A high-safety lithium power battery with CID and external PTC

Abstract

The present invention relates to a high-safety lithium-ion power battery equipped with a CID and an external PTC, belonging to the technical field of lithium-ion power batteries. It mainly addresses the problem that existing products lack a protective structure and proposes the following technical solution, including a battery body consisting of a shell, a winding core, a positive electrode component, and a negative electrode component. The positive electrode component includes a positive bus bar arranged inside the shell, and a positive lower top plate, a positive upper support plate, and a positive plastic separator are arranged above the positive bus bar in sequence. The CID component is installed on the positive upper support plate, and a positive electrode column and an explosion-proof valve are installed on the positive upper cover plate. The negative electrode component includes a negative bus bar arranged inside the shell, and a cover is provided below the negative bus bar, and a conductive component is provided at the bottom of the cover. The present invention, through the combined arrangement of the PTC sheet and the CID component, can effectively prevent the occurrence of spontaneous combustion, explosion, and other phenomena in the battery due to abnormalities such as short circuits and overcurrent, thereby improving the safety performance of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium-ion power batteries, and in particular to a high-safety lithium power battery equipped with a CID and an external PTC. Background Art

[0002] In today's world of excessive energy consumption and increasingly severe environmental pollution, the nation is promoting "energy conservation, emission reduction, and low-carbon travel," giving the new energy industry a promising future. After repeated market selection and elimination, widely used high-performance cylindrical lithium-ion power batteries have gained market recognition. They are energy-efficient and environmentally friendly, boasting large capacity, high energy density, and a long service life.

[0003] While lithium-ion battery safety has long been a concern, accidents involving these batteries continue to occur. Leakage, bulging, smoke, spontaneous combustion, and even explosions are all possible. These problems can be caused by internal short circuits, excessive charge and discharge currents, or overcharge and overdischarge. During the charge and discharge process, a short-circuited battery can cause internal temperatures and pressures to rise continuously, potentially posing a risk of explosion.

[0004] Therefore, how to process lithium-ion power batteries is a technical problem that those skilled in the art currently need to solve. Summary of the Invention

[0005] The purpose of the present invention is to address the problems existing in the background technology and to propose a high-safety lithium power battery equipped with a CID and an external PTC.

[0006] The technical solution of the present invention is: a high-safety lithium-powered battery equipped with a CID and an external PTC, comprising a battery body consisting of a housing, a winding core, a positive electrode component, and a negative electrode component. The positive electrode component comprises a positive bus bar disposed inside the housing, and a positive electrode lower top plate, a positive electrode upper support plate, and a positive electrode plastic separator are sequentially disposed above the positive bus bar. The CID component is mounted on the positive electrode upper support plate, and the positive electrode column and explosion-proof valve are mounted on the positive electrode upper cover plate.

[0007] The negative electrode component includes a negative electrode bus bar disposed inside the housing, a cover member is provided below the negative electrode bus bar, a conductive component is provided at the bottom of the cover member, and the conductive component is fixed to the negative electrode bus bar by a plurality of rivets to achieve circuit connection;

[0008] The conductive component includes a negative electrode plastic support plate, and the interior of the negative electrode plastic support plate is sequentially provided with a lower conductive sheet, a PTC sheet, an upper conductive sheet, a negative electrode upper plastic plate and a negative electrode upper cover plate from top to bottom, wherein a negative electrode column for conduction is provided at the center of the negative electrode upper cover plate.

[0009] Preferably, the positive electrode component and the negative electrode component are respectively arranged at two ends of the shell, the winding core is arranged inside the shell, and the two ends of the winding core are respectively connected to the positive bus bar and the negative bus bar.

[0010] Preferably, a hole is opened at the center of the positive electrode upper cover plate, the positive electrode column is arranged in the hole, and a positive electrode sealing ring for insulation is provided in the positive electrode column. The bottom end of the positive electrode column passes through the positive electrode plastic separator and is connected to the positive electrode upper support plate.

[0011] Preferably, a slot and a through hole are provided on the side of the hole, the slot is located directly above the CID component, the explosion-proof valve is provided in the through hole, and a through hole is provided below the through hole, which passes through the positive electrode plastic separator, the positive electrode upper support plate and the positive electrode lower top plate.

[0012] Preferably, the cover member includes a negative electrode lower plastic plate arranged on the bottom end of the shell, and a negative electrode lower cover plate is arranged at the bottom of the negative electrode lower plastic plate, wherein the negative electrode lower plastic plate is connected to the negative electrode bus bar.

[0013] Preferably, the negative electrode plastic support plate is arranged on the top outer wall of the negative electrode lower cover plate, a connection hole is opened at the center of the negative electrode upper cover plate, the negative electrode column is arranged in the connection hole, and the top end of the negative electrode column passes through the negative electrode upper plastic plate and contacts the upper conductive sheet.

[0014] Preferably, a negative electrode sealing ring for insulation is provided in the connection hole.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] The combination of PTC chips and CID components can effectively prevent the battery from spontaneous combustion, explosion, and other phenomena caused by abnormalities such as short circuits and overcurrent, thereby improving the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of the present invention is provided;

[0018] Figure 2 for Figure 1 Schematic diagram of the front cross-sectional structure.

[0019] Figure numerals: 1. battery body; 11. shell; 12. winding core; 13. positive electrode component; 131. positive electrode bus bar; 132. positive electrode lower top plate; 133. positive electrode upper support plate; 134. CID component; 135. positive electrode plastic separator; 136. positive electrode upper cover plate; 137. positive electrode column; 138. explosion-proof valve; 14. negative electrode component; 141. negative electrode bus bar; 142. negative electrode lower plastic plate; 143. negative electrode lower cover plate; 144. negative electrode plastic support plate; 145. lower conductive sheet; 146. PTC sheet; 147. upper conductive sheet; 148. negative electrode upper plastic plate; 149. negative electrode upper cover plate; 1410. rivet; 1411. negative electrode column. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] like Figure 1-2 As shown in the figure, the present invention proposes a high-safety lithium-powered battery equipped with a CID and an external PTC, comprising a battery body 1 consisting of a housing 11, a winding core 12, a positive electrode component 13, and a negative electrode component 14. The positive electrode component 13 includes a positive bus bar 131 disposed inside the housing 11. Above the positive bus bar 131 are sequentially arranged a positive electrode lower top plate 132, a positive electrode upper support plate 133, and a positive electrode plastic separator 135. Among them, a CID component 134 is mounted on the positive electrode upper support plate 133, and a positive electrode column 137 and an explosion-proof valve 138 are mounted on the positive electrode upper cover plate 136.

[0023] The negative electrode component 14 includes a negative bus bar 141 disposed within the housing 11. A cover is provided below the negative bus bar 141. A conductive component is provided at the bottom of the cover. The conductive component is fixed to the negative bus bar 141 via multiple rivets 1410 to achieve circuit connectivity.

[0024] The conductive assembly includes a negative plastic support plate 144. Inside the negative plastic support plate 144, from top to bottom, are arranged a lower conductive sheet 145, a PTC sheet 146, an upper conductive sheet 147, a negative upper plastic plate 148, and a negative upper cover plate 149. A negative electrode post 1411 for electrical conduction is located at the center of the negative upper cover plate 149.

[0025] In this embodiment, PTC chip 146 increases its resistance under high current, reducing the current in the circuit. Furthermore, the sheet-shaped PTC chip 146 provides excellent connectivity with other battery components. CID 134 interrupts the current when exposed to high voltage, preventing the reaction within battery body 1 from continuing. With the dual protection of PTC chip 146 and CID 134, battery body 1 boasts high safety performance and significantly reduces risk.

[0026] In this embodiment, the PTC sheet 146 is a positive temperature coefficient thermistor with rapid heating and heat dissipation. Its interior is made of a polymer material, with nickel-plated copper foil welded on both sides and tightly pressed into a sheet with a thickness of 0.1-3 mm. This PTC material has a withstand voltage of 4-5 V and a maximum current of 200 A.

[0027] In this embodiment, the CID 134 is a one-time-use current interruption device, similar to a bowl-shaped structure. To trigger the CID 134, a certain amount of battery pressure must be applied.

[0028] A high-safety lithium-ion power battery configured with a CID and an external PTC based on Example 1 operates as follows: When the current in the battery body 1 is between 0-80A, the resistance of the PTC sheet 146 is low, not exceeding 0.5mΩ, and the temperature change Δt of the PTC sheet 146 is ≤20°C, allowing the battery body 1 to function normally. When an abnormality occurs in the battery body 1, triggering an action with an operating current range of 100A-160A, the PTC sheet 146 will rapidly heat up, generally not exceeding 120°C, and its resistance will increase dramatically. Simultaneously, the current in the circuit will rapidly drop to less than one-tenth of its previous value, preventing the high current from damaging the battery body 1. Once the abnormality is resolved and a current no longer exceeding 0-80A flows through the battery body 1, the PTC sheet 146 will return to a resistance below 0.5mΩ, allowing the battery to continue functioning normally. In addition, the PTC sheet 146 is designed on the outside of the cover, which not only saves the internal space of the battery body 1 and improves the energy density, but also prevents the high-temperature PTC sheet 146 from damaging other internal components of the battery body 1 and affecting the electrolyte when the battery body 1 is abnormal.

[0029] During normal use of the battery body 1, the CID component 134 acts as a conductor to connect the circuit, completing the battery circuit. If an abnormal reaction continues within the battery body 1, the CID component 134 can cut off the current, preventing further danger. This internal reaction generates a large amount of gas, increasing the internal pressure of the battery body 1 and posing a risk of explosion. When the internal pressure reaches 5-15 kg, the CID component 134 flips upward, disconnecting it from the positive bus bar 131. The CID component 134 flips open in the middle, shutting off the current within the battery body 1 while releasing internal pressure. This prevents spontaneous combustion or explosion, ensuring safety.

[0030] Example 2

[0031] like Figure 2As shown, based on the first embodiment, this embodiment further includes: a positive electrode component 13 and a negative electrode component 14 are respectively disposed at opposite ends of the housing 11. A winding core 12 is disposed within the housing 11, with its ends connected to the positive busbar 131 and the negative busbar 141, respectively. A hole is provided at the center of the positive electrode top cover 136, and a positive electrode post 137 is disposed within the hole. A positive electrode sealing ring is provided within the positive electrode post 137 for insulation. The bottom end of the positive electrode post 137 passes through the positive electrode plastic separator 135 and is connected to the positive electrode top support plate 133. A slot and a through-hole are provided on the sides of the hole, located in the positive electrode top cover 136. The slot is located directly above the CID 134. An explosion-proof valve 138 is disposed within the through-hole, and below the through-hole is a through-hole that penetrates the positive electrode plastic separator 135, the positive electrode top support plate 133, and the positive electrode bottom top plate 132.

[0032] In this embodiment, the bursting pressure of the flip piece of the CID component 134 is lower than that of the explosion-proof valve 138 , and the protection action occurs before the explosion-proof valve 138 , thereby forming a double protection for the battery together with the explosion-proof valve 138 .

[0033] In this embodiment, the positive electrode upper cover plate 136 and the positive electrode upper support plate 133 are insulated by a positive electrode plastic separator 135. At the same time, the positive electrode plastic separator 135 extends downward to prevent the positive electrode upper support plate 133 and the positive electrode lower top plate 132 from contacting the inner wall of the housing 11.

[0034] Example 3

[0035] like Figure 2 As shown, based on the above-mentioned embodiment one or two, this embodiment also includes: the sealing member includes a negative lower plastic plate 142 arranged on the bottom end of the shell 11, and a negative lower cover plate 143 is provided at the bottom of the negative lower plastic plate 142. Among them, the negative lower plastic plate 142 is connected to the negative bus bar 141. The negative plastic support plate 144 is arranged on the top outer wall of the negative lower cover plate 143, and a connecting hole is opened at the center of the negative upper cover plate 149. The negative column 1411 is arranged in the connecting hole, and the top of the negative column 1411 passes through the negative upper plastic plate 148 and contacts the upper conductive sheet 147. A negative sealing ring for insulation is provided in the connecting hole.

[0036] In this embodiment, the number of rivets 1410 is set in a range of two to six, and two rivets are used in this embodiment, and the rivets 1410 have a stepped structure. The upper portion of the rivet 1410 is non-conductive, and the lower portion of the rivet 1410 is conductive.

[0037] In this embodiment, the negative electrode upper cover plate 149 , the upper conductive sheet 147 and the PTC sheet 146 are all provided with an insulating ring 1 for insulating the rivet 1410 , and the negative electrode lower cover plate 143 is provided with an insulating ring 2 for insulating the rivet 1410 .

[0038] The above specific embodiments are only several preferred embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A high-safety lithium power battery equipped with a CID and an external PTC, comprising a battery body (1) consisting of a housing (11), a winding core (12), a positive electrode component (13) and a negative electrode component (14), characterized in that: The positive electrode component (13) includes a positive electrode bus bar (131) arranged inside the housing (11), and a positive electrode lower top plate (132), a positive electrode upper support plate (133) and a positive electrode plastic separator (135) are sequentially arranged above the positive electrode bus bar (131), wherein a CID component (134) is installed on the positive electrode upper support plate (133), and a positive electrode column (137) and an explosion-proof valve (138) are installed on the positive electrode upper cover plate (136); The negative electrode component (14) includes a negative electrode bus bar (141) disposed inside the housing (11); a cover is provided below the negative electrode bus bar (141); a conductive component is provided at the bottom of the cover; the conductive component and the negative electrode bus bar (141) are fixed via a plurality of rivets (1410) to achieve circuit connectivity; The conductive component includes a negative electrode plastic support plate (144), wherein the interior of the negative electrode plastic support plate (144) is provided with a lower conductive sheet (145), a PTC sheet (146), an upper conductive sheet (147), a negative electrode upper plastic plate (148) and a negative electrode upper cover plate (149) in order from top to bottom, wherein a negative electrode column (1411) for conducting electricity is provided at the center of the negative electrode upper cover plate (149); The positive electrode component (13) and the negative electrode component (14) are respectively arranged at two ends of the shell (11); the winding core (12) is arranged inside the shell (11); and the two ends of the winding core (12) are respectively connected to the positive electrode bus bar (131) and the negative electrode bus bar (141); A hole is provided at the center of the positive electrode upper cover plate (136), the positive electrode column (137) is arranged in the hole, and a positive electrode sealing ring for insulation is provided in the positive electrode column (137), the bottom end of the positive electrode column (137) passes through the positive electrode plastic separator (135) and is connected to the positive electrode upper support plate (133); A slot and a through hole are provided on the side of the hole, which are located on the positive electrode upper cover plate (136). The slot is located directly above the CID component (134). The explosion-proof valve (138) is provided in the through hole, and a through hole is provided below the through hole, which penetrates the positive electrode plastic separator (135), the positive electrode upper support plate (133) and the positive electrode lower top plate (132).

2. A high-safety lithium power battery configured with a CID and an external PTC according to claim 1, characterized in that: The sealing member comprises a negative electrode lower plastic plate (142) arranged on the bottom end of the shell (11), and a negative electrode lower cover plate (143) is arranged at the bottom of the negative electrode lower plastic plate (142), wherein the negative electrode lower plastic plate (142) is connected to the negative electrode bus bar (141).

3. A high-safety lithium power battery configured with a CID and an external PTC according to claim 2, characterized in that: The negative electrode plastic support plate (144) is arranged on the top outer wall of the negative electrode lower cover plate (143), and a connection hole is opened at the center of the negative electrode upper cover plate (149). The negative electrode column (1411) is arranged in the connection hole, and the top end of the negative electrode column (1411) passes through the negative electrode upper plastic plate (148) and contacts the upper conductive sheet (147).

4. A high-safety lithium power battery configured with a CID and an external PTC according to claim 3, characterized in that: A negative electrode sealing ring for insulation is provided in the connecting hole.

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