Cylindrical battery

Abstract

The utility model discloses a cylindrical battery which comprises a steel shell assembly and a bipolar lead-out assembly, the steel shell assembly comprises a shell, a battery cell, a positive tab and a negative tab, the battery cell is arranged in the shell, and the positive tab and the negative tab are respectively arranged on the battery cell; the bipolar lead-out assembly comprises a cover plate, an insulating sleeve group, double rivets and a gasket group, the cover plate is fixedly connected with the shell, a fixing hole group is formed in the cover plate, the insulating sleeve group penetrates through the fixing hole group, and the double rivets penetrate through the insulating sleeve group and the gasket group and then are connected with the positive and negative tabs. According to the utility model, the double rivets are arranged and are separated from the cover plate through the insulating sleeve group, so that the double rivets are respectively connected with the positive electrode and the negative electrode of the battery cell, the positive electrode and the negative electrode of the battery cell are led out at the same side, the metal shell is not connected with the positive / negative plate, the bottom of the shell does not need to be welded, and the problems of corrosion of the metal shell and insufficient welding of the assembly bottom are avoided; and meanwhile, the difficulty of PACK assembly in the subsequent process can be reduced, and the space utilization rate of PACK assembly is improved.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery structure, and to a cylindrical battery, particularly to a cylindrical battery with positive and negative electrodes led out on the same side. Background Technology

[0002] Traditional cylindrical batteries, such as the 18650, have their positive electrode led out through an aluminum cap (with an explosion-proof valve), while the negative electrode is directly welded to the bottom of the steel casing, using the casing as a conductive medium. The positive electrode tab is welded to the inside of the cap, and the negative electrode tab is welded to the bottom of the casing, forming a "one-end-one-end" layout.

[0003] However, in this type of battery structure, because the metal casing connects to the negative electrode, the entire casing becomes the negative output. When the battery voltage drops to extremely low levels (e.g., below 0.1V) due to over-discharge or other abnormalities, the electrochemical potential of the negative electrode becomes high (>2.7V), causing the potential of the metal casing to also become high (since the metal casing connects to the negative electrode, the electrochemical potential of the metal casing equals the electrochemical potential of the negative electrode). At this high electrochemical potential, the metal elements (iron, nickel) in the acidic electrolyte are oxidized to form metal ions, causing the metal casing to dissolve and resulting in battery leakage. Furthermore, in the traditional cylindrical battery assembly process, the bottom welding of the metal casing is prone to incomplete or faulty soldering, which is difficult to detect.

[0004] In this technical solution, the metal casing is not connected to the positive / negative electrode plates, and the bottom of the casing does not need to be welded, thus avoiding the problems of metal casing corrosion and poor welding at the bottom of the assembly. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cylindrical battery.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A cylindrical battery includes: a steel casing assembly and a bipolar lead assembly.

[0008] The steel shell assembly includes a shell, a battery cell, and positive and negative tabs. The battery cell is disposed inside the shell, and the positive and negative tabs are respectively disposed on the battery cell.

[0009] The bipolar lead-out assembly includes a cover plate, an insulating sleeve, double rivets, and a washer assembly. The cover plate is fixedly connected to the housing. The cover plate has a set of fixing holes. The insulating sleeve passes through the set of fixing holes. The double rivets pass through the insulating sleeve and the washer assembly and then connect to the positive and negative electrode ears.

[0010] In one embodiment, the positive and negative tabs include a first tab and a second tab, which are respectively disposed on the battery cell.

[0011] In one embodiment, the first electrode is the positive electrode, and the second electrode is the negative electrode; or

[0012] The first electrode is the negative electrode, and the second electrode is the positive electrode.

[0013] In one embodiment, the fixing hole group includes two fixing through holes, which are spaced apart.

[0014] In one embodiment, the insulating sleeve includes a first insulating kit and a second insulating kit, the first insulating kit being mounted on one of the fixed through holes and the second insulating kit being mounted on the other fixed through hole.

[0015] In one embodiment, the double rivets include a first rivet and a second rivet, the first insulating kit has a first through hole through which the first rivet passes, the second insulating kit has a second through hole through which the second rivet passes.

[0016] In one embodiment, the washer assembly includes a left insulating washer and a right insulating washer, the left insulating washer being fitted onto the first rivet and the right insulating washer being fitted onto the second rivet.

[0017] In one embodiment, a first mounting hole is provided on the left insulating pad, and the first rivet passes through the first mounting hole;

[0018] The right insulating pad has a second mounting hole, and the second rivet passes through the second mounting hole.

[0019] In one embodiment, the first insulating kit has a first clamping groove, and the second insulating kit has a second clamping groove, the first clamping groove and the second clamping groove being used to clamp the cover plate together.

[0020] In one embodiment, the first rivet has a first limiting groove, and the left insulating pad is embedded in the first limiting groove; the second rivet has a second limiting groove, and the right insulating pad is embedded in the second limiting groove.

[0021] The advantages and beneficial effects of this utility model compared to the prior art are as follows:

[0022] This utility model is a cylindrical battery. By setting double rivets and separating them from the cover plate by an insulating sleeve, the double rivets are connected to the positive and negative terminals of the battery cell respectively, so that the positive and negative terminals of the battery cell are led out on the same side. The metal shell is not connected to the positive / negative electrode plates and the bottom of the shell does not need to be welded, thus avoiding the problems of metal shell corrosion and poor welding at the bottom of the assembly. Attached Figure Description

[0023] Figure 1 This is a structural diagram of a cylindrical battery according to one embodiment of the present invention;

[0024] Figure 2 for Figure 1 The diagram shows the structure of a cylindrical battery.

[0025] Figure 3 for Figure 1 A cross-sectional view of the cylindrical battery shown;

[0026] Figure 4 for Figure 3 A partially enlarged cross-sectional view of the cylindrical battery shown.

[0027] The component numbers in the attached diagram are as follows:

[0028] 10. Steel shell assembly; 11. Shell; 12. Battery cell; 13. First tab; 14. Second tab; 20. Bipolar lead-out assembly; 21. Cover plate; 211. Fixing through hole; 22. Insulating sleeve assembly; 221. First insulating kit; 222. First clamping groove; 223. Second insulating kit; 224. Second clamping groove; 23. Double rivet; 231. First rivet; 232. Second rivet; 233. First limiting groove; 234. Second limiting groove; 24. Washer assembly; 241. Left insulating pad; 242. First mounting hole; 243. Right insulating pad; 244. Second mounting hole. Detailed Implementation

[0029] To facilitate understanding of this utility model, a more comprehensive 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.

[0030] Please see Figures 1 to 4 A cylindrical battery includes a steel shell assembly 10 and a bipolar lead assembly 20. It should be noted that the steel shell assembly 10 is used to provide power and protection for the battery; the bipolar lead assembly 20 is used to bring out the bipolar tabs on the same side, making installation more convenient.

[0031] Please see Figure 1The steel shell assembly 10 includes a shell 11, a battery cell 12, and positive and negative tabs. The battery cell 12 is disposed inside the shell 11, and the positive and negative tabs are respectively disposed on the battery cell 12. It should be noted that the shell 11 is used for protection; the battery cell 12 is used for power supply and energy storage of the battery; and the positive and negative tabs are used to lead out the positive and negative electrodes.

[0032] Please see Figure 1 The bipolar lead-out assembly 20 includes a cover plate 21, an insulating sleeve 22, double rivets 23, and a washer assembly 24. The cover plate 21 is fixedly connected to the housing 11. A set of fixing holes is provided on the cover plate 21. The insulating sleeve 22 passes through the fixing holes. The double rivets 23 pass through the insulating sleeve 22 and the washer assembly 24 and then connect to the positive and negative electrode ears. It should be noted that the cover plate 21 is used to install the insulating sleeve 22, double rivets 23, and washer assembly 24; the insulating sleeve 22 is used to insulate the double rivets 23 from the cover plate 21; the double rivets 23 are used to connect the positive and negative electrode ears to achieve simultaneous lead-out of the positive and negative electrode ears; the washer assembly 24 is used to fit over the end of the double rivets 23 to provide a fixing function and stability. In this embodiment, all double rivets 23 are metal rivets.

[0033] Thus, by setting double rivets 23 and separating them from the cover plate 21 by insulating sleeve 22, the double rivets 23 are connected to the positive and negative terminals of the battery cell 12 respectively, so that the positive and negative terminals of the battery cell 12 are led out on the same side. The metal shell is not connected to the positive / negative electrode plates and the bottom of the shell does not need to be welded, which avoids the problems of metal shell corrosion and poor welding at the bottom of the assembly. At the same time, it can also reduce the difficulty of subsequent PACK assembly and improve the space utilization of PACK assembly.

[0034] Please see Figure 2 The positive and negative electrodes include a first electrode 13 and a second electrode 14, which are respectively disposed on the battery cell 12. Further, the first electrode 13 is the positive electrode and the second electrode 14 is the negative electrode; or the first electrode 13 is the negative electrode and the second electrode 14 is the positive electrode. The positive and negative electrodes can be set to positive or negative as needed, and are not limited in this application. Thus, by setting the first electrode 13 and the second electrode 14, the positive and negative electrodes can be led out to achieve external power supply.

[0035] Please see Figure 2 The fixing hole group includes two fixing through holes 211, which are spaced apart. Thus, by providing two fixing through holes 211, the first insulating component 221 and the second insulating component 223 in the insulating sleeve group 22 can be installed respectively.

[0036] Please see Figure 2The insulating sleeve 22 includes a first insulating sleeve 221 and a second insulating sleeve 223. The first insulating sleeve 221 is installed on one of the fixing through holes 211, and the second insulating sleeve 223 is installed on the other fixing through hole 211. Thus, by setting the first insulating sleeve 221 and the second insulating sleeve 223 to pass through the two fixing through holes 211 respectively, the rivet can provide insulation during installation.

[0037] Furthermore, the double rivets 23 include a first rivet 231 and a second rivet 232. A first through hole is formed on the first insulating kit 221, through which the first rivet 231 passes. A second through hole is formed on the second insulating kit 223, through which the second rivet 232 passes. Thus, by providing the first rivet 231 and the second rivet 232, the positive and negative electrodes can be connected after the first insulating kit 221 and the second insulating kit 223 are inserted, achieving same-side positive and negative electrode lead-out, facilitating installation. It should be noted that the same-side layout of the positive and negative electrodes reduces the complexity of connecting the battery cell 12 to the external circuit, eliminating the additional space layout adjustments required for traditional opposite-side lead-out, significantly improving assembly efficiency. The rivets are isolated from the cover plate 21 or the housing 11 by the insulating kit, reducing the insulation treatment steps and further simplifying the production process. Traditional cylindrical batteries have their positive and negative electrodes distributed at both ends, while the same-side lead-out design makes the overall structure of the cell 12 more compact, facilitating high-density integration within a limited space. By riveting the first rivet 231 and the second rivet 232 into the battery casing 11 during assembly, the high-strength connection characteristics of the riveting technology ensure structural stability and avoid redundant volume caused by the dispersed layout of multiple components. The combination of the double rivets 23 and the insulating material effectively prevents short circuits between the positive and negative electrodes, reducing safety risks caused by poor contact or metal fatigue. The integrated same-side lead-out design reduces the number of external connection points, further reducing the probability of failure due to loose interfaces or corrosion.

[0038] Please see Figure 2 and Figure 4 The washer assembly 24 includes a left insulating washer 241 and a right insulating washer 243. The left insulating washer 241 is fitted onto the first rivet 231, and the right insulating washer 243 is fitted onto the second rivet 232. Thus, by providing the left insulating washer 241 and the right insulating washer 243, the first rivet 231 and the second rivet 232 can be installed more securely, resulting in higher structural stability.

[0039] In this embodiment, the left insulating pad 241 has a first mounting hole 242, through which the first rivet 231 passes; the right insulating pad 243 has a second mounting hole 244, through which the second rivet 232 passes. Thus, by providing the first mounting hole 242 and the second mounting hole 244, the first rivet 231 and the second rivet 232 can be respectively mounted to achieve a fixing function.

[0040] Please see Figure 2 and Figure 4 The first insulating kit 221 has a first clamping groove 222, and the second insulating kit 223 has a second clamping groove 224. The first clamping groove 222 and the second clamping groove 224 are used to clamp the cover plate 21 together. The first rivet 231 has a first limiting groove 233, and the left insulating pad 241 is embedded in the first limiting groove 233; the second rivet 232 has a second limiting groove 234, and the right insulating pad 243 is embedded in the second limiting groove 234. Thus, by providing the first clamping groove 222 and the second clamping groove 224 to jointly clamp the cover plate 21, and by providing the first limiting groove 233 and the second limiting groove 234, the installation reliability can be further improved.

[0041] 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 cylindrical battery, characterized in that, include: A steel-shell assembly, comprising a shell, a battery cell, and positive and negative tabs, wherein the battery cell is disposed within the shell, and the positive and negative tabs are respectively disposed on the battery cell; A bipolar lead-out assembly includes a cover plate, an insulating sleeve, two rivets, and a washer assembly. The cover plate is fixedly connected to the housing. The cover plate has a set of fixing holes. The insulating sleeve passes through the set of fixing holes. The two rivets pass through the insulating sleeve and the washer assembly and are then connected to the positive and negative electrode ears.

2. The cylindrical battery according to claim 1, characterized in that, The positive and negative tabs include a first tab and a second tab, which are respectively disposed on the battery cell.

3. The cylindrical battery according to claim 2, characterized in that, The first electrode is the positive electrode, and the second electrode is the negative electrode; or The first electrode is the negative electrode, and the second electrode is the positive electrode.

4. The cylindrical battery according to claim 1, characterized in that, The fixing hole group includes two fixing through holes, which are spaced apart.

5. The cylindrical battery according to claim 4, characterized in that, The insulating sleeve assembly includes a first insulating kit and a second insulating kit, wherein the first insulating kit is installed on one of the fixed through holes and the second insulating kit is installed on the other fixed through hole.

6. The cylindrical battery according to claim 5, characterized in that, The double rivets include a first rivet and a second rivet. The first insulating kit has a first through hole through which the first rivet passes. The second insulating kit has a second through hole through which the second rivet passes.

7. The cylindrical battery according to claim 6, characterized in that, The washer assembly includes a left insulating washer and a right insulating washer, the left insulating washer being fitted onto the first rivet and the right insulating washer being fitted onto the second rivet.

8. The cylindrical battery according to claim 7, characterized in that, The left insulating pad has a first mounting hole, and the first rivet passes through the first mounting hole; The right insulating pad has a second mounting hole, and the second rivet passes through the second mounting hole.

9. The cylindrical battery according to claim 5, characterized in that, The first insulating kit has a first clamping groove, and the second insulating kit has a second clamping groove. The first clamping groove and the second clamping groove are used to clamp the cover plate together.

10. The cylindrical battery according to claim 7, characterized in that, The first rivet has a first limiting groove, and the left insulating pad is embedded in the first limiting groove; the second rivet has a second limiting groove, and the right insulating pad is embedded in the second limiting groove.

Images