Lower insulating part, end cover assembly, energy storage device and electric equipment

Abstract

According to the lower insulating part, the end cover assembly, the energy storage device and the electric equipment, the battery cell space in the energy storage device is increased, the interior of the energy storage device is better filled with electrolyte, and therefore the production efficiency of the energy storage device is improved, the lower insulating part comprises the first surface and the second surface, the second surface of the lower insulating part is provided with the two bosses, and the two bosses are arranged on the first surface. The two bosses are arranged at intervals; the lower insulating part is provided with two first grooves and a first liquid injection hole, the two first grooves are arranged at intervals in the width direction of the lower insulating part, openings of the two first grooves are located in the first surface, each first groove is sunken from the first surface to the direction of one boss and comprises a groove side wall, the groove side wall is provided with a first through hole, and the first through hole is communicated with the first through hole. The first through hole penetrates through the groove side wall in the thickness direction of the groove side wall, the first liquid injection hole is located in one side of the two bosses, the first liquid injection hole and the two bosses are arranged at intervals, and the first liquid injection hole penetrates through the first surface and the second surface.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a lower insulating member, an end cover assembly, an energy storage device and an electrical equipment. Background Art

[0002] As energy storage devices are increasingly used, more and more practical production problems have become the focus of public attention. During the process of injecting electrolyte into the energy storage device, the battery cell space inside the energy storage device is small, and the space for injecting electrolyte is limited, which is not conducive to the electrolyte filling the interior of the energy storage device better and faster, affecting the production efficiency of the energy storage device. Summary of the invention

[0003] The present application provides a lower insulating member, an end cover assembly, an energy storage device and electrical equipment, which increase the battery cell space inside the energy storage device, increase the infiltration speed of the electrolyte, and enable the electrolyte to better fill the interior of the energy storage device, thereby improving the production efficiency of the energy storage device.

[0004] The present application provides a lower insulating member, comprising a first surface and a second surface, wherein along the thickness direction of the lower insulating member, the second surface is arranged opposite to the first surface;

[0005] The lower insulating member is provided with two bosses, both of which are provided on the second surface and both protrude from the second surface in a direction away from the first surface, and along the width direction of the lower insulating member, the two bosses are arranged at intervals;

[0006] The lower insulating member is provided with two first grooves and a first injection hole, the two first grooves are arranged at intervals along the width direction of the lower insulating member, the openings of the two first grooves are both located on the first surface, each of the first grooves is recessed from the first surface toward a direction of the boss, each of the first grooves includes a groove side wall, the groove side wall is provided with a first through hole, the first through hole penetrates the groove side wall along the thickness direction of the groove side wall, along the length direction of the lower insulating member, the first injection hole is located on one side of the two bosses, and is spaced apart from the two bosses, the first injection hole penetrates the first surface and the second surface, and is spaced apart from the two first grooves.

[0007] There are a plurality of the first through holes, and the plurality of the first through holes are arranged at intervals;

[0008] Each of the groove side walls includes a first groove side wall portion and a second groove side wall portion connected to the first groove side wall portion. Along the width direction of the lower insulating member, the first groove side wall portions of the two first grooves are arranged back to back, and the first groove side wall portion and the second groove side wall portion are both provided with the first through hole.

[0009] Among them, the lower insulating member is also provided with a protective cover, which is arranged on the second surface and covers the first injection hole. The protective cover includes a baffle and a side plate. The baffle is located on the side of the second surface away from the first surface, and is spaced from the second surface and opposite to the first injection hole. The side plate is arranged around the baffle and the first injection hole, and is connected between the baffle and the second surface. The side plate is provided with a second through hole, and the second through hole penetrates the side plate along the thickness direction of the side plate and is connected to the first injection hole.

[0010] Among them, the baffle includes a third surface and a fourth surface, the third surface faces the first injection hole, and the fourth surface is arranged opposite to the third surface along the thickness direction of the baffle. Along the direction from the first injection hole to the side plate, the distance between the third surface and the fourth surface gradually decreases.

[0011] The first through hole includes a first hole wall surface and a second hole wall surface, the second hole wall surface is located on the side of the first hole wall surface away from the first surface, and is opposite to and spaced from the first hole wall surface, and the distance between the second hole wall surface and the first hole wall surface is h 1 ;

[0012] The second through hole comprises a third hole wall surface and a fourth hole wall surface, the third hole wall surface is flush with the first hole wall surface, and the fourth hole wall surface is located on a side of the third hole wall surface away from the first surface and is flush with the third surface;

[0013] The angle between the third surface and the second surface is α, the distance between the first injection hole and the boss is s, and the height of the first through hole is h. 1 ,h 1 Greater than or equal to s*tanα.

[0014] Wherein, the angle α is greater than or equal to 5 degrees and less than or equal to 30 degrees.

[0015] The baffle is provided with a second groove, the opening of the second groove is located on the third surface, the second groove is recessed from the third surface toward the fourth surface, and is arranged around the first liquid injection hole.

[0016] Among them, the lower insulating member is also provided with a convex ring, which is arranged on the second surface and protrudes from the second surface in a direction away from the first surface and is arranged around the first injection hole. The convex ring is arranged opposite to the second groove and is spaced apart from the bottom wall of the second groove.

[0017] Wherein, the distance between the convex ring and the bottom wall of the second groove is greater than or equal to 0.5 mm and less than or equal to 5.0 mm.

[0018] Wherein, the lower insulating member is provided with a baffle, the baffle is located in the first injection hole and connected to the hole wall of the first injection hole, the baffle is provided with a third through hole, and the third through hole penetrates the baffle along the thickness direction of the baffle.

[0019] Wherein, the first injection hole includes a sink groove portion and an injection portion, the opening of the sink groove portion is located on the first surface, the sink groove portion is recessed from the first surface to the second surface, the sink groove portion includes a groove bottom wall surface, the groove bottom wall surface is arranged opposite to the opening of the sink groove portion, the injection portion is located between the sink groove portion and the second surface, and is communicated with the sink groove portion, the baffle is located in the injection portion, and the distance between the baffle and the groove bottom wall surface is smaller than the distance between the baffle and the second surface.

[0020] Among them, it includes any of the above-mentioned lower insulating parts and end covers, the end cover is located on the side of the first surface away from the second surface, the end cover is provided with a second injection hole, the second injection hole penetrates the end cover along the thickness direction of the end cover, and the second injection hole is connected to the first injection hole.

[0021] The lower insulating member is provided with a first air hole, the first air hole passes through the first surface and the second surface, and along the width direction of the lower insulating member, the first air hole is located between the two bosses and is spaced apart from the two bosses;

[0022] The end cover is also provided with an explosion-proof hole, which penetrates the end cover along the thickness direction of the end cover, is spaced apart from the second liquid injection hole, and is arranged opposite to the first air permeability hole;

[0023] The end cover assembly further includes an explosion-proof valve, which is installed on the end cover, covers the explosion-proof hole, and is arranged opposite to the first air vent.

[0024] The present application also provides an energy storage device, which includes a shell, a battery cell assembly and an end cover assembly as described above, wherein the shell is provided with a receiving cavity and an opening, the receiving cavity is located on the inner side of the shell and contains electrolyte, the opening is located on the top side of the receiving cavity and is communicated with the receiving cavity, the battery cell assembly is received in the receiving cavity, the end cover assembly is installed on the shell, closes the opening, and is electrically connected to the battery cell assembly, and the two bosses abut against the battery cell assembly.

[0025] The present application also provides an electrical device, comprising the above-mentioned energy storage device, wherein the energy storage device is used to supply power to the electrical device.

[0026] The energy storage device provided in this embodiment increases the internal space of the energy storage device by means of two bosses spaced apart on the lower insulating member, thereby ensuring that more electrolyte can be injected into the energy storage device. At the same time, the height design of the first through hole is conducive to the electrolyte entering the interior of the boss after being sprayed from the first injection hole, and then flowing to the side wall of the energy storage device through the first through hole, thereby increasing the infiltration speed of the electrolyte and better allowing the electrolyte to fill the interior of the energy storage device, thereby improving the production efficiency of the energy storage device. In addition, the design of the convex ring, the second groove and the baffle in the lower insulating member can buffer the injection speed of the electrolyte, effectively blocking the backflow of the electrolyte, and at the same time not affecting the flow of the electrolyte to every corner of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0028] Figure 1 is a schematic diagram of the structure of the energy storage device provided in an embodiment of the present application;

[0029] Figure 2 yes Figure 1 A schematic diagram of the exploded structure of the energy storage device shown;

[0030] Figure 3 yes Figure 2 A schematic diagram of the structure of the end cover assembly of the energy storage device shown;

[0031] Figure 4 yes Figure 3 An exploded structural diagram of the end cap assembly shown;

[0032] Figure 5 yes Figure 3 The structure schematic diagram of the end cover assembly after being cut along AA;

[0033] Figure 6 yes Figure 4 A schematic diagram of the structure of the lower insulating member in the end cap assembly shown;

[0034] Figure 7 yes Figure 6 A schematic diagram of the structure of the lower insulating member shown at another angle;

[0035] Figure 8 yes Figure 6 The schematic diagram of the structure of the lower insulating member cut along BB is shown;

[0036] Fig. 9 yes Figure 6 The schematic diagram of the cross-sectional structure of the lower insulating member shown is taken at another angle after being cut along BB.

[0037] Reference numerals: energy storage device 1000, housing 2000, battery cell assembly 3000, end cover assembly 4000, accommodating cavity 2001, opening 2002, lower insulating member 400, end cover 100, explosion-proof valve 200, protective sheet 300, pole 500, connecting sheet 600, upper insulating member 700, sealing ring 800, first surface 401, second surface 402, first peripheral side surface 403, boss 410, first air vent 420, first pole hole 430, first liquid injection hole 440, first groove 450, sinking groove part 441, liquid injection part 442, groove bottom wall 441a, groove side wall 441b, Groove bottom wall 451, groove side wall 452, first groove side wall portion 452a, second groove side wall portion 452b, second air vent 453, first through hole 454, first hole wall surface 455, second hole wall surface 456, convex ring 460, protective cover 470, baffle 10, side plate 20, third surface 11, fourth surface 12, angle α, second through hole 21, third hole wall surface 21a, fourth hole wall surface 21b, second groove 13, baffle 480, third through hole 481, fifth surface 101, sixth surface 102, second peripheral side surface 103, explosion-proof hole 110, second pole hole 120, second liquid injection hole 130. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] See also Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the structure of an energy storage device 1000 provided in an embodiment of the present application, Figure 2 yes Figure 1 A schematic diagram of the exploded structure of the energy storage device 1000 is shown.

[0040] The present application provides an energy storage device 1000, which may include but is not limited to a single cell, a battery module, a battery pack, a battery system, etc. The actual application form of the energy storage device provided in the embodiment of the present application may be, but is not limited to, the listed products, and may also be other application forms. The embodiment of the present application does not strictly limit the application form of the energy storage device 1000. The embodiment of the present application takes the energy storage device 1000 as a square battery as an example for explanation.

[0041] The energy storage device 1000 includes a shell 2000, a battery cell assembly 3000 and an end cover assembly 4000. The shell 2000 is provided with a receiving cavity 2001 and an opening 2002. The receiving cavity 2001 is located on the inner side of the shell 2000 and contains an electrolyte. The opening 2002 is located on the top side of the receiving cavity 2001 and is connected to the receiving cavity 2001. Among them, the shell 2000 can be made of aluminum, for example, the shell 2000 can be an aluminum shell. The battery cell assembly 3000 is accommodated in the receiving cavity 2001. The battery cell assembly 3000 can be immersed in the electrolyte. The end cover assembly 4000 is installed on the shell 2000, closes the opening 2002, and is electrically connected to the battery cell assembly 3000.

[0042] See also Figures 3 to 5 , Figure 3 yes Figure 2 The schematic diagram of the structure of the end cover assembly 4000 of the energy storage device 1000 is shown. Figure 4 yes Figure 3 The exploded structural diagram of the end cap assembly 4000 is shown in FIG. Figure 5 yes Figure 3 The structure diagram of the end cover assembly 4000 shown is a schematic diagram after being cut open along AA.

[0043] The end cap assembly 4000 includes a lower insulating member 400, an end cap 100, an explosion-proof valve 200, a protective sheet 300, a pole 500, a connecting sheet 600, an upper insulating member 700 and a sealing ring 800. Along the thickness direction of the end cap assembly 4000, the end cap 100 is located on one side of the lower insulating member 400. The explosion-proof valve 200 and the protective sheet 300 are both installed on the end cap 100. Along the thickness direction of the end cap assembly 4000, the pole 500 passes through the end cap 100 and the lower insulating member 400. Among them, there are two poles 500, and the two poles 500 are arranged at intervals along the length direction of the end cap assembly 4000. One pole 500 is used as a positive pole, and the other pole 500 is used as a negative pole. The connecting sheet 600 is located on the side of the lower insulating member 400 away from the end cap 100, and is electrically connected to the pole 500 and the pole ear of the battery cell assembly. Among them, there are two connecting pieces 600, each of which is fixedly connected to a pole 500. One connecting piece 600 is used as a positive connecting piece, and is electrically connected to the positive pole column and the positive pole ear of the battery cell assembly 3000. Another connecting piece 600 is used as a negative connecting piece, and is electrically connected to the negative pole column and the negative pole ear of the battery cell assembly 3000. The upper insulating member 700 is installed between the pole 500 and the end cover 100. Among them, there are two upper insulating members 700, each of which is installed between a pole 500 and the end cover 100. One upper insulating member 700 is used as a positive insulator and is installed between the positive pole column and the end cover 100. The other upper insulating member 700 is used as a negative insulator and is installed between the negative pole column and the end cover 100. The sealing ring 800 is sleeved on the upper insulating member 700 and clamped between the end cover 100 and the pole 500. There are two sealing rings 800, each of which is sleeved on an upper insulating member 700 and clamped between the end cover 100 and a pole 500. One sealing ring 800 is used as a positive electrode sealing ring, sleeved on the positive electrode insulating member, and clamped between the end cover 100 and the positive pole. The other sealing ring 800 is used as a negative electrode sealing ring, sleeved on the negative electrode insulating member, and clamped between the end cover 100 and the negative pole.

[0044] See also Figure 6 and Figure 7 , Figure 6 yes Figure 4 The schematic structural diagram of the lower insulating member 400 in the end cap assembly 4000 is shown. Figure 7 yes Figure 6 The structure schematic diagram of the lower insulating member 400 is shown at another angle.

[0045] The lower insulating member 400 includes a first surface 401, a second surface 402 and a first peripheral side surface 403. Along the thickness direction of the lower insulating member 400, the second surface 402 is disposed opposite to the first surface 401. The first peripheral side surface 403 is connected between the first surface 401 and the second surface 402.

[0046] The lower insulating member 400 is provided with a boss 410. Along the length direction of the lower insulating member 400, the boss 410 is located in the middle of the lower insulating member 400. The boss 410 is provided on the second surface 402, and protrudes from the second surface 402 in a direction away from the first surface 401, and abuts against the battery cell assembly 3000. There are two bosses 410. Along the width direction of the lower insulating member 400, the two bosses 410 are respectively located at opposite ends of the lower insulating member 400 and are spaced apart from each other.

[0047] In the lower insulating member 400 shown in this embodiment, two spaced bosses 410 are provided, and the space between the two bosses 410 can increase the space inside the energy storage device 1000, which can not only increase the space of the battery cell assembly 3000, but also provide space for injecting more electrolyte, which is conducive to the electrolyte filling the interior of the energy storage device 1000 better. At the same time, the provision of the boss 410 is also conducive to the lower insulating member 400 pressing the battery cell assembly 3000 when the energy storage device 1000 is in thermal runaway, limiting the movement of the battery cell assembly 3000 in the thickness direction of the energy storage device 1000, and improving the safety performance of the energy storage device 1000.

[0048] The lower insulating member 400 is provided with a first air hole 420, a first pole hole 430, a first liquid injection hole 440 and a first groove 450. The first air hole 420, the first pole hole 430 and the first liquid injection hole 440 all penetrate the first surface 401 and the second surface 402. Along the length direction of the lower insulating member 400, the first air hole 420 is located in the middle of the lower insulating member 400. Along the width direction of the lower insulating member 400, the first air hole 420 is located between the two bosses 410 and is spaced apart from the two bosses 410. There are a plurality of first air holes 420, and the plurality of first air holes 420 are spaced apart from each other.

[0049] Along the length direction of the lower insulating member 400, the first pole hole 430 is located on one side of the first vent hole 420, and is spaced apart from the first vent hole 420, and is connected to the second pole hole 120 for the pole 500 to pass through. There are two first pole holes 430. Along the length direction of the lower insulating member 400, the two first pole holes 430 are respectively located on opposite sides of the first vent hole 420.

[0050] The first injection hole 440 is located on one side of the two bosses 410, and is located between the first air hole 420 and a first pole hole 430, and is spaced apart from the first air hole 420 and the first pole hole 430. The first injection hole 440 penetrates the lower insulating member along the thickness direction of the lower insulating member 400. Specifically, the first injection hole 440 includes a sinking groove portion 441 and an injection portion 442. The opening of the sinking groove portion 441 is located on the first surface 401. The sinking groove portion 441 is recessed from the first surface 401 to the second surface 402. The sinking groove portion 441 includes a groove bottom wall surface 441a and a groove side wall surface 441b. The groove bottom wall surface 441a is arranged opposite to the opening of the sinking groove portion 441, and is located between the first surface 401 and the second surface 402. The groove side wall surface 441b is connected between the groove bottom wall surface 441a and the first surface 401. The injection portion 442 is located between the recessed groove portion 441 and the second surface 402. The injection portion 442 is located on the groove bottom wall 441a and penetrates the groove bottom wall 441a and the second surface 402 along the thickness direction of the lower insulating member 400. The injection portion 442 is connected to the recessed groove portion 441.

[0051] See also Figure 8 , Figure 8 yes Figure 6 The cross-sectional structure diagram of the lower insulating member 400 is shown along line BB.

[0052] Along the width direction of the lower insulating member 400, the first groove 450 is located on one side of the first vent hole 420 and is spaced apart from the first vent hole 420 and the first peripheral side surface 403. The first groove 450 is disposed correspondingly to the boss 410. It should be noted that the first groove 450 is disposed correspondingly to the boss 410 means that the orthographic projection of the first groove 450 on the boss 410 at least partially covers the boss 410.

[0053] Specifically, the opening of the first groove 450 is located on the first surface 401. The first groove 450 is recessed from the first surface 401 in the direction of the boss 410. The first groove 450 includes a groove bottom wall 451 and a groove side wall 452. The groove bottom wall 451 is arranged opposite to the opening of the first groove 450, and is located on the side of the second surface 402 away from the first surface 401, and is spaced apart from the second surface 402. The groove side wall 452 is arranged around the groove bottom wall 451 and is connected to the groove bottom wall 451. There are two first grooves 450. Along the width direction of the lower insulating member 400, the two first grooves 450 are arranged at intervals, and are respectively arranged opposite to the two bosses 410. The two first grooves 450 are respectively located on opposite sides of the first air vent 420, and are spaced apart from the first air vent 420.

[0054] The groove bottom wall 451 is provided with a second air hole 453. The second air hole 453 penetrates the groove bottom wall 451 along the thickness direction of the groove bottom wall 451 and is connected to the first groove 450. There are multiple second air holes 453, and the multiple second air holes 453 are distributed at intervals. The provision of the second air holes 453 can ensure the exhaust performance of the energy storage device 1000, and is also conducive to the flow of the electrolyte during the injection process.

[0055] The groove side wall 452 is provided with a first through hole 454. The first through hole 454 penetrates the groove side wall 452 along the thickness direction of the groove side wall 452 and is connected to the first groove 450. Exemplarily, the first through hole 454 is a rectangular through hole. The first through hole 454 includes a first hole wall surface 455 and a second hole wall surface 456. The first hole wall surface 455 is a portion of the hole inner wall of the first through hole 454 close to the first surface 401, and can be flush with the second surface 402. The second hole wall surface 456 is located on the side of the first hole wall surface 455 away from the first surface 401, and is opposite to the first hole wall surface 455 and spaced apart. The distance between the second hole wall surface 456 and the surface of the groove bottom wall 451 away from the second surface 402 is greater than 0.8 mm, so as to ensure that the boss 410 in the energy storage device 1000 has sufficient pressure and strength to resist the movement of the battery cell assembly 3000 in the thickness direction of the energy storage device 1000. The distance between the second hole wall surface 456 and the first hole wall surface 455 is equal to the height h of the first through hole 454. 1 There are a plurality of first through holes 454. The plurality of first through holes 454 are disposed around the groove sidewall 452 of the first groove 450 and are spaced apart from each other.

[0056] In this embodiment, each groove sidewall 452 includes a first groove sidewall portion 452a and a second groove sidewall portion 452b connected to the first groove sidewall portion 452a. The first groove sidewall portions 452a of the two first grooves 450 are respectively located at opposite ends of the width direction of the lower insulating member 400. Specifically, the second groove sidewall portion 452b is connected to both ends of the first groove sidewall portion 452a, and is enclosed with the first groove sidewall portion 452a to form the first groove 450. The first groove sidewall portion 452a and the second groove sidewall portion 452b are both provided with a first through hole 454.

[0057] The electrolyte flowing out from the first injection hole 440 can flow into the first groove 450 from the first through hole 454 on the second groove side wall portion 452b, and then flow out through the first through hole 454 on the first groove side wall portion 452a, so as to ensure that the electrolyte can flow to the side wall surface of the battery cell assembly 3000, which is beneficial to the infiltration of the electrolyte at the side wall surface position of the battery cell assembly 3000, so as to better allow the electrolyte to fill the interior of the energy storage device 1000.

[0058] The lower insulating member 400 is further provided with a protruding ring 460 and a protective cover 470. The protruding ring 460 is provided on the second surface 402, and protrudes from the second surface 402 in a direction away from the first surface 401, and is provided around the first injection hole 440. The inner side surface of the protruding ring 460 is flush with the hole wall surface of the first injection hole 440.

[0059] The protective cover 470 is disposed on the second surface 402, and covers the first injection hole 440. The protective cover 470 includes a baffle 10 and a side plate 20. The baffle 10 and the side plate 20 are both located on the side of the second surface 402 away from the first surface 401. The baffle 10 is spaced apart from the second surface 402 and completely covers the first injection hole 440, which can not only block the electrolyte reflux, but also prevent the electrode from being flushed during the electrolyte injection process, causing the electrode to fall off. The baffle 10 includes a third surface 11 and a fourth surface 12. Along the thickness direction of the baffle 10, the third surface 11 is disposed opposite to the fourth surface 12, and is spaced apart from the second surface 402, and faces the first injection hole 440. Along the direction from the first injection hole 440 to the side plate 20, the distance between the third surface 11 and the fourth surface 12 gradually decreases. Exemplarily, in this embodiment, the third surface 11 is a conical surface, and along the thickness direction of the lower insulating member 400, the vertex of the conical surface and the center of the first injection hole 440 are located in the same straight line. An angle α is formed between the third surface 11 and the second surface 402, and the angle α is between 5° and 30°, so that the electrolyte can be smoothly injected into the interior of the energy storage device 1000 and diffused to the surroundings in a "lotus shape". In some other embodiments, the third surface 11 can also be designed as a smooth arc-shaped surface.

[0060] The baffle 10 is provided with a second groove 13. The second groove 13 is provided on the third surface 11 and is recessed from the third surface 11 to the fourth surface 12. The second groove 13 can reduce the speed of the electrolyte being injected into the energy storage device 1000, and can further prevent the electrolyte from splashing to the outside of the energy storage device 1000 after the injection is completed, thereby preventing the electrolyte from flowing back.

[0061] The second groove 13 is arranged opposite to the convex ring 460, and the groove bottom wall of the second groove 13 is spaced from the convex ring 460. The second groove 13 and the convex ring 460 together constitute a primary blocking structure. Along the thickness direction of the lower insulating member 400, the distance between the groove bottom wall of the second groove 13 and the convex ring 460 is greater than or equal to 0.5 mm and less than or equal to 5.0 mm, so as to ensure the effectiveness when injecting the electrolyte and the electrolyte can contact the lower insulating member 400 when overflowing, which is beneficial for the lower insulating member 400 to block the overflow of the electrolyte, effectively block the reflux of the electrolyte, and prevent the electrolyte from flowing out to the surface of the end cover 100 and corroding the end cover 100 and flowing out to the pole 500 to produce crystals. Exemplarily, the second groove 13 is an annular groove.

[0062] The side plate 20 is arranged around the baffle plate 10 and the first injection hole 440, and is connected between the baffle plate 10 and the second surface 402. The side plate 20 is provided with a second through hole 21. The second through hole 21 penetrates the side plate 20 along the thickness direction of the side plate 20 to allow the electrolyte to flow out. The second through hole 21 is arranged opposite to the first through hole 454, and the electrolyte flowing out of the second through hole 21 can flow from the first through hole 454 into the first groove 450, and then through the first through hole 454 to the inside of the energy storage device 1000. The second through hole 21 includes a third hole wall surface 21a and a fourth hole wall surface 21b. The third hole wall surface 21a is a portion of the hole wall surface of the second through hole 21 close to the first surface 401, and is flush with the first hole wall surface 455. The fourth hole wall surface 21b is located on the side of the third hole wall surface 21a away from the first surface 401, and is spaced apart from the third hole wall surface 21a, and is flush with the third surface 11. There are a plurality of second through holes 21 , and the plurality of second through holes 21 are arranged at intervals around the baffle 10 .

[0063] See also Fig. 9 , Fig. 9 yes Figure 6 The cross-sectional structure diagram of the lower insulating member 400 at another angle after being cut along line BB.

[0064] In this embodiment, the height h of the first through hole 454 is 1 is greater than or equal to the height h of the electrolyte from the first injection hole 440 to the first through hole 454 2 , that is, h 1 ≥h 2 The height of the electrolyte from the first injection hole 440 to the first through hole 454 is h. 2 ,h 2 =s*tanα, s represents the distance between the first injection hole 440 and the first through hole 454. α represents the angle between the third surface 11 and the second surface 402, that is, the angle formed between the third surface 11 and the fourth surface 12.

[0065] When the height h of the first through hole 454 1 When the height h2 of the electrolyte flowing from the second injection hole to the first through hole 454 is less than the height h2, the distance between the first injection hole 440 and the first through hole 454 needs to be reduced, that is, the distance between the first injection hole 440 and the boss 410 needs to be reduced. 1 The design can ensure that after the electrolyte is injected from the first injection hole 440, it flows along the third surface 11, passes through the second through hole 21 and smoothly flows into the first through hole 454, and then flows from the first through hole 454 of the first groove side wall portion 452a to the side wall surface of the battery cell assembly 3000, so that the electrolyte can better fill the interior of the energy storage device 1000.

[0066] Please continue reading Figure 8 The lower insulating member 400 is further provided with a baffle 480. The baffle 480 is located in the injection portion 442 of the first injection hole 440 and is connected to the hole wall of the first injection hole 440. The distance between the baffle 480 and the groove bottom wall 441a is smaller than the distance between the baffle 480 and the second surface 402, so as to reduce the influence of the baffle 480 on the injection process.

[0067] In addition, the baffle 480 is provided with a third through hole 481. The third through hole 481 penetrates the baffle 480 along the thickness direction of the baffle 480 and is connected to the first injection hole 440 to ensure the smoothness of the injection process. The setting of the baffle 480 can prevent foreign matter from entering the first injection hole 440, thereby preventing foreign matter from falling into the interior of the energy storage device 1000 and being unable to be removed. At the same time, the baffle 480 can serve as a secondary blocking structure to reduce the possibility of electrolyte overflowing to the outside.

[0068] In this embodiment, the thickness of the baffle 480 is about 0.5 mm. The baffle 480 is thinner and more easily deformed, and the degree of deformation is greater. During the injection process, the baffle 480 is prone to deformation, and the addition of the baffle 480 will not significantly change the injection diameter.

[0069] In this embodiment, the baffle 480 and the lower insulating member 400 are both made of polypropylene plastic. The baffle 480 and the lower insulating member 400 can be integrally formed. Exemplarily, the baffle 480 and the lower insulating member 400 can be formed by an integral injection molding process, which can not only simplify the preparation cost of the baffle 480 and the lower insulating member 400, but also save the assembly process of the baffle 480 and the lower insulating member 400.

[0070] Please continue reading Figure 4 and Figure 5 In this embodiment, the end cap 100 can be a plain aluminum sheet made of aluminum. The end cap 100 is located on the side of the first surface 401 away from the second surface 402. The end cap 100 includes a fifth surface 101, a sixth surface 102, and a second peripheral side surface 103. The fifth surface 101 is a surface of the end cap 100 away from the lower insulating member 400. Along the thickness direction of the end cap 100, the sixth surface 102 and the fifth surface 101 are arranged opposite to each other. The second peripheral side surface 103 is connected between the fifth surface 101 and the sixth surface 102.

[0071] The end cover 100 is provided with an explosion-proof hole 110, a second pole hole 120 and a second injection hole 130. The explosion-proof hole 110, the second pole hole 120 and the second injection hole 130 all penetrate the end cover 100 along the thickness direction of the end cover 100, and are spaced apart from the second peripheral side surface 103. Along the length direction of the end cover 100, the explosion-proof hole 110 is located in the middle of the end cover 100 and is arranged opposite to the first air hole 420. It should be pointed out that the explosion-proof hole 110 and the first air hole 420 are arranged opposite to each other, which means that the orthographic projection of the explosion-proof hole 110 on the lower insulating member 400 will at least partially cover the first air hole 420. The second pole hole 120 is spaced apart from the explosion-proof hole 110 and is connected to the first pole hole 430 for the pole 500 to pass through. Among them, there are two second pole holes 120. Along the length direction of the end cover 100, the two second pole holes 120 are respectively located on both sides of the explosion-proof hole 110, and are respectively connected to the two first pole holes 430. Specifically, one second pole hole 120 is connected to one first pole hole 430 for the positive pole to pass through. Another second pole hole 120 is connected to another first pole hole 430 for the negative pole to pass through. The second injection hole 130 is located between the explosion-proof hole 110 and one second pole hole 120, and is spaced apart from the explosion-proof hole 110 and the second pole hole 120, and is connected to the first injection hole 440.

[0072] The explosion-proof valve 200 is disposed opposite to the first air hole 420, and covers the opening of the explosion-proof hole 110 located on the sixth surface 102. It should be noted that the explosion-proof valve 200 is disposed opposite to the first air hole 420, which means that the orthographic projection of the explosion-proof valve 200 on the lower insulating member 400 at least partially covers the first air hole 420. The protective sheet 300 covers the opening of the explosion-proof hole 110 located on the fifth surface 101, and protects the explosion-proof valve 200.

[0073] Along the thickness direction of the end cap assembly 4000, each pole 500 is inserted into a second pole hole 120 and a first pole hole 430. Each connecting piece 600 is located on the side of the second surface 402 away from the end cap 100 and is fixedly connected to a pole 500. Each upper insulating member 700 is arranged around a pole 500 and is inserted into a second pole hole 120 and a first pole hole 430. Each sealing ring 800 is sleeved on an upper insulating member 700, inserted into a second pole hole 120 and a first pole hole 430, and clamped between the sixth surface 102 of the end cap 100 and the surface of a pole 500 close to the end cap 100, which can not only seal the gap between the upper insulating member 700 and the lower insulating member 400 to ensure good airtightness of the end cap assembly 4000, but also insulate the end cap 100 from the pole 500.

[0074] The energy storage device 1000 provided in this embodiment increases the internal space of the energy storage device 1000 by means of two bosses 410 spaced apart on the lower insulating member 400, thereby ensuring that more electrolyte can be injected into the energy storage device 1000. 1 The design is conducive to the electrolyte being injected from the first injection hole 440 into the inside of the boss 410, and then flowing to the side wall surface of the battery cell assembly 3000 through the first through hole 454 of the first groove side wall portion 452a, thereby increasing the infiltration speed of the electrolyte at the side wall surface of the battery cell assembly 3000, and better allowing the electrolyte to fill the inside of the energy storage device 1000, thereby improving the production efficiency of the energy storage device 1000. In addition, the design of the convex ring 460, the second groove 13 and the baffle 480 in the lower insulating member 400 can buffer the injection speed of the electrolyte, effectively block the backflow of the electrolyte, and at the same time do not affect the electrolyte flow to every corner of the energy storage device 1000.

[0075] This embodiment also provides an electrical device, such as an energy storage cabinet, a new energy vehicle, etc. The electrical device includes the energy storage device 1000 in the above embodiment. Since the specific structure and technical effects of the energy storage device 1000 have been described in detail above, they will not be repeated here. The electrical device provided in this embodiment improves the exhaust performance and safety and reliability of the electrical device by setting the above energy storage device 1000.

[0076] The above are only optional embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application, and does not limit the patent scope of the present application. At the same time, for those skilled in the art, according to the inventive concept of the present application, the equivalent structural transformations made by using the description and drawings of the present application, or direct / indirect application in other related technical fields are all included in the patent protection scope of the present application.

Claims

1. A lower insulating member, characterized in that: It comprises a first surface and a second surface, and along the thickness direction of the lower insulating member, the second surface is arranged opposite to the first surface; The lower insulating member is provided with two bosses, both of which are provided on the second surface and both protrude from the second surface in a direction away from the first surface, and along the width direction of the lower insulating member, the two bosses are arranged at intervals; The lower insulating member is provided with two first grooves and a first injection hole, the two first grooves are arranged at intervals along the width direction of the lower insulating member, the openings of the two first grooves are both located on the first surface, each of the first grooves is recessed from the first surface toward a direction of the boss, each of the first grooves includes a groove side wall, the groove side wall is provided with a first through hole, the first through hole penetrates the groove side wall along the thickness direction of the groove side wall, along the length direction of the lower insulating member, the first injection hole is located on one side of the two bosses, and is spaced apart from the two bosses, the first injection hole penetrates the first surface and the second surface, and is spaced apart from the two first grooves.

2. The lower insulator according to claim 1, characterized in that: There are a plurality of the first through holes, and the plurality of the first through holes are arranged at intervals; Each of the groove side walls includes a first groove side wall portion and a second groove side wall portion connected to the first groove side wall portion. Along the width direction of the lower insulating member, the first groove side wall portions of the two first grooves are arranged back to back, and the first groove side wall portion and the second groove side wall portion are both provided with the first through hole.

3. The lower insulating member according to claim 1 or 2, characterized in that: The lower insulating member is also provided with a protective cover, which is arranged on the second surface and covers the first injection hole. The protective cover includes a baffle and a side plate. The baffle is located on the side of the second surface away from the first surface, and is spaced from the second surface and opposite to the first injection hole. The side plate is arranged around the baffle and the first injection hole and is connected between the baffle and the second surface. The side plate is provided with a second through hole, which penetrates the side plate along the thickness direction of the side plate and is connected to the first injection hole.

4. The lower insulator according to claim 3, characterized in that: The baffle includes a third surface and a fourth surface, the third surface faces the first injection hole, and the fourth surface is arranged opposite to the third surface along the thickness direction of the baffle. Along the direction from the first injection hole to the side plate, the distance between the third surface and the fourth surface gradually decreases.

5. The lower insulator according to claim 4, characterized in that: The first through hole comprises a first hole wall surface and a second hole wall surface, the second hole wall surface is located on a side of the first hole wall surface away from the first surface, and is opposite to and spaced from the first hole wall surface, and the distance between the second hole wall surface and the first hole wall surface is h1; The second through hole comprises a third hole wall surface and a fourth hole wall surface, the third hole wall surface is flush with the first hole wall surface, and the fourth hole wall surface is located on a side of the third hole wall surface away from the first surface and is flush with the third surface; The angle between the third surface and the second surface is α, the distance between the first injection hole and the boss is s, the height of the first through hole is h1, and h1 is greater than or equal to s*tanα.

6. The lower insulator according to claim 5, characterized in that: The angle α is greater than or equal to 5 degrees and less than or equal to 30 degrees.

7. The lower insulator according to any one of claims 4 to 6, characterized in that: The baffle is provided with a second groove, the opening of the second groove is located on the third surface, the second groove is recessed from the third surface toward the fourth surface, and is arranged around the first liquid injection hole.

8. The lower insulator according to claim 7, characterized in that: The lower insulating member is also provided with a convex ring, which is arranged on the second surface and protrudes from the second surface in a direction away from the first surface and is arranged around the first injection hole. The convex ring is arranged opposite to the second groove and is spaced apart from the bottom wall of the second groove.

9. The lower insulator according to claim 8, characterized in that: The distance between the convex ring and the groove bottom wall surface of the second groove is greater than or equal to 0.5 mm and less than or equal to 5.0 mm.

10. The lower insulator according to claim 1, characterized in that: The lower insulating member is provided with a baffle, which is located in the first liquid injection hole and connected to the hole wall of the first liquid injection hole. The baffle is provided with a third through hole, and the third through hole penetrates the baffle along the thickness direction of the baffle.

11. The lower insulator according to claim 10, characterized in that: The first injection hole includes a sink groove portion and an injection portion, the opening of the sink groove portion is located on the first surface, the sink groove portion is recessed from the first surface to the second surface, the sink groove portion includes a groove bottom wall surface, the groove bottom wall surface is arranged opposite to the opening of the sink groove portion, the injection portion is located between the sink groove portion and the second surface, and is communicated with the sink groove portion, the baffle is located in the injection portion, and the distance between the baffle and the groove bottom wall surface is smaller than the distance between the baffle and the second surface.

12. An end cap assembly, characterized in that: It includes the lower insulating member and the end cover as described in any one of claims 1 to 11, the end cover is located on the side of the first surface away from the second surface, the end cover is provided with a second injection hole, the second injection hole penetrates the end cover along the thickness direction of the end cover, and the second injection hole is connected to the first injection hole.

13. The end cap assembly according to claim 12, characterized in that: The lower insulating member is provided with a first air hole, the first air hole passes through the first surface and the second surface, and along the width direction of the lower insulating member, the first air hole is located between the two bosses and is spaced apart from the two bosses; The end cover is also provided with an explosion-proof hole, which penetrates the end cover along the thickness direction of the end cover, is spaced apart from the second liquid injection hole, and is arranged opposite to the first air permeability hole; The end cover assembly further includes an explosion-proof valve, which is installed on the end cover, covers the explosion-proof hole, and is arranged opposite to the first air vent.

14. An energy storage device, characterized in that: The energy storage device includes a shell, a battery cell assembly and an end cover assembly as described in claim 12 or 13, the shell is provided with a receiving cavity and an opening, the receiving cavity is located on the inner side of the shell and contains electrolyte, the opening is located on the top side of the receiving cavity and is communicated with the receiving cavity, the battery cell assembly is received in the receiving cavity, the end cover assembly is installed on the shell, closes the opening, and is electrically connected to the battery cell assembly, and the two bosses abut the battery cell assembly.

15. An electrical equipment, characterized in that: It includes the energy storage device as described in claim 14, and the energy storage device is used to supply power to the electrical equipment.

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