the cover plate corresponding to the welding area 105 shrinks more after the explosion-proof valve 3 is welded. Therefore, a larger adjustment value needs to be set for T.

[0052] In one embodiment, as shown in Figures 3 to 5 , the edge of the cover plate has a stepped structure. Specifically, the cover plate includes an outer plate 106 and an inner plate 107. Along the thickness of the cover plate, the inner plate 107 is connected to the inner side of the outer plate 106. Along the circumference of the cover plate, the outer periphery of the outer plate 106 protrudes beyond the outer periphery of the inner plate 107, forming a stepped structure at the outer periphery of the cover plate. The stepped edge of the cover plate facilitates positioning and assembly of the cover plate with the opening of the housing.

[0053] It is worth noting that since the flat area 102, welding area 105 and riveted area 103 of the cover plate are set with different widths, the edge of the cover plate has an irregular structure (i.e., non-linear). When the cover plate is assembled with the explosion-proof valve 3 and the pole assembly 2, the edge of the cover plate approaches a linear shape due to the welding of the explosion-proof valve 3 and the riveting of the pole assembly 2.

[0054] It should be noted that, as shown in Figures 1 to 6, the cover plate of this embodiment can be the cover plate of a blade battery. Specifically, the cover plate is provided with a rivet hole 101 and a mounting hole 104. The rivet hole 101 is used to rivet the pole assembly 2 (positive or negative), and the mounting hole 104 is used to weld the explosion-proof valve 3. Alternatively, as shown in Figure 7, the cover plate of this embodiment can also be the cover plate of a square shell battery. The cover plate is provided with two rivet holes 101 and a mounting hole 104. The two rivet holes 101 are arranged at intervals, and the mounting hole 104 is located between the two rivet holes 101. The two rivet holes 101 are respectively used to rivet the two pole assemblies 2 (positive and negative), and the mounting hole 104 is used to weld the explosion-proof valve 3.

[0055] The following is a measurement of the width of different cover plates before and after riveting the pole assembly 2. The measurement results of the embodiment and the comparative example are shown in Tables 1 to 3. The cover plate of the embodiment refers to the width of the riveted area 103 according to the embodiment. Among them, 10≤y≤14, processing is performed; the cover plate of the comparative example means that the width of the riveted area 103 is processed according to the designed width T.

[0056] Table 1 Measurement results of Example 1 and Comparative Example 1

[0057] Table 2 Measurement results of Example 2 and Comparative Example 2

[0058] Table 3 Measurement results of Example 3 and Comparative Example 3

[0059] As can be seen from Table 1, in Example 1, T = 18 ± 0.05 mm, b = 2.5 mm, and the width T2 of the riveted area 103 is set in the range of 17.960 to 17.972 before the pole assembly 2 is riveted. After the pole assembly 2 is riveted, the width T2 of the riveted area 103 is increased, so that the values ​​of T2, T3, T4, and T5 tend to be consistent, so that the measured values ​​of the width of the cover plate at various locations after the pole assembly 2 is riveted are within the range of ± 0.01 mm, which means that the width consistency of the cover plate is good.

[0060] As can be seen from Table 2, in Example 2, T = 18 ± 0.05 mm, b = 3.5 mm, and the width T2 of the riveted area 103 is set in the range of 17.971 to 17.980 before the pole assembly 2 is riveted. After the pole assembly 2 is riveted, the width T2 of the riveted area 103 is increased, so that the values ​​of T2, T3, T4, and T5 tend to be consistent, so that the measured values ​​of the width of the cover plate at various locations after the pole assembly 2 is riveted are within the range of ± 0.01 mm, which means that the width consistency of the cover plate is good.

[0061] As can be seen from Table 3, in Example 3, T = 18 ± 0.05 mm, b = 5 mm, and the width T2 of the riveted area 103 is set in the range of 17.980 to 17.986 before the pole assembly 2 is riveted. After the pole assembly 2 is riveted, the width T2 of the riveted area 103 is increased, so that the values ​​of T2, T3, T4, and T5 tend to be consistent, so that the measured values ​​of the width of the cover plate at various locations after the pole assembly 2 is riveted are within the range of ± 0.01 mm, which means that the width consistency of the cover plate is good.

[0062] In Comparative Examples 1 to 3, before the pole assembly 2 is riveted, the width T2 of the riveted area 103 is consistent with the widths T3, T4, and T5 of the flat plate area 102. However, after the pole assembly 2 is riveted, the width T2 of the riveted area 103 increases, resulting in the measured width differences of the cover plate at various locations after the pole assembly 2 is riveted exceeding ±0.01 mm, which indicates that the width consistency of the cover plate is poor.

[0063] It is worth noting that, referring to FIG. 2 , in Tables 1 to 3, T3 , T4 , and T5 correspond to the widths of different positions of the flat plate region 102 , respectively.

[0064] It is worth noting that the value of b can be set according to actual design needs.

[0065] In one embodiment, as shown in FIG6 , the battery further includes a pole assembly 2 , which is riveted corresponding to the rivet hole 101 .

[0066] In one embodiment, as shown in FIG6 , the battery further includes an explosion-proof valve 3 , which corresponds to the mounting hole 104 and is welded to the cover plate.

[0067] In one embodiment, the battery further includes a pole group, which is disposed in the housing.

[0068] According to an embodiment of the present application, on the other hand, a battery pack is provided, comprising the above-mentioned battery.

[0069] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: The main body has a rivet hole on its side, and the side of the main body includes a flat plate area and a rivet area, and the rivet hole is arranged corresponding to the rivet area; along the width direction of the side of the main body, the distance between the hole edge of the rivet hole and the edge of the side of the main body is b, the width of the flat plate area is T, and the width of the rivet area is T2, satisfying Where, 10≤y≤14, and y is a real number.

2. The battery according to claim 1, characterized in that A distance b between the edge of the rivet hole and the edge of the side surface of the main body is 2 mm to 10 mm.

3. The battery according to claim 1 or 2, characterized in that A mounting hole is provided on the side surface of the main body. The side surface of the main body also includes a welding area. The mounting hole is provided corresponding to the welding area.

4. The battery according to claim 1 or 2, characterized in that The main body includes a cover plate or a shell, and the riveting holes are arranged corresponding to the cover plate or the shell.

5. The battery according to claim 4, characterized in that The edge of the cover plate is in a stepped structure.

6. The battery according to claim 1 or 2, characterized in that The width of the flat plate area T = (13 + B ± z) mm, where B ≥ 0, B is the minimum process increment of 13 mm of the width of the flat plate area, the unit of B is mm, 0.03 ≤ z ≤ 0.08, z is the tolerance of the width of the flat plate area, and the unit of z is mm.

7. The battery according to claim 1 or 2, characterized in that The battery further includes a pole assembly, which is riveted corresponding to the riveting hole.

8. The battery according to claim 3, characterized in that The battery further includes an explosion-proof valve, which is arranged corresponding to the mounting hole and is welded to the main body.

9. The battery according to claim 4, characterized in that The battery further includes a pole group, which is disposed in the shell.

10. A battery pack, characterized in that: A battery comprising the battery according to any one of claims 1 to 9.

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