Battery box and battery system

Abstract

The utility model relates to a battery box and a battery system.The battery box is characterized in that a first containing cavity is defined by a supporting plate and a side plate assembly in the battery box, the supporting plate is provided with a plurality of first through holes, the first through holes correspond to anti-explosion valves of single battery cells one to one, and a first heat insulation layer is arranged on the first face of the supporting plate; the first through holes are sealed by the first heat insulation layer; the bottom plate and the supporting plate are arranged at intervals, and a pressure relief cavity is defined by the bottom plate, the supporting plate and the side plate assembly; the first heat insulation layer is configured to penetrate through the corresponding first through hole along with the opening of the anti-explosion valve of the corresponding single battery cell, so that the anti-explosion valve of the corresponding single battery cell is communicated with the pressure relief cavity, the battery cell bonding glue in the first accommodating cavity is prevented from leaking into the pressure relief cavity, and the risk that the pressure relief cavity is blocked is reduced; high-temperature and high-pressure substances sprayed during thermal runaway of the single battery cells can be timely evacuated, so that the risk of thermal runaway of the plurality of single battery cells is reduced, and thermal spread of the battery is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box and a battery system. Background Art

[0002] With the development of battery technology, batteries are increasingly used in electric vehicles, and the battery box is an important component of the battery system. The battery box is usually equipped with a pressure relief chamber, which can release pressure when the battery is in thermal runaway. Battery thermal runaway refers to the rapid rise in temperature beyond the normal operating range due to the runaway internal chemical reaction during the battery charging or discharging process, thereby generating a large amount of heat and gas, and may even cause an explosion or fire.

[0003] In the prior art, the adhesive in the battery case is easy to leak into the pressure relief chamber, causing the pressure relief chamber to be blocked. When a single battery cell has thermal runaway, it is easy to cause thermal runaway of multiple battery cells and cause heat spread. Utility Model Content

[0004] Based on this, it is necessary to provide a battery case and battery system that can prevent the adhesive from leaking into the pressure relief chamber, reduce the risk of the pressure relief chamber being blocked, and reduce the risk of thermal runaway of multiple single cells when thermal runaway occurs in a single single cell, thereby reducing the spread of heat in the battery.

[0005] In a first aspect, the present application provides a battery box, comprising:

[0006] The box body includes a side panel assembly;

[0007] A support plate, wherein the support plate and the side plate assembly enclose a first accommodating cavity, the first accommodating cavity is used to accommodate a plurality of single cells, and the single cells are provided with explosion-proof valves; the support plate is provided with a plurality of first through holes, each of which is provided in a one-to-one correspondence with the explosion-proof valve of each single cell, and a first heat insulation layer is provided on the first surface of the support plate, and the first heat insulation layer seals each of the first through holes;

[0008] The bottom plate is spaced apart from the support plate, and a pressure relief chamber is formed between the bottom plate, the support plate and the side plate assembly; the first thermal insulation layer is configured to penetrate the corresponding first through hole as the explosion-proof valve of the corresponding single battery cell is opened, so that the explosion-proof valve of the corresponding single battery cell is connected to the pressure relief chamber.

[0009] In one embodiment, the first thermal insulation layer includes a plurality of first thermal insulation members, and each first thermal insulation member seals each first through hole one by one.

[0010] In one embodiment, the support plate is further provided with an insulating layer, and each first thermal insulation member is located between the insulating layer and the first surface of the support plate.

[0011] In one of the embodiments, a second thermal insulation component group is disposed on the second surface of the support plate. The second thermal insulation component group is located on the surface of the support plate facing the bottom plate. The second thermal insulation component group is used to seal each first through hole.

[0012] In one embodiment, the box body further comprises a plurality of support beams; each support beam is arranged between the bottom plate and the support plate;

[0013] The support beam is provided with a second accommodating chamber, and the second accommodating chamber is communicated with the pressure relief chamber.

[0014] In one embodiment, a plurality of second through holes are disposed on the first surface of the support beam, the second through holes are disposed corresponding to at least one first through hole, and the second through holes are correspondingly connected to at least one first through hole;

[0015] Each second through hole is communicated with the second accommodating cavity.

[0016] In one of the embodiments, a plurality of third through holes are disposed on the second surface of the support beam, and the second surface of the support beam is adjacent to the first surface of the support beam;

[0017] The second accommodating chamber is connected to the pressure relief chamber through the third through holes.

[0018] In one of the embodiments, a third surface of the support beam is provided with a plurality of fourth through holes, and the third surface of the support beam is adjacent to the first surface of the support beam;

[0019] The second accommodating chamber is connected to the pressure relief chamber through each fourth through hole.

[0020] In one embodiment, the distance between the support plate and the bottom plate is greater than or equal to 6 mm.

[0021] In one of the embodiments, the bottom plate is provided with a third heat insulating member, and the third heat insulating member is located between the bottom plate and the supporting plate.

[0022] In one of the embodiments, the support plate and the side plate assembly are sealed and fixed.

[0023] In a second aspect, the present application provides a battery system, comprising a plurality of single cells and a battery box as described in any one of the above items;

[0024] Each single cell is arranged in a battery box.

[0025] One of the above technical solutions has the following advantages and beneficial effects:

[0026] The above-mentioned battery box includes a box body, a support plate and a bottom plate, and the box body includes a side plate assembly; the support plate and the side plate assembly are enclosed to form a first accommodating chamber, the first accommodating chamber is used to accommodate a plurality of single battery cells, and the single battery cells are provided with explosion-proof valves; the support plate is provided with a plurality of first through holes, each first through hole is arranged in a one-to-one correspondence with the explosion-proof valve of each single battery cell, and the first surface of the support plate is provided with a first thermal insulation layer, and the first thermal insulation layer seals each first through hole; the bottom plate and the support plate are arranged at intervals, and the bottom plate, the support plate and the side plate assembly are enclosed to form a pressure relief chamber; the first thermal insulation layer is configured to penetrate the corresponding first through hole as the explosion-proof valve of the corresponding single battery cell is opened, so that the explosion-proof valve of the corresponding single battery cell is connected to the pressure relief chamber, so as to prevent the battery cell adhesive in the first accommodating chamber from leaking into the pressure relief chamber. The present application sets a first thermal insulation layer on the first surface of the support plate. The first thermal insulation layer should seal each first through hole, that is, the first thermal insulation layer is located between the explosion-proof valve of the corresponding single battery cell and the first through hole, so as to prevent the adhesive in the corresponding first accommodating cavity from leaking from the opening position of the explosion-proof valve of the single battery cell into the pressure relief cavity, thereby blocking the pressure relief cavity and reducing the risk of the pressure relief cavity being blocked; when a single single battery cell has thermal runaway, the explosion-proof valve of the single battery cell opens, so that the first thermal insulation layer can pass through the corresponding first through hole, so as to realize timely evacuation of high-temperature and high-pressure materials ejected when the single battery cell has thermal runaway, reduce the risk of causing thermal runaway of multiple single battery cells, and reduce the risk of short circuit caused by conductive particles ejected when the single battery cell has thermal runaway and damage to related components due to high temperature impact, thereby reducing heat spread in the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the battery box from a first perspective in an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the exploded structure of the support plate in the embodiment of the present application;

[0029] Figure 3 This is a schematic diagram of the partial structure of the battery box in the embodiment of the present application;

[0030] Figure 4 This is a schematic diagram of the structure of the battery box from a second viewing angle in the embodiment of the present application;

[0031] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure from X0 to X1;

[0032] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at A in the middle;

[0033] Figure 7 for Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0034] Figure 8 This is a schematic diagram of the assembly structure of the battery box in the embodiment of the present application;

[0035] Fig. 9 for Figure 8 Schematic diagram of the cross-sectional structure from Y0 to Y1;

[0036] Fig.10 for Fig. 9 Schematic diagram of the enlarged structure at C in the middle;

[0037] Fig.11 for Fig. 9 Schematic diagram of the enlarged structure at D in the middle.

[0038] Reference numerals:

[0039] 100, box body; 110, side panel assembly; 120, first accommodating chamber; 130, support beam; 132, second through hole; 134, third through hole; 136, fourth through hole; 138, second accommodating chamber; 200, support plate; 210, first through hole; 220, first thermal insulation layer; 222, first thermal insulation member; 230, insulating layer; 240, second thermal insulation member group; 300, bottom plate; 310, pressure relief chamber; 320, third thermal insulation member; 400, single cell. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present application.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover inclusions that are not listed. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0043] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0044] In addition, the term "plurality" shall mean two or more.

[0045] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] In one embodiment, Figure 1 and Figure 2 As shown, a battery box is provided, including a box body 100, a support plate 200 and a bottom plate 300, the box body 100 includes a side plate assembly 110; the support plate 200 and the side plate assembly 110 enclose a first accommodating cavity 120, the first accommodating cavity 120 is used to accommodate a plurality of single battery cells 400, and the single battery cells 400 are provided with explosion-proof valves; the support plate 200 is provided with a plurality of first through holes 210, and each first through hole 210 corresponds to the explosion-proof valve of each single battery cell 400. The first surface of the support plate 200 is provided with a first thermal insulation layer 220, and the first thermal insulation layer 220 seals each first through hole 210; the bottom plate 300 and the support plate 200 are spaced apart, and a pressure relief chamber 310 is enclosed between the bottom plate 300, the support plate 200 and the side plate assembly 110; the first thermal insulation layer 220 is configured to penetrate the corresponding first through hole 210 as the explosion-proof valve of the corresponding single battery cell 400 is opened, so that the explosion-proof valve of the corresponding single battery cell 400 is connected to the pressure relief chamber 310.

[0047] Among them, the battery box can be used to install and fix a number of single cells 400. The battery box can be a square structure. Exemplarily, the battery box can also be polygonal or irregular. The box body 100 can be a box body 100 made of metal or non-metallic material. The box body 100 may include a side panel assembly 110, and the side panel assembly 110 may be a side panel structure of an aluminum profile. Exemplarily, for a square-shaped battery box, the side panel assembly 110 is composed of four side panels surrounding and enclosing. For example, according to the orientation, the four side panels can be divided into a front side panel, a rear side panel, a left side panel and a right side panel. The front side panel is arranged opposite to the rear side panel, and the left side panel is arranged opposite to the right side panel.

[0048] A connection portion is provided at one end of the side plate assembly 110, and a support plate 200 is provided at the connection portion of the side plate assembly 110. The support plate 200 is used to support each single cell 400. The support plate 200 and the side plate assembly 110 enclose a first accommodating cavity 120, and each single cell 400 is provided in the first accommodating cavity 120. Exemplarily, the single cell 400 may be a cylindrical cell, and an explosion-proof valve is provided at the bottom of the single cell 400. The explosion-proof valve of the single cell 400 opens when the single cell 400 has thermal runaway, so that the high-temperature substances and gases in the single cell 400 are discharged in time. The single cells 400 are arranged in multiple rows and columns. In order to fix each single cell 400 and prevent it from shaking and causing damage in the first accommodating cavity 120, it is necessary to inject adhesive into the first accommodating cavity 120, and fill the remaining space in the first accommodating cavity 120 with adhesive, such as filling the gap between the single cells 400 and the single cells 400 with adhesive, so as to achieve a firm installation of each single cell 400. It should be noted that the adhesive can be a foaming glue.

[0049] The support plate 200 can be a sheet metal, for example, a sheet metal made of aluminum alloy. The support plate 200 is integrally manufactured to avoid the use of a spliced ​​support plate 200, thereby reducing the risk of adhesive leakage of the single cell 400 blocking the pressure relief cavity 310.

[0050] The support plate 200 is provided with a plurality of first through holes 210, and each first through hole 210 is arranged in multiple rows and columns. It should be noted that the spacing between the first through holes 210 and the first through holes 210 can be determined according to the shape and size of the single battery cell 400. Each first through hole 210 is arranged in a one-to-one correspondence with the explosion-proof valve of each single battery cell 400, that is, the first through hole 210 directly above corresponds to the explosion-proof valve of the corresponding battery cell; the first through hole 210 is arranged in the support plate 200 to match the explosion-proof valve of the single battery cell 400. The first through hole 210 is used to allow the high-temperature substances and gases ejected from the explosion-proof valve of the single battery cell 400 to pass through when the single battery cell 400 is thermally runaway, and then enter the pressure relief chamber 310.

[0051] The first surface of the support plate 200 is provided with a first heat insulating layer 220, which may be a heat insulating layer made of mica or other high temperature resistant insulating materials, and the first heat insulating layer 220 seals each first through hole 210. The first heat insulating layer 220 can cover each of the first through holes 210, for example, the shape and size of the first heat insulating layer 220 are the same as those of the support plate 200, so that the first heat insulating layer 220 can completely cover and seal each of the first through holes 210.

[0052] The first heat insulation layer 220 can be sealed and arranged on the first surface of the support plate 200 by bonding or other methods. By arranging the first heat insulation layer 220 on the first surface of the support plate 200, and the first heat insulation layer 220 sealing each first through hole 210 on the support plate 200, that is, sealing the opening of the explosion-proof valve of the corresponding single battery cell 400, it can effectively prevent the adhesive of the single battery cell 400 from overflowing from the first through hole 210 to the pressure relief chamber 310, and avoid the pressure relief chamber 310 being blocked to affect the evacuation of high-temperature and high-pressure substances generated by thermal runaway of the single battery cell 400.

[0053] The bottom plate 300 is disposed below the support plate 200, and the bottom plate 300 and the support plate 200 are spaced apart from each other, and the bottom plate 300, the support plate 200 and the side plate assembly 110 enclose a pressure relief chamber 310. A pressure relief valve may be disposed on the side wall or the bottom of the pressure relief chamber 310, and by opening the pressure relief valve, the high-temperature and high-pressure substances in the pressure relief chamber 310 may be discharged to the outside. For example, a pressure relief valve may be disposed at a corresponding position of the side plate assembly 110 or the bottom plate 300.

[0054] When any single cell 400 in the first accommodating cavity 120 experiences thermal runaway, the explosion-proof valve of the single cell 400 opens, so that the corresponding position of the first thermal insulation layer 220 is broken through by the thermal runaway of the single cell 400, and the first through hole 210 is connected, so that the explosion-proof valve of the corresponding single cell 400 is connected to the pressure relief cavity 310, and the high-temperature and high-pressure substances generated by the thermal runaway are transferred to the pressure relief cavity 310 through the corresponding first through hole 210. At the same time, since the first thermal insulation layer 220 is broken through at the position corresponding to the single cell 400 where the thermal runaway occurs, the other positions of the first thermal insulation layer 220 remain intact, thereby effectively preventing the high-temperature substances from backflowing, thereby heating or short-circuiting other single cells 400 to cause thermal runaway.

[0055] In the above-mentioned battery box, a first accommodating cavity 120 is formed by enclosing between the support plate 200 and the side plate assembly 110. The first accommodating cavity 120 is used to accommodate a plurality of single battery cells 400, and the single battery cells 400 are provided with explosion-proof valves; the support plate 200 is provided with a plurality of first through holes 210, and each first through hole 210 is provided in a one-to-one correspondence with the explosion-proof valve of each single battery cell 400, and the first surface of the support plate 200 is provided with a first heat insulation layer 220, and each first heat insulation layer 220 seals each The first through hole 210; the bottom plate 300 and the support plate 200 are spaced apart, and the bottom plate 300, the support plate 200 and the side plate assembly 110 enclose a pressure relief chamber 310; the first thermal insulation layer 220 is configured to penetrate the corresponding first through hole 210 as the explosion-proof valve of the corresponding single battery cell 400 is opened, so that the explosion-proof valve of the corresponding single battery cell 400 is connected with the pressure relief chamber 310, so as to prevent the battery cell adhesive in the first accommodating chamber 120 from leaking into the pressure relief chamber 310. In the present application, a first heat insulation layer 220 is provided on the first surface of the support plate 200, and the first heat insulation layer 220 seals each first through hole 210, that is, the first heat insulation layer 220 is located between the explosion-proof valve of the corresponding single battery cell 400 and the first through hole 210, so as to prevent the adhesive in the corresponding first accommodating cavity 120 from leaking from the opening position of the explosion-proof valve of the single battery cell 400 into the pressure relief cavity 310, thereby blocking the pressure relief cavity 310 and reducing the risk of the pressure relief cavity 310 being blocked; when a single single battery cell 400 has thermal runaway, the explosion-proof valve of the single battery cell 400 is opened, so that the first heat insulation layer 220 can pass through the corresponding first through hole 210, so as to realize timely evacuation of high-temperature and high-pressure materials ejected when the single battery cell 400 has thermal runaway, reduce the risk of causing thermal runaway of multiple single battery cells 400, and reduce the risk of short circuit caused by conductive particles ejected when the single battery cell 400 has thermal runaway and the risk of related components being damaged by high temperature impact, thereby reducing heat spread of the battery.

[0056] In one embodiment, the first thermal insulation layer 220 includes a plurality of first thermal insulation members 222 , and each first thermal insulation member 222 seals each first through hole 210 one by one.

[0057] The first thermal insulation member 222 may be a thermal insulation member made of mica or other high temperature resistant insulating material. The number of the first thermal insulation members 222 is the same as the number of the first through holes 210 on the support plate 200, and each first thermal insulation member 222 seals each first through hole 210 one by one. The shape of the first thermal insulation member 222 may be square, circular or elliptical. For example, the shape of the first thermal insulation member 222 is the same as the shape of the first through hole 210, such as the shapes of the first thermal insulation member 222 and the first through hole 210 are both circular. The size of the first thermal insulation member 222 matches the size of the corresponding first through hole 210 on the support plate 200, so that the first thermal insulation member 222 can seal the corresponding first through hole 210. For example, the size of the first thermal insulation member 222 is larger than the size of the corresponding first through hole 210, and the two adjacent first thermal insulation members 222 are spaced apart, so that the first thermal insulation member 222 can seal the corresponding first through hole 210, and at the same time can effectively prevent the high-temperature material generated by the thermal runaway of a single battery cell 400 from backflowing, causing heating or short circuit and causing thermal runaway of other battery cells 400.

[0058] In one embodiment, Figure 2 , Fig.10 and Fig.11 As shown, the support plate 200 is further provided with an insulating layer 230 , and each first thermal insulation member 222 is located between the insulating layer 230 and the first surface of the support plate 200 .

[0059] The insulating layer 230 is a thin film structure. The insulating layer 230 is covered on each first thermal insulation member 222, that is, each first thermal insulation member 222 is located between the insulating layer 230 and the first surface of the support plate 200. Exemplarily, the insulating layer 230 can be disposed on each first thermal insulation member 222 by hot pressing or the like.

[0060] An insulating layer 230 is arranged on the first surface of the support plate 200, and the insulating layer 230 covers each first thermal insulation component 222, thereby achieving insulation protection for the bottom of each single battery cell 400. In addition, it can further prevent the adhesive of the single battery cell 400 from overflowing into the pressure relief cavity 310 below, thereby preventing the pressure relief cavity 310 from being blocked and affecting the evacuation of high-temperature and high-pressure substances generated by thermal runaway of the single battery cell 400.

[0061] For example, when any single cell 400 experiences thermal runaway, the explosion-proof valve of the single cell 400 opens, so that the insulating layer 230 and the corresponding first thermal insulation component 222 at the position of the explosion-proof valve of the corresponding single cell 400 are broken by the thermal runaway of the single cell 400, and the first through hole 210 is turned on, so that the explosion-proof valve of the corresponding single cell 400 is connected to the pressure relief chamber 310, and the high-temperature and high-pressure substances generated by the thermal runaway are transferred to the pressure relief chamber 310 through the corresponding first through hole 210, so as to realize timely evacuation of the high-temperature and high-pressure substances ejected when the single cell 400 experiences thermal runaway, reduce the risk of causing thermal runaway of multiple single cells 400, and reduce heat spread in the battery.

[0062] In one embodiment, Figure 2 , Fig.10 and Fig.11 As shown, a second thermal insulation component group 240 is disposed on the second surface of the support plate 200 . The second thermal insulation component group 240 is located on the side of the support plate 200 facing the bottom plate 300 . The second thermal insulation component group 240 is used to seal each first through hole 210 .

[0063] Among them, the second surface of the support plate 200 is opposite to the first surface, for example, the first surface of the support plate 200 is adjacent to the first accommodating cavity 120, and the second surface of the support plate 200 is adjacent to the pressure relief cavity 310. The second thermal insulation component group 240 may include a plurality of second thermal insulation components, the second thermal insulation components are in a sheet-like structure, each second thermal insulation component is arranged at intervals on the second surface of the support plate 200, and each second thermal insulation component can be arranged on the second surface of the support plate 200 by bonding or other means to cover and seal each first through hole 210 at a corresponding position on the support plate 200. The second thermal insulation component may be a thermal insulation component made of mica or other high-temperature resistant insulating material. The interval between two adjacent second thermal insulation components enables the second thermal insulation component to seal the corresponding first through hole 210, and at the same time, it can further prevent the high-temperature material generated by the thermal runaway of a single single battery cell 400 from backflowing, resulting in heating or short circuit causing thermal runaway of other single battery cells 400.

[0064] By arranging the second thermal insulation component group 240 between the support plate 200 and the bottom plate 300, the second thermal insulation component group 240 is arranged on the second surface of the support plate 200, and the second thermal insulation component group 240 seals each first through hole 210 on the support plate 200, that is, the corresponding single battery cell 400 explosion-proof valve opening is sealed, thereby achieving double-sided sealing of each first through hole 210 on the support plate 200, thereby effectively blocking the adhesive of the single battery cell 400 from overflowing from the first through hole 210 to the pressure relief chamber 310, avoiding the pressure relief chamber 310 from being blocked and affecting the evacuation of high-temperature and high-pressure substances generated by thermal runaway of the single battery cell 400, and further reducing the risk of the pressure relief chamber 310 being blocked.

[0065] When any single cell 400 experiences thermal runaway, the explosion-proof valve of the single cell 400 opens, so that the corresponding first thermal insulation member 222 and the second thermal insulation member group 240 are broken through by the high-temperature material generated by the thermal runaway of the single cell 400, and the first through hole 210 is connected, so that the explosion-proof valve of the corresponding single cell 400 is connected to the pressure relief chamber 310, and the high-temperature and high-pressure material generated by the thermal runaway is transferred to the pressure relief chamber 310 through the corresponding first through hole 210. At the same time, due to the heat insulation effect of the first thermal insulation member 222 and the second thermal insulation member, except for the position of the single cell 400 where the thermal runaway occurs, the other first thermal insulation members 222 remain intact, thereby further reducing the risk of short circuit caused by the conductive particles ejected during thermal runaway of the single cell 400 and damage to related components due to high temperature impact, thereby reducing heat spread in the battery.

[0066] In one embodiment, Figure 3 and Fig. 9 As shown, the box body 100 also includes a plurality of support beams 130 ; each support beam 130 is disposed between the bottom plate 300 and the support plate 200 ; the support beam 130 is provided with a second accommodating cavity 138 , and the second accommodating cavity 138 is communicated with the pressure relief cavity 310 .

[0067] The support beam 130 is disposed adjacent to the bottom of the side plate assembly 110 . For example, the support beam 130 can be disposed at the bottom of the side plate assembly 110 by welding or screwing. The support beam 130 plays a role in reinforcing and supporting the box body 100 .

[0068] The support plate 200 is disposed above the support beam 130 and the bottom plate 300 is disposed below the support beam 130 , that is, each support beam 130 is disposed between the bottom plate 300 and the support plate 200 , so that the support plate 200 and the bottom plate 300 are spaced apart from each other.

[0069] Exemplarily, three support beams 130 are arranged at intervals at the bottom of the side panel assembly 110, and the three support beams 130 are arranged between the bottom plate 300 and the support plate 200, thereby dividing the pressure relief chamber 310 into three pressure relief spaces, and by arranging a second accommodating chamber 138 on the support beam 130, the second accommodating chamber 138 of the support beam 130 is connected with the pressure relief chamber 310, thereby making the three pressure relief spaces interconnected, so that when high-temperature and high-pressure substances generated by thermal runaway of the single battery cell 400 are collected in the pressure relief chamber 310, they can be discharged in time through the pressure relief valve.

[0070] It should be noted that since the internal cavity of the support beam 130 is connected to the pressure relief chamber 310, the support beam 130 will be subjected to the impact of high-temperature conductive particles or gases. For example, the support beam 130 can be sprayed to form a spray coating on the outer surface and inner wall of the support beam 130. The spray coating has the characteristics of high temperature resistance and good insulation, thereby effectively reducing the risk of short circuit or melting of the support beam 130 body due to thermal runaway of the single battery cell 400.

[0071] In one example, if Figure 3 As shown, a plurality of second through holes 132 are provided on the first surface of the support beam 130 . The second through holes 132 are provided corresponding to at least one first through hole 210 , and the second through holes 132 are correspondingly connected to at least one first through hole 210 ; each second through hole 132 is connected to the second accommodating cavity 138 .

[0072] The first surface of the support beam 130 is the top surface, for example, the first surface of the support beam 130 is adjacent to the second surface of the support plate 200, and the first surface of the support beam 130 is parallel to the second surface of the support plate 200. The first surface of the support beam 130 is provided with a plurality of second through holes 132.

[0073] Exemplarily, the size of the second through hole 132 is greater than or equal to the size of the first through hole 210, and the shape of the second through hole 132 is the same as the shape of the first through hole 210. For example, the second through hole 132 is circular, and the second through hole 132 is arranged corresponding to the corresponding first through hole 210, so that when the corresponding first through hole 210 penetrates, the corresponding explosion-proof valve of the single battery cell 400 is connected to the second accommodating cavity 138 of the corresponding support beam 130.

[0074] When the single cell 400 above the support beam 130 is in thermal runaway, the explosion-proof valve of the single cell 400 is opened, so that the corresponding first thermal insulation member 222 is broken by the thermal runaway of the single cell 400, and the first through hole 210 is connected, so that the explosion-proof valve, the first through hole 210, the second through hole 132 of the corresponding single cell 400 are connected with the second accommodating chamber 138, and the high-temperature and high-pressure substances generated by the thermal runaway are transferred to the second accommodating chamber 138 of the corresponding support beam 130 through the corresponding first through hole 210 and the second through hole 132. Based on the communication between the second accommodating chamber 138 of the support beam 130 and the pressure relief chamber 310, the high-temperature and high-pressure substances in the second accommodating chamber 138 are transferred to the pressure relief chamber 310 and discharged to the external environment through the pressure relief valve, so as to avoid the first through hole 210 above the support beam 130 being blocked by the support beam 130, so as to realize timely evacuation of the high-temperature and high-pressure substances ejected when the single cell 400 is in thermal runaway, and reduce the risk of causing thermal runaway of multiple single cells 400.

[0075] In one example, if Figures 8 to 11As shown, a plurality of third through holes 134 are provided on the second surface of the support beam 130 , and the second surface of the support beam 130 is adjacent to the first surface of the support beam 130 ; the second accommodating cavity 138 is connected to the pressure relief cavity 310 through each third through hole 134 .

[0076] The support beam 130 may be in a rectangular strip structure. The second surface of the support beam 130 is adjacent to the first surface of the support beam 130 , for example, the second surface of the support beam 130 is perpendicular to the first surface of the support beam 130 .

[0077] The size of the third through hole 134 can be set to be larger than the size of the second through hole 132. By setting a plurality of third through holes 134 on the second surface of the support beam 130, the second accommodating chamber 138 of the support beam 130 is connected to the pressure relief chamber 310 through the third through holes 134. When the single cell 400 above the support beam 130 has a thermal runaway, the explosion-proof valve of the single cell 400 is opened, so that the corresponding first thermal insulation member 222 is broken by the thermal runaway of the single cell 400, and the first through hole 210 is connected. The high-temperature and high-pressure substances generated by the thermal runaway are transferred to the second accommodating chamber 138 of the corresponding support beam 130 through the corresponding first through hole 210 and the second through hole 132. The high-temperature and high-pressure substances in the second accommodating chamber 138 are evacuated to the pressure relief chamber 310 through the third through holes 134 and discharged to the external environment through the pressure relief valve, so as to realize timely evacuation of the high-temperature and high-pressure substances ejected when the single cell 400 has a thermal runaway, thereby reducing the risk of causing thermal runaway of multiple single cells 400.

[0078] In one example, if Figures 8 to 11 As shown, the third surface of the support beam 130 is provided with a plurality of fourth through holes 136 , and the third surface of the support beam 130 is adjacent to the first surface of the support beam 130 ; the second accommodating cavity 138 is connected to the pressure relief cavity 310 through each fourth through hole 136 .

[0079] The third surface of the support beam 130 is adjacent to the first surface of the support beam 130, for example, the third surface of the support beam 130 is perpendicular to the first surface of the support beam 130. Exemplarily, each fourth through hole 136 is arranged in a one-to-one correspondence with each third through hole 134, so that a plurality of pressure relief channels are formed in the second accommodating cavity 138 of the support beam 130, and each pressure relief channel is connected to the pressure relief cavity 310.

[0080] The size of the fourth through hole 136 can be set to be larger than the size of the second through hole 132. By setting a plurality of fourth through holes 136 on the third surface of the support beam 130, the second accommodating chamber 138 of the support beam 130 is connected to the pressure relief chamber 310 through each fourth through hole 136. When the single cell 400 above the support beam 130 is in thermal runaway, the explosion-proof valve of the single cell 400 is opened, so that the corresponding first thermal insulation member 222 is broken by the thermal runaway of the single cell 400, and the first through hole 210 is connected. The high-temperature and high-pressure substances generated by the thermal runaway are transferred to the second accommodating chamber 138 of the corresponding support beam 130 through the corresponding first through hole 210 and the second through hole 132. The high-temperature and high-pressure substances in the second accommodating chamber 138 are evacuated to the pressure relief chamber 310 through each fourth through hole 136, and discharged to the external environment through the pressure relief valve, so as to achieve timely evacuation of the high-temperature and high-pressure substances ejected when the single cell 400 is in thermal runaway, thereby reducing the risk of causing thermal runaway of multiple single cells 400.

[0081] In one embodiment, the distance range between the support plate and the bottom plate is greater than or equal to 6 mm. It should be noted that, under the condition that the space limitation of the battery box is met, the larger the distance between the support plate and the bottom plate is set, the better. Exemplarily, the distance range between the support plate and the bottom plate can be set to be greater than or equal to 6 mm and less than 10 mm. By setting the distance range between the support plate and the bottom plate, the battery box space is met, and at the same time, it is ensured that the explosion-proof valve can be opened when thermal runaway occurs in the single cell, and the bottom will not be penetrated.

[0082] In one embodiment, Fig.10 and Fig.11 As shown, the bottom plate 300 is provided with a third heat insulating member 320 , and the third heat insulating member 320 is located between the bottom plate 300 and the support plate 200 .

[0083] Among them, the third thermal insulation member 320 can be set on the top surface of the bottom plate 300. For example, the third thermal insulation member 320 can be set on the top surface of the bottom plate 300 by bonding or the like. The third thermal insulation member 320 can be a thermal insulation member made of mica or other high-temperature resistant insulating materials. The shape of the third thermal insulation member 320 can be a sheet. The third thermal insulation member 320 is covered and set on the top surface of the bottom plate 300 to effectively block the impact of high-temperature substances on the bottom plate 300 and prevent the bottom plate 300 from being melted through; at the same time, the third thermal insulation member 320 can prevent the high-temperature conductive particles ejected by the thermal runaway of the single battery cell 400 from contacting the bottom plate 300 and causing a short circuit in the battery system.

[0084] In one embodiment, Figures 4 to 6 As shown, the support plate 200 and the side plate assembly 110 are sealed and fixed.

[0085] The support plate 200 and the side plate assembly 110 can be sealed and fixedly connected by welding. For example, the four sides of the support plate 200 can be sealed and fixedly connected to the side plate assembly 110 by stir friction welding or arc welding, thereby strengthening the sealing between the support plate 200 and the side plate assembly 110, preventing the adhesive in the first accommodating cavity 120 from leaking through the joint position of the support plate 200 into the pressure relief cavity 310 and blocking the pressure relief cavity 310, thereby reducing the risk of adhesive leakage blocking the pressure relief cavity 310.

[0086] In one example, if Figure 4 , Figure 5 and Figure 7 As shown, the support plate 200 and the support beam 130 can be fixedly connected by local welding, for example, the support plate 200 and the support beam 130 can be fixedly connected by arc welding, thereby enhancing the firmness of the battery box.

[0087] In one embodiment, a battery system is further provided, comprising a plurality of single cells and a battery box as described above; each single cell is disposed in the battery box.

[0088] The single cell may be a cylindrical cell, and an explosion-proof valve is arranged at the bottom of the single cell. The single cells are arranged in multiple rows and columns in the battery box.

[0089] For the specific description of the battery case, please refer to the specific description of the battery case in the above embodiment, which will not be repeated here.

[0090] A plurality of single battery cells are arranged in a first accommodating cavity formed between a support plate and a side plate assembly, the support plate is provided with a plurality of first through holes, each first through hole is arranged one-to-one corresponding to an explosion-proof valve of each single battery cell, a plurality of first thermal insulation members are arranged on the first surface of the support plate, each first thermal insulation member seals each first through hole one-to-one; the bottom plate and the support plate are arranged at intervals, and a pressure relief cavity is formed between the bottom plate, the support plate and the side plate assembly; the first thermal insulation member is configured to penetrate the corresponding first through hole as the explosion-proof valve of the corresponding single battery cell is opened, so that the explosion-proof valve of the corresponding single battery cell is connected with the pressure relief cavity, so as to prevent the battery cell adhesive in the first accommodating cavity from leaking into the pressure relief cavity.

[0091] In the above-mentioned embodiment, a plurality of first thermal insulation members are arranged on the first surface of the support plate, and each first thermal insulation member seals each first through hole one by one, that is, the first thermal insulation member is located between the explosion-proof valve of the corresponding single cell and the first through hole, so as to prevent the adhesive in the corresponding first accommodating cavity from leaking from the opening position of the explosion-proof valve of the single cell into the pressure relief cavity, thereby blocking the pressure relief cavity and reducing the risk of the pressure relief cavity being blocked; when a single single cell has thermal runaway, the explosion-proof valve of the single cell opens, so that the corresponding first thermal insulation member can pass through the corresponding first through hole, so as to realize timely evacuation of high-temperature and high-pressure materials ejected during thermal runaway of the single cell, reduce the risk of causing thermal runaway of multiple single cells, reduce the risk of causing short circuit caused by conductive particles ejected during thermal runaway of the single cell and damage of related components due to high temperature impact, and reduce heat spread in the battery.

[0092] It should be noted that the battery system may also include components such as a BMS, and a specific battery system may include more components than those described in the above embodiments, or combine certain components, or have a different arrangement of components.

[0093] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery box, characterized in that: include: A box body, the box body comprising a side panel assembly; A support plate, wherein the support plate and the side plate assembly enclose a first accommodating cavity, wherein the first accommodating cavity is used to accommodate a plurality of single cells, wherein the single cells are provided with explosion-proof valves; the support plate is provided with a plurality of first through holes, wherein each of the first through holes is provided in a one-to-one correspondence with the explosion-proof valve of each of the single cells, and a first heat insulation layer is provided on the first surface of the support plate, wherein the first heat insulation layer seals each of the first through holes; A bottom plate, wherein the bottom plate and the support plate are spaced apart, and a pressure relief chamber is enclosed between the bottom plate, the support plate and the side plate assembly; the first heat insulation layer is configured to penetrate the corresponding first through hole as the explosion-proof valve of the corresponding single battery cell is opened, so that the explosion-proof valve of the corresponding single battery cell is connected to the pressure relief chamber.

2. The battery box according to claim 1, characterized in that: The first heat insulation layer includes a plurality of first heat insulation members, and each of the first heat insulation members seals each of the first through holes in a one-to-one correspondence.

3. The battery box according to claim 2, characterized in that: The support plate is further provided with an insulating layer, and each of the first thermal insulation members is located between the insulating layer and the first surface of the support plate.

4. The battery box according to claim 1, characterized in that: A second heat insulating component group is disposed on the second surface of the support plate. The second heat insulating component group is located on the surface of the support plate facing the bottom plate. The second heat insulating component group is used to seal each of the first through holes.

5. The battery box according to claim 1, characterized in that: The box body also includes a plurality of support beams; each of the support beams is arranged between the bottom plate and the support plate; The support beam is provided with a second accommodating chamber, and the second accommodating chamber is communicated with the pressure relief chamber.

6. The battery box according to claim 5, characterized in that: The first surface of the support beam is provided with a plurality of second through holes, the second through holes are provided corresponding to at least one of the first through holes, and the second through holes are correspondingly connected to at least one of the first through holes; Each of the second through holes is communicated with the second accommodating cavity.

7. The battery case according to claim 6, characterized in that: A plurality of third through holes are provided on the second surface of the support beam, and the second surface of the support beam is adjacent to the first surface of the support beam; The second accommodating chamber is connected to the pressure relief chamber through the third through holes.

8. The battery case according to claim 7, characterized in that: A plurality of fourth through holes are provided on the third surface of the support beam, and the third surface of the support beam is adjacent to the first surface of the support beam; The second accommodating chamber is connected to the pressure relief chamber through the fourth through holes.

9. The battery box according to claim 1, characterized in that: The distance between the support plate and the bottom plate is greater than or equal to 6 mm.

10. The battery case according to any one of claims 1 to 9, characterized in that: The bottom plate is provided with a third heat insulating member, and the third heat insulating member is located between the bottom plate and the support plate.

11. The battery case according to any one of claims 1 to 9, characterized in that: The support plate and the side plate assembly are sealed and fixedly arranged.

12. A battery system, characterized in that: A battery box comprising a plurality of single cells and a battery box as claimed in any one of claims 1 to 11; Each of the single cells is arranged in the battery box.

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