Battery pack, energy storage device and power utilization system

Abstract

The utility model discloses a battery pack, an energy storage device and a power utilization system. The battery pack comprises a battery box, a plurality of single batteries and a fireproof plate, the battery box comprises a box body and a top cover, and the box body and the top cover define a containing space; the plurality of single batteries are accommodated in the accommodating space, each single battery comprises a cover plate, the cover plate is provided with a first anti-explosion valve, and the first anti-explosion valve is arranged towards the top cover; the fireproof plate is arranged between the plurality of single batteries and the top cover, the fireproof plate comprises a body, the body is provided with a plurality of drainage parts, the plurality of drainage parts are arranged in one-to-one correspondence with the first anti-explosion valves of the plurality of single batteries, and a drainage part is annularly arranged on one side, facing the single batteries, of each drainage part; and one end, facing the single battery, of the drainage part abuts against a cover plate of the single battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack, an energy storage device and an electricity system. Background Art

[0002] With the widespread application of secondary batteries, thermal runaway protection of secondary batteries has received more and more attention. In related technologies, thermal runaway protection of secondary batteries is usually considered to achieve thermal runaway isolation between secondary batteries by placing fireproof partitions between secondary batteries, but rarely considers the protection of high-temperature substances ejected from the explosion-proof valve of the secondary battery.

[0003] Moreover, in the battery pack, due to the limitation of the height of the bus and the poles of the secondary battery, there is usually a gap between the cover of the secondary battery and the top cover of the battery pack, which causes the high-temperature substances ejected from the explosion-proof valve of the secondary battery to spread in the gap, which can easily cause the bus and the collection lines in the battery pack to short-circuit and catch fire, and even cause an explosion, leading to unstoppable heat spread. Utility Model Content

[0004] The present application discloses a battery pack, an energy storage device and an electricity consumption system, which can effectively prevent high-temperature substances ejected from an explosion-proof valve from spreading to the bus and the collection line to cause a short circuit and fire, thereby avoiding the unstoppable heat spread such as the explosion of the battery pack caused by the short circuit and fire.

[0005] In order to achieve the above objectives, in a first aspect, the present application discloses a battery pack, comprising:

[0006] A battery box, the battery box comprising a box body and a top cover, the box body and the top cover are arranged to form a containing space;

[0007] A plurality of single cells, the plurality of single cells are accommodated in the accommodation space, the single cells include a cover plate, the cover plate is provided with a first explosion-proof valve, and the first explosion-proof valve is arranged toward the top cover;

[0008] A fireproof plate, wherein the fireproof plate is arranged between the plurality of single cells and the top cover, and the fireproof plate comprises a main body, wherein the main body has a plurality of drain portions, and the plurality of drain portions are arranged one-to-one correspondingly to the first explosion-proof valves of the plurality of single cells, and each of the drain portions is provided with a drainage portion on one side facing the single cell, and one end of the drainage portion facing the single cell is in contact with the cover plate of the single cell.

[0009] In this embodiment, the single cell is in the accommodating space, the first explosion-proof valve on the single cell is arranged toward the top cover, and the fireproof plate is arranged between the multiple single cells and the top cover, the body of the fireproof plate has multiple drain parts, and the multiple drain parts are arranged one by one corresponding to the multiple first explosion-proof valves, so that when the single cell has thermal runaway, the high-temperature material sprayed from the single cell can be sprayed to between the fireproof plate and the top cover through the corresponding drain parts. In addition, each discharge portion is provided with a drainage portion on one side facing the single cell, and one end of the drainage portion facing the single cell is in contact with the cover plate of the single cell, so that the drainage portion can be surrounded to form a relatively closed drainage channel, so that the high-temperature material sprayed from the first explosion-proof valve of the single cell can be sprayed toward the discharge portion along the drainage channel formed by the drainage portion, and can be sprayed toward between the fireproof plate and the top cover through the discharge portion, effectively preventing the high-temperature material sprayed from the single cell from spreading along the single cell to other single cells, avoiding the short circuit and fire caused by the sprayed high-temperature material spreading along the single cell, thereby effectively avoiding the unstoppable heat spread such as explosion of the battery pack caused by short circuit and fire.

[0010] And one end of the drainage portion facing the single cell is in contact with the cover plate of the single cell, so that a space can be formed between the fireproof plate and the cover plate of the single cell, and the space can be isolated from the drainage channel formed by the drainage portion and the drainage portion, so that when a bus and a collection line are arranged in the space, the high-temperature material sprayed from the first explosion-proof valve can be effectively prevented from spreading to the bus and the collection line, thereby avoiding the short circuit and fire caused by the sprayed high-temperature material spreading to the bus and the collection line, thereby further avoiding the unstoppable heat spread such as the explosion of the battery pack caused by the short circuit and fire.

[0011] In a possible implementation manner of the first aspect, a blocking portion is provided on one side of each of the drain portions facing the top cover.

[0012] In this way, the high-temperature material sprayed between the fireproof plate and the top cover can be effectively reduced from flowing back to the single battery in thermal runaway after scattering on the fireproof plate, thereby reducing the probability of short circuit and fire caused by the backflow of high-temperature material. At the same time, it can also effectively reduce the high-temperature material scattered on the fireproof plate from flowing to the discharge parts at other positions, causing the high-temperature material to flow to other single batteries through other discharge parts, thereby reducing the probability of short circuit and fire caused by the high-temperature material flowing to other single batteries through other discharge parts.

[0013] In a possible implementation manner of the first aspect, a first gap is provided between the top cover and the body, and a second gap is provided between the blocking portion and the top cover.

[0014] Therefore, the high-temperature material sprayed between the fireproof plate and the top cover can be located in the space formed by the first gap and the second gap, so that the sprayed high-temperature material can be scattered in the space and can be evacuated and cooled along the body of the fireproof plate, further preventing the high-temperature material from spreading to other single cells, buses and collection lines to cause short circuits and fires.

[0015] In a possible implementation manner of the first aspect, the blocking portion includes a second annular wall, and an inner circle of a cross section of the second annular wall along a direction parallel to the main body matches an outer contour of the drain portion.

[0016] As a result, not only can the structure of the barrier part be made simpler and easier to implement, but the discharge part can also be completely located in the space enclosed by the second annular wall. While blocking the high-temperature material from flowing back to the discharge part, the space occupied by the barrier part can be reduced, the weight of the fireproof board can be reduced, and the main body can provide more evacuation space for the falling high-temperature material, thereby improving the heat dissipation effect of the high-temperature material.

[0017] In a possible implementation of the first aspect, the drainage portion includes a first annular wall, which is arranged around the first explosion-proof valve, and an inner circle of the cross-section of the first annular wall along a direction parallel to the body matches an outer contour of the first explosion-proof valve.

[0018] Therefore, not only the structure of the drainage part can be made simpler, but also the space occupied by the drainage part can be reduced to prevent the drainage part from interfering with other components, bus bars or collection lines on the single battery.

[0019] In a possible implementation manner of the first aspect, an outer contour of the drain portion matches an outer contour of the first explosion-proof valve.

[0020] As a result, the high-temperature material sprayed from the first explosion-proof valve is not easily obstructed by the main body of the fireproof plate during the spraying process and falls back onto the single battery, so that the sprayed high-temperature material can be sprayed between the fireproof plate and the top cover through the discharge part, so as to be evacuated and cooled in the space between the fireproof plate and the top cover, thereby improving the heat dissipation effect.

[0021] In a possible implementation manner of the first aspect, a thickness of the drain portion is smaller than a thickness of other portions of the body.

[0022] Thus, the discharge portion can be broken under a set pressure, so that when the discharge portion is impacted by a high-temperature substance, it can be broken, thereby achieving the effect of pressure relief and release of the high-temperature substance.

[0023] In a possible implementation manner of the first aspect, the discharge portion includes a one-way bursting membrane, the one-way bursting membrane has a weak area, and the thickness of the weak area is smaller than the thickness of other parts of the one-way bursting membrane.

[0024] Thus, the portion of the one-way bursting membrane located in the thinned area can be easily destroyed when subjected to pressure, so as to prevent the one-way bursting membrane from being completely separated from the body when impacted by high-temperature substances, thereby avoiding the one-way bursting membrane being completely separated from the body and falling onto the single battery, causing an impact on the spraying of high-temperature substances on the single battery.

[0025] In a possible implementation manner of the first aspect, a support portion is provided on a side of the body facing the single battery, and along a thickness direction of the body, a size of the support portion is the same as a size of the drainage portion.

[0026] In this way, the fireproof board can be positioned on the single battery more stably, and the support portion can also play a certain limiting role, which facilitates the installation of the fireproof board.

[0027] In a possible implementation manner of the first aspect, the support portion includes a first support portion and a second support portion, the first support portion and the second support portion both extend along an arrangement direction of the plurality of drainage portions, and are respectively disposed on both sides of the drainage portion.

[0028] In this way, both sides of the drainage part can be supported by the support part, and when the high-temperature material sprayed from the single battery due to an accident is retained between the drainage part and the cover plate, the first support part and the second support part can also play a certain barrier role in the spread of the high-temperature material, thereby delaying the thermal runaway process of the battery pack.

[0029] In a possible implementation manner of the first aspect, the top cover is made of a high temperature resistant material.

[0030] Therefore, when high-temperature material is sprayed onto the top cover, the top cover is not easily melted through, which prevents foreign objects from falling into the box body due to the melting of the top cover and causing short circuits in high-voltage circuits such as the bus inside the box. It also avoids secondary thermal runaway of the battery pack due to short circuits in the high-voltage circuits caused by foreign objects falling into the box.

[0031] In a possible implementation manner of the first aspect, a battery box explosion-proof hole is provided on the top cover, the battery box explosion-proof hole is communicated with the accommodating space, and a second explosion-proof valve is provided in the battery box explosion-proof hole.

[0032] Therefore, when multiple single cells experience thermal runaway and spray out a large amount of high-temperature substances, the sprayed high-temperature substances can be sprayed out of the battery pack through the second explosion-proof valve to cool the battery pack, prevent further heat spread in the battery pack, and avoid further thermal runaway.

[0033] In a second aspect, the present application further discloses an energy storage device, comprising the battery pack described in the first aspect.

[0034] In this embodiment, the battery pack in the energy storage device is the battery pack described in the first aspect above, so the battery pack in this embodiment has the technical effect of the battery pack in the first aspect above.

[0035] In a third aspect, the present application further discloses an electricity consumption system, comprising the energy storage device described in the second aspect.

[0036] In this embodiment, the energy storage device in the power system is the energy storage device in the second aspect above. Therefore, the energy storage device in this embodiment has the technical effect of the energy storage device in the second aspect above.

[0037] Compared with the prior art, the beneficial effects of this application are:

[0038] In this embodiment, the single cell is in the accommodating space, the first explosion-proof valve on the single cell is arranged toward the top cover, and the fireproof plate is arranged between the multiple single cells and the top cover, the body of the fireproof plate has multiple drain parts, and the multiple drain parts are arranged one by one corresponding to the multiple first explosion-proof valves, so that when the single cell has thermal runaway, the high-temperature material sprayed from the single cell can be sprayed to between the fireproof plate and the top cover through the corresponding drain parts. In addition, each discharge portion is provided with a drainage portion on one side facing the single cell, and one end of the drainage portion facing the single cell is in contact with the cover plate of the single cell, so that the drainage portion can be surrounded to form a relatively closed drainage channel, so that the high-temperature material sprayed from the first explosion-proof valve of the single cell can be sprayed toward the discharge portion along the drainage channel formed by the drainage portion, and can be sprayed toward between the fireproof plate and the top cover through the discharge portion, effectively preventing the high-temperature material sprayed from the single cell from spreading along the single cell to other single cells, avoiding the short circuit and fire caused by the sprayed high-temperature material spreading along the single cell, thereby effectively avoiding the unstoppable heat spread such as explosion of the battery pack caused by short circuit and fire.

[0039] And one end of the drainage portion facing the single cell is in contact with the cover plate of the single cell, so that a space can be formed between the fireproof plate and the cover plate of the single cell, and the space can be isolated from the drainage channel formed by the drainage portion and the drainage portion, so that when a bus and a collection line are arranged in the space, the high-temperature material sprayed from the first explosion-proof valve can be effectively prevented from spreading to the bus and the collection line, thereby avoiding the short circuit and fire caused by the sprayed high-temperature material spreading to the bus and the collection line, thereby further avoiding the unstoppable heat spread such as the explosion of the battery pack caused by the short circuit and fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 is a three-dimensional diagram of a battery pack provided in an embodiment of the present application;

[0042] Figure 2 is an exploded diagram of a battery pack provided in an embodiment of the present application;

[0043] Figure 3 is a three-dimensional diagram of a fireproof board provided in an embodiment of the present application;

[0044] Figure 4 yes Figure 3 A magnified image of the position A in the middle;

[0045] Figure 5 yes Figure 3 A three-dimensional image of the fireproof board shown in FIG.

[0046] Figure 6 yes Figure 3 Another stereoscopic view of the fireproof board shown in FIG.

[0047] Figure 7 yes Figure 6 The enlarged image at position B in the middle;

[0048] Figure 8 is a three-dimensional diagram of an energy storage device provided in an embodiment of the present application;

[0049] Fig. 9 It is a structural schematic diagram of an electricity consumption system provided in an embodiment of the present application.

[0050] Description of reference numerals:

[0051] 1-battery box; 11-top cover; 111-second explosion-proof valve; 12-box; 2-monocell; 21-cover plate; 22-first explosion-proof valve; 3-fireproof plate; 31-body; 32-drainage part; 321-one-way bursting membrane; 33-drainage part; 331-first annular wall; 34-blocking part; 341-second annular wall; 35-support part; 351-first support part; 352-second support part;

[0052] 100-battery pack;

[0053] 200-Energy storage device;

[0054] 300-power system; 310-power conversion device; 320-power load. DETAILED DESCRIPTION

[0055] 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.

[0056] In this application, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0058] The present application discloses a battery pack, an energy storage device and an electricity consumption system, which can effectively prevent high-temperature substances ejected from an explosion-proof valve from spreading to the bus and the collection line to cause a short circuit and fire, thereby avoiding the unstoppable heat spread such as the explosion of the battery pack caused by the short circuit and fire.

[0059] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0060] This embodiment provides a battery pack, such as Figure 1-Figure 6As shown, the battery pack 100 includes a battery box 1, a plurality of single cells 2 and a fireproof board 3. The battery box 1 includes a box body 12 and a top cover 11, and the box body 12 and the top cover 11 are arranged to form a storage space; a plurality of single cells 2 are accommodated in the storage space, and the single cells 2 include a cover plate 21, and the cover plate 21 is provided with a first explosion-proof valve 22, and the first explosion-proof valve 22 is arranged toward the top cover 11; the fireproof board 3 is arranged between the plurality of single cells 2 and the top cover 11, and the fireproof board 3 includes a body 31, and the body 31 has a plurality of drainage parts 32, and the plurality of drainage parts 32 are arranged one by one corresponding to the first explosion-proof valves 22 of the plurality of single cells 2, and each drainage part 32 is provided with a drainage part 33 on one side facing the single cell 2, and the drainage part 33 is abutted against the cover plate 21 of the single cell 2 at one end thereof.

[0061] The single cell 2 may be any secondary battery such as a nickel-hydrogen battery, a lithium-ion battery, a nickel-cadmium battery, etc., and is not limited here.

[0062] It should be explained that the above-mentioned discharge portion 32 refers to a structure that allows the high-temperature substances that have been discharged to pass through and continue to be discharged in a direction away from the single cell 2 after the single cell 2 has thermal runaway and the high-temperature substances generated have broken through the first explosion-proof valve 22. It is understandable that the discharge portion 32 may be a weak portion with a relatively weak structural strength that can be broken to form a crack under the impact of the high-temperature substances, or a through hole that allows the high-temperature substances to be directly discharged, or a valve body that can be opened after being subjected to the impact pressure of the high-temperature substances, and is not limited here.

[0063] In this embodiment, multiple single cells 2 are accommodated in the accommodating space formed by the box body 12 and the top cover 11, which can effectively prevent foreign objects from the outside from falling on the single cells 2, avoid foreign objects falling on the single cells 2 and cause short circuits between multiple single cells 2, thereby improving the safety of the battery pack 100.

[0064] Among them, multiple single cells 2 are accommodated in the accommodation space and can be arranged in rows and columns in the accommodation space to facilitate electrical connection of multiple single cells 2, and a heat insulation pad can be arranged between two adjacent single cells 2 to reduce the heat generated by the thermal runaway single cell 2 directly transferred to the adjacent single cell 2 through the shell, thereby achieving the purpose of delaying the heat transfer rate of the battery pack 100 during thermal runaway. Specifically, the material of the heat insulation pad can be aerogel, super cotton, fireproof felt and other materials with extremely low thermal conductivity, which is not limited here.

[0065] The single cell 2 is in the accommodating space, the first explosion-proof valve 22 on the single cell 2 is arranged toward the top cover 11, and the fireproof plate 3 is arranged between the multiple single cells 2 and the top cover 11, and the main body 31 of the fireproof plate 3 has multiple drain parts 32, and the multiple drain parts 32 are arranged one by one corresponding to the multiple first explosion-proof valves 22, so that when the single cell 2 has thermal runaway, the high-temperature material sprayed from the single cell 2 can be sprayed to between the fireproof plate 3 and the top cover 11 through the corresponding drain parts 32. In addition, each discharge portion 32 is provided with a drainage portion 33 on one side facing the single cell 2. The end of the drainage portion 33 facing the single cell 2 is in contact with the cover plate 21 of the single cell 2, so that the drainage portion 33 can be surrounded to form a relatively closed drainage channel, so that the high-temperature material sprayed from the first explosion-proof valve 22 of the single cell 2 can be sprayed toward the discharge portion 32 along the drainage channel formed by the drainage portion 33, and can be sprayed toward between the fireproof plate 3 and the top cover 11 through the discharge portion 32, effectively preventing the high-temperature material sprayed from the single cell 2 from spreading along the single cell 2 to other single cells 2, avoiding the short circuit and fire caused by the sprayed high-temperature material spreading along the single cell 2, thereby effectively avoiding the unstoppable heat spread such as explosion of the battery pack 100 caused by short circuit and fire.

[0066] And one end of the drainage portion 33 facing the single cell 2 is in contact with the cover plate 21 of the single cell 2, so that a space can be formed between the fireproof plate 3 and the cover plate 21 of the single cell 2, and the space can be isolated from the drainage channel formed by the drainage portion 33 and the drainage portion 33, so that when a bus and a collection line are arranged in the space, the high-temperature material sprayed from the first explosion-proof valve 22 can be effectively prevented from spreading to the bus and the collection line, thereby avoiding the short circuit and fire caused by the sprayed high-temperature material spreading to the bus and the collection line, thereby further avoiding the unstoppable heat spread such as the explosion of the battery pack 100 caused by the short circuit and fire.

[0067] Among them, each discharge portion 32 is surrounded by a drainage portion 33 on one side facing the single cell 2. It should be understood that the drainage portion 33 is an annular structure connected end to end around the periphery of the discharge portion 32, and the end of the annular structure facing the single cell 2 is in contact with the cover plate 21 of the single cell 2.

[0068] Alternatively, if Figure 2-Figure 4 As shown, the drainage portion 33 includes a first annular wall 331 , which is disposed around the first explosion-proof valve 22 , and the inner circle of the cross section of the first annular wall 331 along a direction parallel to the body 31 matches the outer contour of the first explosion-proof valve 22 .

[0069] It should be explained that the inner circle of the cross-section of the first annular wall 331 along the direction parallel to the main body 31 matches the outer contour of the first explosion-proof valve 22, which means that the shape and size of the inner circle of the cross-section of the first annular wall 331 along the direction parallel to the main body 31 may be the same as or similar to the shape and size of the outer contour of the first explosion-proof valve 22, or the size of the inner circle of the cross-section of the first annular wall 331 along the direction parallel to the main body 31 is slightly larger than the size of the outer contour of the first explosion-proof valve 22.

[0070] Therefore, not only the structure of the drainage part 33 can be relatively simple, but also the first explosion-proof valve 22 can be completely located in the space enclosed by the first annular wall 331, further preventing the temperature-sensitive material sprayed from the first explosion-proof valve 22 from spreading to other single cells 2 when thermal runaway occurs in the single cell 2; in addition, the space occupied by the drainage part 33 can be reduced to prevent the drainage part 33 from interfering with other components, buses or collection lines on the single cell 2.

[0071] The outer contour of the first explosion-proof valve 22 refers to the contour formed by the outermost lines of the first explosion-proof valve 22 .

[0072] The outer contour of the first explosion-proof valve 22 may be in any of an ellipse, a circle, a waist-shaped hole, a rectangular hole, etc., which is not limited here. Correspondingly, the inner circle shape of the cross section of the first annular wall 331 along the direction parallel to the body 31 may be in any of an ellipse, a circle, a waist-shaped hole, a rectangular hole, etc., which is not limited here.

[0073] In addition, the material of the first annular wall 331 and the material of the main body 31 of the fireproof board 3 can both be fire-resistant and high-temperature resistant materials, such as mica, fireproof stone, rock wool, etc., so that the first annular wall 331 and the main body 31 of the fireproof board 3 are not easily melted by the high-temperature substances sprayed out by the single battery 2.

[0074] Optionally, the drainage portion 33 and the main body 31 may be integrally formed, or may be bonded together, or the drainage portion 33 and the main body 31 may be connected by a snap-fit, which is not limited here.

[0075] In some embodiments, Figure 6 and Figure 7 As shown, a blocking portion 34 is provided around a side of each drain portion 32 facing the top cover 11 .

[0076] In this way, the high-temperature material sprayed between the fireproof board 3 and the top cover 11 can be effectively reduced from flowing back to the thermal runaway single battery 2 after scattering on the fireproof board 3, thereby reducing the probability of short circuit fire caused by the backflow of high-temperature material. At the same time, it can also effectively reduce the high-temperature material scattered on the fireproof board 3 from flowing to the discharge part 32 at other positions, causing the high-temperature material to flow to other single batteries 2 through other discharge parts 32, thereby reducing the probability of short circuit fire caused by the high-temperature material flowing to other single batteries 2 through other discharge parts 32.

[0077] There is a first gap between the top cover 11 and the body 31 , and there is a second gap between the blocking portion 34 and the top cover 11 .

[0078] Therefore, the high-temperature material sprayed between the fireproof plate 3 and the top cover 11 can be located in the space formed by the first gap and the second gap, so that the sprayed high-temperature material can be scattered in the space and can be evacuated and cooled along the main body 31 of the fireproof plate 3, further preventing the high-temperature material from spreading to other single cells 2, the bus and the collection line to cause a short circuit and fire.

[0079] The blocking portion 34 may be an annular protruding structure protruding from the body 31, such as Figure 7 As shown, the blocking portion 34 may include a second annular wall 341 , and an inner circle of a cross section of the second annular wall 341 along a direction parallel to the body 31 matches an outer contour of the drain portion 32 .

[0080] As a result, not only can the structure of the blocking part 34 be simpler and easier to implement, but the discharge part 32 can also be completely located in the space enclosed by the second annular wall 341. While blocking the high-temperature material from flowing back to the discharge part 32, the space occupied by the blocking part 34 can be reduced, thereby reducing the weight of the fireproof board 3, and the main body 31 can provide more evacuation space for the falling high-temperature material, thereby improving the heat dissipation effect on the high-temperature material.

[0081] Among them, the inner circle of the cross-section of the second annular wall 341 along the direction parallel to the main body 31 matches the outer contour of the leakage portion 32, which means that the shape and size of the inner circle of the cross-section of the second annular wall 341 along the direction parallel to the main body 31 may be the same as or similar to the shape and size of the outer contour of the leakage portion 32, or the size of the inner circle of the cross-section of the second annular wall 341 along the direction parallel to the main body 31 is slightly larger than the size of the outer contour of the leakage portion 32.

[0082] The outer contour of the drain portion 32 refers to the contour formed by the outermost lines of the drain portion 32. The shape of the outer contour of the drain portion 32 can be any one of an ellipse, a circle, a waist-shaped hole, a rectangular hole, etc., which is not limited here. Correspondingly, the inner circle shape of the cross section of the second annular wall 341 along the direction parallel to the body 31 can be any one of an ellipse, a circle, a waist-shaped hole, a rectangular hole, etc., which is not limited here.

[0083] In addition, the material of the second annular wall 341 and the material of the main body 31 of the fireproof board 3 can both be fire-resistant and high-temperature resistant materials, such as mica, fireproof stone, rock wool, etc., so that the second annular wall 341 and the main body 31 of the fireproof board 3 are not easily melted by the high-temperature substances sprayed out by the single battery 2.

[0084] Optionally, the blocking portion 34 can be integrally formed with the main body 31 of the fireproof board 3 so that the connection between the blocking portion 34 and the main body 31 is firm and stable; alternatively, the blocking portion 34 is bonded to the main body 31; alternatively, the blocking portion 34 is snap-connected to the main body 31 by a buckle, which is not limited here.

[0085] In some embodiments, the outer contour of the drain portion 32 matches the outer contour of the first explosion-proof valve 22 .

[0086] As a result, the high-temperature material sprayed from the first explosion-proof valve 22 is not easily obstructed by the main body 31 of the fireproof plate 3 during the spraying process and falls back onto the single battery 2, so that the sprayed high-temperature material can be sprayed between the fireproof plate 3 and the top cover 11 through the discharge portion 32, so as to be evacuated and cooled in the space between the fireproof plate 3 and the top cover 11, thereby improving the heat dissipation effect.

[0087] Among them, the outer contour of the discharge portion 32 matches the outer contour of the first explosion-proof valve 22. It should be understood that the shape of the outer contour of the discharge portion 32 is the same or similar to the shape of the outer contour of the first explosion-proof valve 22; and the size of the outer contour of the discharge portion 32 is the same as the size of the outer contour of the first explosion-proof valve 22, or the size of the outer contour of the discharge portion 32 is slightly larger than the size of the outer contour of the first explosion-proof valve 22.

[0088] When the above-mentioned drain portion 32 is a weak portion whose structural strength is lower than the structural strength of other portions of the main body 31 of the fireproof board 3, the material of the drain portion 32 may be the same as that of other portions of the main body 31, or may be different from that of other portions of the main body 31.

[0089] In some embodiments, when the material of the leakage portion 32 is the same as that of other parts of the main body 31, the thickness of the leakage portion 32 may be smaller than the thickness of other parts of the main body 31, so that the leakage portion 32 can rupture under a set pressure, so that the leakage portion 32 can rupture when impacted by a high-temperature substance, thereby achieving the effect of pressure relief and release of high-temperature substances.

[0090] In other embodiments, when the material of the discharge portion 32 may be different from that of other parts of the main body 31, the tensile strength of the discharge portion 32 is lower than that of other parts of the main body 31, so that the discharge portion 32 can rupture at a set pressure. This can also achieve the purpose of the discharge portion 32 being able to rupture when impacted by high-temperature substances.

[0091] Optionally, the drain portion 32 may include a one-way bursting membrane 321 , wherein the one-way bursting membrane 321 has a weak area, and the thickness of the weak area is smaller than the thickness of other parts of the one-way bursting membrane 321 .

[0092] Thus, the portion of the one-way bursting membrane 321 located in the thinned area can be easily destroyed when subjected to pressure, so as to prevent the one-way bursting membrane 321 from being completely separated from the main body 31 when impacted by high-temperature substances, thereby avoiding the one-way bursting membrane 321 being completely separated from the main body 31 and falling onto the single battery 2, thereby affecting the spraying of high-temperature substances on the single battery 2.

[0093] The edge of the one-way bursting membrane 321 can be fixedly connected to the main body 31, and the weak area on the one-way bursting membrane 321 can be located at the center of the one-way bursting membrane 321 or close to the center to prevent the edge of the one-way bursting membrane 321 from being separated from the main body 31 due to a large impact pressure.

[0094] Exemplarily, a plurality of mounting holes may be provided on the main body 31, and the plurality of mounting holes are provided in one-to-one correspondence with the plurality of first explosion-proof valves 22. The one-way bursting membrane 321 may be sealed in the mounting hole, and the one-way bursting membrane 321 is fixedly connected to the hole wall of the mounting hole, or the one-way bursting membrane 321 is fixed to one end of the mounting hole, and the weak area on the one-way bursting membrane 321 may be located at the center of the one-way bursting membrane 321.

[0095] The weak area may be a thinning line, and the shape of the thinning line may be any one of a straight line, a Z-shape, an X-shape, etc., so that the weak area is not easy to separate from other parts of the one-way bursting membrane 321 when being broken. Of course, the shape of the thinning line may also be other shapes, which are not limited here.

[0096] In some embodiments, Figure 3 and Figure 4 As shown, a support portion 35 is provided on one side of the body 31 facing the single battery 2 , and along the thickness direction of the body 31 , the size of the support portion 35 is the same as the size of the drainage portion 33 .

[0097] Thus, the fireproof board 3 can be positioned on the single battery 2 more stably, and the support portion 35 can also play a certain limiting role, which facilitates the installation of the fireproof board 3.

[0098] The support portion 35 may be any one of a support block, a support column, a support protrusion, etc., which is not limited here.

[0099] In addition, the number of the supporting parts 35 can be one, two or more, which is not limited here and can be set according to actual conditions.

[0100] Alternatively, if Figure 3 and Figure 4 As shown, the support portion 35 includes a first support portion 351 and a second support portion 352. The first support portion 351 and the second support portion 352 are arranged along the direction of the plurality of drainage portions 33 (eg Figure 3 The drain portion 33 extends in the direction indicated by x in the figure and is respectively arranged on both sides of the drain portion 33.

[0101] In this way, both sides of the drainage portion 33 can be supported by the support portion 35, and when high-temperature substances ejected from the single battery 2 due to an accident are retained between the drainage portion 33 and the cover plate 21, the first support portion 351 and the second support portion 352 can also play a certain barrier role in the spread of high-temperature substances, thereby delaying the thermal runaway process of the battery pack 100; in addition, the first support portion 351 and the second support portion 352 both extend along the arrangement direction of the plurality of drainage portions 33, so that the first support portion 351 and the second support portion 352 can both be strip structures, which are simple in structure and easy to implement.

[0102] In addition, the battery pack 100 may further include a fixing bracket, and the fireproof board 3 may be fixedly arranged on the box body 12 through the fixing bracket. The fixing bracket and the fireproof board 3 may be connected by screw threads, adhesive bonding, or snap connection, which is not limited here. The fixing bracket and the box body 12 may be welded, screwed, or adhesively bonded, which is not limited here.

[0103] In some embodiments, the material of the top cover 11 is a high temperature resistant material. Therefore, when a high temperature substance is sprayed onto the top cover 11, the top cover 11 is not easily melted through, thereby preventing foreign objects from falling into the box body 12 due to the melting of the top cover 11 and causing a short circuit of the high-voltage circuit such as the busbar in the box body 12, and avoiding secondary thermal runaway of the battery pack 100 due to a short circuit of the high-voltage circuit caused by foreign objects falling into the box body 12.

[0104] The material of the top cover 11 can be any one of aluminum alloy, stainless steel, carbon fiber, etc., which is not limited here.

[0105] Alternatively, if Figure 1 and Figure 2 As shown, the top cover 11 is provided with an explosion-proof hole of the battery box 1 , the explosion-proof hole of the battery box 1 is communicated with the accommodating space, and a second explosion-proof valve 111 is provided in the explosion-proof hole of the battery box 1 .

[0106] Therefore, when multiple single battery cells 2 experience thermal runaway and spray out a large amount of high-temperature substances, the sprayed high-temperature substances can be sprayed out of the battery pack 100 through the second explosion-proof valve 111 to cool the battery pack 100, prevent further heat spread in the battery pack 100, and avoid further thermal runaway.

[0107] The present application also provides an energy storage device 200, such as Figure 8 As shown, it includes the battery pack 100 described in the above embodiment.

[0108] In this embodiment, the battery pack 100 in the energy storage device 200 is the battery pack 100 described in the above embodiment. Therefore, the battery pack 100 in this embodiment has the technical effects of the battery pack 100 in the above embodiment. Since the embodiment has fully described the technical effects of the battery pack 100, they will not be repeated here.

[0109] In addition, the energy storage device 200 may further include an energy storage box, and the multiple battery packs 100 may be disposed in the energy storage box, and the multiple battery packs 100 may be connected in parallel or in series.

[0110] The energy storage device 200 may further include a heat dissipation module, which may include a liquid cooling unit, a liquid inlet pipe and a liquid outlet pipe. The water inlet of the liquid inlet pipe is connected to the water outlet end of the liquid cooling unit, the water outlet of the liquid inlet pipe is connected to the water inlet of the liquid outlet pipe, the water outlet of the liquid outlet pipe is connected to the water inlet end of the liquid cooling unit, and the liquid inlet pipe extends along the multiple battery packs 100 to dissipate heat for the multiple battery packs 100, thereby improving the safety of the energy storage device 200.

[0111] The present application also provides a power system 300, such as Fig. 9 As shown, it includes the energy storage device 200 described in the above embodiment.

[0112] In this embodiment, the energy storage device 200 in the power system 300 is the energy storage device 200 in the above embodiment. Therefore, the energy storage device 200 in this embodiment has the technical effect of the energy storage device 200 in the above embodiment. Since the above embodiment has fully described the technical effect of the energy storage device 200, it will not be repeated here.

[0113] Among them, the power system 300 may also include an electric energy conversion device 310 and an electric load 320. The electric energy conversion device 310 is used to convert other forms of energy into electric energy. The energy storage device 200 can store at least part of the electric energy converted by the electric energy conversion device 310. The energy storage device 200 is also used to provide electric energy to the electric load 320. For example, the electric load 320 is household appliances and street lights. When the power grid is disconnected or there is a power outage, the energy storage device 200 supplies power to the household appliances and street lights.

[0114] In addition, the electric energy conversion device 310 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electric energy.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery pack, characterized in that: include: A battery box, the battery box comprising a box body and a top cover, the box body and the top cover are arranged to form a containing space; A plurality of single cells, the plurality of single cells are accommodated in the accommodation space, the single cells include a cover plate, the cover plate is provided with a first explosion-proof valve, and the first explosion-proof valve is arranged toward the top cover; A fireproof plate, wherein the fireproof plate is arranged between the plurality of single cells and the top cover, and the fireproof plate comprises a main body, wherein the main body has a plurality of drain portions, and the plurality of drain portions are arranged one-to-one correspondingly to the first explosion-proof valves of the plurality of single cells, and each of the drain portions is provided with a drainage portion on one side facing the single cell, and one end of the drainage portion facing the single cell is in contact with the cover plate of the single cell.

2. The battery pack according to claim 1, characterized in that: A blocking portion is provided around one side of each of the drain portions facing the top cover.

3. The battery pack according to claim 2, characterized in that: A first gap is defined between the top cover and the body, and a second gap is defined between the blocking portion and the top cover.

4. The battery pack according to claim 2, characterized in that: The blocking portion includes a second annular wall, and an inner circle of a cross section of the second annular wall along a direction parallel to the body matches an outer contour of the drain portion.

5. The battery pack according to claim 1, characterized in that: The drainage portion includes a first annular wall, which is arranged around the first explosion-proof valve, and an inner circle of a cross section of the first annular wall along a direction parallel to the body matches an outer contour of the first explosion-proof valve.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The outer contour of the discharge portion matches the outer contour of the first explosion-proof valve.

7. The battery pack according to any one of claims 1 to 5, characterized in that: The thickness of the drain portion is smaller than the thickness of other portions of the body.

8. The battery pack according to claim 7, characterized in that: The discharge portion includes a one-way bursting membrane, the one-way bursting membrane has a weak area, and the thickness of the weak area is smaller than the thickness of other parts of the one-way bursting membrane.

9. The battery pack according to any one of claims 1 to 5, characterized in that: A support portion is disposed on one side of the body facing the single battery, and along the thickness direction of the body, the size of the support portion is the same as the size of the drainage portion.

10. The battery pack according to claim 9, characterized in that: The support portion includes a first support portion and a second support portion. The first support portion and the second support portion both extend along an arrangement direction of the plurality of drainage portions and are respectively disposed at two sides of the drainage portion.

11. The battery pack according to any one of claims 1 to 5, characterized in that: The material of the top cover is high temperature resistant material.

12. The battery pack according to any one of claims 1 to 5, characterized in that: The top cover is provided with a battery box explosion-proof hole, the battery box explosion-proof hole is communicated with the accommodating space, and a second explosion-proof valve is provided in the battery box explosion-proof hole.

13. An energy storage device, characterized in that: include: The battery pack according to any one of claims 1 to 12.

14. An electricity system, characterized in that: include: The energy storage device of claim 13.

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