Tab connecting structure and battery
By designing the electrode connection structure, the first part of the electrode is bent and exposed to the explosion-proof port, solving the problem of the electrode blocking the explosion-proof valve and improving the safety of the battery.
Patent Information
- Application Number
- CN202422707677.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-11-06
AI Technical Summary
With the increase in overcurrent demand, the width of the extreme ear needs to increase, but due to the limitation of the cover length, the extreme ears block the exhaust passage of the explosion-proof valve, affecting battery safety.
A polar ear connection structure is designed so that the first part of the polar ear is bent toward the second part along the first fold line, exposing the explosion-proof opening, ensuring the unobstructedness of the explosion-proof valve and avoiding the explosion-proof valve from being blocked by the explosion-proof valve.
By exposing the explosion-proof valve, the smoothness of the exhaust passage is ensured and the safety of the battery is improved.
Smart Images
Figure CN223273473U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a tab connection structure and a battery. Background Art
[0002] Lithium-ion batteries are widely used in various fields such as transportation power supply, electric energy storage power supply, new energy energy storage power supply, aerospace and military industry due to their advantages such as large capacity, high operating voltage, strong charge retention ability and long cycle life.
[0003] The structure of a single lithium battery generally consists of a pole group, electrolyte, cover, shell, and internal and external insulation. The cover and shell are usually fixed together by laser welding, forming a sealed space that protects the pole group and provides a certain degree of structural strength. The cover generally integrates functional areas such as the pole post, explosion-proof valve, and injection port. The pole group is electrically connected to the pole post base of the cover by laser welding the pole tab to achieve electrical connection, thereby conducting the current inside the battery cell out of the shell.
[0004] However, with the increasing demands for single-cell capacity, charge / discharge rates, and fast charging, tab width has become a key constraint on the internal structure of battery cells. As current requirements increase, the tab width needs to be wider for the same foil thickness and number of layers. However, due to the length limitations of the cover plate, in order to meet current requirements, the tab will partially block the exhaust passage of the explosion-proof valve, thereby affecting exhaust efficiency and even battery safety. Utility Model Content
[0005] The present application aims to provide a tab connection structure and battery that, to a certain extent, addresses the technical problem in the prior art where, as current requirements increase, the tab width needs to be wider while maintaining the same foil thickness and number of layers. However, due to the length limitation of the cover plate, to meet the current requirement, the tab partially blocks the exhaust passage of the explosion-proof valve, thereby affecting the exhaust effect and even the safety of the battery.
[0006] According to a first aspect of the present application, a tab connection structure is provided, comprising a cover plate assembly and a pole group assembly, wherein the cover plate assembly comprises a cover plate body and a pole column, wherein the cover plate body is provided with an explosion-proof opening penetrating the cover plate body along a first direction, wherein the explosion-proof opening is used to provide an explosion-proof valve;
[0007] The pole group assembly includes a pole group body and a pole lug, the pole lug is led out from one end of the pole group body in the first direction, the pole lug is attached to the inner side of the cover plate assembly, and is electrically connected to the pole post, the first part of the pole lug is bent along a first fold line toward the second part of the pole lug, the first part of the pole lug is the part of the pole lug overlapping with the explosion-proof opening in the first direction, so that the explosion-proof opening can be exposed by the pole lug.
[0008] Preferably, the pole and the explosion-proof opening are arranged side by side on the cover body along a second direction, and the second direction intersects the first direction;
[0009] The first portion is provided at an end portion of the second portion in the second direction.
[0010] Preferably, the tab further includes a third portion, and the first portion and the third portion are respectively arranged at two ends of the second portion in the second direction;
[0011] The third portion of the tab is bent along a second fold line toward the second portion of the tab.
[0012] Preferably, the tab has an axis of symmetry, and the axis of symmetry extends along the first direction;
[0013] The first fold line and the second fold line are symmetrical about the symmetry axis.
[0014] Preferably, the cover assembly further comprises a plastic part, and the plastic part is arranged on the inner side of the cover body;
[0015] In the first direction, a portion of the plastic part facing the explosion-proof opening is provided with a breathable mesh hole penetrating the plastic part along the first direction, and the breathable mesh hole can be exposed by the tab.
[0016] Preferably, the pole includes a top plate, a bottom plate and a connecting column, wherein the top plate and the bottom plate are respectively arranged on both sides of the cover plate body in the first direction, and the connecting column penetrates the cover plate body along the first direction and connects the top plate and the bottom plate;
[0017] The tab is connected to the pole via the bottom plate.
[0018] Preferably, the tab is bent along a third fold line so that the tab is parallel to the cover body, and the third fold line extends along a second direction, and the second direction intersects the first direction;
[0019] The angle between the first fold line and the third fold line is an acute angle.
[0020] Preferably, the second portion extends along the second direction, and the second portion includes a first stacking region, a single-layer region, and a second stacking region sequentially arranged along the second direction;
[0021] The first stacked region is a portion of the second portion that overlaps with the first portion, and the second stacked region is a portion of the second portion that overlaps with the third portion.
[0022] Preferably, the terminal lug and the terminal post are welded together according to a predetermined weld mark;
[0023] The predetermined weld mark extends from the single-layer area along the second direction to the first laminated area and the second laminated area respectively.
[0024] According to the second aspect of the present application, a battery is provided, comprising the tab connection structure described in any of the above technical solutions, and thus having all the beneficial technical effects of the tab connection structure, which will not be described in detail here.
[0025] Compared with the prior art, the present invention has the following advantages:
[0026] The tab connection structure provided in the present application enables the explosion-proof opening to be exposed by the tab by bending the first portion of the tab that overlaps with the explosion-proof opening in the first direction along the first fold line toward the second portion of the tab, thereby preventing the tab from blocking the explosion-proof opening and ensuring the patency of the exhaust passage of the explosion-proof valve, thereby improving the safety of the battery.
[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0029] Figure 1 A schematic diagram of the axonometric structure of the tab connection structure provided in an embodiment of the present application;
[0030] Figure 2 A schematic diagram of the axonometric structure of a pole provided in an embodiment of the present application;
[0031] Figure 3 A schematic front view of the structure of the tab connection structure provided in an embodiment of the present application;
[0032] Figure 4 A schematic diagram of the axonometric structure of the tab connection structure provided in an embodiment of the present application in an unfolded state;
[0033] Figure 5 A schematic front view of the tab connection structure provided in an embodiment of the present application in an expanded state;
[0034] Figure 6This is a schematic diagram of the axonometric structure of the battery provided in an embodiment of the present application.
[0035] Reference numerals:
[0036] 11-cover plate body; 12-plastic part; 121-breathable mesh; 2-pole ear; 20-pole group body; 201-first fold line; 202-second fold line; 203-third fold line; 204-symmetry axis; 21-first part; 22-second part; 221-first laminated area; 222-second laminated area; 223-single-layer area; 23-third part; 3-explosion-proof valve; 4-pole column; 5-predetermined weld mark.
[0037] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION
[0038] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.
[0039] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.
[0040] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.
[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0043] Refer to the following Figures 1 to 6 The tab 2 connection structure and the battery according to some embodiments of the present application are described.
[0044] See also Figures 1 to 6 As shown, an embodiment of the first aspect of the present application provides a tab 2 connection structure, which includes a cover plate assembly and a pole group assembly. The cover plate assembly includes a cover plate body 11 and a pole post 4. The cover plate body 11 is provided with an explosion-proof opening that penetrates the cover plate body 11 along a first direction F1. The explosion-proof opening is used to install an explosion-proof valve 3. The pole group assembly includes a pole group body 20 and a tab 2. The tab 2 is extended from one end of the pole group body 20 in the first direction F1. The tab 2 is attached to the inner side of the cover plate assembly and is electrically connected to the pole post 4. The first portion 21 of the tab 2 is bent along a first fold line 201 toward the second portion 22 of the tab 2. The first portion 21 of the tab 2 is the portion of the tab 2 that overlaps with the explosion-proof opening in the first direction F1, so that the explosion-proof opening can be exposed by the tab 2. In this way, by bending the first part 21 of the pole lug 2 that overlaps with the explosion-proof opening in the first direction F1 toward the second part 22 of the pole lug 2 along the first fold line 201, the explosion-proof opening can be exposed by the pole lug 2, and the pole lug 2 can be prevented from blocking the explosion-proof opening, thereby ensuring the patency of the exhaust channel of the explosion-proof valve 3 and improving the safety of the battery.
[0045] like Figures 1 to 6 As shown, F1 shown in the figure may be an example of the first direction F1, and F2 shown in the figure may be an example of the second direction F2 described below. The first direction F1 and the second direction F2 intersect. Preferably, as Figures 1 to 6 The first direction F1 is perpendicular to the second direction F2. For ease of description, a direction perpendicular to a plane defined by the first direction F1 and the second direction F2 is defined as a third direction F3. The F3 shown in the figure may be an example of the third direction F3.
[0046] like Figures 1 to 6 The example of the tab 2 connection structure being adapted for a prismatic battery is shown. The cover body 11 can be positioned over one end of the prismatic battery in a first direction F1. For example, if the first direction F1 is parallel to the length of the prismatic battery, the second direction F2 can be parallel to the width of the battery, and the third direction F3 can be parallel to the thickness of the battery. However, this is not limiting; the tab 2 connection structure is not limited to prismatic batteries and can also be applied to cylindrical or other shaped batteries. Furthermore, the first, second, and third directions F1, F2, and F3 can be adaptively adjusted based on the position of the cover body 11 on the battery.
[0047] Preferably, if Figure 6As shown, the pole 4 and the explosion-proof opening are arranged side by side on the cover body 11 along the second direction F2. The first portion 21 is arranged at the end of the second portion 22 in the second direction F2.
[0048] Preferably, if Figure 5 As shown, the tab 2 is bent along the third fold line 203 so that the tab 2 is parallel to the cover body 11. The third fold line 203 extends along the second direction F2. Preferably, the angle between the first fold line 201 and the third fold line 203 can be an acute angle to facilitate the bending of the first portion 21.
[0049] Alternatively, as Figures 1 to 3 As shown, the first portion 21 can be bent along the first fold line 201 toward the side of the second portion 22 facing away from the cover body 11 , so as to facilitate folding and fixing of the tab 2 .
[0050] Preferably, if Figures 1 to 6 As shown, the tab 2 may further include a third portion 23. The first portion 21 and the third portion 23 may be respectively disposed at both ends of the second portion 22 in the second direction F2. The third portion 23 of the tab 2 may be bent along the second fold line 202 toward the second portion 22 of the tab 2, so that the tab 2 avoids the other side structure of the cover body 11.
[0051] Correspondingly, if Figures 1 to 3 As shown, the third portion 23 may also be bent along the second fold line 202 toward the side of the second portion 22 facing away from the cover body 11 , so as to facilitate folding and fixing of the tab 2 .
[0052] Preferably, if Figure 5 As shown, the tab 2 may have a symmetry axis 204 , and the symmetry axis 204 extends along the first direction F1 . In other words, the tab 2 may be an axisymmetric shape.
[0053] Preferably, if Figure 5 As shown, the first fold line 201 and the second fold line 202 may be symmetrical about the symmetry axis 204 .
[0054] Preferably, if Figures 1 to 5 As shown, the second portion 22 may extend along the second direction F2, and may include a first laminated region 221, a single-layer region 223, and a second laminated region 222 sequentially arranged along the second direction F2, wherein the first laminated region 221 is the portion of the second portion 22 that overlaps with the first portion 21, and the second laminated region 222 is the portion of the second portion 22 that overlaps with the third portion 23. In other words, the area of the second portion 22 is greater than the sum of the areas of the first portion 21 and the third portion 23, further ensuring the current flow capacity of the tab 2.
[0055] Preferably, if Figure 1 and Figure 3 As shown, the above-mentioned tab 2 and pole 4 can be welded and connected according to a predetermined weld mark 5, wherein the predetermined weld mark 5 can extend along the second direction F2, and the predetermined weld mark 5 extends from the single-layer area 223 along the second direction F2 to the first laminated area 221 and the second laminated area 222 respectively. On the one hand, the connection stability and contact area between the tab 2 and the pole 4 are ensured, thereby ensuring the power transmission capacity of the battery; on the other hand, the first laminated area 221 (i.e., the overlapping part of the first part 21 and the second part 22) and the second laminated area 222 (i.e., the overlapping part of the second part 22 and the third part 23) can be fixed by the weld mark, thereby ensuring the stability of the shape of the tab 2.
[0056] Optionally, the electrode tab 2 and the electrode post 4 may be connected via laser welding.
[0057] Preferably, if Figure 1 、 Figure 3 and Figure 6 As shown, the cover assembly may further include a plastic part 12, which is arranged on the inner side of the cover body 11 to be used for insulating the cover body 11. Figure 2 and Figure 3 As shown, in the first direction F1, the portion of the plastic part 12 facing the explosion-proof opening is provided with a breathable mesh 121 that penetrates the plastic part 12 along the first direction F1. Correspondingly, the breathable mesh 121 can be exposed by the tab 2 to further ensure the smooth exhaust of the explosion-proof valve 3.
[0058] Preferably, (not shown in the figures), the pole 4 may include a top plate, a bottom plate, and a connecting column. The top plate and bottom plate are respectively disposed on opposite sides of the cover body 11 in the first direction F1. The connecting column extends through the cover body along the first direction F1 and connects the top plate and bottom plate. The tab 2 is connected to the pole 4 via the bottom plate. This facilitates the positioning of the tab 2 relative to the cover body 11 and effectively increases the flow area of the pole 4, ensuring the flow capacity of the pole 4.
[0059] Preferably, although not shown in the figures, at least a portion of the plastic part 12 may be disposed between the bottom plate and the cover body 11 to achieve insulation between the bottom plate and the cover body 11 .
[0060] Preferably, although not shown in the figures, the above-mentioned cover assembly may further include an upper plastic part and an insulating ring. The upper plastic part is covered on the side of the top plate facing the bottom plate and is arranged between the upper plastic part and the cover body 11. The insulating ring is sleeved on the outside of the connecting column, and the two ends of the insulating ring in the first direction F1 are respectively connected to the upper plastic part and the plastic part 12. In this way, on the one hand, the insulation between the cover body 11 and the pole 4 is effectively guaranteed; on the other hand, the separate arrangement of the upper plastic part, the insulating ring and the plastic part 12 effectively facilitates the assembly of the cover assembly. It should be noted that the structure of the above-mentioned upper plastic part, the insulating ring, the plastic part 12 and the assembly relationship with the pole 4 are existing structures in the field and will not be repeated here.
[0061] The embodiment of the second aspect of the present application further provides a battery, comprising the tab 2 connection structure of any of the above embodiments, and thus having all the beneficial technical effects of the tab 2 connection structure, which will not be described in detail here.
[0062] Preferably, although not shown in the figures, the battery may further include a shell, and the cover assembly may be covered on the end of the shell in the first direction F1 to enclose and form a sealed cavity for accommodating the electrode group assembly.
[0063] Optionally, the cover plate assembly may be provided at one end of the housing in the first direction F1. Correspondingly, a plurality of poles 4 may be provided on the cover plate assembly to accommodate batteries in which the pole tabs 2 are led out from the same side of the battery.
[0064] Optionally, there may be two cover assemblies, which may be respectively provided on both ends of the housing in the first direction F1 to accommodate a battery in which the tabs 2 are led out from two opposite sides of the battery.
[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A tab connection structure, characterized in that: The invention comprises a cover plate assembly and a pole group assembly, wherein the cover plate assembly comprises a cover plate body and a pole column, the cover plate body is provided with an explosion-proof opening penetrating the cover plate body along a first direction, and the explosion-proof opening is used to set an explosion-proof valve; The pole group assembly includes a pole group body and a pole lug, the pole lug is led out from one end of the pole group body in the first direction, the pole lug is attached to the inner side of the cover plate assembly, and is electrically connected to the pole post, the first part of the pole lug is bent along a first fold line toward the second part of the pole lug, the first part of the pole lug is the part of the pole lug overlapping with the explosion-proof opening in the first direction, so that the explosion-proof opening can be exposed by the pole lug.
2. The tab connection structure according to claim 1, characterized in that: The pole and the explosion-proof opening are arranged side by side on the cover body along a second direction, and the second direction intersects the first direction; The first portion is provided at an end portion of the second portion in the second direction.
3. The tab connection structure according to claim 2, characterized in that: The tab further includes a third portion, wherein the first portion and the third portion are respectively arranged at two ends of the second portion in the second direction; The third portion of the tab is bent along a second fold line toward the second portion of the tab.
4. The tab connection structure according to claim 3, characterized in that: The tab has an axis of symmetry, and the axis of symmetry extends along the first direction; The first fold line and the second fold line are symmetrical about the symmetry axis.
5. The tab connection structure according to any one of claims 1 to 4, characterized in that: The cover plate assembly further comprises a plastic part, and the plastic part is arranged on the inner side of the cover plate body; In the first direction, a portion of the plastic part facing the explosion-proof opening is provided with a breathable mesh hole penetrating the plastic part along the first direction, and the breathable mesh hole can be exposed by the tab.
6. The tab connection structure according to claim 5, characterized in that: The pole includes a top plate, a bottom plate, and a connecting column, wherein the top plate and the bottom plate are respectively arranged on both sides of the cover plate body in the first direction, and the connecting column penetrates the cover plate body along the first direction and connects the top plate and the bottom plate; The tab is connected to the pole via the bottom plate.
7. The tab connection structure according to claim 1, characterized in that: The tab is bent along a third fold line so that the tab is parallel to the cover body, and the third fold line extends along a second direction, and the second direction intersects the first direction; The angle between the first fold line and the third fold line is an acute angle.
8. The tab connection structure according to claim 3, characterized in that: The second portion extends along the second direction, and the second portion includes a first stacked region, a single-layer region, and a second stacked region sequentially arranged along the second direction; The first stacked region is a portion of the second portion that overlaps with the first portion, and the second stacked region is a portion of the second portion that overlaps with the third portion.
9. The tab connection structure according to claim 8, characterized in that: The terminal lug and the terminal post are welded and connected according to a predetermined weld mark; The predetermined weld mark extends from the single-layer area along the second direction to the first laminated area and the second laminated area respectively.
10. A battery, characterized in that: The invention comprises the tab connection structure according to any one of claims 1 to 9.