End cover assembly, energy storage device and electric equipment

Abstract

According to the end cover assembly, the energy storage device and the electric equipment, the risk of short circuit of the energy storage device is reduced, and the safety performance of the energy storage device is improved. The end cover assembly comprises an end cover, an anti-explosion valve, a first pressing block, a lower insulating part and a first fixing part, the end cover comprises a first surface and a second surface which are arranged oppositely, the end cover is provided with an anti-explosion hole, and the anti-explosion hole penetrates through the first surface and the second surface; the anti-explosion valve is installed on the end cover and covers an opening, located in the second surface, of the anti-explosion hole. The first pressing block and the lower insulating part are both 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 used for supporting the end cover and abutting against the battery cell assembly, and the melting point of the first pressing block is higher than that of the lower insulating part; the lower insulating part comprises a first sub-insulating part, the first sub-insulating part is located on the side, away from the explosion-proof hole, of the first pressing block, the first fixing part is arranged on the second surface and located on the side, away from the first sub-insulating part, of the first pressing block, and the first fixing part and the first sub-insulating part jointly clamp the first pressing block.

Description

Technical Field

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

[0002] As energy storage devices are increasingly used, their safety performance has attracted much attention. When energy storage devices are in thermal runaway, they will generate a large amount of high-temperature gas. When the high-temperature gas is discharged through the explosion-proof valve, the lower insulation will melt, causing the lower plastic to lose its limiting effect on the battery cell assembly. The battery cell assembly will come into direct contact with the end cover, causing a short circuit and sparks, which will cause fire and explosion, posing a huge safety hazard. Summary of the invention

[0003] The present application provides an end cover assembly, an energy storage device, and electrical equipment, which reduce the risk of short circuit in the energy storage device and improve the safety performance of the energy storage device.

[0004] The present application provides an end cap assembly, comprising an end cap, an explosion-proof valve, a first pressure block, a lower insulating member and a first fixing member, wherein the end cap comprises a first surface and a second surface, wherein the second surface and the first surface are arranged opposite to each other in the thickness direction of the end cap, and the end cap is provided with an explosion-proof hole, wherein the explosion-proof hole passes through the first surface and the second surface;

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

[0006] The first pressing block and the lower insulating member are both located on a 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 to support the end cover and to abut against the battery cell assembly, wherein the first pressing block is made of an insulating material, and the melting point of the first pressing block is higher than the melting point of the lower insulating member;

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

[0008] The first fixing member is disposed on the second surface and is located at a side of the first pressing block away from the first sub-insulating member, and is spaced apart from the explosion-proof hole, and clamps and fixes the first pressing block together with the first sub-insulating member.

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

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

[0011] There are a plurality of the first through holes, and the plurality of the first through holes are arranged at intervals along the width direction of the end cover assembly.

[0012] Wherein, the end cover assembly further includes 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 spaced apart from 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 spaced apart from the explosion-proof hole;

[0013] The lower insulating member also includes a second sub-insulating member. Along the length direction of the end cover assembly, the second sub-insulating member is located on a side of the second pressing block away from the explosion-proof hole, and clamps and fixes the second pressing block together with the second fixing member.

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

[0015] The first pressing block includes 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] Wherein, the end cover assembly also includes an insulating tape, which is adhered to the second surface and located between the first fixing member and the second fixing member. The insulating tape is provided with a second through hole, which penetrates the insulating tape along the thickness direction of the insulating tape and is connected to the explosion-proof hole.

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

[0018] Wherein, the end cover assembly further comprises a baffle, which is mounted on a side of the first pressing block and the second pressing block away from the end cover, and the baffle comprises a third surface and a fourth surface, the third surface is a surface of the baffle away from the second surface and is used to abut against the battery cell assembly, and along the thickness direction of the baffle, the fourth surface is arranged opposite to the third surface 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 provided on the fourth surface, the first protrusion is located on the side of the first pressure block away from the second pressure block, the second protrusion is located on the side of the second pressure block away from the first pressure block, and together with the first protrusion, clamps the first pressure block and the second pressure block.

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

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

[0022] The present application also provides an energy storage device, which includes a shell, a battery cell assembly and any of the above-mentioned end cover assemblies, 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, wherein the first pressure block abuts against the battery cell assembly.

[0023] 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.

[0024] The end cap assembly, energy storage device and electrical equipment provided by the present application are provided with a pressing block in the end cap assembly, and the pressing block presses the battery cell assembly to limit the movement of the battery cell assembly inside the energy storage device. At the same time, the pressing block is made of insulating material to avoid short circuit caused by contact between the end cap and the battery cell assembly. The thermal deformation temperature of the pressing block is greater than or equal to 300°C, which can ensure that the pressing block has good resistance to thermal deformation. The pressing block can still not deform in a high temperature environment, and always supports the end cap and abuts the battery cell assembly to prevent the battery cell assembly from moving in the direction of the end cap and blocking the explosion-proof valve, avoiding short circuit and fire caused by contact between the end cap and the battery cell assembly, thereby improving the safety performance of the energy storage device. In addition, the gas inside the energy storage device can be discharged to the explosion-proof valve through the first through hole of the pressing block, and then discharged after the explosion-proof valve is opened, ensuring good exhaust performance of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present application, the drawings required for the implementation of the present application will be described below.

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

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

[0028] Figure 3 yes Figure 2 A schematic diagram of the structure of the end cover assembly shown at another angle;

[0029] Figure 4 yes Figure 2 An exploded structural diagram of the end cap assembly shown;

[0030] Figure 5 yes Figure 3The structure schematic diagram of the end cover assembly after being cut along AA;

[0031] Figure 6 yes Figure 4 A schematic diagram of the assembly structure of the end cap, the fixing member and the insulating tape in the end cap assembly shown;

[0032] Figure 7 yes Figure 4 A schematic diagram of the structure of the lower insulating member shown;

[0033] Figure 8 yes Figure 1 A schematic structural diagram of an end cover assembly in the energy storage device shown in the second embodiment;

[0034] Fig. 9 yes Figure 8 A schematic diagram of the structure of the baffle in the end cover assembly shown at another angle;

[0035] Fig.10 yes Figure 8 The cross-sectional structure diagram of the end cover assembly after being cut along BB;

[0036] Fig.11 yes Figure 1 A schematic structural diagram of the end cover assembly in the energy storage device shown in the third embodiment.

[0037] Figure numerals: 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 peripheral side surface 103, explosion-proof hole 110, first pole hole 120, first injection hole 130, first fixing member a1, second fixing member a2, second through hole b1, first sub-insulating member 4 10, second sub-insulator 420, second injection hole 411, second pole hole 412, third pole hole 421, second pressing block surface 501, first pressing block surface 502, first side surface 503, second side surface 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 peripheral side surface 3, third through hole 4, first protrusion 5, second protrusion 6, first protrusion surface 51, third side surface 52, second protrusion surface 61, fourth side surface 62. 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 It is a schematic diagram of the structure of the energy storage device 1000 provided in this application.

[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 present application may be, but is not limited to, the listed products, and may also be other application forms. The present application does not impose strict restrictions on the application form of the energy storage device 1000. 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 (not shown) and an end cover assembly 3000. The shell 2000 is provided with a receiving cavity (not shown) and an opening 2001. The receiving cavity is located on the inner side of the shell 2000 and contains an electrolyte. The opening 2001 is located on the top side of the receiving cavity and is connected to the receiving cavity. Among them, 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 immersed in the electrolyte. The end cover assembly 3000 is installed on the shell 2000, closes the opening 2001, and is electrically connected to the battery cell assembly.

[0042] See also Figures 2 to 5 , Figure 2 yes Figure 1 The schematic diagram of the structure of the end cover assembly 3000 of the energy storage device 1000 in the first embodiment is shown. Figure 3 yes Figure 2 The schematic diagram of the structure of the end cover assembly 3000 at another angle is shown. Figure 4 yes Figure 2 The exploded structural diagram of the end cap assembly 3000 is shown in FIG. Figure 5 yes Figure 3 The structure diagram of the end cover assembly 3000 after being cut open along AA is shown.

[0043] In this embodiment, the end cap assembly 3000 includes an end cap 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 cap 100. Along the thickness direction of the end cap 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 cap 100. Along the thickness direction of the end cap assembly 3000, the pole 600 passes through the end cap 100 and the lower insulating member 400. Among them, there are two poles 600, and the two poles 600 are arranged at intervals along the length direction of the end cap assembly 3000. One pole 600 is used as a positive pole, and the other pole 600 is used as a negative pole. The connecting piece 700 is located on the side of the lower insulating member 400 away from the end cover 100, and is electrically connected to the pole 600 and the pole ear of the battery cell assembly. Among them, there are two connecting pieces 700, and each connecting piece 700 is fixedly connected to a pole 600. One connecting piece 700 is used as a positive electrode connecting piece, and is electrically connected to the positive pole column and the positive pole ear of the battery cell assembly. Another connecting piece 700 is used as a negative electrode connecting piece, and is electrically connected to the negative pole column and the negative pole ear of the battery cell assembly. The upper insulating member 800 is installed between the pole 600 and the end cover 100. Among them, there are two upper insulating members 800, and each upper insulating member 800 is installed between a pole 600 and the end cover 100. One upper insulating member 800 is used as a positive pole insulating member and is installed between the positive pole column and the end cover 100. Another upper insulating member 800 is used as a negative pole insulating member and is installed between the negative pole column and the end cover 100. The sealing ring 900 is sleeved on the upper insulating member 800 and clamped between the end cap 100 and the pole 600. There are two sealing rings 900, each of which is sleeved on an upper insulating member 800 and clamped between the end cap 100 and a pole 600. One sealing ring 900 is used as a positive electrode sealing ring, and is sleeved on the positive electrode insulating member and clamped between the end cap 100 and the positive pole. The other sealing ring 900 is used as a negative electrode sealing ring, and is sleeved on the negative electrode insulating member and clamped between the end cap 100 and the negative pole.

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

[0045] In this embodiment, the end cap 100 can be a plain aluminum sheet made of aluminum. The end cap 100 includes a first surface 101, a second surface 102 and a first peripheral side surface 103. Along the thickness direction of the end cap 100, the second surface 102 and the first surface 101 are arranged opposite to each other. The first peripheral side surface 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 spaced apart from the first 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. The first pole hole 120 is spaced apart from the explosion-proof hole 110 to allow the pole 600 to pass through. Among them, there are two first pole holes 120. Along the length direction of the end cover 100, the two first pole holes 120 are respectively located on opposite sides of the explosion-proof hole 110, and are both set with the explosion-proof hole 110. One first pole hole 120 is for the positive pole to pass through. The other first pole hole 120 is for the negative pole to pass through. The first liquid injection hole 130 is located between the explosion-proof hole 110 and a first pole hole 120 , and is spaced apart from both the explosion-proof hole 110 and the first pole hole 120 .

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

[0048] Please also read Figure 6 , the fixing member a is disposed 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 in the shape of an elongated strip. The length direction of the fixing member a is parallel to the width direction of the end cover 100. There are two fixing members a. 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 opposite sides of the explosion-proof hole 110, and are both spaced apart from the explosion-proof hole 110 to enhance the strength of the end cover 100. In some other embodiments, there may be more than three fixing members a, and the more than three fixing members a are spaced 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 mounted on the end cover 100 by welding or bonding. In some other embodiments, the fixing member a can also be integrally formed with the end cover 100.

[0050] The insulating tape b is attached to 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 is connected to the explosion-proof hole 110. By providing the insulating tape b, the battery cell assembly is insulated from the end cover 100, so as to avoid the battery cell assembly and the end cover 100 from contacting to form a short circuit, thereby improving the safety performance of the energy storage device 1000.

[0051] See also Figure 5 and Figure 7 , Figure 7 yes Figure 4 A schematic structural diagram of the lower insulating member 400 is shown.

[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-insulator 410 and a second sub-insulator 420. Along the length direction of the end cap assembly 3000, the first sub-insulator 410 and the second sub-insulator 420 are spaced apart and respectively located on opposite sides of the explosion-proof hole 110. Specifically, along the length direction of the end cap assembly 3000, the first sub-insulator 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-insulator 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-insulator 410 is provided with a second injection hole 411 and a second pole hole 412. The second injection hole 411 and the second pole hole 412 both penetrate the lower insulating member 400 along the thickness direction of the lower insulating member 400. The second injection hole 411 is located on the side of the first fixing member a1 away from the explosion-proof hole 110, and is connected to the first injection hole 130. The second pole hole 412 is located on the side of the second injection hole 411 away from the first fixing member a1, and is connected to a first pole hole 120 for the positive pole to pass through.

[0054] The second sub-insulator 420 is provided with a third pole hole 421. The third pole 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 communicates with a first pole hole 120 for the negative pole to pass through.

[0055] The pressing 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 pressing block 500 is used to support the end cover 100 and to abut the battery cell assembly. Among them, the pressing block 500 directly abuts the battery cell assembly. The pressing block 500 includes a second pressing block surface 501, a first pressing block surface 502, a first side 503 and a second side 504. The second pressing block surface 501 faces the second surface 102. Along the thickness direction of the end cover assembly 3000, the first pressing block surface 502 is arranged opposite to the second pressing 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 the battery cell assembly. Along the length direction of the end cover assembly 3000, the first side 503 and the second side 504 are arranged opposite to each other, and are both connected between the second pressing block surface 501 and the first pressing block surface 502. The first side surface 503 abuts against the lower insulating member 400 , and the second side surface 504 abuts against the fixing member a.

[0056] In this embodiment, the length direction of the pressing block 500 is perpendicular to the lamination direction or winding direction of the pole pieces in the battery cell assembly, so that the pressing block 500 can press the battery cell assembly and support the end cap 100 to the greatest extent in a limited space, and achieve insulation between the end cap 100 and the battery cell assembly. The length direction of the pressing 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 pressing block 500 is d1, the width of the end cap 100 is W1, and the width of the shell 2000 is W2. Among them, 0.3≤d1 / W1≤1.0, 0.3≤d1 / W2≤1.0, ensure that the pressing block 500 has sufficient strength to press the battery cell assembly in the width direction of the end cap assembly 3000, and ensure that the energy storage device 1000 has good assembly stability. Along the length direction of the end cap assembly 3000, the width of the pressing block 500 is d2, d2≥5mm. That is, the distance between the first side surface 503 and the second side surface 504 is greater than or equal to 5mm, ensuring that the pressing block 500 has sufficient strength to abut the battery cell assembly.

[0058] The pressing block 500 is provided with a first through hole 510. The first through hole 510 penetrates the pressing block 500 along the length direction of the end cap assembly 3000. There are a plurality of first through holes 510, and the plurality of first through holes 510 are arranged at intervals along the width direction of the end cap assembly 3000. Exemplarily, 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 cm 2 , to ensure good exhaust performance of the energy storage device 1000.

[0059] The first through hole 510 includes 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 and arranged opposite to the second hole wall surface 512. The first hole wall surface 511 is located on the side of the first sub-insulator 410 and the second sub-insulator 420 away from the end cover 100, and is located on the side of the fixing member a away from the second surface 102, so as to avoid the first through hole 510 being blocked by the first sub-insulator 410, the second sub-insulator 420 and the fixing member a, and 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 this embodiment, there are two pressing blocks 500, which are respectively a first pressing block 520 and a second pressing block 530. Along the length direction of the end cap assembly 3000, the first pressing block 520 and the second pressing block 530 are respectively located on opposite sides of the explosion-proof hole 110. Specifically, the first pressing block 520 is located on the side of the first fixing member a1 away from the explosion-proof hole 110, and is located on the side of the first sub-insulating member 410 close to the explosion-proof hole 110, and is clamped between the first sub-insulating member 410 and the first fixing member a1. The second pressing block 530 is located on the side of the second fixing member a2 away from the explosion-proof hole 110, and is located on the side of the second sub-insulating member 420 close to the second fixing member a2, and is clamped between the second sub-insulating member 420 and the second fixing member a2.

[0061] In some other embodiments, there may be more than three pressing blocks 500. Along the length direction of the end cover 100, three pressing blocks 500 are arranged at intervals, and the fixed connection between the pressing blocks 500, the end cover 100 and the lower insulating member 400 can be achieved by referring to the clamping form of this embodiment.

[0062] In this embodiment, the pressing block 500 is in the shape of a long strip. In other embodiments, the pressing block 500 may be in other polygonal block shapes, or the pressing block 500 may further include 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 this embodiment, the pressing block 500 is made of insulating material to avoid short circuit between the end cap 100 and the battery cell assembly. The melting point of the pressing block 500 is higher than the melting point of the lower insulating member 400. The thermal deformation temperature of the pressing block 500 is greater than or equal to 300°C. Exemplarily, the pressing block 500 can be made of ceramic or mica material, which can ensure that the pressing block 500 has good resistance to thermal deformation. The pressing block 500 can still not deform in a high temperature environment, and always support the end cap 100 and abut the battery cell assembly to avoid short circuit and fire caused by contact between the battery cell assembly and the end cap 100, thereby improving the safety performance of the energy storage device 1000.

[0064] Along the thickness direction of the end cap assembly 3000, one pole 600 is provided in a first pole hole 120 and a second pole hole 412. Another pole 600 is provided in another first pole hole 120 and a third pole hole 421. A connecting piece 700 is located on a side of the first sub-insulator 410 away from the end cap 100, and is fixedly connected to one pole 600. Another connecting piece 700 is located on a side of the second sub-insulator 420 away from the end cap 100, and is fixedly connected to another pole 600. An upper insulator 800 is provided around one pole 600, and is provided in a first pole hole 120 and a second pole hole 412. Another upper insulator 800 is provided around another pole 600, and is provided in another first pole hole 120 and a third pole hole 421. A sealing ring 900 is sleeved on an upper insulating member 800, and is inserted into a first pole hole 120 and a second pole hole 412, and is clamped between the second surface 102 of the end cover 100 and the surface of a pole 600 close to the end cover 100. Another sealing ring 900 is sleeved on another upper insulating member 800, and is inserted into another first pole hole 120 and a third pole hole 421, and is clamped between the second surface 102 of the end cover 100 and the surface of another pole 600 close to the end cover 100. The provision of the sealing ring 900 can not only seal the gap between the upper insulating member 800 and the lower insulating member 400, ensuring good airtightness of the end cover assembly 3000, but also insulate the end cover 100 from the pole 600.

[0065] See also Figures 8 to 10 , Figure 8 yes Figure 1 The schematic diagram of the structure of the end cover assembly 3000 in the energy storage device 1000 in the second embodiment is shown. Fig. 9 yes Figure 8 The structure diagram of the baffle c in the end cover assembly 3000 shown in FIG. 3 is shown in FIG. 3 from another angle. Fig.10 yes Figure 8 The cross-sectional structure diagram of the end cover assembly 3000 after being cut along BB is shown.

[0066] The difference between this embodiment and the first embodiment is that the end cap assembly 3000 also includes a baffle c, which is installed on the side of the first pressing block 520 and the second pressing block 530 away from the end cap 100, and presses the battery cell assembly. Among them, the pressing block 500 indirectly presses the battery cell assembly through the baffle c. Specifically, the baffle c includes 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 the battery cell assembly. Along the thickness direction of the baffle c, the fourth surface 2 is arranged opposite to the third surface 1, 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 0.5mm and less than or equal to 1mm, ensuring that the baffle c has a certain thickness to insulate the end cap 100 and the battery cell assembly, while not occupying 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 plate c is provided with a third through hole 4. The third through hole 4 penetrates the baffle plate c along the thickness direction of the baffle plate c, is connected to the explosion-proof hole 110, and is spaced apart from 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, thereby ensuring the exhaust performance of the energy storage device 1000. There are multiple third through holes 4, and multiple third through holes 4 are spaced apart. Exemplarily, the third through hole 4 is rectangular. 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 also provided with a first protrusion 5 and a second protrusion 6. The first protrusion 5 and the second protrusion 6 both protrude from the fourth surface 2 in a direction away from the third surface 1, and are both located between the fourth surface 2 and the second hole wall 512, so as to avoid the first through hole 510 being 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 together with the first protrusion 5, clamps the first pressing block 520 and the second pressing block 530, 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 includes a first protrusion surface 51 and a third side surface 52. The first protrusion surface 51 is located on a 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 and arranged opposite to the first sub-insulator 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 includes 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 512, and is spaced and arranged opposite to the second sub-insulator 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 this embodiment, the baffle c is made of insulating material to avoid short circuit between the end cap 100 and the battery cell assembly. The thermal deformation temperature of the baffle c is greater than or equal to 300°C. Exemplarily, 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 cap 100 and abuts the battery cell assembly to avoid short circuit and fire caused by contact between the battery cell assembly and the end cap 100, thereby improving the safety performance of the energy storage device 1000.

[0072] See also Fig.11 , Fig.11 yes Figure 1 The structure diagram of the end cover assembly 3000 in the energy storage device 1000 is shown in the third embodiment.

[0073] The difference between this embodiment and the second embodiment is that the baffle c is located on the side of the first fixing member a1 and the second fixing member 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, so as to realize the assembly between the baffle c, the pressing block 500 and the fixing member a, avoid direct contact between the battery cell assembly and the end cover 100, and further improve 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 511 and the fixing member a to avoid the first through hole 510 being blocked by the baffle c, so as 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, so as to facilitate the gas inside the energy storage device 1000 to be discharged from the first through hole 510, and ensure the exhaust performance of the energy storage device 1000.

[0074] In some other embodiments, different from the second embodiment, the baffle c can be made of polyphenylene ether plastic (PPE). Clamping structures are provided at the four corners of the baffle c, 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. There are gaps between the long sides of the baffle c and the pressing block 500 to prevent the baffle c from melting and blocking the first through hole 510 when the energy storage device 1000 is in thermal runaway, which is beneficial to the exhaust of the energy storage device 1000 and ensures the exhaust performance of the energy storage device 1000.

[0075] The energy storage device 1000 provided in this embodiment is provided with a pressing block 500 in the end cover assembly 3000. The pressing block 500 presses against the battery cell assembly to limit the movement of the battery cell assembly inside the energy storage device 1000. At the same time, the pressing block 500 is made of insulating material to prevent the end cover 100 from short-circuiting with 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. The pressing block 500 can still remain unchanged in a high temperature environment, and always supports the end cover 100 and abuts against the battery cell assembly to prevent the battery cell assembly from moving toward the end cover 100 and blocking the explosion-proof valve 200, thereby preventing the end cover 100 from contacting the battery cell assembly to cause a short circuit and fire, thereby 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 good exhaust performance of the energy storage device 1000.

[0076] The present application 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.

[0077] The above is only an optional implementation mode of the present application. The description of the above implementation mode 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 a person 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. An end cap assembly, characterized in that: The device comprises an end cover, an explosion-proof valve, a first pressing block, a lower insulating member and a first fixing member, wherein the end cover comprises a first surface and a second surface, and along the thickness direction of the end cover, the second surface and the first surface are arranged opposite to each other, and the end cover is provided with an explosion-proof hole, and the explosion-proof hole passes 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 and the lower insulating member are both located on a 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 to support the end cover and to abut against the battery cell assembly, wherein the first pressing block is made of an insulating material, and the melting point of the first pressing block is higher than the melting point of the lower insulating member; The lower insulating member comprises a first sub-insulating member, and along the length direction of the end cover assembly, the first sub-insulating member is located on a side of the first pressing block away from the explosion-proof hole; The first fixing member is disposed on the second surface and is located on a side of the first pressing block away from the first sub-insulating member, and is spaced apart from the explosion-proof hole, and clamps and fixes the first pressing block together with the first sub-insulating member.

2. The end cap assembly according to claim 1, characterized in that: The first pressing block is provided with a first through hole, and the first through hole penetrates the first pressing block along the length direction of the end cover assembly.

3. The end cap assembly according to claim 2, characterized in that: The cross-sectional area of ​​the first through hole is greater than or equal to 1 cm 2 .

4. The end cap assembly according to claim 2 or 3, characterized in that: There are a plurality of the first through holes, and the plurality of the first through holes are arranged at intervals along the width direction of the end cover assembly.

5. The end cap assembly according to any one of claims 1 to 3, characterized in that: The end cover assembly further includes a second pressing block and a second fixing member, wherein the second pressing block is located on a side of the explosion-proof hole away from the first pressing block and is spaced apart from 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 spaced apart from the explosion-proof hole; The lower insulating member also includes a second sub-insulating member. Along the length direction of the end cover assembly, the second sub-insulating member is located on a side of the second pressing block away from the explosion-proof hole, and clamps and fixes the second pressing block together with the second fixing member.

6. The end cap assembly according to claim 1, characterized in that: The thermal deformation temperature of the first pressing block is greater than or equal to 300°C.

7. The end cap assembly according to claim 1, characterized in that: 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.

8. The end cap assembly according to claim 5, characterized in that: The end cover assembly also includes an insulating tape, which is adhered to the second surface and located between the first fixing member and the second fixing member. The insulating tape is provided with a second through hole, which penetrates the insulating tape along the thickness direction of the insulating tape and is connected to the explosion-proof hole.

9. The end cap assembly according to claim 5, characterized in that: The end cover assembly further includes a baffle, which is mounted on a side of the first fixing member and the second fixing member away from the end cover.

10. The end cap assembly according to claim 5, characterized in that: The end cap assembly further includes a baffle, which is mounted on a side of the first pressing block and the second pressing block away from the end cap, and includes a third surface and a fourth surface, wherein the third surface is a surface of the baffle away from the second surface and is used to abut against the battery cell assembly, and along the thickness direction of the baffle, the fourth surface is disposed opposite to the third surface and abuts against the pressing block; The baffle is provided with a first protrusion and a second protrusion, the first protrusion and the second protrusion are both provided on the fourth surface, the first protrusion is located on the side of the first pressure block away from the second pressure block, the second protrusion is located on the side of the second pressure block away from the first pressure block, and together with the first protrusion, clamps the first pressure block and the second pressure block.

11. The end cap assembly according to claim 9 or 10, characterized in that: The baffle plate is further provided with a third through hole, and the third through hole penetrates the baffle plate along the thickness direction of the baffle plate and is communicated with the explosion-proof hole.

12. The end cap assembly according to claim 11, characterized in that The width of the first pressing block is greater than or equal to 5 mm.

13. 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 any one of claims 1 to 12, 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, wherein the first pressure block abuts against the battery cell assembly.

14. An electrical device, characterized in that: It includes the energy storage device as described in claim 13, and the energy storage device is used to supply power to the electrical equipment.

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