Battery cover plate and battery

Abstract

The utility model discloses a battery cover plate which comprises a base plate, a liquid injection port, an anti-explosion valve and a pressure detection port, and the liquid injection port, the anti-explosion valve and the pressure detection port are arranged on the base plate. The pressure detection port is communicated with the interior of the battery and used for being connected with a pressure sensor to monitor the internal pressure of the battery. The utility model also discloses a battery. The battery cover plate provided by the utility model can detect and monitor the internal pressure of the battery in real time, ensures the safety of the battery in the detection process, and provides a safer detection environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field especially relates to a battery cover plate and battery. BACKGROUND

[0002] With the continuous development of new energy vehicles, consumers have put forward higher demands on the reliability and safety performance of vehicles. And the battery will produce gas in the process of charging and discharging, and the generated gas is easy to cause the expansion of the battery volume and increase the polarization of the battery, which seriously affects the use performance and safety performance of the battery. Therefore, monitoring the internal pressure of the battery in the actual use process has important reference significance for battery research and development work such as battery structure design, battery peripheral welding strength design, etc.

[0003] In the prior art, for example, CN208968737U proposes a lithium ion cell internal pressure test structure, which installs a pressure sensor at the liquid injection port and is sealed by a sealing ring. Long-term use has the risk of corrosion of the sealing ring by electrolyte, thereby causing air and liquid leakage, affecting the detection of the internal pressure of the subsequent battery. For another example, CN206848445U proposes a device for quickly testing the internal pressure of a finished hard-shell lithium ion battery, which is connected through a pressure sensor and an explosion-proof valve, which destroys the battery exhaust port, causing safety hazards in the subsequent detection process of the battery. SUMMARY

[0004] To solve the above technical problems, the embodiments of the utility model provide a battery cover plate and a battery.

[0005] In a first aspect, the embodiments of the utility model disclose a battery cover plate, which comprises a substrate, a liquid injection port, an explosion-proof valve and a pressure detection port, wherein the liquid injection port, the explosion-proof valve and the pressure detection port are arranged on the substrate.

[0006] The pressure detection port is in communication with the interior of the battery and is connected with a pressure sensor to monitor the internal pressure of the battery.

[0007] By adopting the above technical scheme, the pressure detection port can be arranged without being arranged at the explosion-proof valve or the liquid injection port, and the pressure detection port can be added without damaging the original component design of the battery. The pressure detection port is connected with the pressure sensor, the internal environment of the battery is monitored in real time during the test, and the gas generation during the charging and discharging process of the battery is studied, so that the overall research and design of the battery are optimized.

[0008] Optionally, the pressure detection port comprises a connecting port and a connecting part arranged oppositely along a first direction, the first direction is perpendicular to the substrate, the connecting port penetrates the substrate, the connecting part is connected with the connecting port, and the connecting part is connected with the pressure sensor.

[0009] Optionally, the connecting portion comprises a bottom plate and a protruding pipe, the bottom plate is fixedly connected with the base plate, the protruding pipe is fixedly connected with the bottom plate, the protruding pipe and the connecting port are oppositely arranged along the first direction, and an inner wall of the protruding pipe is provided with a screw thread, and the protruding pipe is connected with the pressure sensor.

[0010] Optionally, the bottom plate and the base plate are detachably connected.

[0011] Optionally, a cross-sectional shape of the connecting port along a second direction is one or more of a circle, a rectangle, a polygon, or an irregular shape, and the second direction is an extension direction of the base plate.

[0012] Optionally, the connecting port has oppositely arranged first and second ends along the second direction, and a distance between the first and second ends along the second direction is 5-10 mm.

[0013] Optionally, a terminal is further arranged on the base plate, and the connecting port is located between the explosion-proof valve and the terminal along the second direction.

[0014] Optionally, a distance between the first end and the explosion-proof valve along the second direction is 2-5 mm, and a distance between the second end and the terminal along the second direction is 2-5 mm.

[0015] Optionally, the liquid injection port is a groove structure.

[0016] In a second aspect, the embodiments of the utility model disclose a battery, which comprises the battery cover plate in any one of the embodiments of the first aspect.

[0017] The above technical scheme can ensure the safety of the battery, can monitor and control the internal pressure of the battery in real time, and has important significance for the design and development, improvement and performance test of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 Fig. 1 shows a structural schematic diagram of a battery cover plate according to an embodiment of the utility model;

[0019] Fig. 2 Fig. 2 shows a structural schematic diagram of a connecting portion according to an embodiment of the utility model.

[0020] 1. A battery cover plate, 11. A base plate, 12. A liquid injection port, 13. An explosion-proof valve, 14. A connecting port, 141. A first end, 142. A second end, 15. A connecting portion, 151. A bottom plate, 152. A protruding pipe, 16. A terminal, 161. A positive terminal, and 162. A negative terminal.

[0021] z. A first direction, and x. A second direction DETAILED DESCRIPTION

[0022] The following description will be made to the embodiments of the present application by specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application. Although the description of the present application will be introduced in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications which can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0023] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0024] The terms "first", "second", and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present embodiment, it should also be noted that unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail in combination with the drawings.

[0027] In the prior art, the battery is mainly divided into three shapes of square, cylindrical and soft package. In the embodiments of the present application, the packaging structure of the cylindrical battery and the square battery is relatively similar, and both are composed of a shell and a cover plate.

[0028] In a first aspect, as Figs. 1-2As shown, the embodiment of the utility model discloses a battery cover plate 1, including substrate 11, liquid injection port 12, explosion -proof valve 13 and pressure detection mouth, liquid injection port 12, explosion -proof valve 13 and pressure detection mouth are located substrate 11, pressure detection mouth and battery interior intercommunication are used for with pressure sensor connection to monitor battery interior pressure. That is, substrate 11 is equipped with independent liquid injection port 12, explosion -proof valve 13 and pressure detection mouth, and liquid injection port 12, explosion -proof valve 13 and pressure detection mouth work independently.

[0029] In which, pressure detection mouth is connected with pressure sensor, to realize real -time monitoring battery interior pressure. Explosion -proof valve 13 is used for when battery interior pressure is too high, automatic opening, release pressure, prevent battery explosion. Liquid injection port 12 is the recess structure, and the recess structure increases the complexity of fluid flow path, so that when injecting electrolyte, liquid will not easily overflow, thereby reducing the risk of electrolyte leakage, and the recess structure is more conducive to the sealing of the liquid injection port 12, so that the liquid injection port 12 can be effectively sealed after the completion of the electrolyte injection, ensuring the long-term stability of the battery. In addition, the pressure sensor, for example, is a pressure sensor with a display screen, which is beneficial to researchers to visually observe and record the pressure changes of the battery during the cycle storage and safety test processes.

[0030] By adopting the above technical scheme, compared with the prior art, the utility model does not need to change the explosion -proof valve 13 and liquid injection port 12 to set the pressure detection mouth, and increases the pressure detection mouth on the basis of not damaging the original part design of the battery, connects the pressure detection mouth and the pressure sensor, realizes real -time monitoring of the internal environment of the battery, and further studies the gas generation during the charging and discharging process of the battery, so as to optimize the overall research and design of the battery. At the same time, the above setting ensures the safety of the battery during the detection process, provides a safer detection environment, and has a simple structure, is easy to operate, and has low production cost.

[0031] In some other possible embodiments of the utility model, the pressure detection mouth includes a connecting port 14 and a connecting part 15 arranged opposite along a first direction, the first direction is perpendicular to the substrate 11, and the first direction is, for example Fig. 2 The z direction shown in the middle. Specifically, the connecting port 14 is arranged on the substrate 11, and more specifically, the connecting port 14 penetrates the substrate 11; the connecting part 15 is connected with the connecting port 14, and the connecting part 15 is used to connect with the pressure sensor. That is, the connecting port 14 of the utility model is connected with the pressure sensor through the connecting part 1. In particular, during the pressure detection process, the air tightness seriously affects the accuracy and accuracy of the detection result. Therefore, by penetrating the substrate 11 through the above connecting port 14, cooperating with the connecting part 15, a more reliable sealing structure can be formed, preventing foreign matter from entering the battery interior due to the existence of the pressure detection mouth, while avoiding electrolyte leakage, and also ensuring the accuracy of the pressure sensor detection.

[0032] In addition, a sealing member matched with the connecting port 14 is arranged, which is used to seal the connecting port 14 when the connecting port 14 is not connected with the connecting part 15, so as to ensure the sealing of the battery structure. Specifically, the sealing member is, for example, a sealing nail. In other embodiments, the connecting port 14 and the connecting part 15 are fixedly connected by welding. That is, when the connecting port 14 is not fixedly connected with the connecting part 15 by welding, the sealing nail can be used for sealing, and the sealing nail can be removed before welding, the connecting port 14 and the connecting part 15 are fixedly connected by welding, and after welding, the connecting part 15 is connected with the pressure sensor, so as to ensure the sealing of the whole structure.

[0033] Further, as shown in Fig. 2 The connecting part 15 includes a bottom plate 151 and a protruding pipe 152. The bottom plate 151 is fixedly attached to the base plate 11, and the protruding pipe 152 is fixed to the bottom plate 151. The protruding pipe 152 and the connecting port 14 are oppositely arranged along the first direction, that is, the protruding pipe 152 and the connecting port 14 are butted along the first direction, so that the pressure sensor can be in communication with the connecting port 14 through the protruding pipe 152. The inner wall of the protruding pipe 152 is provided with threads, and the protruding pipe 152 is adaptively connected with the pressure sensor, that is, the pressure sensor is tightly connected with the protruding pipe 152 through the threads, so that the connection between the protruding pipe 152 and the pressure sensor is not easy to fall off, and meanwhile, the quick connection and disconnection are facilitated, which provides convenience for maintenance and replacement in the pressure detection process.

[0034] Further, the bottom plate 151 and the base plate 11 are detachably connected. For example, the bottom plate 151 and the base plate 11 are connected by means of hot melt glue, and after connection, the hot melt glue is heated again to melt, so that the bottom plate 151 and the base plate 11 can be separated. In this way, the protruding pipe 152 is fixed to the bottom plate 151, and the protruding pipe 152 is connected with the pressure sensor, so as to ensure the sealing between the pressure sensor and the battery cover plate 1. At the same time, the replacement of parts is facilitated, the maintenance cost is reduced, the user can also replace the bottom plate 151 of different functions according to different sensor types, and unnecessary damage is avoided. The shape of the bottom plate 151 is not specifically limited in the utility model, and can be selected according to actual needs.

[0035] In some other possible embodiments of the utility model, the connecting port 14 is in the shape of one or more of a circle, a rectangle, a polygon or an irregular shape in the second direction, and the second direction is the extension direction of the base plate 11, for example, the x direction shown in Fig. 1 By providing the connecting port 14 in multiple cross-sectional shapes, the adaptability and flexibility of the connecting port 14 are enhanced to meet the needs of sensors of any type, and the compatibility of the overall design is improved.

[0036] Further, the connecting port 14 has a first end 141 and a second end 142 oppositely arranged along the second direction, that is, the second direction is a direction in which the first end 141 faces the second end 142 or a direction in which the second end 142 faces the first end 141, and a distance between the first end 141 and the second end along the second direction is 5-10 mm. In this way, it is ensured that the connecting port 14 can be exposed through the protruding pipe 152, and the sealing performance of the pressure detection port is ensured. Specifically, for example, when the cross-sectional shape of the connecting port 14 along the second direction is circular, the distance between the first end 141 and the second end 142 along the second direction, that is, the diameter of the circle.

[0037] In some other possible embodiments of the utility model, the battery cover plate 1 further comprises a terminal 16, the terminal 16 is arranged on the substrate 11, specifically, the terminal 16 comprises a positive terminal 161 and a negative terminal 162, and the terminal 16 and the substrate 11 are connected by welding, thereby ensuring the stability of the connection. The connecting port 14 is located between the explosion-proof valve 13 and the terminal 16 along the second direction, which is beneficial to improve the space utilization of the battery cover plate 1 and make the structure more compact. In combination with Fig. 1 As shown, the terminal 16 is arranged at both ends of the substrate 11 along the second direction, specifically, the positive terminal 161 and the negative terminal 162 are arranged at both ends of the substrate 11 along the second direction, the liquid injection port 12 is arranged between the positive terminal 161 and the explosion-proof valve 13 along the second direction, and the pressure detection port is arranged between the explosion-proof valve 13 and the negative terminal 162 along the second direction.

[0038] The inventor also considers that the pressure detection port has an influence on the original structural components of the battery cover plate 1. Based on this, the distance between the first end 141 and the explosion-proof valve 13 along the second direction is 2-5 mm, and the distance between the second end 142 and the terminal 16 along the second direction is 2-5 mm, specifically, the distance between the second end 142 and the negative terminal 162 along the second direction is 2-5 mm. In this way, a reasonable distance between components is maintained, electrical interference between components is reduced, the reliability of the battery is improved, and the safety during detection is ensured. The above distance is also helpful to improve the maintenance convenience of the battery cover plate 1. When it is necessary to replace or repair components such as the terminal 16 or the explosion-proof valve 13, technicians do not need to remove other adjacent components, thereby simplifying the maintenance process, reducing maintenance costs, and also reducing the potential damage risk caused by improper maintenance.

[0039] In a second aspect, the embodiments of the utility model disclose a battery comprising the battery cover plate 1 in any of the embodiments of the first aspect.

[0040] By adopting the above technical scheme, the internal pressure of the battery can be monitored and controlled in real time while ensuring the safety of the battery, which is of great significance to the design and development, improvement and performance test of the battery.

[0041] Although the utility model has been illustrated and described by referring to certain preferred embodiments of the utility model, it should be understood by those skilled in the art that the above content is the further detailed description of the utility model combined with the specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple inferences or replacements, without departing from the spirit and scope of the utility model.

Claims

1. A battery cover plate, characterized by, The battery cover plate comprises a substrate, a liquid injection port, an explosion-proof valve and a pressure detection port, wherein the liquid injection port, the explosion-proof valve and the pressure detection port are arranged on the substrate; The pressure detection port is connected with the inside of the battery and connected with a pressure sensor to monitor the pressure inside the battery.

2. The battery cover plate of claim 1, wherein, The pressure detection port comprises a connecting port and a connecting part arranged oppositely along a first direction, wherein the first direction is perpendicular to the substrate, the connecting port penetrates the substrate, the connecting part is connected with the connecting port, and the connecting part is connected with the pressure sensor.

3. The battery cover plate of claim 2, wherein, The connecting part comprises a bottom plate and a protruding tube, wherein the bottom plate is fixedly connected with the substrate, the protruding tube is fixedly connected with the bottom plate, the protruding tube and the connecting port are arranged oppositely along the first direction, the inner wall of the protruding tube is provided with a screw thread, and the protruding tube is connected with the pressure sensor.

4. The battery cover plate of claim 3, wherein, The bottom plate and the substrate are detachably connected.

5. The battery cover plate of claim 2, wherein, The cross-sectional shape of the connecting port along a second direction is one or more of a circular shape, a rectangular shape, a polygonal shape or an irregular shape, wherein the second direction is the extending direction of the substrate.

6. The battery cover plate of claim 5, wherein, The connecting port has a first end and a second end arranged oppositely along the second direction, and the distance between the first end and the second end along the second direction is 5-10 mm.

7. The battery cover plate of claim 6, wherein, The battery cover plate further comprises a terminal arranged on the substrate, and the connecting port is located between the explosion-proof valve and the terminal along the second direction.

8. The battery cover plate of claim 7, wherein, The distance between the first end and the explosion-proof valve along the second direction is 2-5 mm, and the distance between the second end and the terminal along the second direction is 2-5 mm.

9. The battery cover plate of claim 1, wherein, The liquid injection port is a groove structure.

10. A battery, characterized by The battery cover plate comprises a substrate, a liquid injection port, an explosion-proof valve and a pressure detection port, wherein the liquid injection port, the explosion-proof valve and the pressure detection port are arranged on the substrate; The pressure detection port is connected with the inside of the battery and connected with a pressure sensor to monitor the pressure inside the battery. The pressure detection port comprises a connecting port and a connecting part arranged oppositely along a first direction, wherein the first direction is perpendicular to the substrate, the connecting port penetrates the substrate, the connecting part is connected with the connecting port, and the connecting part is connected with the pressure sensor. The connecting part comprises a bottom plate and a protruding tube, wherein the bottom plate is fixedly connected with the substrate, the protruding tube is fixedly connected with the bottom plate, the protruding tube and the connecting port are arranged oppositely along the first direction, the inner wall of the protruding tube is provided with a screw thread, and the protruding tube is connected with the pressure sensor. The bottom plate and the substrate are detachably connected. The cross-sectional shape of the connecting port along a second direction is one or more of a circular shape, a rectangular shape, a polygonal shape or an irregular shape, wherein the second direction is the extending direction of the substrate. The connecting port has a first end and a second end arranged oppositely along the second direction, and the distance between the first end and the second end along the second direction is 5-10 mm. The battery cover plate further comprises a terminal arranged on the substrate, and the connecting port is located between the explosion-proof valve and the terminal along the second direction. The distance between the first end and the explosion-proof valve along the second direction is 2-5 mm, and the distance between the second end and the terminal along the second direction is 2-5 mm. The liquid injection port is a groove structure. The battery cover plate comprises a substrate, a liquid injection port, an explosion-proof valve and a pressure detection port, wherein the liquid injection port, the explosion-proof valve and the pressure detection port are arranged on the substrate;

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