Battery monomer, battery and electric device

Abstract

The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and a power utilization device. The battery monomer provided by the utility model comprises a confluence piece, the confluence piece is provided with a welding pattern, and the confluence piece is located in an area where the welding pattern is located and is used for being in welding connection with a tab; the welding pattern comprises a plurality of first welding edges, and each first welding edge comprises a first bent part and a second bent part which are bent towards the two sides of the first welding edge; the plurality of first welding edges are in central symmetry with respect to the center of the confluence sheet. The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and a power utilization device. The first bending part and the second bending part are additionally arranged, so that the first welding edge is S-shaped, the welding strength can be improved, and the heat influence and the heat deformation amount are reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] The biggest performance advantage of full-tab large cylindrical batteries is high power. The main reason for the high power is that all current collectors can act as tabs for conductivity, reducing the migration path of electrons. However, if all tabs cannot be effectively connected together when the tabs converge, the migration path of electrons will become longer, affecting the power output. Summary of the invention

[0003] The present disclosure provides a battery cell, a battery and an electrical device to at least solve the above technical problems existing in the prior art.

[0004] A first aspect of the present disclosure provides a battery cell, comprising: a busbar, the busbar being provided with a welding pattern, the busbar being located in a region where the welding pattern is located and being used for welding connection with a tab;

[0005] The welding pattern includes a plurality of first welding edges, wherein the first welding edges include a first bending portion and a second bending portion that are bent toward two sides of the first welding edge;

[0006] The plurality of first welding edges are centrally symmetric about the center of the busbar.

[0007] Furthermore, the plurality of first welding edges do not intersect with each other.

[0008] Further, the number of the first bending parts and the number of the second bending parts are both plural, and the first bending parts and the second bending parts are alternately arranged.

[0009] Furthermore, a second welding edge is provided between two adjacent first welding edges, and a plurality of the second welding edges are centrally symmetrical about the center of the busbar.

[0010] Furthermore, the first welding edge and the second welding edge do not intersect.

[0011] Furthermore, the second welding edge includes a third bent portion and a fourth bent portion bent toward two sides of the second welding edge.

[0012] Furthermore, the number of the third bending portions and the number of the fourth bending portions are both plural, and the third bending portions and the fourth bending portions are alternately arranged.

[0013] Furthermore, the battery unit further comprises a winding core, the winding core comprises a pole piece, and the pole piece has a plurality of pole ears extending from the end surface of the winding core;

[0014] The busbar is welded to the plurality of tabs at locations where the welding patterns are located.

[0015] A second aspect of the present disclosure provides a battery, comprising the battery cell described in the first aspect.

[0016] A third aspect of the present disclosure provides an electrical device, comprising the battery described in the second aspect.

[0017] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0018] The battery cell provided in the embodiment of the present disclosure includes a busbar, the busbar is provided with a welding pattern, the busbar is located in the area where the welding pattern is located for welding connection with the tab; the welding pattern includes a plurality of first welding edges, the first welding edges include a first bending portion and a second bending portion bent toward both sides of the first welding edge; the plurality of first welding edges are centrally symmetrical about the center of the busbar. The embodiment of the present disclosure increases the welding strength and reduces the heat influence and the amount of thermal deformation by adding the first bending portion and the second bending portion so that the first welding edge is serpentine.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0021] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0022] Figure 1 The structure of the busbar in the battery cell provided by the embodiment of the present disclosure is shown. Figure 1 ;

[0023] Figure 2 The structure of the busbar in the battery cell provided by the embodiment of the present disclosure is shown. Figure 2 .

[0024] Explanation of the numbers in the figure: 1, busbar; 11, first welding edge; 111, first bending portion; 112, second bending portion; 12, second welding edge; 121, third bending portion; 122, fourth bending portion. DETAILED DESCRIPTION

[0025] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0026] Combination Figure 1 and Figure 2 As shown, the battery cell provided by the embodiment of the present disclosure includes a busbar 1, the busbar 1 is provided with a welding pattern, the busbar 1 is located in the area where the welding pattern is located for welding connection with the tab; the welding pattern includes a plurality of first welding edges 11, the first welding edges 11 include a first bending portion 111 and a second bending portion 112 bent toward both sides of the first welding edge 11; the plurality of first welding edges 11 are centrally symmetrical about the center of the busbar 1. The embodiment of the present disclosure increases the welding surface, increases the welding strength, and reduces the heat influence and the amount of thermal deformation by adding the first bending portion 111 and the second bending portion 112 so that the first welding edge 11 is serpentine.

[0027] The first bend 111 and the second bend 112 can make the first welding edge 11 form a water ripple shape. This solution adopts a water ripple-shaped welding pattern in combination with actual production conditions to perform convergence from the inside to the outside. The convergence connection length and the number of convergence welding strips can be calculated based on the actual overcurrent requirements of the battery, the thickness of the tabs and the thickness of the busbar 1. In order to better perform convergence, short water ripple-shaped welding can be added on the outside to ensure that the outer tabs can be effectively connected together.

[0028] The laser welding head can achieve water pattern welding by swinging the laser head or using a galvanometer. The shape of the water pattern can reduce the concentration of the heat affected zone.

[0029] In some specific implementations, the plurality of first welding edges 11 do not intersect with each other, which can reduce the concentration of the heat-affected zone.

[0030] In some specific embodiments, the number of the first bends 111 and the number of the second bends 112 are both multiple, and the first bends 111 and the second bends 112 are alternately arranged so that the first welding line forms a water ripple shape, which can ensure that the outer tabs can be effectively connected together.

[0031] In some specific embodiments, a second welding edge 12 is provided between two adjacent first welding edges 11 , and the plurality of second welding edges 12 are centrally symmetrical about the center of the busbar 1 , which can ensure that the outer tabs can be effectively connected together.

[0032] In some specific implementations, the first welding edge 11 and the second welding edge 12 do not intersect, which can reduce the concentration of the heat-affected zone.

[0033] In some specific embodiments, the second welding edge 12 includes a third bend 121 and a fourth bend 122 that are bent toward both sides of the second welding edge 12. The third bend 121 and the fourth bend 122 can make the second welding edge 12 form a water ripple shape. In this solution, the current is converged from the inside to the outside in combination with the actual production conditions. The convergence connection length and the number of convergence welding strips can be calculated and given in combination with the actual overcurrent requirements of the battery, the thickness of the pole ear and the thickness of the busbar 1. In order to better converge, the second welding edge 12 can be added with a short water ripple welding on the outside to ensure that the outer pole ears can be effectively connected together.

[0034] In some specific embodiments, the number of the third bends 121 and the number of the fourth bends 122 are both multiple, and the third bends 121 and the fourth bends 122 are alternately arranged, which can increase the welding surface, increase the welding strength, and reduce thermal impact and thermal deformation.

[0035] On the stacked cylindrical full-tab battery, the distance between the two outermost welding points can be matched according to the width of the outermost small tab, which can effectively ensure that each tab is welded.

[0036] The long water lines formed by the first welding edge 11 are combined with the short water lines formed by the second welding edge 12. Each water line can be divided equally into circles to ensure beautiful welding. The length of the short water lines can be welded to the inner area according to actual needs, and it is not necessary to weld completely to the innermost side. The number of short water lines is matched according to the structural characteristics.

[0037] When the busbar 1 is not a full circle but is divided into sectors, the welding water pattern can be matched according to each sector.

[0038] In some specific embodiments, the battery unit also includes a winding core, which includes a pole piece, and the pole piece has multiple pole ears extending from the end face of the winding core; the busbar 1 is welded and connected to the multiple pole ears at the location of the welding pattern, which can increase the welding surface, increase the welding strength, and reduce thermal impact and thermal deformation.

[0039] In some specific embodiments, the battery cell includes a battery cell and a shell. The battery cell is a cylindrical structure formed by winding a positive electrode sheet, a negative electrode sheet and a diaphragm. The positive electrode sheet is provided with a positive electrode tab, and the negative electrode sheet is provided with a negative electrode tab. The shell is a hollow cylindrical structure with openings at both ends. The battery cell is inserted into the shell. The positive electrode column and the negative electrode column are respectively provided at both ends of the shell. The positive electrode tab is connected to the positive electrode column through a first bus bar 1, and the negative electrode tab is connected to the negative electrode column through a second bus bar 1.

[0040] In some specific embodiments, multiple positive electrode tabs connected to the positive electrode sheets and multiple negative electrode tabs connected to the negative electrode sheets are arranged on the same side of the winding structure, so that the current collectors of the positive electrode sheets and the current collectors of the negative electrode sheets can respectively collect current and output from the same side. Compared with the structure in which the tabs extend at both ends of the winding structure in the related art, this embodiment can shorten the electron path from the electrode sheet to the pole, so that the tabs do not need to guide the current through the shell, eliminating the adverse effects of the shell resistance on the internal resistance of the battery and the adverse effects of the shell heat on the internal heat dissipation of the battery, thereby reducing the internal resistance of the battery, improving the heat dissipation of the battery, and enhancing the battery power and fast charging capability.

[0041] The battery provided in the embodiment of the present disclosure includes the battery cell provided in the embodiment of the present disclosure. The electric device provided in the embodiment of the present disclosure includes the battery provided in the embodiment. Since the electric device or battery provided in the embodiment of the present disclosure has the same advantages as the battery cell provided in the embodiment of the present disclosure, they are not described in detail here.

[0042] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A battery cell, characterized in that: include: A busbar (1), the busbar (1) being provided with a welding pattern, the busbar (1) being located in an area where the welding pattern is located and being used for welding connection with the tab; The welding pattern comprises a plurality of first welding edges (11), wherein the first welding edge (11) comprises a first bending portion (111) and a second bending portion (112) bent toward two sides of the first welding edge (11); The plurality of first welding edges (11) are centrally symmetrical about the center of the busbar (1).

2. The battery cell according to claim 1, characterized in that: The plurality of first welding edges (11) do not intersect with each other.

3. The battery cell according to claim 1, characterized in that: The number of the first curved portions (111) and the number of the second curved portions (112) are both plural, and the first curved portions (111) and the second curved portions (112) are alternately arranged.

4. The battery cell according to claim 1, characterized in that: A second welding edge (12) is provided between two adjacent first welding edges (11), and a plurality of the second welding edges (12) are centrally symmetrical about the center of the busbar (1).

5. The battery cell according to claim 4, characterized in that: The first welding edge (11) and the second welding edge (12) do not intersect.

6. The battery cell according to claim 4, characterized in that: The second welding edge (12) comprises a third bent portion (121) and a fourth bent portion (122) bent towards two sides of the second welding edge (12).

7. The battery cell according to claim 6, characterized in that: The number of the third bending portions (121) and the number of the fourth bending portions (122) are both plural, and the third bending portions (121) and the fourth bending portions (122) are alternately arranged.

8. The battery cell according to claim 1, characterized in that: It also includes a winding core, the winding core includes a pole piece, and the pole piece has a plurality of pole ears extending from the end surface of the winding core; The busbar (1) is welded and connected to the plurality of tabs at locations where the welding pattern is located.

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

10. An electrical device, characterized in that: A battery comprising the battery of claim 9.

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