Battery terminal structure and battery

Abstract

The present disclosure relates to the technical field of battery cells, and provides a battery terminal structure and a battery comprising the battery terminal structure. The battery terminal structure comprises a negative electrode assembly. The negative electrode assembly comprises a negative terminal post and a negative busbar. The negative busbar is welded to one end of the negative terminal post, and comprises a first busbar region and a second busbar region connected to each other. The second busbar region forms a bending portion at a connection location between the second busbar region and the first busbar region. An included angle of the second busbar region relative to the first busbar region is adjustable by bending the bending portion. The battery terminal structure and the battery allow the welding appearance between the negative busbar and the negative terminal post to be visually inspected, so as to identify false welding or disconnected welding. In addition, the first busbar region in the negative busbar can be used as a connecting member during series connection or parallel connection without the need to use additional connecting members, thereby achieving the beneficial effects of reducing welding points, optimizing battery internal resistance, and prolonging battery cycle life.

Description

Battery terminal structure and battery

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202422698371.3, filed on November 5, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery cell technology, and in particular to a battery terminal structure and a battery. Background Technology

[0004] 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 battery cell 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.

[0005] 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.

[0006] 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. Summary of the Invention

[0007] This disclosure provides a battery terminal structure and a battery 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.

[0008] The battery terminal structure provided in this disclosure includes a negative electrode assembly;

[0009] The negative electrode assembly includes a negative electrode post and a negative electrode busbar;

[0010] 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.

[0011] The second busbar area has a bend at its connection with the first busbar area;

[0012] The first busbar area can change the included angle of the second busbar area by bending through the bending portion.

[0013] In one possible implementation, the bent portion is capable of being bent at least twice at different crease positions;

[0014] Both the first and second busbar areas can be bent in parallel.

[0015] In one embodiment, two opposing angled slots are formed on the side of the first busbar area closest to the second busbar area.

[0016] In one possible implementation, the negative electrode assembly further includes a negative electrode top cover;

[0017] The negative electrode top cover is fitted onto the outer peripheral wall of the negative electrode post by an outer insulating ring.

[0018] 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.

[0019] In one possible embodiment, the battery terminal structure further includes a positive electrode assembly;

[0020] The positive electrode assembly includes a composite positive electrode busbar, and a welding ring is provided in the composite positive electrode busbar.

[0021] In one embodiment, the welding ring is integrally connected to the composite positive electrode busbar;

[0022] Furthermore, the welding ring is located on the outer periphery of the composite positive electrode busbar.

[0023] In one possible implementation, the positive electrode assembly further includes a bottom cover;

[0024] The welding ring in the composite positive electrode busbar can be welded to the bottom cover.

[0025] In addition, this disclosure also provides a battery, which includes a winding core and the above-described battery terminal structure;

[0026] The negative electrode busbar in the negative electrode assembly is welded to the negative electrode tab of the winding core;

[0027] The composite positive electrode busbar in the positive electrode assembly is welded to the positive electrode tab of the core.

[0028] In one possible embodiment, the battery further includes a housing component;

[0029] The negative electrode assembly and the positive electrode assembly are respectively sealed and welded to both ends of the housing component.

[0030] The technical solutions provided in this disclosure have the following advantages compared with the prior art.

[0031] 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 first busbar area on 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, allowing for visual inspection of the weld between the negative electrode busbar and the negative terminal, 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. This allows the first busbar area in the negative electrode busbar to be used as a connector when multiple batteries are connected in series or parallel, eliminating the need for additional connectors. This reduces welding points, optimizes battery internal resistance, and improves battery cycle life.

[0032] 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.

[0033] 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

[0034] 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:

[0035] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0036] Figure 1 shows a schematic diagram of the negative electrode assembly in the battery terminal structure provided in the embodiments of this disclosure.

[0037] Figure 2 shows a schematic diagram of the negative electrode busbar in the battery terminal structure provided in the embodiments of this disclosure.

[0038] Figure 3 shows a schematic diagram of the positive electrode component in the battery terminal structure provided in the embodiments of this disclosure.

[0039] Figure 4 shows an exploded view of the structure of the battery provided in an embodiment of this disclosure.

[0040] Figure 5 shows a bottom schematic diagram of the battery provided in an embodiment of this disclosure.

[0041] The following are the labels in the diagram: 1. Negative terminal post; 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 section; 6. Composite positive terminal busbar; 61. Welding ring; 7. Bottom cover; 8. Housing component. Detailed Implementation

[0042] 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.

[0043] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0044] Referring to Figures 1 and 2, this 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.

[0045] 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. The first busbar area 51 on the opposite 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. This allows for visual inspection of the weld between the negative terminal busbar 5 and the negative terminal post 1, enabling the identification of incomplete or faulty welds.

[0046] 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.

[0047] 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.

[0048] Specifically, referring to Figure 2 for further details, the bending portion 521 is specifically designed as a rectangular sheet portion, and the two long sides of the rectangular sheet portion are connected to the first busbar area 51 and the second busbar area 52 respectively. In this way, folding grooves or folding marks can be preset in the two long sides of the bending portion 521 respectively, so that the structural strength of the two long sides is relatively weakened, forming linear easy folding marks, so that the first busbar area 51 and the second busbar area 52 can be bent in parallel to form a "Z"-shaped structure, so as to better serve as a connector when the battery is connected in series or in parallel.

[0049] 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.

[0050] 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.

[0051] Specifically, as explained in further detail with reference to Figure 2, 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.

[0052] 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.

[0053] Specifically, as explained in further detail with reference to Figure 1, the negative electrode top cover 3 is pressed and riveted to the outer peripheral wall of the negative electrode post 1 by means of 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.

[0054] 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.

[0055] Specifically, as explained in further detail with reference to Figure 1, similarly, the lower side of the negative electrode top cover 3 is pressed and riveted to the second busbar area 52 in the negative electrode busbar 5 by the inner insulating ring 4. This ensures the insulation and sealing between the negative electrode top cover 3 and the second busbar area 52.

[0056] 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.

[0057] Specifically, as explained in further detail with reference to Figure 3, 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.

[0058] 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.

[0059] Specifically, as explained in further detail with reference to Figure 3, 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.

[0060] 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.

[0061] Specifically, as explained in further detail with reference to Figure 4, 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 weld strength and sealing.

[0062] 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.

[0063] Specifically, as further explained in Figure 4, the battery includes a core and the aforementioned battery terminal structure, which can achieve all the beneficial effects of the aforementioned battery terminal structure, and will not be elaborated further here.

[0064] 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.

[0065] Specifically, as further explained in conjunction with Figures 4 and 5, 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, welded, and covered at both ends of the housing component 8.

[0066] In use, the battery terminal structure of this application allows the positive electrode component to be used in a manner that is not limited to being used solely as a positive electrode component, and similarly, the negative electrode component is not limited to being used solely as a negative electrode component. Specifically, depending on the type of battery, the negative electrode component can be used as a positive electrode component by adjusting its material; and conversely, the positive electrode component can be used as a negative electrode component by adjusting its material. The battery terminal structure of this application can be flexibly configured in use.

[0067] 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.

[0068] 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, wherein, 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, wherein, 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, wherein, 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, wherein, 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 means of an outer insulating ring (2).

5. The battery terminal structure according to claim 4, wherein, 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, wherein, 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, wherein, 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, wherein, The positive electrode assembly also includes a bottom cover (7); The welding ring (61) in the composite positive electrode busbar (6) is welded to the bottom cover (7).

9. A battery, wherein, Includes a winding core and a battery terminal structure as described in any one of claims 1 to 8; The negative electrode busbar (5) in the negative electrode assembly is welded to the negative electrode tab of the 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, wherein, 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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