Annular battery

Abstract

The annular battery comprises an annular bottom shell, an annular battery cell and an annular cover plate, a through hole penetrating through a first surface and a second surface of the annular bottom shell is formed in the middle of the annular bottom shell, an annular groove is formed in the first surface of the annular bottom shell, the annular groove is provided with an annular notch, and the annular battery cell is provided with a positive pole lug and a negative pole lug. The positive pole lug and the negative pole lug are symmetrically arranged by taking the central axis of the through hole as the center, the annular cover plate is used for sealing the annular notch, and the annular cover plate is respectively connected with the positive pole lug and the negative pole lug. Heat generated when the annular battery works is conducted out and dissipated through the outer side wall of the bottom shell, heat in the annular battery is rapidly conducted out through the through holes, the distance between the positive pole lug and the negative pole lug which are concentrated in heat is large, rapid heat dissipation can be conducted respectively, the overall heat dissipation performance of the annular battery is improved, and the service life of the annular battery is prolonged. The safety performance and the service life of the annular battery can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a toroidal battery. Background Technology

[0002] Batteries are commonly used power supply components, and lithium-ion batteries are a common type of battery. Lithium-ion batteries are rechargeable batteries, meaning they can be used multiple times by repeated charging. Lithium-ion batteries have the advantages of good cycle performance and good charge and discharge performance, making them the most widely used type of battery in people's daily lives. Depending on the material and shape of the casing, lithium-ion batteries typically include square batteries, cylindrical batteries, pouch batteries, and irregularly shaped batteries. Different shapes of lithium-ion batteries can be used in different application scenarios to meet different power supply needs.

[0003] However, as people's living standards improve, the performance requirements for lithium-ion batteries are also increasing. The energy density and power density of lithium-ion batteries are getting higher and higher. As lithium-ion batteries generate more and more heat during operation, the existing lithium-ion batteries have poor heat dissipation performance, which greatly affects the safety performance and service life of lithium-ion batteries. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a toroidal battery.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A toroidal battery, comprising:

[0007] An annular bottom shell, wherein the middle part of the annular bottom shell has a through hole penetrating the first and second surfaces of the annular bottom shell, and the first surface of the annular bottom shell has an annular groove with an annular opening;

[0008] A ring-shaped battery cell, wherein the ring-shaped battery cell is disposed within the ring-shaped groove through the ring-shaped slot, and the ring-shaped battery cell is provided with a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab being symmetrically arranged about the central axis of the through hole; and

[0009] An annular cover plate, the first surface of which is connected to the first surface of the annular bottom shell, is used to close the annular groove, thereby closing the annular recess, and the annular cover plate is connected to the positive electrode tab and the negative electrode tab respectively.

[0010] In one embodiment, the width of the through hole is greater than the width of the annular groove.

[0011] In one embodiment, the annular cover plate is provided with a positive terminal and a negative terminal, which are symmetrically arranged about the central axis of the through hole, and are respectively connected to the positive electrode tab and the negative electrode tab.

[0012] In one embodiment, the device further includes a first sealing ring, the annular cover plate having a first mounting hole communicating with the annular groove, the first sealing ring being disposed in the first mounting hole and sealingly connected to the inner sidewall of the first mounting hole, the positive terminal being inserted into the first sealing ring and connected to the positive terminal tab, and the positive terminal being at least partially protruding from the outer side of the second surface of the annular cover plate.

[0013] In one embodiment, the first sealing ring is provided with a first extension and a second extension, the first extension and the second extension being connected to the first surface and the second surface of the annular cover plate, respectively, and the first extension and the second extension protruding from the outer sides of the two ends of the positive terminal.

[0014] In one embodiment, a second sealing ring is further included. The annular cover plate has a second mounting hole that communicates with the annular groove. The second sealing ring is disposed in the second mounting hole and is sealed to the inner wall of the second mounting hole. The negative terminal is inserted into the second sealing ring and is connected to the negative electrode tab. The negative terminal protrudes at least partially from the outer side of the second surface of the annular cover plate.

[0015] In one embodiment, the second sealing ring is provided with a third extension and a fourth extension, the third extension and the fourth extension being connected to the first surface and the second surface of the annular cover plate, respectively, and the third extension and the fourth extension protruding from the outer sides of the two ends of the negative terminal.

[0016] In one embodiment, a sealing cap is further included. The annular cap has an injection hole that communicates with the annular groove. The sealing cap covers the injection hole and seals it closed.

[0017] The advantages and beneficial effects of this utility model compared to the prior art are as follows:

[0018] This invention features a hollow, annular bottom shell with through holes, and annular grooves to accommodate a matching annular battery cell. The positive and negative tabs of the annular battery cell serve as its positive and negative output terminals, respectively. These tabs are symmetrically arranged, allowing them to be positioned on opposite sides of the cell, thus increasing the distance between them. The tabs are then welded to an annular cover plate for electrical connection. The welded points serve as the positive and negative output terminals for connecting to external electrical equipment. The heat generated during operation can be dissipated not only through the outer wall of the bottom shell but also through the through holes. The large distance between the positive and negative tabs, where heat is concentrated, allows for rapid heat dissipation, significantly improving the overall heat dissipation performance of the annular battery. This prevents heat accumulation inside the battery, enhancing its safety and lifespan. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a toroidal battery according to one embodiment;

[0020] Figure 2 This is a three-dimensional exploded view of a toroidal battery according to one embodiment;

[0021] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model 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 of this utility model.

[0023] Please see Figure 1 , Figure 2 and Figure 3In one embodiment, a toroidal battery 10 is provided, including an annular bottom shell 100, an annular cell 200, and an annular cover plate 300. The annular bottom shell 100 has a through hole 101 in its center, penetrating both a first and second surface. An annular groove 102 is formed on the first surface of the annular bottom shell 100, and the annular groove 102 has an annular opening. The annular cell 200 is disposed within the annular groove 102 through the annular opening. The annular cell 200 is provided with a positive electrode tab 210 and a negative electrode tab 220, which are symmetrically arranged about the central axis of the through hole 101. The first surface of the annular cover plate 300 is connected to the first surface of the annular bottom shell 100. The annular cover plate 300 is used to close the annular opening, thereby closing the annular groove 102. The annular cover plate 300 is connected to both the positive electrode tab 210 and the negative electrode tab 220.

[0024] It should be noted that the annular bottom shell 100 is an annular shell with a through hole 101. The first surface of the annular bottom shell 100 has an annular groove 102 for accommodating the annular battery cell 200. In this embodiment, the annular battery cell 200 is a wound battery cell. The winding needle of the corresponding size can be used according to the size of the through hole 101, so that the positive electrode sheet, the separator and the negative electrode sheet can be stacked and wound to form a hollow annular battery cell 200 that matches the annular groove 102. The processing technology is simple and easy to process and form. The positive electrode tab 210 and the negative electrode tab 220 of the annular battery cell 200 are led out as the positive and negative output terminals of the annular battery cell 200. Specifically, after the positive electrode tab 210 and the negative electrode tab 220 are led out, they are folded and set on the side of the annular battery cell 200 near the annular groove, which is beneficial to better fit with the annular cover plate 300 later. The current welding electrical connection, and the insulating layer between the positive electrode tab 210 and the negative electrode tab 220 and the toroidal cell 200 can play an insulating role, preventing short circuit between the positive electrode tab 210 and the negative electrode tab 220 and the toroidal cell 200. The shape of the annular cover plate 300 is adapted to the first surface of the annular bottom shell 100. After the annular cell 200 is installed into the annular groove 102 and the electrolyte is injected, the annular cover plate 300 can be sealed and installed on the annular bottom shell 100 by sealing glue or welding process, thereby sealing the annular cell 200 in the annular groove 102 for protection. Then, the positive electrode tab 210 and the negative electrode tab 220 are welded and electrically connected to the annular cover plate 300 respectively by welding process, and the toroidal battery is encapsulated. The manufacturing process is simple and conducive to improving production efficiency.

[0025] Specifically, the positive electrode tab 210 and negative electrode tab 220 of the toroidal cell 200 serve as the positive and negative output terminals of the toroidal cell 200, respectively. The positive electrode tab 210 and negative electrode tab 220 are symmetrically arranged about the center of the toroidal cell, allowing them to be positioned on opposite sides of the cell. This arrangement increases the distance between the positive and negative electrode tabs. The positive electrode tab 210 and negative electrode tab 220 are then connected to the toroidal cover plate 300 by welding, achieving electrical connection. The welding point serves as... The positive and negative output terminals of the toroidal cell 200 are used to connect to external electrical equipment to provide power. The heat generated by the toroidal battery during operation can be dissipated not only through the outer wall of the bottom shell, but also through the through hole 101 to quickly dissipate the heat inside the toroidal battery. The heat dissipation area is greatly increased, and the distance between the positive electrode tab 210 and the negative electrode tab 220, where heat is concentrated, is large, allowing for rapid heat dissipation on their own. This greatly improves the overall heat dissipation performance of the toroidal battery, prevents heat from accumulating inside the toroidal battery, and helps to improve the safety performance and service life of the toroidal battery.

[0026] In one embodiment, the width of the through hole 101 is greater than the width of the annular groove 102. It is understood that by setting the width of the through hole 101, i.e., its diameter, to be greater than the width of the annular groove 102, a ring-shaped battery structure with a larger central through hole 101 can be formed. This further increases the inner wall surface area of ​​the through hole 101, thereby further increasing the overall heat dissipation area of ​​the ring-shaped battery. This is beneficial for further improving the heat dissipation performance of the ring-shaped battery, achieving better heat dissipation, faster heat dissipation rate, avoiding overheating of the ring-shaped battery, and improving service life and product quality.

[0027] Please see Figure 1 and Figure 2 In one embodiment, the annular cover plate 300 is provided with a positive terminal 310 and a negative terminal 320. The positive terminal 310 and the negative terminal 320 are symmetrically arranged about the central axis of the through hole 101. The positive terminal 310 and the negative terminal 320 are respectively connected to the positive electrode tab 210 and the negative electrode tab 220. Understandably, by setting symmetrical positive terminals 310 and negative terminals 320 on the annular cover plate 300, with the positions of the positive terminals 310 and negative terminals 320 corresponding vertically to the positions of the positive terminals 210 and negative terminals 220, it is possible to ensure that the positive terminals 310 and negative terminals 320 are properly soldered to the positive terminals 210 and negative terminals 220, respectively. In this way, the positive terminals 310 and negative terminals 320 can be used as the positive and negative output terminals of the annular battery cell 200 for electrical connection with external electrical devices, resulting in more stable contact and more stable power supply, thus improving practicality.

[0028] Please see Figure 2 In one embodiment, the device further includes a first sealing ring 400. The annular cover plate 300 has a first mounting hole 301, which communicates with the annular groove 102. The first sealing ring 400 is disposed in the first mounting hole 301 and is sealed to the inner sidewall of the first mounting hole 301. The positive terminal 310 is inserted into the first sealing ring 400 and is connected to the positive terminal tab 210. The positive terminal 310 protrudes at least partially from the outer side of the second surface of the annular cover plate 300. Understandably, by setting a first sealing ring 400, which is a hollow ring structure, and which can be made of insulating rubber material with certain cushioning properties, the sealing performance can be ensured. The annular cover plate 300 has a first mounting hole 301 at the corresponding position of the positive electrode tab 210. The first sealing ring 400 is installed in the first mounting hole 301 and seals the inner side wall of the first mounting hole 301. The positive terminal 310 is inserted into the annular groove 102 after being inserted into the first sealing ring 400, and abuts against the positive electrode tab 210. The positive terminal 310 and the positive electrode tab 210 can be electrically connected by welding. The positive terminal 310 protrudes from the outside of the annular cover plate 300, which facilitates the electrical connection between the positive terminal 310 and the external electrical equipment, and has good practicality.

[0029] Please see Figure 1 and Figure 2 In one embodiment, the first sealing ring 400 is provided with a first extension 410 and a second extension 420, the first extension 410 and the second extension 420 being connected to the first surface and the second surface of the annular cover plate 300 respectively, and the first extension 410 and the second extension 420 being provided to protrude from the outer sides of the two ends of the positive terminal 310 respectively. Understandably, in this embodiment, the first sealing ring 400 is provided with a first extension 410 and a second extension 420, thereby forming an I-shaped first sealing ring 400. The first extension 410 and the second extension 420 extend and fit against the first and second surfaces of the annular cover plate 300, respectively, which can ensure complete sealing of the inner wall of the first mounting hole 301 and the outer edge of the first mounting hole 301, ensuring the overall sealing of the annular battery, avoiding electrolyte leakage, and improving the overall structural stability and quality of the annular battery. At the same time, the first extension 410 and the second extension 420 can respectively support the two ends of the positive terminal 310, providing a certain degree of protection for the positive terminal 310.

[0030] Please see Figure 2In one embodiment, a second sealing ring 500 is further included. The annular cover plate 300 has a second mounting hole 302, which communicates with the annular groove 102. The second sealing ring 500 is disposed in the second mounting hole 302 and is sealed to the inner sidewall of the second mounting hole 302. The negative terminal 320 is inserted into the second sealing ring 500 and is connected to the negative terminal tab 220. The negative terminal 320 protrudes at least partially from the outer side of the second surface of the annular cover plate 300. Understandably, similarly, by setting a second sealing ring 500 with a hollow ring structure, the second sealing ring 500 is made of insulating rubber material with certain buffering properties to ensure sealing performance. The annular cover plate 300 has a second mounting hole 302 corresponding to the position of the negative electrode tab 220. The second sealing ring 500 is installed in the second mounting hole 302 and seals the inner side wall of the second mounting hole 302. The negative terminal 320 enters the annular groove 102 after being inserted into the sealing ring and abuts against the negative electrode tab 220. Then, the circuit connection between the negative terminal 320 and the negative electrode tab 220 can be achieved through welding, thereby realizing the electrical connection between the negative terminal 320 and the negative electrode tab 220. The negative terminal 320 is set to protrude from the outside of the annular cover plate 300, which facilitates the electrical connection between the negative terminal 320 and external electrical equipment, and has good practicality.

[0031] Please see Figure 1 and Figure 2 In one embodiment, the second sealing ring 500 is provided with a third extension 510 and a fourth extension 520. The third extension 510 and the fourth extension 520 are respectively connected to the first and second surfaces of the annular cover plate 300, and the third extension 510 and the fourth extension 520 protrude from the outer sides of the two ends of the negative terminal 320. Similarly, in this embodiment, the second sealing ring 500 is also configured as an I-shape, with the third extension 510 and the fourth extension 520 extending and fitting against the first and second surfaces of the annular cover plate 300. This ensures complete sealing of the inner wall and outer edge of the second mounting hole 302, ensuring the overall sealing of the annular battery and preventing electrolyte leakage. This improves the overall structural stability and quality of the annular battery. Simultaneously, the third extension 510 and the fourth extension 520 can support the two ends of the negative terminal 320, providing some protection.

[0032] Please see Figure 2 and Figure 3In one embodiment, the positive electrode tab 210 has a plurality of first heat-conducting grooves 211 on the side away from the annular cover plate 300. The first heat-conducting grooves 211 are spaced apart and parallel to each other, and each first heat-conducting groove 211 penetrates both sides of the positive electrode tab 210. The negative electrode tab 220 has a plurality of second heat-conducting grooves 221 on the side away from the annular cover plate 300. The second heat-conducting grooves 221 are spaced apart and parallel to each other, and each second heat-conducting groove 221 penetrates both sides of the negative electrode tab 220. Understandably, the positive electrode tab 210 and the negative electrode tab 220 are respectively provided with first heat-conducting grooves 211 and second heat-conducting grooves 221. Each first heat-conducting groove 211 and each second heat-conducting groove 221 can be set in a strip shape. Each first heat-conducting groove 211 and each second heat-conducting groove 221 can form multiple parallel and spaced heat-conducting channels on the positive electrode tab 210 and the negative electrode tab 220 respectively. Since the positive electrode tab 210 and the negative electrode tab 220 converge when the ring battery is working, The ring battery generates a large amount of heat. The heat from the positive electrode tab 210 and the negative electrode tab 220 can be conducted to the outer sides of the positive electrode tab 210 and the negative electrode tab 220 through the first heat conduction groove 211 and the second heat conduction groove 221, and then quickly conducted to the external environment through the inner side wall of the surrounding through hole 101 and the outer side wall of the bottom shell. This further improves the overall heat dissipation performance of the ring battery, which can meet the requirements of higher energy density and power density, and improves the safety performance and service life of the lithium-ion battery.

[0033] Please see Figure 1 , Figure 2 and Figure 3 In one embodiment, a sealing cap 600 is also included. The annular cap 300 has an injection hole 303, which communicates with the annular groove 102. The sealing cap 600 covers the injection hole 303 and seals it. It is understood that by providing the injection hole 303, electrolyte can be injected into the annular groove 102 in a concentrated manner. The electrolyte wets the annular cell 200, providing a channel for lithium ion migration. Concentrated injection through the injection hole 303 helps prevent electrolyte from splashing out randomly, ensuring the normal operation of the injection process. After injection, the sealing cap 600 seals the injection hole 303. The shape of the sealing cap 600 is adapted to the shape of the injection hole 303, and a sealing connection with the inner wall of the injection hole 303 can be achieved by welding or sealing adhesive, thus achieving a seal.

[0034] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A toroidal battery, characterized in that, include: An annular bottom shell, wherein the middle part of the annular bottom shell has a through hole penetrating the first and second surfaces of the annular bottom shell, and the first surface of the annular bottom shell has an annular groove with an annular opening; A ring-shaped battery cell, wherein the ring-shaped battery cell is disposed within the ring-shaped groove through the ring-shaped slot, and the ring-shaped battery cell is provided with a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab being symmetrically arranged about the central axis of the through hole; and An annular cover plate, the first surface of which is connected to the first surface of the annular bottom shell, is used to close the annular groove, thereby closing the annular recess, and the annular cover plate is connected to the positive electrode tab and the negative electrode tab respectively.

2. The toroidal battery according to claim 1, characterized in that, The width of the through hole is greater than the width of the annular groove.

3. The toroidal battery according to claim 1, characterized in that, The annular cover plate is provided with a positive terminal and a negative terminal, which are symmetrically arranged about the central axis of the through hole. The positive terminal and the negative terminal are respectively connected to the positive electrode tab and the negative electrode tab.

4. The toroidal battery according to claim 3, characterized in that, It also includes a first sealing ring, the annular cover plate has a first mounting hole, the first mounting hole communicates with the annular groove, the first sealing ring is disposed in the first mounting hole and is sealed to the inner side wall of the first mounting hole, the positive terminal is inserted into the first sealing ring and is connected to the positive terminal tab, and the positive terminal at least partially protrudes from the outer side of the second surface of the annular cover plate.

5. The toroidal battery according to claim 4, characterized in that, The first sealing ring is provided with a first extension and a second extension. The first extension and the second extension are respectively connected to the first surface and the second surface of the annular cover plate. The first extension and the second extension protrude from the outer sides of the two ends of the positive terminal.

6. The toroidal battery according to claim 3, characterized in that, It also includes a second sealing ring. The annular cover plate has a second mounting hole, which communicates with the annular groove. The second sealing ring is disposed in the second mounting hole and is sealed to the inner wall of the second mounting hole. The negative terminal is inserted into the second sealing ring and is connected to the negative terminal lug. The negative terminal protrudes at least partially from the outer side of the second surface of the annular cover plate.

7. The toroidal battery according to claim 6, characterized in that, The second sealing ring is provided with a third extension and a fourth extension, which are respectively connected to the first and second surfaces of the annular cover plate, and are respectively protruding from the outer sides of the two ends of the negative terminal.

8. The toroidal battery according to any one of claims 1 to 7, characterized in that, It also includes a sealing cap, the annular cap having an injection hole that communicates with the annular groove, the sealing cap covering the injection hole and sealing it.

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