Battery pole structure and battery

Abstract

The utility model relates to the technical field of battery cells, and provides a battery pole structure and a battery. The negative electrode assembly comprises a negative electrode column and a negative electrode confluence sheet; the negative bus bar is welded at one end of the negative pole and comprises a first bus bar area and a second bus bar area which are connected with each other; a bending part is formed at the joint of the second bus bar area and the first bus bar area; the first bus bar area can change the included angle of the second bus bar area through bending of the bending part. The latter comprises the former. According to the battery pole structure and the battery, detection can be visually carried out through the welding appearance of the negative electrode bus piece and the negative electrode, pseudo soldering and broken soldering can be judged, the first bus piece area in the negative electrode bus piece can be used as a connecting piece during series-parallel connection, no connecting piece needs to be additionally used, and the cost is reduced. Therefore, the beneficial effects of reducing welding points, optimizing the internal resistance of the battery and prolonging the cycle service life of the battery can be achieved.

Description

Technical Field

[0001] This disclosure relates to the field of battery cell technology, and in particular to a battery terminal structure and a battery. Background Technology

[0002] Taking a cylindrical battery as an example, its structure generally includes a positive electrode busbar, a negative electrode busbar, a positive electrode post, a negative electrode post, a positive top cover, a negative end cover, a sealing pin, and a battery cell. The positive end is formed by welding the battery cell to the positive electrode busbar and welding the positive electrode busbar to the post. The negative end is formed by welding the core to the negative electrode busbar, welding the negative electrode busbar to the casing, welding the bottom cover to the casing, and welding the sealing pin to the bottom cover.

[0003] However, the conventional cylindrical battery structure mentioned above contains many battery structural components and involves many welding processes. This results in a complex internal structure and high resistance and heat generation when current passes through the conductor welding structure, which affects the battery's cycle life.

[0004] In view of this, there is an urgent need in the market for a new type of cylindrical battery structure to solve the problems of multiple welding processes at the positive and negative ends of existing cylindrical batteries, which lead to high battery resistance and affect battery cycle life. Utility Model Content

[0005] This disclosure provides a battery terminal structure and a battery, in order to solve the problems of existing cylindrical batteries, such as multiple welding processes at the positive and negative ends, resulting in high battery resistance and affecting battery cycle life.

[0006] The battery terminal structure provided in this disclosure includes a negative electrode assembly;

[0007] The negative electrode assembly includes a negative electrode post and a negative electrode busbar;

[0008] The negative electrode busbar is welded to one end of the negative electrode post and includes a first busbar area and a second busbar area that are connected to each other.

[0009] The second busbar area has a bend at its connection with the first busbar area;

[0010] The first busbar area can change the included angle of the second busbar area by bending through the bending portion.

[0011] In one possible implementation, the bent portion is capable of being bent at least twice at different crease positions;

[0012] Both the first and second busbar areas can be bent in parallel.

[0013] In one embodiment, two opposing angled slots are formed on the side of the first busbar area closest to the second busbar area.

[0014] In one possible implementation, the negative electrode assembly further includes a negative electrode top cover;

[0015] The negative electrode top cover is fitted onto the outer peripheral wall of the negative electrode post by an outer insulating ring.

[0016] In one embodiment, the second busbar region of the negative busbar is crimped to the lower side of the negative top cover by an inner insulating ring.

[0017] In one possible implementation, a positive electrode component is also included;

[0018] The positive electrode assembly includes a composite positive electrode busbar, and a welding ring is provided in the composite positive electrode busbar.

[0019] In one embodiment, the welding ring is integrally connected to the composite positive electrode busbar;

[0020] Furthermore, the welding ring is located on the outer periphery of the composite positive electrode busbar.

[0021] In one possible implementation, the positive electrode assembly further includes a bottom cover;

[0022] The welding ring in the composite positive electrode busbar can be welded to the bottom cover.

[0023] In addition, this disclosure also provides a battery, which includes a winding core and the above-described battery terminal structure;

[0024] The negative electrode busbar in the negative electrode assembly is welded to the negative electrode tab of the winding core;

[0025] The composite positive electrode busbar in the positive electrode assembly is welded to the positive electrode tab of the core.

[0026] In one possible embodiment, the battery further includes a housing component;

[0027] The negative electrode assembly and the positive electrode assembly are respectively sealed and welded to both ends of the housing component.

[0028] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0029] The battery terminal structure provided in this embodiment allows the bottom end of the negative terminal in the negative electrode assembly to be welded to one side of the second busbar area in the negative electrode busbar. The opposite side of the second busbar area can be welded to the negative electrode tab in the core. Furthermore, the first busbar area in the negative electrode busbar can be protruded outwards. This allows for visual inspection of the weld between the negative electrode busbar and the negative electrode 1, identifying instances of incomplete or faulty welds. Since the second busbar forms a bend at its connection with the first busbar area, bending this bend at a certain angle allows the first and second busbar areas to be parallel to each other and at different horizontal levels, forming a "Z"-shaped structure. When multiple batteries are connected in series or parallel, the first busbar area in the negative electrode busbar can be used as a connector, eliminating the need for additional connectors. This reduces welding points, optimizes battery internal resistance, and improves battery cycle life.

[0030] Furthermore, the battery provided in this embodiment, including the battery terminal structure described above, can achieve the same beneficial effects, and will not be described in detail here.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0032] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0033] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0034] Figure 1 A schematic diagram of the negative electrode assembly in the battery terminal structure provided in this embodiment of the present disclosure is shown;

[0035] Figure 2 A schematic diagram of the negative electrode busbar in the battery terminal structure provided in this embodiment of the present disclosure is shown;

[0036] Figure 3 A schematic diagram of the positive electrode assembly in the battery terminal structure provided in this embodiment of the present disclosure is shown;

[0037] Figure 4 An exploded view of the battery structure provided in an embodiment of this disclosure is shown;

[0038] Figure 5 A bottom schematic diagram of a battery provided in an embodiment of this disclosure is shown.

[0039] The following are the labels in the diagram: 1. Negative terminal post; 11. Connecting part; 2. Outer insulating ring; 3. Negative terminal top cover; 4. Inner insulating ring; 5. Negative terminal busbar; 51. First busbar area; 511. Angle slot; 52. Second busbar area; 521. Bending part; 6. Composite positive terminal busbar; 61. Welding ring; 7. Bottom cover; 8. Housing component. Detailed Implementation

[0040] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0041] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0042] Combination Figure 1 and Figure 2 As shown, this embodiment of the present disclosure provides a battery terminal structure, which includes a negative electrode assembly; the negative electrode assembly includes a negative electrode post 1 and a negative electrode busbar 5; the negative electrode busbar 5 is welded to one end of the negative electrode post 1 and includes a first busbar region 51 and a second busbar region 52 connected to each other; the second busbar region 52 forms a bent portion 521 at the connection with the first busbar region 51; the first busbar region 51 can be bent by the bent portion 521 to change the included angle of the second busbar region 52.

[0043] During assembly, the bottom end of the negative terminal post 1 in the negative terminal assembly can be welded to one side of the second busbar area 52 in the negative terminal busbar 5, and the other side of the second busbar area 52 can be welded to the negative terminal tab in the core. Furthermore, the first busbar area 51 in the negative terminal busbar 5 can be protruded outwards accordingly. In this way, the appearance of the weld between the negative terminal busbar 5 and the negative terminal post 1 can be visually inspected, and the phenomena of poor welding and broken welding can be identified.

[0044] Furthermore, since the second busbar region 52 forms a bend 521 at the connection with the first busbar region 51, by bending the bend 521 at a certain angle, the first busbar region 51 and the second busbar region 52 can be made parallel to each other and in horizontal planes at different heights, forming a structure similar to a "Z". In this way, when multiple batteries are connected in series or in parallel, the first busbar region 51 in the negative electrode busbar 5 can be used as a connector in series and parallel connection without the need for additional connectors. This achieves the beneficial effects of reducing welding points, optimizing battery internal resistance, and improving battery cycle life.

[0045] In one embodiment, the bending portion 521 can be bent at least twice at different crease positions; and the first busbar area 51 and the second busbar area 52 can be bent in parallel.

[0046] Specifically, in combination Figure 2 In further detail, the bending portion 521 is specifically designed as a rectangular sheet, and the two long sides of the rectangular sheet are connected to the first busbar area 51 and the second busbar area 52 respectively. This allows for the pre-setting of folding grooves or folding marks on the two long sides of the bending portion 521, which weakens the structural strength of the two long sides and forms linear easy folding marks. This enables the first busbar area 51 and the second busbar area 52 to be bent in parallel, forming a Z-shaped structure, which is better suited for use as a connector when batteries are connected in series or in parallel.

[0047] The specific arrangement of the bending portion 521 in the negative electrode busbar 5 described above has the advantages of simple structure and easy parallel bending of the first busbar area 51 and the second busbar area 52.

[0048] In one embodiment, two opposing angle slots 511 are formed on the side of the first busbar area 51 near the second busbar area 52.

[0049] Specifically, in combination Figure 2 In further detail, the two opposing angle slots 511 are inclined at an obtuse angle to each other, and the two opposing angle slots 511 are symmetrically arranged about the central axis of the negative electrode busbar 5 in the length direction. In this way, when the negative electrode busbar 5 is bent parallel to each other by the bending part 521, the two opposing angle slots 511 can avoid stress concentration during the bending process, thereby avoiding damage to the negative electrode tab in the core when the negative electrode busbar 5 is bent.

[0050] In one embodiment, the negative electrode assembly further includes a negative electrode top cover 3; the negative electrode top cover 3 is fitted onto the outer peripheral wall of the negative electrode post 1 by means of an outer insulating ring 2.

[0051] Specifically, in combination Figure 1 In further detail, the negative electrode top cover 3 is pressed and riveted to the outer peripheral wall of the negative electrode post 1 by the outer insulating ring 2. This can ensure the insulation and sealing between the negative electrode top cover 3 and the negative electrode post 1. Moreover, the pressing and riveting process can also ensure the compactness and reliability of the installation structure of the negative electrode top cover 3.

[0052] In one embodiment, the second busbar area 52 in the negative busbar 5 is riveted to the lower side of the negative top cover 3 by an inner insulating ring 4.

[0053] Specifically, in combination Figure 1 To elaborate further, similarly, the lower side of the negative electrode top cover 3 is crimped to the second busbar area 52 in the negative electrode busbar 5 by the inner insulating ring 4, which ensures the insulation and sealing between the negative electrode top cover 3 and the second busbar area 52.

[0054] In one embodiment, the battery terminal structure further includes a positive electrode assembly; the positive electrode assembly includes a composite positive electrode busbar 6, and a welding ring 61 is provided in the composite positive electrode busbar 6.

[0055] Specifically, in combination Figure 3 In further detail, the positive electrode assembly is configured as a composite positive electrode busbar 6, and a welding ring 61 is provided in the composite positive electrode busbar 6. In this way, the inner side of the composite positive electrode busbar 6 can be welded to the positive electrode tab in the core, and the outer side of the composite positive electrode busbar 6 can be welded and fixed to the bottom cover 7 in the battery through the welding ring 61.

[0056] In one embodiment, the welding ring 61 is integrally connected to the composite positive electrode busbar 6; and the welding ring 61 is located on the outer periphery of the composite positive electrode busbar 6.

[0057] Specifically, in combination Figure 3 To explain in further detail, the welding ring 61 is integrally connected to the composite positive electrode busbar 6, and the welding ring 61 is located on the outer periphery of the composite positive electrode busbar 6. In this way, the welding ring 61 on the outer periphery of the composite positive electrode busbar 6 can form a closed periphery welding ring, which fully ensures the welding firmness and welding sealing of the composite positive electrode busbar 6.

[0058] In one embodiment, the positive electrode assembly further includes a bottom cover 7; the welding ring 61 in the composite positive electrode busbar 6 can be welded to the bottom cover 7.

[0059] Specifically, in combination Figure 4 To elaborate further, the welding ring 61 on the outer periphery of the composite positive electrode busbar 6 can be directly welded to the bottom cover 7 in the battery using a laser through-welding process. This process is highly efficient and ensures both the strength and sealing of the weld.

[0060] In addition, this disclosure also provides a battery, which includes a winding core and the battery terminal structure described above; the negative electrode busbar 5 in the negative electrode assembly is welded to the negative electrode tab of the winding core; the composite positive electrode busbar 6 in the positive electrode assembly is welded to the positive electrode tab of the winding core.

[0061] Specifically, in combination Figure 4 To provide a more detailed explanation, the battery includes a core and the aforementioned battery terminal structure, which achieves all the beneficial effects of the aforementioned battery terminal structure, and will not be elaborated further here.

[0062] In one embodiment, the battery further includes a housing component 8; the negative electrode assembly and the positive electrode assembly are respectively sealed and welded to both ends of the housing component 8.

[0063] Specifically, in combination Figure 4 and Figure 5 In further detail, the housing component 8 can be specifically, but not limited to, a cylindrical component, in which the negative electrode assembly and the positive electrode assembly are respectively sealed and welded to both ends of the housing component 8.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0065] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery terminal structure, characterized in that, Including the negative electrode component; The negative electrode assembly includes a negative electrode post (1) and a negative electrode busbar (5); The negative electrode busbar (5) is welded to one end of the negative electrode post (1) and includes a first busbar area (51) and a second busbar area (52) that are connected to each other. The second busbar area (52) forms a bend (521) at the connection with the first busbar area (51); The first busbar area (51) can change the included angle of the second busbar area (52) by bending through the bending portion (521).

2. The battery terminal structure according to claim 1, characterized in that, The bending section (521) is capable of undergoing at least two bends at different crease positions; The first busbar area (51) and the second busbar area (52) can be bent in parallel.

3. The battery terminal structure according to claim 1, characterized in that, Two opposing angle slots (511) are provided on the side of the first busbar area (51) near the second busbar area (52).

4. The battery terminal structure according to claim 3, characterized in that, The negative electrode assembly also includes a negative electrode top cover (3); The negative electrode top cover (3) is fitted onto the outer peripheral wall of the negative electrode post (1) by an outer insulating ring (2).

5. The battery terminal structure according to claim 4, characterized in that, The second busbar area (52) in the negative busbar (5) is riveted to the lower side of the negative top cover (3) by an inner insulating ring (4).

6. The battery terminal structure according to claim 1, characterized in that, It also includes the positive electrode component; The positive electrode assembly includes a composite positive electrode busbar (6), and a welding ring (61) is provided in the composite positive electrode busbar (6).

7. The battery terminal structure according to claim 6, characterized in that, The welding ring (61) is integrally connected to the composite positive electrode busbar (6); Furthermore, the welding ring (61) is located on the outer periphery of the composite positive electrode busbar (6).

8. The battery terminal structure according to claim 6, characterized in that, The positive electrode assembly also includes a bottom cover (7); The welding ring (61) in the composite positive electrode busbar (6) can be welded to the bottom cover (7).

9. A battery, characterized in that, Includes the winding core and the battery terminal structure as described in any one of claims 6 to 8; The negative electrode busbar (5) in the negative electrode assembly is welded to the negative electrode lug of the winding core; The composite positive electrode busbar (6) in the positive electrode assembly is welded to the positive electrode tab of the core.

10. The battery according to claim 9, characterized in that, The battery also includes a housing (8); The negative electrode assembly and the positive electrode assembly are respectively sealed and welded to both ends of the housing component (8).

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