Top cover assembly, battery monomer, energy storage device and energy storage system

Abstract

The utility model discloses a top cover assembly, a battery monomer, an energy storage device and an energy storage system, the top cover assembly comprises a polished aluminum sheet, the polished aluminum sheet is provided with a first pole hole, the outer side surface of the polished aluminum sheet forms a limiting ring table, and a mounting sinking groove surrounding the first pole hole is formed in the limiting ring table; the first plastic part is mounted on the outer side surface of the light aluminum sheet, the first plastic part comprises a first plastic main body, the first plastic main body is mounted in the mounting sinking groove, the first plastic main body is provided with a second pole hole through which a pole penetrates, and a containing sinking groove surrounding the second pole hole is formed in the first plastic main body; a pole pressing block matched with the pole in a limiting manner is mounted in the accommodating sinking groove; the outer side face of the light aluminum sheet is higher than the inner bottom wall of the installation sinking groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage technical field especially relates to a top cap subassembly, have the battery monomer with this top cap subassembly, have the energy storage device with this battery monomer and have the energy storage system with this energy storage device. BACKGROUND

[0002] In the related art, the top cap subassembly usually includes a pole, a first plastic part, an aluminum sheet, a second plastic part, and a pole pressing block, the first plastic part and the second plastic part are respectively installed on both sides of the aluminum sheet, the pole is arranged through the first plastic part, the aluminum sheet, and the second plastic part, and the pole pressing block is installed on the side of the first plastic part away from the aluminum sheet. The conventional top cap subassembly needs to use a high-strength material such as polyphenylene sulfide (PPS) with a higher cost for the first plastic part to ensure the torsional strength, which leads to a high overall cost of the top cap subassembly and leaves room for improvement. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, the utility model provides a top cap subassembly, the cooperation depth of the first plastic part and the aluminum sheet of the top cap subassembly is large, the strength requirement of the first plastic part is low, the first plastic part can use a material with a lower cost, and the overall cost of the top cap subassembly can be reduced.

[0004] The top cap subassembly according to the utility model embodiment comprises an aluminum sheet, the aluminum sheet is provided with a first pole hole, the outer side surface of the aluminum sheet forms a limiting ring table, and a mounting groove is formed in the limiting ring table and arranged around the first pole hole; a first plastic part is installed on the outer side surface of the aluminum sheet, the first plastic part comprises a first plastic main body, the first plastic main body is installed in the mounting groove, the first plastic main body is provided with a second pole hole for arranging a pole, an accommodating groove is formed in the first plastic main body and arranged around the second pole hole, and a pole pressing block in limiting cooperation with the pole is installed in the accommodating groove; and the outer side surface of the aluminum sheet is higher than the inner bottom wall of the mounting groove.

[0005] The top cap subassembly according to the utility model embodiment can set a mounting groove with a larger depth in the aluminum sheet for installing the first plastic part and the pole pressing block, thereby facilitating the limiting support of the aluminum sheet on the first plastic part and the pole pressing block, reducing the local stress of the first plastic part and the pole pressing block, reducing the requirement for the structural strength of the first plastic part and the pole pressing block, and allowing the first plastic part to be made of a material with a lower cost to reduce the setting cost of the top cap subassembly.

[0006] According to the top cover assembly of some embodiments of the present application, the first plastic main body comprises a side plate part and a bottom plate part connected by bending, the bottom plate part is located between the inner bottom wall of the mounting groove and the pole pressing block, the limiting ring table has an inner ring surface for limiting the mounting groove, the side plate part is located between the inner ring surface and the pole pressing block, and the side plate part is arranged around the pole pressing block.

[0007] According to the top cover assembly of some embodiments of the present application, the first plastic part further comprises a limiting flange, the limiting flange is connected to the outer peripheral wall of one end of the side plate part away from the bottom plate part, the limiting ring table forms a ring table end face at one end away from the aluminum sheet, and the limiting flange is limited and pressed on the ring table end face.

[0008] According to the top cover assembly of some embodiments of the present application, in the axial projection along the pole, the accommodating groove is located in the mounting groove.

[0009] According to the top cover assembly of some embodiments of the present application, in the axial direction of the pole, the depth of the mounting groove is D, and it satisfies: D≥2mm.

[0010] According to the top cover assembly of some embodiments of the present application, the depth of the mounting groove in the axial direction of the pole is greater than half of the height of the first plastic main body in the axial direction of the pole, and / or the depth of the accommodating groove in the axial direction of the pole is greater than half of the height of the pole pressing block in the axial direction of the pole, and / or the depth of the mounting groove in the axial direction of the pole is greater than the height of the limiting ring table in the axial direction of the pole.

[0011] According to the top cover assembly of some embodiments of the present application, in the axial direction of the pole, the height of the part of the pole pressing block located in the mounting groove is greater than or equal to half of the depth of the mounting groove.

[0012] According to the top cover assembly of some embodiments of the present application, the first plastic part is made of polypropylene material.

[0013] According to the top cover assembly of some embodiments of the present application, further comprising a second plastic part, the second plastic part is located on the side of the aluminum sheet away from the first plastic part, the second plastic part is provided with a third pole hole for penetrating the pole, and / or a sealing element is arranged between the inner wall of the first pole hole and the outer peripheral wall of the pole.

[0014] The utility model also proposes a battery monomer.

[0015] The battery monomer according to the embodiments of the present application comprises the top cover assembly of any one of the above embodiments.

[0016] This utility model also proposes an energy storage device.

[0017] The energy storage device according to the present invention includes a battery cell of any of the above embodiments.

[0018] This utility model also proposes an energy storage system.

[0019] The energy storage system according to the present invention includes the energy storage device of any of the above embodiments.

[0020] The advantages of the battery cell, the energy storage device, the energy storage system, and the aforementioned top cover assembly compared to the prior art are the same, and will not be repeated here.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the top cover assembly according to an embodiment of the present utility model;

[0024] Figure 2 This is an exploded view of the top cover assembly according to an embodiment of the present utility model;

[0025] Figure 3 This is an exploded view (top view) of the top cover assembly according to an embodiment of the present invention;

[0026] Figure 4 This is a cross-sectional view (front view) of the top cover assembly according to an embodiment of the present utility model;

[0027] Figure 5 This is a cross-sectional view (stereoscopic view) of the top cover assembly according to an embodiment of the present utility model;

[0028] Figure 6 This is a cross-sectional view of the top cover assembly (without any flange) according to an embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of an energy storage system according to some embodiments of the present invention;

[0030] Figure 8 This is a schematic diagram of an energy storage system according to other embodiments of the present invention;

[0031] Figure 9 This is a schematic diagram of a battery cell according to some embodiments of the present invention.

[0032] Reference signs:

[0033] Top cover assembly 100,

[0034] Aluminum sheet 1, limiting ring table 11, inner ring surface 111, ring table end surface 112, installation sink 12, outer side 13, inner side 14, first pole hole 15,

[0035] First plastic part 2, first plastic body 21, side plate 211, bottom plate 212, limiting flange 22, containing sink 23, second pole hole 24,

[0036] Second plastic part 3, third pole hole 31, pole pressing block 4, pressing block perforation 41, limiting step 42, pole 5, limiting boss 51, current collector plate 6, sealing element 7;

[0037] Battery monomer 200, battery shell 201, battery core 202, energy storage device Y, energy storage system Z, electric energy conversion device Z2, first user load Z3, second user load Z4, high-voltage cable Z410, first electric energy conversion device Z420, second electric energy conversion device Z430. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0039] In the present application, it should be noted that, since the energy required by people has strong time and space, in order to reasonably use energy and improve the utilization rate of energy, it is necessary to store one form of energy by a medium or device into the same or another form of energy, and release it in a specific energy form based on future application needs. At present, the main way to generate green electricity is to develop photovoltaic, wind power and other green energy to replace fossil energy.

[0040] At present, the generation of green electricity generally depends on photovoltaic, wind power, water potential, etc., and wind power and solar energy generally have strong intermittency and large volatility, which can cause unstable power grid, insufficient electricity at peak electricity demand, too much electricity at low electricity demand, and unstable voltage which can damage power, thus causing "abandoned wind and light" problem due to insufficient electricity demand or insufficient grid accommodation capacity. To solve these problems, energy storage is needed. That is, the electrical energy is converted into other forms of energy by physical or chemical means and stored, and the energy is converted into electrical energy and released when needed. In short, energy storage is similar to a large "power bank", which stores electrical energy when photovoltaic and wind power is sufficient, and releases stored electrical energy when needed.

[0041] Taking electrochemical energy storage as an example, the utility model provides an energy storage device Y, which is provided with a group of chemical batteries in the energy storage device Y, mainly using chemical elements in the battery as energy storage medium, and the charging and discharging process is accompanied by chemical reaction or change of the energy storage medium. In short, the electrical energy generated by wind power and solar energy is stored in the chemical battery, and the stored electrical energy is released for use when the use of external electrical energy reaches the peak, or is transferred to a place where the electrical energy is in short supply for use.

[0042] At present, the energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage and power consumption side energy storage, and the corresponding types of energy storage devices Y include:

[0043] (1) Large-scale energy storage power station applied in wind power and photovoltaic power station side, which can assist renewable energy power generation to meet grid connection requirements and improve renewable energy utilization rate; the energy storage power station as a high-quality active / reactive power regulation power source in the power supply side can realize load matching of electrical energy in time and space, enhance renewable energy consumption capacity, reduce instantaneous power change, reduce impact on power grid, improve new energy power generation consumption problem and has great significance in power grid system backup, relieving peak load power supply pressure and peak regulation;

[0044] (2) Energy storage container applied in power grid side, the main functions of which are peak regulation, frequency regulation and relieving power grid congestion, which can realize peak clipping and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low, and releasing the stored electrical energy when the electricity load is high, so as to realize the balance between power production and consumption;

[0045] (3) Small energy storage cabinet applied in power consumption side, the main functions of which are power self-generation and self-use, peak-valley price difference arbitrage, capacity cost management and improvement of power supply reliability. According to different application scenarios, the power consumption side energy storage can be divided into industrial and commercial energy storage cabinet, household energy storage device and energy storage charging pile, which is generally used with distributed photovoltaic.

[0046] Industrial and commercial users can utilize energy storage for peak-valley price arbitrage and capacity cost management. In electricity markets implementing peak-valley pricing, charging energy storage systems during low-price periods and discharging them during high-price periods allows for arbitrage, reducing electricity costs. Furthermore, industrial enterprises using two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge it during peak load periods, thereby reducing peak power demand and the maximum declared demand, thus lowering capacity charges. Residential photovoltaic (PV) systems with energy storage can improve self-consumption levels. High electricity prices and poor power supply stability drive demand for residential PV installations. Considering that PV generates electricity during the day while user load is generally higher at night, configuring energy storage allows for better utilization of PV power, improving self-consumption levels and reducing electricity costs. Additionally, communication base stations, data centers, and other fields require energy storage for backup power.

[0047] Based on the application scenarios of the above-mentioned energy storage devices, this utility model also proposes an energy storage system Z, which includes the energy storage device Y described in the above embodiments. The energy storage system Z can be a residential energy storage system or a public energy storage system.

[0048] Specifically, please see Figure 6 This invention describes a residential energy storage system according to some embodiments of the present invention, using a home energy storage scenario in user-side energy storage as an example. The accompanying drawings are schematic diagrams of energy storage device Y in a residential setting. It is important to note that the energy storage device Y in this application is not limited to home energy storage scenarios. Figure 6 As shown, the residential energy storage system includes a power conversion device Z2 (photovoltaic panel), a first user load Z3 (streetlight), a second user load Z4 (e.g., household appliances such as air conditioners), and an energy storage device Y. The energy storage device Y is a small energy storage box that can be wall-mounted to an outdoor wall. Specifically, the photovoltaic panel converts solar energy into electricity during periods of low electricity prices. The energy storage device Y stores this electricity and supplies it to streetlights and household appliances during peak electricity prices, or provides power during grid outages / power failures.

[0049] And, please see Figure 7 This invention describes a public energy storage system in some embodiments of the present invention. The public energy storage system is illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device Y in this application is not limited to this generation / distribution side energy storage scenario. Figure 7As shown, the public energy storage system comprises a high-voltage cable Z410, a first electric energy conversion device Z420, a second electric energy conversion device Z430, and an energy storage device Y provided by the application. In the case of power generation, the first electric energy conversion device Z420 and the second electric energy conversion device Z430 are used to convert other forms of energy into electric energy, and are connected with the high-voltage cable Z410 and supplied to the power distribution network for use. When the power load is low, the first conversion device Z420 and the second electric energy conversion device Z430 generate excess power, which is stored in the energy storage device Y, reducing the rate of abandoned wind and light, and improving the problem of new energy power generation consumption. When the power load is high, the grid issues an instruction to transmit the electric energy stored in the energy storage device Y in cooperation with the high-voltage cable Z410 in the grid-connected mode to supply the power side for use, providing peak shaving, frequency modulation, backup and other services for grid operation, fully playing the role of grid peak shaving, promoting grid peak shaving and valley filling, and relieving the power supply pressure of the grid.

[0050] Optionally, the first electric energy conversion device Z420 and the second electric energy conversion device Z430 can convert at least one of solar energy, light energy, wind energy, heat energy, tidal energy, biomass energy and mechanical energy into electric energy.

[0051] The number of energy storage devices Y can be multiple, and multiple energy storage devices Y are connected in series or parallel with each other, and multiple energy storage devices Y are supported and electrically connected by isolation plates (not shown in the figure). In the embodiment, "multiple" means two or more. The energy storage device Y can also be provided with an energy storage box outside for accommodating the energy storage device Y.

[0052] In some embodiments, the energy storage device Y of the utility model can include but is not limited to a battery module, a battery pack, a battery system, etc. The actual application form of the energy storage device Y provided by the application embodiment can be but is not limited to the listed products, and can also be other application forms, and the application form of the energy storage device Y is not strictly limited by the application embodiment. The application embodiment only takes the multi-core battery as an example for description. When the energy storage device Y includes a battery monomer 200, the battery monomer 200 can be at least one of a cylindrical battery, a square battery, etc.

[0053] Optionally, as shown, Figure 9 When the energy storage device Y includes a battery monomer 200, the battery monomer 200 includes a top cover assembly 100, and the battery monomer 200 can further include a battery shell 201, an electric core 202, one end of the battery shell 201 is open, the electric core 202 is installed in the battery shell 201, the top cover assembly 100 is installed at the open end of the battery shell 201 to close the open end of the battery shell 201, and the pole 5 of the top cover assembly 100 is connected with the electric core 202 through the current collecting disc 6.

[0054] The limiting ring table 11 is arranged on the outer side 13 of the light aluminum sheet 1 of the top cover assembly 100, the installation groove 12 with a greater depth can be arranged on the light aluminum sheet 1 for mounting the first plastic part 2 and the pole pressing block 4, thereby facilitating the light aluminum sheet 1 to limit and support the first plastic part 2 and the pole pressing block 4, reducing the local stress of the first plastic part 2 and the pole pressing block 4, reducing the requirement for the structural strength of the first plastic part 2 and the pole pressing block 4, reducing the setting cost of the top cover assembly 100, and thereby reducing the overall setting cost of the battery monomer 200.

[0055] Specifically, the following refers to Figures 1-5 The top cover assembly 100 according to the embodiment of the utility model is described, the cooperation depth of the light aluminum sheet 1 and the first plastic part 2 of the top cover assembly 100 is large, which is beneficial to reduce the strength requirement of the first plastic part 2, so that the first plastic part 2 is made of a material with lower cost, thereby reducing the overall cost of the top cover assembly 100.

[0056] As Figures 1-5 shown, the top cover assembly 100 according to one embodiment of the utility model comprises a light aluminum sheet 1 and a first plastic part 2. It should be noted that the top cover assembly 100 in the utility model can be a negative cover plate of the battery monomer 200, or can be a positive cover plate of the battery monomer 200, and the setting mode is flexible and optional.

[0057] In actual design, the top cover assembly 100 further comprises a pole 5, a second plastic part 3 and a pole pressing block 4. The light aluminum sheet 1 serves as the cover plate body of the top cover assembly 100, and the light aluminum sheet 1 has an inner side 14 and an outer side 13. The inner side 14 of the light aluminum sheet 1 is the side close to the inside of the battery after the top cover assembly 100 is installed on the battery monomer 200, and the outer side 13 of the light aluminum sheet 1 is the side close to the outside of the battery after the top cover assembly 100 is installed on the battery monomer 200, as Figures 1-5 shown in the figure, the upper side of the light aluminum sheet 1 is its outer side 13, and the lower side of the light aluminum sheet 1 is its inner side 14.

[0058] The first plastic part 2 is installed on the outer side of the light aluminum sheet 1, that is, the first plastic part 2 is located on the outer side of the light aluminum sheet 1, and the second plastic part 3 is arranged on the inner side of the light aluminum sheet 1. The pole 5 of the top cover assembly 100 is arranged through the first plastic part 2, the light aluminum sheet 1 and the second plastic part 3. Thus, one end of the pole 5 extends to the inner side of the light aluminum sheet 1 and the other end extends to the outer side of the light aluminum sheet 1. One end of the pole 5 is connected with the current collector plate 6 on the inner side of the light aluminum sheet 1, and then connected with the battery cell through the current collector plate 6. The other end of the pole 5 can be connected with the external electrical connection structure on the outer side of the light aluminum sheet 1. In this way, the pole 5 can conduct current between the inner side and the outer side of the top cover assembly 100.

[0059] The first plastic part 2 is located on the outer side of the aluminum sheet 1 to insulate and separate the pole post 5 from the outer side 13 of the aluminum sheet 1, meanwhile, the second plastic part 3 is located on the inner side of the aluminum sheet 1 to insulate and separate the pole post 5 from the outer side 13 of the aluminum sheet 1, and an insulating sealing ring can be arranged between the aluminum sheet 1 and the pole post 5, thereby insulating and separating the pole post 5 from the aluminum sheet 1, ensuring the reliability of the pole post 5 in conducting current, avoiding safety hazards caused by the top cover assembly 100 being electrified, and improving the safety of the top cover assembly 100 in use.

[0060] The aluminum sheet 1 is provided with a first pole post hole 15 penetrating in the thickness direction of the aluminum sheet 1, and the first plastic part 2 includes a first plastic main body 21 provided with a second pole post hole 24 for passing the pole post 5, the second pole post hole 24 penetrating in the thickness direction of the first plastic main body 21, the thickness direction of the aluminum sheet 1 is the same as the thickness direction of the first plastic main body 21, and both are along the thickness direction of the top cover assembly 100, thereby, in actual installation, the first pole post hole 15 and the second pole post hole 24 can be penetrated and aligned along the thickness direction of the top cover assembly 100, and then the pole post 5 can be passed through the first pole post hole 15 and the second pole post hole 24.

[0061] In the outer side 13 of the aluminum sheet 1, a limiting ring table 11 is formed, the limiting ring table 11 is formed with a mounting groove 12 surrounding the first pole post hole 15, the first plastic main body 21 is installed in the mounting groove 12, and the first plastic main body 21 is formed with a containing groove 23 surrounding the second pole post hole 24, and the containing groove 23 is installed with a pole post pressing block 4 limiting matched with the pole post 5.

[0062] Specifically, as shown in Figure 2 The outer side of the aluminum sheet 1 is formed with a limiting ring table 11, the limiting ring table 11 is formed with an upwardly open mounting groove 12, that is, the mounting groove 12 is formed downwardly recessed in the limiting ring table 11, the first pole post hole 15 is formed on the bottom wall of the mounting groove 12, the first pole post hole 15 penetrates the aluminum sheet 1 in the upward-downward direction, meanwhile, the first plastic main body 21 is formed with a containing groove 23 open upwardly, that is, the containing groove 23 is formed downwardly recessed in the first plastic main body 21, and the second pole post hole 24 is formed on the bottom wall of the containing groove 23, thereby, in installation, the pole post 5 passes through the second plastic part 3, the aluminum sheet 1 and the first plastic part 2 in sequence, and then the pole post pressing block 4 is installed from top to bottom into the containing groove 23, the pole post pressing block 4 is riveted and matched with the outer circumferential boss of the upper end of the pole post 5 in the containing groove 23, so that the upper end of the pole post 5 can pre-tighten the pole post pressing block 4 downwardly, so that the pole post pressing block 4 is pressed downwardly, so that the first plastic part 2 is pressed between the pole post pressing block 4 and the aluminum sheet 1.

[0063] Therefore, by arranging the limiting ring table 11 on the outer side 13 of the light aluminum sheet 1, the depth of the mounting recess 12 can be made larger, and the height of the first plastic main body 21 extending into the mounting recess 12 is also larger, that is, the matching length of the first plastic part 2 and the light aluminum sheet 1 is also larger, and therefore, the torsion force that can be borne between the first plastic part 2 and the light aluminum sheet 1 is also larger. At the same time, after the pole post pressing block 4 is arranged in the accommodating recess 23 and the pole post 5 is arranged through the pole post pressing block 4, the first plastic part 2 and the light aluminum sheet 1, the torsion force acting on the pole post 5 can be well dispersed to the pole post pressing block 4, the first plastic part 2 and the light aluminum sheet 1, thereby reducing the structural deformation of the pole post 5.

[0064] The outer side of the light aluminum sheet 1 is higher than the inner bottom wall of the mounting recess 12, and the mounting recess 12 is recessed by a certain depth compared with the outer side of the light aluminum sheet 1, that is, the depth of the mounting recess 12 not only includes the height of the outer side of the light aluminum sheet 1 protruding from the limiting ring table 11, but also includes the depth of the mounting recess 12 recessed compared with the outer side of the light aluminum sheet 1, and therefore, the overall depth of the mounting recess 12 can be larger.

[0065] In other words, the light aluminum sheet 1 has the mounting recess 12 with a sufficient depth to limit and match with the first plastic part 2, to realize the torsion force bearing of the pole post 5 and the limiting support of the first plastic main body 21. Such a design can reduce the requirement on the structural strength of the first plastic part 2, for example, the first plastic part 2 does not need to use polyphenylene sulfide (PPS) which has a larger structural strength but a higher cost, and can use polypropylene (PP) which has a relatively lower structural strength but a lower cost. Therefore, the structural stability of the first plastic part 2 can be ensured, and the first plastic part 2 is not prone to cracking, and the setting cost of the first plastic part 2 can be reduced.

[0066] According to the top cover assembly 100, by arranging the limiting ring table 11 on the outer side 13 of the light aluminum sheet 1, the mounting recess 12 with a larger depth can be arranged on the light aluminum sheet 1 to mount the first plastic part 2 and the pole post pressing block 4, thereby facilitating the light aluminum sheet 1 to limit and support the first plastic part 2 and the pole post pressing block 4, reducing the local stress of the first plastic part 2 and the pole post pressing block 4, and reducing the requirement on the structural strength of the first plastic part 2 and the pole post pressing block 4. The first plastic part 2 can be made of a material with a lower cost, and the setting cost of the top cover assembly 100 can be reduced.

[0067] In some embodiments, the first plastic main body 21 includes a side plate part 211 and a bottom plate part 212 connected by bending. Specifically, as shown in FIG. 1, the first plastic main body 21 includes the side plate part 211 and the bottom plate part 212 connected by bending. Figure 4 and Figure 6As shown, the side plate part 211 is configured as a ring-shaped enclosing plate structure, and the bottom plate part 212 is connected to the bottom of the side plate part 211, so that the side plate part 211 and the upper surface of the bottom plate part 212 jointly define an upwardly open accommodating groove 23, and the bottom plate part 212 is provided with a second pole column hole 24 for the pole column 5 to pass through.

[0068] In actual installation, the first plastic body 21 is installed from top to bottom into the installation groove 12, the pole column pressing block 4 is installed into the accommodating groove 23, i.e. into the space formed by the side plate part 211 and the bottom plate part 212, and the pole column 5 passes through the aluminum sheet 1, the bottom plate part 212 and the pole column pressing block 4. The bottom plate part 212 is located between the inner bottom wall of the installation groove 12 and the pole column pressing block 4, so that the pole column pressing block 4 can press the bottom plate part 212 towards the inner bottom wall of the installation groove 12 under the limiting action of the pole column 5, realizing compact and limiting installation.

[0069] The limiting ring table 11 has an inner ring surface 111 for defining the installation groove 12, the side plate part 211 is located between the inner ring surface 111 and the pole column pressing block 4, and the side plate part 211 is arranged around the pole column pressing block 4, so that the torsion of the pole column 5 can be transmitted to the pole column pressing block 4, then transmitted to the side plate part 211 by the pole column pressing block 4, and then transmitted to the inner ring surface 111 of the limiting ring table 11 by the side plate part 211, and then transmitted to the limiting ring table 11 and the aluminum sheet 1, thereby realizing effective limiting support of the first plastic part 2 and the pole column pressing block 4, reducing the strength requirement of the first plastic part 2 and the pole column pressing block 4, and facilitating cost reduction.

[0070] In some embodiments, the first plastic part 2 further comprises a limiting flange 22 connected to the outer peripheral wall of the end of the side plate part 211 away from the bottom plate part 212, and the limiting ring table 11 is formed with a ring table end surface 112 at the end away from the aluminum sheet 1, and the limiting flange 22 is limited to abut against the ring table end surface 112. Specifically, as shown in Figure 4 and Figure 5 As shown, the limiting flange 22 is connected to the outer peripheral wall of the upper end of the side plate part 211, and as shown in Figure 3 As shown, the limiting flange 22 is also configured as a ring shape, and the limiting flange 22 abuts against the upper end surface of the limiting ring table 11 at each position in the circumferential direction, and the upper end surface of the limiting ring table 11 is configured as the ring table end surface 112.

[0071] Therefore, by providing the limiting flange 22, the contact area between the first plastic part 2 and the aluminum sheet 1 can be increased, and the first plastic part 2 also forms a transverse wrapping of the limiting ring table 11, realizing multi-directional torsion prevention in the circumferential direction, and thereby the requirement of structural strength of the first plastic part 2 can be reduced.

[0072] Furthermore, the limiting flange 22 covers the ring end face 112 of the limiting ring platform 11, which can make the creepage distance between the first plastic part 2 and the pole post 5 and the light aluminum sheet 1 larger, thereby enhancing the insulation effect.

[0073] In some embodiments, in the axial projection along the pole post 5, the receiving groove 23 is located within the mounting groove 12, that is, along the axial projection of the pole post 5. Figures 1-5 In the vertical projection, the receiving groove 23 is located inside the mounting groove 12. In other words, the torque generated on the pole post 5 can pass through the pole post pressure block 4, the first plastic part 2, and the light aluminum sheet 1 in the radial direction of the pole post 5 from the inside to the outside. This allows the inner wall of the mounting groove 12 to provide limiting support for both the first plastic body 21 and the pole post pressure block 4 installed in the receiving groove 23. That is, the limiting ring platform 11 can provide limiting support for each of the main components on its inner side, which greatly improves the support strength of the pole post 5 and reduces the local stress of the first plastic part 2 and the pole post pressure block 4. This reduces the structural strength requirements of the first plastic part 2 and the pole post pressure block 4, which is conducive to flexibly reducing the overall setting cost of the top cover assembly 100.

[0074] In some embodiments, in the axial projection along the pole post 5, the pole post pressing block 4 is spaced apart from the limiting ring platform 11, and the pole post pressing block 4 is located inside the limiting ring platform 11. Thus, after the torque generated on the pole post 5 acts on the pole post pressing block 4, the pole post pressing block 4 can transmit the torque to the limiting ring platform 11 through the side plate portion 211, thereby achieving torque dispersion.

[0075] Therefore, the pole post pressure block 4 does not need to transmit torque on the outside of the limiting ring platform 11, thereby reducing the structural strength requirements of the pole post pressure block 4.

[0076] In some embodiments, the depth of the mounting groove 12 along the axial direction of the pole post 5 is D, and satisfies: D≥2mm. The depth of the mounting groove 12 can be set to be greater than or equal to 2mm. For example, the depth D of the mounting groove 12 can be set to 2mm, 2.1mm, 2.3mm, 2.4mm, 2.5mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.5mm, 3.7mm, 3.8mm, 4.1mm, etc., or it can be set to other parameter values ​​according to actual needs.

[0077] Therefore, when the first plastic body 21 is installed in the mounting groove 12, the mating depth between the first plastic body 21 and the mounting groove 12 is greater than or equal to 2mm. As a result, there is sufficient mating area between the side plate portion 211 of the first plastic body 21 and the inner peripheral wall of the mounting groove 12 for torque transmission, which helps to reduce the structural strength requirements of the first plastic part 2. The first plastic part 2 can be made of a lower cost material.

[0078] In some embodiments, the depth of the mounting groove 12 in the axial direction of the pole column 5 is greater than half the height of the first plastic body 21 in the axial direction of the pole column 5, in other words, the fitting depth of the first plastic body 21 and the mounting groove 12 is greater than half the height of the first plastic body 21 in the axial direction of the pole column 5. In this way, the fitting depth of the first plastic body 21 and the light-aluminum sheet 1 can be ensured, so that the torsion transmitted to the first plastic part 2 can be effectively dispersed to the light-aluminum sheet 1, thereby improving the stability of the assembly and the limiting of the two, achieving effective limiting of the light-aluminum sheet 1 to the first plastic body 21, reducing the local stress of the first plastic part 2, and facilitating the reduction of the strength requirement of the first plastic part 2.

[0079] In some embodiments, the depth of the mounting groove 12 in the axial direction of the pole column 5 is greater than half the height of the first plastic body 21 in the axial direction of the pole column 5, in other words, the fitting depth of the first plastic body 21 and the mounting groove 12 is greater than half the height of the first plastic body 21 in the axial direction of the pole column 5. In this way, the fitting depth of the first plastic body 21 and the light-aluminum sheet 1 can be ensured, so that the torsion transmitted to the first plastic part 2 can be effectively dispersed to the light-aluminum sheet 1, thereby improving the stability of the assembly and the limiting of the two, achieving effective limiting of the light-aluminum sheet 1 to the first plastic body 21, reducing the local stress of the first plastic part 2, and facilitating the reduction of the strength requirement of the first plastic part 2.

[0080] In this way, the fitting depth of the first plastic body 21 and the light-aluminum sheet 1 can be ensured, so that the torsion transmitted to the first plastic part 2 can be effectively dispersed to the light-aluminum sheet 1, thereby improving the stability of the assembly and the limiting of the two, achieving effective limiting of the light-aluminum sheet 1 to the first plastic body 21, reducing the local stress of the first plastic part 2, and facilitating the reduction of the strength requirement of the first plastic part 2.

[0081] In some embodiments, the depth of the mounting groove 12 in the axial direction of the pole column 5 is greater than half the height of the first plastic body 21 in the axial direction of the pole column 5, in other words, the fitting depth of the first plastic body 21 and the mounting groove 12 is greater than half the height of the first plastic body 21 in the axial direction of the pole column 5. In this way, the fitting depth of the first plastic body 21 and the light-aluminum sheet 1 can be ensured, so that the torsion transmitted to the first plastic part 2 can be effectively dispersed to the light-aluminum sheet 1, thereby improving the stability of the assembly and the limiting of the two, achieving effective limiting of the light-aluminum sheet 1 to the first plastic body 21, reducing the local stress of the first plastic part 2, and facilitating the reduction of the strength requirement of the first plastic part 2.

[0082] In some embodiments, in the axial direction of the pole column 5, the height of the part of the pole column block 4 located in the mounting groove 12 is greater than or equal to half the depth of the mounting groove 12. It can be understood that the first plastic body 21 is installed in the mounting groove 12, and the pole column block 4 is installed in the accommodating groove 23 formed by the first plastic body 21, that is, at least part of the pole column block 4 is located in the mounting groove 12.

[0083] Therefore, the height of the pole post pressing block 4 located in the installation groove 12 is greater than or equal to half of the depth of the installation groove 12, so that the height of the pole post pressing block 4 and the inner wall of the installation groove 12 in the radial direction of the pole post 5 is greater, in other words, the torsion of the pole post 5 supported on the pole post pressing block 4 can be directly transmitted to the inner wall of the installation groove 12 in the radial direction of the pole post 5 through the side plate part 211, that is, the inner wall of the installation groove 12 can support and limit most of the pole post pressing block 4 in the radial direction of the pole post 5, thereby facilitating the dispersion of the torsion, reducing the local stress of the first plastic part 2 and the pole post pressing block 4, and reducing the requirement for the structural strength of the pole post pressing block 4.

[0084] In some embodiments, the first plastic part 2 is made of polypropylene material (PP), and it should be noted that the material cost of the polypropylene material (PP) used to make the first plastic part 2 is lower than that of the polyphenylene sulfide (PPS), and in particular, the raw material cost of the polyphenylene sulfide (PPS) is close to 3 times the raw material cost of the polypropylene material (PP). Therefore, using the polypropylene material (PP) to make the first plastic part 2 can reduce the installation cost of the first plastic part 2.

[0085] In some embodiments, the top cover assembly 100 further comprises a second plastic part 3 located on the side of the light aluminum sheet 1 away from the first plastic part 2, and the second plastic part 3 is provided with a third pole post hole 31 for penetrating the pole post 5. Therefore, during installation of the top cover assembly 100, the pole post 5 penetrates the second pole post hole 24 of the first plastic part 2, the first pole post hole 15 of the light aluminum sheet 1, and the third pole post hole 31 of the second plastic part 3. Therefore, one end of the pole post 5 extends to the inside of the light aluminum sheet 1 and the other end extends to the outside of the light aluminum sheet 1. One end of the pole post 5 is connected to the current collector plate 6 on the inside of the light aluminum sheet 1, and then connected to the battery cell through the current collector plate 6. The other end of the pole post 5 on the outside of the light aluminum sheet 1 can be connected to the external electrical connection structure. In this way, the pole post 5 can conduct current between the inside and outside of the top cover assembly 100.

[0086] The first plastic part 2 located on the outside of the light aluminum sheet 1 can insulate and separate the pole post 5 from the outer side surface 13 of the light aluminum sheet 1, and at the same time, the second plastic part 3 located on the inside of the light aluminum sheet 1 can insulate and separate the pole post 5 from the outer side surface 13 of the light aluminum sheet 1.

[0087] And / or, a sealing member 7 is arranged between the inner wall of the first pole post hole 15 and the outer peripheral wall of the pole post 5, which can be configured as an insulating sealing ring. The sealing member 7 is sleeved on the outside of the pole post 5. The sealing member 7 not only plays a role in insulating between the pole post 5 and the light aluminum sheet 1 to avoid safety hazards caused by electrification of the top cover assembly 100 and improve the safety of the top cover assembly 100, but also plays a role in sealing between the inside and outside of the light aluminum sheet 1.

[0088] In some embodiments, the pole post pressing block 4 is provided with a pressing block through hole 41, the upper end of the pole post 5 is inserted into the pressing block through hole 41, and a limiting step 42 is formed in the pressing block through hole 41. A limiting boss 51 is formed on the outer peripheral wall of the upper end of the pole post 5. The limiting boss 51 abuts against the step surface of the limiting step 42, that is, the limiting boss 51 and the limiting step 42 limit and abut against each other along the axial direction of the pole post 5, so as to press the pole post pressing block 4 toward the first plastic part 2, thereby realizing the structural installation and fixation.

[0089] The energy storage system Z, energy storage device Y, battery cell 200 and top cover assembly 100 of any of the above embodiments have the same advantages over the prior art, and will not be repeated here.

[0090] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0091] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cap assembly, characterized by, The application relates to a plastic-aluminum composite terminal, which comprises the following parts: an aluminum sheet (1) provided with a first pole post hole (15), an outer side (13) of the aluminum sheet (1) forming a limiting ring table (11), and a mounting groove (12) formed in the limiting ring table (11) and arranged around the first pole post hole (15); a first plastic part (2) mounted on the outer side (13) of the aluminum sheet (1), the first plastic part (2) comprising a first plastic main body (21) mounted on the mounting groove (12), the first plastic main body (21) being provided with a second pole post hole (24) for penetrating a pole post (5), and a containing groove (23) formed in the first plastic main body (21) and arranged around the second pole post hole (24), and a pole post pressing block (4) mounted in the containing groove (23) and limitingly matched with the pole post (5); wherein the outer side (13) of the aluminum sheet (1) is higher than an inner bottom wall of the mounting groove (12).

2. The roof assembly of claim 1, wherein, The first plastic main body (21) comprises a side plate part (211) and a bottom plate part (212) connected through bending, and the bottom plate part (212) is located between the inner bottom wall of the mounting groove (12) and the pole post pressing block (4). The limiting ring table (11) has an inner ring surface (111) for limiting the mounting groove (12), the side plate part (211) is located between the inner ring surface (111) and the pole post pressing block (4), and the side plate part (211) is arranged around the pole post pressing block (4).

3. The roof assembly of claim 2, wherein, The first plastic part (2) further comprises a limiting flange (22) connected to an outer peripheral wall of one end of the side plate part (211) away from the bottom plate part (212). The limiting ring table (11) is formed with a ring table end surface (112) at one end away from the aluminum sheet (1), and the limiting flange (22) is limitedly pressed against the ring table end surface (112).

4. The roof assembly of claim 2, wherein, In the axial projection of the pole post (5), the containing groove (23) is located in the mounting groove (12).

5. The roof assembly of any one of claims 1-4, wherein, In the axial direction of the pole post (5), the depth of the mounting groove (12) is D, and D is greater than or equal to 2 mm.

6. The roof assembly of any one of claims 1-4, wherein, The depth of the mounting groove (12) in the axial direction of the pole post (5) is greater than half of the height of the first plastic main body (21) in the axial direction of the pole post (5). The depth of the containing groove (23) in the axial direction of the pole post (5) is greater than half of the height of the pole post pressing block (4) in the axial direction of the pole post (5). The depth of the mounting groove (12) in the axial direction of the pole post (5) is greater than the height of the limiting ring table (11) in the axial direction of the pole post (5).

7. The roof assembly of any one of claims 1-4, wherein, In the axial direction of the pole post (5), the height of the part of the pole post pressing block (4) located in the mounting groove (12) is greater than or equal to half of the depth of the mounting groove (12).

8. The roof assembly of any one of claims 1-4, wherein, The first plastic part (2) is made of polypropylene material.

9. The roof assembly of any one of claims 1-4, wherein, Further comprising a second plastic part (3) located on the inner side of the light aluminum sheet (1) away from the first plastic part (2), the second plastic part (3) is provided with a third pole hole (31) for penetrating the pole (5); And / or, a sealing element (7) is arranged between the inner wall of the first pole hole (15) and the outer peripheral wall of the pole (5).

10. A battery cell characterized by, The top cover assembly of any one of claims 1-9.

11. An energy storage device, characterized by, The battery cell of claim 10.

12. An energy storage system characterized by, The energy storage device of claim 11.

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