Lower insulating piece, end cover assembly, energy storage device and electric appliance

Abstract

The application provides a lower insulating piece, an end cover assembly, an energy storage device and an electric equipment, which guarantees good structural stability of the energy storage device and improves safety performance of the energy storage device. The lower insulating piece has a first surface and a second surface, which are oppositely arranged along the thickness direction of the lower insulating piece; the lower insulating piece is provided with a first air hole, and the first air hole penetrates through the first surface and the second surface; the lower insulating piece is provided with a first boss and a partition part, and the first boss and the partition part are arranged on the second surface; the first boss is arranged adjacent to the first air hole and is used for pressing the cell assembly of the energy storage device; the first boss has a first boss surface, which is the surface of the first boss away from the second surface; the partition part is arranged around the first air hole and is used for partitioning the tab of the cell assembly and the first air hole; the partition part has a third surface away from the second surface, and the third surface is located on the side of the first boss surface close to the second surface.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a lower insulating component, an end cap assembly, an energy storage device, and an electrical device. Background Technology

[0002] With the increasingly widespread application of energy storage devices, their safety performance has become a major concern. During operation, the battery cells in energy storage devices tend to move up and down. Existing end cap assemblies in energy storage devices are not effective at pressing down on the battery cells, which reduces the structural stability and reliability of the energy storage device. Utility Model Content

[0003] This application provides a lower insulating component, an end cap assembly, an energy storage device, and an electrical device to ensure good structural stability of the energy storage device and improve its safety performance.

[0004] This application provides a lower insulating member for use in an energy storage device. The lower insulating member has a first surface and a second surface, and the first surface and the second surface are disposed opposite to each other along the thickness direction of the lower insulating member. The lower insulating component is provided with a first vent hole, which penetrates the first surface and the second surface; The lower insulating member is provided with a first protrusion and a partition. The first protrusion and the partition are both provided on the second surface. The first protrusion is adjacent to the first vent hole. The first protrusion has a first protrusion surface, which is the surface of the first protrusion facing away from the second surface, and it presses against the cell assembly of the energy storage device. The partition portion is arranged around the first vent hole and is used to separate the electrode tab of the battery cell assembly from the first vent hole. The partition portion has a third surface, which is the surface of the partition portion facing away from the second surface and is located on the side of the first boss surface close to the second surface.

[0005] There are two first protrusions, located on opposite sides of the first vent hole along the width direction of the lower insulating member, and the partition is located between the two first protrusions.

[0006] The partition includes a vertical wall, which is disposed on the second surface and surrounds the first vent hole.

[0007] The partition includes multiple columns, which are spaced around the first vent hole.

[0008] The partition further includes a first baffle, which is located on the side of the second surface away from the first surface and is opposite to the first vent. The first baffle includes the third surface and a fourth surface, which are opposite to the third surface. The first baffle is provided with a second vent, which penetrates the third surface and the fourth surface and is opposite to the first vent. The vertical wall surrounds the first baffle and is connected to the first baffle.

[0009] Wherein, along the thickness direction of the lower insulating member, the distance between the fourth surface and the first surface is greater than or equal to 1 mm.

[0010] The partition portion is provided with a third vent hole, which extends through the partition portion along the length of the lower insulating member and communicates with the first vent hole.

[0011] The battery cell assembly includes two cores arranged along the width direction of the lower insulation member. The third vent hole is located between the tabs of the two cores along the width direction of the lower insulation member.

[0012] In the width direction of the lower insulating member, the minimum distance between the third vent hole and the tab is greater than or equal to 2 mm and less than or equal to 9 mm.

[0013] The lower insulating component is further provided with a first liquid injection hole, which penetrates the first surface and the second surface and is spaced apart from the first vent hole. The lower insulating component is further provided with a protective cover, which is disposed on the second surface and covers the first injection hole; the protective cover is provided with a through hole, which penetrates the protective cover along the width direction of the lower insulating component.

[0014] This application also provides an end cap assembly, including the lower insulating member, end cap and explosion-proof valve described above, wherein the end cap is located on the side of the first surface away from the second surface, and the end cap is provided with an explosion-proof hole, which is disposed opposite to the first vent hole; The explosion-proof valve is installed on the end cap and covers the explosion-proof hole.

[0015] Wherein, the projection of the first vent hole on the end cap covers the explosion-proof valve, and the projection of the partition on the end cap is offset from that of the explosion-proof valve.

[0016] This application also provides an energy storage device, which includes a housing, a battery cell assembly, and an end cap assembly as described above. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing and contains an electrolyte. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The battery cell assembly is housed in the receiving cavity. The end cap assembly is mounted on the housing and closes the opening, and is electrically connected to the battery cell assembly. The first boss abuts against the battery cell assembly.

[0017] This application also provides an electrical device, including the energy storage device as described above, the energy storage device being used to supply power to the electrical device.

[0018] This application provides a partition in the lower insulating member, with the third surface of the partition located on the side of the first boss surface closer to the second surface. This prevents the partition from protruding relative to the first boss surface, ensuring that the first boss is always the point of force against the battery cell assembly and that the partition does not press against the battery cell assembly. This ensures the structural stability of the partition, better prevents misaligned tabs from abnormally overlapping with the end cap, improves the structural stability of the end cap assembly, and enhances the safety performance of the energy storage device. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0020] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application; Figure 2 This is a schematic diagram of the energy storage device structure provided in this application; Figure 3 yes Figure 2 The diagram shows the exploded structure of the energy storage device. Figure 4 yes Figure 3 A schematic diagram of the assembly structure of the housing, battery cell assembly and Mylar membrane in the energy storage device shown; Figure 5 yes Figure 3 A schematic diagram of the planar structure of the energy storage device shown after being cut along point AA. Figure 6 yes Figure 3 An exploded view of the end cap assembly in the energy storage device shown. Figure 7 yes Figure 3 The diagram shows a cross-sectional view of the end cap assembly after it has been cut open along point BB. Figure 8 yes Figure 7 An enlarged schematic diagram of region R in the end cap assembly; Figure 9 yes Figure 6 A schematic diagram of the planar structure of the lower insulating member in the end cap assembly shown in the first embodiment; Figure 10 yes Figure 9 The diagram below shows the structure of the insulating component; Figure 11 yes Figure 9 The diagram shows the structure of the lower insulating component from another angle. Figure 12 yes Figure 3 A schematic diagram of the assembly of the end cap assembly and the cell assembly in the energy storage device shown from another angle; Figure 13 yes Figure 6 A schematic diagram of the lower insulating component in the end cap assembly shown in the second embodiment; Figure 14 yes Figure 6 The diagram shows the structure of the lower insulating member in the end cap assembly under the third embodiment.

[0021] Reference numerals: 1. Energy storage system; 2. High-voltage cable; 3. First power conversion device; 4. Second power conversion device; 5. Energy storage device; 1000; 2000; 2000; 3000; 4000; 5000; 2001; 2002; 3100; 3100; 3200; 3200; 100; 200; 300; 400; 500; 600; 700; 800; 700; 800; 101; 102; 103; 120; 110; 121; 122; 111; 112; 113; 114; 114; 170; 180; 1900; 2000; 2000; 2000; 2000; 2000; 3100; 3200; 3200; 100; 20 ... Column hole 180, first injection hole 190, first groove 140, second groove 160, fourth vent hole 10, fifth vent hole 20a, sixth vent hole 20b, seventh vent hole 31, eighth vent hole 35, ninth vent hole 40, first groove bottom wall 141, first groove side wall 142, second groove side wall 143, third groove side wall 144, fifth hole wall 21, sixth hole wall 22, partition 50 , Protective cover 60, reinforcing rib Q, third surface 50a, first baffle 51, vertical wall 55, fourth surface 53, second peripheral side 54, second vent 510, seventh surface 56, eighth surface 57, connecting surface 58, third vent 520, tenth vent 530, second baffle 61, side plate 62, through hole 65, explosion-proof hole 210, second pole hole 220, second injection hole 230, column 55a. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form for future applications. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels. Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak demand periods, and excessive power during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, this energy can be converted back into electrical energy and released. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0024] Taking electrochemical energy storage as an example, this solution provides an energy storage device 1000, which is applied to an energy storage system 1. The energy storage device 1000 is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0025] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices include: (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can help renewable energy power generation meet grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the absorption capacity of renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation. (2) Energy storage containers applied on the grid side mainly function as peak shaving, frequency regulation and relief of grid congestion. In terms of peak shaving, they can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption. (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge during peak loads, thereby reducing peak power and the maximum demand declared, achieving the goal of reducing capacity costs. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0026] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 1 according to an embodiment of this application, and this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 1000 of this application is not limited to its generation / distribution side energy storage scenario.

[0027] This application provides an energy storage system 1, which includes: a high-voltage cable 2, a first power conversion device 3, a second power conversion device 4, and an energy storage device 1000 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 4 can be a wind power conversion device. Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device 1000 through grid connection. The energy storage device 1000 is connected to the high-voltage cable 2 and outputs smooth electricity to supply the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, the wind power conversion device... Always connected to high-voltage cable 2, under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in energy storage device 1000 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in energy storage device 1000 together with high-voltage cable 2 in grid-connected mode to supply power to the power consumption side, providing multiple services such as peak shaving, frequency regulation, and backup for power grid operation, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling of the power grid, and alleviating the power supply pressure of the power grid.

[0028] In some embodiments on the distribution network side, the first power conversion device 3 can be a photovoltaic power conversion device. The energy storage device 1000 is connected to the high-voltage cable 2 and installed downstream of the high-voltage cable 2 between the user load and the user load. The power output by the photovoltaic power conversion device is stored in the energy storage device 1000, which can respond in a timely manner to act as a backup power source when the power grid / distribution network fails. Alternatively, it can provide power supply support to alleviate line congestion when the high-voltage cable 2 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0029] Optionally, the first power conversion device may include, but is not limited to, a wind power conversion device, and the second power conversion device may include, but is not limited to, a photovoltaic power conversion device. The first power conversion device 3 and the second power conversion device 4 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0030] Optionally, the energy storage device 1000 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0031] Please see Figures 2 to 5 , Figure 2This is a schematic diagram of the energy storage device 1000 provided in this application. Figure 3 yes Figure 2 The exploded structural diagram of the energy storage device 1000 shown is as follows. Figure 4 yes Figure 3 The diagram shows the assembly structure of the energy storage device 1000, comprising the housing 2000, the battery cell assembly 3000, and the Mylar membrane 5000. Figure 5 yes Figure 3 A schematic diagram of the planar structure of the energy storage device 1000 after being cut along point AA.

[0032] This application provides an energy storage device 1000, which may include, but is not limited to, single-cell batteries, battery modules, battery packs, and battery systems. The actual application of the energy storage device provided in this application may be, but is not limited to, the products listed, or other application forms. This application does not strictly limit the application form of the energy storage device 1000. This application uses a square battery as an example for illustration.

[0033] The energy storage device 1000 includes a housing 2000, a cell assembly 3000, an end cap assembly 4000, and a Mylar membrane 5000. The housing 2000 has a receiving cavity 2001 and an opening 2002. The receiving cavity 2001 is located inside the housing 2000 and contains electrolyte. The opening 2002 is located on the top side of the receiving cavity 2001 and communicates with it. The housing 2000 may be made of aluminum; for example, the housing 2000 may be an aluminum shell. The cell assembly 3000 is housed in the receiving cavity 2001. The cell assembly 3000 can be immersed in the electrolyte. The cell assembly 3000 includes two cores 3100. The two cores 3100 are arranged along the width direction of the lower insulator 100 and form two corner areas T. Along the length direction of the energy storage device 1000, the two corner areas T are located at both ends of the cell assembly 3000. Each core 3100 includes two tabs 3200. The two tabs 3200 are spaced apart and arranged along the length of the energy storage device 1000. One tab 3200 is a positive tab, and the other tab 3200 is a negative tab. Along the width of the energy storage device 1000, the positive tabs of the two cores 3100 are arranged opposite each other, and the negative tabs of the two cores 3100 are arranged opposite each other. The end cap assembly 4000 is mounted on the housing 2000, closes the opening 2002, and is electrically connected to the cell assembly 3000. The Mylar membrane 5000 is housed in the receiving cavity 2001, located between the housing 2000 and the cell assembly 3000, and wraps around the cell assembly 3000. It is also connected to the end cap assembly 4000. The Mylar membrane 5000 can be connected to the end cap assembly 4000 by heat fusion to isolate the housing 2000 and the cell assembly 3000.

[0034] Please see Figures 6 to 8 , Figure 6 yes Figure 3 The diagram shows an exploded view of the end cap assembly 4000 in the energy storage device 1000. Figure 7 yes Figure 3 The diagram shows a cross-sectional view of the end cap assembly 4000 after it has been cut along point BB. Figure 8 yes Figure 7 An enlarged schematic diagram of region R in the end cap assembly 4000.

[0035] In this embodiment, the end cap assembly 4000 includes a lower insulating member 100, an end cap 200, an explosion-proof valve 300, a protective plate 400, a pole 500, a connecting piece 600, an upper insulating member 700, and a sealing ring 800. The lower insulating member 100 is thermally fused to the Mylar membrane 5000. Along the thickness direction of the end cap assembly 4000, the end cap 200 is mounted on one side of the lower insulating member 100. The explosion-proof valve 300 and the protective plate 400 are both mounted on the end cap 200. The pole 500 passes through the end cap 200 and the lower insulating member 100. There are two poles 500, arranged at intervals along the length direction of the end cap assembly 4000. One pole 500 serves as the positive pole, and the other pole 500 serves as the negative pole. A connecting piece 600 is located on the side of the lower insulator 100 opposite to the end cap 200 and on the side of the terminal 500, connected to the terminal 500 and electrically connected to the tab 3200 of the cell assembly 3000. There are two connecting pieces 600. The two connecting pieces 600 are spaced apart along the length of the end cap assembly 4000. One connecting piece 600 serves as a positive connecting piece, connected to the positive terminal and electrically connected to the positive tabs of both cell assemblies 3000. The other connecting piece 600 serves as a negative connecting piece, connected to the negative terminal and electrically connected to the negative tabs of both cell assemblies 3000. An upper insulator 700 is installed between the terminal 500 and the end cap 200. There are two upper insulators 700, each installed between one terminal 500 and the end cap 200. One upper insulating component 700 serves as the positive electrode insulating component and is installed between the positive electrode post and the end cap 200. Another upper insulating component 700 serves as the negative electrode insulating component and is installed between the negative electrode post and the end cap 200. A sealing ring 800 is fitted onto the upper insulating component 700 and clamped between the end cap 200 and the electrode post 500. There are two sealing rings 800; each sealing ring 800 is fitted onto one upper insulating component 700 and clamped between the end cap 200 and one electrode post 500. One sealing ring 800 serves as the positive electrode sealing ring, fitted onto the positive electrode insulating component and clamped between the end cap 200 and the positive electrode post. The other sealing ring 800 serves as the negative electrode sealing ring, fitted onto the negative electrode insulating component and clamped between the end cap 200 and the negative electrode post.

[0036] Please see Figure 9 and Figure 10 , Figure 9 yes Figure 6 The diagram shows a planar structural schematic of the lower insulating member 100 in the end cap assembly 4000 according to the first embodiment. Figure 10 yes Figure 9 The diagram shows the structure of the lower insulating component 100.

[0037] The lower insulating member 100 includes a first surface 101, a second surface 102, and two first peripheral side surfaces 103. Along the thickness direction of the lower insulating member 100, the second surface 102 and the first surface 101 are disposed opposite to each other. Along the width direction of the lower insulating member 100, the two first peripheral side surfaces 103 are disposed opposite to each other and connected between the first surface 101 and the second surface 102.

[0038] The lower insulating member 100 is provided with a first boss 120 and a second boss 110. Both the first boss 120 and the second boss 110 are located on the second surface 102 and protrude from the second surface 102 in a direction away from the first surface 101. Along the length of the lower insulating member 100, the first boss 120 is located at the middle of the lower insulating member 100. The first boss 120 has a first boss surface 121 and a first boss side surface 122. The first boss surface 121 is the side of the first boss 120 facing away from the second surface 102 and is used to press against the battery cell assembly 3000. For example, the distance between the first boss surface 121 and the second surface 102 is 5.5 mm, that is, the height of the first boss 120 is 5.5 mm. The first boss side surface 122 is disposed around the first boss surface 121 and connects between the first boss surface 121 and the second surface 102. For example, the first boss 120 is square. There are two first protrusions 120, which are spaced apart. Along the width direction of the lower insulating member 100, the two first protrusions 120 are located at opposite ends of the lower insulating member 100.

[0039] Along the length of the lower insulating member 100, the second boss 110 is located on one side of the first boss 120 and is spaced apart from the first boss 120. The second boss 110 includes a second boss surface 111 and a second boss side surface 112. The second boss surface 111 is the side of the second boss 110 facing away from the second surface 102 and abuts against the battery cell assembly 3000. For example, the distance between the second boss surface 111 and the second surface 102 is 5.5 mm, that is, the height of the second boss 110 is 5.5 mm. The second boss side surface 112 is disposed around the second boss surface 111 and connects the second boss surface 111 and the second surface 102. The second boss side surface 112 includes a first side surface 113 and a second side surface 114. Along the length of the lower insulating member 100, the second side surface 114 is disposed opposite to the first side surface 113. For example, the second protrusion 110 is elongated, and its length direction is parallel to the width direction of the lower insulating member 100. In this embodiment, there are two second protrusions 110, which are spaced apart. Along the length direction of the lower insulating member 100, the two second protrusions 110 are located at opposite ends of the lower insulating member 100.

[0040] In this embodiment, the first protrusion 120 and the second protrusion 110 press against the cell assembly 3000, which can fix the cell assembly 3000 and prevent the tabs 3200 from tearing or the core 3100 from loosening due to the shaking of the cell assembly 3000. This reduces the impact of the cell assembly 3000 moving along the thickness direction of the lower insulation member 100 inside the energy storage device 1000, improves the stability of the internal structure of the energy storage device 1000, and enhances the safety performance and reliability of the energy storage device 1000.

[0041] The lower insulating member 100 has a heat-fusion zone H. The heat-fusion zone H is located on the second side surface 114. Along the width direction of the lower insulating member 100, the heat-fusion zone H is located at the middle of the second side surface 114. The lower insulating member 100 can be heat-fused to the Mylar film 5000 in the heat-fusion zone H.

[0042] Please refer to the following: Figure 11 , Figure 11 yes Figure 9 The diagram shows the structure of the lower insulating member 100 at another angle.

[0043] The lower insulating member 100 is also provided with a first vent hole 170, a first pole hole 180, a first liquid injection hole 190, a first groove 140, a second groove 160, a fourth vent hole 10, a fifth vent hole 20a, a sixth vent hole 20b, a seventh vent hole 31, an eighth vent hole 35, and a ninth vent hole 40. The first vent hole 170, the first pole hole 180, and the first liquid injection hole 190 all penetrate the lower insulating member 100 along its thickness direction. Along the width direction of the lower insulating member 100, the first vent hole 170 is located between two first protrusions 120 and is adjacent to the first protrusions 120. Along the length of the lower insulating member 100, a first vent hole 170 is located between two first protrusions 120, and is spaced apart from both first protrusions 120, and is located on the side of the first side surface 113 away from the second side surface 114. The first vent hole 170 penetrates the first surface 101 and the second surface 102. The first side surface 113 is oriented towards the first vent hole 170.

[0044] The first electrode post hole 180 is located between the first vent hole 170 and the second boss 110. There are two first electrode post holes 180. One first electrode post hole 180 is located between the first vent hole 170 and the second boss 110. The other first electrode post hole 180 is located between the first vent hole 170 and the other second boss 110. The first injection hole 190 is located between one first electrode post hole 180 and the first vent hole 170, and is spaced apart from both the first electrode post hole 180 and the first vent hole 170.

[0045] Along the length of the lower insulating member 100, the first groove 140 is located at the end of the lower insulating member 100 and is correspondingly disposed with respect to the second boss 110. It should be noted that the correspondence between the first groove 140 and the second boss 110 means that the projection of the first groove 140 onto the second boss 110 partially covers the second boss 110. Specifically, the opening of the first groove 140 is located on the first surface 101. The first groove 140 is recessed from the first surface 101 toward the second boss 110 and is spaced apart from the first peripheral side surface 103. The first groove 140 includes a first groove bottom wall surface 141, a first groove side wall surface 142, a second groove side wall surface 143, and two third groove side wall surfaces 144. The first groove bottom wall surface 141 is opposite to the opening of the first groove 140 and is located between the second boss surface 111 and the second surface 102. The first groove side wall surface 142 and the second groove side wall surface 143 are both connected between the first groove bottom wall surface 141 and the first surface 101. The first groove sidewall 142 is the surface of the first groove 140 near the first vent hole 170, and is disposed opposite to the first side surface 113. Along the length of the lower insulating member 100, the second groove sidewall 143 is disposed opposite to the first groove sidewall 142, and is located on the side of the first groove sidewall 142 away from the first boss 120, and is disposed opposite to the second side surface 114. Two third groove sidewalls 144 are connected between the first groove sidewall 142 and the second groove sidewall 143. There are two first grooves 140, which are spaced apart. Along the length of the lower insulating member 100, the two first grooves 140 are respectively located on opposite sides of the first boss 120, and are respectively disposed corresponding to the two second bosses 110. For example, the first groove 140 is elongated, and the length direction of the first groove 140 is parallel to the width direction of the lower insulating member 100.

[0046] Along the length of the lower insulating member 100, the second groove 160 is located between the two first grooves 140, spaced apart from the first grooves 140, and corresponding to the first boss 120. It should be noted that the second groove 160 corresponding to the first boss 120 means that the projection of the second groove 160 onto the first boss 120 partially covers the first boss 120. Along the width of the lower insulating member 100, the second groove 160 is located at both ends of the lower insulating member 100. The opening of the second groove 160 is located on the first surface 101. The second groove 160 is recessed from the first surface 101 towards the second surface 102. The second groove 160 includes a second groove bottom wall surface 161. The second groove bottom wall surface 161 is opposite to the opening of the second groove 160 and is located between the first boss surface 121 and the first surface 101.

[0047] Please continue reading. Figures 9 to 11The fourth vent 10, the fifth vent 20a, the sixth vent 20b, the seventh vent 31, and the eighth vent 35 are all provided on the second boss 110. The fourth vent 10 is provided on the groove sidewall of each first groove 140 facing the first vent 170, and penetrates the groove sidewall along the thickness direction of the groove sidewall of the first groove 140. Specifically, the fourth vent 10 penetrates the first sidewall 113 and the first groove sidewall 142, communicates with the first groove 140, and is also spaced apart from the first peripheral sidewall 103. In this embodiment, the fourth vent 10 also penetrates the second boss surface 111 and the first groove bottom wall surface 141 to increase the exhaust channel and improve the exhaust speed of the lower insulating member 100. The fourth vent 10 has a third hole wall surface 11 and a fourth hole wall surface 12. Along the width direction of the lower insulating member 100, the third hole wall surface 11 and the fourth hole wall surface 12 are arranged opposite to each other, and are both spaced apart from the first peripheral sidewall 103. For example, the fourth vent 10 is a rectangular hole. It should be noted that since the first side 113 is not thermally fused to the Mylar membrane 5000, the distance between the third hole wall 11 and the fourth hole wall 12 of the fourth vent 10 can be large enough and smaller than the length of the second protrusion 110, so as to ensure that the fourth vent 10 has a large cross-sectional area for airflow to pass through, which is beneficial for timely guiding the gas to the explosion-proof valve 300.

[0048] The fifth vent 20a and the sixth vent 20b are provided on the groove sidewall of each first groove 140 away from the first vent 170, and penetrate the groove sidewall along the thickness direction of the groove sidewall of the first groove 140. Specifically, the fifth vent 20a and the sixth vent 20b both penetrate the second groove sidewall surface 143 and the second side surface 114, and are spaced apart along the width direction of the lower insulating member 100, and are respectively located on opposite sides of the heat-melting zone H. The fifth vent 20a and the sixth vent 20b are both connected to the first groove 140, and are spaced apart from the heat-melting zone H, and are used for heat-melting connection with the Mylar membrane 5000. It should be noted that the fifth vent 20a and the sixth vent 20b are both spaced apart from the heat-fusion zone H. This avoids the fifth vent 20a and the sixth vent 20b affecting the heat-fusion connection between the heat-fusion zone H of the lower insulating component 100 and the Mylar membrane 5000, thereby improving the assembly stability of the energy storage device 1000. Furthermore, the fifth vent 20a and the sixth vent 20b both penetrate the bottom wall surface 141 of the first groove and the surface 111 of the second boss to increase the exhaust channel and improve the exhaust speed of the lower insulating component 100.

[0049] The fifth vent 20a has a fifth hole wall 21 that is away from the sixth vent 20b. The projection of the fifth hole wall 21 onto the first side surface 113 overlaps with the third hole wall 11, or the fifth hole wall 21 is located on the side of the third hole wall 11 facing the fourth hole wall 12. The sixth vent 20b has a sixth hole wall 22 that is away from the fifth vent 20a. Along the width direction of the lower insulating member 100, the sixth hole wall 22 and the fifth hole wall 21 are arranged opposite each other and face the same direction as the fourth hole wall 12. The projection of the sixth hole wall 22 onto the first side surface 113 overlaps with the fourth hole wall 12, or the sixth hole wall 22 is located on the side of the fourth hole wall 12 facing the third hole wall 11. This configuration ensures that gas on both sides of the battery cell assembly 3000 can smoothly pass through the fourth vent 10 via the fifth vent 20a and the sixth vent 20b, and then reach the position of the first vent 170, guaranteeing the effectiveness of venting of the lower insulation component 100 and improving the venting performance and safety performance of the energy storage device 1000. For example, the fifth vent 20a and the sixth vent 20b are rectangular holes. Along the width direction of the lower insulation component 100, the length of both the fifth vent 20a and the sixth vent 20b is 15.5 mm, and along the length direction of the lower insulation component 100, the depth of both the fifth vent 20a and the sixth vent 20b is 3 mm.

[0050] Please refer to the following: Figure 12 , Figure 12 yes Figure 3 This is a schematic diagram of the assembly of the end cap assembly 4000 and the cell assembly 3000 in the energy storage device 1000 from another angle.

[0051] Both the seventh vent 31 and the eighth vent 35 are located on the bottom wall of each first groove 140 and penetrate the bottom wall of the first groove 140 along the thickness direction of the lower insulating member 100. Specifically, both the seventh vent 31 and the eighth vent 35 penetrate the bottom wall surface 141 of the first groove and the surface 111 of the second boss, and are connected to the first groove 140. The seventh vent 31 is positioned opposite to the corner area T. It should be noted that, due to the heat-fusion connection between the Mylar membrane 5000 and the second side surface 114 of the lower insulating member 100, the Mylar membrane 5000 adheres to the second side surface 114, blocking the airflow from the side of the battery cell assembly 3000 into the fifth vent 20a and the sixth vent 20b, thus limiting the exhaust effect of the lower insulating member 100. The seventh vent 31 eliminates the problem that gas cannot be exhausted through the fifth vent 20a and the sixth vent 20b after the Mylar membrane 5000 is thermally fused with the second side 114. This ensures that the airflow from both sides of the cell assembly 3000 can quickly enter the seventh vent 31, and then flow through the fourth vent 10 to the first vent 170, improving the exhaust speed of the lower insulation component 100. This ensures good exhaust performance of the energy storage device 1000 and improves its safety performance. For example, the seventh vent 31 is a rectangular hole.

[0052] The eighth vent 35 is located on one side of the seventh vent 31. There are multiple eighth vents 35. Along the length of the second boss 110, multiple eighth vents 35 are located on opposite sides of the seventh vent 31, and are spaced apart from each other. The arrangement of the eighth vents 35 increases the exhaust channel of the lower insulating member 100, allowing gas inside the energy storage device 1000 to enter the first groove 140 through the eighth vents 35, and then reach the explosion-proof valve 300 through the fourth vent 10, ensuring good exhaust performance of the energy storage device 1000 and improving its safety performance.

[0053] In this embodiment, by providing a fourth vent 10, a fifth vent 20a, a sixth vent 20b, a seventh vent 31, and an eighth vent 35, in the event of thermal runaway of the energy storage device 1000, the gas generated inside can quickly enter the first groove 140 through the fifth vent 20a, the sixth vent 20b, the seventh vent 31, or the eighth vent 35, and then flow through the fourth vent 10 to the area below the explosion-proof valve 300. This facilitates the timely opening and pressure relief of the explosion-proof valve 300, ensuring good venting performance of the energy storage device 1000 and improving its safety performance. Furthermore, the seventh vent 31 and the eighth vent 35 can also serve to guide the electrolyte flow. Specifically, during the manufacturing and transportation of the energy storage device 1000, the electrolyte in the containment cavity 2001 will enter the lower insulating component 100. The electrolyte located in the lower insulating component 100 can be returned to the containment cavity 2001 through the seventh vent 31 and the eighth vent 35, ensuring that the electrolyte plays its role in the containment cavity 2001.

[0054] Please continue reading. Figure 10 A ninth vent 40 is provided on each of the first protrusions 120 and penetrates the first protrusion 120 along the thickness direction of the lower insulating member 100. Specifically, the ninth vent 40 penetrates the bottom wall surface 161 of the second groove and the surface 121 of the first protrusion, and communicates with the second groove 160. The provision of the ninth vent 40 increases the exhaust channel of the lower insulating member 100, allowing the gas inside the energy storage device 1000 to directly enter the second groove 160 through the ninth vent 40, and then enter the gap between the lower insulating member 100 and the end cap 200, thereby reaching the explosion-proof valve 300, ensuring good exhaust performance of the energy storage device 1000 and improving the safety performance of the energy storage device 1000.

[0055] Please continue reading. Figures 8 to 10The lower insulating member 100 also includes a partition 50, a protective cover 60, and a reinforcing rib Q. Both the partition 50 and the protective cover 60 are located on the second surface 102. The partition 50 surrounds the first vent 170 and is situated between the two first protrusions 120. It serves to block the tab 3200 of the cell assembly 3000 from the first vent 170, preventing misaligned tabs 3200 from abnormally overlapping with the end cap 200 and improving the safety performance of the energy storage device 1000. The partition 50 has a third surface 50a. The third surface 50a is the surface of the partition 50 facing the cell assembly 3000. The third surface 50a is located on the side of the first boss surface 121 that is close to the second surface 102. That is, the distance between the third surface 50a and the second surface 102 is less than the distance between the first boss surface 121 and the second surface 102, so that the partition portion 50 will not protrude relative to the first boss surface 121, ensuring that the second boss 110 is always the force point that presses against the cell assembly 3000, and ensuring that the partition portion 50 does not press against the cell assembly 3000, thereby ensuring the structural stability of the partition portion 50, and ensuring that the partition portion 50 blocks the misaligned tab 3200 from abnormally overlapping with the end cap 200, thus improving the safety performance of the energy storage device 1000.

[0056] The partition 50 includes a vertical wall 55 and a first baffle 51. The vertical wall 55 is disposed on the second surface 102, surrounds the first vent 170, and is connected to the second surface 102, and is also connected between the two first protrusions 120. The vertical wall 55 has a seventh surface 56, an eighth surface 57, and a connecting surface 58. The seventh surface 56 is the surface of the vertical wall 55 facing away from the first vent 170. Along the thickness direction of the vertical wall 55, the eighth surface 57 is disposed opposite to the seventh surface 56, and the eighth surface 57 faces the first vent 170. The connecting surface 58 connects the seventh surface 56 and the eighth surface 57, and is positioned facing the cell assembly 3000. It is located on the side of the first boss surface 121 closest to the second surface 102. Specifically, the distance between the connecting surface 58 and the second surface 102 is less than the distance between the first boss surface 121 and the second surface 102. This ensures that the vertical wall 55 does not protrude relative to the first boss 120, guaranteeing that the first boss 120 is always the point of force pressing against the cell assembly 3000 and that the vertical wall 55 does not press against the cell assembly 3000, thereby ensuring the structural stability of the partition portion 50. For example, the vertical wall 55 is a curved panel.

[0057] The first baffle 51 is located on the side of the second surface 102 opposite to the first surface 101, and on the side of the vertical wall 55 opposite to the second surface 102, and is connected to the vertical wall 55. It is also positioned opposite to the first vent 170. The first baffle 51 can block the misaligned tab 3200, preventing the tab 3200 from overlapping the end cap 200 near the explosion-proof valve 300 after misalignment, thus affecting the performance of the energy storage device 1000.

[0058] The first baffle 51 has a third surface 50a, a fourth surface 53, and a second peripheral side 54. The third surface 50a is the surface of the first baffle 51 facing the cell assembly 3000, and is located on the side of the first boss surface 121 near the second surface 102, so that the first baffle 51 does not protrude relative to the first boss 120, ensuring that the first boss 120 is always the force point pressing against the cell assembly 3000, and ensuring that the first baffle 51 does not press against the cell assembly 3000, thereby ensuring the structural stability of the partition portion 50. Along the thickness direction of the first baffle 51, the fourth surface 53 and the third surface 50a are arranged opposite to each other and opposite to the second surface 102. The distance between the fourth surface 53 and the first surface 101 is greater than or equal to 1 mm. The second peripheral side 54 connects the third surface 50a and the fourth surface 53.

[0059] The first baffle 51 is provided with a second vent 510. The second vent 510 penetrates the third surface 50a and the fourth surface 53, and is arranged opposite to and communicates with the first vent 170, so that airflow can enter the first vent through the second vent 510 and then reach the explosion-proof valve 300, which facilitates the exhaust of the energy storage device 1000.

[0060] The partition portion 50 is provided with a third vent 520 and a tenth vent 530. The third vent 520 penetrates the partition portion 50 along the length of the lower insulating member 100 and communicates with both the first vent 170 and the second vent 510. In this embodiment, the third vent 520 penetrates the second peripheral side 54 and the hole wall of the second vent 510. In some other embodiments, the third vent 520 may not penetrate the second peripheral side 54, or it may not penetrate the hole wall of the second vent 510; this application does not impose any limitations on this.

[0061] Along the width direction of the lower insulating member 100, the third vent 520 is located between the tabs 3200 of the two cores 3100. This ensures that the side of the third vent 520 facing the tab 3200 (excluding the first boss 120) is not perforated. This improves the venting performance of the lower insulating member 100 while preventing misaligned tabs 3200 from passing through the first vent 170 and abnormally overlapping with the end cap 200, thereby improving the safety performance of the energy storage device 1000. Furthermore, in the width direction of the lower insulating member 100, the minimum distance between the third vent 520 and the tab 3200 is greater than or equal to 2 mm and less than or equal to 9 mm. This arrangement ensures that the third vent 520 has a certain cross-sectional area, guaranteeing good venting performance of the lower insulating member 100. At the same time, it considers the safety margin for the assembly of the tab 3200 and the end cap assembly 4000, ensuring that misaligned tabs 3200 will not abnormally overlap with the end cap 200.

[0062] In this embodiment, there are two third vent holes 520. Along the length of the lower insulating member 100, the two third vent holes 520 are located on opposite sides of the second vent hole 510 and are both connected to the second vent hole 510 to increase the exhaust area of ​​the lower insulating member 100, thereby increasing the exhaust speed of the lower insulating member 100 and improving the exhaust performance and safety performance of the energy storage device 1000.

[0063] The tenth vent 530 is located on one side of the second vent 510 and is spaced apart from the third vent 520, situated between the two first protrusions 120. Along the width of the lower insulating member 100, the tenth vent 530 is located on one side of the second vent 510 and communicates with it, thereby increasing the exhaust channel of the lower insulating member 100 and improving its exhaust performance. There are two tenth vents 530. Along the width of the lower insulating member 100, both tenth vents 530 are located between the two first protrusions 120, respectively on both sides of the second vent 510, and both communicate with the second vent 510 and the first vent 170.

[0064] A protective cover 60 is installed over the first injection hole 190. It should be noted that during electrolyte injection, the protective cover 60 can prevent electrolyte from directly entering the first vent hole 170 from the first injection hole 190 and eroding the explosion-proof valve 300, thus affecting the structural stability of the end cap assembly 4000. The protective cover 60 includes a second baffle 61 and a side plate 62. The second baffle 61 is located on the side of the second surface 102 opposite to the first surface 101 and is opposite to the first injection hole 190. The side plate 62 is arranged around the first injection hole 190 and the second baffle 61, and connects the second baffle 61 and the second surface 102.

[0065] The protective cover 60 is provided with a through hole 65. The through hole 65 extends through the protective cover 60 along the width direction of the lower insulating member 100 and communicates with the second injection hole 230. Specifically, the through hole 65 extends through the side plate 62 along the width direction of the lower insulating member 100. The through hole 65 facilitates the entry of electrolyte from the first injection hole 190 into the receiving cavity 2001 through the through hole 65. It should be noted that the through hole 65 only extends through the side plate 62 along the width direction of the lower insulating member 100, ensuring that the side plate 62 has no openings along the length direction of the lower insulating member 100. During the electrolyte injection process, the side plate 62 can prevent the electrolyte from directly entering the first vent hole 170 through the first injection hole 190 and impacting the explosion-proof valve 300, thereby improving the safety performance of the energy storage device 1000. There are two through holes 65, which are arranged opposite each other along the width direction of the lower insulating member 100.

[0066] Please refer to the following: Figure 11A reinforcing rib Q is disposed on the bottom wall surface 141 of the first groove and connected between the side wall surface 142 of the first groove and the side wall surface 143 of the second groove. In this embodiment, the length direction of the reinforcing rib Q is parallel to the length direction of the lower insulating member 100. Multiple reinforcing ribs Q are provided. Multiple reinforcing ribs Q are arranged at intervals along the width direction of the lower insulating member 100. For example, multiple reinforcing ribs Q are arranged in parallel. By providing multiple reinforcing ribs Q, the structural strength of the second boss 110 can be enhanced, ensuring that the second boss 110 can better resist and restrict the battery cell assembly 3000, thereby improving the stability of the internal structure of the energy storage device 1000, reducing safety risks, and improving the safety performance and reliability of the energy storage device 1000. For example, each first groove 140 has five reinforcing ribs Q, and the thickness of each reinforcing rib Q is 1 mm.

[0067] Please continue reading. Figure 7 The end cap 200 can be a smooth aluminum sheet. The end cap 200 is located on the side of the first surface 101 facing away from the second surface 102 and abuts against the first surface 101. It should be noted that the distance between the fourth surface 53 and the first surface 101 is greater than or equal to 1 mm, ensuring a certain gap between the first baffle 51 and the end cap 200. Under external force or vibration, this prevents the first baffle 51 from impacting the explosion-proof valve 300 and avoids the first baffle 51 affecting the structural stability of the end cap assembly 4000.

[0068] The end cap 200 is provided with an explosion-proof hole 210, a second pole hole 220, and a second injection hole 230. The explosion-proof hole 210, the second pole hole 220, and the second injection hole 230 all penetrate the end cap 200 along its thickness direction. Along the length of the end cap 200, the explosion-proof hole 210 is located in the middle of the end cap 200 and corresponds to the first vent hole 170. It should be noted that the correspondence between the explosion-proof hole 210 and the first vent hole 170 means that the projection of the explosion-proof hole 210 onto the lower insulating member 100 will cover at least a portion of the first vent hole 170.

[0069] The second electrode post hole 220 is spaced apart from the explosion-proof hole 210 and communicates with the first electrode post hole 180 to allow the electrode post 500 to pass through. There are two second electrode post holes 220. Along the length of the end cap 200, the two second electrode post holes 220 are located on either side of the explosion-proof hole 210 and communicate with the two first electrode post holes 180 respectively. Specifically, one second electrode post hole 220 communicates with one first electrode post hole 180 for the positive electrode post to pass through. The other second electrode post hole 220 communicates with the other first electrode post hole 180 for the negative electrode post to pass through. The second injection hole 230 is located between the explosion-proof hole 210 and one of the second electrode post holes 220, spaced apart from both, and communicates with the first injection hole 190.

[0070] The explosion-proof valve 300 covers the opening of the explosion-proof hole 210 on the fourth surface 53. It is important to note that the first vent 170 is correspondingly positioned to the explosion-proof valve 300, and its projection on the end cap 200 covers the explosion-proof valve 300. This ensures that when the energy storage device 1000 is venting, the area in the middle of the lower insulating member 100 corresponding to the explosion-proof valve 300 is not physically obstructed from gas flow. Gas can quickly pass through the first vent 170 to reach the explosion-proof valve 300, causing the explosion-proof valve 300 to open and release pressure, thus improving the venting performance and safety performance of the energy storage device 1000. In this embodiment, the projection of the first vent 170 on the end cap 200 also covers part of the end cap 200 to increase the size of the first vent 170, which can accelerate the venting speed of the lower insulating member, thereby further improving the venting performance of the lower insulating member. In addition, the projection of the partition 50 on the end cap 200 is offset from that of the explosion-proof valve 300 to ensure that the partition 50 does not affect the gas entering the first vent 170 and being discharged to the explosion-proof valve 300. This not only prevents the misaligned tab 3200 from abnormally overlapping with the end cap 200, but also improves the exhaust performance and safety performance of the energy storage device 1000.

[0071] The protective plate 400 covers the opening of the explosion-proof hole 210 on the third surface 50a and protects the explosion-proof valve 300. Along the thickness direction of the end cap assembly 4000, each pole post 500 passes through a second pole post hole 220 and a first pole post hole 180. Each connecting piece is located on the side of the second surface 102 away from the first surface 101, between a first boss 120 and a second boss 110, and is electrically connected to a pole post 500. Each upper insulating member is disposed around a pole post 500 and passes through a second pole post hole 220 and a first pole post hole 180. Each sealing ring is fitted onto a pole post 500 and onto an upper insulating member, and passes through a first pole post hole 180. It is also clamped between the end cap 200 and a pole post 500. This not only seals the gap between the end cap 200 and the pole post 500, ensuring good airtightness of the end cap assembly 4000, but also insulates the end cap 200 and the pole post 500.

[0072] Please continue reading. Figure 3 The Mylar membrane 5000 is thermally fused to the second side 114 of the two second protrusions 110 to isolate the housing and the cell assembly 3000 and to protect the cell assembly 3000, thereby improving the safety performance of the energy storage device 1000.

[0073] Please see Figure 13 , Figure 13 yes Figure 6 The diagram shows the structure of the lower insulating member 100 in the second embodiment of the end cap assembly 4000.

[0074] The difference between this embodiment and the first embodiment is that the partition portion 50 only includes the vertical wall 55. It should be noted that the third surface 50a of the partition portion 50 includes the connecting surface 58 of the vertical wall 55.

[0075] Please see Figure 14 , Figure 14 yes Figure 6 The diagram shows the structure of the lower insulating member 100 in the end cap assembly 4000 under the third embodiment.

[0076] The difference between this embodiment and the second embodiment is that the partition 50 includes a plurality of pillars 55a, that is, the wall 55 includes a plurality of pillars 55a. The plurality of pillars 55a are spaced apart around the first vent 170. The spacing between the plurality of pillars 55a may be equal or unequal, and this application does not limit this. It should be noted that the spaced arrangement of the plurality of pillars 55a can reduce the material of the partition 50, save manufacturing costs, and also increase the exhaust channel of the lower insulating member 100. While preventing abnormal overlap between the misaligned electrode tab 3200 and the end cover 200, it also enables the lower insulating member 100 to have good exhaust performance, thereby improving the safety performance of the energy storage device 1000.

[0077] In this embodiment, the form of the column 55a includes, but is not limited to, cylindrical, square, triangular, hollow cylinder or frustum, etc., features with raised characteristics.

[0078] The energy storage device 1000 provided in this application, by providing a partition portion 50 in the lower insulating member 100, and positioning the third surface 50a of the partition portion 50 on the side of the surface of the first boss 120 closer to the second surface 102, ensures that the partition portion 50 does not protrude relative to the surface of the first boss 120. This ensures that the first boss 120 is always the force point that presses against the cell assembly 3000, and that the partition portion 50 does not press against the cell assembly 3000, thereby ensuring the structural stability of the partition portion 50. This improves the structural stability of the end cap assembly 4000, better prevents misaligned tabs 3200 from abnormally overlapping with the end cap 200, and enhances the safety performance of the energy storage device 1000. Simultaneously, the partition portion 50 is provided with a second vent 510 and a third vent 520 to ensure that the partition portion 50 does not affect the venting of the lower insulating member 100, thereby ensuring that the energy storage device 1000 has good venting performance and safety performance.

[0079] This application also provides an electrical device, such as an energy storage cabinet or a new energy vehicle. This electrical device includes the energy storage device 1000 described in the above embodiments. The energy storage device 1000 supplies power to the electrical device. Since the specific structure and technical effects of the energy storage device 1000 have already been described in detail above, they will not be repeated here. The electrical device provided in this embodiment, by incorporating the aforementioned energy storage device 1000, improves the exhaust performance and operational safety and reliability of the electrical device.

[0080] The above descriptions are merely optional embodiments of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this application and are not intended to limit the patent scope of this application. At the same time, for those skilled in the art, equivalent structural transformations made based on the concept of this application using the specification and drawings of this application, or direct / indirect applications in other related technical fields, are all included within the patent protection scope of this application.

Claims

1. A lower insulating element for use in an energy storage device, characterized in that, The lower insulating member has a first surface and a second surface, and the first surface and the second surface are disposed opposite to each other along the thickness direction of the lower insulating member; The lower insulating component is provided with a first vent hole, which penetrates the first surface and the second surface; The lower insulating member is provided with a first protrusion and a partition. The first protrusion and the partition are both provided on the second surface. The first protrusion is adjacent to the first vent hole. The first protrusion has a first protrusion surface, which is the surface of the first protrusion facing away from the second surface, and it presses against the cell assembly of the energy storage device. The partition portion is arranged around the first vent hole and is used to separate the electrode tab of the battery cell assembly from the first vent hole. The partition portion has a third surface, which is the surface of the partition portion facing away from the second surface and is located on the side of the first boss surface close to the second surface.

2. The lower insulating member according to claim 1, characterized in that, There are two first protrusions, located on opposite sides of the first vent hole along the width direction of the lower insulating member, and the partition is located between the two first protrusions.

3. The lower insulating member according to claim 2, characterized in that, The partition includes a vertical wall disposed on the second surface and surrounding the first vent hole.

4. The lower insulating member according to claim 2, characterized in that, The partition includes multiple columns, which are spaced apart around the first vent hole.

5. The lower insulating member according to claim 3, characterized in that, The partition also includes a first baffle, which is located on the side of the second surface away from the first surface and is disposed opposite to the first vent. The first baffle includes the third surface and a fourth surface, which are disposed opposite to the third surface. The first baffle is provided with a second vent, which penetrates the third surface and the fourth surface and is disposed opposite to the first vent. The vertical wall surrounds the first baffle and is connected to the first baffle.

6. The lower insulating member according to claim 5, characterized in that, Along the thickness direction of the lower insulating member, the distance between the fourth surface and the first surface is greater than or equal to 1 mm.

7. The lower insulating member according to any one of claims 1 to 6, characterized in that, The partition is provided with a third vent hole. Along the length of the lower insulating member, the third vent hole penetrates the partition and communicates with the first vent hole.

8. The lower insulating member according to claim 7, characterized in that, The battery cell assembly includes two cores arranged along the width direction of the lower insulation member, and the third vent hole is located between the tabs of the two cores along the width direction of the lower insulation member.

9. The lower insulating member according to claim 8, characterized in that, In the width direction of the lower insulating member, the minimum distance between the third vent hole and the tab is greater than or equal to 2 mm and less than or equal to 9 mm.

10. The lower insulating member according to any one of claims 1 to 6, characterized in that, The lower insulating component is further provided with a first liquid injection hole, which penetrates the first surface and the second surface and is spaced apart from the first vent hole; The lower insulating component is also provided with a protective cover, which is disposed on the second surface and covers the first injection hole; The protective cover has a through hole that extends through the protective cover along the width direction of the lower insulating member.

11. An end cap assembly, characterized in that, The device includes a lower insulating component, an end cap, and an explosion-proof valve as described in any one of claims 1 to 10, wherein the end cap is located on the side of the first surface opposite to the second surface, and the end cap is provided with an explosion-proof hole, which is disposed opposite to the first vent hole; The explosion-proof valve is installed on the end cap and covers the explosion-proof hole.

12. The end cap assembly according to claim 11, characterized in that, The projection of the first vent on the end cap covers the explosion-proof valve, and the projection of the partition on the end cap is offset from that of the explosion-proof valve.

13. An energy storage device, characterized in that, The energy storage device includes a housing, a cell assembly, and an end cap assembly as described in claim 11 or 12. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing and contains electrolyte. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The cell assembly is housed in the receiving cavity. The end cap assembly is mounted on the housing, closes the opening, and is electrically connected to the cell assembly. The first boss abuts against the cell assembly.

14. An electrical appliance, characterized in that, Includes the energy storage device as described in claim 13, wherein the energy storage device is used to supply power to the electrical equipment.

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