Lower insulation assembly, end cover assembly, energy storage device and electric equipment

Abstract

According to the lower insulation assembly, the end cover assembly, the energy storage device and the electric equipment, good exhaust performance of the energy storage device is guaranteed, and the safety performance of the energy storage device is improved. The lower insulating assembly comprises a lower insulating part and a supporting block, the lower insulating part comprises a first surface and a second surface, and the second surface and the first surface are arranged oppositely in the thickness direction of the lower insulating part; the lower insulating part is provided with a boss, and the boss is arranged on the second surface, protrudes from the second surface to the direction away from the first surface, and abuts against the electrode assembly. The lower insulating part is further provided with a groove, an opening of the groove is located in the first surface, and the groove is recessed from the first surface to the boss. The supporting block is installed in the groove, and the melting point of the supporting block is larger than that of the lower insulating part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a lower insulation assembly, 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, the internal temperature is too high, the lower insulation part is easy to melt, at the same time, the energy storage device will rapidly produce gas to drive the electrode assembly to move towards the end cover, so that the lower plastic is further deformed to block the exhaust passage inside the energy storage device, resulting in that the exhaust speed of the energy storage device is less than the gas production speed, causing the explosion of the energy storage device and bringing great safety hazard, reducing the safety and reliability of the energy storage device. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a lower insulation assembly, an end cover assembly, an energy storage device and an electric equipment, which ensures the good exhaust performance of the energy storage device and improves the safety performance of the energy storage device.

[0004] The present application provides a lower insulation assembly used in an energy storage device, comprising a lower insulation part and a support block, the lower insulation part comprises a first surface and a second surface, the second surface and the first surface are oppositely arranged along the thickness direction of the lower insulation part;

[0005] The lower insulation part is provided with a boss, the boss is arranged on the second surface and protrudes away from the first surface, and is used for pressing the electrode assembly of the energy storage device;

[0006] The lower insulation part is also provided with a groove, the opening of the groove is located on the first surface, and the groove is recessed from the first surface to the direction of the boss;

[0007] The support block is mounted in the groove, and the melting point of the support block is greater than the melting point of the lower insulation part.

[0008] Among them, the boss, the groove and the support block are two, two bosses are arranged at intervals along the length direction of the lower insulation part, two grooves are arranged at intervals, and are respectively arranged corresponding to two bosses, and two support blocks are respectively mounted in two grooves.

[0009] Among them, the boss comprises a first side and a second side, the first side and the second side are oppositely arranged;

[0010] The groove comprises a first groove side wall and a second groove side wall, the first groove side wall is oppositely arranged with the first side, the second groove side wall is oppositely arranged with the first groove side wall along the length direction of the lower insulation part, and is oppositely arranged with the second side.

[0011] The lower insulation piece is further provided with a first through hole and a second through hole, the first through hole penetrating the first slot side wall surface and the first side surface, and the second through hole penetrating the second slot side wall surface and the second side surface;

[0012] The support block is provided with a ventilation hole penetrating the support block along the width direction of the support block, and communicating with the groove, the first through hole and the second through hole.

[0013] The first side surface is provided with a hot melting point for hot melting connection with a Mylar film of an energy storage device, and the hot melting point is arranged at intervals with the first through hole along the width direction of the lower insulation piece.

[0014] The first through hole and the second through hole are both multiple, and multiple first through holes are arranged at intervals and multiple second through holes are arranged at intervals along the width direction of the lower insulation piece.

[0015] The groove includes multiple first sub-grooves, and multiple first sub-grooves are arranged at intervals along the width direction of the lower insulation piece, wherein the first through hole and the second through hole are arranged on the slot side wall of the first sub-groove.

[0016] The support block includes a support base and multiple support protrusions, the support base includes a third surface and a fourth surface, the third surface has the same orientation as the first surface, and the fourth surface is arranged opposite to the third surface along the thickness direction of the support block.

[0017] Multiple support protrusions are arranged on the fourth surface and arranged at intervals along the width direction of the lower insulation piece, and respectively installed in multiple first sub-grooves.

[0018] The ventilation hole penetrates the support protrusion and communicates with the first sub-groove.

[0019] The groove further includes multiple second sub-grooves, and multiple second sub-grooves and multiple first sub-grooves are arranged alternately along the width direction of the lower insulation piece, wherein the groove bottom wall surface of the second sub-groove is arranged opposite to the fourth surface.

[0020] The lower insulation piece is further provided with a first notch and a second notch, the first notch and the second notch are arranged on the slot side wall of the second sub-groove, the first notch penetrates the first slot side wall surface, the first side surface and the first surface, and the second notch penetrates the second slot side wall surface and the second side surface.

[0021] The lower insulating member is further provided with a third through hole, which is located on the bottom wall of the second sub-groove and penetrates the bottom wall of the second sub-groove.

[0022] The third surface is flush with the first surface, or the third surface is located on the side of the first surface facing the second surface.

[0023] This application also provides an end cap assembly, including the lower insulation component, end cap and explosion-proof valve described in any one of the above, wherein the lower insulation component is further provided with a vent hole, the vent hole penetrating the first surface and the second surface and being spaced apart from the boss;

[0024] The end cap is located on the side of the first surface away from the second surface, and the end cap is provided with an explosion-proof hole, which is arranged opposite to the vent hole;

[0025] The explosion-proof valve is installed on the end cap and covers the explosion-proof hole.

[0026] This application also provides an energy storage device, which includes a housing, an electrode assembly, and the aforementioned end cap assembly. 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 electrode assembly is received in the receiving cavity. The end cap assembly is installed on the housing, closes the opening, and is electrically connected to the electrode assembly. The boss abuts against the electrode assembly.

[0027] The energy storage device further includes a Mylar membrane, which is housed in the receiving cavity and located between the housing and the electrode assembly, and encapsulates the electrode assembly, and is also connected to the lower insulating member.

[0028] This application also provides an electrical device including the above-described energy storage device, which is used to supply power to the electrical device.

[0029] The lower insulation component, end cap component, energy storage device, and electrical equipment provided in this application form the lower insulation component by setting a support block in the lower insulation component. The melting point of the support block is higher than that of the lower insulation component, so that the support block can always support the end cap and press against the electrode component in a high-temperature environment, restrict the movement of the electrode component inside the energy storage device, prevent the electrode component from blocking the internal exhaust channel when the energy storage device is thermally runaway, ensure the rapid discharge of gas inside the energy storage device, and improve the exhaust performance and safety performance of the energy storage device. Attached Figure Description

[0030] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0031] Figure 1 is a schematic diagram of the energy storage device structure provided by the present application;

[0032] Figure 2 is Figure 1 is a schematic diagram of the exploded structure of the energy storage device shown in

[0033] Figure 3 is Figure 1 is another schematic diagram of the exploded structure of the energy storage device shown in

[0034] Figure 4 is Figure 3 is a schematic diagram of the exploded structure of the end cap assembly in the energy storage device shown in

[0035] Figure 5 is Figure 3 is a schematic diagram of the cross-sectional structure of the end cap assembly shown in along the section A-A;

[0036] Figure 6 is Figure 4 is a schematic diagram of the lower insulation assembly in the end cap assembly shown in

[0037] Figure 7 is Figure 6 is a schematic diagram of the exploded structure of the lower insulation assembly shown in

[0038] Figure 8 is Figure 7 is a schematic diagram of the lower insulation member in the lower insulation assembly shown in at another angle;

[0039] Figure 9 is Figure 7 is a schematic diagram of the support block in the lower insulation assembly shown in at another angle;

[0040] Figure 10 is Figure 6 is a schematic diagram of the cross-sectional structure of the lower insulation assembly shown in along the section B-B.

[0041] Reference numerals: Energy storage device 1000, housing 2000, electrode assembly 3000, end cap assembly 4000, Mylar membrane 5000, receiving cavity 2001, opening 2002, hot melt zone a1, lower insulation assembly 100, end cap 200, explosion-proof valve 300, protective plate 400, pole post 500, upper insulation component 600, sealing ring 700, lower insulation component 110, support block 120, first surface 111, second surface 112, first peripheral side 113, boss 114, boss surface 114a, boss side 114b, first side 114c, second side 114d, hot melt point a2, vent hole 115, first pole post hole 1 16. First injection hole 117, groove 118, first through hole 119a, second through hole 119b, first notch 119c, second notch 119d, third through hole 119e, bottom wall of the tank 118a, first side wall of the tank 118b, second side wall of the tank 118c, third side wall of the tank 118d, sub-groove b, first sub-groove b1, second sub-groove b2, partition c, support base 123, support protrusion 124, third surface 121, fourth surface 122, vent hole 125, fifth surface 201, sixth surface 202, second peripheral side 203, explosion-proof hole 210, second pole hole 220, second injection hole 230. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the energy storage device 1000 provided in this application. Figure 2 yes Figure 1 The exploded structural diagram of the energy storage device 1000 shown is as follows. Figure 3 yes Figure 1 Another exploded structural diagram of the energy storage device 1000 shown.

[0044] This application provides an energy storage device 1000, which may include, but is not limited to, single-cell batteries, battery modules, battery packs, and battery systems. The actual application of the energy storage device provided in this application may be, but is not limited to, the products listed, or other application forms. This application does not strictly limit the application form of the energy storage device 1000. This application uses a square battery as an example for illustration.

[0045] The energy storage device 1000 comprises a shell 2000, an electrode assembly 3000, an end cover assembly 4000 and a Mylar film 5000. The shell 2000 is provided with a receiving cavity 2001 and an opening 2002. The receiving cavity 2001 is located at the inner side of the shell 2000 and contains electrolyte. The opening 2002 is located at the top side of the receiving cavity 2001 and communicates with the receiving cavity 2001. The shell 2000 can be made of aluminum, for example, the shell 2000 can be an aluminum shell. The electrode assembly is received in the receiving cavity 2001. The electrode assembly can be soaked in the electrolyte. The end cover assembly 4000 is installed on the shell 2000 and seals the opening 2002, and is electrically connected with the electrode assembly 3000. The Mylar film 5000 is received in the receiving cavity 2001 and located between the shell 2000 and the electrode assembly 3000, and wraps the electrode assembly 3000, and is connected with the end cover assembly 4000. The Mylar film 5000 is provided with a hot melting area a1, and the hot melting area a1 can be two, and the two hot melting areas a1 are located at the two side surfaces of the Mylar film 5000 along the length direction of the energy storage device 1000. The Mylar film 5000 can be connected with the end cover assembly 4000 by hot melting at the hot melting area a1 to isolate the shell 2000 and the electrode assembly 3000.

[0046] Please refer to Figure 4 and Figure 5 , Figure 4 is Figure 3 the exploded structural schematic view of the end cover assembly 4000 in the energy storage device 1000 shown in FIG. 1, Figure 5 is Figure 3 the cross-sectional structural schematic view of the end cover assembly along A-A.

[0047] In this embodiment, the end cover assembly 4000 includes the lower insulating assembly 100, the end cover 200, the explosion-proof valve 300, the protective sheet 400, the pole 500, the upper insulating member 600 and the sealing ring 700. The end cover 200 is installed on one side of the lower insulating assembly 100 along the thickness direction of the end cover assembly 4000. The explosion-proof valve 300 and the protective sheet 400 are both installed on the end cover 200. The pole 500 passes through the end cover 200 and the lower insulating assembly 100. Among them, the pole 500 has two, and the two poles 500 are arranged at intervals along the length direction of the end cover assembly 4000. One pole 500 is used as a positive pole, and the other pole 500 is used as a negative pole. The upper insulating member 600 is installed between the pole 500 and the end cover 200. Among them, the upper insulating member 600 has two, and each upper insulating member 600 is installed between one pole 500 and the end cover 200. One upper insulating member 600 is used as a positive insulating member and is installed between the positive pole and the end cover 200. The other upper insulating member 600 is used as a negative insulating member and is installed between the negative pole and the end cover 200. The sealing ring 700 is sleeved on the upper insulating member 600 and clamped between the end cover 200 and the pole 500. Among them, the sealing ring 700 has two, and each sealing ring 700 is sleeved on one upper insulating member 600 and clamped between the end cover 200 and one pole 500. One sealing ring 700 is used as a positive sealing ring and is sleeved on the positive insulating member and clamped between the end cover 200 and the positive pole. The other sealing ring 700 is used as a negative sealing ring and is sleeved on the negative insulating member and clamped between the end cover 200 and the negative pole.

[0048] Please continue to refer to Figures 6 to 8 , Figure 6 is Figure 4 the structure diagram of the lower insulating assembly 100 in the end cover assembly 4000 shown in FIG. 4, Figure 7 is Figure 6 the exploded structure diagram of the lower insulating assembly 100 shown in FIG. 5, Figure 8 is Figure 7 the structure diagram of the lower insulating member 110 in the lower insulating assembly 100 shown in FIG. 6 at another angle.

[0049] The lower insulating assembly 100 includes the lower insulating member 110 and the support block 120. The lower insulating member 110 can be connected with the Mylar film 5000. The support block 120 is installed on the lower insulating member 110. The lower insulating member 110 includes the first surface 111, the second surface 112 and the first peripheral side 113. The second surface 112 and the first surface 111 are oppositely arranged along the thickness direction of the lower insulating member 110. The first peripheral side 113 is connected between the first surface 111 and the second surface 112.

[0050] The lower insulating member 110 is provided with a boss 114. The boss 114 is arranged on the second surface 112. The boss 114 protrudes away from the first surface 111 from the second surface 112. The boss 114 includes a boss surface 114a and a boss side surface 114b. The boss surface 114a is located on the side of the second surface 112 away from the first surface 111, and abuts against the electrode assembly 3000. The boss side surface 114b is arranged around the boss surface 114a, and is connected between the boss surface 114a and the second surface 112. The boss side surface 114b includes a first side surface 114c and a second side surface 114d. The first side surface 114c is arranged opposite to the second side surface 114d along the length direction of the lower insulating member 110. The first side surface 114c is provided with a hot melting point a2. The hot melting point a2 is located in the middle of the first side surface 114c along the width direction of the lower insulating member 110. The lower insulating member 110 can be connected to the hot melting area a1 of the Mylar film 5000 by hot melting at the hot melting point a2. The boss 114 is in the shape of a strip, and the length direction of the boss 114 is parallel to the width direction of the lower insulating member 110. In this embodiment, there are two bosses 114, and the two bosses 114 are arranged at opposite ends of the lower insulating member 110 along the length direction of the lower insulating member 110.

[0051] The boss 114 limits the electrode assembly 3000, which can fix the electrode assembly 3000, avoid the tab tearing or the core loosening caused by the shaking of the electrode assembly 3000, reduce the influence of the movement of the electrode assembly 3000 along the thickness direction of the lower insulating member 110 in the energy storage device 1000, improve the stability of the internal structure of the energy storage device 1000, and improve the safety performance and use reliability of the energy storage device 1000.

[0052] The lower insulating member 110 is also provided with a gas permeable hole 115, a first pole hole 116, a first liquid injection hole 117, a groove 118, a first through hole 119a, a second through hole 119b, a first notch 119c, a second notch 119d, and a third through hole 119e. The gas permeable hole 115, the first pole hole 116, and the first liquid injection hole 117 all penetrate the lower insulating member 110 along the thickness direction of the lower insulating member 110. The gas permeable hole 115 is located in the middle of the lower insulating member 110 along the length direction of the lower insulating member 110, and is arranged between the two bosses 114 and spaced apart from the two bosses 114. The first pole hole 116 is located between the gas permeable hole 115 and the boss 114. There are two first pole holes 116. One first pole hole 116 is located between the gas permeable hole 115 and one boss 114. The other first pole hole 116 is located between the gas permeable hole 115 and the other boss 114. The first liquid injection hole 117 is located between one first pole hole 116 and the gas permeable hole 115, and is spaced apart from the first pole hole 116 and the gas permeable hole 115.

[0053] The recess 118 is located on the side of the first pole hole 116 away from the air hole 115 and is arranged at the position corresponding to the boss 114 of the lower insulating piece 110. The opening of the recess 118 is located on the first surface 111. The recess 118 is recessed from the first surface 111 to the boss 114, and is spaced apart from the first peripheral side surface 113 and the boss side surface 114b. The recess 118 includes a groove bottom wall surface 118a, a first groove side wall surface 118b, a second groove side wall surface 118c, and two third groove side wall surfaces 118d. The groove bottom wall surface 118a is arranged opposite to the opening of the recess 118 and is located between the boss surface 114a and the second surface 112. The first groove side wall surface 118b and the second groove side wall surface 118c are arranged opposite to each other and are connected between the groove bottom wall surface 118a and the first surface 111. The first groove side wall surface 118b is arranged away from the first side surface 114c. The second groove side wall surface 118c is located on the side of the first groove side wall surface 118b close to the air hole 115 and is arranged away from the second side surface 114d. The two third groove side wall surfaces 118d are connected between the first groove side wall surface 118b and the second groove side wall surface 118c. Among them, there are two recesses 118, and the two recesses 118 are arranged corresponding to the two bosses 114 respectively. One recess 118 is located on the side of one first pole hole 116 away from the air hole 115. The other recess 118 is located on the side of the other first pole hole 116 away from the air hole 115. Exemplarily, the recess 118 is in the shape of a long strip, and the length direction of the recess 118 is parallel to the width direction of the lower insulating piece 110.

[0054] Each recess 118 includes a plurality of sub-recesses b, and the plurality of sub-recesses b are spaced apart along the width direction of the lower insulating piece 110. The plurality of sub-recesses b include a plurality of first sub-recesses b1 and a plurality of second sub-recesses b2. Along the width direction of the lower insulating piece 110, the plurality of first sub-recesses b1 are spaced apart, the plurality of second sub-recesses b2 are spaced apart, and the plurality of first sub-recesses b1 and the plurality of second sub-recesses b2 are arranged alternately.

[0055] The first through hole 119a and the second through hole 119b are arranged on the groove side wall of the first sub-recess b1. Specifically, the first through hole 119a is arranged on the groove side wall of the first sub-recess b1 away from the air hole 115 and penetrates the first groove side wall surface 118b and the first side surface 114c along the wall thickness direction of the first sub-recess b1, and communicates with the first sub-recess b1. Among them, the first through hole 119a can be multiple. The plurality of first through holes 119a are spaced apart. In addition, the first through hole 119a is spaced apart from the heat melting point a2 of the first side surface 114c to avoid affecting the connection between the Mylar film 5000 and the lower insulating piece 110, thereby improving the assembly stability of the energy storage device 1000. Exemplarily, the first through hole 119a is a circular hole.

[0056] The second through hole 119b is arranged on the groove side wall of the first sub-groove b1 close to the air hole 115, penetrates the second groove side wall surface 118c and the second side surface 114d along the wall thickness direction of the first sub-groove b1, and communicates with the first sub-groove b1. The second through hole 119b can be multiple. The multiple second through holes 119b are arranged at intervals. For example, the second through hole 119b can be a circular hole or a square hole.

[0057] The first notch 119c and the second notch 119d are arranged on the groove side wall of the second sub-groove b2. Specifically, the first notch 119c is arranged on the groove side wall of the second sub-groove b2 away from the air hole 115, penetrates the first groove side wall surface 118b and the first side surface 114c along the wall thickness direction of the second sub-groove b2, communicates with the second sub-groove b2, and penetrates the first surface 111 along the thickness direction of the lower insulating piece 110. The first notch 119c can be multiple. The multiple first notches 119c are arranged at intervals. In addition, the first notch 119c is arranged at an interval from the heat melting point a2 of the first side surface 114c, so as to avoid the influence of the first notch 119c on the connection between the Mylar film 5000 and the lower insulating piece 110, and improve the assembly stability of the energy storage device 1000. For example, the first notch 119c is a square notch, so as to facilitate the installation and cooperation between the lower insulating piece 110 and the support block 120.

[0058] The second notch 119d is arranged on the groove side wall of the second sub-groove b2 close to the air hole 115, penetrates the second groove side wall surface 118c and the second side surface 114d along the wall thickness direction of the second sub-groove b2, and communicates with the second sub-groove b2. The first notch 119c can be multiple, and the multiple second notches 119d are arranged at intervals. For example, the second notch 119d is a square notch.

[0059] The third through hole 119e is arranged on the groove bottom wall of the second sub-groove b2, and penetrates the groove bottom wall along the wall thickness direction of the second sub-groove b2. Specifically, the third through hole 119e penetrates the groove bottom wall surface 118a and the boss surface 114a, and communicates with the second sub-groove b2. The third through hole 119e can be multiple. The multiple third through holes 119e are arranged at intervals and are arranged at intervals from the boss side surface 114b. In this embodiment, the multiple third through holes 119e are also arranged on the groove bottom wall of the first sub-groove b1, and penetrate the groove bottom wall of the first sub-groove b1 along the wall thickness direction of the first sub-groove b1. For example, the third through hole 119e is a circular hole.

[0060] In the embodiment, by setting the first through hole 119a, the second through hole 119b, the first notch 119c, the second notch 119d and the third through hole 119e, it is ensured that the gas generated inside the energy storage device 1000 can quickly flow to the explosion-proof valve 300, so that the explosion-proof valve 300 opens in time. Specifically, when the energy storage device 1000 is in thermal runaway, the gas generated inside the energy storage device 1000 enters the first sub-groove b1 from the first through hole 119a or the third through hole 119e of the first sub-groove b1, and then flows to the area below the explosion-proof valve 300 through the second through hole 119b. The gas can also enter the second sub-groove b2 from the first notch 119c or the third through hole 119e of the second sub-groove b2, and then flow to the area below the explosion-proof valve 300 through the second notch 119d, which is beneficial to the timely pressure relief of the explosion-proof valve 300 and improves the exhaust performance of the energy storage device 1000.

[0061] In the embodiment, the groove bottom wall surface 118a of each first groove can be provided with a partition plate c. The partition plate c is installed in the groove 118 and connected between the first groove side wall surface 118b and the second groove side wall surface 118c, and also located between the groove bottom wall surface 118a and the first surface 111. The partition plate c has a plurality of partition plates c. The plurality of partition plates c are arranged in the width direction of the lower insulation member 110 and divide the groove 118 into a plurality of sub-grooves b.

[0062] Please refer to Figure 5 、 Figure 9 and Figure 10 , Figure 9 is Figure 7 the structure diagram of the support block 120 in the lower insulation assembly 100 from another angle, Figure 10 is Figure 6 the cross-sectional structure diagram of the lower insulation assembly 100 along the B-B section.

[0063] The support block 120 is installed in the groove 118 of the lower insulation member 110. Exemplarily, the support block 120 is in a strip shape, and the length direction of the support block 120 is parallel to the width direction of the lower insulation member 110. The length of the support block 120 is L, and the length of the groove 118 is W. Wherein, L=W, the groove 118 can limit the movement of the support block 120 in the width direction of the end cover assembly 4000, ensure the assembly stability between the support block 120 and the lower insulation member 110, so that the lower insulation assembly 100 can better press the electrode assembly 3000, and improve the safety performance of the energy storage device 1000.

[0064] The support block 120 comprises a support base 123 and a support protrusion 124. The support base 123 is installed in the groove 118 and abuts against the partition c. The support base 123 comprises a third surface 121 and a fourth surface 122. The third surface 121 is located on the side of the first surface 111 facing the second surface 112 and has the same orientation as the first surface 111. In some other embodiments, the third surface can be flush with the first surface 111 to facilitate the assembly between the lower insulation assembly 100 and the end cover 200 and ensure the assembly stability of the energy storage device 1000. The fourth surface 122 is located opposite to the third surface 121 along the thickness direction of the lower insulation assembly 100. The fourth surface 122 abuts against the partition c and is located opposite to the groove bottom wall surface 118a of the second sub-groove b2.

[0065] The support protrusion 124 is arranged on the fourth surface 122 and protrudes away from the third surface 121. Specifically, the support protrusion 124 is installed in the first sub-groove b1 and located between the support base 123 and the groove bottom wall surface 118a. The support protrusion 124 has a plurality of support protrusions. The plurality of support protrusions 124 are arranged at intervals along the length direction of the support block 120. Each support protrusion 124 is installed in a first sub-groove b1. The assembly of the support protrusion 124 of the support block 120 and the first sub-groove b1 can increase the assembly stability between the support block 120 and the lower insulation piece 110, so that the lower insulation assembly 100 can better abut against the electrode assembly 3000. Meanwhile, the support protrusion 124 is only installed in the first sub-groove b1, which can ensure that the second sub-groove b2 has sufficient exhaust space, which is conducive to the entry of the gas from the first gap 119c or the third through hole 119e of the second sub-groove b2 into the second sub-groove b2, the exhaust of the gas from the second gap 119d to the lower side of the explosion-proof valve 300, the improvement of the exhaust efficiency of the lower insulation piece 110, and the improvement of the safety performance of the energy storage device 1000. In some other embodiments, the support protrusion 124 can also be installed in the second sub-groove b2, or a part of the support protrusions 124 are installed in the first sub-groove b1 and the other part of the support protrusions 124 are installed in the second sub-groove b2.

[0066] The support block 120 is provided with a ventilation hole 125. The ventilation hole 125 penetrates the support block 120 along the width direction of the support block 120 and communicates with the groove 118, the first through hole 119a and the second through hole 119b. Specifically, the ventilation hole 125 penetrates the support base 123 and the support protrusion 124 along the width direction of the support block 120 and communicates with the first sub-groove b1. The ventilation hole 125 has a plurality of ventilation holes, and the plurality of ventilation holes 125 are arranged at intervals along the length direction of the support block 120.

[0067] By setting the vent hole 125, it is ensured that the gas generated inside the energy storage device 1000 during thermal runaway can be quickly discharged to the area below the explosion-proof valve 300. Specifically, the gas generated inside the energy storage device 1000 can first enter the first sub-groove b1 through the first through hole 119a, and then flow from the vent hole 125 to the second through hole 119b, and then flow to the gas permeable hole 115 area in the middle of the lower insulating piece 110, and can also first enter the second sub-groove b2 through the first gap 119c and the third through hole 119e, and then flow to the gas permeable hole 115 area in the middle of the lower insulating piece 110 through the second gap 119d, which is conducive to the discharge of the gas from the explosion-proof valve 300, and improves the exhaust performance and safety performance of the energy storage device 1000.

[0068] In the embodiment, the support base 123 is integrally formed with the plurality of support protrusions 124, which reduces the number of parts of the end cover assembly 4000 and facilitates improving the assembly efficiency of the end cover assembly 4000.

[0069] In the embodiment, the support block 120 is made of an insulating material to avoid short-circuiting of the end cover 200 and the electrode assembly 3000. The thermal deformation temperature of the support block 120 is greater than the thermal deformation temperature of the lower insulating piece 110. The melting point of the support block 120 is greater than the melting points of the lower insulating piece 110, the positive electrode sheet (aluminum material), and the negative electrode sheet (aluminum material). For example, the melting point of the support block 120 is greater than or equal to 600°C. In the embodiment, the support block 120 can be made of ceramic or mica material to ensure that the support block 120 has good thermal deformation resistance and a high melting point, so that the support block 120 can still not deform and melt in a high-temperature environment, and always supports the end cover 200 and presses the electrode assembly 3000, ensuring that the energy storage device 1000 has good exhaust performance and improving the safety performance of the energy storage device 1000.

[0070] Please continue to refer to Figure 5 The end cover 200 can be an aluminum sheet made of aluminum. The end cover 200 is located on the side of the first surface 111 away from the second surface 112. The end cover 200 includes a fifth surface 201, a sixth surface 202, and a second peripheral side surface 203. The fifth surface 201 is a surface of the end cover 200 away from the lower insulating piece 110. The sixth surface 202 and the fifth surface 201 are oppositely arranged along the thickness direction of the end cover 200. The second peripheral side surface 203 is connected between the fifth surface 201 and the sixth surface 202.

[0071] The end cover 200 is provided with an explosion-proof hole 210, a second pole hole 220 and a second liquid injection hole 230. The explosion-proof hole 210, the second pole hole 220 and the second liquid injection hole 230 all penetrate the end cover 200 along the thickness direction of the end cover 200, and are all arranged in a spaced manner with the second peripheral side surface 203. Along the length direction of the end cover 200, the explosion-proof hole 210 is located in the middle of the end cover 200, and is arranged in a spaced manner with the air hole 115. It should be noted that the explosion-proof hole 210 is arranged in a spaced manner with the air hole 115 means that the orthographic projection of the explosion-proof hole 210 on the lower insulating piece 110 at least partially covers the air hole 115. The second pole hole 220 is arranged in a spaced manner with the explosion-proof hole 210, and is in communication with the first pole hole 116, so as to pass the pole 500. The second pole hole 220 has two. Along the length direction of the end cover 200, the two second pole holes 220 are respectively located on the two sides of the explosion-proof hole 210, and are respectively in communication with the two first pole holes 116. Specifically, one second pole hole 220 is in communication with one first pole hole 116, so as to pass the positive pole. The other second pole hole 220 is in communication with the other first pole hole 116, so as to pass the negative pole. The second liquid injection hole 230 is located between the explosion-proof hole 210 and one second pole hole 220, and is arranged in a spaced manner with the explosion-proof hole 210 and the second pole hole 220, and is in communication with the first liquid injection hole 117.

[0072] Please continue to refer to Figure 5 The explosion-proof valve 300 covers the opening of the explosion-proof hole 210 located on the sixth surface 202. The protective sheet 400 covers the opening of the explosion-proof hole 210 located on the fifth surface 201, and protects the explosion-proof valve 300.

[0073] Along the thickness direction of the end cover assembly 4000, each pole 500 passes through one second pole hole 220 and one first pole hole 116. Each upper insulating piece 600 is arranged around one pole 500, and passes through one second pole hole 220 and one first pole hole 116. Each sealing ring 700 is sleeved on one upper insulating piece 600, and passes through one second pole hole 220 and one first pole hole 116, and is clamped between the sixth surface 202 of the end cover 200 and the surface of one pole 500 close to the end cover 200. Not only can the sealing ring 700 seal the gap between the upper insulating piece 600 and the lower insulating piece 110, so as to ensure the good air tightness of the end cover assembly 4000, but also can insulate the end cover 200 and the pole 500.

[0074] The energy storage device 1000 provided by the embodiment comprises a lower insulation assembly 100 formed by arranging the support block 120 in the lower insulation member 110, and the thermal deformation temperature of the support block 120 is greater than the thermal deformation temperature of the lower insulation member 110, and the melting point of the support block 120 is higher than the melting points of the lower insulation member 110, the positive electrode sheet (aluminum material) and the negative electrode sheet (aluminum material), so that the support block 120 can always support the end cover 200 and the electrode assembly 3000 under high temperature environment, limit the movement of the electrode assembly 3000 inside the energy storage device 1000, and prevent the electrode assembly 3000 from blocking the internal exhaust passage when the energy storage device 1000 is out of control.

[0075] At the same time, the gas inside the energy storage device 1000 can be discharged to the gas permeable hole 115 through the first through hole 119a, the gas hole 125 and the second through hole 119b in turn, and can also enter the second sub-groove b2 through the first gap 119c and the third through hole 119e of the second sub-groove b2, and then be discharged to the gas permeable hole 115 through the second gap 119d, and then be discharged from the explosion-proof valve 300 after the explosion-proof valve 300 is opened, which is beneficial to the rapid discharge of the gas inside the energy storage device 1000, and improves the exhaust performance and safety 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 and the like. The power utilization device comprises 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 in the foregoing, they will not be described here. The power utilization device provided by the embodiment improves the exhaust performance and use safety and reliability of the power utilization device by arranging the energy storage device 1000.

[0077] The above is only an optional embodiment of the application, and the description of the above embodiment is only used to help understand the core idea of the application, and does not limit the patent scope of the application; at the same time, for those skilled in the art, according to the 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 is also included in the patent protection scope of the application.

Claims

1. A lower insulating assembly for use in an energy storage device, characterized by, The lower insulating piece comprises a first surface and a second surface, and the second surface is opposite to the first surface along the thickness direction of the lower insulating piece; The lower insulating piece is provided with a boss, the boss is arranged on the second surface and protrudes away from the first surface, and is used for pressing the electrode assembly of the energy storage device; The lower insulating piece is also provided with a groove, the opening of the groove is located on the first surface, and the groove is recessed from the first surface to the boss; The support block is installed in the groove, and the melting point of the support block is higher than that of the lower insulating piece.

2. The lower insulating assembly of claim 1, wherein, The boss, the groove and the support block are all two, two bosses are arranged in the length direction of the lower insulating piece, two grooves are arranged in the length direction of the lower insulating piece and correspond to the two bosses respectively, and two support blocks are installed in the two grooves respectively.

3. The lower insulating assembly according to claim 1 or 2, characterized in that The boss comprises a first side and a second side, and the first side is opposite to the second side; The groove comprises a first groove side wall and a second groove side wall, the first groove side wall is opposite to the first side, the second groove side wall is opposite to the first groove side wall along the length direction of the lower insulating piece, and the second groove side wall is opposite to the second side; The lower insulating piece is also provided with a first through hole and a second through hole, the first through hole penetrates the first groove side wall and the first side, and the second through hole penetrates the second groove side wall and the second side; The support block is provided with a ventilation hole, the ventilation hole penetrates the support block along the width direction of the support block, and is in communication with the groove, the first through hole and the second through hole.

4. The lower insulating assembly of claim 3, wherein, The first side is provided with a thermal melting point, the thermal melting point is used for thermal melting connection with the Mylar film of the energy storage device, and the thermal melting point is arranged in the width direction of the lower insulating piece and is spaced from the first through hole.

5. The lower insulating assembly of claim 3, wherein, The first through hole and the second through hole are all multiple, multiple first through holes are arranged in the width direction of the lower insulating piece, and multiple second through holes are arranged in the width direction of the lower insulating piece; The groove comprises multiple first sub-grooves, multiple first sub-grooves are arranged in the width direction of the lower insulating piece, wherein the first through hole and the second through hole are arranged on the groove side wall of the first sub-groove; The support block comprises a support base and multiple support protrusions, the support base comprises a third surface and a fourth surface, the third surface is the same as the first surface in the direction, and the fourth surface is opposite to the third surface along the thickness direction of the support block; Multiple support protrusions are arranged on the fourth surface and are arranged in the width direction of the lower insulating piece, and are installed in multiple first sub-grooves respectively; The ventilation hole penetrates the support protrusion and is in communication with the first sub-groove.

6. The lower insulating assembly of claim 5, wherein, The groove also comprises multiple second sub-grooves, multiple second sub-grooves and multiple first sub-grooves are arranged alternately in the width direction of the lower insulating piece, wherein the groove bottom wall of the second sub-groove is opposite to the fourth surface; The lower insulation piece is further provided with a first notch and a second notch, both of which are arranged on the groove side wall of the second sub-groove, the first notch penetrates the first groove side wall surface, the first side surface and the first surface, and the second notch penetrates the second groove side wall surface and the second side surface.

7. The lower insulating assembly of claim 6, wherein, The lower insulation piece is further provided with a third through hole, which is arranged on the groove bottom wall of the second sub-groove and penetrates the groove bottom wall of the second sub-groove.

8. The lower insulating assembly according to any one of claims 5 to 7, characterized in that, The third surface is flush with the first surface, or the third surface is located on the side of the first surface facing the second surface.

9. An end cap assembly characterized by, The lower insulation piece is further provided with a gas permeable hole, which penetrates the first surface and the second surface and is arranged in a spaced manner with the boss; The end cover is located on the side of the first surface away from the second surface, and is provided with an explosion-proof hole arranged in a spaced manner with the gas permeable hole; The explosion-proof valve is installed on the end cover and covers the explosion-proof hole.

10. An energy storage device, characterized by, The energy storage device comprises a shell, an electrode assembly and an end cover assembly as claimed in claim 9, 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 electrode assembly is contained in the receiving cavity, the end cover assembly is installed on the shell and seals the opening and is electrically connected with the electrode assembly, wherein the boss abuts against the electrode assembly.

11. The energy storage device of claim 10, wherein, The energy storage device further comprises a Mylar film, which is contained in the receiving cavity, located between the shell and the electrode assembly, wraps the electrode assembly and is connected with the lower insulation piece.

12. An electrical device, characterized by The energy storage device as claimed in claim 10 or 11 is used to supply power to the electric device. The energy storage device as claimed in claim 10 or 11 is used to supply power to the electric device.

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