Cylindrical battery and battery module

Abstract

The invention relates to a cylindrical battery and a battery module. Relates to the technical field of new energy batteries. The battery specifically comprises a battery shell, a roll core arranged in the battery shell, a first connecting piece arranged at the bottom of the roll core, a first connecting piece arranged at the top of the roll core, a top cover which is fixedly connected and conducted with the battery shell, and a pole arranged at the top of the roll core, the first pole of the roll core is conducted with the battery shell through the first connecting piece, the pole is insulated from the top cover, and the second pole of the roll core is conducted with the pole through the first connecting piece. According to the cylindrical battery, the first pole of the roll core is led out through the top cover, and the second pole of the roll core is led out through the pole column, so that the first pole and the second pole of the cylindrical battery are both positioned at the top end of the battery shell, and the first pole and the second pole can be connected at the tops of a plurality of cylindrical batteries in a battery grouping process; therefore, the integration operation of a large number of cylindrical batteries is simpler and more convenient, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a cylindrical battery and a battery module. Background Art

[0002] At present, with the rapid development of the new energy industry, society's requirements for the energy density, safety performance, fast charging and other performance of lithium-ion batteries have been further improved. As a highly recognized solution, large cylindrical batteries have ushered in a broad market space.

[0003] Cylindrical batteries are used as power sources for various electronic devices. When the power requirements of electronic devices are relatively small, only a few single cylindrical batteries are needed to be simply connected in series and parallel. However, when cylindrical batteries are used in new energy vehicles as a power source, a large number of cylindrical batteries need to be integrated into battery modules as a power source. When designing battery modules, technicians must consider the ease of operation of a large number of cylindrical batteries during the integration process.

[0004] In the prior art, the first pole and the second pole of a cylindrical battery are usually located at the two ends of a battery shell. Therefore, during the battery grouping process, it is necessary to connect multiple first poles of cylindrical batteries at one end of the battery shell, and connect multiple second poles of cylindrical batteries at the other end of the battery shell, which makes the integration operation of a large number of cylindrical batteries more complicated and reduces production efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a cylindrical battery and a battery module to address the deficiencies of the above-mentioned prior art, which can make the integration operation of a large number of cylindrical batteries simpler and more convenient, thereby improving production efficiency and reducing production costs.

[0006] The present invention proposes a cylindrical battery, comprising a battery shell, a winding core arranged in the battery shell, a first connecting piece arranged at the bottom of the winding core, a second connecting piece arranged at the top of the winding core, a top cover fixedly connected to and connected to the battery shell, and a pole arranged at the top of the winding core; the first connecting piece connects the first pole of the winding core to the battery shell, the pole is insulated from the top cover, and the second connecting piece connects the second pole of the winding core to the pole.

[0007] Furthermore, the top cover includes a cover plate body fixedly connected to and conductive with the battery housing, a pole groove is provided on the cover plate body, and the pole includes a main body fixedly installed in the pole groove.

[0008] Furthermore, the top cover also includes a sealing ring and an upper plastic, wherein the sealing ring is arranged at the bottom of the pole groove, and the upper plastic is arranged between the main body and the pole groove.

[0009] Furthermore, the cylindrical battery also includes an insulating pad, which is arranged between the second connecting piece and the top cover. The pole also includes a first boss arranged on the second connecting piece. After the first boss passes through the insulating pad, it is fixedly connected to the main body.

[0010] Furthermore, a first notch is provided on the second connecting sheet, the first notch divides the second connecting sheet into a second pole connecting portion and a pole connecting portion, the second pole connecting portion is fixedly connected to the second pole of the winding core, and the first boss is arranged at the center position of the pole connecting portion.

[0011] Furthermore, a second notch is provided on the first connecting sheet, and the second notch divides the first connecting sheet into a first pole connecting portion and a shell connecting portion, the first pole connecting portion is fixedly connected to the first pole of the winding core, and the shell connecting portion is fixedly connected to the bottom wall of the battery shell.

[0012] Furthermore, a second boss and a third boss are provided at the bottom of the shell connecting portion, the second boss is provided at the center position of the bottom of the shell connecting portion, the third boss is provided at an eccentric position of the bottom of the shell connecting portion, the second boss is fixedly connected to the bottom wall of the battery shell, and the third boss is fitted with the bottom wall of the battery shell.

[0013] Furthermore, a liquid injection hole is provided at the bottom of the battery housing, and the liquid injection hole connects the interior of the battery housing with the outside.

[0014] Furthermore, a first step and a second step are provided at the bottom of the battery shell, and the first step and the second step are sequentially arranged on the outer side of the injection hole. The cylindrical battery also includes an explosion-proof valve fixedly installed on the first step, and a protective film fixedly installed on the second step.

[0015] The present invention also proposes a battery module, comprising the above-mentioned cylindrical battery, and also comprising a bus, a first total pole piece and a second total pole piece, a plurality of the cylindrical batteries are arranged in an array, the bus connects the top cover and the pole of two adjacent cylindrical batteries, the first total pole piece is connected to the top cover of the cylindrical battery at the head end, and the second total pole piece is connected to the pole of the cylindrical battery at the tail end.

[0016] The cylindrical battery and battery module proposed by the present invention have the following beneficial effects: (1) The cylindrical battery leads out the first pole of the winding core through the top cover, and the pole leads out the second pole of the winding core, so that the first pole and the second pole of the cylindrical battery are both located at the top of the battery shell. Therefore, in the process of battery grouping, the first pole and the second pole can be connected at the top of multiple cylindrical batteries, so that the integration operation of a large number of cylindrical batteries is simpler and more convenient, which improves production efficiency and reduces production costs; (2) The pole of the cylindrical battery includes a main body, a pole groove is provided on the cover body, the main body is fixedly installed in the pole groove, the second pole of the winding core is connected to the pole through a first connecting piece provided on the top of the winding core, so that the second pole current is transmitted to the pole through the first connecting piece, and then the second pole of the winding core is led out through the main body fixedly installed in the pole groove, thereby realizing the lead-out of the second pole of the winding core; (3) The top cover of the cylindrical battery also includes a sealing ring and an upper plastic. The sealing ring is arranged at the bottom of the electrode groove to seal the gap between the main body and the electrode groove. The upper plastic is located between the main body and the electrode groove, so that the main body is separated from the cover body by the upper plastic, and the main body and the cover body are insulated to prevent the main body from directly contacting the cover body, which may cause a short circuit in the cylindrical battery. (4) The cylindrical battery further includes an insulating pad. When the cover plate body is fixedly connected to the top of the battery housing, the insulating pad is disposed between the cover plate body and the first connecting piece at the top of the winding core, thereby separating the first connecting piece from the cover plate body through the insulating pad, insulating the first connecting piece from the cover plate body, and preventing the cover plate body from directly contacting the first connecting piece, thereby causing a short circuit in the cylindrical battery. (5) A first notch is provided on the first connecting sheet of the cylindrical battery, and the first notch divides the first connecting sheet into a second pole connecting portion and a pole connecting portion. When the cylindrical battery vibrates or impacts, the elastic deformation of the second pole connecting portion can buffer the vibration or impact of the cylindrical battery, and prevent the connection point between the second pole connecting portion and the winding core, and the connection point between the first boss and the main body from being pulled, thereby ensuring the performance of the cylindrical battery; (6) A second notch is provided on the first connecting sheet of the cylindrical battery, and the second notch divides the first connecting sheet into a first pole connecting portion and a shell connecting portion. When the cylindrical battery vibrates or impacts, the elastic deformation of the first pole connecting portion can buffer the vibration or impact of the cylindrical battery, and prevent the connection point between the first pole connecting portion and the winding core, and the connection point between the shell connecting portion and the battery shell from being pulled, thereby ensuring the performance of the cylindrical battery; (7) A second boss and a plurality of third bosses are provided at the bottom of the shell connection portion of the cylindrical battery, wherein the second boss is provided at the center position of the bottom of the shell connection portion, and the third boss is provided at the eccentric position of the bottom of the shell connection portion. When the second boss is welded to the bottom wall of the battery shell, the plurality of third bosses are simultaneously attached to the bottom wall of the battery shell, so that the plurality of third bosses simultaneously support the eccentric position of the shell connection portion, further improving the stability of the cylindrical battery structure; (8) The cylindrical battery has an explosion-proof valve at the bottom of the battery shell. When the cylindrical battery has thermal runaway, the gas in the battery shell can better act on the explosion-proof valve, thereby releasing the gas through the explosion-proof valve, reducing the internal pressure of the battery shell, and better ensuring the safety performance of the cylindrical battery. (9) The first main electrode piece of the battery module is connected to the top cover of the first cylindrical battery at the head end, the bus connects the poles of two adjacent cylindrical batteries to the top cover, and the second main electrode piece is connected to the pole of the last cylindrical battery at the tail end, so that the first poles of multiple cylindrical batteries arranged in an array are led out through the first main electrode piece, and the second main electrode piece leads out the first poles of multiple cylindrical batteries arranged in an array, thereby making the integration operation of a large number of cylindrical batteries simpler and more convenient, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In the accompanying drawings, like reference numerals are used to represent like elements.

[0018] Figure 1 A schematic cross-sectional view of a cylindrical battery according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a cylindrical battery according to an embodiment of the present invention; Figure 3 This is an exploded schematic diagram of the top of a battery casing of a cylindrical battery according to an embodiment of the present invention; Figure 4 It is a schematic diagram of an explosion of the bottom of a battery casing of a cylindrical battery according to an embodiment of the present invention; Figure 5 An exploded schematic diagram of a main body of a cylindrical battery according to an embodiment of the present invention being installed on a top cover; Figure 6 It is a cross-sectional schematic diagram of a main body of a cylindrical battery installed on a top cover according to an embodiment of the present invention; Figure 7 This is a schematic structural diagram of a cylindrical battery according to an embodiment of the present invention, in which a first boss is disposed on a first connecting sheet; Figure 8 This is a schematic structural diagram of a second connecting piece of a cylindrical battery according to an embodiment of the present invention; Fig. 9 The figure is a schematic structural diagram of a battery module according to an embodiment of the present invention.

[0019] In the figure: 1. cylindrical battery; 10. battery shell; 101. injection hole; 102. first step; 103. second step; 11. winding core; 12. first connecting piece; 121. second notch; 122. first pole connection part; 123. shell connection part; 1231. second boss; 1232. third boss; 13. second connecting piece; 131. first notch; 132. second pole connection part; 133. pole connection part; 14. top cover; 141. cover body; 1411. pole groove; 142. sealing ring; 143. upper plastic; 15. pole; 151. main body; 152. first boss; 16. insulating pad; 17. explosion-proof valve; 18. protective film; 2. bus; 3. first total pole piece; 4. second total pole piece. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] See also Figures 1 to 9 A cylindrical battery 1 according to an embodiment of the present invention comprises a battery housing 10, a winding core 11 arranged in the battery housing 10, a first connecting piece 12 arranged at the bottom of the winding core 11, a second connecting piece 13 arranged at the top of the winding core 11, a top cover 14 fixedly connected to and connected with the battery housing 10, and a pole 15 arranged at the top of the winding core 11; the first connecting piece 12 connects the first pole of the winding core 11 to the battery housing 10, the pole 15 is insulated from the top cover 14, and the second connecting piece 13 connects the second pole of the winding core 11 to the pole 15.

[0022] In the present application, the cylindrical battery 1 includes a battery case 10, a winding core 11, a first connecting piece 12, a second connecting piece 13, a top cover 14 and a pole 15. The winding core 11 is arranged in the battery case 10, the first connecting piece 12 is arranged at the bottom of the winding core 11, the second connecting piece 13 is arranged at the top of the winding core 11, the top cover 14 is fixedly connected and conductive to the top of the battery case 10, and the pole 15 is also arranged on the top of the winding core 11.

[0023] The first pole of the winding core 11 is connected to the bottom of the battery housing 10 through the first connecting piece 12, so that the first pole of the winding core 11 is connected to the battery housing 10, and then the first pole of the winding core 11 is led out through the top cover 14 fixedly installed on the top of the battery housing 10, that is, the top cover 14 serves as the first pole of the cylindrical battery 1; the second connecting piece 13 connects the second pole of the winding core 11 to the pole 15, so that the second pole of the winding core 11 is connected to the pole 15, and the second pole of the winding core 11 is led out through the pole 15, that is, the pole 15 serves as the second pole of the cylindrical battery 1.

[0024] In the prior art, the first pole and the second pole of the cylindrical battery 1 are usually located at the two ends of the battery shell 10. Therefore, during the battery grouping process, it is necessary to connect the first poles of multiple cylindrical batteries 1 at one end of the battery shell 10, and connect the second poles of multiple cylindrical batteries 1 at the other end of the battery shell 10, which makes the integration operation of a large number of cylindrical batteries 1 more complicated and reduces production efficiency.

[0025] In the present application, since the top cover 14 is fixedly mounted on the top of the battery housing 10, the pole 15 is also located at the top of the battery housing 10, that is, the first pole and the second pole of the cylindrical battery 1 are both located at the top of the battery housing 10. Therefore, in the process of battery grouping, the first pole and the second pole can be connected at the top of multiple cylindrical batteries 1 at the same time, thereby making the integration operation of a large number of cylindrical batteries 1 simpler and more convenient, improving production efficiency and reducing production costs.

[0026] In an embodiment of the present invention, a battery module is also provided, comprising a plurality of the above-mentioned cylindrical batteries 1, which are arranged in an array. It also comprises a busbar 2, a first total pole piece 3 and a second total pole piece 4. Since the top cover 14 of the cylindrical battery 1 is the first pole of the cylindrical battery 1, the pole 15 is the second pole of the cylindrical battery 1.

[0027] Therefore, in the process of battery grouping, the poles 15 of two adjacent cylindrical batteries 1 are connected to the top cover 14 at the top of two adjacent cylindrical batteries 1 through the bus 2, so as to realize the series connection of two adjacent cylindrical batteries 1, that is, the two adjacent cylindrical batteries 1 are connected in series through multiple bus bars 2 respectively, so as to realize the series connection of multiple cylindrical batteries 1 arranged in an array.

[0028] Then, the first total electrode piece 3 is connected to the top cover 14 of the first cylindrical battery 1 at the head end to lead out the first poles of the plurality of cylindrical batteries 1 connected in series; the second total electrode piece 4 is connected to the pole 15 of the last cylindrical battery 1 at the tail end to lead out the second poles of the plurality of cylindrical batteries 1 connected in series, thereby making the integrated operation of a large number of cylindrical batteries 1 simpler and more convenient, and improving the production efficiency.

[0029] Embodiment 1: In this embodiment, the first pole of the winding core 11 is the positive pole, and the second pole is the negative pole, that is, the positive pole of the winding core 11 is located at the bottom of the winding core 11, and the negative pole of the winding core 11 is located at the top of the winding core 11. The positive pole of the winding core 11 is connected to the battery housing 10 through the first connecting sheet 12, so that the battery housing 10 is positively charged; and then connected to the battery housing 10 through the top cover 14, so that the top cover 14 is positively charged, so that the positive pole of the winding core 11 is led out through the top cover 14, that is, the top cover 14 serves as the positive pole of the cylindrical battery 1.

[0030] The negative electrode of the winding core 11 is connected to the pole 15 through the second connecting piece 13, so that the pole 15 is negatively charged, and the pole 15 is insulated from the top cover 14, so that the negative electrode of the winding core 11 is led out through the pole, that is, the pole 15 serves as the negative electrode of the cylindrical battery 1.

[0031] In the process of battery grouping, the poles 15 of two adjacent cylindrical batteries 1 are connected to the top cover 14 at the top of two adjacent cylindrical batteries 1 through multiple bus bars 2, so that the multiple cylindrical batteries 1 arranged in an array are connected in series; then, the first total pole piece 3 is connected to the top cover 14 of the cylindrical battery 1 at the head end to lead out the positive poles of the multiple cylindrical batteries 1 connected in series; the second total pole piece 4 is connected to the pole 15 of the last cylindrical battery 1 at the tail end to lead out the negative poles of the multiple cylindrical batteries 1 connected in series, thereby making the integration operation of a large number of cylindrical batteries 1 simpler and more convenient, and improving production efficiency.

[0032] Embodiment 2: In this embodiment, the first pole of the winding core 11 is a negative pole, and the second pole is a positive pole, that is, the negative pole of the winding core 11 is located at the bottom of the winding core 11, and the positive pole of the winding core 11 is located at the top of the winding core 11. The negative pole of the winding core 11 is connected to the battery housing 10 through the first connecting sheet 12, so that the battery housing 10 is negatively charged; and then connected to the battery housing 10 through the top cover 14, so that the top cover 14 is negatively charged, so that the negative pole of the winding core 11 is led out through the top cover 14, that is, the top cover 14 serves as the negative pole of the cylindrical battery 1.

[0033] The positive electrode of the winding core 11 is connected to the pole 15 through the second connecting piece 13, so that the pole 15 is positively charged, and the pole 15 is insulated from the top cover 14, so that the positive electrode of the winding core 11 is led out through the pole, that is, the pole 15 serves as the positive electrode of the cylindrical battery 1.

[0034] In the process of battery grouping, the poles 15 of two adjacent cylindrical batteries 1 are connected to the top cover 14 at the top of two adjacent cylindrical batteries 1 through multiple bus bars 2, so that the multiple cylindrical batteries 1 arranged in an array are connected in series; then, the first total electrode piece 3 is connected to the top cover 14 of the cylindrical battery 1 at the head end to lead out the negative poles of the multiple cylindrical batteries 1 connected in series; the second total electrode piece 4 is connected to the pole 15 of the last cylindrical battery 1 at the tail end to lead out the positive poles of the multiple cylindrical batteries 1 connected in series, thereby making the integration operation of a large number of cylindrical batteries 1 simpler and more convenient, and improving production efficiency.

[0035] In the present application, since the battery shell 10 is positively or negatively charged, it can be foreseen that: in actual implementation, an insulating sleeve is provided on the outside of the battery shell 10 of the cylindrical battery, and the battery shell 10 is insulated by the insulating sleeve, thereby preventing the battery shell 10 from being charged and affecting the use of the cylindrical battery 1 and the integrated operation.

[0036] In this embodiment, the top cover 14 includes a cover body 141 fixedly connected to the battery housing 10, a pole groove 1411 is provided on the cover body 141, and the pole 15 includes a main body fixedly installed in the pole groove 1411. In the present application, a cavity is provided in the battery housing 10, and the top of the cavity is open, so that the winding core 11, the first connecting piece 12 and the second connecting piece 13 can be placed in the cavity of the battery housing 10 through the top opening of the cavity.

[0037] In the present application, the top cover 14 includes a cover body 141, which is fixedly connected to the top of the battery housing 10 through the cover body 141, so that the cover body 141 closes the top opening of the battery housing 10 cavity, so that the battery housing 10 forms a closed housing, and the cover body 141 is conductive with the battery housing 10. Therefore, when the first connecting piece 12 connects the first pole of the winding core 11 to the bottom of the battery housing 10, the current of the first pole is transmitted to the battery housing 10 through the first connecting piece 12, and then transmitted to the cover body 141 through the battery housing 10, so that the first pole of the winding core 11 is led out through the cover body 141, thereby realizing the lead-out of the first pole of the winding core 11.

[0038] The pole 15 includes a main body 151, and a pole groove 1411 is provided on the cover body 141. The main body 151 is fixedly installed in the pole groove 1411. The second pole of the winding core 11 is connected to the pole 15 through the second connecting piece 13 provided on the top of the winding core 11, so that the second pole current is transmitted to the pole 15 through the second connecting piece 13, and then the second pole of the winding core 11 is led out through the main body 151 fixedly installed in the pole groove 1411, thereby realizing the lead-out of the second pole of the winding core 11.

[0039] In actual implementation, when the main body 151 is fixedly installed in the pole groove 1411, the top of the main body 151 can extend above the cover body 141, so that the top of the main body 151 leads out the second pole of the winding core 11, which is convenient for fixing the bus 2 and the second total pole piece 4 with the top of the main body 151 during the battery module integration operation, thereby making the integration operation of a large number of cylindrical batteries 1 simpler and more convenient, and improving production efficiency.

[0040] In the present application, the first pole of the cylindrical battery 1 is led out through the cover body 141, and the second pole of the cylindrical battery 1 is led out through the main body 151. Therefore, when the main body 151 is fixedly installed in the pole groove 1411, the main body 151 and the cover body 141 need to be insulated to avoid direct contact between the main body 151 and the cover body 141, which may cause a short circuit in the cylindrical battery 1.

[0041] Therefore, in this embodiment, the top cover 14 also includes a sealing ring 142 and an upper plastic 143. The sealing ring 142 is arranged at the bottom of the pole groove 1411, and is used to seal the gap between the main body 151 and the pole groove 1411 when the main body 151 is fixedly installed in the pole groove 1411, and at the same time insulate the bottom of the main body 151 from the cover body 141.

[0042] The upper plastic 143 is arranged on the periphery of the main body 151 so that the upper plastic 143 is located between the main body 151 and the pole groove 1411, so that the main body 151 is separated from the cover body 141 by the upper plastic 143, and the periphery of the main body 151 is insulated from the cover body 141, so as to prevent the main body 151 from directly contacting the cover body 141, resulting in a short circuit of the cylindrical battery 1.

[0043] Specifically, in the actual implementation process, when assembling the top cover 14, first install the sealing ring 142 into the bottom boss of the pole groove 1411 from the top of the cover body 141, and then assemble the main body 151 and the upper plastic 143 so that the upper plastic 143 is located on the outer periphery of the main body 151, and then install the assembled main body 151 and the upper plastic 143 into the pole groove 1411 from the top of the cover body 141, so that the bottom of the main body 151 abuts against the top of the sealing ring 142, and the bottom of the upper plastic 143 abuts against the bottom boss of the pole groove 1411.

[0044] Finally, the inner wall of the pole groove 1411 extending vertically upward at the top of the cover body 141 is folded to extend in the horizontal direction by means of riveting or the like, so that the inner wall of the pole groove 141 is pressed against the top of the upper plastic 143, thereby fixing the sealing ring 142, the upper plastic 143 and the main body 151 on the cover body 141, and completing the assembly of the main body 151 on the top cover 14.

[0045] In this embodiment, the cylindrical battery 1 further includes an insulating pad 16, which is disposed between the second connecting piece 13 and the top cover 14. The pole 15 further includes a first boss 152 disposed on the second connecting piece 13. The first boss 152 passes through the insulating pad 16 and is fixedly connected to the main body 151.

[0046] In the present application, the second pole of the winding core 11 is connected to the pole 15 by the second connecting piece 13 arranged on the top of the winding core 11, so that the current of the second pole is transmitted to the pole 15 through the second connecting piece 13. Therefore, when the cover body 141 is fixedly connected to the top of the battery shell 10, the second connecting piece 13 and the cover body 141 also need to be insulated to avoid direct contact between the cover body 141 and the second connecting piece 13, which would cause a short circuit in the cylindrical battery 1.

[0047] Therefore, in the present application, the cylindrical battery 1 also includes an insulating pad 16. When the cover body 141 is fixedly connected to the top of the battery housing 10, the insulating pad 16 is arranged between the cover body 141 and the second connecting piece 13 at the top of the winding core 11, so that the second connecting piece 13 is separated from the cover body 141 by the insulating pad 16, and the second connecting piece 13 is insulated from the cover body 141, so as to prevent the cover body 141 from directly contacting the second connecting piece 13, thereby causing a short circuit in the cylindrical battery 1.

[0048] Since the second connecting piece 13 also needs to be connected to the pole 15, the pole 15 also includes a first boss 152 arranged on the top of the second connecting piece 13. After the first boss 152 passes through the insulating pad 16, it extends into the pole groove 1411 from the bottom of the pole groove 1411, and after passing through the sealing ring 142, it contacts the bottom of the main body 151, thereby fixedly connected to the second pole of the winding core 11 through the second connecting piece 13, and the first boss 152 is fixedly connected to the main body 151, so that the second connecting piece 13 connects the second pole of the winding core 11 with the pole 15.

[0049] In this embodiment, a first notch 131 is provided on the second connecting piece 13, and the first notch 131 divides the second connecting piece 13 into a second pole connecting portion 132 and a pole connecting portion 133, and the first boss 152 is arranged at the center of the top of the pole connecting portion 133. The second pole connecting portion 132 is fixedly connected to the second pole of the winding core 11, and the first boss 152 is fixedly connected to the main body 151, so that the second connecting piece 13 conducts the second pole of the winding core 11 with the pole 15, and then the second pole of the winding core 11 is led out through the main body 151 of the pole 15.

[0050] In the present application, when the second connecting sheet 13 is divided into the second pole connection part 132 and the pole connection part 133 by the first notch 131, the second connecting sheet 13 is not completely cut off, that is, the tail end of the second pole connection part 132 is integrated with the pole connection part 133, and the head end of the second pole connection part 132 is separated from the pole connection part 133, so that the head end of the second pole connection part 132 is fixedly connected to the second pole of the winding core 11, so that the second pole current is transmitted to the pole connection part 133 through the tail end of the second pole connection part 132, and then transmitted to the pole 15 by the pole connection part 133.

[0051] At the same time, since the head end of the second pole connecting portion 132 fixedly connected to the second pole of the winding wire is separated from the pole connecting portion 133, when the cylindrical battery 1 vibrates or impacts, the elastic deformation of the second pole connecting portion 132 can buffer the vibration or impact of the cylindrical battery 1, and prevent the connection point between the second pole connecting portion 132 and the winding core 11, and the connection point between the first boss 152 and the main body 151 from being pulled, thereby causing the connection between the second connecting piece 13 and the winding core 11, and the connection between the first boss 152 and the main body 151 to be disconnected, affecting the performance of the cylindrical battery 1.

[0052] Specifically, in actual implementation, welding can be used to fix the second connecting piece 13 and the winding core 11, and the first boss 152 and the main body 151, that is, the head end of the second pole connecting part 132 is welded to the second pole of the winding core 11, and the first boss 152 is welded to the main body 151.

[0053] The head end of the second pole connecting portion 132 is separated from the pole connecting portion 133 by the first notch 131. When the cylindrical battery 1 vibrates or impacts, the elastic deformation of the second pole connecting portion 132 can buffer the vibration or impact of the cylindrical battery 1, and prevent the welding point between the second connecting piece 13 and the winding core 11, and the welding point between the first boss 152 and the main body 151 from being pulled, thereby causing the welding point between the second connecting piece 13 and the winding core 11, and the welding point between the first boss 152 and the main body 151 to fall off, affecting the performance of the cylindrical battery 1.

[0054] Similarly, in this embodiment, a second notch 121 is provided on the first connecting sheet 12, and the second notch 121 divides the first connecting sheet 12 into a first pole connecting portion 122 and a shell connecting portion 123. The first pole connecting portion 122 is fixedly connected to the first pole of the winding core 11, and the shell connecting portion 123 is fixedly connected to the bottom wall of the battery shell 10, so that the first connecting sheet 12 conducts the first pole of the winding core 11 with the battery shell 10, and then transmits the first pole current to the cover plate body 141 through the battery shell 10, so that the cover plate body 141 leads the first pole of the winding core 11 out.

[0055] In the present application, when the first connecting sheet 12 is divided into the first pole connecting portion 122 and the shell connecting portion 123 by the second notch 121, the first connecting sheet 12 is not completely cut off, that is, the tail end of the first pole connecting portion 122 is integrated with the shell connecting portion 123, and the head end of the first pole connecting portion 122 is separated from the shell connecting portion 123, so that the first pole current is transmitted to the shell connecting portion 123 through the tail end of the first pole connecting portion 122, and then transmitted to the battery shell 10 by the shell connecting portion 123.

[0056] At the same time, since the head end of the first pole connecting portion 122 fixedly connected to the first pole of the winding wire is separated from the shell connecting portion 123, when the cylindrical battery 1 vibrates or impacts, the elastic deformation of the first pole connecting portion 122 can buffer the vibration or impact of the cylindrical battery 1, and prevent pulling on the connection point between the first pole connecting portion 122 and the winding core 11, and the connection point between the shell connecting portion 123 and the battery shell 10, thereby causing the connection between the first connecting piece 12 and the winding core 11, and the connection between the first connecting piece 12 and the battery shell 10 to be disconnected, affecting the performance of the cylindrical battery 1.

[0057] Specifically, in actual implementation, welding can be used to fix the battery shell 10 and the winding core 11, and the battery shells 10 and the battery shells 10, that is, the head end of the first pole connecting part 122 is welded to the first pole of the winding core 11, and the shell connecting part 123 is welded to the battery shell 10.

[0058] The head end of the first pole connecting portion 122 is separated from the shell connecting portion 123 by the second notch 121. When the cylindrical battery 1 vibrates or impacts, the elastic deformation of the first pole connecting portion 122 can buffer the vibration or impact of the cylindrical battery 1, and prevent the welding points between the first pole connecting portion 122 and the winding core 11, and the welding points between the shell connecting portion 123 and the battery casing 10 from being pulled, thereby causing the welding points between the first connecting piece 12 and the winding core 11, and the welding points between the first connecting piece 12 and the battery casing 10 to fall off, affecting the performance of the cylindrical battery 1.

[0059] In specific operations, a plurality of first notches 131 can be arranged at equal distances along the circumferential direction on the second connecting sheet 13, thereby dividing a plurality of second pole connecting portions 132 on the second connecting sheet 13, and the head ends of the plurality of second pole connecting portions 132 are welded to the second pole of the winding core 11 at the same time, which not only enhances the connection strength between the second connecting sheet 13 and the winding core 11 and improves the current carrying capacity of the second connecting sheet 13, but also can better buffer the vibration or impact of the cylindrical battery 1, thereby ensuring the performance of the cylindrical battery 1.

[0060] The first connecting sheet 12 is provided with a plurality of second notches 121 at equal intervals along the circumferential direction, thereby dividing a plurality of first pole connecting portions 122 on the first connecting sheet 12, and the head ends of the plurality of first pole connecting portions 122 are welded to the first pole of the winding core 11 at the same time, which not only enhances the connection strength between the first connecting sheet 12 and the winding core 11 and improves the current carrying capacity of the first connecting sheet 12, but also can better buffer the vibration or impact of the cylindrical battery 1, thereby ensuring the performance of the cylindrical battery 1.

[0061] Since in the present application, the first pole of the winding core 11 is arranged at the bottom of the winding core 11, when the first connecting piece 12 connects the first pole of the winding core 11 to the bottom of the battery shell 10, the top of the first pole connecting part 122 is welded to the first pole of the winding core 11, and the bottom of the shell connecting part 123 is welded to the bottom wall of the battery shell 10.

[0062] In this embodiment, a second boss 1231 and a third boss 1232 are provided at the bottom of the shell connecting portion 123, wherein the second boss 1231 is arranged at the center position of the bottom of the shell connecting portion 123, and the third boss 1232 is arranged at an eccentric position at the bottom of the shell connecting portion 123. The second boss 1231 at the center position of the bottom of the shell connecting portion 123 is welded to the bottom wall of the battery shell 10 to achieve a fixed connection between the shell connecting portion 123 and the battery shell 10.

[0063] The third boss 1232 located at the eccentric position at the bottom of the shell connecting part 123 fits against the bottom wall of the battery shell 10, so that the eccentric position of the shell connecting part 123 is supported by the third boss 1232 to prevent the shell connecting part 123 from being deformed under the gravity of the winding core 11, thereby improving the stability of the structure of the cylindrical battery 1.

[0064] In actual implementation, a plurality of third bosses 1232 can be arranged at equal distances along the circumference of the second boss 1231 at the bottom of the shell connecting portion 123. When the second boss 1231 is welded to the bottom wall of the battery shell 10, the plurality of third bosses 1232 are simultaneously fitted to the bottom wall of the battery shell 10, so that the plurality of third bosses 1232 simultaneously support the eccentric position of the shell connecting portion 123, further improving the stability of the structure of the cylindrical battery 1.

[0065] In this embodiment, a liquid injection hole 101 is provided at the bottom of the battery housing 10, and the liquid injection hole 101 connects the inside of the battery housing 10 with the outside, so that electrolyte can be injected into the battery housing 10 through the liquid injection hole 101, so that the electrolyte immerses the winding core 11 in the battery housing 10, thereby ensuring the normal use of the cylindrical battery 1.

[0066] In this embodiment, the bottom of the battery housing 10 is further provided with a first step 102 and a second step 103, and the first step 102 and the second step 103 are sequentially arranged outside the injection hole 101. The cylindrical battery 1 also includes an explosion-proof valve 17, which is fixedly mounted on the first step 102 so that the explosion-proof valve 17 is located outside the injection hole 101. When the cylindrical battery 1 generates thermal runaway, a large amount of gas is generated in the battery housing 10, which increases the internal pressure of the battery housing 10. At this time, the gas in the battery housing 10 can act on the explosion-proof valve 17, and the gas is released through the explosion-proof valve 17, thereby reducing the internal pressure of the battery housing 10, preventing the cylindrical battery 1 from exploding and causing a safety accident.

[0067] Since the battery housing 10 is vertically arranged and the winding core 11 is vertically arranged in the battery housing 10, the present application arranges the explosion-proof valve 17 at the bottom of the battery housing 10. When the cylindrical battery 1 produces thermal runaway, the gas in the battery housing 10 can better act on the explosion-proof valve 17, thereby releasing the gas through the explosion-proof valve 17, reducing the internal pressure of the battery housing 10, and better ensuring the safety performance of the cylindrical battery 1.

[0068] In the present application, the cylindrical battery 1 also includes a protective film 18. By fixing the protective film 18 on the second step 103, the protective film 18 is located on the outside of the explosion-proof valve 17, so that the explosion-proof valve 17 is protected by the protective film 18 to prevent sharp objects from damaging the explosion-proof valve 17 and affecting the use of the explosion-proof valve 17. It can also prevent foreign matter, dust, etc. from falling into the explosion-proof valve 17 and affecting the use of the explosion-proof valve 17, thereby making the safety performance of the cylindrical battery 1 better.

[0069] The contents described above may be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present invention.

[0070] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cylindrical battery, characterized in that: The invention comprises a battery housing (10), a winding core (11) arranged in the battery housing (10), a first connecting piece (12) arranged at the bottom of the winding core (11), a second connecting piece (13) arranged at the top of the winding core (11), a top cover (14) fixedly connected to and conductive with the battery housing (10), and a pole (15) arranged at the top of the winding core (11); the first connecting piece (12) connects the first pole of the winding core (11) to the battery housing (10), the pole (15) is insulated from the top cover (14), and the second connecting piece (13) connects the second pole of the winding core (11) to the pole (15).

2. A cylindrical battery as claimed in claim 1, characterized in that: The top cover (14) comprises a cover plate body (141) fixedly connected to and in conduction with the battery housing (10); a pole groove (1411) is provided on the cover plate body (141); and the pole (15) comprises a main body (151) fixedly mounted in the pole groove (1411).

3. A cylindrical battery as claimed in claim 2, characterized in that: The top cover (14) further comprises a sealing ring (142) and an upper plastic (143); the sealing ring (142) is arranged at the bottom of the pole groove (1411); and the upper plastic (143) is arranged between the main body (151) and the pole groove (1411).

4. A cylindrical battery as claimed in claim 2, characterized in that: The cylindrical battery (1) further comprises an insulating pad (16), wherein the insulating pad (16) is arranged between the second connecting piece (13) and the top cover (14), and the pole (15) further comprises a first boss (152) arranged on the second connecting piece (13), wherein the first boss (152) penetrates the insulating pad (16) and is fixedly connected to the main body (151).

5. A cylindrical battery as claimed in claim 4, characterized in that: The second connecting sheet (13) is provided with a first notch (131), the first notch (131) dividing the second connecting sheet (13) into a second pole connecting portion (132) and a pole connecting portion (133), the second pole connecting portion (132) being fixedly connected to the second pole of the winding core (11), and the first boss (152) being arranged at the center of the pole connecting portion (133).

6. A cylindrical battery as claimed in claim 1, characterized in that: The first connecting sheet (12) is provided with a second notch (121), the second notch (121) dividing the first connecting sheet (12) into a first pole connecting portion (122) and a shell connecting portion (123), the first pole connecting portion (122) being fixedly connected to the first pole of the winding core (11), and the shell connecting portion (123) being fixedly connected to the bottom wall of the battery shell (10).

7. A cylindrical battery as claimed in claim 6, characterized in that: A second boss (1231) and a third boss (1232) are provided at the bottom of the shell connecting portion (123); the second boss (1231) is provided at the center position of the bottom of the shell connecting portion (123); the third boss (1232) is provided at an eccentric position of the bottom of the shell connecting portion (123); the second boss (1231) is fixedly connected to the bottom wall of the battery shell (10); and the third boss (1232) is in contact with the bottom wall of the battery shell (10).

8. A cylindrical battery as claimed in claim 1, characterized in that: A liquid injection hole (101) is provided at the bottom of the battery housing (10), and the liquid injection hole (101) connects the interior of the battery housing (10) with the outside.

9. A cylindrical battery as claimed in claim 8, characterized in that: The bottom of the battery housing (10) is provided with a first step (102) and a second step (103), the first step (102) and the second step (103) being arranged in sequence on the outside of the injection hole (101), and the cylindrical battery (1) further comprises an explosion-proof valve (17) fixedly mounted on the first step (102), and a protective film (18) fixedly mounted on the second step (103).

10. A battery module, comprising a cylindrical battery as claimed in any one of claims 1 to 9, characterized in that: It also comprises a busbar (2), a first total pole piece (3) and a second total pole piece (4); a plurality of the cylindrical batteries (1) are arranged in an array; the busbar (2) connects the top covers (14) and the poles (15) of two adjacent cylindrical batteries (1); the first total pole piece (3) is connected to the top cover (14) of the cylindrical battery (1) at the head end; and the second total pole piece (4) is connected to the pole (15) of the cylindrical battery (1) at the tail end.

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