Pin structure and battery cell assembly

Abstract

To provide a pin structure with controlled thickness while increasing the strength of the pin structure as a whole.SOLUTION: The pin structure including a tab guide portion 100 and a pole weld portion 200 connected to each other and a battery cell assembly are disclosed. The tab guide portion is installed to be connected to a tab. The pole weld portion is installed to be connected to an electrode terminal. The tab guide portion and the pole weld portion are installed at an angle. The tab guide portion includes a peer thinning regions 130 and a non-pier thinning region 120, The peer thinning regions are subjected to a peer thinning process, The peer thinning regions are installed symmetrically along the center line of the tab guide portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Embodiments of the present invention relate to the field of battery technology, and more particularly to pin structures and battery cell assemblies. [Background technology]

[0002] The battery cell structure includes a positive pin and a negative pin configured to form an electrical connection between the positive and negative tabs of the battery cell. The single pin includes a tab guide portion and a pole weld portion connected to each other, with the tab guide portion being configured to connect to the tab and the pole weld portion being configured to connect to the electrode terminal. Because the tab guide portion and the pole weld portion of the pin need to be curved to extend in different directions, the pin itself cannot be made thick. If the pin is too thin, its strength will be low and its supporting force will be insufficient. Summary of the Invention [Problem to be solved by the invention]

[0003] The technical problem solved by embodiments of the present invention is to provide a pin structure and battery cell assembly that overcomes the deficiencies of the current technology. [Means for solving the problem]

[0004] The embodiments of the present invention solve the above technical problems through the following technical solutions.

[0005] The pin structure includes a tab guide portion and a pole weld portion connected to each other, the tab guide portion being configured to connect to the tab, and the pole weld portion being configured to connect to the electrode terminal. The tab guide portion and the pole weld portion are configured at an angle. The tab guide portion includes a pier thinned region and a non-pier thinned region, the pier thinned region being subjected to a pier thinning process, and the pier thinned regions are configured symmetrically along the centerline of the tab guide portion.

[0006] In this solution, by thinning the thinned pier region, the thickness of the pin material in the thinned pier region can be reduced and the hardness of the pin material in the thinned pier region can be increased, thereby achieving the purpose of ensuring the strength of the entire pin structure while controlling the thickness of the pin structure.Furthermore, by arranging the thinned pier region symmetrically along the centerline, the strength of the entire pin structure can be increased, thereby improving the supporting force of the pin structure.

[0007] Preferably, the projection of the tab on the surface of the tab guide portion is located within the thinned region of the pier.

[0008] By locating the projection of the tab on the surface of the tab guide portion in the peer thinned region, the gap between the peer thinned region and the non-peer thinned region can be utilized to accommodate the tab, effectively reducing the size of the tab protruding from the surface of the pin structure. In this way, after connection is completed, the overall thickness of the pin structure for the connected tab is relatively thin, saving space.

[0009] Preferably, the ratio of the thickness of the pier thinned region to the thickness of the non-pier thinned region is 1 / 8 or more and less than 1 / 1.

[0010] The thickness of the thinned pier region for welding the tab on the pin structure can be controlled through a ratio parameter. As long as the basic function of the pin structure is met, the first region can effectively accommodate the tab and avoid structural strength problems caused by the thinned pier region.

[0011] Preferably, the thickness of the peer thinned regions and tabs is equal to or less than the thickness of the non-peer thinned regions.

[0012] By using the recess formed by the peer thinned region relative to the non-pier thinned region to accommodate the tab, the combined thickness of the peer thinned region and the tab is further reduced to less than or equal to the thickness of the non-pier thinned region, such that the tab does not protrude beyond the surface of the non-pier thinned region of the pin structure after completion of connection of the pin structure to the tab to be connected.

[0013] When the sum of the thickness of the pier thinned region and the thickness of the tab is equal to the thickness of the non-pier thinned region, the problem of weak overcurrent capability of the pin structure caused by the thin thickness of the pier thinned region can also be effectively avoided.

[0014] Preferably, the two tabs are bent along two opposite sides of the pin structure, respectively, and extended toward each other, after which they are welded to the surface of the tab guide portion remote from the electrode assembly.

[0015] By bending two tabs on two opposite sides of the pin structure and welding them to a surface of the tab guide portion away from the electrode assembly, the welding of the tabs to the tab guide portion is not obstructed by the electrode assembly, making the welding process easier to carry out.

[0016] Preferably, the two tabs form a relatively overlapping intersection area after being folded, and the thickness of the peer thinned area corresponding to the relatively overlapping intersection area is less than the thickness of other areas of the peer thinned area.

[0017] The peer thinned area corresponding to the relative overlapping intersection area of ​​the tabs allows the thickness of this area to be specifically reduced so that the peer thinned area can be used to accommodate the tab and prevent the overall thickness of the pin structure from increasing after being connected to the tab.

[0018] Preferably, the relatively overlapping intersection regions of the two tabs form a first step structure, and the non-overlapping regions of the two tabs form a second step structure, with a gap between the first step structure and the second step structure, and a gap structure matching the first step structure and the second step structure is formed on the surface of the peer thinned region for receiving the tabs.

[0019] Preferably, the tab guide portion includes a welding area for welding with the tab of the electrode assembly, and the peer thinned area is at least partially located within the welding area.

[0020] By providing a weld that connects the tab to the thinned pier region by welding and utilizing the thinned pier region to accommodate the tab, the current problem of an increase in overall thickness due to the accommodation of an excessively long tab can be effectively overcome.

[0021] Preferably, weld marks are distributed on the surface of the welding portion, and the tab guide portion is connected to the tab via the weld marks.

[0022] Preferably, the projection of the tab in the weld area is located within the pier thinned area.

[0023] In this solution, by setting the pier thinned area at the weld, the tab can rationally utilize the space of the pier thinned area, thereby reducing the use of external space, and thus rational utilization of space can be achieved.

[0024] Preferably, the ratio of the thickness of the welded area to the thickness of the non-pier thinned area is greater than or equal to 1 / 8 and less than 1 / 1.

[0025] The thickness of the welded area of ​​the tab welded onto the pin structure can be controlled through a ratio parameter. As long as the basic function of the pin structure is met, the first area can effectively accommodate the tab and avoid structural strength problems caused by a thin welded area.

[0026] Preferably, the thickness of the weld area and tab is equal to or less than the thickness of the non-pier thinned area.

[0027] In this solution, the tab can utilize the thinned pier area in a reasonable way without occupying additional external space, further improving space utilization. For the solution where the sum of the thickness of the weld and the tab is equal to the thickness of the non-thinned pier area, the problem of weak overcurrent capability caused by the thin pin structure of the weld can be effectively prevented, provided that the weld area within the thinned pier area can accommodate the tab.

[0028] Preferably, as the thickness of the weld tab increases, the thickness of the weld decreases.

[0029] In situations where the thickness of the welded tab varies (for example, when different parts of a single tab have different thicknesses, or when multiple tabs of different lengths overlap each other, resulting in different overall tab thicknesses), the thickness of the welded area can be reduced as the tab thickness increases, specifically to thin the thicker parts of the tab, on the premise of ensuring the overall thickness of the thinned pier area in the welded area. In this way, the overall thickness can be prevented from becoming too thick after the tab is welded.

[0030] Preferably, the welded areas are symmetrically distributed on both sides of the non-pier thinned area.

[0031] In this solution, the tabs may be connected to the welding area from both sides to facilitate welding of the tabs.

[0032] Preferably, the tab extends from the electrode assembly, the pier thinned region is located on a surface of the tab guide portion remote from the electrode assembly, and the tab is welded to the tab guide portion at the pier thinned region.

[0033] Preferably, the tab extends from the electrode assembly, the pier thinned region is located on a surface of the tab guide portion facing the electrode assembly, and the tab is welded to the tab guide portion at the pier thinned region.

[0034] By welding the tab to a surface of the pin structure remote from the electrode assembly, the welding process is not impeded by the electrode assembly, making it easier to perform the welding process.

[0035] Preferably, the hardness of the material in the pier thinned regions is greater than the hardness of the material in the non-pier thinned regions.

[0036] By increasing the hardness of the material in the thinned pier region, which has a relatively thin plate thickness, the strength of the entire pin structure can be effectively strengthened, making it possible to achieve both strength and light weight for the pin structure.

[0037] The housing and an electrode assembly disposed within the housing and including an electrode assembly body and a tab extending from the electrode assembly body; an upper cover assembly including an upper cover body and an electrode terminal disposed on the upper cover body, the upper cover body being connected to the housing; a pin structure; a battery cell assembly in which the tab guide portion of the pin structure is connected to the tab, and the pole welding portion of the pin structure is connected to the electrode terminal.

[0038] This solution improves the strength of the pin structure, provides better support, and makes the pin structure less susceptible to damage, thereby improving the stability and service life of the battery cell assembly using the above-mentioned pin structure.

[0039] Preferably, the tab is welded to a pier thinned area on the surface of the tab guide portion remote from the electrode assembly.

[0040] Such structural placement exposes the welding area and facilitates the welding process of the tab and pin structure.

[0041] Preferably, the number of tabs protruding from the electrode assembly is two. After the two tabs are bent along two opposite sides of the pin structure, respectively, and extended toward each other, they are welded to the peer thinned region on the surface of the tab guide part remote from the electrode assembly, so that the projection of the tab on the surface of the pin structure is completely located within the peer thinned region.

[0042] To avoid excessive thickness after the pin structure and tab are welded together, a pier thinned area is provided to accommodate the tab.

[0043] Preferably, the two tabs form a relatively overlapping intersection area after being folded, and the thickness of the peer thinned area corresponding to the relatively overlapping intersection area is less than the thickness of other areas of the peer thinned area.

[0044] Certain areas of the peer thinned region corresponding to the relative overlapping intersection areas of the tabs are thinned to use the peer thinned region to accommodate the tabs, ensuring the overall strength of the pin structure while also considering overcurrent capability.

[0045] The advantageous effects of the embodiments of the present invention are as follows: [Effects of the Invention]

[0046] In this solution, the thickness of the pin material in the thinned peer region is reduced by thinning the thinned peer region, and the hardness of the pin material in the thinned peer region is increased, thereby ensuring the strength of the entire pin structure while controlling the thickness of the pin structure. Furthermore, the thinned peer region is set symmetrically along the centerline, which further improves the strength of the entire pin structure and increases the supporting force of the pin structure. [Brief explanation of the drawings]

[0047] [Figure 1] 1 is a schematic view showing a pin structure according to a first embodiment of the present invention. [Figure 2] FIG. 4 is a schematic view showing a pin structure according to a second embodiment of the present invention. [Figure 3] FIG. 10 is a schematic configuration diagram showing a tab guide portion of a pin structure according to a second embodiment of the present invention. [Figure 4] FIG. 4 is a schematic side view of a pin structure according to a second embodiment of the present invention. [Figure 5] 5 is an enlarged structural view showing position B in the embodiment of FIG. 4 of the present invention. [Figure 6] 5 is an enlarged structural view showing position C in the embodiment of FIG. 4 of the present invention. [Figure 7]FIG. 10 is a schematic diagram (1) showing the positional relationship between a pin structure, an electrode assembly, and an upper cover assembly in a third embodiment of the present invention. [Figure 8] FIG. 10 is a schematic diagram (2) showing the positional relationship between the pin structure, the electrode assembly, and the upper cover assembly in the third embodiment of the present invention. [Figure 9] FIG. 10 is a schematic diagram (1) showing the positional relationship between a pin structure and an upper cover assembly in a third embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram (2) showing the positional relationship between the pin structure and the upper cover assembly in the third embodiment of the present invention. [Figure 11A] FIG. 10 is a schematic diagram (1) showing the thickness relationship between the pier thinned region and the non-pier thinned region of the pin structure according to the third embodiment of the present invention. [Figure 11B] FIG. 10 is a schematic diagram (2) showing the relationship between the thickness of the pier thinned region and the thickness of the non-pier thinned region of the pin structure in the third embodiment of the present invention. [Figure 12] FIG. 10 is a schematic structural diagram of an electrode assembly in a tab according to a fourth embodiment of the present invention. [Figure 13] FIG. 10 is a schematic configuration diagram of a pin structure according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0048] The following are preferred embodiments, which are provided in conjunction with the accompanying drawings to more clearly and completely explain the embodiments of the present invention.

[0049] First embodiment

[0050] As shown in FIG. 1 , the present invention provides a pin structure including a tab guide portion 100. The tab guide portion 100 includes a peer thinned region 130 and a non-peer thinned region 120. The peer thinned region 130 is subjected to a peer thinning process and is disposed symmetrically along the centerline of the tab guide portion. Thinning the peer thinned region 130 allows for compression of the peer thinned region 130. Increasing the density of the peer thinned region 130 enhances the strength of the peer thinned region 130. Furthermore, by disposing the peer thinned region 130 symmetrically along the centerline, the strength of the entire pin structure can be increased, thereby improving the support capacity of the pin structure.

[0051] In this embodiment, the tab guide portion 100 includes a welding area 110 for welding to the tab of the battery cell, and the peer thinned area 130 is located within the welding area 110. By locating the peer thinned area 130 within the welding area 110, the tab can rationally utilize the space of the peer thinned area 130, thereby reducing the use of external space. In this way, rational use of space can be achieved.

[0052] Specifically, the projection of the tab in the welding area 110 is located within the pier thinned area 130. The tab can be completely installed within the pier thinned area 130, which makes the space utilization more reasonable and further improves the space utilization rate.

[0053] In this embodiment, the thickness of the welded region 110 and the tab is less than the thickness of the non-pier thinned region 120. The tab can rationally utilize the space of the pier thinned region 130 to further improve space utilization without occupying additional external space.

[0054] In other embodiments, the thickness of the weld area 110 and tabs may be equal to the thickness of the non-pier thinned area 120 .

[0055] In this embodiment, the welding regions 110 are symmetrically distributed on both sides of the non-pier thinned region 120. The front and rear ends and the middle region of the tab guide portion 100 are non-pier thinned regions. The welding regions 110 are distributed on both sides of the central non-pier thinned region 120 and are enclosed by the non-pier thinned region at the front and rear ends. Tabs can be connected to the welding regions 110 from both sides, which makes it easy to weld the tabs.

[0056] Of course, in other embodiments, the non-pier thinned regions 120 may be located only in the central region of the tab guide portion 100, and the peer thinned regions 130 may be located on either side of the non-pier thinned regions 120.

[0057] Specifically, in this embodiment, the weld area 110 coincides with the peer thinned area 130 so that the tab is located entirely within the peer thinned area 130 .

[0058] Of course, in other embodiments, the projection of the tab on the weld area 110 may be located partially within the peer thinned area 130. That is, the peer thinned area 130 may be smaller than the weld area 110.

[0059] In this embodiment, the pin structure further includes a pole weld 200, and the pole weld 200 and the tab guide 100 form an arc transition portion 300. By providing the arc transition portion 300 between the pole weld 200 and the tab guide 100, stress concentration can be prevented.

[0060] In this embodiment, the thickness of the peer thinned region 130 is equal to or less than the thickness of the non-peer thinned region 120, and the density of the peer thinned region 130 is greater than the density of the non-peer thinned region 120. The thickness of the peer thinned region 130 is less than the thickness of the non-peer thinned region 120. In this way, the space of the tab can be saved and the space utilization rate can be effectively improved. The density of the peer thinned region 130 is greater than the density of the non-peer thinned region 120, which improves the strength of the peer thinned region 130.

[0061] The present embodiment further provides a battery cell assembly including: a housing; an electrode assembly installed in the housing and including an electrode assembly body and a tab extending from the electrode assembly body; an upper cover assembly including an upper cover body and an electrode terminal installed on the upper cover body, wherein the upper cover body is connected to the housing; and the above-mentioned pin structure.

[0062] The strength of the pin structure is improved, the pin structure has better supporting force, and the pin structure is less susceptible to damage. The stability and service life of the battery cell assembly using the above-mentioned pin structure are improved.

[0063] Second embodiment

[0064] The solution of this embodiment is basically the same as the solution of the first embodiment, except for the following points.

[0065] 2 to 6, in this embodiment, the peer thinned region 130 is provided on the outer periphery of the tab guide portion 100. The peer thinned region 130 is located on the outer periphery of the tab guide portion 100. By significantly improving the strength of the outer periphery of the tab guide portion 100, the strength of the pin structure is strengthened, and the supporting force of the pin structure is improved.

[0066] 2 and 3, in this embodiment, the peer thinned region 130 is further disposed in the central region of the tab guide portion 100 and extends along the centerline to the outer periphery of the tab guide portion 100. By disposing the peer thinned region 130 in the central region and extending to the outer periphery of the tab guide portion 100, the strength of the middle region of the tab guide portion 100 is improved. Together with the outer periphery peer thinned region 130, this helps to further improve the strength of the pin structure.

[0067] Of course, in other embodiments, the middle region of the tab guide portion 100 may not have the thinned pier region 130 .

[0068] 2, 4, and 6, in this embodiment, the tab guide part 100 has a peer thinned region 130 located near the arc transition part 300. By providing the peer thinned region 130 at a position on the tab guide part 100 close to the arc transition part 300, the strength of the tab guide part 100 at a position close to the arc transition part 300 is increased, and the tab guide part 100 is less likely to deform relative to the pole weld part 200.

[0069] Third embodiment

[0070] As shown in FIG. 7, it is a specific structural schematic diagram showing the battery cell assembly provided in the first embodiment, showing the specific positional relationship and installation of the pin structure, electrode assembly 400 and upper cover assembly 500, and the pin structure can adopt the pin structure provided in the first embodiment or the second embodiment.

[0071] Specifically, the electrode assembly 400 includes an electrode assembly body and a tab 401 extending from the electrode assembly body, and the upper cover assembly 500 includes an upper cover body and an electrode terminal 501 installed on the upper cover body. The tab guide portion 100 of the pin structure provided in the first or second embodiment is connected to the tab 401, and the electrode welding portion 200 is connected to the electrode terminal 501.

[0072] Specifically, the tab guide portion 100 and the pole welding portion 200 provided in the first or second embodiment are disposed at a 90° angle, thereby achieving the purpose of directly transmitting power between the tab 401 and the electrode terminal 501. Of course, in other embodiments, the tab guide portion 100 and the pole welding portion 200 may be bent at other angles to achieve the same purpose of transmitting power.

[0073] This embodiment takes the pin structure provided in the first embodiment as an example to specifically describe how the pin structure provided in the first embodiment is connected to the tab of the electrode assembly 400 via the peer thinned region 130 of the pin structure. In the pin structure of the first embodiment, the peer thinned region 130 is located within the welding region 110, that is, the entire welding region 110 to which the tab 401 is welded belongs to the relatively thinned range of the peer thinned region 130, making the entire thickness of the welding region relatively thin. After the tab 401 is welded to the welding region 110, the relatively thinned region can be used to accommodate the tab 401.

[0074] As specifically shown in FIG. 8 , the pier thinned regions 130 of the tab guide portion 100 of the pin structure are thinner than the non-pier thinned regions 120, and the pier thinned regions 130 are disposed symmetrically along the center line 100a of the tab guide portion 100. By thinning the pier thinned regions 130, the thickness of the pin material in the pier thinned regions 130 can be reduced, and the hardness of the pin material in the pier thinned regions 130 can be improved, thereby ensuring the strength of the entire pin structure while controlling the thickness of the pin structure. Furthermore, by disposing the pier thinned regions 130 symmetrically along the center line 100a, the strength of the entire pin structure can be increased, thereby improving the supporting force of the pin structure.

[0075] When the pin structure is processed through a pier thinning process including a cold heading process to form the pier thinned region 130, the hardness of the material in the pier thinned region 130 may be greater than the hardness of the material in the non-pier thinned region 120. In this way, by increasing the hardness of the material in this region, the strength of the entire pin structure can be effectively strengthened, and the pin structure can be made both strong and lightweight.

[0076] As can be seen from FIG. 7 , the electrode assembly 400 has two tabs 401 that need to be welded to a single pin structure. The two tabs 401 protrude from both sides of the pin structure and are bent on two opposing sides of the pin structure, respectively. After the two tabs 401 extend toward each other, they are welded 130 to the peer thinned regions on the surface of the tab guide portion 100 that is farther from the electrode assembly 400. In the first embodiment, the two peer thinned regions 130 provided by the tab guide portion 100 of the pin structure precisely correspond to the two curved tabs 401, so that the projections of the curved tabs 401 on the surface of the pin structure are completely located within the peer thinned regions 130. By utilizing the gap between the peer thinned regions 130 and the non-pier thinned regions 120 to accommodate the tabs 401, the dimension of the tabs 401 protruding from the surface of the pin structure can be effectively reduced, so that the overall thickness of the pin structure with the connected tabs 401 is relatively thin after the connection is completed.

[0077] As shown in FIGS. 9 and 10 , the tab 401 is relatively welded via a welding region 110 in the peer thinning region 130. Weld marks 111 are distributed on the surface of the welding region 110, and the tab guide portion 100 and the tab 401 are connected via the welding marks 111. In this embodiment, as can be seen from FIGS. 7 and 8 , only one welding mark 111 is provided in the single welding region 110 to which the tab 401 is welded, and the welding mark 111 extends in the vertical direction. Of course, in other embodiments, multiple welding marks 111 that are relatively parallel to each other and uniformly distributed within the welding region 110 may be provided. By uniformly distributing multiple welding marks 111 to achieve welding and connection with the tab 401, the connection strength can be improved.

[0078] The pin structure used in this embodiment is derived from the pin structure provided in the first embodiment, so that the thickness of the welded region 110 of the pin structure and tab (i.e., the sum of the thickness of the welded region 110 and the tab) is less than the thickness of the non-pier thinned region 120, so that the tab can be completely accommodated.

[0079] Based on the thickness relationships provided in the first embodiment, a preferred dimensional relationship between the thickness of the peer thinned region 130 having the weld region 110, the thickness of the non-pier thinned region 120, and the thickness of the tab will now be further described. Referring to FIGS. 11A and 11B, which show the thickness S1 of the peer thinned region 130 and the thickness S2 of the non-pier thinned region 120 of the pin structure. First, to ensure that the tab is partially accommodated, the thickness S1 of the peer thinned region 130 is less than the thickness S2 of the non-pier thinned region 120 to form an inward recess in the peer thinned region 130. Furthermore, by welding the tab 401 at the weld region 110 within the pier thinned region 130 to accommodate the tab 401 using the formed recess, the overall thickness of the pin structure of the connected tab 401 can be made relatively thin after welding and connection are completed.

[0080] Additionally, the thickness S1 of the peer thinned region 130 plus the thickness of the tab 401 must be less than or equal to the thickness S2 of the non-pier thinned region 120 so that after using the recess formed by the peer thinned region 130 relative to the non-pier thinned region 120 to accommodate the tab 401, the sum of the thicknesses of the peer thinned region 130 and the tab 401 is less than or equal to the thickness of the non-pier thinned region 120. In this way, after connection of the pin structure to the connecting tab 401 is complete, the tab 401 does not protrude beyond the surface of the non-pier thinned region 120 of the pin structure.

[0081] A solution in which the thickness S1 of the peer thinned region 130 plus the thickness of the tab 401 is equal to the thickness S2 of the non-pier thinned region 120 is relatively good, because this structural configuration can not only control the overall thickness but also effectively prevent the pin structure from having a weak overcurrent capability due to the thin thickness of the peer thinned region 130.

[0082] In this embodiment, the thickness of the tab 401 does not change in the extension direction, and therefore the thickness of the peer thinned region 130 does not change either. However, in other embodiments, when the tab 401 has a multi-layer structure or the like and the thickness of the tab 401 changes in the extension direction, for example, when the thickness gradually becomes thinner or thicker, it is preferable that the thickness S1 of the peer thinned region 130 also gradually becomes thinner or thicker in accordance with the change in the thickness of the tab 401 in order to completely accommodate the tab 401 and prevent the tab 401 from protruding from the surface of the pin structure.

[0083] The ratio between the thickness S1 of the pier thinned region 130 and the thickness S2 of the non-pier thinned region 120 is preferably controlled to be greater than or equal to 1 / 8 and less than 1. In the pin structure, the ratio parameter is provided to control the thickness of the pier thinned region 130, which includes the welding region 110 of the welded tab 401. Therefore, there is a ratio between the thickness of the pier thinned region 130 and the thickness of the non-pier thinned region 120. Assuming that the basic function of the pin structure is fulfilled, it is necessary to further standardize the pier thinning design criteria to avoid structural strength problems caused by the thinning of the welding region 110. By controlling the lower limit of the ratio between the thickness of the pier thinned region 130 and the thickness of the non-pier thinned region 120 to 1 / 8, it is possible to effectively prevent the welding region 110 from being insufficient for welding the tab 401, thereby preventing the risks of insufficient overcurrent capacity and insufficient strength of the weld mark 111.

[0084] In this embodiment, the pin structure provided in the first embodiment is employed, so that the peer thinned region 130 is located on the surface of the tab guide portion 100 remote from the electrode assembly 400. Therefore, in this configuration, after the tab 401 is led out of the electrode assembly 400, the tab 401 is bent at the surface of the tab guide portion 100 remote from the electrode assembly 400 and welded to the pin structure.

[0085] Of course, in other embodiments, the peer thinned region 130 of the pin structure may also be located on the surface of the tab guide section 100 that faces the electrode assembly 400. In such a configuration, after the tab 401 is led out of the electrode assembly 400, the tab 401 is bent onto the surface of the electrode assembly 400 of the tab guide section 100 and welded to the pin structure. That is, regardless of which surface of the pin structure the peer thinned region 130 is located on, a relatively preferred solution is to bend and weld the pin within the peer thinned region 130 on the surface and utilize the recess formed by the peer thinned region 130 to accommodate the tab 401.

[0086] Furthermore, although the pin structure provided in the first embodiment is employed in this embodiment, the pin structure provided in the second embodiment may also be employed in other cases. In the second embodiment, the thinned pier region 130 formed on the surface of the pin structure is utilized to accommodate the tab 401 protruding from the electrode assembly 400, preventing the tab 401 from protruding from the surface of the pin structure.

[0087] Fourth embodiment

[0088] This embodiment also provides a pin structure and a battery cell assembly including the same. The pin structure and the battery cell assembly are substantially the same as those provided in the first, second, or third embodiment. The main difference is that in this embodiment, as shown in FIG. 12 , two tabs 401 are bent along two opposite sides of the pin structure. Because the two tabs 401 are relatively long, they have a relatively overlapping intersection region D after bending, resulting in a discrepancy in thickness between the tabs 401 and an increased overall thickness in the intersection region D. To accommodate this type of tab 401, the thickness of the pin structure in the peer thinned region 130 corresponding to the intersection region D is less than the thickness of the other regions of the peer thinned region 130, as shown in FIG. 13 . By reducing the thickness of the overlapping intersection region of the peer thinned region 130 of the pin structure specifically relative to the tab 401, the peer thinned region 130 can be utilized to accommodate the tab 401, preventing an increase in the overall thickness of the pin structure after the tab 401 is connected.

[0089] Specifically, in this embodiment, as shown in FIG. 12 , a first step structure is formed by the overlapping intersection region D of two tabs 401, and a second step structure is formed by the non-overlapping region. A gap E exists between the first step structure and the second step structure. As shown in FIG. 13 , the pin structure is formed with a surface for accommodating the tabs 401 in the peer thinned region 130, and a gap structure F is formed on the surface to match the first step structure and the second step structure. The gap structure F is used to accommodate tabs 401 of different thicknesses. At the same time, the gap structure F can ensure that the overall thickness of the peer thinned region 130 is not so thin that it affects the strength of the entire pin structure.

[0090] Although specific implementations of the embodiments of the present invention have been described above, those skilled in the art should understand that these are merely examples, and the protection scope of the embodiments of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the embodiments of the present invention, and all of these changes and modifications will fall within the protection scope of the embodiments of the present invention. [Industrial Applicability]

[0091] The pin structure and battery cell assembly of the present invention can be applied to the manufacture of pin structures. [Explanation of symbols]

[0092] 100: Tab guide part 100a: Centerline 110: Welding area 111: Weld marks 120: Non-peer thinned area 130: Peer thinning area 200: Pole weld 300: Arc transition 400: Electrode assembly 401: Tab 500: Top cover assembly 501: Electrode terminal S1: Thickness S2: Thickness D: Intersection area E: Gap F: Gap structure

Claims

1. the tab guide portion and the pole weld portion are connected to each other, the tab guide portion is arranged to be connected to a tab, the pole weld portion is arranged to be connected to an electrode terminal, the tab guide portion and the pole weld portion are arranged at an angle, the tab guide portion includes a pier thinned region and a non-pier thinned region, the pier thinned region is subjected to a pier thinning process, and the pier thinned regions are arranged symmetrically along a center line of the tab guide portion, the hardness of the material of the pier-thinned region is greater than the hardness of the material of the non-pier-thinned region; Pin structure.

2. a projection of the tab on the surface of the tab guide portion is located within the thinned pier region; The pin structure according to claim 1 .

3. a ratio of the thickness of the pier thinned region to the thickness of the non-pier thinned region is greater than or equal to 1 / 8 and less than 1; The pin structure according to claim 2 .

4. a thickness of the pier thinned region and a thickness of the tab are less than or equal to a thickness of the non-pier thinned region; The pin structure according to claim 2 .

5. the two tabs are bent along two opposite sides of the pin structure, respectively, and extended toward each other, and then the two tabs are welded to a surface of the tab guide portion remote from the electrode assembly; The pin structure according to claim 4 .

6. the two tabs form a relatively overlapping intersection area after being folded, and the thickness of the peer thinned area corresponding to the relatively overlapping intersection area is less than the thickness of the other area of ​​the peer thinned area; The pin structure according to claim 5 .

7. a first step structure is formed by the relatively overlapping intersection regions of the two tabs, a second step structure is formed by the non-overlapping regions of the two tabs, there is a gap between the first step structure and the second step structure, and a gap structure that matches the first step structure and the second step structure is formed on a surface of the peer thinned region for accommodating the tabs; The pin structure according to claim 6.

8. the tab guide portion includes a welding area for welding with a tab of an electrode assembly, and the peer thinned area is at least partially located within the welding area. The pin structure according to claim 1 .

9. Welding marks are distributed on a surface of the welding region, and the tab guide portion is connected to the tab via the welding marks. The pin structure according to claim 8.

10. The projection of the tab in the welding area is located within the pier thinned area. The pin structure according to claim 9.

11. a ratio of the thickness of the welded region to the thickness of the non-pier thinned region is equal to or greater than 1 / 8 and less than 1; The pin structure according to claim 10.

12. the thickness of the welded region and the thickness of the tab are less than or equal to the thickness of the non-pier thinned region; The pin structure according to claim 8.

13. As the thickness of the welded tab increases, the thickness of the welded area decreases. The pin structure according to claim 12.

14. the welded areas are symmetrically distributed on both sides of the non-pier thinned area; The pin structure according to claim 8.

15. the tab extends from the electrode assembly, the peer thinned region is located on a surface of the tab guide portion away from the electrode assembly, and the tab is welded to the tab guide portion at the peer thinned region. The pin structure according to claim 1 .

16. the tab extends from the electrode assembly, the peer thinned region is located on a surface of the tab guide portion facing the electrode assembly, and the tab is welded to the tab guide portion at the peer thinned region. The pin structure according to claim 1 .

17. The housing and an electrode assembly disposed within the housing, the electrode assembly including an electrode assembly body and a tab extending from the electrode assembly body; an upper cover assembly including an upper cover body and an electrode terminal installed on the upper cover body, the upper cover body being connected to the housing; The pin structure according to any one of claims 1 to 16, Including, The tab guide portion of the pin structure is connected to the tab, a battery cell assembly in which the pole weld portion of the pin structure is connected to the electrode terminal;

18. the tab is welded to the pier thinned area on the surface of the tab guide portion remote from the electrode assembly; 18. The battery cell assembly of claim 17.

19. The number of tabs protruding from the electrode assembly is two; after the two tabs are respectively bent along two opposite sides of the pin structure and extended toward each other, the two tabs are welded to the peer thinned area on the surface of the tab guide part away from the electrode assembly, and the projection of the tabs on the surface of the pin structure is completely located within the peer thinned area; the two tabs form a relatively overlapping intersection area after being folded, and the thickness of the peer thinned area corresponding to the relatively overlapping intersection area is less than the thickness of other areas of the peer thinned area; 18. The battery cell assembly of claim 17.

Images