Pole core, battery, battery module, battery pack and electric equipment

Abstract

The utility model discloses a pole core, a battery, a battery module, a battery pack and electric equipment. The pole core comprises a center hole, a plurality of pole pieces and a plurality of pole pieces, the current collector comprises a winding starting end and a winding ending end which are opposite to each other along the winding direction; the first tab is connected with the current collector and is arranged on the edge of one side of the current collector; the second tab is connected with the current collector and is arranged between the winding starting end and the first first tab; and after the first tab and the second tab are bent, at least part of central holes are reserved to be communicated with the outside of the pole core. According to the pole core disclosed by the utility model, the problem that the current density of the inner ring of the pole core is relatively large is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a pole core, a battery, a battery module, a battery pack and electrical equipment. Background Art

[0002] In a wound battery, if the battery tab is set at the end near the center hole of the battery after the pole core is wound, the tab is easy to block the center hole. Therefore, the tab is usually separated from the end near the center hole of the battery after the pole core is wound with a preset distance to form a tab-free area. However, this will cause the current on the pole core in the tab-free area to flow into (out) from near the first tab in the inner circle of the battery cell, resulting in a large current density in this area, causing the voltage to drop rapidly to the cut-off voltage during discharge, and the degree of uneven distribution of this current density will increase with the increase of current and time, making it difficult to meet the ultra-high power charging and discharging requirements of power batteries. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a pole core, during charging and discharging, the current is evenly distributed on the pole core and the safety is high.

[0004] Another purpose of the utility model is to provide a battery

[0005] Another object of the present invention is to provide a battery module.

[0006] Another object of the present invention is to provide a battery pack.

[0007] Another object of the present invention is to provide an electrical device.

[0008] According to the first aspect of the present invention, the pole core includes: a central injection hole; a current collector, including a winding starting end and a winding ending end opposite to each other along the winding direction; a first pole ear, the first pole ear is connected to the current collector and is arranged at an edge of one side of the current collector; a second pole ear, the second pole ear is connected to the current collector and is arranged between the winding starting end and the first of the first pole ears; after the first pole ear and the second pole ear are bent, at least part of the center hole is left to communicate with the outside of the pole core.

[0009] According to the pole core of the specific embodiment of the utility model, the first pole ear and the second pole ear are combined. By combining the second pole ear with the first pole ear, the central hole is avoided from being blocked and the wetting effect is ensured. At the same time, the problem of high current density in the inner circle of the pole core is also solved, and the high-power charging and discharging capability of the battery is further improved, thereby improving the market competitiveness of the battery of the utility model in the application field of ultra-high power batteries.

[0010] According to some embodiments of the present invention, the current collector forms a first current collecting section between the first first pole ear along the winding direction and the starting end of the winding, and the first current collecting section has a preset length L1. The current collector forms a second current collecting section between the first first pole ear along the winding direction and the winding ending end, and along the winding direction, the ratio of the sum of the widths of the second pole ears to the length of the first current collecting section is smaller than the ratio of the sum of the widths of the first pole ears to the length of the second current collecting section.

[0011] According to some embodiments of the present invention, L1 satisfies: 150mm≤L1≤450mm.

[0012] According to some embodiments of the utility model, in the first current collecting section, when there is one second pole lug, the second pole lug is arranged at ½L1 of the first current collecting section; when there are two second pole lugs, after the pole core is wound around the center, the two second pole lugs are bent in a direction away from the central axis of the pole core and are located on the same straight line.

[0013] According to some embodiments of the present invention, after the first current collecting section is wound, it is closer to the central axis of the pole core than after the second current collecting section is wound.

[0014] According to some embodiments of the present invention, the first current collecting section is wound to form 5 to 18 turns closest to the central axis of the pole core.

[0015] According to some embodiments of the present invention, when there are two or more second pole tabs, the minimum spacing between two adjacent second pole tabs along the winding direction is greater than or equal to the maximum spacing between two adjacent first pole tabs.

[0016] According to some embodiments of the present invention, the second pole tab is externally connected to the first current collecting section.

[0017] According to some embodiments of the present invention, the second pole ear includes a connecting portion and an extending portion, the connecting portion and the extending portion are connected to each other along the length direction of the second pole ear, the connecting portion is welded to the current collector, and the extending portion extends from the one side edge of the current collector toward a direction away from the current collector.

[0018] According to some embodiments of the present invention, the length of the connecting portion is h1, wherein h1 satisfies: 10mm≤h1≤20mm; and / or the length of the extending portion is h2, wherein h2 satisfies: 8mm≤h2≤15mm.

[0019] According to some embodiments of the present invention, h1 further satisfies: 12mm≤h1≤18mm; and / or h2 further satisfies: 9mm≤h2≤12m.

[0020] According to some embodiments of the present invention, the width of the second pole ear is d1, wherein d1 satisfies: 2mm≤d1≤8mm.

[0021] According to some embodiments of the present invention, the d1 further satisfies: 3mm≤d1≤6mm.

[0022] According to some embodiments of the present invention, the widths of the plurality of first pole tabs tend to increase along the first direction.

[0023] According to some embodiments of the present invention, the widths of the plurality of first pole tabs are the same.

[0024] According to some embodiments of the present invention, the width of the second pole tab is d1, and the width of the first pole tab is d2, wherein d1 and d2 satisfy: d2≥d1.

[0025] According to some embodiments of the present invention, it further includes: a first insulating protective glue, wherein the first insulating protective glue is at least arranged on the surface of the connecting portion away from the current collector in the thickness direction.

[0026] According to some embodiments of the utility model, it also includes: a first insulating protective glue, which is at least arranged on the surface of the connecting part away from the current collector in the thickness direction of the connecting part, and the width of the first insulating protective glue is greater than or equal to the width of the connecting part; and / or the length of the first insulating protective glue is greater than or equal to the length of the connecting part.

[0027] According to some embodiments of the present invention, the first insulating protective adhesive is PET insulating adhesive.

[0028] According to some embodiments of the present invention, a dressing area and a blank area are provided on the surface of at least one side in the thickness direction of the current collector, and the second electrode tab is provided in the blank area.

[0029] According to some embodiments of the present invention, the current collector is a positive electrode current collector or a negative electrode current collector. When the current collector is a positive electrode current collector, the second pole ear is an aluminum part; and / or when the current collector is a negative electrode current collector, the second pole ear is a copper part and / or a nickel part.

[0030] According to some embodiments of the utility model, when the current collector is a positive electrode current collector, a positive electrode dressing area and a positive electrode blank area are provided on the surface of at least one side in the thickness direction of the positive electrode current collector, and the second pole ear is provided in the positive electrode blank area; the positive electrode core further includes: a second insulating protective glue, the second insulating protective glue is provided on the surface of the positive electrode dressing area on the side away from the positive electrode current collector, and along the radial direction of the core, the second insulating protective glue is provided corresponding to the second pole ear on the negative electrode current collector.

[0031] According to some embodiments of the utility model, when the current collector is a negative electrode current collector, a negative electrode dressing area and a negative electrode blank area are provided on the surface of at least one side in the thickness direction of the negative electrode current collector, and the second electrode ear is provided in the negative electrode blank area; the width of the negative electrode blank area is less than or equal to the width of the second insulating protective glue; and / or the length of the negative electrode blank area is less than or equal to the length of the second insulating protective glue.

[0032] According to an embodiment of the second aspect of the utility model, the utility model provides a battery, comprising: the pole core according to the embodiment of the first aspect of the utility model; and a current collecting plate, wherein the second pole ear is bent and connected to the current collecting plate.

[0033] According to some embodiments of the present invention, the current collecting plate is formed with a through hole, and the second pole tab is penetrated through the through hole, bent away from the through hole and welded to the current collecting plate.

[0034] According to some embodiments of the present invention, the radius of the pole core formed by the first current collecting section is r0, the radius of the center hole is r1, and the height of the first pole ear is h6, wherein r0, r1, and h6 satisfy: r0≥r1+h6.

[0035] According to an embodiment of the third aspect of the utility model, the utility model provides a battery module, including the battery according to the embodiment of the second aspect of the utility model.

[0036] According to an embodiment of the fourth aspect of the utility model, the utility model provides a battery pack, including the battery according to the embodiment of the second aspect of the utility model, or including the battery module according to the embodiment of the third aspect of the utility model.

[0037] According to an embodiment of the fifth aspect of the utility model, the utility model provides an electrical device, including the battery according to the embodiment of the second aspect of the utility model, or including the battery module according to the embodiment of the third aspect of the utility model, or including the battery pack according to the embodiment of the fourth aspect of the utility model.

[0038] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0040] Figure 1 It is a structural schematic diagram of a pole core (before winding) according to an embodiment of the utility model (positive pole);

[0041] Figure 2 is a schematic structural diagram of a current collector (before winding) according to another embodiment of the utility model (negative electrode);

[0042] Figure 3 It is a schematic diagram of a battery structure according to a specific embodiment of the utility model.

[0043] Reference numerals:

[0044] 100: core;

[0045] 1: blank area; 2: second pole ear; 3: first pole ear; 4: first insulating protective glue; 5: second insulating protective glue;

[0046] 200: Battery;

[0047] 6: current collecting plate, 61: through hole. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 2 The pole core 100 of the first embodiment of the utility model is described. Figure 1 and Figure 2 As shown, the pole core 100 (before winding) includes a central hole (not shown), a current collector, a second pole tab 2 and a first pole tab 3 .

[0049] The current collector includes a Figure 1 and Figure 2 The winding starting end and the winding ending end are opposite to each other (from left to right as shown).

[0050] In addition, the first pole tab 3 is connected to the current collector and arranged at one edge of the current collector, and the second pole tab 2 is connected to the current collector and arranged between the winding start end and the first first pole tab 3. In this arrangement, the second pole tab 2 is arranged close to the start end of the current collector.

[0051] Furthermore, after the first pole tab 3 and the second pole tab 2 are bent, at least part of the center hole is left to communicate with the outside of the pole core 100. This arrangement ensures that the first pole tab 3 and the second pole tab 2 do not completely block the center hole after being bent, making it convenient to inject liquid through the center hole to form the battery 200.

[0052] According to the pole core 100 of the specific embodiment of the utility model, the second pole ear 2 and the first pole ear 3 are combined to avoid blocking the central hole and ensure the wetting effect, and at the same time solve the problem of high current density in the inner circle of the pole core 100, further improve the high-power charging and discharging capability of the battery 200, and improve the market competitiveness of the battery 200 of the utility model in the application field of ultra-high power batteries 200. Optionally, the battery 200 of the utility model is a cylindrical battery.

[0053] According to some embodiments of the utility model, the current collector forms a first current collecting section between the first first pole lug 3 and the winding start end along the winding direction, and the first current collecting section has a preset length L1, and the current collector forms a second current collecting section between the first first pole lug 3 and the winding end along the winding direction. In this way, when winding to form the pole core 100, the first current collecting section is used to form the inner circle of the pole core 100, and the second current collecting section is used to form the outer circle of the pole core 100. In this way, the first current collecting section where the second pole lug 2 is located is wound first, and the second current collecting section where the first pole lug 3 is located is wound later. Compared with the first pole lug 3, the second pole lug 2 is closer to the central axis of the pole core 100. It can be understood that the first pole lug 3 is located in the outer circle of the winding part of the pole core 100, and the second pole lug 2 is located in the inner circle of the winding part of the pole core 100. It is understandable that the inner circle of the winding part of the pole core 100 referred to in the present application can be a circle of the winding part closest to the central axis of the pole core 100, or two, three or more circles close to the central axis of the pole core 100, and the outer circle refers to a circle of the winding part closest to the outside, or two, three or more circles close to the outside. At the same time, along the winding direction, the ratio of the sum of the widths of the second pole lugs 2 to the length of the first current collecting section is less than the ratio of the sum of the widths of the first pole lugs 3 to the length of the second current collecting section. In this way, the second pole lug 2 accounts for a small proportion of the length of the first current collecting section, the second pole lug 2 is relatively sparse / or the width of the second pole lug 2 is narrow, so that the bending of the second pole lug 2 after winding will not block the center hole.

[0054] According to some embodiments of the utility model, L1 satisfies: 150mm≤L1≤450mm. In this way, if L1 is less than 150mm, the length of the first current collecting section is small. When winding to form the pole core 100, the first pole ear 3 is close to the center hole, and the first pole ear 3 after bending may block the center hole; if L1 is greater than 450mm, the length of the first current collecting section is large, the two pole ears are relatively sparse / or the width of the second pole ear 2 is narrow. When winding to form the pole core 100, the total number of pole ears is small, which is not conducive to the transmission of current and easily causes a large current density near the center hole. By setting, L1 satisfies 150mm≤L1≤450mm, and the length of the first current collecting section is appropriate, which can avoid the possibility of the first pole ear 3 after bending blocking the center hole, and ensure the transmission of current. Thereby, it is beneficial to improve the charging and discharging performance of the current.

[0055] According to some embodiments of the present invention, Figure 1 In the first current collecting section, there are one or two second pole lugs 2. When there is one second pole lug 2, the second pole lug 2 is arranged at ½ L1 of the first current collecting section. In this way, the impedance of the current collector is reduced to ¼ of the original impedance (when the second pole lug 2 is not externally connected). Thus, the resistance of the current collector is reduced.

[0056] According to some embodiments of the present invention, when there are two second pole tabs 2, after the pole core 100 is wound around the center, the two second pole tabs 2 are bent in a direction away from the central axis of the pole core 100 and are located on the same straight line. In this way, when the pole core 100 is wound, the two second pole tabs 2 overlap, which can reduce the number of welding times in the subsequent process.

[0057] According to some embodiments of the present invention, the first current collecting section is wound closer to the central axis of the pole core 100 than the second current collecting section. In this way, the second pole tab 2 is closer to the central axis of the pole core 100 than the first pole tab 3. In this way, the pole tabs near the central axis of the pole core 100 are sparsely distributed or the width of the pole tabs is narrow, which facilitates the reservation of part of the center hole to communicate with the outside of the pole core 100.

[0058] According to some embodiments of the present invention, the first current collecting section is wound to form 5 to 18 turns closest to the central axis of the pole core 100. In this way, within the range of 5 to 18 turns close to the central axis of the pole core 100, the pole ears are sparsely distributed or the width of the pole ears is narrow, which is convenient for leaving part of the center hole to communicate with the outside of the pole core 100.

[0059] According to some embodiments of the present invention, when there are two or more second pole tabs 2, the minimum spacing between two adjacent second pole tabs 2 along the winding direction is greater than or equal to the maximum spacing between two adjacent first pole tabs 3. In this way, the distribution density of the second pole tabs 2 on the first current collecting section is less than the distribution density of the first pole tabs 3 on the second current collecting section, and the second pole tabs 2 are distributed more sparsely on the first current collecting section.

[0060] According to some embodiments of the utility model, the second pole tab 2 is externally connected to the first current collecting section. Among them, welding, bonding and the like can be adopted. But it is not limited thereto. By introducing the second pole tab 2 in the first current collecting section by external connection, the number of pole tabs on the pole core 100 can be increased, which facilitates the conduction of current and does not block the central hole of the battery 200.

[0061] According to some embodiments of the utility model, the second pole tab 2 includes a connecting portion and an extending portion, the connecting portion and the extending portion are connected to each other along the length direction of the second pole tab 2, the connecting portion is welded to the current collector, and the extending portion extends from a side edge of the current collector toward a direction away from the current collector. Such an arrangement facilitates the external connection of the second pole tab 2 to the current collector.

[0062] According to some embodiments of the present invention, Figure 1 , the length of the connection portion is h1, wherein h1 satisfies: 10mm≤h1≤20mm. In this way, if h1 is less than 10mm, the length of the connection portion is small, and the connection strength between the second pole ear 2 and the current collector may be weak. If h1 is greater than 20mm, the length of the connection portion is large, the area on the current collector where the active material is applied becomes smaller, and the amount of active material on the current collector is small, which may affect the performance of the pole core 100. By setting h1 to satisfy 10mm≤h1≤20mm, the length of the connection portion is appropriate, which can ensure both the connection strength between the second pole ear 2 and the current collector and the amount of active material on the pole core 100, that is, the activity of the pole core 100 is ensured. For example, h1 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm, etc. But not limited thereto. Preferably, d1 further satisfies: 3mm≤d1≤6mm. For example, h1 is 12 mm, 15 mm or 18 mm. In this way, the length of the connecting portion is more suitable.

[0063] According to some embodiments of the present invention, Figure 1, the length of the extension is h2, wherein h2 satisfies: 8mm≤h2≤15mm. In this arrangement, if h2 is less than 8mm, the length of the extension is small, which may result in a weak connection strength between the second pole ear 2 and the current collecting disk 6 when the battery 200 is subsequently formed. If h2 is greater than 15mm, the length of the extension is large, which may cause an increase in ohmic impedance. By setting h2 to satisfy 8mm≤h2≤15mm, the length of the extension is appropriate, which can ensure the connection strength between the second pole ear 2 and the current collecting disk 6 and will not cause an increase in the ohmic impedance of the second pole ear 2. For example, h2 can be 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm, etc. But not limited thereto. Preferably, h2 further satisfies: 9mm≤h2≤12mm. For example, h2 is 9mm, 11mm or 12mm.

[0064] According to some embodiments of the present invention, Figure 1 , the width of the second pole ear 2 is d1, wherein d1 satisfies: 2mm≤d1≤8mm. In this way, if d1 is less than 2mm, the width of the second pole ear 2 is small, which may increase the difficulty of the second pole ear 2 process. If d1 is greater than 8mm, the width of the second pole ear 2 is large. Since the inner ring curvature is large when the pole core 100 is wound to form the pole core 100, the excessive width of the second pole ear 2 may cause transverse tearing. By setting d1 to satisfy 2mm≤d1≤8mm, the width of the second pole ear 2 is suitable, easy to manufacture, and the second pole ear 2 can be prevented from breaking due to the large inner ring curvature. For example, d1 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm. Etc., but not limited thereto. Preferably, d1 further satisfies: 3mm≤d1≤6mm. For example, d1 can be 3mm, 4mm or 6mm. Etc., but not limited thereto. It is more appropriate to set the width of the second pole ear 2 in this way.

[0065] According to some embodiments of the utility model, the width of the plurality of first pole lugs 3 increases along the winding direction. Since the inner ring curvature is large when the pole core 100 is wound to form the pole core 100, the excessive width of the first pole lug 3 near the inner ring may cause transverse tearing. Along the first direction, that is, from the starting end of the winding of the pole core 100 to the end of the winding, the curvature of the pole core 100 gradually decreases, so the width of the first pole lug 3 at the corresponding position can gradually increase. In this way, it is convenient to prepare the first pole lug 3, and it is also beneficial for the current to be evenly distributed on the pole core 100 through the first pole lug 3. Among them, the width of the plurality of first pole lugs 3 can increase regularly or disorderly along the first direction. For example, it can increase at a certain growth rate, or it can be, increase-remain unchanged-increase, etc., but it is not limited to this.

[0066] According to some embodiments of the present invention, the widths of the plurality of first pole tabs 3 are the same. This arrangement facilitates the arrangement of the plurality of first pole tabs 3 on the current collector.

[0067] According to some embodiments of the present invention, the width of the second pole tab 2 is d1, and the width of the first pole tab 3 is d2, wherein d1 and d2 satisfy: d2 ≥ d1. Such a configuration is adapted to the curvature change of the pole core 100, and the first pole tab 3 is prevented from breaking. For example, when d2 = d1, the widths of the second pole tab 2 and the first pole tab 3 are both small, and the safety of the pole core 100 when the pole core 100 is wound to form the pole core 100 is higher.

[0068] According to some embodiments of the present invention, it further includes: a first insulating protective glue 4, which is at least arranged on the surface of the connecting portion away from the current collector in the thickness direction. In this way, the first insulating protective glue 4 has a protective effect to prevent the pole core 100 (positive pole core or negative pole core) from short circuiting due to conduction.

[0069] According to some embodiments of the utility model, it further includes: a first insulating protective glue 4, the first insulating protective glue 4 is at least provided on the surface of the connecting portion away from the current collector in the thickness direction, and the width of the first insulating protective glue 4 is greater than or equal to the width of the connecting portion. In this way, the first insulating protective glue 4 can completely cover the connecting portion in the width direction, which is beneficial to the protection of the second electrode tab 2 by the first insulating protective glue 4.

[0070] Furthermore, the length of the first insulating protective adhesive 4 is greater than or equal to the length of the connecting portion. This arrangement allows the first insulating protective adhesive 4 to completely cover the connecting portion in the length direction, which is beneficial for the first insulating protective adhesive 4 to protect the second pole lug 2.

[0071] According to some embodiments of the present invention, Figure 1 , the width of the connection part is d1, and the width of the first insulating protective glue 4 is d3, wherein d1 and d3 satisfy: 1mm≤d3-d1≤2mm. In this way, if d3-d1 is less than 1mm, the width of the first insulating protective glue 4 is small, and the connection part may not be completely covered in the width direction, affecting the protection of the connection part by the first insulating protective glue 4, which may cause a short circuit; if d3-d1 is greater than 2mm, the width of the first insulating protective glue 4 is large, and the area covered on the current collector is large, which may result in a small amount of active material (which may be the material in the dressing area below) on the current collector, thereby affecting the performance of the pole core 100. By setting, so that d1 and d3 satisfy 1mm≤d3-d1≤2mm, the width of the first insulating protective glue 4 is appropriate, which can ensure that the first insulating protective glue 4 completely covers the connection part in the width direction, and will not affect the performance of the pole core 100.

[0072] According to other embodiments of the present invention, Figure 1 , the length of the connection part is h1, and the length of the first insulating protective glue 4 is h3, wherein h1 and h3 satisfy: 1mm≤h3-h1≤2mm. In this arrangement, if h3-h1 is less than 1mm, the length of the first insulating protective glue 4 is small, and the connection part may not be completely covered in the length direction, which affects the protection of the connection part by the first insulating protective glue 4 and may cause a short circuit; if h3-h1 is greater than 2mm, the length of the first insulating protective glue 4 is large, and the area covered on the current collector is large, which may result in a small amount of active substances (which may be substances in the dressing area below) on the current collector, thereby affecting the performance of the pole core 100. By setting, so that h1 and h3 satisfy 1mm≤h3-h1≤2mm, the length of the first insulating protective glue 4 is appropriate, which can ensure that the first insulating protective glue 4 completely covers the connection part in the length direction, and will not affect the performance of the pole core 100.

[0073] According to some embodiments of the utility model, the first insulating protective adhesive 4 is PET insulating adhesive. In this way, the PET insulating adhesive has good insulating protection performance, which can improve the connection strength between the second electrode tab 2 and the current collector, such as welding strength. At the same time, it can prevent welding slag and burrs generated by ultrasonic welding from piercing the diaphragm and causing a short circuit.

[0074] According to some embodiments of the utility model, at least one side of the surface of the current collector in the thickness direction is provided with a dressing area and a blank area, and the second pole ear 2 is provided in the blank area. Among them, the active material of the positive electrode or the negative electrode can be provided in the dressing layer to form a positive electrode core or a negative electrode core. And it is convenient to connect the second pole ear 2 to the blank area 1 without affecting the performance of the auxiliary material area.

[0075] According to some embodiments of the present invention, the width of the blank area 1 is greater than or equal to the width of the connecting portion. This arrangement facilitates the connection of the second electrode tab 2 to the blank area 1 .

[0076] According to some embodiments of the present invention, the height of the blank area 1 is greater than or equal to the height of the connecting portion. This arrangement facilitates the connection of the second electrode tab 2 to the blank area 1 .

[0077] According to some embodiments of the present invention, Figure 1, the width of the blank area 1 is d4, and the width of the connecting portion is d1, wherein d4 and d1 satisfy: 1mm≤d4-d1≤2mm. In this way, if d4-d1 is less than 1mm, the width of the blank area 1 is small, and in the width direction, when the second pole ear 2 is externally connected, it may affect the dressing area, thereby affecting the connection strength between the second pole ear 2 and the current collector; if d4-d1 is greater than 2mm, the width of the blank area 1 is large, and the area covered on the current collector is large, which may result in a small amount of active material on the current collector (which may be the material in the dressing area below), thereby affecting the performance of the pole core 100. By setting, so that d4 and d1 satisfy 1mm≤d4-d1≤2mm, the width of the blank area 1 is appropriate, which can ensure the connection strength between the second pole ear 2 and the current collector, and will not affect the performance of the pole core 100.

[0078] According to other embodiments of the present invention, Figure 1 , the length of the blank area 1 is h4, the length of the connecting portion is h1, and h4 and h1 satisfy: 1mm≤h4-h1≤2mm. In this way, if h4-h1 is less than 1mm, the length of the blank area 1 is small. In the length direction, when the second pole ear 2 is externally connected, it may affect the dressing area, thereby affecting the connection strength between the second pole ear 2 and the current collector; if h4-h1 is greater than 2mm, the length of the blank area 1 is large, and the area covered on the current collector is large, which may result in a small amount of active material on the current collector (which can be the material in the dressing area below), thereby affecting the performance of the pole core 100. By setting, so that h4 and h1 satisfy: 1mm≤h4-h1≤2mm, the length of the blank area 1 is appropriate, which can ensure the connection strength between the second pole ear 2 and the current collector, and will not affect the performance of the pole core 100.

[0079] According to some embodiments of the present invention, the thickness of the second pole tab 2 is less than or equal to the thickness of the dressing area. This arrangement avoids the current collector from breaking due to uneven stress at the junction of the second pole tab 2 and the current collector caused by the expansion of the pole core 100 during the cycle.

[0080] According to some embodiments of the present invention, the current collector is a positive electrode current collector or a negative electrode current collector. In this way, the current collector can be used as a positive electrode or a negative electrode as required.

[0081] According to some embodiments of the present invention, when the current collector is a positive electrode current collector, the second pole tab 2 is an aluminum part. Such a configuration facilitates external connection of the second pole tab 2 to the current collector and current transmission.

[0082] According to some embodiments of the present invention, when the current collector is a negative electrode current collector, the second pole tab 2 is a copper piece and / or a nickel piece. Such a configuration facilitates external connection of the second pole tab 2 to the current collector and current transmission.

[0083] According to some embodiments of the utility model, when the current collector is a positive electrode current collector, a positive electrode dressing area and a positive electrode blank area are provided on the surface of at least one side in the thickness direction of the positive electrode current collector, and the second pole ear 2 is provided in the positive electrode blank area; the positive electrode core further comprises: a second insulating protective glue 5, the second insulating protective glue 5 is provided on the surface of the positive electrode dressing area away from the current collector, and along the radial direction of the pole core 100, the second insulating protective glue 5 is provided corresponding to the second pole ear 2 of the negative electrode core. In this way, the second insulating protective glue 5 has a protective effect on the second pole ear 2 of the negative electrode core, and can prevent the risk of lithium precipitation caused by the inability to insert lithium after the positive electrode current collector is connected to the second pole ear 2 during the charge and discharge process.

[0084] According to some embodiments of the utility model, when the current collector is a negative electrode current collector, a negative electrode dressing area and a negative electrode blank area are provided on the surface of at least one side in the thickness direction of the negative electrode current collector, and the second pole ear 2 is provided in the negative electrode blank area; the width of the negative electrode blank area is less than or equal to the width of the second insulating protective glue 5. In this way, in the width direction, the second insulating protective glue 5 can completely cover the negative electrode blank area, so that the second pole ear 2 of the negative electrode core can be completely included, preventing the risk of lithium plating caused by the inability to insert lithium after the negative electrode current collector is connected to the second pole ear 2 during charging and discharging.

[0085] Furthermore, the length of the negative electrode blank area is less than or equal to the length of the second insulating protective glue 5. In this way, in the length direction, the second insulating protective glue 5 can completely cover the negative electrode blank area, so as to completely include the second pole ear 2 of the negative electrode core, thereby preventing the risk of lithium plating caused by the inability to insert lithium after the negative electrode core is connected to the second pole ear 2 during charging and discharging.

[0086] According to some embodiments of the present invention, Figure 1 and Figure 2 , the width of the negative electrode blank area is d4, and the width of the second insulating protective glue 5 is d5, wherein d4 and d5 satisfy: 1mm≤d5-d4≤2mm. If d5-d4 is less than 1mm, the difference between the width of the second insulating protective glue 5 and the width of the negative electrode blank area is small. In the width direction, the second insulating protective glue 5 may not completely cover the negative electrode blank area. During the charge and discharge process, there is a risk of lithium precipitation due to the inability to insert lithium after the negative electrode core is connected to the second pole ear 2. If d5-d4 is greater than 2mm, the difference between the width of the second insulating protective glue 5 and the width of the negative electrode blank area is large, and the area occupied by the second insulating protective glue 5 on the current collector is too large, which easily leads to less positive electrode dressing, thereby affecting the performance of the positive electrode core. By setting so that d4 and d5 satisfy 1mm≤d5-d4≤2mm, the difference between the width of the second insulating protective glue 5 and the width of the negative electrode blank area is appropriate, and the negative electrode core is highly safe and the positive electrode core has excellent performance.

[0087] According to other embodiments of the present invention, Figure 1 and Figure 2 , the length of the negative electrode blank area is h4, the length of the second insulating protective glue 5 is h5, and h4 and h5 satisfy: 1mm≤h5-h4≤2mm. If d5-d4 is less than 1mm, the difference between the width of the second insulating protective glue 5 and the width of the negative electrode blank area 1 is small. In the width direction, the second insulating protective glue 5 may not be able to completely cover the negative electrode blank area. During the charge and discharge process, there is a risk of lithium precipitation due to the inability to insert lithium after the negative electrode core is connected to the second pole ear 2. If d5-d4 is greater than 2mm, the difference between the width of the second insulating protective glue 5 and the width of the blank area 1 is large, and the area occupied by the second insulating protective glue 5 on the current collector is too large, which easily leads to less positive electrode dressing, thereby affecting the performance of the positive electrode core. By setting so that d4 and d5 satisfy 1mm≤d5-d4≤2mm, the difference between the width of the second insulating protective glue 5 and the width of the negative electrode blank area is appropriate, and the negative electrode core is highly safe and the positive electrode core has excellent performance.

[0088] According to some embodiments of the present invention, the second insulating protective adhesive 5 is PET insulating adhesive. In this way, the PET insulating adhesive has good insulating protection performance and can prevent welding slag and burrs generated by ultrasonic welding from piercing the diaphragm and causing a short circuit.

[0089] According to an embodiment of the second aspect of the utility model, the utility model provides a battery 200, including the pole core 100 and the current collecting plate 6 according to the embodiment of the first aspect of the utility model, and the second pole ear 2 is bent and connected to the current collecting plate 6.

[0090] According to the battery 200 of the specific embodiment of the present utility model, the pole core 100 (including the positive pole core and the negative pole core) has a second pole ear 2 and a first pole ear 3, so that the current of the inner circle and the outer circle of the pole core 100 can be evenly distributed, thereby improving the power of the battery 200.

[0091] According to some embodiments of the present invention, Figure 3 The current collecting plate 6 is formed with a through hole 61, and the second pole lug 2 is passed through the through hole 61, bent away from the through hole 61 and welded to the current collecting plate 6. In this way, the current collecting plate 6 and the pole core 100 are connected through the second pole lug 2 without blocking the center hole.

[0092] According to some embodiments of the present invention, Figure 1-Figure 3 , the radius of the pole core 100 formed by the first current collecting section is r0, the radius of the center hole is r1, and the height of the first pole ear 3 is h6, wherein r0, r1, and h6 satisfy: r0 ≥ r1 + h6. In this way, the length dimension of the first current collecting section and the radius of the winding core can be set as needed. It is ensured that when the pole ear is flattened, the center hole will not be covered. Among them, the height h6 of the first pole ear 3 refers to the length of the first pole ear 3 extending outward from the end of the current collector.

[0093] The assembly method of the battery 200 according to the specific embodiment of the utility model includes the following steps:

[0094] 1) Coating: Coat the positive electrode slurry (i.e., positive electrode active material) on a current collector, and reserve a certain width of uncoated area (including the second current collector section and the first current collector section) at the edge of the current collector; after rolling and cutting, the positive electrode sheet of the required specifications is made; Coat the negative electrode slurry on another current collector, and reserve a certain width of uncoated area (including the second current collector section and the first current collector section) at the edge of the current collector; after rolling and cutting, the negative electrode sheet of the required specifications is made;

[0095] 2) Laser cleaning: clean the dressing in the blank area 1 on the positive electrode sheet by laser cleaning so that the current collector of the positive electrode sheet is exposed and connected to the second electrode tab 2 on the positive electrode current collector; clean the dressing in the blank area on the negative electrode sheet so that the negative electrode current collector is exposed and connected to the second electrode tab 2 on the negative electrode current collector;

[0096] 3) Ultrasonic welding: Use ultrasonic welding to weld the second electrode tab 2 on the positive electrode collector to the blank area 1 corresponding to the positive electrode collector, and weld the second electrode tab 2 on the negative electrode collector to the blank area 1 corresponding to the negative electrode collector;

[0097] 4) Die cutting: using laser cutting technology, cut the first positive electrode tab 3 of the required specifications from the second current collecting section of the positive electrode core, and cut the first negative electrode tab 3 of the required specifications from the second current collecting section of the negative electrode current collector;

[0098] 5) Winding: Wind the negative electrode sheet, positive electrode sheet and separator along the first direction according to the rules. At the same time, use the winding machine to achieve the first pole ear 3 flattening process;

[0099] 6) Welding of the pole lug and the current collecting plate 6: The connecting portion of the second pole lug 2 of the positive electrode core is passed through the through hole 61 of the positive current collecting plate 6, and the electrical connection between the second pole lug 2 and the current collecting plate 6 is achieved by penetration welding; the connecting portion of the second pole lug 2 of the negative electrode core is passed through the through hole 61 of the negative current collecting plate 6, and the electrical connection between the second pole lug 2 and the current collecting plate 6 is achieved by penetration welding.

[0100] According to an embodiment of the third aspect of the utility model, the utility model provides a battery module, including a battery 200 according to an embodiment of the second aspect of the utility model.

[0101] According to the battery module of the present practical embodiment, the battery 200 has a relatively high power, thereby ensuring the working efficiency of the battery module.

[0102] According to an embodiment of the fourth aspect of the utility model, the utility model provides a battery pack, including the battery 200 according to the embodiment of the second aspect of the utility model, or including the battery module according to the embodiment of the third aspect of the utility model.

[0103] The battery pack according to the specific embodiment of the present utility model has higher working efficiency.

[0104] According to an embodiment of the fifth aspect of the utility model, the utility model provides an electric device, including a battery according to an embodiment of the second aspect of the utility model, or a battery module according to an embodiment of the third aspect of the utility model, or a battery pack according to an embodiment of the fourth aspect of the utility model. The electric device includes one or more of a vehicle (such as an electric two-wheeled vehicle), a ship, an aircraft, and an energy storage cabinet.

[0105] According to the electrical equipment of the specific embodiment of the present utility model, the power supply component has a higher working efficiency.

[0106] Other structures and operations of the pole core 100 according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0107] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0109] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pole core, characterized in that: include: Center hole; The current collector comprises a winding start end and a winding end which are opposite to each other along the winding direction; A first electrode tab, the first electrode tab is connected to the current collector and is disposed at an edge of one side of the current collector, and the first first electrode tab along the winding direction is spaced a preset length from the winding start end; A second pole tab, the second pole tab is connected to the current collector and is disposed between the winding start end and a first of the first pole tabs; After the first pole tab and the second pole tab are bent, at least a portion of the center hole is left to communicate with the outside of the pole core.

2. The pole core according to claim 1, characterized in that: The current collector forms a first current collecting section between the first first pole lug along the winding direction and the starting end of the winding, and the first current collecting section has a preset length L1. The current collector forms a second current collecting section between the first first pole lug along the winding direction and the winding ending end, and along the winding direction, the ratio of the sum of the widths of the second pole lugs to the length of the first current collecting section is smaller than the ratio of the sum of the widths of the first pole lugs to the length of the second current collecting section.

3. The pole core according to claim 2, characterized in that: The L1 satisfies: 150mm≤L1≤450mm.

4. The pole core according to claim 2, characterized in that: In the first current collecting section, when there is one second pole lug, the second pole lug is arranged at ½ L1 of the first current collecting section; When there are two second pole tabs, the two first pole tabs are located on the same straight line after being bent in a direction away from the central axis of the pole core.

5. The pole core according to claim 2, characterized in that: After the first current collecting section is wound, it is closer to the central axis of the pole core than after the second current collecting section is wound.

6. The pole core according to claim 5, characterized in that: After being wound, the first current collecting section forms 5 to 18 turns closest to the central axis of the pole core.

7. The pole core according to claim 1, characterized in that: When there are two or more second pole tabs, the minimum distance between two adjacent second pole tabs along the winding direction is greater than or equal to the maximum distance between two adjacent first pole tabs.

8. The pole core according to claim 2, characterized in that: The second pole tab is externally connected to the first current collecting section.

9. The pole core according to claim 8, characterized in that: The second pole tab includes a connecting portion and an extending portion, wherein the connecting portion and the extending portion are connected to each other along the length direction of the second pole tab, the connecting portion is welded to the current collector, and the extending portion extends from the one side edge of the current collector toward a direction away from the current collector.

10. The pole core according to claim 9, characterized in that: The length of the connecting portion is h1, wherein h1 satisfies: 10 mm ≤ h1 ≤ 20 mm; and / or The length of the extension portion is h2, wherein h2 satisfies: 8mm≤h2≤15mm.

11. The pole core according to claim 10, characterized in that: The h1 further satisfies: 12 mm ≤ h1 ≤ 18 mm; and / or The h2 further satisfies: 9mm≤h2≤12m.

12. The pole core according to claim 1, characterized in that: The width of the second electrode tab is d1, wherein d1 satisfies: 2mm≤d1≤8mm.

13. The pole core according to claim 12, characterized in that: The d1 further satisfies: 3mm≤d1≤6mm.

14. The pole core according to claim 1, characterized in that: The widths of the plurality of first pole tabs tend to increase along the winding direction.

15. The pole core according to claim 1, characterized in that: The widths of the plurality of first electrode tabs are the same.

16. The pole core according to claim 1, characterized in that: The width of the second pole tab is d1, and the width of the first pole tab is d2, wherein d1 and d2 satisfy: d2≥d1.

17. The pole core according to claim 9, characterized in that: Also includes: A first insulating protective adhesive is provided at least on a surface of the connecting portion in a thickness direction away from the current collector.

18. The pole core according to claim 9, characterized in that: Also includes: A first insulating protective adhesive, the first insulating protective adhesive being at least provided on a surface of the connecting portion in a thickness direction away from the current collector, the width of the first insulating protective adhesive being greater than or equal to the width of the connecting portion; and / or The length of the first insulating protective glue is greater than or equal to the length of the connecting portion.

19. The pole core according to claim 17, characterized in that: The first insulating protective adhesive is PET insulating adhesive.

20. The pole core according to claim 17, characterized in that: A dressing area and a blank area are provided on at least one surface of the current collector in the thickness direction, and the second electrode tab is provided in the blank area.

21. The pole core according to any one of claims 1 to 20, characterized in that: The current collector is a positive electrode current collector or a negative electrode current collector, When the current collector is a positive electrode current collector, the second electrode tab is an aluminum part; and / or When the current collector is a negative electrode current collector, the second electrode tab is a copper piece and / or a nickel piece.

22. The pole core according to claim 21, characterized in that: When the current collector is a positive electrode current collector, a positive electrode dressing area and a positive electrode blank area are provided on at least one surface of the positive electrode current collector in the thickness direction, and the second electrode tab is provided in the positive electrode blank area; The pole core further comprises: The second insulating protective glue is arranged on the surface of the positive electrode dressing area on one side away from the positive electrode collector, and along the radial direction of the pole core, the second insulating protective glue is arranged corresponding to the second pole ear on the negative electrode collector.

23. The pole core according to claim 22, characterized in that: When the current collector is a negative electrode current collector, a negative electrode dressing area and a negative electrode blank area are provided on at least one side of the surface of the negative electrode current collector in the thickness direction, and the second electrode tab is provided in the negative electrode blank area; the width of the negative electrode blank area is less than or equal to the width of the second insulating protective glue; and / or The length of the negative electrode blank area is less than or equal to the length of the second insulating protective glue.

24. A battery, characterized in that: include: The pole core according to any one of claims 1 to 23; The second electrode tab is bent and connected to the current collecting disk.

25. The battery according to claim 24, characterized in that The current collecting plate is formed with a through hole, and the second pole tab is passed through the through hole, bent away from the through hole and welded to the current collecting plate.

26. The battery according to claim 24 or 25, characterized in that The radius of the pole core formed by the first current collecting section is r0, the radius of the center hole is r1, and the height of the second pole lug is h6, wherein r0, r1, and h6 satisfy: r0≥r1+h6.

27. A battery module, characterized in that: Comprising a battery according to any one of claims 24-26.

28. A battery pack, characterized in that: A battery comprising any one of claims 24-26, or a battery module comprising claim 27.

29. An electrical equipment, characterized in that: Including the battery according to any one of claims 24-26, or including the battery module according to claim 27, or including the battery pack according to claim 28, the electrical equipment includes one or more of vehicles, ships, aircraft, and energy storage cabinets.

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