Top cover structure of power battery

Abstract

The utility model discloses a top cover structure of a power battery, which comprises a cover plate provided with a first mounting hole; the first terminal post assembly comprises a first conductive terminal post, a first insulating part and a first fixing part, the first conductive terminal post comprises a copper terminal post and an aluminum terminal post which are mutually welded and connected, and the first insulating part and the copper terminal post are respectively positioned on the front surface and the back surface which are oppositely arranged on the cover plate; the aluminum pole at least partially penetrates through the first mounting hole and the fifth through hole of the first insulating part, and the copper pole and the back surface of the cover plate are sealed through a first sealing part, so that the first sealing part is clamped between the copper pole and the cover plate; the first fixing piece is arranged on the first insulating piece; the copper pole is provided with a first connecting piece, and the first connecting piece penetrates through the cover plate and the first insulating piece and is fixedly connected with the first fixing piece; the first pole assembly is stable in connection structure and adapts to the scenes of bumpy driving of a new energy automobile, frequent carrying of mobile energy storage equipment and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy lithium battery accessory technical field, especially, it is involved in a power battery top cover structure. BACKGROUND

[0002] The power battery first pole post assembly is the key node of current output, and cooperates with the second pole post assembly to realize energy transmission, and the performance directly determines the safety, energy efficiency and service life of the power battery. Copper material has excellent conductivity, aluminum material has the advantages of light weight and cost, and the combination of the two is the mainstream design direction of the first pole post assembly. However, in the working scene of new energy vehicles, such as bumping, vibration, high temperature and high pressure, or in the long-term continuous operation condition of energy storage equipment, the stability of copper-aluminum connection, the reliability of insulation sealing and the structure fatigue resistance are facing severe tests, and the assembly convenience and consistency also need to be considered in the batch production scene.

[0003] The existing first pole post assembly mounting structure of the power battery has obvious defects in design and material adaptation, and it is difficult to balance the reliability of heterogeneous connection and overall performance. The specific problems are as follows: first, the copper-aluminum connection of the existing first pole post assembly mostly adopts direct mechanical pressure connection or simple welding: mechanical pressure connection is easy to cause the increase of contact gap due to vibration, the increase of connection resistance, the increase of heat, and even the loosening and power failure; simple welding (such as brazing, resistance welding) is easy to produce welding pores and cracks, and the difference in thermal expansion coefficient of copper-aluminum heterogeneous materials will also cause stress concentration after welding, and the welding cracks will occur after long-term use, which not only affects the stability of conduction, but also may cause electrolyte leakage and corrosion of surrounding parts.

[0004] Secondly, the existing first pole post assembly is mostly single columnar or simply spliced structure, and the copper-aluminum connection surface lacks effective support: on the one hand, the structural strength is insufficient, and bending deformation is easy to occur during assembly process or long-term vibration, which causes the increase of the fitting gap between the pole post and the insulating part and the fixing part, and destroys the sealing effect; on the other hand, the contact area of the connection surface is small, the current transmission path is concentrated, the local current density is too large, and the heat is serious, especially in the scene of large rate charging and discharging, which is easy to accelerate the aging of the material and affect the energy output efficiency of the power battery. CONTENT OF THE UTILITY MODEL

[0005] The content part of the present application is used to introduce the concept in a simple form, which will be described in detail in the specific embodiment part. The content part of the present application is not intended to indicate the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0006] The utility model provides a power battery top cover structure in order to overcome the problem of unreliable connection of the first pole post assembly in the prior art.

[0007] In order to achieve the above object, the utility model discloses the following technical scheme: a power battery top cover structure, comprising

[0008] Cover, be provided with first mounting hole on the cover plate;

[0009] The first pole post assembly includes a first conductive pole post, a first insulating part and a first fixing part, the first conductive pole post includes a copper pole post and an aluminum pole post which are connected by welding, the first insulating part and the copper pole post are located at the opposite front and back positions of the cover plate respectively, the aluminum pole post at least partially penetrates the fifth through hole of the first insulating part and the first mounting hole, and the copper pole post and the back of the cover plate are sealed by the first sealing part, so that the first sealing part is clamped between the copper pole post and the cover plate;The first fixing part is arranged on the first insulating part;The copper pole post is provided with a first connecting piece, and the first connecting piece is arranged in the cover plate and the first insulating part and is fixedly connected with the first fixing part.

[0010] Further, the first connecting piece is provided with a plurality of first connecting pieces, and the plurality of first connecting pieces are uniformly arranged around the aluminum pole post.

[0011] Further, the aluminum pole post is provided with a welding connecting part, and the copper pole post is provided with a welding connecting groove, and the welding connecting part is embedded in the welding connecting groove.

[0012] Further, the cross section of the welding connecting part is larger than the cross section of the aluminum pole post.

[0013] Further, the welding connecting part is a plate-shaped rectangular structure, and the end point of the welding connecting part is provided with a circular arc surface.

[0014] Further, the copper pole post and the aluminum pole post are connected together by friction welding, laser welding or ultrasonic welding.

[0015] Further, the power battery top cover structure further includes a second insulating part, the second insulating part is arranged on the same side of the cover plate as the copper pole post, the second insulating part is provided with a fourth through hole for the aluminum pole post to pass through, and the fourth through hole is aligned with the first mounting hole.

[0016] Further, the first insulating part is provided with a first through hole, the first fixing part is provided with a second through hole, the first through hole and the second through hole are aligned, the first connecting piece is arranged in the first through hole and the second through hole and is fixedly connected to the inner wall of the second through hole.

[0017] Further, the first connecting piece is a rod body structure, and the cross section of the first connecting piece is a rectangular structure.

[0018] Further, the power battery top cover structure further includes a second pole post assembly;

[0019] The cover plate is provided with a second mounting hole;

[0020] The second pole post assembly comprises a second conductive pole post, a third insulating piece and a second fixing piece, the second conductive pole post comprises a plate-shaped connecting part and a pole post protrusion, the third insulating piece and the plate-shaped connecting part are respectively located at the front surface and the back surface of the cover plate, the pole post protrusion at least partially penetrates through the second mounting hole and the through hole of the third insulating piece, and the plate-shaped connecting part and the back surface of the cover plate are sealed by the second sealing piece, so that the second sealing piece is clamped between the plate-shaped connecting part and the cover plate; the second fixing piece is arranged on the third insulating piece; the plate-shaped connecting part is provided with a second connecting piece, the second connecting piece is arranged through the cover plate and the third insulating piece and is fixedly connected with the second fixing piece.

[0021] The utility model discloses the beneficial effect lies in:

[0022] With copper-aluminum welding as the core conductive basis, the double constraints of the aluminum pole post fixed with the first insulating piece and the first connecting piece uniformly fastened are matched, forming scientific division of welding for power transmission and double fixation for stress: the welding position only bears the current transmission function, avoiding single bearing vibration stress and temperature cycle stress; the double fixation structure can disperse more than 90% of vibration impact and thermal expansion stress, reducing the welding residual stress by 60%, reducing the welding cracking rate to below 1% under the new energy vehicle 20g acceleration vibration and-40 DEG C to 125 DEG C wide temperature range cycle working condition, completely solving the pain points of electrolyte leakage and increasing connection resistance, and guaranteeing long-term stability of heterogeneous connection.

[0023] The aluminum pole post is fixedly connected with the first insulating piece, and the first connecting piece is uniformly distributed around the aluminum pole post and fixedly connected with the first fixing piece, forming double positioning in the radial and axial directions: effectively limiting the radial deviation and axial movement of the pole post, the displacement of the pole post being controlled to be within 0.02mm, avoiding tearing of the copper-aluminum welding surface caused by vibration impact; at the same time, the cooperation precision of the pole post and the mounting hole is long-term stable, the current transmission continuity is improved by 80%, the safety hazards such as conductive discontinuity and arc discharge caused by pole post displacement are eliminated, and the scenes such as bumpy driving of new energy vehicles and frequent moving of mobile energy storage equipment are adapted. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the present application and, together with their description, serve to explain the application.

[0025] In addition, throughout the drawings, the same or similar reference numerals designate the same or similar elements. It should be understood that the drawings are schematic, and the elements and elements are not necessarily drawn according to the scale.

[0026] In the drawings:

[0027] Figure 1It is structural diagram of power battery top cover structure in the embodiment of the utility model.

[0028] Figure 2 For Figure 1 It is sectional view of power battery top cover structure in the embodiment shown.

[0029] Figure 3 For Figure 2 The enlarged view of A in the figure.

[0030] Figure 4 For Figure 2 The enlarged view of B in the figure.

[0031] Figure 5 For Figure 1 It is the explosion schematic diagram of power battery top cover structure in the embodiment shown.

[0032] The meaning of the reference signs in the figure is as follows:

[0033] 100, cover plate, 101, first mounting hole, 102, platform part, 103, first positioning groove, 104, second mounting hole, 200, first pole assembly, 201, first conductive pole, 2011, aluminum pole, 2012, copper pole, 2013, welding connection part, 2014, first connecting piece, 2015, welding connection groove, 202, first fixing piece, 2021, second through hole, 203, first insulating piece, 2031, placing groove, 2032, first through hole, 2033, reinforcing part, 2034, fifth through hole, 204, second insulating piece, 2041, mounting convex part, 2042, abutting part, 2043, second positioning groove, 2044, fourth through hole, 205, first sealing piece, 2051, positioning piece, 2052, third through hole, 300, second pole assembly, 301, second conductive pole, 3011, pole convex part, 3012, plate-shaped connecting part, 3013, second connecting piece, 302, second fixing piece, 303, second sealing piece, 304, third insulating piece. DETAILED DESCRIPTION

[0034] Embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While several embodiments of the disclosure are shown in the drawings, it is understood that the disclosure can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the disclosure to those skilled in the art. It should be understood that the drawings and embodiments are only for illustrative purposes and are not intended to limit the scope of protection of the disclosure.

[0035] In addition, it needs to be noted that only parts related to the utility model are shown in the drawings for the convenience of description. The embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0036] It should be noted that the concepts of “first”, “second” and the like mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0037] It should be noted that the modification of “one” or “multiple” mentioned in the present disclosure is illustrative but not restrictive, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as “one or more”.

[0038] The names of the messages or information exchanged between the plurality of devices in the embodiments of the present disclosure are only for illustrative purposes, and are not used to limit the scope of the messages or information.

[0039] The present disclosure will be described in detail below with reference to the drawings and in combination with the embodiments.

[0040] As shown in Figures 1-5 A power battery top cover structure includes a cover plate 100, a second pole assembly 300 and a first pole assembly 200.

[0041] As shown in Figure 3 The first pole assembly 200 includes a first conductive pole 201, a first insulating piece 203, a first fixing piece 202 and a first sealing piece 205.

[0042] The cover plate 100 is covered at the opening of the battery shell for mounting the second pole assembly 300 and the first pole assembly 200; the first pole assembly 200 is arranged on the cover plate 100 for serving as the negative connection end of the battery pack; the cover plate 100 is provided with a first mounting hole 101 and a second mounting hole 104, the first mounting hole 101 is used for mounting the first pole assembly 200, and the second mounting hole 104 is used for mounting the second pole assembly 300; the first pole assembly 200 includes a copper pole 2012 and an aluminum pole 2011, the copper pole 2012 is in a plate structure, the aluminum pole 2011 is in a column structure, the aluminum pole 2011 is welded on the copper pole 2012, so that the copper pole 2012 is arranged protruding from the aluminum pole 2011; a first insulating piece 203 and a first fixing piece 202 are arranged on the first mounting hole 101, the first insulating piece 203 and the copper pole 2012 are respectively arranged at the front surface and the back surface of the cover plate 100, the aluminum pole 2011 passes through a fifth through hole 2034 of the first insulating piece 203, and the copper pole 2012 and the back surface of the cover plate 100 are sealed by a first sealing piece 205, so that the first sealing piece 205 is clamped between the copper pole 2012 and the cover plate 100; the first fixing piece 202 is arranged on the first insulating piece 203, and the side wall of the aluminum pole 2011 is fixedly connected to the inner wall of the fifth through hole 2034; the copper pole 2012 is provided with a plurality of first connecting pieces 2014, the plurality of first connecting pieces 2014 are uniformly arranged around the aluminum pole 2011, and the first connecting pieces 2014 are arranged in the first insulating piece and fixedly connected to the first fixing piece 202, so that the first insulating piece is clamped between the first fixing piece 202 and the copper pole 2012.

[0043] The fixed connection of the first connecting piece 2014 and the aluminum pole 2011 can effectively resist external force impact and vibration. In actual application, the battery is inevitably subjected to various external forces, especially on new energy vehicles, the vehicle is in a continuous bumping state during driving. The application can ensure that the battery pack still maintains good performance in complex environments through the mode of adding the first connecting piece 2014 for fixed connection.

[0044] The aluminum pole 2011 is provided with a welding connecting part 2013, and the copper pole 2012 is provided with a welding connecting groove 2015, the welding connecting part 2013 is embedded in the welding connecting groove 2015, and the cross section of the welding connecting part 2013 is larger than that of the aluminum pole 2011. The welding connecting part 2013 with a larger cross section is embedded in the welding connecting groove 2015, which increases the contact area of the two, thereby improving the firmness of welding and the conductivity, reducing the contact resistance, reducing the risk of heating, and improving the efficiency and stability of current transmission. On the other hand, this structure can better disperse stress, avoid stress concentration at the welding position when the battery is subjected to vibration or impact, effectively prevent cracking and loosening of the welding position, and further protect the reliability and service life of the first pole assembly 200.

[0045] The welding connecting part 2013 is a plate-shaped rectangular structure, and an arc surface is arranged at the end point of the welding connecting part 2013. This design not only increases the contact area of the welding connecting part 2013 and the welding connecting groove 2015, but also effectively avoids stress concentration. During the use of the battery, various forces will inevitably act on it, and the design of the arc surface can uniformly disperse these forces to prevent the welding connecting part 2013 from being damaged due to stress concentration. At the same time, the plate-shaped rectangular structure also facilitates the positioning and welding operation of the aluminum pole column 2011 and the copper pole column 2012, improving the production efficiency and product quality.

[0046] Specifically, the copper pole column 2012 and the aluminum pole column 2011 are connected together by friction welding, laser welding or ultrasonic welding. Friction welding uses the heat generated by the contact surface friction of the workpiece to realize welding, and the heat generated during the process is concentrated, the quality of the welded joint is high, and problems such as weld porosity and cracks can be effectively avoided, ensuring the reliability of the copper-aluminum connection. Laser welding uses a high-energy-density laser beam as a heat source, has fast welding speed, small heat-affected zone, and can accurately control the welding process, reduce stress concentration caused by differences in thermal expansion coefficient, and improve the stability and consistency of the welding. Ultrasonic welding is achieved by ultrasonic vibration to make the surfaces of the welding parts rub against each other, which does not require additional filler materials, the welding process is clean and pollution-free, and can be performed at a relatively low temperature, with less impact on the performance of copper and aluminum materials.

[0047] Further, a platform part 102 is arranged on the inner wall of the first mounting hole 101, the platform part 102 is arranged on the inner wall of the through hole, the platform part 102 is a circular ring structure, the platform part 102 divides the first mounting hole 101 into an upper mounting cavity and a lower mounting cavity, the copper pole column 2012 is arranged in the lower mounting cavity, and the aluminum pole column 2011 penetrates into the upper mounting cavity from the lower mounting cavity, and the top thereof penetrates out of the upper mounting cavity. The upper mounting cavity provides a passage for the aluminum pole column 2011 to penetrate out, ensuring that it can be connected with an external circuit; the lower mounting cavity accommodates the copper pole column 2012, so that the copper pole column 2012 has a larger contact area with the cover plate 100, further disperses stress, and improves the stability of the connection. At the same time, the platform part 102 serves as a separation structure of the upper mounting cavity and the lower mounting cavity, not only plays a positioning and supporting role, but also provides a reference for the installation of other components.

[0048] The power battery top cover structure further comprises a second insulating piece 204, and the first insulating piece 203 and the second insulating piece 204 are respectively arranged on both sides of the cover plate 100. The first insulating piece 203 and the second insulating piece 204 are both made of plastic, and the arrangement of the first insulating piece 203 and the second insulating piece 204 can effectively prevent current leakage and improve the safety of the battery. The first insulating piece 203 is located above the cover plate 100, and the second insulating piece 204 is located below the cover plate 100, and the two cooperate with each other to form a complete insulation system.

[0049] The first insulating piece 203 is provided with a first through hole 2032, and the first fixing piece 202 is provided with a second through hole 2021. The first through hole 2032 and the second through hole 2021 are aligned, the first connecting piece 2014 is in the form of a rod body structure, the first connecting piece 2014 is arranged in the first through hole 2032 and the second through hole 2021 and is fixed to the inner wall of the second through hole 2021 by riveting, the cross section of the first connecting piece 2014 is in the form of a rectangle, the contact area between the side wall of the first connecting piece 2014 and the second through hole 2021 is increased, and the fixing effect of the first connecting piece 2014 and the second through hole 2021 is improved. The riveting fixing mode can not only ensure the connection strength between the first connecting piece 2014 and the first fixing piece 202, but also can buffer the vibration generated during the driving of the new energy vehicle to a certain extent. When the vehicle is driving, the vibration will be transmitted to the first pole assembly 200 structure through the battery, and the riveting connection makes the combination between the first connecting piece 2014 and the first fixing piece 202 more compact and less likely to loosen due to vibration.

[0050] Meanwhile, the rectangular cross section of the first connecting piece 2014 can better limit the rotation of the first connecting piece 2014 when cooperating with the second through hole 2021, compared with the traditional circular cross section. During the installation and use of the battery, various directional forces may be applied, and if the first connecting piece 2014 can rotate, it may cause problems in the cooperation with other components and affect the stability of the entire first pole assembly 200 structure. The first connecting piece 2014 with a rectangular cross section can effectively avoid such a situation.

[0051] In addition, the plastic material of the first insulating piece 203 and the second insulating piece 204 has good insulation performance and a certain elasticity. During the operation of the battery, a certain amount of heat will be generated, and the plastic material can absorb heat to a certain extent, reducing the influence of heat on the first pole assembly 200 structure. Moreover, its elasticity can buffer vibration and impact, further protecting the first pole assembly 200 structure from being damaged.

[0052] Further, the fifth through hole 2034 side wall is provided with an extension part, the diameter of the extension part corresponds to the inner diameter of the platform part 102, the extension part is fixedly connected with the aluminum pole column 2011 by injection molding or the like, and the extension part increases the contact area between the aluminum pole column 2011 and the first insulating part 203, so that the connection between the aluminum pole column 2011 and the first insulating part 203 is more stable. At the same time, the extension part corresponds to the inner diameter of the platform part 102, which can accurately position the installation position of the first insulating part 203, and ensure the assembly accuracy of the whole first pole assembly 200 structure.

[0053] The first through hole 2032 side wall is provided with a reinforcing part 2033, and the reinforcing part 2033 is an annular protrusion arranged on the first through hole side wall. The platform part 102 is provided with a first positioning groove 103, the reinforcing part 2033 is inserted into the first positioning groove 103, the first connecting piece 2014 is arranged in the first positioning groove 103, and the first connecting piece 2014 and the inner wall of the first positioning groove 103 have a gap, so as to avoid the short circuit caused by the direct contact between the first connecting piece 2014 and the cover plate 100. The cooperation between the reinforcing part 2033 and the first positioning groove 103 further enhances the connection stability between the first insulating part 203 and the platform part 102, and prevents the first insulating part 203 from being displaced or shaken during the use of the battery. By inserting the reinforcing part 2033 into the first positioning groove 103, the current can be effectively shielded and guided, avoiding the leakage or abnormal flow of current in the first pole assembly 200 structure, and improving the safety and stability of the battery. At the same time, this positioning method also makes the installation of the first insulating part 203 more accurate and convenient, and improves the production and assembly efficiency.

[0054] The first fixing part 202 is made of metal, and the first insulating part 203 is provided with a placing groove 2031, and the first fixing part 202 is arranged in the placing groove 2031. The placing groove 2031 on the first insulating part 203 provides a stable mounting space for the first fixing part 202, so that the first fixing part 202 can be accurately installed on the first insulating part 203, further ensuring the accuracy and stability of the connection between the first connecting piece 2014 and the first fixing part 202. Moreover, the design of the placing groove 2031 can also prevent the first fixing part 202 from being displaced during use, thereby ensuring the reliability of the first pole assembly 200 structure.

[0055] Further, the second insulating piece 204 is provided with two mounting protrusions 2041, which are respectively inserted into the first mounting hole 101 and the second mounting hole 104. The mounting protrusion 2041 is provided with a fourth through hole 2044, and the aluminum pole 2011 is arranged in the fourth through hole 2044. The fourth through hole 2044 is provided with an abutting portion 2042, which is clamped between the copper pole 2012 and the platform portion 102. On the one hand, the mounting protrusion 2041 is inserted into the lower cavity, which further enhances the connection tightness between the second insulating piece 204 and the cover plate 100, so that the second insulating piece 204 can be firmly fixed below the cover plate 100, preventing it from loosening or shifting during battery use. On the other hand, the abutting portion 2042 is clamped between the copper pole 2012 and the platform portion 102, which not only increases the stability of the structure, but also has a certain buffering effect. When the battery is impacted or vibrated by external force, the abutting portion 2042 can absorb part of the energy, reducing the damage to the copper pole 2012 and the platform portion 102.

[0056] At the same time, the existence of the abutting portion 2042 can further optimize the contact between the copper pole 2012 and the platform portion 102, so that the stress distribution between them is more uniform. This helps to improve the conductivity of the entire first pole assembly 200 structure, reduces the resistance caused by poor contact, thereby reducing the probability of heat generation and improving the energy transmission efficiency of the battery.

[0057] The first sealing piece 205 is arranged between the copper pole 2012 and the platform portion 102. The first sealing piece 205 is provided with a third through hole 2052, which is aligned with the first through hole 2032, and the first connecting piece 2014 passes through the third through hole 2052. The first sealing piece 205 is arranged to prevent electrolyte leakage and protect the internal structure of the battery from the influence of the external environment. The third through hole 2052 is aligned with the first through hole 2032, ensuring that the first connecting piece 2014 can pass through smoothly and connect with the first fixing piece 202. Moreover, the material of the first sealing piece 205 usually has good corrosion resistance and sealing performance, which can effectively block the leakage of electrolyte and prolong the service life of the battery.

[0058] A plurality of positioning members 2051 are arranged on the side wall of the first sealing member 205, a plurality of second positioning grooves 2043 are arranged on the abutting portion 2042, and the positioning members 2051 are inserted into the second positioning grooves 2043. The positioning members 2051 are protrusions arranged on the side wall of the first sealing member 205, the second positioning grooves 2043 are grooves arranged on the abutting portion 2042, and the protrusions and the grooves are both rectangular structures, facilitating the fixation of the first sealing member 205. This positioning mode enables the first sealing member 205 to be accurately installed between the copper pole post 2012 and the platform portion 102, ensuring the reliability of the sealing effect. The cooperation between the positioning members 2051 and the second positioning grooves 2043 also prevents the first sealing member 205 from rotating or shifting during use, ensuring that it is always in the best sealing position. Through this precise positioning, the sealing performance and stability of the entire first pole post assembly 200 structure can be improved, providing a strong guarantee for the safe operation of the battery.

[0059] As shown in Figure 4 The second pole post assembly 300 includes a second conductive pole post 301, a third insulating member 304, a second fixing member 302, and a second sealing member 303. The second conductive pole post 301 includes a plate-shaped connecting portion 3012 and a pole post protruding portion 3011, and a plurality of second connecting members 3013 are arranged on the plate-shaped connecting portion 3012. The outer shape of the second conductive pole post 301 is the same as that of the first conductive pole post 201, the structure of the second connecting members 3013 is the same as that of the first connecting members 2014, the structure of the third insulating member 304 is the same as that of the first insulating member 203, the structure of the second fixing member 302 is the same as that of the first fixing member 202, the structure of the second sealing member 303 is the same as that of the first sealing member 205, and the connection mode of the second conductive pole post 301 with the third insulating member 304, the second fixing member 302, and the second sealing member 303 is the same as that of the first conductive pole post 201 with the first insulating member 203, the first fixing member 202, and the first sealing member 205.

[0060] The entire power battery top cover structure, through the reasonable design of the second pole post assembly 300 and the first pole post assembly 200 and the close cooperation between the components, not only improves the safety, stability, and conductivity of the battery, but also effectively resists external force impact and vibration, adapts to complex use environments, and provides strong support for the development of new energy vehicles and other fields. At the same time, this structural design is also convenient for production and assembly, improves production efficiency and product quality, reduces production cost, and has good market application prospects.

[0061] The above description is merely some of the preferred embodiments of the present disclosure and a description of the principles of the technology used. It should be understood by those skilled in the art that the scope of the utility model involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combinations of the above technical features or equivalent features without departing from the above utility model concept. For example, the above features are replaced with each other to form a technical solution with similar functions disclosed in the embodiments of the present disclosure (but not limited to).

Claims

1. A power cell top cover structure, characterized in that: The utility model relates to a cover plate (100) is provided with first mounting hole (101) on the cover plate (100), first pole assembly (200) includes first conductive pole (201), first insulating piece (203) and first fixed part (202), first conductive pole (201) includes mutually welded connection's copper pole (2012) and aluminium pole (2011), first insulating piece (203) and copper pole (2012) are located at the opposite setting positive side and back surface position of cover plate (100) respectively, aluminium pole (2011) at least partial passes through first mounting hole (101) and the fifth through -hole (2034) of first insulating piece (203), and copper pole (2012) is sealed between the back surface of cover plate (100) through first sealing element (205), so that first sealing element (205) is clamped between copper pole (2012) and cover plate (100), first fixed part (202) is set up on first insulating piece, first connecting piece (2014) is set up on copper pole (2012), first connecting piece (2014) passes through first insulating piece (203) and is fixedly connected with first fixed part (202). First connecting piece (2014) is provided with a plurality of, and a plurality of first connecting piece (2014) is uniformly arranged around aluminium pole (2011). Aluminium pole (2011) is provided with welding connection part (2013), and copper pole (2012) is provided with welding connection groove (2015), welding connection part (2013) is embedded in welding connection groove (2015).

2. The power battery top cover structure according to claim 1, characterized in that: The cross section of the welding connection part (2013) is larger than the cross section of the aluminum pole (2011).

3. The power cell top cover structure of claim 1, wherein: The welding connection part (2013) is a plate-shaped rectangular structure, and the end point of the welding connection part (2013) is provided with a circular arc surface.

4. The power battery top cover structure according to claim 3, characterized in that: The copper pole (2012) and the aluminum pole (2011) are connected by friction welding, laser welding or ultrasonic welding.

5. The power cell top cover structure of claim 3, wherein: Further comprising a second insulating piece (204), the second insulating piece (204) is arranged on the same side of the copper pole (2012) and the cover plate (100), the second insulating piece (204) is provided with a fourth through hole (2044) for the aluminum pole (2011) to pass through, and the fourth through hole (2044) is aligned with the first mounting hole (101).

6. The power cell top cover structure of claim 1, wherein: The first insulating piece (203) is provided with a first through hole (2032), the first fixed part (202) is provided with a second through hole (2021), the first through hole (2032) and the second through hole (2021) are aligned, the first connecting piece (2014) is arranged in the first through hole (2032) and the second through hole (2021) and is fixedly connected to the inner wall of the second through hole (2021).

7. The power cell top cover structure of claim 1, wherein: The first connecting piece (2014) is a rod structure, and the cross section of the first connecting piece (2014) is a rectangular structure.

8. The power cell top cover structure of claim 7, wherein: Further comprising a second pole assembly (300).

9. The power cell top cover structure of claim 8, wherein: ​ 10. The power cell top cover structure of claim 1, wherein: ​ The cover plate (100) is provided with a second mounting hole (104); The second pole assembly (300) comprises a second conductive pole (301), a third insulating piece (304) and a second fixing piece (302), the second conductive pole (301) comprises a plate-shaped connecting part (3012) and a pole protruding part (3011), the third insulating piece (304) and the plate-shaped connecting part (3012) are respectively located at the front surface and the back surface of the cover plate (100), the pole protruding part (3011) at least partially penetrates through the second mounting hole (104) and the through hole of the third insulating piece (304), and the plate-shaped connecting part (3012) and the back surface of the cover plate (100) are sealed by a second sealing piece (303), so that the second sealing piece (303) is clamped between the plate-shaped connecting part (3012) and the cover plate (100); the second fixing piece (302) is arranged on the third insulating piece (304); the plate-shaped connecting part is provided with a second connecting piece (3013), the second connecting piece (3013) penetrates through the cover plate (100) and the third insulating piece (304) and is fixedly connected with the second fixing piece (302).

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