Battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack which comprises a box body, a plurality of single batteries, a partition plate, a pressure relief supporting assembly and a first supporting piece, and the multiple single batteries form a first battery pack and a second battery pack; the first battery pack and the second battery pack are stacked in the box body along the vertical direction; the partition plate is arranged between the first battery pack and the second battery pack, and one end of an anti-explosion valve arranged on each single battery in the first battery pack and the second battery pack faces the partition plate; the pressure relief supporting assembly comprises at least one pressure relief supporting plate, the pressure relief supporting plate is used for supporting the single battery, and the pressure relief supporting plate is arranged in the first pressure relief space and / or the second pressure relief space; the first supporting piece is arranged on the side wall of the box body and located in the first pressure relief space, and the first supporting piece is supported on the large surface of the partition plate.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular, to a battery pack. Background Art

[0002] In electric vehicles, a battery pack is often provided. The battery pack is used to provide power for the electric vehicle, and a plurality of single cells are arranged in the battery pack. With the development and progress of technology, people's requirements for the endurance of electric vehicles are getting higher and higher, which also puts higher and higher requirements on the energy density of the battery pack. In the related art, the space utilization rate in the battery pack box is relatively low, which is not conducive to improving the energy density of the battery pack.

[0003] It should be noted that the information disclosed in the above background art is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a battery pack, so as to at least to a certain extent improve the space utilization rate inside the battery pack, and further improve the energy density of the battery pack.

[0005] The present disclosure provides a battery pack, which includes:

[0006] A box body;

[0007] A plurality of single cells, the plurality of single cells form a first battery group and a second battery group, the first battery group and the second battery group are stacked in the box body in the vertical direction, and the first battery group and the second battery group are arranged at intervals;

[0008] A partition board, the partition board is arranged between the first battery group and the second battery group, one end of the explosion-proof valve arranged on the single cells in the first battery group and the second battery group faces the partition board, a first pressure relief space is formed between the partition board and the first battery group, and a second pressure relief space is formed between the partition board and the second battery group;

[0009] A pressure relief support assembly, the pressure relief support assembly includes at least one pressure relief support plate, the pressure relief support plate is used to support the single cells, and the pressure relief support plate is arranged in the first pressure relief space and / or the second pressure relief space;

[0010] A first support member, the first support member is arranged on the side wall of the box body and is located in the first pressure relief space, and the first support member supports the large surface of the partition board.

[0011] The battery pack provided by the embodiments of the present disclosure includes a box body, a plurality of single cells, a partition board, a pressure relief support assembly, and a first support member. The plurality of single cells form a first battery group and a second battery group. The first battery group and the second battery group are stacked in the box body, and there is a gap between the first battery group and the second battery group. The partition board is arranged between the first battery group and the second battery group. A first pressure relief space is formed between the partition board and the first battery group, and a second pressure relief space is formed between the partition board and the second battery group. The pressure relief support assembly includes at least one pressure relief support board, and the pressure relief support board is used to support the single cells. The first support member is arranged in the first pressure relief space, and one large surface of the first support member abuts against the partition board. By supporting the partition board with the first support member, the functions of positioning and absorbing assembly tolerances are achieved, and the force on the pressure relief space is concentrated. The first support member is provided to strengthen the strength of the partition board, avoiding the failure of the partition board during pressure relief and unable to play the original supporting role. Further, by arranging the first support member in the first pressure relief space, it is avoided to set a special space in the box body for accommodating the first support member, improving the space utilization rate in the battery pack, and thus being beneficial to improving the energy density of the battery pack.

[0012] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 FIG. is a schematic structural diagram of a battery pack provided by an exemplary embodiment of the present disclosure;

[0015] Figure 2 FIG. is a partially enlarged view of a battery pack provided by an exemplary embodiment of the present disclosure;

[0016] Figure 3 FIG. is a schematic structural diagram of a single cell provided by an exemplary embodiment of the present disclosure.

[0017] DESCRIPTION OF THE REFERENCE NUMERALS

[0018] 10. Box body; 11. Bottom plate; 12. Frame; 20. Single cell; 201. Battery housing; 202. Battery core; 203. Terminal; 204. Explosion-proof valve; 21. First battery group; 22. Second battery group; 30. Partition board; 40. Pressure relief support assembly; 41. First pressure relief support board; 42. Second pressure relief support board; 51. First support member; 52. Second support member. Detailed implementation manners

[0019] The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the protection scope of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the protection scope of the present disclosure.

[0020] In the description of the present disclosure, unless otherwise clearly defined and limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "plurality" means two or more; the term " / and" includes any combination and all combinations of one or more of the associated listed items. In particular, the mention of "the / this" object or "one" object is also intended to mean one of the possible multiple such objects.

[0021] Unless otherwise specified or described, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0022] Furthermore, in the description of the present disclosure, it should be understood that the orientation terms such as "upper", "lower", "inner", "outer", etc. described in the exemplary embodiments of the present disclosure are described from the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of the present disclosure. It should also be understood that in the context, when it is mentioned that an element or feature is connected "above", "below", or "inside", "outside" another element (one or more), it can not only be directly connected "above", "below", or "inside", "outside" another element (one or more), but also be indirectly connected "above", "below", or "inside", "outside" another element (one or more) through an intermediate element.

[0023] The exemplary embodiments of the present disclosure provide a battery pack, such as Figure 1 , Figure 2 and Figure 3As shown in the figure, the battery pack includes: a box body 10, a plurality of single cells 20, a partition 30, a pressure relief support assembly 40, and a first support member 51. The plurality of single cells 20 form a first battery group 21 and a second battery group 22. The first battery group 21 and the second battery group 22 are stacked in the box body 10 in the vertical direction (Z direction), and the first battery group 21 and the second battery group 22 are arranged at intervals. The partition 30 is arranged between the first battery group 21 and the second battery group 22. One end of the explosion-proof valve 204 provided on the single cells 20 in the first battery group 21 and the second battery group 22 faces the partition 30. A first pressure relief space is formed between the partition 30 and the first battery group 21, and a second pressure relief space is formed between the partition 30 and the second battery group 22. The pressure relief support assembly 40 includes at least one pressure relief support plate for supporting the single cells 20, and the pressure relief support plate is arranged in the first pressure relief space and / or the second pressure relief space. The first support member 51 is arranged on the side wall of the box body 10 and is located in the first pressure relief space. The first support member 51 supports the large surface of the partition 30.

[0024] The battery pack provided by the embodiment of the present disclosure includes a box body 10, a plurality of single cells 20, a partition 30, a pressure relief support assembly 40, and a first support member 51. The plurality of single cells 20 form a first battery group 21 and a second battery group 22. The first battery group 21 and the second battery group 22 are stacked in the box body 10, and there is an interval between the first battery group 21 and the second battery group 22. The partition 30 is arranged between the first battery group 21 and the second battery group 22. A first pressure relief space is formed between the partition 30 and the first battery group 21, and a second pressure relief space is formed between the partition 30 and the second battery group 22. The pressure relief support assembly 40 includes at least one pressure relief support plate for supporting the single cells 20. The first support member 51 is arranged in the first pressure relief space. The first support member 51 abuts against a large surface of the partition 30. By supporting the partition 30 with the first support member 51, the functions of positioning and absorbing assembly tolerances are achieved. Moreover, the force in the pressure relief space is concentrated. The first support member 51 is provided to strengthen the strength of the partition 30, avoiding the failure of the partition 30 during pressure relief and unable to play the original supporting role. Further, by arranging the first support member 51 in the first pressure relief space, it is avoided to set a special space for accommodating the first support member 51 in the box body 10, improving the space utilization rate inside the battery pack, and thus being beneficial to improving the energy density of the battery pack.

[0025] The following will detail each part of the battery pack provided by the embodiment of the present disclosure:

[0026] The box body 10 is used to form the outer contour of the battery pack and protect the components inside the box body 10. The box body 10 includes a bottom plate 11 and a frame 12. The frame 12 and the bottom edge are connected to form a battery compartment for accommodating the batteries. The single cells 20, the partition 30, the first support member 51, and the pressure relief support assembly 40 are all arranged in the battery compartment.

[0027] Among them, the frame 12 can be formed by a plurality of side beams connected end to end. In the embodiments of the present disclosure, the side wall of the box body 10 is the inner wall of the side beam. For example, the frame 12 can include a first side beam, a second side beam, a third side beam, and a fourth side beam that are connected end to end in sequence. The first support member 51 can be disposed on one or more of the first side beam, the second side beam, the third side beam, and the fourth side beam.

[0028] Optionally, the box body 10 can further include a box cover. The bottom plate 11 and the frame 12 form a lower box body, and the box cover is disposed on the lower box body. The box cover and the lower box body can be hermetically connected. For example, a sealing ring is disposed between the box cover and the top surface of the frame 12. Of course, in actual applications, the box body 10 may not have a box cover. When the battery pack is directly installed on the vehicle body structure, the vehicle body structure serves as the box cover. The embodiments of the present disclosure are not limited thereto.

[0029] It should be noted that the box body 10 provided in the embodiments of the present disclosure can not only include a battery compartment for accommodating batteries, but also, in some embodiments, an electrical component compartment for accommodating electrical components can be provided in the box body 10. The electrical component compartment and the battery compartment are adjacent, and the electrical component compartment and the battery compartment can be separated by a partition beam.

[0030] A plurality of single cells 20 form a first battery group 21 and a second battery group 22. The first battery group 21 and the second battery group 22 are stacked in the vertical direction in the box body 10, and the first battery group 21 and the second battery group 22 are spaced apart. That is, there is a gap between the first battery group 21 and the second battery group 22, and this gap can be used as a pressure relief space when a single cell 20 has a thermal runaway.

[0031] The first battery group 21 includes a plurality of first single cells. An explosion-proof valve 204 is disposed at one end of the first single cell facing the partition 30. The plurality of first single cells in the first battery group 21 can be arranged in an array, and the plurality of first single cells are aligned (the bottom surfaces and the top surfaces of the plurality of first single cells are aligned).

[0032] The second battery group 22 includes a plurality of second single cells. An explosion-proof valve 204 is disposed at one end of the second single cell facing the partition 30. The plurality of second single cells in the second battery group 22 can be arranged in an array, and the plurality of second single cells are aligned (the bottom surfaces and the top surfaces of the plurality of second single cells are aligned).

[0033] In the embodiments of the present disclosure, the first single cell and the second single cell are only named for convenience of description, and do not represent that the first single cell and the second single cell are different. That is, both the first single cell and the second single cell are ordinary single cells 20.

[0034] The single cell 20 may include a cell housing 201, a battery cell 202, and a terminal 203. The cell housing 201 is used to form the outer contour of the single cell 20 and protect the components within the cell housing 201. A receiving space is provided within the cell housing 201, the battery cell 202 is disposed within this receiving space, the terminal 203 is provided on the cell housing 201, and the terminal 203 is connected to the battery cell 202.

[0035] The cell housing 201 may include a housing main body and a cover plate. One end of the housing main body has an opening, and the cover plate is connected to the opening of the housing main body. The housing main body may include a bottom wall and a side frame. The bottom wall and the cover plate are disposed opposite to each other. The side frame is a cylindrical structure with openings at both ends, and the bottom wall and the cover plate are respectively connected to both ends of this cylindrical structure.

[0036] The cover plate and the side frame are of a split molding structure, and the cover plate and the side frame can be connected by means such as welding, riveting, or adhesive bonding. The bottom wall and the side frame may be of an integral molding structure or a split molding structure. When the bottom plate 11 and the side frame are of an integral molding structure, the housing main body can be formed by means such as stamping or casting. When the bottom plate 11 and the side frame are of a split molding structure, the housing main body can be formed by means such as welding, riveting, or adhesive bonding.

[0037] The battery cell 202 is disposed within the cell housing 201. The battery cell 202 is connected to the terminal 203, and the battery cell 202 is immersed in the electrolyte. The battery cell 202 includes a battery cell main body and tabs. The tabs extend from the battery cell main body; there are two tabs on the battery cell main body, and the two tabs are respectively a first tab (positive tab) and a second tab (negative tab), and the first tab and the second tab can be respectively connected to corresponding adapters.

[0038] It should be noted that the battery cell main body may include more than two electrode plates, the tabs include more than two single-piece tabs, the single-piece tabs respectively extend from the electrode plates corresponding to them, the width of the single-piece tab is smaller than the width of the electrode plate, and multiple single-piece tabs are stacked to form the tab.

[0039] In one embodiment, the battery is a laminated battery, which is not only convenient for grouping but also can be processed into a battery with a longer length. The battery cell 202 is a laminated battery cell. The battery cell 202 has a first electrode plate, a second electrode plate having an opposite electrical property to the first electrode plate, and a separator disposed between the first electrode plate and the second electrode plate that are stacked with each other, so that multiple pairs of the first electrode plate and the second electrode plate are stacked to form the laminated battery cell.

[0040] Optionally, the battery cell 202 can be a wound battery cell, that is, the first electrode plate, the second electrode plate having an opposite electrical property to the first electrode plate, and the separator disposed between the first electrode plate and the second electrode plate are wound to obtain the wound battery cell.

[0041] In the embodiments of the present disclosure, the first single battery and the second single battery are both cylindrical batteries. The axis of the first single battery is arranged in the vertical direction, and the axis of the second single battery is arranged in the vertical direction. That is, a plurality of single batteries 20 are arranged in two layers vertically. The vertical arrangement of the single batteries 20 in two layers can effectively save the size of the battery pack in the non-height direction, which is beneficial to the flexible layout of the battery pack in an electric vehicle.

[0042] It can be understood that in some other embodiments, the single battery 20 can also be a quadrangular prism battery. The quadrangular prism battery can include a first pole column and a second pole column, the first pole column and the second pole column are respectively arranged on the surface of the battery housing 201, and the first pole column and the second pole column are respectively connected to the battery cell 202.

[0043] The partition 30 is arranged between the first battery group 21 and the second battery group 22. One end of the explosion-proof valve 204 provided on the single battery 20 in the first battery group 21 and the second battery group 22 faces the partition 30. A first pressure relief space is formed between the partition 30 and the first battery group 21, and a second pressure relief space is formed between the partition 30 and the second battery group 22. By separating the pressure relief spaces of the first battery group 21 and the second battery group 22 through the partition 30, it is possible to prevent the single battery 20 from affecting the opposite battery after thermal runaway, thereby suppressing the spread of thermal runaway.

[0044] The partition 30 can be a solid structural plate, or the partition 30 can also be a plate with a cavity inside. When there is a cavity in the partition 30, the partition 30 can include a first panel, a second panel and a side enclosure. The first panel and the second panel are arranged opposite to each other and there is a gap between the first panel and the second panel. The side enclosure at least partially surrounds the first panel and the second panel, thereby forming a cavity inside the partition 30.

[0045] In order to improve the strength and stability of the partition 30, reinforcing ribs can be arranged in the cavity of the partition 30. The reinforcing ribs can extend along the length direction of the partition 30, or the reinforcing ribs can extend along the width direction of the partition 30. Or the reinforcing ribs in the partition 30 can be arranged in a staggered manner. For example, there are a first reinforcing rib and a second reinforcing rib in the partition 30, and the extending directions of the first reinforcing rib and the second reinforcing rib intersect. The reinforcing ribs can be continuous or the reinforcing ribs can be discontinuous. When the reinforcing ribs are discontinuous, it can buffer the gas and liquid discharged from the battery when the cavity in the partition 30 is used as a pressure relief channel, and reduce the flow velocity.

[0046] The pressure relief support assembly 40 includes a first pressure relief support plate 41 and a second pressure relief support plate 42. The first pressure relief support plate 41 is arranged in the first pressure relief space and abuts against the first battery group 21; the second pressure relief support plate 42 is arranged in the second pressure relief space and abuts against the second battery group 22; the second battery group 22 is arranged on the side of the first battery group 21 away from the bottom plate 11, and the first support member 51 is arranged in the first pressure relief space, and the side of the first support member 51 away from the bottom plate 11 abuts against the partition 30.

[0047] The first pressure relief support plate 41 abuts against the single cell 20 in the first battery pack 21, and a groove can be set on the first pressure relief support plate 41 to install the single cell 20 in the groove. When the first single cell explodes due to thermal runaway, the high-pressure liquid breaks through the battery shell 201 and the first pressure relief support plate 41 and enters the first pressure relief space. The second pressure relief support abuts against the single cell 20 in the second battery pack 22, and a groove can be set on the second pressure relief support plate 42 to install the single cell 20 in the groove. When the second single cell explodes due to thermal runaway, the high-pressure liquid breaks through the battery shell 201 and the second pressure relief support plate 42 and enters the second pressure relief space.

[0048] The first support member 51 is provided on the side wall of the box body 10 (the inner wall of the side beam) and is located in the first pressure relief space. The first support member 51 is supported on the large surface of the partition 30 (the surface opposite to the partition 30 and the bottom plate 11 of the box body 10). The second support member 52 is provided in the second pressure relief space, and the second support member 52 abuts against the large surface of the partition 30. That is, the first support member 51 and the second support member 52 abut against the two large surfaces of the partition 30 respectively.

[0049] The first support member 51 and the side wall of the box body 10 are an integrally formed structure, and the first support member 51 extends along the length direction of the side wall of the box body 10. The cross-section of the first support member 51 is a right triangle. The first right-angled side of the first support member 51 is connected to the support partition 30, and the second right-angled side of the support member is connected to the side wall of the box body 10. The cross-section is perpendicular to the extension direction of the first support member 51.

[0050] By setting the cross-section of the first support member 51 to a right triangle, the first support member 51 can bear stronger force while being smaller in size, and can be formed simply by being extruded integrally with the side panel of the box body 10, and the assembly is simpler and more efficient. The triangle itself occupies the inclined space, making it impossible to place batteries in the area with the hypotenuse. The first support member 51 is set in the pressure relief space so as not to occupy more space, which is conducive to saving space.

[0051] Optionally, the second support member 52 and the side wall of the box body 10 are integrally formed, and the second support member 52 extends along the length direction of the side wall of the box body 10 , and the cross section of the second support member 52 is a right triangle. One right-angled side of the second support member 52 abuts against the large surface of the partition 30 .

[0052] The length of the first right-angled side of the first support member 51 is L1, the first height is H1, and 0.015 ≤ L1 / H1 ≤ 0.14. The first height is the sum of the thickness of the partition 30 and the height of the single battery 20. By 0.015 ≤ L1 / H1 ≤ 0.14, on the one hand, it avoids the first right-angled side of the first support member 51 being too long and occupying too much space inside the box body 10. On the other hand, it avoids the first right-angled side of the first support member 51 being too short, which may cause insufficient support strength and the problem that the partition 30 may slip off the first support member 51.

[0053] The length of the first right-angled side of the first support member 51 is L1, and the length of the second right-angled side of the first support member 51 is L2, 0.6 ≤ L1 / L2 ≤ 1, and 2 mm ≤ L1 ≤ 18.6 mm. By 0.6 ≤ L1 / L2 ≤ 1 and 2 mm ≤ L1 ≤ 18.6 mm, on the one hand, it avoids the problem of easy fatigue bending caused by too large a length ratio. On the other hand, it also avoids the problem that too small a length ratio occupies too much Z-direction space and is not conducive to the space utilization rate of the whole package, and the problem that the partition 30 may slip off.

[0054] A smooth transition part is formed between the first right-angled side and the second right-angled side of the first support member 51. For example, the first right-angled side and the second right-angled side of the first support member 51 are transitioned by a fillet. By providing a smooth transition part between the first right-angled side and the second right-angled side of the first support member 51, it avoids scratching the contents during the assembly process, and the support force of the sharp corner itself is not as good as that of the fillet. That is, the support performance of the first support member 51 is improved.

[0055] A first connection structure is provided on the first support member 51 and / or the partition 30, and the first connection structure is used to connect the first support member 51 and the partition 30. Through the first connection structure, the connection between the first support member 51 and the partition 30 is made more stable, preventing the partition 30 from vibrating and slipping off, and improving the overall package mode.

[0056] In a feasible implementation manner, the first connection structure can be an adhesive layer. The lower surface of the partition 30 is a plane, and the lower surface of the first support member 51 and the partition 30 are bonded. The lower surface of the partition 30 is the side of the partition 30 facing the first support member 51.

[0057] In another feasible implementation manner, the first connection structure is a clamping structure. A first clamping portion is provided on the first support member 51, and a second clamping portion is provided on the partition 30. The first clamping portion and the second clamping portion cooperate to realize the connection between the first support member 51 and the partition 30. That is, the partition 30 is not a flat plate structure, and in the projection on the reference plane of the side wall of the box body 10, there is a part where the projection of the partition 30 and the first support member 51 overlap.

[0058] The first clamping part and the second clamping part are shaped in imitation of each other. For example, if the first clamping part is a protrusion, then the second clamping part is a groove shaped in imitation. Or, if the first clamping part is a groove, then the second clamping part is a protrusion shaped in imitation.

[0059] A second connecting structure is provided on the second support member 52 and / or the second pressure relief support plate 42. The second connecting structure is used to connect the second support member 52 and the second pressure relief support plate 42. Through the second connecting structure, the connection between the second support member 52 and the second pressure relief support plate 42 is made more stable, preventing the partition plate 30 from vibrating and slipping off, and improving the overall package mode.

[0060] In a feasible embodiment, the second connecting structure can be an adhesive layer. The lower surface of the partition plate 30 is a plane, and the lower surfaces of the second support member 52 and the second pressure relief support plate 42 are bonded. The lower surface of the second pressure relief support plate 42 is the side of the second pressure relief support plate 42 facing the bottom plate 11.

[0061] In another feasible embodiment, the second connecting structure is a clamping structure. A third clamping part is provided on the second support member 52, and a fourth clamping part is provided on the second pressure relief support plate 42. The third clamping part and the fourth clamping part cooperate to realize the connection between the second support member 52 and the second pressure relief support plate 42. That is to say, the second pressure relief support plate 42 is not a flat plate structure, and there is a part of the projection that overlaps between the second pressure relief support plate 42 and the second support member 52 in the projection on the reference plane where the side wall of the box body 10 is located.

[0062] The third clamping part and the fourth clamping part are shaped in imitation of each other. For example, if the third clamping part is a protrusion, then the fourth clamping part is a groove shaped in imitation. Or, if the third clamping part is a groove, then the fourth clamping part is a protrusion shaped in imitation.

[0063] The battery pack provided by the embodiments of the present disclosure includes a box body 10, a plurality of single cells 20, a partition plate 30, a pressure relief support assembly 40, and a first support member 51. The plurality of single cells 20 form a first battery group 21 and a second battery group 22. The first battery group 21 and the second battery group 22 are stacked in the box body 10, and there is a gap between the first battery group 21 and the second battery group 22. The partition plate 30 is arranged between the first battery group 21 and the second battery group 22. A first pressure relief space is formed between the partition plate 30 and the first battery group 21, and a second pressure relief space is formed between the partition plate 30 and the second battery group 22. The pressure relief support assembly 40 includes at least one pressure relief support plate for supporting the single cells 20. The first support member 51 is arranged in the first pressure relief space and abuts against a large surface of the partition plate 30. By supporting the partition plate 30 with the first support member 51, the functions of positioning and absorbing assembly tolerances are achieved, and the force on the pressure relief space is concentrated. The first support member 51 is provided to strengthen the strength of the partition plate 30, avoiding the failure of the partition plate 30 during pressure relief and thus unable to play its original supporting role. Further, by arranging the first support member 51 in the first pressure relief space, it is avoided to set a dedicated space in the box body 10 for accommodating the first support member 51, improving the space utilization rate inside the battery pack, and thus being beneficial to improving the energy density of the battery pack.

[0064] The battery pack provided by the embodiments of the present disclosure can be applied to electric vehicles. The battery pack is installed on the electric vehicle to provide energy for the electric vehicle. In actual applications, the battery pack can be installed on the frame of the electric vehicle. The battery pack can be fixedly connected to the frame. Or the battery pack can be a modular battery pack, and the modular battery pack can be detachably connected to the vehicle body for easy replacement.

[0065] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include the common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A battery pack, characterized in that: The battery pack comprises: Box; A plurality of single cells, wherein the plurality of single cells form a first battery group and a second battery group, wherein the first battery group and the second battery group are stacked vertically in the box, and the first battery group and the second battery group are spaced apart; A partition, the partition is arranged between the first battery group and the second battery group, one end of the explosion-proof valve of the single battery in the first battery group and the second battery group is arranged toward the partition, a first pressure relief space is formed between the partition and the first battery group, and a second pressure relief space is formed between the partition and the second battery group; A pressure relief support assembly, the pressure relief support assembly comprising at least one pressure relief support plate, the pressure relief support plate being used to support the single battery, the first pressure relief space and / or the second pressure relief space being provided with the pressure relief support plate; A first support member is provided on the side wall of the box body and is located in the first pressure relief space. The first support member is supported on the large surface of the partition.

2. The battery pack according to claim 1, characterized in that: The pressure relief support assembly comprises: a first pressure relief support plate, the first pressure relief support plate being disposed in the first pressure relief space and abutting against the first battery pack; a second pressure relief support plate, the second pressure relief support plate being disposed in the second pressure relief space and abutting against the second battery pack; The box body includes a bottom plate, the second battery group is arranged on a side of the first battery group away from the bottom plate, the first support member is arranged in the first pressure relief space, and a side of the first support member away from the bottom plate abuts against the partition.

3. The battery pack according to claim 2, characterized in that: The battery pack further comprises: The second support member is arranged in the second pressure relief space, and the second support member abuts against the large surface of the partition.

4. The battery pack according to claim 1, wherein: The first support member and the side wall of the box body are an integrally formed structure, and the first support member extends along the length direction of the side wall of the box body. The cross-section of the first support member is a right-angled triangle. The first right-angled side of the first support member supports the partition, and the second right-angled side of the support member is connected to the side wall of the box body. The cross-section is perpendicular to the extension direction of the first support member.

5. The battery pack according to claim 4, characterized in that: The length of the first right-angle side of the first support member is L1, the first height is H1, 0.015≤L1 / H1≤0.14, and the first height is the sum of the thickness of the partition and the height of the single battery.

6. The battery pack according to claim 4, characterized in that: The length of the first right-angled side of the first support member is L1, the length of the second right-angled side of the first support member is L2, 0.6≤L1 / L2≤1, 2mm≤L1≤18.6mm.

7. The battery pack according to claim 4, characterized in that: A smooth transition portion is formed between the first right-angled side and the second right-angled side of the first support member.

8. The battery pack according to claim 1, wherein: The first support member and / or the partition plate is provided with a first connection structure, and the first connection structure is used to connect the first support member and the partition plate.

9. The battery pack according to claim 8, characterized in that: The lower surface of the partition is a plane, the first support member is bonded to the lower surface of the partition, and the lower surface of the partition is a side of the partition facing the first support member.

10. The battery pack according to claim 8, characterized in that: The first support member is provided with a first clamping portion, and the partition is provided with a second clamping portion. The first clamping portion cooperates with the second clamping portion to achieve connection between the first support member and the partition.

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