A cylindrical full-tab battery with a conductive shell

Abstract

The embodiment of the present application provides a cylindrical full-tab battery with a conductive shell, comprising a shell, a cylindrical battery cell, a first cap, a second cap, a first circular collector ring, and a second circular collector ring; the cylindrical battery cell is disposed within the shell; the first circular collector ring is clamped onto the inner side of one end of the cylindrical battery cell; the first cap is sleeved onto the end face of one end of the cylindrical battery cell, and the first cap abuts the end face of one end of the shell; the second circular collector ring is clamped onto the inner side of the other end of the cylindrical battery cell; the second cap is sleeved onto the end face of the other end of the cylindrical battery cell, and the second cap abuts the end face of the other end of the shell. The structure of the present application can effectively reduce the internal resistance of the cylindrical full-tab battery and effectively alleviate the situation of excessive local heat caused by a single tab; at the same time, the structure of the present application can avoid a series of problems caused by tab flattening, effectively improving the battery's yield rate.

Description

Technical Field

[0001] The present invention relates to the technical field of ion batteries, and in particular to a cylindrical full-tab battery with a conductive shell. Background Art

[0002] With the development of lithium-ion batteries, the structure of cylindrical lithium-ion batteries has been continuously improved. The traditional cylindrical battery structure generally includes: casing, cap, positive electrode, negative electrode, separator, electrolyte, PTC element, gasket, and safety valve. The battery is manufactured through a winding process. The separator acts as a separator between the positive and negative electrodes. The battery is filled with electrolyte to transport ions, and the current is conducted through the positive and negative electrode tabs. In addition, a safety valve and PTC element are installed to protect the battery in abnormal conditions and prevent safety accidents.

[0003] With the rapid development of electric vehicles, demands for high-current charge and discharge performance and safety performance of cylindrical power batteries are becoming increasingly stringent. However, single-pole cylindrical lithium-ion batteries can only transfer charge along the length of the current collector. This long conduction distance results in high internal resistance. Furthermore, during charge and discharge, the tab, or the connection between the tab and the current collector, or the connection between the tab and the casing, is prone to localized excessive heat, making it impossible to meet the heat dissipation requirements of high-current charge and discharge power batteries. Summary of the Invention

[0004] Based on this, the present invention provides a cylindrical, all-tab battery with a conductive shell, aiming to address the problems of high internal resistance and localized excessive heat in existing single-tab cylindrical batteries. The structure of this application has low internal resistance, effective heat dissipation, and easy electrolyte absorption, making it suitable for industrial applications.

[0005] To achieve the above-mentioned object, an embodiment of the present invention provides a cylindrical full-tab battery with a conductive shell, comprising a shell, a cylindrical battery cell, a first cap, a second cap, a first circular collector ring, and a second circular collector ring;

[0006] The cylindrical battery core is disposed in the housing; the first circular collector ring is clamped on the inner side of one end of the cylindrical battery core; the first cap is sleeved on the end surface of one end of the cylindrical battery core, and the first cap abuts against the end surface of one end of the housing;

[0007] The second circular collector ring is clamped on the inner side of the other end of the cylindrical battery core; the second cap is sleeved on the end surface of the other end of the cylindrical battery core, and the second cap abuts against the end surface of the other end of the shell.

[0008] As a preferred embodiment, the cylindrical battery cell is formed by winding a positive electrode sheet, a separator and a negative electrode sheet, and the separator is arranged between the positive electrode sheet and the negative electrode sheet.

[0009] As a preferred embodiment, the cylindrical battery core includes an outer cylindrical battery core and an inner cylindrical battery core that are adjacent to each other; the inner cylindrical battery core is arranged inside the outer cylindrical battery core.

[0010] As a preferred embodiment, the external cylindrical battery cell includes a first external vertical portion, a first external horizontal portion, a second external vertical portion, a second external horizontal portion and a third external vertical portion connected in sequence; the first external vertical portion is arranged close to the first cap, and the third external vertical portion is arranged close to the second cap; the first external horizontal portion and the second external horizontal portion are arranged in parallel.

[0011] As a preferred embodiment, the first outer vertical portion, the first outer transverse portion, the second outer vertical portion, the second outer transverse portion and the third outer vertical portion are integrally provided.

[0012] As a preferred embodiment, the first outer vertical portion and the second outer vertical portion are arranged at opposite ends of the first outer horizontal portion, and the first outer vertical portion and the first outer horizontal portion, and the second outer vertical portion and the first outer horizontal portion are all arranged perpendicularly;

[0013] The third outer vertical portion and the second outer vertical portion are arranged at two ends of the second outer transverse portion opposite to each other, and the third outer vertical portion and the second outer transverse portion, as well as the second outer vertical portion and the second outer transverse portion are all arranged perpendicularly.

[0014] As a preferred embodiment, the first outer vertical portion abuts against the outer shell, and the third outer vertical portion abuts against the outer shell.

[0015] As a preferred embodiment, the internal cylindrical battery cell includes a first inner horizontal portion, an inner vertical portion and a second inner horizontal portion connected in sequence; the first inner horizontal portion abuts against the first cover cap; the second inner horizontal portion abuts against the second cover cap; the inner vertical portion passes through the circular hole of the first circular collecting ring and the circular hole of the second circular collecting ring in sequence, and is arranged parallel to the second outer vertical portion.

[0016] As a preferred embodiment, the first inner transverse portion, the inner vertical portion and the second inner transverse portion are integrally arranged; the first inner transverse portion is perpendicular to the inner vertical portion, the second inner transverse portion is perpendicular to the inner vertical portion, and the first inner transverse portion and the second inner transverse portion are parallel to each other.

[0017] As a preferred embodiment, the first circular collector ring is disposed between the first outer transverse portion and the first inner transverse portion, and the first circular collector ring abuts against the first outer transverse portion and the first inner transverse portion respectively;

[0018] The second circular collector ring is disposed between the second outer transverse portion and the second inner transverse portion, and the second circular collector ring abuts against the second outer transverse portion and the second inner transverse portion respectively.

[0019] As a preferred embodiment, the first circular collector ring and the second circular collector ring are symmetrically arranged, and the first cover cap and the second cover cap are symmetrically arranged.

[0020] As a preferred embodiment, both the first cap and the second cap are boss-shaped caps with edges.

[0021] As a preferred embodiment, the shell includes a positive metal shell area, an insulating connection area and a negative metal shell area connected in sequence, the positive metal shell area is arranged close to the first cap, and the negative metal shell area is arranged close to the second cap; the positive metal shell area abuts the first external vertical portion, and the negative metal shell area abuts the third external vertical portion.

[0022] As a preferred embodiment, the cylindrical full-tab battery is a lithium-ion battery, a sodium-ion battery, a magnesium-ion battery or a potassium-ion battery.

[0023] Compared with the existing technology, this application has the following technical effects:

[0024] (1) Electrons are transmitted by the positive electrode metal shell region abutting against the first outer vertical portion and the negative electrode metal shell region abutting against the third outer vertical portion, so that electrons conducted along the length direction can be conducted along the width direction, shortening the charge transmission distance, thereby effectively reducing the internal resistance of the cylindrical battery.

[0025] (2) The positive metal shell area is abutted against the first outer vertical portion, and the negative metal shell area is abutted against the third outer vertical portion, which greatly increases the heat transfer channel of the battery cell. In addition, the numerous contact points between the battery cell and the shell are conducive to the rapid conduction of heat from the battery cell to the shell. Moreover, the connection between the outer vertical portion and the side wall of the shell can also improve the thermal field distribution, effectively alleviating the situation of excessive local heat caused by the single-pole ear.

[0026] (3) The structure of the present application can eliminate the tab flattening step of the existing mainstream cylindrical tab-free (full) tab batteries, avoid a series of problems caused by tab flattening, and effectively improve the battery yield.

[0027] (4) Compared with the existing mainstream cylindrical tab-free (full) batteries, the electrolyte of the structure of the present application is easier to penetrate and absorb.

[0028] (5) The production process of the structure of the present application is simple, easy to implement, and has high production efficiency, which is conducive to industrial application and easy to mass or industrial production.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the longitudinal cross-section of an exploded structure of a cylindrical full-tab battery with a conductive shell according to one embodiment of the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the longitudinal cross-sectional structure of a cylindrical battery cell;

[0032] Figure 3 for Figure 1 A schematic diagram of the front structure of the first circular collector ring;

[0033] Figure 4 for Figure 1 Schematic diagram of the longitudinal cross-sectional structure of the shell. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The rapid development of electric vehicles is driving increasing demands for cylindrical power batteries to deliver high-current charge and discharge performance and enhanced safety. However, single-tab cylindrical lithium-ion batteries can only transfer charge along the length of the current collector, a long conduction distance that results in high internal resistance. Furthermore, during charge and discharge, the tabs, or the connection between the tabs and the current collector, or the connection between the tabs and the housing, are prone to localized excessive heat, making them unable to meet the heat dissipation requirements of high-current charge and discharge for power batteries. Therefore, it is necessary to provide a cylindrical, all-tab battery with a conductive housing to address these technical issues.

[0040] To achieve the above purpose, if Figures 1 to 4 As shown, an embodiment of the present invention provides a cylindrical full-tab battery with a conductive shell, including a shell 10, a cylindrical battery cell 20, a first cap 30, a second cap 40, a first circular collector ring 50 and a second circular collector ring 60;

[0041] The cylindrical battery core 20 is disposed in the housing 10; the first circular collector ring 50 is clamped on the inner side of one end of the cylindrical battery core 20; the first cap sleeve 30 is disposed on the end surface of one end of the cylindrical battery core 20, and the first cap 30 abuts against the end surface of one end of the housing 10;

[0042] The second circular collector ring 60 is clamped on the inner side of the other end of the cylindrical battery core 20; the second cap sleeve 40 is provided on the end surface of the other end of the cylindrical battery core 20, and the second cap 40 abuts against the end surface of the other end of the shell 10.

[0043] As a preferred embodiment, the cylindrical battery cell 20 is formed by winding a positive electrode sheet (not marked in the figure), a separator (not marked in the figure) and a negative electrode sheet (not marked in the figure), and the separator is arranged between the positive electrode sheet and the negative electrode sheet.

[0044] As a preferred embodiment, the cylindrical battery core 20 includes an outer cylindrical battery core 21 and an inner cylindrical battery core 22 that are adjacent to each other; the inner cylindrical battery core 22 is disposed inside the outer cylindrical battery core 21 .

[0045] As a preferred embodiment, the external cylindrical battery cell 21 includes a first external vertical portion 211, a first external horizontal portion 212, a second external vertical portion 213, a second external horizontal portion 214 and a third external vertical portion 215 connected in sequence; the first external vertical portion 211 is arranged close to the first cap 30, and the third external vertical portion 215 is arranged close to the second cap 40; the first external horizontal portion 212 and the second external horizontal portion 214 are arranged in parallel.

[0046] As a preferred embodiment, the first outer vertical portion 211 , the first outer horizontal portion 212 , the second outer vertical portion 213 , the second outer horizontal portion 214 and the third outer vertical portion 215 are integrally provided.

[0047] As a preferred embodiment, the first outer vertical portion 211 and the second outer vertical portion 213 are arranged at opposite ends of the first outer horizontal portion 212, and the first outer vertical portion 211 and the first outer horizontal portion 212, and the second outer vertical portion 213 and the first outer horizontal portion 212 are all arranged perpendicularly;

[0048] The third outer vertical portion 215 and the second outer vertical portion 213 are disposed opposite to each other at two ends of the second outer horizontal portion 214 , and the third outer vertical portion 215 and the second outer horizontal portion 214 , as well as the second outer vertical portion 213 and the second outer horizontal portion 214 are all disposed perpendicularly.

[0049] As a preferred embodiment, the first outer vertical portion 211 abuts against the outer shell 10 , and the third outer vertical portion 215 abuts against the outer shell 10 .

[0050] As a preferred embodiment, the internal cylindrical battery core 22 includes a first inner horizontal portion 221, an inner vertical portion 222 and a second inner horizontal portion 223 connected in sequence; the first inner horizontal portion 221 abuts against the first cap 30; the second inner horizontal portion 223 abuts against the second cap 40; the inner vertical portion 222 passes through the circular hole of the first circular collecting ring 50 and the circular hole of the second circular collecting ring 60 in sequence, and is arranged parallel to the second outer vertical portion 213.

[0051] As a preferred embodiment, the first inner transverse portion 221, the inner vertical portion 222 and the second inner transverse portion 223 are integrally arranged; the first inner transverse portion 221 and the inner vertical portion 222 are perpendicularly arranged, the second inner transverse portion 223 and the inner vertical portion 222 are perpendicularly arranged, and the first inner transverse portion 221 and the second inner transverse portion 223 are parallelly arranged.

[0052] As a preferred embodiment, the first circular collector ring 50 is disposed between the first outer transverse portion 212 and the first inner transverse portion 221 , and the first circular collector ring 50 abuts against the first outer transverse portion 212 and the first inner transverse portion 221 respectively;

[0053] The second circular collector ring 60 is disposed between the second outer transverse portion 214 and the second inner transverse portion 223 , and the second circular collector ring 60 abuts against the second outer transverse portion 214 and the second inner transverse portion 223 , respectively.

[0054] As a preferred embodiment, the first circular collector ring 50 and the second circular collector ring 60 are symmetrically arranged, and the first cover cap 30 and the second cover cap 40 are symmetrically arranged.

[0055] As a preferred embodiment, both the first cap 30 and the second cap 40 are boss-shaped caps with edges.

[0056] As a preferred embodiment, the housing 10 includes a positive metal shell region 11, an insulating connection region 12, and a negative metal shell region 13, which are sequentially connected. The positive metal shell region 11 is located near the first cap 30, and the negative metal shell region 13 is located near the second cap 40. The positive metal shell region 11 abuts the first outer vertical portion 211, and the negative metal shell region 13 abuts the third outer vertical portion 215. This allows electrons that are conducted along the length direction to be conducted along the width direction, shortening the charge transmission distance and effectively reducing the internal resistance of the cylindrical full-tab battery.

[0057] As a preferred embodiment, the cylindrical full-tab battery is a lithium-ion battery, a sodium-ion battery, a magnesium-ion battery or a potassium-ion battery.

[0058] In the embodiment of the present application, the middle of the first cap and the second cap can be configured to have a threaded structure to facilitate assembly of the battery pack, thereby increasing the volume energy density of the entire battery pack. The cap is generally connected to the housing by welding.

[0059] In an embodiment of the present application, the first inner transverse portion and the second inner transverse portion can be welded to the upper surface of the circular collector ring through the circular collector ring. In this way, the welding area between the battery cell and the shell can be effectively increased, and the local excessive heat caused by the single pole ear can be effectively alleviated; at the same time, the first inner transverse portion, the second inner transverse portion and the bottom of the cap are abutted, and the pressure is controlled by adjusting the height of the outer shell, the cylindrical battery cell and the cap, so that the first inner transverse portion and the second inner transverse portion are in close contact with the bottom of the cap.

[0060] Compared with the existing technology, this application has the following technical effects:

[0061] (1) Electrons are transmitted by the positive electrode metal shell region abutting against the first outer vertical portion and the negative electrode metal shell region abutting against the third outer vertical portion, so that electrons conducted along the length direction can be conducted along the width direction, shortening the charge transmission distance, thereby effectively reducing the internal resistance of the cylindrical battery.

[0062] (2) The positive metal shell area is abutted against the first outer vertical portion, and the negative metal shell area is abutted against the third outer vertical portion, which greatly increases the heat transfer channel of the battery cell. In addition, the numerous contact points between the battery cell and the shell are conducive to the rapid conduction of heat from the battery cell to the shell. Moreover, the connection between the outer vertical portion and the side wall of the shell can also improve the thermal field distribution, effectively alleviating the situation of excessive local heat caused by the single-pole ear.

[0063] (3) The structure of the present application can eliminate the tab flattening step of the existing mainstream cylindrical tab-free (full) tab batteries, avoid a series of problems caused by tab flattening, and effectively improve the battery yield.

[0064] (4) Compared with the existing mainstream cylindrical tab-free (full) batteries, the electrolyte of the structure of the present application is easier to penetrate and absorb.

[0065] (5) The production process of the structure of the present application is simple, easy to implement, and has high production efficiency, which is conducive to industrial application and easy to mass or industrial production.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cylindrical full-tab battery with a conductive shell, characterized in that: It includes a housing, a cylindrical battery cell, a first cap, a second cap, a first circular collector ring and a second circular collector ring; The cylindrical battery core is disposed in the housing; the first circular collector ring is clamped on the inner side of one end of the cylindrical battery core; the first cap is sleeved on the end surface of one end of the cylindrical battery core, and the first cap abuts against the end surface of one end of the housing; The second circular collector ring is clamped on the inner side of the other end of the cylindrical battery core; the second cap is sleeved on the end surface of the other end of the cylindrical battery core, and the second cap abuts against the end surface of the other end of the shell; The cylindrical battery cell comprises an outer cylindrical battery cell and an inner cylindrical battery cell which are arranged adjacent to each other; the inner cylindrical battery cell is arranged on the inner side of the outer cylindrical battery cell; The outer cylindrical battery cell includes a first outer vertical portion, a first outer horizontal portion, a second outer vertical portion, a second outer horizontal portion, and a third outer vertical portion connected in sequence; the first outer vertical portion is arranged close to the first cap, and the third outer vertical portion is arranged close to the second cap; the first outer horizontal portion and the second outer horizontal portion are arranged in parallel; The housing includes a positive metal shell area, an insulating connection area, and a negative metal shell area connected in sequence, the positive metal shell area is arranged close to the first cap, and the negative metal shell area is arranged close to the second cap; the positive metal shell area abuts the first outer vertical portion, and the negative metal shell area abuts the third outer vertical portion; The first circular collector ring and the second circular collector ring are symmetrically arranged, and the first cap and the second cap are symmetrically arranged; The first cap and the second cap are both boss-shaped caps with edges; The cylindrical full-tab battery is a lithium ion battery, a sodium ion battery, a magnesium ion battery or a potassium ion battery.

2. The cylindrical full-tab battery with a conductive shell according to claim 1, characterized in that: The first outer vertical portion, the first outer transverse portion, the second outer vertical portion, the second outer transverse portion and the third outer vertical portion are integrally provided; The first outer vertical portion abuts against the outer shell, and the third outer vertical portion abuts against the outer shell.

3. The cylindrical full-tab battery with a conductive shell according to claim 2, characterized in that: The first outer vertical portion and the second outer vertical portion are arranged at opposite ends of the first outer horizontal portion, and the first outer vertical portion and the first outer horizontal portion, and the second outer vertical portion and the first outer horizontal portion are all arranged perpendicularly; The third outer vertical portion and the second outer vertical portion are arranged at two ends of the second outer transverse portion opposite to each other, and the third outer vertical portion and the second outer transverse portion, as well as the second outer vertical portion and the second outer transverse portion are all arranged perpendicularly.

4. The cylindrical full-tab battery with a conductive shell according to claim 3, characterized in that: The internal cylindrical battery core includes a first inner horizontal portion, an inner vertical portion, and a second inner horizontal portion connected in sequence; the first inner horizontal portion abuts against the first cap; the second inner horizontal portion abuts against the second cap; the inner vertical portion passes through the circular hole of the first circular collecting ring and the circular hole of the second circular collecting ring in sequence, and is arranged parallel to the second outer vertical portion.

5. The cylindrical full-tab battery with a conductive shell according to claim 4, characterized in that: The first inner transverse portion, the inner vertical portion and the second inner transverse portion are integrally arranged; the first inner transverse portion is perpendicular to the inner vertical portion, the second inner transverse portion is perpendicular to the inner vertical portion, and the first inner transverse portion and the second inner transverse portion are parallel to each other.

6. The cylindrical full-tab battery with a conductive shell according to claim 5, characterized in that: The first circular collector ring is disposed between the first outer transverse portion and the first inner transverse portion, and the first circular collector ring abuts against the first outer transverse portion and the first inner transverse portion respectively; The second circular collector ring is disposed between the second outer transverse portion and the second inner transverse portion, and the second circular collector ring abuts against the second outer transverse portion and the second inner transverse portion respectively.

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