End cap assembly, energy storage device, and electric appliance

Abstract

The application provides an end cover assembly, an energy storage device and an electric equipment, reduces the risk of short circuit of the energy storage device, and improves the safety performance of the energy storage device. The end cover assembly comprises an end cover, an explosion-proof valve, a first pressing block, a lower insulating piece and a first fixing piece. The end cover comprises a first surface and a second surface arranged oppositely. The end cover is provided with an explosion-proof hole penetrating through the first surface and the second surface. The explosion-proof valve is installed on the end cover and covers the opening of the explosion-proof hole on the second surface. The first pressing block and the lower insulating piece are both located on the side of the second surface away from the first surface. The first pressing block is located on one side of the explosion-proof hole and is used for supporting the end cover and abutting against the battery cell assembly. The melting point of the first pressing block is higher than that of the lower insulating piece. The lower insulating piece comprises a first sub-insulating piece. The first sub-insulating piece is located on the side of the first pressing block away from the explosion-proof hole. The first fixing piece is arranged on the second surface and located on the side of the first pressing block away from the first sub-insulating piece. The first fixing piece and the first sub-insulating piece jointly clamp the first pressing block.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of energy storage, and in particular to an end cover assembly, an energy storage device and an electric equipment. BACKGROUND

[0002] With the increasingly wide application of the energy storage device, the safety performance of the energy storage device is concerned. When the energy storage device is in thermal runaway, a large amount of high-temperature gas is generated. In the process of discharging the high-temperature gas through the explosion-proof valve, the lower insulating piece is melted, the lower plastic loses the limiting effect on the battery assembly, the battery assembly directly contacts the end cover, thereby causing a short circuit and sparks, and the fire explosion phenomenon is triggered, which brings great safety hazards. SUMMARY

[0003] The application provides an end cover assembly, an energy storage device and an electric equipment, which reduces the risk of short circuit of the energy storage device and improves the safety performance of the energy storage device.

[0004] The application provides an end cover assembly, which comprises an end cover, an explosion-proof valve, a first pressing block, a lower insulating piece and a first fixing piece. The end cover comprises a first surface and a second surface, the second surface and the first surface are oppositely arranged along the thickness direction of the end cover, the end cover is provided with an explosion-proof hole, and the explosion-proof hole penetrates through the first surface and the second surface.

[0005] The explosion-proof valve is mounted on the end cover and covers the explosion-proof hole.

[0006] The first pressing block and the lower insulating piece are located on the side, away from the first surface, of the second surface, the first pressing block is located on one side of the explosion-proof hole and is spaced apart from the explosion-proof hole, the first pressing block is used for supporting the end cover and abutting against a battery assembly, wherein the first pressing block is made of an insulating material, and the melting point of the first pressing block is higher than that of the lower insulating piece.

[0007] The lower insulating piece comprises a first sub-insulating piece, and the first sub-insulating piece is located on the side, away from the explosion-proof hole, of the first pressing block along the length direction of the end cover assembly.

[0008] The first fixing piece is arranged on the second surface and located on the side, away from the first sub-insulating piece, of the first pressing block and is spaced apart from the explosion-proof hole, and the first fixing piece and the first sub-insulating piece jointly clamp and fix the first pressing block.

[0009] The first pressing block is provided with a first through hole, and the first through hole penetrates through the first pressing block along the length direction of the end cover assembly.

[0010] The cross-sectional area of the first through hole is greater than or equal to 1 cm 2 .

[0011] The first through holes are arranged in a spaced manner along a width direction of the end cover assembly.

[0012] The end cover assembly further comprises a second pressing block and a second fixing member, the second pressing block is located on a side of the explosion-proof hole away from the first pressing block and is arranged in a spaced manner with the explosion-proof hole, and the second fixing member is located on a side of the second pressing block close to the explosion-proof hole and is arranged in a spaced manner with the explosion-proof hole.

[0013] The lower insulating member further comprises a second sub-insulating member, the second sub-insulating member is located on a side of the second pressing block away from the explosion-proof hole along a length direction of the end cover assembly, and the second sub-insulating member and the second fixing member jointly clamp and fix the second pressing block.

[0014] The thermal deformation temperature of the first pressing block is greater than or equal to 300 DEG C.

[0015] The first pressing block comprises a first pressing block surface facing away from the second surface, and the first fixing member is located between the second surface and the first pressing block surface.

[0016] The end cover assembly further comprises an insulating tape, the insulating tape is pasted on the second surface and is located between the first fixing member and the second fixing member, the insulating tape is provided with a second through hole, the second through hole penetrates the insulating tape along a thickness direction of the insulating tape and is in communication with the explosion-proof hole.

[0017] The end cover assembly further comprises a baffle, the baffle is installed on a side of the first fixing member and the second fixing member away from the end cover.

[0018] The end cover assembly further comprises a baffle, the baffle is installed on a side of the first pressing block and the second pressing block away from the end cover, the baffle comprises a third surface and a fourth surface, the third surface is a surface of the baffle facing away from the second surface and is used for abutting against the battery cell assembly, the fourth surface is arranged in a back-to-back manner with the third surface along a thickness direction of the baffle and abuts against the pressing block.

[0019] The baffle is provided with a first protrusion and a second protrusion, the first protrusion and the second protrusion are both arranged on the fourth surface, the first protrusion is located on a side of the first pressing block away from the second pressing block, the second protrusion is located on a side of the second pressing block away from the first pressing block and jointly clamps the first pressing block and the second pressing block with the first protrusion.

[0020] The baffle is further provided with a third through hole, the third through hole penetrates the baffle along a thickness direction of the baffle and is in communication with the explosion-proof hole.

[0021] The width of the first pressing block is greater than or equal to 5 mm.

[0022] This application also provides an energy storage device, which includes a housing, a battery cell assembly, and any of the above-mentioned end cap assemblies. 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 installed on the housing, closes the opening, and is electrically connected to the battery cell assembly. The first pressure block abuts against the battery cell assembly.

[0023] This application also provides an electrical device including the above-described energy storage device, which is used to supply power to the electrical device.

[0024] The end cap assembly, energy storage device, and electrical equipment provided in this application utilize a pressure block within the end cap assembly. This pressure block presses against the battery cell assembly, restricting its movement within the energy storage device. Simultaneously, the pressure block is made of insulating material, preventing short circuits caused by contact between the end cap and the battery cell assembly. The pressure block has a heat distortion temperature greater than or equal to 300℃, ensuring excellent resistance to heat deformation. Even under high-temperature conditions, the pressure block remains undeformed and consistently supports the end cap and contacts the battery cell assembly, preventing the battery cell assembly from moving towards the end cap and blocking the explosion-proof valve. This prevents short circuits and fires caused by contact between the end cap and the battery cell assembly, thus improving the safety performance of the energy storage device. Furthermore, gas inside the energy storage device can be discharged through the first through-hole of the pressure block to the explosion-proof valve, and then discharged after the explosion-proof valve is opened, ensuring good venting performance of the energy storage device. Attached Figure Description

[0025] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0026] Figure 1 This is a schematic diagram of the energy storage device structure provided in this application;

[0027] Figure 2 yes Figure 1 A schematic diagram of the end cap assembly in the energy storage device shown in the first embodiment;

[0028] Figure 3 yes Figure 2 The diagram shows the end cap assembly from another angle.

[0029] Figure 4 yes Figure 2 The exploded view of the end cap assembly is shown.

[0030] Figure 5 yes Figure 3Structure schematic diagram of the end cover assembly shown after being cut along A-A;

[0031] Figure 6 is Figure 4 Structure schematic diagram of the assembly of the end cover, the fixing member and the insulating tape in the end cover assembly shown;

[0032] Figure 7 is Figure 4 Structure schematic diagram of the lower insulating member shown;

[0033] Figure 8 is Figure 1 Structure schematic diagram of the end cover assembly in the second embodiment in the energy storage device shown;

[0034] Figure 9 is Figure 8 Structure schematic diagram of the baffle in the end cover assembly shown from another angle;

[0035] Figure 10 is Figure 8 Section structure schematic diagram of the end cover assembly shown after being cut along B-B;

[0036] Figure 11 is Figure 1 Structure schematic diagram of the end cover assembly in the third embodiment in the energy storage device shown.

[0037] The figure marks: energy storage device 1000, shell 2000, end cover assembly 3000, opening 2001, end cover 100, explosion-proof valve 200, protective sheet 300, fixing member a, lower insulating member 400, pressing block 500, insulating tape b, pole 600, connecting sheet 700, upper insulating member 800, sealing ring 900, first surface 101, second surface 102, first circumferential side 103, explosion-proof hole 110, first pole hole 120, first liquid injection hole 130, first fixing member a1, second fixing member a2, second through hole b1, first sub-insulating member 410, second sub-insulating member 420, second liquid injection hole 411, second pole hole 412, third pole hole 421, second pressing block surface 501, first pressing block surface 502, first side 503, second side 504, first through hole 510, first hole wall surface 511, second hole wall surface 512, first pressing block 520, second pressing block 530, baffle c, third surface 1, fourth surface 2, second circumferential side 3, third through hole 4, first protrusion 5, second protrusion 6, first protrusion surface 51, third side 52, second protrusion surface 61, fourth side 62. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] Referring to Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of an energy storage device 1000 provided by the present application.

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

[0041] The energy storage device 1000 includes a shell 2000, a battery cell assembly (not shown in the figure) and an end cover assembly 3000. The shell 2000 is provided with a receiving cavity (not shown in the figure) and an opening 2001. The receiving cavity is located on the inner side of the shell 2000 and contains electrolyte. The opening 2001 is located on the top side of the receiving cavity and communicates with the receiving cavity. The shell 2000 can be made of aluminum, for example, the shell 2000 can be an aluminum shell. The battery cell assembly is accommodated in the receiving cavity. The battery cell assembly can be soaked in the electrolyte. The end cover assembly 3000 is installed on the shell 2000 and seals the opening 2001, and is electrically connected with the battery cell assembly.

[0042] Referring to Figures 2 to 5 , Figure 2 is Figure 1 a structural schematic diagram of the end cover assembly 3000 of the energy storage device 1000 shown in Figure 3 is Figure 2 a structural schematic diagram of the end cover assembly 3000 shown in Figure 4 is Figure 2 an exploded structural schematic diagram of the end cover assembly 3000 shown in Figure 5 is Figure 3 a structural schematic diagram of the end cover assembly 3000 shown in

[0043] In this embodiment, the end cover assembly 3000 includes an end cover 100, an explosion-proof valve 200, a protective sheet 300, a fixing member a, a lower insulating member 400, a pressing block 500, an insulating tape b, a pole 600, a connecting sheet 700, an upper insulating member 800, and a sealing ring 900. The explosion-proof valve 200 and the protective sheet 300 are both mounted on the end cover 100. Along the thickness direction of the end cover assembly 3000, the fixing member a, the lower insulating member 400, the pressing block 500, and the insulating tape b are all mounted on the same side of the end cover 100. Along the thickness direction of the end cover assembly 3000, the pole 600 penetrates through the end cover 100 and the lower insulating member 400. Among them, the pole 600 has two, and along the length direction of the end cover assembly 3000, the two poles 600 are arranged at intervals. One pole 600 is used as a positive pole, and the other pole 600 is used as a negative pole. The connecting sheet 700 is located on the side of the lower insulating member 400 away from the end cover 100, and is electrically connected with the pole 600 and the tab of the battery cell assembly. Among them, the connecting sheet 700 has two, and each connecting sheet 700 is fixedly connected with one pole 600. One connecting sheet 700 is used as a positive connecting sheet, and is electrically connected with the positive pole and the positive tab of the battery cell assembly. The other connecting sheet 700 is used as a negative connecting sheet, and is electrically connected with the negative pole and the negative tab of the battery cell assembly. The upper insulating member 800 is mounted between the pole 600 and the end cover 100. Among them, the upper insulating member 800 has two, and each upper insulating member 800 is mounted between one pole 600 and the end cover 100. One upper insulating member 800 is used as a positive insulating member, and is mounted between the positive pole and the end cover 100. The other upper insulating member 800 is used as a negative insulating member, and is mounted between the negative pole and the end cover 100. The sealing ring 900 is sleeved on the upper insulating member 800, and is clamped between the end cover 100 and the pole 600. Among them, the sealing ring 900 has two, and each sealing ring 900 is sleeved on one upper insulating member 800, and is clamped between the end cover 100 and one pole 600. One sealing ring 900 is used as a positive sealing ring, and is sleeved on the positive insulating member, and is clamped between the end cover 100 and the positive pole. The other sealing ring 900 is used as a negative sealing ring, and is sleeved on the negative insulating member, and is clamped between the end cover 100 and the negative pole.

[0044] Please continue to refer to Figure 6 , Figure 6 is Figure 4 the assembly structure diagram of the end cover 100, the fixing member a, and the insulating tape b in the end cover assembly 3000 shown in

[0045] In this embodiment, the end cover 100 can be an aluminum sheet made of aluminum. The end cover 100 includes a first surface 101, a second surface 102, and a first peripheral side 103. Along the thickness direction of the end cover 100, the second surface 102 and the first surface 101 are oppositely arranged. The first peripheral side 103 is connected between the first surface 101 and the second surface 102.

[0046] The end cover 100 is provided with an explosion-proof hole 110, a first pole hole 120 and a first liquid injection hole 130. The explosion-proof hole 110, the first pole hole 120 and the first liquid injection hole 130 all penetrate the first surface 101 and the second surface 102, and are all arranged apart from the first peripheral 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. The first pole hole 120 is arranged apart from the explosion-proof hole 110 to pass through the pole 600. The first pole hole 120 has two. Along the length direction of the end cover 100, the two first pole holes 120 are respectively located on the opposite sides of the explosion-proof hole 110, and are both arranged apart from the explosion-proof hole 110. One of the first pole holes 120 is for passing through the positive pole. The other of the first pole holes 120 is for passing through the negative pole. The first liquid injection hole 130 is located between the explosion-proof hole 110 and one of the first pole holes 120, and is arranged apart from the explosion-proof hole 110 and the first pole hole 120.

[0047] Please continue to refer to Figure 5 , the explosion-proof valve 200 covers the opening of the explosion-proof hole 110 on the second surface 102. The protective sheet 300 covers the opening of the explosion-proof hole 110 on the first surface 101, and protects the explosion-proof valve 200.

[0048] Please refer to Figure 6 , the fixing member a is arranged on the second surface 102 of the end cover 100, and protrudes from the second surface 102 in a direction away from the first surface 101. Exemplarily, the fixing member a is long strip-shaped. The length direction of the fixing member a is parallel to the width direction of the end cover 100. The fixing member a has two. The two fixing members a are respectively a first fixing member a1 and a second fixing member a2. Along the length direction of the end cover 100, the first fixing member a1 and the second fixing member a2 are respectively located on the opposite sides of the explosion-proof hole 110, and are both arranged apart from the explosion-proof hole 110 to enhance the strength of the end cover 100. In some other embodiments, the fixing member a can be more than three, and the more than three fixing members a are arranged apart along the length direction of the end cover 100.

[0049] In this embodiment, the fixing member a can be an aluminum block made of aluminum, and the fixing member a is installed on the end cover 100 by welding or bonding. In some other embodiments, the fixing member a can be integrally formed with the end cover 100.

[0050] The insulating tape b is pasted on the second surface 102, and is located between the first fixing member a1 and the second fixing member a2. The insulating tape b is provided with a second through hole b1. The second through hole b1 penetrates the insulating tape b along the thickness direction of the insulating tape b, and communicates with the explosion-proof hole 110. By arranging the insulating tape b, the battery cell assembly is insulated from the end cover 100, so as to avoid the battery cell assembly from contacting the end cover 100 to form a short circuit, and improve the safety performance of the energy storage device 1000.

[0051] Referring to Figure 5 and Figure 7 , Figure 7 is Figure 4 a structural diagram of a lower insulating member 400.

[0052] The lower insulating member 400 is located on the side of the second surface 102 away from the first surface 101. The lower insulating member 400 includes a first sub-insulating member 410 and a second sub-insulating member 420. The first sub-insulating member 410 and the second sub-insulating member 420 are spaced apart along the length direction of the end cover assembly 3000 and are respectively located on opposite sides of the explosion-proof hole 110. Specifically, along the length direction of the end cover assembly 3000, the first sub-insulating member 410 is located on the side of the first fixing member a1 away from the explosion-proof hole 110 and is spaced apart from the first fixing member a1, and the second sub-insulating member 420 is located on the side of the second fixing member a2 away from the explosion-proof hole 110 and is spaced apart from the second fixing member a2.

[0053] The first sub-insulating member 410 is provided with a second liquid injection hole 411 and a second pole column hole 412. The second liquid injection hole 411 and the second pole column hole 412 both penetrate the lower insulating member 400 along the thickness direction of the lower insulating member 400. The second liquid injection hole 411 is located on the side of the first fixing member a1 away from the explosion-proof hole 110 and is in communication with the first liquid injection hole 130. The second pole column hole 412 is located on the side of the second liquid injection hole 411 away from the first fixing member a1 and is in communication with one of the first pole column holes 120 for the positive pole column to pass through.

[0054] The second sub-insulating member 420 is provided with a third pole column hole 421. The third pole column hole 421 is located on the side of the second fixing member a2 away from the explosion-proof hole 110, penetrates the lower insulating member 400 along the thickness direction of the lower insulating member 400, and is in communication with one of the first pole column holes 120 for the negative pole column to pass through.

[0055] The clamping block 500 is located on the side of the second surface 102 away from the first surface 101 and is clamped between the lower insulating member 400 and the fixing member a. The clamping block 500 is used to support the end cap 100 and to abut against the cell assembly. Specifically, the clamping block 500 directly abuts against the cell assembly. The clamping block 500 includes a second clamping block surface 501, a first clamping block surface 502, a first side surface 503, and a second side surface 504. The second clamping block surface 501 faces the second surface 102. Along the thickness direction of the end cap assembly 3000, the first clamping block surface 502 is disposed opposite to the second clamping block surface 501 and is located on the side of the fixing member a away from the second surface 102, and is used to abut against the cell assembly. Along the length direction of the end cap assembly 3000, the first side surface 503 and the second side surface 504 are disposed opposite to each other and are both connected between the second clamping block surface 501 and the first clamping block surface 502. The first side 503 abuts against the lower insulating member 400, and the second side 504 abuts against the fixing member a.

[0056] In this embodiment, the length direction of the pressure block 500 is perpendicular to the stacking or winding direction of the electrode sheets in the battery cell assembly, so that within a limited space, the pressure block 500 can press against the battery cell assembly and support the end cap 100 to the greatest extent, and achieve insulation between the end cap 100 and the battery cell assembly. The length direction of the pressure block 500 is parallel to the width direction of the end cap assembly 3000.

[0057] like Figure 1 and Figure 4 As shown, along the width direction of the end cap assembly 3000, the length of the pressure block 500 is d1, the width of the end cap 100 is W1, and the width of the housing 2000 is W2. Where 0.3≤d1 / W1≤1.0 and 0.3≤d1 / W2≤1.0, this ensures that the pressure block 500 has sufficient strength to press against the battery cell assembly in the width direction of the end cap assembly 3000, ensuring good assembly stability of the energy storage device 1000. Along the length direction of the end cap assembly 3000, the width of the pressure block 500 is d2, where d2≥5mm. That is, the distance between the first side 503 and the second side 504 is greater than or equal to 5mm, ensuring that the pressure block 500 has sufficient strength to press against the battery cell assembly.

[0058] The pressure block 500 is provided with a first through hole 510. The first through hole 510 extends through the pressure block 500 along the length direction of the end cap assembly 3000. Multiple first through holes 510 are provided, and these holes are spaced apart along the width direction of the end cap assembly 3000. For example, the first through hole 510 is a rectangular through hole. The cross-sectional area of ​​the first through hole 510 is greater than or equal to 1 cm². 2 This is to ensure good exhaust performance of the energy storage device 1000.

[0059] The first through hole 510 comprises a first hole wall surface 511 and a second hole wall surface 512. The first hole wall surface 511 is located on the side of the second hole wall surface 512 away from the second surface 102, and is spaced apart and opposite to the second hole wall surface 512. The first hole wall surface 511 is located on the side of the first sub-insulating part 410 and the second sub-insulating part 420 away from the end cover 100, and is located on the side of the fixing part a away from the second surface 102, so as to avoid that the first through hole 510 is shielded by the first sub-insulating part 410, the second sub-insulating part 420 and the fixing part a, and to ensure that the gas inside the energy storage device 1000 can flow to the explosion-proof valve 200 through the first through hole 510.

[0060] In the embodiment, the two pressing blocks 500 are respectively a first pressing block 520 and a second pressing block 530. Along the length direction of the end cover assembly 3000, the first pressing block 520 and the second pressing block 530 are respectively located on the opposite sides of the explosion-proof hole 110. Specifically, the first pressing block 520 is located on the side of the first fixing part a1 away from the explosion-proof hole 110, and is located on the side of the first sub-insulating part 410 close to the explosion-proof hole 110, and is clamped between the first sub-insulating part 410 and the first fixing part a1. The second pressing block 530 is located on the side of the second fixing part a2 away from the explosion-proof hole 110, and is located on the side of the second sub-insulating part 420 close to the second fixing part a2, and is clamped between the second sub-insulating part 420 and the second fixing part a2.

[0061] In some other embodiments, the pressing block 500 can be more than three. Along the length direction of the end cover 100, the three pressing blocks 500 are spaced apart, and the fixed connection between the pressing block 500, the end cover 100 and the lower insulating part 400 can be achieved in the clamping form of the embodiment.

[0062] In the embodiment, the pressing block 500 is in a long strip shape. In some other embodiments, the pressing block 500 can be in other polygonal block shapes, or the pressing block 500 can further comprise a connecting pressing block connected between the first pressing block 520 and the second pressing block 530, and the first pressing block 520, the second pressing block 530 and the connecting pressing block together constitute a U-shaped pressing block.

[0063] In the embodiment, the pressing block 500 is made of insulating material, so as to avoid short circuit between the end cover 100 and the battery cell assembly. The melting point of the pressing block 500 is higher than the melting point of the lower insulating part 400. The thermal deformation temperature of the pressing block 500 is greater than or equal to 300°C. For example, the pressing block 500 can be made of ceramic or mica material, which can ensure that the pressing block 500 has good thermal deformation resistance, and the pressing block 500 can still not deform in a high temperature environment, and always supports the end cover 100 and abuts against the battery cell assembly, so as to avoid short circuit and fire between the battery cell assembly and the end cover 100, and to improve the safety performance of the energy storage device 1000.

[0064] Along the thickness direction of the end cover assembly 3000, one pole post 600 is arranged in one first pole post hole 120 and the second pole post hole 412. Another pole post 600 is arranged in another first pole post hole 120 and the third pole post hole 421. One connecting piece 700 is arranged on the side of the first sub-insulating piece 410 away from the end cover 100 and is fixedly connected with one pole post 600. Another connecting piece 700 is arranged on the side of the second sub-insulating piece 420 away from the end cover 100 and is fixedly connected with another pole post 600. One upper insulating piece 800 is arranged around one pole post 600 and is arranged in one first pole post hole 120 and the second pole post hole 412. Another upper insulating piece 800 is arranged around another pole post 600 and is arranged in another first pole post hole 120 and the third pole post hole 421. One sealing ring 900 is arranged on one upper insulating piece 800 and is arranged in one first pole post hole 120 and the second pole post hole 412 and is clamped between the second surface 102 of the end cover 100 and the surface of one pole post 600 close to the end cover 100. Another sealing ring 900 is arranged on another upper insulating piece 800 and is arranged in another first pole post hole 120 and the third pole post hole 421 and is clamped between the second surface 102 of the end cover 100 and the surface of another pole post 600 close to the end cover 100. The arrangement of the sealing rings 900 not only seals the gap between the upper insulating pieces 800 and the lower insulating pieces 400, guarantees the good air tightness of the end cover assembly 3000, but also insulates the end cover 100 and the pole posts 600.

[0065] Please refer to Figures 8 to 10 , Figure 8 is Figure 1 the structure schematic diagram of the end cover assembly 3000 in the second embodiment of the energy storage device 1000 shown in FIG. 8, Figure 9 is Figure 8 the structure schematic diagram of the baffle c in the end cover assembly 3000 shown in FIG. 9 from another angle, Figure 10 is Figure 8 the sectional structure schematic diagram of the end cover assembly 3000 along B-B shown in FIG. 10.

[0066] The difference between the embodiment and the first embodiment is that the end cover assembly 3000 further comprises a baffle c mounted on the side of the first pressing block 520 and the second pressing block 530 away from the end cover 100 and abutting against the battery cell assembly. The pressing block 500 indirectly abuts against the battery cell assembly through the baffle c. Specifically, the baffle c comprises a third surface 1, a fourth surface 2 and a second peripheral side surface 3. The third surface 1 is the surface of the baffle c away from the second surface 102 and is used to abut against the battery cell assembly. The fourth surface 2 is arranged opposite to the third surface 1 along the thickness direction of the baffle c and abuts against the first pressing block surface 502 of the pressing block 500. The distance between the third surface 1 and the fourth surface 2 is greater than or equal to 0.5 mm and less than or equal to 1 mm, which ensures that the baffle c has a certain thickness to insulate the end cover 100 and the battery cell assembly and does not occupy too much internal space of the energy storage device 1000. The second peripheral side surface 3 is connected between the third surface 1 and the fourth surface 2.

[0067] The baffle c is provided with a third through hole 4. The third through hole 4 penetrates the baffle c along the thickness direction of the baffle c and is in communication with the explosion-proof hole 110 and is arranged in a spaced manner with the second peripheral side surface 3. The high-pressure and high-temperature gas generated inside the energy storage device 1000 can be discharged to the explosion-proof valve 200 through the third through hole 4, which ensures the exhaust performance of the energy storage device 1000. The third through hole 4 is provided in a plurality of forms and is arranged in a spaced manner. For example, the third through hole 4 is in the form of a rectangle. The length direction of the third through hole 4 is parallel to the length direction of the end cover assembly 3000.

[0068] The baffle c is further provided with a first protrusion 5 and a second protrusion 6. The first protrusion 5 and the second protrusion 6 are both protruded from the fourth surface 2 away from the third surface 1 and are both located between the fourth surface 2 and the second hole wall surface 512, so as to avoid that the first through hole 510 is completely blocked by the first protrusion 5 and the second protrusion 6 and to ensure that the gas inside the energy storage device 1000 can flow to the explosion-proof valve 200 through the first through hole 510. Specifically, the first protrusion 5 is located on the side of the first pressing block 520 away from the second pressing block 530. The second protrusion 6 is located on the side of the second pressing block 530 away from the first pressing block 520 and clamps the first pressing block 520 and the second pressing block 530 together with the first protrusion 5, so as to realize the assembly between the baffle c and the first pressing block 520 and the second pressing block 530.

[0069] Specifically, the first protrusion 5 comprises a first protrusion surface 51 and a third side surface 52. The first protrusion surface 51 is located on the side of the fourth surface 2 away from the third surface 1 and is located between the fourth surface 2 and the second hole wall surface 512 and is arranged in a spaced and opposite manner with the first sub-insulating part 410. The third side surface 52 is connected between the first protrusion surface 51 and the fourth surface 2 and abuts against the first side surface 503 of the first pressing block 520.

[0070] The second protrusion 6 comprises a second protrusion surface 61 and a fourth side surface 62. The second protrusion surface 61 is located on the side of the fourth surface 2 away from the third surface 1, and is located between the fourth surface 2 and the second hole wall surface 512, and is spaced apart from and opposite to the second sub-insulating part 420. The fourth side surface 62 is connected between the second protrusion surface 61 and the fourth surface 2, and abuts against the first side surface 503 of the second pressing block 530.

[0071] In the embodiment, the baffle c is made of an insulating material to avoid short circuiting between the end cover 100 and the battery cell assembly. The thermal deformation temperature of the baffle c is greater than or equal to 300°C. For example, the baffle c can be made of ceramic or mica, which can ensure that the pressing block 500 has good thermal deformation resistance. The pressing block 500 can still not deform in a high-temperature environment, and always supports the end cover 100 and abuts against the battery cell assembly, thereby avoiding short circuiting and fire caused by contact between the battery cell assembly and the end cover 100, and improving the safety performance of the energy storage device 1000.

[0072] Please refer to Figure 11 , Figure 11 is Figure 1 the structural schematic diagram of the end cover assembly 3000 in the third embodiment of the energy storage device 1000 shown in FIG. 8.

[0073] The difference between the embodiment and the second embodiment is that the baffle c is located on the side of the first fixing part a1 and the second fixing part a2 away from the end cover 100, and is clamped between the first pressing block 520 and the second pressing block 530. Specifically, the baffle c is clamped between the second side surface 504 of the first pressing block 520 and the second side surface 504 of the second pressing block 530, realizing the assembly of the baffle c, the pressing block 500 and the fixing part a, avoiding direct contact between the battery cell assembly and the end cover 100, and further improving the safety performance of the energy storage device 1000. In addition, the third surface 1 of the baffle c is located between the first hole wall surface 511 and the fixing part a, so as to avoid that the first through hole 510 is blocked by the baffle c, to ensure that the gas in the energy storage device 1000 can flow to the explosion-proof valve 200 through the first through hole 510, facilitating the gas in the energy storage device 1000 to be discharged from the first through hole 510, and ensuring the exhaust performance of the energy storage device 1000.

[0074] In some other embodiments, different from the second embodiment, the baffle c is made of polypheylene ether (PPE). The baffle c is provided with clamping structures at four corners thereof, and the clamping structures at the four corners of the baffle c clamp the first pressing block 520 and the second pressing block 530 to realize the assembly between the baffle c and the first pressing block 520 and the second pressing block 530. In this way, a gap is left between the two long sides of the baffle c and the pressing block 500, so as to prevent the baffle c from blocking the first through hole 510 after melting of the baffle c due to thermal runaway of the energy storage device 1000, and facilitate the exhaust of the energy storage device 1000, thereby ensuring the exhaust performance of the energy storage device 1000.

[0075] The energy storage device 1000 provided by the embodiments can limit the movement of the battery cell assembly inside the energy storage device 1000 by arranging the pressing block 500 in the end cover assembly 3000, which abuts against the battery cell assembly. Meanwhile, the pressing block 500 is made of an insulating material, which can avoid the short circuit between the end cover 100 and the battery cell assembly. The thermal deformation temperature of the pressing block 500 is greater than or equal to 300°C, which can ensure that the pressing block 500 has good thermal deformation resistance, and the pressing block 500 can still not deform under a high-temperature environment, and always supports the end cover 100 and abuts against the battery cell assembly, preventing the battery cell assembly from moving to the direction of the end cover 100 and blocking the explosion-proof valve 200, avoiding the short circuit and fire caused by the contact between the end cover 100 and the battery cell assembly, and improving the safety performance of the energy storage device 1000. In addition, the gas inside the energy storage device 1000 can be discharged to the explosion-proof valve 200 through the first through hole 510 of the pressing block 500, and then discharged after the explosion-proof valve 200 is opened, thereby ensuring the good exhaust performance of the energy storage device 1000.

[0076] The application also provides a power utilization device, such as an energy storage cabinet, a new energy vehicle, etc. The power utilization device comprises the energy storage device 1000 in the above embodiments. Since the specific structure and technical effects of the energy storage device 1000 have been described in detail in the foregoing, no further description is given here. The power utilization device provided by the embodiments can improve the exhaust performance and use safety and reliability of the power utilization device by arranging the energy storage device 1000.

[0077] The above description is only optional embodiments of the application, and the above embodiments are only used to help understand the core idea of the application, and do not limit the patent scope of the application; meanwhile, for those skilled in the art, according to the inventive concept of the application, equivalent structural transformation is made by using the application specification and drawings, or direct / indirect application in other related technical fields, which are also included in the patent protection scope of the application.

Claims

1. An end cap assembly, characterized by, The end cover includes a first surface and a second surface, the second surface and the first surface are oppositely arranged along the thickness direction of the end cover, the end cover is provided with an explosion-proof hole penetrating through the first surface and the second surface; The explosion-proof valve is installed on the end cover and covers the explosion-proof hole; The first pressing block, the second pressing block and the lower insulation piece are located on the side of the second surface away from the first surface, the first pressing block is located on one side of the explosion-proof hole and is spaced apart from the explosion-proof hole, the first pressing block is used for supporting the end cover and abutting against the battery cell assembly, wherein the first pressing block is made of insulating material, the melting point of the first pressing block is higher than the melting point of the lower insulation piece, the second pressing block is located on the side of the explosion-proof hole away from the first pressing block and is spaced apart from the explosion-proof hole; The lower insulation piece includes a first sub-insulation piece and a second sub-insulation piece, along the length direction of the end cover assembly, the first sub-insulation piece is located on the side of the first pressing block away from the explosion-proof hole, and the second sub-insulation piece is located on the side of the second pressing block away from the explosion-proof hole; The first fixing piece is arranged on the second surface and located on the side of the first pressing block away from the first sub-insulation piece and spaced apart from the explosion-proof hole, and the first fixing piece and the first sub-insulation piece jointly clamp and fix the first pressing block, and the second fixing piece is located on the side of the second pressing block close to the explosion-proof hole and spaced apart from the explosion-proof hole, and the second fixing piece and the second sub-insulation piece jointly clamp and fix the second pressing block.

2. The end cap assembly of claim 1, wherein, The first pressing block is provided with a first through hole penetrating through the first pressing block along the length direction of the end cover assembly.

3. The end cap assembly of claim 2, wherein, The cross-sectional area of the first through hole is greater than or equal to 1 cm 2 .

4. An end cap assembly according to claim 2 or 3, wherein, The first pressing block is provided with a plurality of first through holes arranged in the width direction of the end cover assembly.

5. The end cap assembly of claim 1, wherein, The thermal deformation temperature of the first pressing block is greater than or equal to 300 DEG C.

6. The end cap assembly of claim 1, wherein, The first pressing block includes a first pressing block surface away from the second surface, and the first fixing piece is located between the second surface and the first pressing block surface.

7. The end cap assembly of claim 1, wherein, The end cover assembly further includes an insulating tape, the insulating tape is pasted on the second surface and located between the first fixing piece and the second fixing piece, the insulating tape is provided with a second through hole penetrating through the insulating tape along the thickness direction of the insulating tape and in communication with the explosion-proof hole.

8. The end cap assembly of claim 1, wherein, The end cover assembly further includes a baffle installed on the side of the first fixing piece and the second fixing piece away from the end cover.

9. The end cap assembly of claim 1, wherein, The end cover assembly further includes a baffle installed on the side of the first pressing block and the second pressing block away from the end cover, the baffle includes a third surface and a fourth surface, the third surface is the surface of the baffle away from the second surface and is used for abutting against the battery cell assembly, along the thickness direction of the baffle, the fourth surface is oppositely arranged with the third surface and abuts against the pressing block; The baffle is provided with a first protrusion and a second protrusion, both of which are arranged on the fourth surface, the first protrusion is located on the side of the first pressing block away from the second pressing block, and the second protrusion is located on the side of the second pressing block away from the first pressing block and clamps the first pressing block and the second pressing block together with the first protrusion.

10. An end cap assembly according to claim 8 or 9, wherein, The baffle is further provided with a third through hole penetrating through the baffle along the thickness direction of the baffle and communicating with the explosion-proof hole.

11. The end cap assembly of claim 10, wherein, The width of the first pressing block is greater than or equal to 5 mm.

12. An energy storage device, characterized by The energy storage device comprises a shell, an electric core assembly and the end cover assembly as claimed in any one of claims 1-11, 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 communicates with the receiving cavity, the electric core assembly is received in the receiving cavity, the end cover assembly is installed on the shell and seals the opening and is electrically connected with the electric core assembly, wherein the first pressing block abuts against the electric core assembly.

13. An electrical device, characterized by The energy storage device as claimed in claim 12 is used to supply power to the electric device.

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