Lithium battery cover plate and lithium battery

Abstract

The utility model discloses a lithium battery cover plate and a lithium battery. The lithium battery cover plate is connected with a transmission circuit board and a connecting line, and comprises a main body, a battery positive pole and a battery negative pole which are arranged at two ends of the main body, and a safety valve arranged between the battery positive pole and the battery negative pole, the lithium battery cover plate further comprises a connector which is arranged on the top surface of the main body; the connector sequentially comprises a base, an isolation ring, a sealing ring and a sealing gasket from top to bottom. The transmission circuit board is arranged between the sealing gasket and the sealing ring; the connecting wire is arranged on the outer side of the sealing ring; the isolation ring, the sealing ring, the transmission circuit board and the sealing gasket are pressed and fixed on the main body through the base, and the sealing ring is tightly attached to the transmission circuit board through deformation. The lithium battery comprises a shell and the lithium battery cover plate. Through the arrangement, the lithium battery cover plate has a better sealing effect on the connecting wire, and the sealing process is simpler. The lithium battery using the lithium battery cover plate is more convenient to assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lithium battery cover plate and a lithium battery. Background Art

[0002] In recent years, with the proposal of the global strategic goal of "dual carbon", the country has vigorously developed new energy vehicles and large-scale energy storage technology with electricity as the core. Among them, the widely used lithium batteries are chemically unstable and prone to thermal runaway due to improper use. A supporting battery management system (BMS) is needed to monitor and protect the working status of the battery.

[0003] At present, using external battery sensors to manage and analyze battery health is a relatively mature method. However, since the sensors are placed outside the battery, the battery volume is increased, and the safety problems caused by the battery are generally caused by side reactions inside the battery, which cause sudden changes in the temperature or pressure inside the battery. Therefore, in order to better monitor and manage battery safety and performance, implanting sensors inside the battery is one of the most effective means to monitor battery health.

[0004] In the prior art, there is no simple and effective way to seal the internal signal collection lead of the battery. For example, in patent CN217641491U, the internal signal collection lead of the battery is sealed by injection molding, but the sealing process is complicated and time-consuming. Utility Model Content

[0005] In order to solve the deficiencies of the prior art, the purpose of the utility model is to provide a lithium battery cover plate that can simply and effectively seal internal signal collection leads and a lithium battery using the lithium battery cover plate.

[0006] Based on the above purpose, the utility model adopts the following technical solution.

[0007] A lithium battery cover is connected with a transmission circuit board and a connecting line, comprising: a main body, a battery positive column through hole and a battery negative column through hole arranged at both ends of the main body, and a safety valve arranged between the battery positive column through hole and the battery negative column through hole; the lithium battery cover also includes a connector, and the connector is arranged on the top surface of the main body; the connector includes a base, an isolation ring, a sealing ring and a sealing gasket from top to bottom; the transmission circuit board is arranged between the sealing gasket and the sealing ring, and the connecting line is arranged on the outside of the sealing ring; the base presses the isolation ring, the sealing ring, the transmission circuit board and the sealing gasket to fix them on the main body, and the sealing ring fits tightly with the transmission circuit board through deformation.

[0008] Furthermore, the bottom of the isolation ring is arranged in the sealing ring; a connecting hole is arranged on the base, and the base is sleeved on the isolation ring through the connecting hole; a plurality of contacts are arranged on the transmission circuit board, and the contacts are arranged in the isolation ring.

[0009] Furthermore, the main body and the sealing gasket are both provided with through holes through which the connecting wires and the transmission circuit board can pass.

[0010] Furthermore, the sealing ring is made of fluororubber or silicone rubber.

[0011] Furthermore, the sealing gasket is made of fluororubber or silicone rubber.

[0012] Furthermore, the isolation ring is made of polyvinyl chloride.

[0013] Furthermore, the base is made of aluminum alloy, and the connection between the base and the main body is set to be welding.

[0014] A lithium battery comprises a shell, a collection circuit board arranged in the shell, and the lithium battery cover plate, wherein the main body is connected to the shell.

[0015] Furthermore, the acquisition circuit board, the transmission circuit board and the connecting wires are integrally formed and are all configured as flexible circuit boards.

[0016] The lithium battery cover plate is pressed to deform the sealing ring so that it fits tightly on the transmission circuit board to seal the connecting wire outside the sealing ring, thereby ensuring the sealing reliability and simplifying the sealing process of the connecting wire. In addition, the lithium battery reduces the difficulty of assembly by using the lithium battery cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a lithium battery provided according to the utility model;

[0018] Figure 2 It is an exploded view of the first assembly method of the connector provided by the utility model;

[0019] Figure 3 is an exploded view of a second assembly method of the connector provided by the utility model;

[0020] Figure 4 It is a cross-sectional view of a connector in a second assembly mode provided by the utility model. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the utility model in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0022] like Figure 1 and Figure 2As shown, the present application provides a lithium battery cover plate 11, which is used to cover the shell 12 of the lithium battery, and the lithium battery cover plate 11 is connected to a transmission circuit board 13 and a connecting line 14. Specifically, the lithium battery cover plate 11 includes a main body 111, and along the length direction of the lithium battery cover plate 11, a battery positive column through hole 112 and a battery negative column through hole 113 are provided at both ends of the main body 111; a safety valve 114 is provided between the battery positive column through hole 112 and the battery negative column through hole 113. When the pressure in the shell 12 is greater than the preset pressure threshold, the safety valve 114 will be opened to release the pressure in the shell 12 to protect the safety of the lithium battery. Furthermore, the lithium battery cover plate 11 also includes a collection circuit board 15. The collection circuit board 15 is at least partially disposed in the shell 12, and the collection circuit board 15 is used to collect pressure, temperature and other signals in the shell 12. The transmission circuit board 13 is at least partially disposed outside the housing 12. The transmission circuit board 13 is connected to the acquisition circuit board 15 via a connecting line 14. The transmission circuit board 13 is used to transmit pressure, temperature and other signals in the housing 12 to an external battery management system to perform safety detection and management on the inside of the lithium battery. Figure 1 The front side, rear side, left side, right side, top side and bottom side are shown. It can be understood that the length direction of the lithium battery cover plate 11 in the embodiment of the present application refers to the left-right direction of the lithium battery cover plate 11; the width direction of the lithium battery cover plate 11 refers to the front-back direction of the lithium battery cover plate 11; the height direction of the lithium battery cover plate 11 refers to the up-down direction of the lithium battery cover plate 11.

[0023] As an optional implementation, Figure 1 and Figure 2 As shown, the lithium battery cover plate 11 also includes a connector 115, which is at least partially arranged on the top surface of the main body 111. Specifically, the connector 115 includes a base 1151, an isolation ring 1152, a sealing ring 1153 and a sealing gasket 1154 from top to bottom. The transmission circuit board 13 is arranged between the sealing gasket 1154 and the sealing ring 1153, and the connecting line 14 is arranged on the outside of the sealing ring 1153. The base 1151 presses and fixes the isolation ring 1152, the sealing ring 1153, the transmission circuit board 13 and the sealing gasket 1154 on the main body 111, and the sealing ring 1153 is tightly fitted with the transmission circuit board 13 through deformation to isolate the connecting line 14 from the transmission circuit board 13 in the sealing ring 1153, and seal the transmission circuit board 13 and the connecting line 14. Through the above arrangement, the reliability of the lithium battery sealing the connecting line 14 is higher, and the sealing process is simpler.

[0024] As an optional embodiment, the bottom of the isolation ring 1152 is set in the sealing ring 1153; the base 1151 is provided with a connection hole 1151a, and the base 1151 is sleeved on the isolation ring 1152 through the connection hole 1151a; the transmission circuit board 13 is provided with a plurality of contacts 131, and the contacts 131 are set in the isolation ring 1152. Among them, the number of contacts 131 is consistent with the number of sensors on the acquisition circuit board 15. In the above manner, the contacts 131 can be connected to the external battery management system through the connection hole 1151a to transmit the temperature, pressure and other signals in the housing 12 to the battery management system.

[0025] As an optional embodiment, the main body 111 and the sealing gasket 1154 are both provided with through holes 1155 through which the connecting wire 14 and the transmission circuit board 13 can pass. The transmission circuit board 13 and the connecting wire 14 can pass through the through holes 1155 and be arranged between the sealing gasket 1154 and the sealing ring 1153. The length and width of the through hole 1155 are slightly larger than the length and thickness of the transmission circuit board 13, and the difference is less than or equal to 1 mm, so that the transmission circuit board 13 can pass through, and the thickness of the transmission circuit board 13 and the connecting wire 14 are consistent.

[0026] As an optional embodiment, the sealing ring 1153 is made of fluororubber, silicone rubber or other corrosion-resistant and high-temperature resistant elastic materials to improve the ductility and safety of the sealing ring 1153. Similarly, the sealing gasket 1154 is made of fluororubber, silicone rubber or other corrosion-resistant and high-temperature resistant elastic materials. Through the above configuration, the lithium battery has a better sealing effect on the connecting wire 14 and a higher reliability.

[0027] As an optional implementation, the isolation ring 1152 is made of polyvinyl chloride to improve the insulation, temperature resistance and corrosion resistance of the isolation ring 1152; at the same time, it prevents the electrolyte in the shell 12 from leaking and causing a short circuit.

[0028] Specifically, the extension distance of the transmission circuit board 13 along the length direction of the lithium battery cover plate 11 is the first length D1, and the extension distance of the sealing ring 1153 along the length direction of the lithium battery cover plate 11 is the second length D2. The first length D1 is greater than the second length D2, and the difference between the two is greater than or equal to 2mm and less than or equal to 5mm, so as to prevent the sealing ring 1153 from being separated from the transmission circuit board 13 after pressing, thereby improving the reliability of the sealing of the connector 115. More specifically, the thickness of the sealing ring 1153 is set to 3mm to ensure that the sealing ring 1153 can be tightly fitted with the transmission circuit board 13 after pressing. It can be understood that the thickness of the sealing ring 1153 can be adjusted according to actual conditions. Further, the extension distance of the connection hole 1151a along the length direction of the lithium battery cover plate 11 is the third length D3, and the second length D2 is greater than the third length D3 after removing the thickness of the sealing ring 1153, and the difference between the two is greater than or equal to 2mm and less than or equal to 5mm, thereby reserving assembly space for the isolation ring 1152. Furthermore, the extension distance of the isolation ring 1152 along the length direction of the lithium battery cover 11 is a fourth length D4, and the fourth length D4 is between the second length D2 and the third length D3, so that the isolation ring 1152 can be embedded between the connection hole 1151a and the sealing ring 1153, providing a channel for the contact 131 to connect with the outside world. The thickness of the isolation ring 1152 needs to ensure that the contact 131 is fully exposed, and is fixed on the main body 111 after pressing, and the height does not exceed the thickness of the base 1151.

[0029] Similarly, the dimension settings of the sealing ring 1153, the transmission circuit board 13, the isolation ring 1152 and the connection hole 1151a along the width direction of the lithium battery cover plate 11 are basically consistent with the dimension settings along the length direction of the lithium battery cover plate 11, and are not repeated here.

[0030] As an optional embodiment, the base 1151 can be made of aluminum alloy to ensure that the base 1151 is strong enough to press-fit other components of the connector 115. Specifically, the connection between the base 1151 and the body 111 can be set to be welded all around; more specifically, the base 1151 can be laser welded to the body 111 all around to improve the sealing of the connector 115.

[0031] As another optional implementation, Figure 3 and Figure 4As shown, the base 1151 is arranged at the bottom of the main body 111, and the base 1151 is at least partially arranged in the shell 12. The connector 115 includes a base 1151, a sealing gasket 1154, a transmission circuit board 13, a sealing ring 1153 and an isolation ring 1152 from bottom to top. Through holes 1155 are respectively arranged on the base 1151 and the sealing gasket 1154, and the transmission circuit board 13 can pass through the through hole 1155 and be arranged between the sealing ring 1153 and the sealing gasket 1154, and the connecting line 14 is arranged outside the sealing ring 1153. A transmission hole 16 is arranged on the main body 111, and one end of the isolation ring 1152 is arranged in the sealing ring 1153, and the other end is arranged in the transmission hole 16. A contact 131 is arranged on the transmission circuit board 13, and the contact is arranged in the isolation ring 1152, so that the contact 131 can be connected to the external battery management system through a wire from the transmission hole 16 to transmit the pressure and temperature information in the shell 12 to the battery management system. The base 1151 presses and fixes the sealing gasket 1154, the transmission circuit board 13, the sealing ring 1153 and the isolation ring 1152 on the main body 111, and the base 1151 and the main body 111 are laser welded. Through the above arrangement, the connector 115 has less contact with the outside of the shell 12, so that the connector 115 is less worn, and the stability of the lithium battery structure is improved.

[0032] As an optional embodiment, the present application also provides a lithium battery, which includes a shell 12, a collection circuit board 15 and the above-mentioned lithium battery cover 11. Among them, the main body 111 is connected to the shell 12 to close the opening of the shell 12. Specifically, the collection circuit board 15, the connecting line 14 and the transmission circuit board 13 are integrally formed and are all configured as flexible circuit boards to improve the adaptability and electrical performance of the collection circuit board 15, the connecting line 14 and the transmission circuit board 13.

[0033] In summary, the present application provides a lithium battery cover plate 11, which isolates the connecting wire 14 from the transmission circuit board 13 through a sealing ring 1153, and deforms the sealing ring 1153 and fits tightly with the transmission circuit board 13 by pressing, so as to achieve the sealing of the connecting wire 14 and the transmission circuit board 13. This sealing method simplifies the sealing process of the lithium battery to the connecting wire 14 and the transmission circuit board 13 while ensuring the sealing of the lithium battery. The present application also provides a lithium battery using the above-mentioned lithium battery cover plate 11, and the lithium battery reduces the difficulty of assembly by applying the lithium battery cover plate 11.

[0034] The above is a description of the embodiments of the utility model. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the utility model. Various modifications to these embodiments will be obvious to professionals and technicians in the field. The general principles defined in this article can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed in this article.

Claims

1. A lithium battery cover plate, connected with a transmission circuit board (13) and a connecting line (14), comprising: A main body (111), a battery positive electrode column through hole (112) and a battery negative electrode column through hole (113) arranged at both ends of the main body (111), and a safety valve (114) arranged between the battery positive electrode column through hole (112) and the battery negative electrode column through hole (113); characterized in that the lithium battery cover plate also includes a connector (115), and the connector (115) is arranged on the top surface of the main body (111); the connector (115) includes, from top to bottom, a base (1151), an isolation ring (1152), a sealing ring (1153), and a sealing ring (1154). 53) and a sealing gasket (1154); the transmission circuit board (13) is arranged between the sealing gasket (1154) and the sealing ring (1153), and the connecting line (14) is arranged outside the sealing ring (1153); the base (1151) presses and fixes the isolation ring (1152), the sealing ring (1153), the transmission circuit board (13) and the sealing gasket (1154) on the main body (111), and the sealing ring (1153) is tightly fitted with the transmission circuit board (13) through deformation.

2. The lithium battery cover plate according to claim 1, characterized in that: The bottom of the isolation ring (1152) is arranged in the sealing ring (1153); a connection hole (1151a) is provided on the base (1151), and the base (1151) is sleeved on the isolation ring (1152) through the connection hole (1151a); a plurality of contacts (131) are provided on the transmission circuit board (13), and the contacts (131) are arranged in the isolation ring (1152).

3. The lithium battery cover plate according to claim 1, characterized in that: The main body (111) and the sealing pad (1154) are both provided with through holes (1155) through which the connecting wire (14) and the transmission circuit board (13) can pass.

4. The lithium battery cover plate according to claim 1, characterized in that: The sealing ring (1153) is made of fluororubber or silicone rubber.

5. The lithium battery cover plate according to claim 1, characterized in that: The sealing gasket (1154) is made of fluororubber or silicone rubber.

6. The lithium battery cover plate according to claim 1, characterized in that: The isolation ring (1152) is made of polyvinyl chloride.

7. The lithium battery cover plate according to claim 1, characterized in that: The base (1151) is made of aluminum alloy, and the connection between the base (1151) and the main body (111) is arranged to be welding.

8. A lithium battery, comprising a housing (12), and a collection circuit board (15) disposed in the housing (12), characterized in that: The lithium battery further comprises a lithium battery cover plate as claimed in any one of claims 1 to 7, and the main body (111) is connected to the shell (12).

9. The lithium battery according to claim 8, characterized in that The acquisition circuit board (15), the transmission circuit board (13) and the connecting wire (14) are integrally formed and are all configured as flexible circuit boards.

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