Coil core structure for bipolar lug semi-solid cylindrical lithium battery and bipolar lug semi-solid cylindrical lithium battery

Abstract

The present disclosure provides a winding core structure for bipolar tab semi-solid cylindrical lithium battery and a bipolar tab semi-solid cylindrical lithium battery. The winding core structure comprises a winding core and a negative electrode insulation sheet. The negative electrode tab of the winding core comprises a first electrode tab and a second electrode tab. A welding hole is formed in the center of the negative electrode insulation sheet. A through slot is formed in the negative electrode insulation sheet. The through slot is matched with the second electrode tab. The second electrode tab passes through the through slot and is at least partially exposed. The length of the first electrode tab is greater than the maximum value of the distance between the first electrode tab and the outer periphery of the welding hole. The length of the exposed second electrode tab is greater than the maximum value of the distance between the first electrode tab and the outer periphery of the welding hole. The winding core structure can completely shield the welding hole after the first electrode tab and the second electrode tab are bent. The flatness of the bent second electrode tab is ensured, and the problem of short circuit caused by the exposure of the winding core is avoided.

Description

Technical Field

[0001] This disclosure relates to the field of bipolar semi-solid cylindrical lithium battery technology, and in particular to a core structure for a bipolar semi-solid cylindrical lithium battery and a bipolar semi-solid cylindrical lithium battery. Background Technology

[0002] Generally, bipolar semi-solid cylindrical lithium batteries require a negative electrode insulating sheet to be placed between the negative electrode of the core and the steel shell. This insulating sheet can effectively isolate the negative electrode of the core from the steel shell, thus preventing short circuits in the bipolar semi-solid cylindrical lithium battery.

[0003] Since the positive and negative electrodes of the bipolar semi-solid cylindrical lithium battery use the first and second tabs, in order to better balance the electrical performance of the bipolar semi-solid cylindrical lithium battery, most scholars will place the first tab of the negative electrode on the outermost ring of the core and the second tab on the center hole of the core. In this way, not only is the current distribution of the bipolar semi-solid cylindrical lithium battery uniform, but also the structure of the matching negative electrode insulating sheet is relatively simple, that is, only one through hole needs to be opened in the center hole of the negative electrode insulating sheet.

[0004] In practical applications, the operator first needs to pass the second tab of the negative electrode of the core through the through hole of the negative electrode insulation sheet, and then bend the first and second tabs respectively so that the first and second tabs can overlap at the through hole to form the negative tab of the core. Then, the core is placed into the steel shell, and finally the welding needle is inserted into the through hole from the center hole of the core to complete the welding and fixing of the negative tab of the core to the steel shell.

[0005] To facilitate quick installation of the second tab, the diameter of the through hole is generally required to be greater than the diameter of the second tab. However, in practical applications, the diameter of the center hole of the core is usually smaller than the diameter of the second tab, as in the insulating sheet of the cylindrical lithium battery disclosed in Chinese application No. 201521075609.1. This results in the first and second tabs overlapping after bending not completely covering the through hole, i.e., there is a blank area between the through hole and the bent negative tab, causing a small portion of the core to be exposed. The exposed core increases the probability of a short circuit with the steel shell. Utility Model Content

[0006] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a core structure for a bipolar semi-solid cylindrical lithium battery that ensures the flatness of the second tab bend and avoids the problem of short circuit caused by exposed core.

[0007] The purpose of this disclosure is achieved through the following technical solution:

[0008] A bipolar semi-solid cylindrical lithium battery core structure includes a core and a negative electrode insulating sheet. The negative electrode tab of the core includes a first tab and a second tab. The first tab is located on the outermost ring of the core, and the second tab is disposed adjacent to the center hole of the core. The negative electrode insulating sheet has a welding hole formed through it corresponding to the center hole.

[0009] The negative electrode insulating sheet also has a through groove, which is offset from the welding hole. The through groove is adapted to the second electrode tab, which passes through the through groove and is at least partially exposed. The width of the first electrode tab and the width of the second electrode tab are both greater than the diameter of the welding hole. The length of the first electrode tab is greater than the maximum value of the distance between the first electrode tab and the outer periphery of the welding hole. The length of the exposed second electrode tab is greater than the maximum value of the distance between the second electrode tab and the outer periphery of the welding hole.

[0010] In one embodiment, the core structure further includes an insulating plug, and the negative electrode insulating sheet is further formed with an adjustment groove. The adjustment groove extends along the length direction of the through groove and communicates with the through groove. The insulating plug is embedded in the adjustment groove and is used to limit and fix the second electrode tab.

[0011] In one embodiment, there are two insulating plugs, namely a first insulating plug and a second insulating plug, and there are two adjusting grooves, namely a first adjusting groove and a second adjusting groove. The first adjusting groove and the second adjusting groove are respectively connected and disposed on both sides of the through groove. The first insulating plug is embedded in the first adjusting groove and the second insulating plug is embedded in the second adjusting groove.

[0012] In one embodiment, the thickness of the insulating plug is equal to the thickness of the negative electrode insulating sheet; and / or,

[0013] The ratio of the length of the movable groove formed by the first adjustment groove, the second adjustment groove, and the through groove to the diameter of the negative electrode insulating sheet is (0.2-0.6):1.

[0014] In one embodiment, the distance between the through-groove and the welding hole is 0.01mm-10.0mm; and / or,

[0015] The diameter of the welding hole is not less than the diameter of the center hole of the core.

[0016] In one embodiment, the through-slot is rectangular.

[0017] In one embodiment, the welding hole is circular or square.

[0018] In one embodiment, the center point of the through slot and the center point of the center hole are on the same straight line.

[0019] In one embodiment, the ratio of the diameter of the welding hole to the width of the first electrode tab, the width of the second electrode tab, and the diameter of the center hole is 1:(1.01-1.5):(1.01-1.5):(0.1-0.3).

[0020] A bipolar semi-solid cylindrical lithium battery includes the core structure for a bipolar semi-solid cylindrical lithium battery as described in any of the above embodiments.

[0021] Compared with the prior art, this disclosure has at least the following advantages:

[0022] Because the through-slot is adapted to the second electrode lug, the second electrode lug passes through the through-slot and is at least partially exposed, allowing the operator to complete the through-slot operation of the core. Furthermore, because the through-slot and the welding hole are staggered, i.e., both the welding hole and the through-slot are set separately, the sidewall of the separately set welding hole can provide better structural support for the second electrode lug during the bending operation, ensuring that the second electrode lug is less prone to wrinkles and other quality problems during the bending process, thereby effectively ensuring the flatness of the bent part of the second electrode lug, which is beneficial to subsequent welding.

[0023] Since the width of the first electrode lug and the width of the second electrode lug are both greater than the diameter of the welding hole, the length of the first electrode lug is greater than the maximum distance between the first electrode lug and the outer periphery of the welding hole, and the length of the exposed second electrode lug is greater than the maximum distance between the second electrode lug and the outer periphery of the welding hole, it is ensured that the first and second electrode lugs can completely cover the welding hole after bending, effectively avoiding the problem of exposed core, thereby reducing the probability of short circuit between the core and the steel shell. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the core structure of an embodiment of this utility model in one direction;

[0026] Figure 2 This is a schematic diagram of the negative electrode insulating sheet in one direction according to an embodiment of the present invention;

[0027] Figure 3This is a cross-sectional view of the connection between the negative electrode insulating sheet and the insulating plug in another embodiment of the present invention.

[0028] Figure 4 for Figure 3 A magnified view of the area shown at point A in the middle.

[0029] Reference numerals: 10, core structure; 100, core; 110, first tab; 120, second tab; 130, center hole; 200, negative electrode insulating sheet; 210, welding hole; 220, through slot; 310, first insulating plug; 320, first adjusting slot. Detailed Implementation

[0030] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0034] Please see Figures 1 to 2An embodiment of a bipolar semi-solid cylindrical lithium battery core structure 10 includes a core 100 and a negative electrode insulating sheet 200. The negative electrode tabs of the core 100 include a first tab 110 and a second tab 120. The first tab 110 is located on the outermost ring of the core 100, and the second tab 120 is disposed adjacent to the center hole 130 of the core 100. This ensures that the first tab 110 and the second tab 120 are evenly distributed at the ends of the core 100, thereby ensuring a uniform current distribution in the bipolar semi-solid cylindrical lithium battery. The negative electrode insulating sheet 200 has a welding hole 210 formed through it at the position corresponding to the center hole 130, which facilitates the rapid passage of the welding needle through the center hole 130 and the welding hole 210 to complete the negative electrode. The ear is welded and fixed to the steel shell; the negative electrode insulating sheet 200 is also formed with a through groove 220, the through groove 220 is staggered from the welding hole 210, the through groove 220 is adapted to the second electrode ear 120, the second electrode ear 120 passes through the through groove 220 and is at least partially exposed, the width of the first electrode ear 110 and the width of the second electrode ear 120 are both greater than the diameter of the welding hole 210, the length of the first electrode ear 110 is greater than the maximum value of the distance between the outer periphery of the outline of the first electrode ear 110 and the outline of the welding hole 210, and the length of the exposed second electrode ear 120 is greater than the maximum value of the distance between the outer periphery of the outline of the second electrode ear 120 and the outline of the welding hole 210.

[0035] It is understood that, since the through-slot 220 is adapted to the second electrode tab 120, the second electrode tab 120 passes through the through-slot 220 and is at least partially exposed, so that the operator can complete the through-slot operation of the electrode tab of the core 100; and since the through-slot 220 and the welding hole 210 are staggered, that is, the welding hole 210 and the through-slot 220 are both set separately, and the sidewall of the separately set welding hole 210 can provide better structural support for the second electrode tab 120 during the bending operation, so as to ensure that the second electrode tab 120 is not prone to wrinkles or other quality problems during the bending process, thereby effectively ensuring the flatness of the bending part of the second electrode tab 120, which is beneficial to subsequent welding.

[0036] It can also be understood that, since the width W1 of the first electrode tab 110 and the width W2 of the second electrode tab 120 are both greater than the diameter D of the welding hole 210, the length L1 of the first electrode tab 110 is greater than the maximum value L2 of the distance between the first electrode tab 110 and the outer periphery of the welding hole 210, and the exposed length L3 of the second electrode tab 120 is greater than the maximum value L4 of the distance between the second electrode tab 120 and the outer periphery of the welding hole 210, please refer to [link / reference]. Figure 1 and Figure 2As shown, this ensures that the first tab 110 and the second tab 120 after bending can completely cover the welding hole 210, effectively avoiding the problem of the core 100 being exposed, thereby reducing the probability of the core 100 and the steel shell short-circuiting.

[0037] In one embodiment, the core structure 10 further includes an insulating plug, and the negative electrode insulating sheet 200 is also formed with an adjustment groove. The adjustment groove extends along the length of the insertion groove 220 and communicates with the insertion groove 220. The added adjustment groove not only facilitates the operator in inserting the second electrode tab 120, but also helps the operator adjust the position of the second electrode tab 120. Since the insulating plug is embedded in the adjustment groove, the insulating plug is used to limit and fix the second electrode tab 120, effectively avoiding the problem of the second electrode tab 120 easily becoming loose due to the adjustment groove.

[0038] In one embodiment, the insulating plug is adapted to the adjustment groove to ensure that the insulating plug can be embedded in the adjustment groove.

[0039] like Figure 3 and Figure 4 As shown, in one embodiment, there are two insulating plugs, namely a first insulating plug 310 and a second insulating plug, and there are two adjusting grooves, namely a first adjusting groove 320 and a second adjusting groove. The first adjusting groove 320 and the second adjusting groove are respectively connected and disposed on both sides of the through groove 220. The first insulating plug 310 is embedded in the first adjusting groove 320, and the second insulating plug is embedded in the second adjusting groove, so as to achieve better fixation of the second electrode 120.

[0040] In one embodiment, the thickness of the insulating plug is equal to the thickness of the negative electrode insulating sheet 200, so as to ensure that the embedded insulating plug can be flush with both sides of the negative electrode insulating sheet 200, effectively avoiding the problem that the size of the core structure 10 will increase due to the excessive thickness of the insulating plug protruding from both sides of the negative electrode insulating sheet 200 after assembly.

[0041] In one embodiment, the length of the movable groove formed by the first adjustment groove 320, the second adjustment groove, and the through groove 220 is in the ratio of (0.2-0.6):1 to the diameter of the negative electrode insulating sheet 200. This ensures that the distribution of the first adjustment groove 320, the second adjustment groove, and the through groove 220 on the negative electrode insulating sheet 200 is more suitable, so as to better meet the operator's flexible adjustment of the position of the second electrode tab 120 in the movable groove, and also facilitate the operator to quickly complete the through operation of the second electrode tab 120.

[0042] In one embodiment, the distance between the through groove 220 and the welding hole 210 is 0.01mm-10.0mm. This ensures that the thickness of the sidewall formed between the through groove 220 and the welding hole 210 is not too thin, thereby providing better structural support for the second tab 120 when it is bent. It also ensures that the distance between the second tab 120 and the center hole 130 is relatively close, so that the second tab 120 and the first tab 110 are relatively evenly positioned on the core 100, thereby effectively ensuring a uniform current distribution in the bipolar semi-solid cylindrical lithium battery.

[0043] In one embodiment, the diameter of the welding hole 210 is not less than the diameter of the center hole 130 of the core 100, so that the welding needle can quickly complete the welding operation.

[0044] In one embodiment, the insertion slot 220 is rectangular to better fit the shape of the actual second electrode tab 120, so as to ensure that the operator can quickly complete the insertion operation of the second electrode tab 120.

[0045] In one embodiment, the welding hole 210 is circular or square. Further, the welding hole 210 is circular, as a circular welding hole 210 better fits the shape of the central hole 130, facilitating rapid welding operation by the welding needle.

[0046] In one embodiment, the center point of the through groove 220 and the center point of the center hole 130 are on the same straight line.

[0047] In one embodiment, the ratio of the diameter of the welding hole 210 to the width of the first tab 110, the width of the second tab 120, and the diameter of the center hole 130 is 1:(1.01-1.5):(1.01-1.5):(0.1-0.3); to ensure that the first tab 110 and the second tab 120 can completely cover the welding hole 210 using less material.

[0048] This disclosure also operates a bipolar semi-solid cylindrical lithium battery, including the wound core structure 10 for the bipolar semi-solid cylindrical lithium battery described in any of the above embodiments. The bipolar semi-solid cylindrical lithium battery further includes a steel shell, a positive electrode insulating sheet, and an end cap. The wound core structure 10 is disposed within the steel shell. The negative electrode of the wound core structure 10 is welded and fixed to the steel shell, and the positive electrode of the wound core structure 10 passes through the positive electrode insulating sheet and is welded and fixed to the end cap. Since the end cap is prior art, it is not specifically limited in this disclosure. One end of the wound core structure 10 is the negative electrode, with a negative electrode tab formed thereon, and the other end is the positive electrode, with a positive electrode tab formed thereon. The number of positive electrode tabs is two.

[0049] Compared with the prior art, this disclosure has at least the following advantages:

[0050] 1) Since the through groove 220 is adapted to the second electrode tab 120, the second electrode tab 120 passes through the through groove 220 and is at least partially exposed, so that the operator can complete the through operation of the electrode tab of the core 100; and since the through groove 220 and the welding hole 210 are staggered, that is, the welding hole 210 and the through groove 220 are set separately, and the side wall of the separately set welding hole 210 can provide better structural support for the second electrode tab 120 during the bending operation, so as to ensure that the second electrode tab 120 is not prone to wrinkles or other quality problems during the bending process, thereby effectively ensuring the flatness of the bending part of the second electrode tab 120, which is beneficial to subsequent welding.

[0051] 2) Since the width of the first tab 110 and the width of the second tab 120 are both greater than the diameter of the welding hole 210, the length of the first tab 110 is greater than the maximum value of the distance between the first tab 110 and the outer periphery of the outline of the welding hole 210, and the length of the exposed second tab 120 is greater than the maximum value of the distance between the second tab 120 and the outer periphery of the outline of the welding hole 210, it is ensured that the first tab 110 and the second tab 120 after bending can completely cover the welding hole 210, effectively avoiding the problem of the core 100 being exposed, thereby reducing the probability of a short circuit between the core 100 and the steel shell.

[0052] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A core structure for a bipolar semi-solid cylindrical lithium battery, comprising a core and a negative electrode insulating sheet, wherein the negative electrode tab of the core includes a first tab and a second tab, the first tab being located on the outermost ring of the core, and the second tab being disposed adjacent to the center hole of the core; the negative electrode insulating sheet having a through-hole corresponding to the center hole, characterized in that, The negative electrode insulating sheet also has a through groove, which is offset from the welding hole. The through groove is adapted to the second electrode tab, which passes through the through groove and is at least partially exposed. The width of the first electrode tab and the width of the second electrode tab are both greater than the diameter of the welding hole. The length of the first electrode tab is greater than the maximum value of the distance between the first electrode tab and the outer periphery of the welding hole. The length of the exposed second electrode tab is greater than the maximum value of the distance between the second electrode tab and the outer periphery of the welding hole.

2. The core structure for a bipolar semi-solid cylindrical lithium battery according to claim 1, characterized in that, The core structure also includes an insulating plug, and the negative electrode insulating sheet is further formed with an adjustment groove. The adjustment groove extends along the length direction of the through groove and communicates with the through groove. The insulating plug is embedded in the adjustment groove and is used to limit and fix the second electrode tab.

3. The core structure for a bipolar semi-solid cylindrical lithium battery according to claim 2, characterized in that, The number of insulating plugs is two, namely a first insulating plug and a second insulating plug. The number of adjusting grooves is two, namely a first adjusting groove and a second adjusting groove. The first adjusting groove and the second adjusting groove are respectively connected and disposed on both sides of the through groove. The first insulating plug is embedded in the first adjusting groove and the second insulating plug is embedded in the second adjusting groove.

4. The jelly-roll structure for a bipolar tab half-solid cylindrical lithium battery according to claim 3, wherein The thickness of the insulating plug is equal to the thickness of the negative electrode insulating sheet; and / or, The ratio of the length of the movable groove formed by the first adjustment groove, the second adjustment groove and the through groove to the diameter of the negative electrode insulating sheet is (0.2-0.6):

1.

5. The jelly-roll structure for a bipolar tab half-solid state cylindrical lithium battery according to claim 1, wherein The distance between the through groove and the welding hole is 0.01mm-10.0mm; and / or, The diameter of the welding hole is not less than the diameter of the center hole of the core.

6. The jelly-roll structure for a bipolar tab half-solid state cylindrical lithium battery according to claim 1, wherein The through-slot is rectangular.

7. The jelly-roll structure for a bipolar-cup semi-solid cylindrical lithium battery according to claim 1, wherein The welding holes are circular or square.

8. The jelly-roll structure for a bipolar tab half-solid state cylindrical lithium battery according to claim 1, wherein The center point of the through groove and the center point of the center hole are on the same straight line. 9.The jelly-roll structure for a bipolar tab half-solid cylindrical lithium battery according to claim 1, wherein The ratio of the diameter of the welding hole to the width of the first electrode tab, the width of the second electrode tab, and the diameter of the center hole is 1:(1.01-1.5):(1.01-1.5):(0.1-0.3).

10. A bipolar tab half-solid cylindrical lithium battery, characterized by, The included core structure for a bipolar semi-solid cylindrical lithium battery according to any one of claims 1-9.

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