Flat explosion-proof battery pack and vehicle

Abstract

The utility model relates to a horizontal explosion-proof battery pack and a vehicle. The horizontal explosion-proof battery pack comprises a box body, the battery pairs are arranged in the box body, each battery pair comprises a first battery assembly and a second battery assembly which are oppositely arranged, and the oppositely arranged side walls of the first battery assembly and the second battery assembly are each provided with an anti-explosion valve used for providing a spray flow path; and the protection part is arranged in the box body and is positioned between the first battery assembly and the second battery assembly, and the protection part comprises a curved surface part facing the first battery assembly corresponding anti-explosion valve and the second battery assembly corresponding anti-explosion valve. And through the protection piece, the fire particles can be prevented from impacting other battery assemblies, so that the probability of overall thermal runaway of the battery pack is reduced. Meanwhile, due to the arrangement of the curved surface part on the protection part, on one hand, the particles with fire are obliquely erupted to the protection part at a certain angle, and on the other hand, the contact area with the particles with fire is increased by the curved surface part, the impact of the particles with fire on the protection part is reduced, and the safety of the battery is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of flat-laid explosion-proof battery packs, and in particular to flat-laid explosion-proof battery packs and vehicles. Background Art

[0002] New energy vehicles use lithium batteries as their power source. Due to the constraints of the vehicle body, the battery pack is usually installed on the chassis of the new energy vehicle, on which seats are set, etc. Therefore, as the popularity of new energy vehicles increases, the safety performance of the battery pack is crucial to the development of new energy vehicles.

[0003] However, the high voltage and high capacity of existing battery packs make it easy for the battery cells in the battery pack to expand, explode, or experience thermal runaway when the battery pack is overcharged, hit, or at high temperatures, which in turn causes thermal runaway of the entire battery pack. Thermal runaway of the battery pack can seriously endanger the lives of passengers. Utility Model Content

[0004] Based on this, it is necessary to provide a flat-type explosion-proof battery pack and vehicle to address the hidden dangers of battery explosion.

[0005] A flat explosion-proof battery pack, comprising:

[0006] A plurality of battery pairs, each battery pair comprising a first battery assembly and a second battery assembly disposed opposite to each other, and explosion-proof valves for providing a flow path for the jet are disposed on side walls of the first battery assembly and the second battery assembly disposed opposite to each other;

[0007] The protective member is located between the first battery assembly and the second battery assembly, and includes a curved portion facing the explosion-proof valve corresponding to the first battery assembly and the explosion-proof valve corresponding to the second battery assembly.

[0008] In one embodiment, the curved surface portion includes a convex curved surface and / or a concave curved surface.

[0009] In one embodiment, the first battery assembly and the second battery assembly each include a plurality of battery cells stacked along a first direction and / or a second direction, each battery cell including an explosion-proof valve; the number of battery cells in the first battery assembly is the same as that in the second battery assembly and they are stacked in the same manner;

[0010] The first direction is the length direction of the explosion-proof valve distribution area, and the second direction is the width direction of the explosion-proof valve distribution area.

[0011] In one embodiment, the protective member further comprises an upper barrier portion and a lower barrier portion, the top end of the curved portion is connected to the middle of the upper barrier portion, and the bottom end of the curved portion is connected to the middle of the lower barrier portion;

[0012] The upper blocking portion, the curved surface portion, and the lower blocking portion extend along a first direction.

[0013] In one embodiment, both end surfaces of the upper barrier portion and both end surfaces of the lower barrier portion abut against side walls of the first battery assembly and the second battery assembly that are oppositely disposed, respectively;

[0014] Alternatively, the bottom surfaces at both ends of the upper barrier portion and the top surfaces at both ends of the lower barrier portion partially abut against the upper surface and the lower surface of the first battery assembly and the second battery assembly, respectively.

[0015] In one embodiment, the flat explosion-proof battery pack further includes a box body, in which a plurality of battery pairs are accommodated, and the box body includes a lower box body and an upper box cover;

[0016] A plurality of support beams corresponding to the protective members are arranged on the bottom wall of the lower box body, and a plurality of protruding columns are arranged on each support beam; and a plurality of mounting grooves corresponding to the protruding columns are arranged on the protective member.

[0017] In one embodiment, a plurality of receiving grooves corresponding to the protective member are provided on the upper box cover, and the receiving grooves are engaged with the top of the upper blocking portion;

[0018] Alternatively, a U-shaped fixing piece is provided on the upper box cover, and the opening of the U-shaped fixing piece faces the lower box body to form a receiving groove for being engaged with the top of the upper blocking part.

[0019] In one of the embodiments, the flat explosion-proof battery pack further includes a box body, the plane where the explosion-proof valve is located is perpendicular to the bottom surface or the top surface of the box body, and the protective member is a high temperature resistant protective member.

[0020] A vehicle comprises the flat-laying explosion-proof battery pack as described above.

[0021] In one embodiment, the vehicle includes a chassis, and the surface where the explosion-proof valve is located is perpendicular to the surface where the chassis is located.

[0022] The above-mentioned flat explosion-proof battery pack and vehicle include a box; a plurality of battery pairs, the battery pairs are arranged in the box, each battery pair includes a first battery assembly and a second battery assembly arranged oppositely, and the first battery assembly and the second battery assembly are provided with explosion-proof valves for providing a jet flow path on the side walls arranged oppositely; a protective member, the protective member is arranged in the box and located between the first battery assembly and the second battery assembly, and the protective member includes a curved portion facing the explosion-proof valve corresponding to the first battery assembly and the explosion-proof valve corresponding to the second battery assembly. When the battery assembly is thermally runaway, the flaming particles ejected from the explosion-proof valve impact the curved portion at a certain angle. Since the curved surface can disperse the impact force compared to the straight surface, the impact of the flaming particles on the protective member is reduced; at the same time, the curved portion increases the contact area with the flaming particles, further reducing the impact of the flaming particles on the protective member. By improving the shape of the protective member, the ability of the protective member to withstand the high-speed impact of high-temperature flaming particles is greatly improved, and the possibility of the protective member being damaged is effectively reduced, thereby ensuring the barrier effect of the protective member on the flaming particles, and then ensuring the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of the explosion structure of a flat explosion-proof battery pack;

[0024] FIG2 is a schematic diagram of an exploded structure of a battery pair when the curved surface portion is a concave arc surface in one embodiment;

[0025] FIG3 is a schematic diagram of an exploded structure of a battery pair when the curved surface portion is a convex arc surface in one embodiment;

[0026] FIG4 is a cross-sectional view of the battery pair corresponding to FIG2;

[0027] FIG5 is an enlarged structural schematic diagram of part A in FIG4 ;

[0028] FIG6 is a cross-sectional view of the battery pair corresponding to FIG3;

[0029] FIG. 7 is a schematic diagram of the overall structure of the vehicle.

[0030] Explanation of the reference numerals: 100, battery pack; 200, battery pair; 201, first battery assembly; 202, second battery assembly; 203, explosion-proof valve; 204, battery cell; 205, end plate; 206, fastener; 207, electrode column; 300, protective member; 301, curved portion; 302, upper barrier portion; 303, lower barrier portion; 401, lower box body; 402, upper box cover; 403, support beam; 404, raised column; 405, receiving groove; 406, mounting groove; 500, chassis. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] Referring to FIG. 1 , FIG. 1 shows an explosion schematic diagram of a flat-laid explosion-proof battery pack in an embodiment of the present application. The flat-laid explosion-proof battery pack 100 provided in an embodiment of the present application includes: a box body; a plurality of battery pairs 200 (as shown in FIG. 2 ), the battery pairs 200 are arranged in the box body, each battery pair 200 includes a first battery assembly 201 and a second battery assembly 202 arranged oppositely, and the first battery assembly 201 and the second battery assembly 202 are arranged on oppositely arranged side walls. The explosion-proof valve 203 for providing a flow path for the jet includes high-pressure gas, flames, burning particles, etc. ejected from the explosion-proof valve due to the rupture of the explosion-proof valve; a protective member 300, the protective member 300 is arranged in the box body and is located between the first battery assembly 201 and the second battery assembly 202, and the protective member 300 includes a curved portion 301 facing the explosion-proof valve 203 corresponding to the first battery assembly 201 and the explosion-proof valve 203 corresponding to the second battery assembly 202.

[0038] The flat explosion-proof battery pack 100 is flat as a whole, and its outermost layer is a box body, which is used to protect the internal battery pair 200 structure. Several battery pairs 200 are arranged side by side in the flat box body, and each battery pair 200 includes two battery assemblies of the same structure. For the convenience of description, the two battery assemblies in the same battery pair 200 are respectively referred to as the first battery assembly 201 and the second battery assembly 202.

[0039] The first battery assembly 201 and the second battery assembly 202 both include side walls provided with explosion-proof valves 203, and the side walls provided with explosion-proof valves 203 of the first battery assembly 201 and the second battery assembly 202 are arranged opposite to each other. The explosion-proof valve 203 is usually a sheet-like structure, which is destroyed when the internal pressure of the battery is too high, forming a flow path to release the internal pressure of the battery, thereby preventing thermal runaway from causing battery explosion.

[0040] When thermal runaway occurs in a battery assembly, flaming particles, high-pressure gas, flames, etc. will be ejected from the explosion-proof valve 203. In order to prevent the flaming particles ejected from one battery assembly in the battery pair 200 from causing thermal runaway of another battery assembly, and then causing the battery pack 100 to explode, a protective member 300 is provided between the first battery assembly 201 and the second battery assembly 202. The flaming particles ejected from the explosion-proof valve 203 will directly impact the protective member 300 and absorb part of the energy during the collision, thereby isolating the flaming particles, effectively avoiding further spread of thermal runaway, reducing the probability of explosion of the battery pack 100, and improving battery safety.

[0041] To further ensure the barrier effect of the protective member 300, as shown in Figures 2 and 3, the protective member 300 includes a curved surface 301, and the surfaces of the curved surface 301 facing the first battery assembly 201 and the second battery assembly 202 are all curved surfaces. When the battery assembly is thermally runaway, the flaming particles ejected from the explosion-proof valve 203 impact the curved surface 301 at a certain angle. Since the curved surface can disperse the impact force compared to the straight surface, the impact of the flaming particles on the protective member 300 is reduced; at the same time, the curved surface 301 increases the contact area with the flaming particles, further reducing the impact of the flaming particles on the protective member 300. By improving the shape of the protective member 300, the ability of the protective member 300 to withstand the high-speed impact of high-temperature flaming particles is greatly improved, and the possibility of the protective member 300 being damaged is effectively reduced, thereby ensuring the barrier effect of the protective member 300 on the flaming particles, and further ensuring the safety of the battery.

[0042] As shown in FIG. 2 , in one embodiment, the curved surface portion 301 is a concave arc surface.

[0043] After being ejected from the explosion-proof valve 203, the flaming particles are dispersed toward the center by the concave arc surface, thereby reducing the impact of the flaming particles on the protective member 300. In addition, after being reflected by the concave arc surface, the flaming particles have a reduced chance of rebounding in the direction of the explosion-proof valve, further reducing energy accumulation (the dispersion effect is shown in FIG4 ).

[0044] As shown in FIG. 3 , in one embodiment, the curved surface portion 301 is a convex arc surface.

[0045] After being ejected from the explosion-proof valve 203, the flaming particles are dispersed toward the edge by the convex arc surface, thereby reducing the impact of the flaming particles on the protective member 300, and the flaming particles are reflected by the concave arc surface, reducing the probability of rebounding back to the direction of the explosion-proof valve, further reducing the accumulation of energy (the dispersion effect is shown in Figure 6).

[0046] In one of the embodiments, as shown in Figures 2 and 3, the first battery assembly 201 and the second battery assembly 202 both include a plurality of battery cells 204 stacked along the first direction and / or the second direction, and each battery cell 204 includes an explosion-proof valve 203; the number of battery cells 204 in the first battery assembly 201 and the battery cells 204 in the second battery assembly 202 are the same and are stacked in the same manner; along the first direction, the curvature of the curved surface portion 301 at the same position in the second direction is consistent; wherein, as shown in Figures 2 and 3, the first direction is the length direction of the explosion-proof valve 203 distribution area, and the second direction is the width direction of the explosion-proof valve 203 distribution area.

[0047] The first battery assembly 201 and the second battery assembly 202 both include a plurality of battery cells 204, each of which is provided with an explosion-proof valve 203 and positive and negative electrodes, the explosion-proof valve 203 and the positive and negative electrodes are coplanar, and the explosion-proof valves 203 of each battery cell 204 are coplanar. The positive and negative electrodes are the positive and negative pole pieces of the battery cell 204, the pole pieces of the battery are assembled according to a winding structure and a stacked structure, and a diaphragm is provided between the positive and negative pole pieces, the diaphragm is an insulating film, electrons cannot pass through the diaphragm, but ions can pass through the diaphragm.

[0048] The battery cells 204 in the first battery assembly 201 and the second battery assembly 202 are stacked in the vertical direction and / or in the horizontal direction. The number of battery cells 204 in the first battery assembly 201 and the second battery assembly 202 is the same and the stacking method is the same, so the first battery assembly 201 and the second battery assembly 202 are axially symmetrical structures. The first battery assembly 201 and the second battery assembly 202 are bonded with end plates 205 at both ends, and then the end plates 205 and a plurality of battery cells 204 are combined to form a battery assembly using fasteners 206. The fasteners 206 can be a polyethylene strapping tape or a steel strap.

[0049] Since the explosion-proof valves 203 corresponding to the battery cells 204 on the same battery assembly are all coplanar, the explosion-proof valve 203 distribution area is used as a reference plane, and its length direction is regarded as the first direction and the width direction is regarded as the second direction. Along the first direction, the curvature of the curved surface 301 at the same position in the second direction is consistent. The axial direction of the protective member 300 is parallel to the first direction.

[0050] In this embodiment, the shape of the curved surface portion 301 is limited so that the structural size of the protective member 300 is controlled within a certain range, thereby ensuring that the size of the battery pack 100 is within a controllable range.

[0051] As shown in Figures 2 and 3, in one embodiment, the protective member 300 also includes an upper barrier portion 302 and a lower barrier portion 303, and the top of the curved portion 301 is connected to the middle of the upper barrier portion 302, and the bottom of the curved portion 301 is connected to the middle of the lower barrier portion 303, and the upper barrier portion 302, the curved portion 301 and the lower barrier portion 303 form an "I"-shaped structure, and the flaming particles and other objects ejected from the explosion-proof valve 203 are confined in the cavity on both sides of the "I"-shaped structure, preventing the flaming particles and other objects from scattering; and the upper barrier portion 302, the curved portion 301 and the lower barrier portion 303 extend along the first direction.

[0052] As shown in FIG. 4 and FIG. 6 , the end surfaces of the upper barrier portion 302 and the end surfaces of the lower barrier portion 303 respectively abut against the side walls of the first battery assembly 201 and the second battery assembly 202 that are arranged opposite to each other; that is, the curved surface portion 301, the upper barrier portion 302 and the lower barrier portion 303 form a closed structure with the side walls of the first battery assembly 201 and the second battery assembly 202, and the flaming particles and other objects ejected from the explosion-proof valve 203 are restricted in the closed structure and can only move in the first direction, thereby ensuring that the flaming particles will not be ejected from the upper or lower part of the battery pack 100 to endanger the safety of passengers. In an alternative technical solution, the bottom surfaces of the upper barrier portion 302 and the top surfaces of the lower barrier portion 303 partially abut against the upper and lower surfaces of the first battery assembly 201 and the second battery assembly 302, respectively.

[0053] In one embodiment, the box body includes a lower box body 401 and an upper box cover 402; a plurality of support beams 403 corresponding to the protective member 300 are arranged on the inner bottom wall of the lower box body 401, and a plurality of protruding columns 404 are arranged on each support beam 403; a plurality of mounting grooves 406 corresponding to the protruding columns 404 are arranged on the protective member 300.

[0054] As shown in FIG1 , the box body includes a lower box body 401 and an upper box cover 402, and the lower box body 401 and the upper box cover 402 are sealed and buckled together. The inner bottom wall of the lower box body 401 is parallel to the largest plane of the flat box body, and a plurality of support beams 403 are distributed on the inner bottom wall of the lower box body 401 to improve the structural stability of the box body. The support beams 403 serve as the installation and support base of the protective member 300, correspond to the protective member 300 one by one, and their axial direction is parallel to the axial direction of the protective member 300.

[0055] As shown in Figures 4 and 5, Figure 4 is a cross-sectional view of the battery assembly perpendicular to the axial direction of the protective member 300, the curved portion 301 in Figure 4 is a concave arc surface, and Figure 5 is an enlarged structural schematic diagram of part A in Figure 4. A plurality of protruding columns 404 are arranged on the support beam 403 along its axial direction, and a plurality of mounting grooves 406 corresponding to the protruding columns 404 are arranged on the protective member 300. The mounting grooves 406 on the protective member 300 are engaged with the corresponding protruding columns 404 on the support beam 403, thereby completing the fixed installation of the protective member 300.

[0056] In this embodiment, a first battery assembly 201 and a second battery assembly 202 belonging to different battery pairs 200 are distributed between two adjacent installation grooves 406, and the surfaces where the explosion-proof valves 203 of these two battery assemblies are located are opposite to each other to reduce the mutual influence of thermal runaway of adjacent first battery assemblies 201 and second battery assemblies 202 of different battery pairs 200.

[0057] In one embodiment, a plurality of receiving grooves 405 corresponding to the protective member 300 are disposed on the upper box cover 402 , and the receiving grooves 405 are engaged with the top of the upper blocking portion 302 .

[0058] As shown in Fig. 4, the upper box cover 402 is provided with a plurality of receiving grooves 405 corresponding to the protective member 300. When the upper blocking portion 302 is engaged with the receiving grooves 405, the upper box cover 402 is closed, so that the protective member 300 is installed more firmly.

[0059] In one embodiment, a U-shaped fixing piece is disposed on the upper box cover 402 , and the opening of the U-shaped fixing piece faces the lower box body 401 , forming a receiving groove 405 for engaging with the upper blocking portion 302 .

[0060] The receiving groove 405 can be realized by using a U-shaped fixing piece, and the U-shaped fixing piece with the opening facing downwardly toward the box body 401 is fixed on the upper box cover 402, or is integrally formed with the upper box cover 402 to form the receiving groove 405 for the protective member 300 to be embedded.

[0061] In order to improve the structural stability of the U-shaped fixing member and ensure that the protective member 300 is firmly installed, the U-shaped fixing member can be made of metal material, such as iron, alloy, stainless steel, etc.

[0062] As shown in Figure 6, it is a cross-sectional view of the battery assembly perpendicular to the axial direction of the protective member 300 when the curved portion 301 is a concave curved surface. When the curved portion 301 is a concave curved surface, the fixing structure of the protective member 300 is the same as that when the curved portion 301 is a convex curved surface, and will not be repeated here.

[0063] In one of the embodiments, the plane where the explosion-proof valve 203 is located is perpendicular to the bottom surface or the top surface of the box body, and the protective member 300 is a high temperature resistant protective member 300 .

[0064] Since the temperature of the flaming particles ejected through the explosion-proof valve 203 is relatively high, in order to ensure that the protective member 300 can effectively block the flaming particles, the protective member 300 needs to have good high temperature resistance. On the one hand, starting from the material of the protective member 300 itself, mica, ceramics and other materials can be used; on the other hand, coatings can also be used to enhance the tolerance of the protective member 300 to high temperatures, such as coating the curved surface 301 with refractory ceramic coatings. In addition, the protective member 300 itself can be made of metal components, and then refractory ceramic coatings are coated on its surface, which can not only enhance the strength of the protective member 300, but also ensure its good high temperature resistance, thereby effectively ensuring the barrier effect of the protective member 300 on flaming particles and reducing the possibility of thermal runaway of the battery.

[0065] The present application proposes a flat-type explosion-proof battery pack 100. By optimizing the protective member 300 facing the explosion-proof valve 203 of the battery cell 204 into a curved surface, the impact of the flaming particles ejected from the explosion-proof valve 203 on the protective member 300 during thermal runaway of the battery can be reduced, thereby improving the safety of the protective member 300 under the impact of flaming particles and further improving the safety of the battery.

[0066] In one of the embodiments, a vehicle is disclosed, comprising the horizontal explosion-proof battery pack 100 in the above-mentioned embodiment.

[0067] Among them, the flat explosion-proof battery pack 100 includes a box body; a plurality of battery pairs 200, the battery pairs 200 are arranged in the box body, each battery pair 200 includes a first battery assembly 201 and a second battery assembly 202 arranged oppositely, and the first battery assembly 201 and the second battery assembly 202 are arranged on the opposite side walls. Explosion-proof valves 203 for providing a high-pressure gas flow path are provided; a protective member 300, the protective member 300 is arranged in the box body and is located between the first battery assembly 201 and the second battery assembly 202, and the protective member 300 includes a curved portion 301 facing the explosion-proof valve 203 corresponding to the first battery assembly 201 and the explosion-proof valve 203 corresponding to the second battery assembly 202.

[0068] In one embodiment, the curved surface portion 301 is a concave arc surface.

[0069] In one embodiment, the curved surface portion 301 is a convex arc surface.

[0070] In one embodiment, the first battery assembly 201 and the second battery assembly 202 both include a plurality of battery cells 204, each of which includes an explosion-proof valve 203; the number of battery cells 204 in the first battery assembly 201 is the same as that in the second battery assembly 202 and they are stacked in the same manner;

[0071] Along the first direction, the curvature of the curved surface portion 301 at the same position in the second direction is consistent; wherein the first direction is the length direction of the explosion-proof valve 203 distribution area, and the second direction is the width direction of the explosion-proof valve 203 distribution area.

[0072] The protective member 300 also includes an upper blocking portion 302 and a lower blocking portion 303. The top of the curved portion 301 is connected to the middle of the upper blocking portion 302, and the bottom of the curved portion 301 is connected to the middle of the lower blocking portion 303. The upper blocking portion 302, the curved portion 301 and the lower blocking portion 303 extend along the first direction.

[0073] In one embodiment, the end surfaces of the upper barrier portion 302 and the end surfaces of the lower barrier portion 303 respectively abut against the side walls of the first battery assembly 201 and the second battery assembly 202 that are opposite to each other; or, the bottom surfaces of the upper barrier portion 302 and the top surfaces of the lower barrier portion 303 partially abut against the upper surface and the lower surface of the first battery assembly 201 and the second battery assembly 202 respectively.

[0074] In one embodiment, the box body includes a lower box body 401 and an upper box cover 402;

[0075] A plurality of support beams 403 corresponding to the protective member 300 are arranged on the inner bottom wall of the lower box body 401 , and a plurality of protruding columns 404 are arranged on each support beam 403 ; a plurality of mounting grooves 406 corresponding to the protruding columns 404 are arranged on the protective member 300 .

[0076] In one embodiment, a plurality of receiving grooves 405 corresponding to the protective member 300 are disposed on the upper box cover 402 , and the receiving grooves 405 are engaged with the top of the upper blocking portion 302 .

[0077] In one embodiment, a U-shaped fixing piece is disposed on the upper box cover 402 , and the opening of the U-shaped fixing piece faces the lower box body 401 , forming a receiving groove 405 for engaging with the protective piece 300 .

[0078] In one embodiment, the protective member 300 is a high temperature resistant protective member 300 .

[0079] When the battery assembly is in thermal runaway, the flammable particles ejected from the explosion-proof valve 203 impact the curved surface 301 at a certain angle. Since the curved surface can disperse the impact force compared to the straight surface, the impact of the flammable particles on the protective member 300 is reduced; at the same time, the curved surface 301 increases the contact area with the flammable particles, further reducing the impact of the flammable particles on the protective member 300. By improving the shape of the protective member 300, the ability of the protective member 300 to withstand the high-speed impact of high-temperature flammable particles is greatly improved, and the possibility of the protective member 300 being damaged is effectively reduced, thereby ensuring the barrier effect of the protective member 300 on the flammable particles, and further ensuring the safety of the battery.

[0080] In one embodiment, the vehicle includes a chassis 500 , and the surface where the explosion-proof valve 203 is located is perpendicular to the surface where the chassis 500 is located.

[0081] Usually, the surface of the automobile chassis 500 can be regarded as a horizontal plane. Since the plane where the explosion-proof valve 203 is located is perpendicular to the horizontal plane, the energy, flame or flaming particles released by the battery after the explosion-proof valve 203 ruptures will not directly face the passengers above the automobile chassis 500, thereby ensuring the personal safety of the passengers.

[0082] 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.

[0083] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. 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 application shall be subject to the attached claims.

Claims

1. A flat explosion-proof battery pack, characterized in that: include: A plurality of battery pairs (200), each of the battery pairs (200) comprising a first battery assembly (201) and a second battery assembly (202) arranged opposite to each other, and explosion-proof valves (203) for providing a flow path for the jet are provided on the oppositely arranged side walls of the first battery assembly (201) and the second battery assembly (202); A protective member (300), the protective member (300) is located between the first battery assembly (201) and the second battery assembly (202), and the protective member (300) includes a curved surface portion (301) facing the first battery assembly (201) corresponding to the explosion-proof valve (203) and the second battery assembly (202) corresponding to the explosion-proof valve (203).

2. The horizontal explosion-proof battery pack according to claim 1, characterized in that: The curved surface portion (301) includes a convex curved surface and / or a concave curved surface.

3. The horizontal explosion-proof battery pack according to any one of claims 1 to 2, characterized in that: The first battery assembly (201) and the second battery assembly (202) both include a plurality of battery cells (204) stacked along a first direction and / or a second direction, and each of the battery cells (204) includes the explosion-proof valve (203); The first direction is the length direction of the explosion-proof valve (203) distribution area, and the second direction is the width direction of the explosion-proof valve (203) distribution area.

4. The horizontal explosion-proof battery pack according to claim 3, characterized in that: The protective member (300) further comprises an upper blocking portion (302) and a lower blocking portion (303), the top end of the curved surface portion (301) being connected to the middle of the upper blocking portion (302), and the bottom end of the curved surface portion (301) being connected to the middle of the lower blocking portion (303); The upper blocking portion (302), the curved surface portion (301) and the lower blocking portion (303) extend along the first direction.

5. The horizontal explosion-proof battery pack according to claim 4, characterized in that: The end surfaces of both ends of the upper barrier portion (302) and the end surfaces of both ends of the lower barrier portion (303) are respectively abutted against the side walls of the first battery assembly (201) and the second battery assembly (202) which are arranged opposite to each other; Alternatively, the bottom surfaces at both ends of the upper barrier portion (302) and the top surfaces at both ends of the lower barrier portion (303) partially abut against the upper surface and the lower surface of the first battery assembly (201) and the second battery assembly (202), respectively.

6. The horizontal explosion-proof battery pack according to claim 4, characterized in that: The flat-type explosion-proof battery pack also includes a box body, in which the plurality of battery pairs (200) are stored, and the box body includes a lower box body (401) and an upper box cover (402); A plurality of support beams (403) corresponding to the protective member (300) are arranged on the inner bottom wall of the lower box body (401), and a plurality of protruding columns (404) are arranged on each of the support beams (403); and a plurality of mounting grooves (406) corresponding to the protruding columns (404) are arranged on the protective member (300).

7. The horizontal explosion-proof battery pack according to claim 6, characterized in that: The upper box cover (402) is provided with a plurality of receiving grooves (405) corresponding to the protective member (300), and the receiving grooves (405) are engaged with the top of the upper blocking portion (302); Alternatively, a U-shaped fixing piece is provided on the upper box cover (402), and the opening of the U-shaped fixing piece faces the lower box body (401), forming the receiving groove (405) for engaging with the top of the upper blocking portion (302).

8. The horizontal explosion-proof battery pack according to claim 1, characterized in that: The flat-type explosion-proof battery pack also includes a box body, and the plane where the explosion-proof valve (203) is located is perpendicular to the bottom surface or the top surface of the box body.

9. A vehicle, characterized in that: It comprises a horizontally placed explosion-proof battery pack (100) as claimed in any one of claims 1 to 8.

10. The vehicle according to claim 9, characterized in that The vehicle comprises a chassis (500), and the surface where the explosion-proof valve (203) is located is perpendicular to the surface where the chassis (500) is located.

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