Battery monomer, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, and particularly provides a battery monomer, a battery and electric equipment, the battery monomer comprises a shell, an electrode terminal, an electrode assembly and a current collecting component, the shell comprises a top wall and a side wall which are connected, the top wall is provided with a first through hole, the electrode terminal is installed in the first through hole, and the side wall is provided with a second through hole. The electrode assembly is arranged in the shell, the electrode assembly is provided with a first tab, and the current collecting component is arranged between the top wall and the first tab; the electrode assembly comprises an electrode terminal, the electrode terminal is provided with a first groove, the battery monomer further comprises a sealing plate, the sealing plate is arranged at an opening of the first groove and is electrically connected with the electrode terminal, the electrode terminal comprises a first surface opposite to the electrode assembly, the sealing plate comprises a second surface opposite to the electrode assembly, and the sealing plate is electrically connected with the sealing plate. And the height difference between the first surface and the second surface is 0-0.2 mm, so that the problem of pseudo soldering during welding of the chip and the electrode terminal is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and specifically provides a battery monomer, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] Currently, there are two ways to weld the cylindrical battery pole and the positive collector plate. The first solution is to use ultrasonic torque welding, that is, the positive collector plate and the pole are welded together through an ultrasonic torque process. This welding requires inserting a welding needle into the core hole. This solution is easy to scratch the diaphragm during the insertion process, resulting in insertion failure and inability to weld. When the insertion is successful, the welding needle will generate a lot of metal chips during the welding process, thereby increasing the risk of internal short circuit in the battery cell, increasing battery self-discharge, and affecting the battery life. In addition, the welding needle has a limited life and high cost. The second solution is to groove the upper surface of the pole, and the laser penetrates the pole to weld to the positive collector plate. This solution increases the BOM cost of the battery cell, and the grooves affect the welding of the battery pack tabs, which in turn affects the overall performance of the battery.

[0004] Accordingly, the art requires a new battery cell, battery and electrical equipment to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the above technical problem, that is, to solve the problem of cold welding when welding the bar piece and the electrode terminal.

[0006] In a first aspect, the utility model provides a battery cell, comprising a shell, an electrode terminal, an electrode assembly and a current collecting member, the shell comprising a connected top wall and side walls, the top wall being provided with a first through hole, the electrode terminal being installed in the first through hole, the electrode assembly being arranged in the shell, the electrode assembly being provided with a first pole ear, the current collecting member being arranged between the top wall and the first pole ear and electrically connecting the electrode terminal and the first pole ear; wherein, the electrode terminal is provided with a first groove, the battery cell further comprising a sealing plate, the sealing plate being arranged at the opening of the first groove and being electrically connected to the electrode terminal, the electrode terminal comprising a first surface facing away from the electrode assembly, the sealing plate comprising a second surface facing away from the electrode assembly, and the height difference between the first surface and the second surface is 0mm-0.2mm.

[0007] In the case of adopting the above technical solution, by providing a first groove on the electrode terminal, the laser can penetrate the electrode terminal and weld with the current collecting member, and the sealing plate used to close the opening is provided on the first groove, so that the welding of the bar piece can be better realized, the overcurrent capacity can be met, and the structural strength of the electrode terminal can be increased. Because when the bar piece is welded with the electrode terminal, the electrode terminal and the sealing plate both have a height tolerance. When the sealing plate is an upper tolerance and the electrode terminal is a lower tolerance, the sealing plate will be higher than the electrode terminal. At this time, it is necessary to control the height of the electrode terminal and the sealing plate, that is, to control the height difference between the first surface of the electrode terminal and the second surface of the sealing plate to be less than or equal to 0.2mm. In this way, when the electrode terminal and the sealing plate are welded, the sealing plate will not exceed the first surface too much or the electrode terminal exceeds the sealing plate too much, which will cause a cold weld when the bar piece is welded with the electrode terminal, thereby affecting the welding stability.

[0008] In a preferred technical solution of the above battery case, the electrode terminal and the sealing plate are spaced apart in a horizontal projection.

[0009] In the preferred technical solution of the above battery case, the electrode terminal and the sealing plate are two independent components, and the electrode terminal and the sealing plate are sealed by welding. After welding, there is a weld mark between the electrode terminal and the sealing plate.

[0010] When the above technical solution is adopted, a second groove is provided at the connection between the electrode terminal and the sealing plate.

[0011] In the preferred technical solution of the above-mentioned battery shell, a recessed second groove is provided on the electrode terminal and / or the sealing plate, so that the solder during welding can be filled in the second groove without increasing the height of the welding area during welding, thereby affecting the welding stability between the tab and the electrode terminal.

[0012] When the above technical solution is adopted, a welding zone is provided between the sealing plate and the electrode terminal, and a height difference between the highest point of the welding zone and the first surface and / or the second surface is 0 mm-0.2 mm.

[0013] In the preferred technical solution of the above-mentioned battery shell, after the sealing plate is welded to the electrode terminal, the setting of the second groove lowers the height of the welding zone, ensuring that the height difference between the highest point of the welding zone and the first surface and the second surface is less than or equal to 0.2 mm, which can ensure that when welding the bar sheet, the electrode terminal and the sealing plate have good flatness, and the high height difference between the sealing plate and the electrode terminal will not cause the bar sheet and the electrode terminal to be unable to be welded or a cold weld will occur, thereby affecting the welding of the bar sheet and affecting the stability of the welding.

[0014] When the above technical solution is adopted, the first surface is higher than the second surface, and the highest point of the welding zone is not higher than the first surface; or, the second surface is higher than the first surface, and the highest point of the welding zone is not higher than the second surface.

[0015] In the preferred technical solution of the above-mentioned battery shell, the height of the sealing plate is lower than the electrode terminal, and the height of the solder in the welding zone is lower than the electrode terminal, or the height of the electrode terminal is lower than the sealing plate, and the height of the solder in the welding zone is lower than the sealing plate. In this way, the solder will not be higher than the electrode terminal or the sealing plate, which can ensure that the welding of the tab and the electrode terminal will not fail or a cold weld will occur.

[0016] When the above technical solution is adopted, the width of the second groove is 0.3mm-1.5mm; or, the depth of the second groove is 0.3mm-1mm; or, the thickness of the sealing plate is 0.5mm-1.5mm; or, the thickness of the electrode terminal is 3mm-4mm.

[0017] In the preferred technical scheme of the above-mentioned battery shell, the width of the second groove is 0.3mm-1.5mm, which can meet the weld line width of laser welding; the depth of the second groove is 0.3mm-1mm, which can meet the weld line height of laser welding, and the thickness of the sealing plate is 0.5mm-1.5mm. If the thickness of the sealing plate is too thin, the strength of the sealing plate will be insufficient, and the strength of the electrode terminal will not be enhanced. If the thickness is too thick, the inner diameter of the groove of the electrode terminal will be increased, and the strength of the electrode terminal itself will be reduced; the thickness of the electrode terminal is 3mm-4mm. If the electrode terminal is too thin, the air pressure resistance will be reduced, that is, it will break from the groove under a certain air pressure, and if it is too thick, it will be difficult for the laser to penetrate. Excessive laser energy will soften the plastic between the electrode terminal and the shell, causing the overall structure to deform.

[0018] When the above technical solution is adopted, the height difference between the first surface and the second surface is 0.02 mm-0.1 mm, and / or the diameter of the sealing plate is 3 mm-20 mm.

[0019] In the preferred technical solution of the above-mentioned battery shell, the height difference between the first surface and the second surface is 0.02mm-0.1mm, so that after the electrode terminal and the sealing plate are welded, the thickness of the electrode terminal and the sealing plate is extremely small and close to flat, and the welding of the tabs will not be impossible or the welding will not be cold due to the protrusion of one of the electrode terminal and the sealing plate, which will affect the welding stability.

[0020] In the case of adopting the above technical solution, the side wall of the first groove is provided with a step portion, the sealing plate is arranged on the step portion, and the bottom of the first groove is provided with a connecting portion, and the connecting portion is electrically connected to the current collecting member.

[0021] In the preferred technical solution of the above-mentioned battery shell, the step portion provided can support the sealing plate when the sealing plate is installed in the first groove without affecting the overall strength of the electrode terminal, and the connecting portion provided at the bottom of the first groove can be conveniently welded with the current collecting member.

[0022] In a second aspect, the utility model provides a battery, comprising the battery cell described in the first aspect.

[0023] In a third aspect, the utility model provides an electrical device, comprising the battery described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0025] Figure 1 It is a schematic cross-sectional structural diagram of a battery cell of the utility model;

[0026] Figure 2 It is a partial cross-sectional schematic diagram of a battery cell with a welding area of ​​the utility model;

[0027] Figure 3 It is a partial cross-sectional schematic diagram of an embodiment of the utility model;

[0028] Figure 4 It is a partial cross-sectional schematic diagram of another embodiment of the utility model.

[0029] List of reference numerals:

[0030] 1. Shell; 11. Top wall; 12. Side wall; 13. First through hole; 2. Electrode terminal; 21. First groove; 22. First surface; 23. Step portion; 24. Connecting portion; 3. Electrode assembly; 31. First pole ear; 32. Second pole ear; 4. Current collecting member; 5. Sealing plate; 51. Second surface; 6. Second groove; 7. Welding area; 8. Cover plate. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principle of the battery case of the present invention and are not intended to limit the protection scope of the present invention.

[0032] It should be noted that, in the description of the present invention, the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] See first Figure 1-2 In the first aspect, the utility model provides a battery cell, including a shell 1, an electrode terminal 2, an electrode assembly 3 and a current collecting member 4, the shell 1 includes a connected top wall 11 and a side wall 12, the top wall 11 is provided with a first through hole 13, the electrode terminal 2 is installed in the first through hole 13, the electrode assembly 3 is arranged in the shell 1, and the end of the electrode assembly 3 facing the electrode terminal 2 is provided with a first pole ear 31, the current collecting member 4 is arranged between the top wall 11 and the first pole ear 31 and electrically connects the electrode terminal 2 and the first pole ear 31; wherein, the electrode terminal 2 is provided with a first groove 21, the battery cell also includes a sealing plate 5, the sealing plate 5 is arranged at the opening of the first groove 21 and is electrically connected to the electrode terminal 2, the electrode terminal 2 includes a first surface 22 facing away from the electrode assembly 3, the sealing plate 5 includes a second surface 51 facing away from the electrode assembly 3, and the height difference between the first surface 22 and the second surface 51 is 0mm-0.2mm.

[0035] The battery cell of the utility model is provided with a first groove 21 on the electrode terminal 2, so that the laser can penetrate the electrode terminal 2 and weld with the current collecting member 4. The sealing plate 5 used to close the opening is provided on the first groove 21, so that the welding of the bar piece can be better realized, the current capacity can be met, and the structural strength of the electrode terminal 2 can be increased. Because when the bar piece is welded with the electrode terminal 2, the electrode terminal 2 and the sealing plate 5 both have a height tolerance, when the sealing plate 5 is an upper tolerance and the electrode terminal 2 is a lower tolerance, the sealing plate 5 will be higher than the electrode terminal 2, or when the sealing plate 5 is a lower tolerance and the electrode terminal 2 is an upper tolerance, the electrode terminal 2 will be higher than the sealing plate 5. At this time, it is necessary to control the height of the electrode terminal 2 and the sealing plate 5, that is, to control the height difference between the first surface 22 of the electrode terminal 2 and the second surface 51 of the sealing plate 5 to be less than or equal to 0.2mm, so that when the electrode terminal 2 is welded with the sealing plate 5, the sealing plate 5 will not exceed the first surface 22 too much or the electrode terminal 2 exceeds the sealing plate 5 too much, resulting in a cold weld when the bar piece is welded with the electrode terminal 2, thereby affecting the welding stability.

[0036] It should be noted that, in the present embodiment, the housing 1 includes a cavity with an opening on one side formed by the side wall 12, and the battery cell also includes a second pole ear 32 arranged on the opening side and a cover plate 8 covering the second pole ear 32, the polarity of the first pole ear 31 is opposite to that of the second pole ear 32, and the cover plate 8 can be directly connected to the second pole ear 32, or connected to the second pole ear 32 through a current collector.

[0037] See also Figure 2 Furthermore, a second groove 6 is provided at the connection between the electrode terminal 2 and the sealing plate 5, which is recessed along the first surface 22 or the second surface 51. In the present embodiment, both the first surface 22 and the second surface 51 may be provided with a second groove 6. With such a configuration, the solder during welding can be filled in the second groove 6, and the height of the welding area during welding will not be increased, thereby affecting the welding stability between the bar sheet and the electrode terminal.

[0038] Continue to see Figure 2 In one embodiment, a welding zone 7 is provided between the sealing plate 5 and the electrode terminal 2. To weld the sealing plate 5 and the electrode terminal 2 together, solder needs to be placed between the two for welding. After high temperature melting of the solder, the sealing plate 5 and the electrode terminal 2, the welding zone 7 is formed to weld and fix the sealing plate 5 and the electrode terminal 2 together and seal. The height difference between the highest point of the welding zone 7 and the first surface 22 or the second surface 51 is 0mm-0.2mm, or the height difference between the highest point of the welding zone 7 and the first surface 22 and the second surface 51 is 0mm-0.2mm. After the sealing plate 5 and the electrode terminal 2 are welded, the second groove 6 is set to reduce the height of the welding zone 7, ensuring that the height difference between the highest point of the welding zone 7 and the first surface 22 and the second surface 51 is less than or equal to 0.2mm, which can ensure that when welding the bar sheet, the electrode terminal 2 and the sealing plate 5 have good flatness, and the bar sheet and the electrode terminal 2 will not be unable to be welded or a cold weld will occur due to the high height difference between the sealing plate 5 and the electrode terminal 2, thereby affecting the welding of the bar sheet and the stability of welding.

[0039] See also Figure 1 and Figure 2 Furthermore, the projections of the electrode terminal 2 and the sealing plate 5 in the horizontal direction are spaced apart, the electrode terminal 2 and the sealing plate 5 are two independent components, the electrode terminal 2 and the sealing plate 5 are sealed by solder welding, and after welding, there is a weld mark between the electrode terminal 2 and the sealing plate 5, which separates the electrode terminal 2 and the sealing plate 5.

[0040] Continue to see Figure 2In one embodiment, the first surface 22 is higher than the second surface 51, the highest point of the welding zone 7 is not higher than the first surface 22, the height of the sealing plate 5 is lower than the electrode terminal 2, and the height of the solder in the welding zone 7 is lower than the electrode terminal 2, or, the second surface 51 is higher than the first surface 22, the highest point of the welding zone 7 is not higher than the second surface 51, the height of the electrode terminal 2 is lower than the sealing plate 5, and the height of the solder in the welding zone 7 is lower than the sealing plate 5. In this way, the solder will not be higher than the electrode terminal 2 or the sealing plate 5, which can ensure that the welding of the bar piece and the electrode terminal 2 will not fail or a cold weld will occur.

[0041] See also Figure 4 , further, the width of the second groove 6 is 0.3mm-1.5mm, which can meet the weld line width of laser welding. The depth of the second groove 6 is 0.3mm-1mm, which can meet the weld line height of laser welding. The thickness of the sealing plate 5 is 0.5mm-1.5mm. If the thickness of the sealing plate 5 is too thin, the strength of the sealing plate 5 will be insufficient, and the strength of the electrode terminal 2 will not be strengthened. If the thickness is too thick, the inner diameter of the slot of the electrode terminal 2 will be increased, and the strength of the electrode terminal 2 will be reduced. The thickness of the electrode terminal 2 is 3mm-4mm. If the thickness of the electrode terminal 2 is too thin, the air pressure resistance will be reduced, that is, it will break from the groove under a certain air pressure. If it is too thick, it will make it difficult for the laser to penetrate. Excessive laser energy will soften the plastic between the electrode terminal 2 and the shell 1, causing the overall structure to deform.

[0042] Continue to see Figure 3 and Figure 4 Specifically, the height difference between the first surface 22 and the second surface 51 is 0.02 mm-0.1 mm. In one example, Figure 3 , the height difference between the first surface 22 and the second surface 51 is H1, that is, the first surface 22 is higher than the second surface 51. Figure 4 , the height difference between the first surface 22 and the second surface 51 is H2, that is, the second surface 51 is higher than the first surface 22, so that after the electrode terminal 2 and the sealing plate 5 are welded, the thickness of the electrode terminal 2 and the sealing plate 5 is extremely small and close to flat, and there will be no problem of welding failure or cold welding due to the protrusion of one of the electrode terminal 2 and the sealing plate 5, which affects the welding stability. The diameter of the sealing plate 5 is 3mm-20mm, and in this embodiment, it is preferably 7mm, which can not only meet the welding equipment to extend into the first groove 21 for welding, but also can ensure the strength of the electrode terminal 2 while meeting the flow area.

[0043] See also Figure 4In one embodiment, a step portion 23 is provided on the side wall of the first groove 21, and the sealing plate 5 is provided on the step portion 23. A connecting portion 24 is provided at the bottom of the first groove 21, and the connecting portion 24 is connected to the current collecting member 4. The step portion 23 can support the sealing plate 5 when the sealing plate 5 is installed in the first groove 21, and will not affect the overall strength of the electrode terminal 2. The connecting portion 24 provided at the bottom of the first groove 21 can be easily welded with the current collecting member 4.

[0044] In a second aspect, the utility model provides a battery, including the battery cell of the first aspect. The battery of this technical solution includes the battery cell of any technical solution of the utility model, and thus has all the technical effects of the battery cell of any technical solution of the utility model.

[0045] In the third aspect, the utility model provides an electric device, including the battery of the second aspect. The electric device of this technical solution includes the battery of any technical solution of the utility model, and thus has all the technical effects of the battery of any technical solution of the utility model.

[0046] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

Claims

1. A battery cell, characterized in that: include; A housing, the housing comprising a top wall and a side wall connected to each other, the top wall being provided with a first through hole; an electrode terminal, mounted in the first through hole; an electrode assembly, disposed in the housing, the electrode assembly being provided with a first electrode tab; and a current collecting member, disposed between the top wall and the first electrode tab and electrically connecting the electrode terminal and the first electrode tab; In which, the electrode terminal is provided with a first groove, and the battery cell also includes a sealing plate, which is arranged at the opening of the first groove and is electrically connected to the electrode terminal, the electrode terminal includes a first surface facing away from the electrode assembly, and the sealing plate includes a second surface facing away from the electrode assembly, and the height difference between the first surface and the second surface is 0mm-0.2mm.

2. The battery cell according to claim 1, characterized in that: The electrode terminal and the sealing plate are spaced apart from each other in a horizontal direction.

3. The battery cell according to claim 1, characterized in that: A second groove is provided at a connection between the electrode terminal and the sealing plate.

4. The battery cell according to claim 3, characterized in that: A welding zone is provided between the sealing plate and the electrode terminal, and a height difference between a highest point of the welding zone and the first surface and / or the second surface is 0 mm-0.2 mm.

5. The battery cell according to claim 4, characterized in that: The first surface is higher than the second surface, and the highest point of the weld zone is not higher than the first surface; or the second surface is higher than the first surface, and the highest point of the weld zone is not higher than the second surface.

6. The battery cell according to claim 3, characterized in that: The width of the second groove is 0.3 mm-1.5 mm; or, the depth of the second groove is 0.3 mm-1 mm; or, the thickness of the sealing plate is 0.5 mm-1.5 mm; or, the thickness of the electrode terminal is 3 mm-4 mm.

7. The battery cell according to claim 1, characterized in that: The height difference between the first surface and the second surface is 0.02 mm-0.1 mm, and / or the diameter of the sealing plate is 3 mm-20 mm.

8. The battery cell according to claim 1, characterized in that: A step portion is provided on the side wall of the first groove, the sealing plate is provided on the step portion, and a connecting portion is provided on the bottom of the first groove, and the connecting portion is electrically connected to the current collecting member.

9. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The electric device comprises the battery as claimed in claim 9.

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