Battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack which comprises a first battery cluster, a second battery cluster and a protection plate, and the first battery cluster comprises at least one single battery; the second battery cluster comprises at least one single battery, the second battery cluster and the first battery cluster are stacked in the first direction, and a pressure relief space is formed between the first battery cluster and the second battery cluster; the protection plate is arranged in the pressure relief space and divides the pressure relief space into a first pressure relief sub-space and a second pressure relief sub-space, the first pressure relief sub-space is located between the first battery cluster and the protection plate, and the second pressure relief sub-space is located between the second battery cluster and the protection plate. A cavity is formed in the protection plate, and the anti-explosion valve of the single battery faces the protection plate.

Description

Technical Field

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

[0002] In electric vehicles, a battery pack is often provided, and the battery pack is used to provide power for the electric vehicle. A plurality of single cells are arranged in the battery pack, and an explosion-proof valve is arranged on the single cell. The explosion-proof valve on the single cell bursts after the battery thermal runaway to relieve pressure on the single cell. When the explosion-proof valve on the single cell bursts, it is likely to affect the batteries around the single cell, thereby causing the spread of thermal runaway.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus 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, thereby at least to a certain extent reducing the spread of thermal runaway in the battery pack.

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

[0006] A first battery cluster, the first battery cluster includes at least one single cell;

[0007] A second battery cluster, the second battery cluster includes at least one single cell, the second battery cluster and the first battery cluster are stacked along a first direction, and there is a pressure relief space between the first battery cluster and the second battery cluster;

[0008] A protection board, the protection board is arranged in the pressure relief space, separating the pressure relief space into a first sub-pressure relief space and a second sub-pressure relief space. The first sub-pressure relief space is located between the first battery cluster and the protection board, and the second sub-pressure relief space is located between the second battery cluster and the protection board. A cavity is arranged in the protection board, and the explosion-proof valve of the single cell faces the protection board.

[0009] The battery pack provided by the embodiments of the present disclosure includes a first battery cluster, a second battery cluster, and a protection board. The protection board is disposed between the first battery cluster and the second battery cluster. The explosion-proof valves of the single cells in the first battery cluster and the second battery cluster face the protection board. When a single cell on one side of the protection board undergoes thermal runaway, the protection board blocks the liquid and gas ejected by the single cell, preventing the liquid and gas ejected by the thermally runaway single cell from directly spraying onto the opposite single cell, thereby suppressing the spread of thermal runaway. Further, the protection board has a cavity. By means of the cavity provided in the protection board, heat insulation between the first battery cluster and the second battery cluster is achieved, and this cavity can also serve as a pressure relief space when the explosion-proof valve of the single cell bursts and breaks through the protection board, further preventing the spread of thermal runaway.

[0010] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and cannot limit the present disclosure. Brief Description of the Drawings

[0011] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure and 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, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0012] Figure 1 Schematic structural diagram of a battery pack provided by an exemplary embodiment of the present disclosure;

[0013] Figure 2 Schematic structural diagram of a single cell provided by an exemplary embodiment of the present disclosure;

[0014] Figure 3 Schematic structural diagram of another battery pack provided by an exemplary embodiment of the present disclosure.

[0015] Description of the reference numerals:

[0016] 10, single cell; 11, battery housing; 12, battery core; 13, terminal post; 14, explosion-proof valve; 110, first battery cluster; 120, second battery cluster; 20, protection board; 21, cavity; 30, box body; 31, bottom plate; 40, support assembly; 41, first support plate; 42, second support plate; 43, first support post; 44, second support post. Detailed Description of the Embodiments

[0017] Next, the technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described in conjunction with 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.

[0018] 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 / or" includes any combination and all combinations of one or more of the associated listed items. In particular, referring to "the / this" object or "one" object also intends to represent one of the possible multiple such objects.

[0019] Unless otherwise specified or stated, terms such as "connection" and "fixation" 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.

[0020] Furthermore, in the description of the present disclosure, it should be understood that the orientation terms such as "upper", "lower", "inner", and "outer" described in the exemplary embodiments of the present disclosure are described from the angles shown in the accompanying drawings and should not be understood as limiting the exemplary embodiments of the present disclosure. It should also be understood that in the context, when referring to an element or feature being connected "on", "under", or "inside", "outside" of another element (one or more), it can not only be directly connected "on", "under", or "inside", "outside" of another (one or more) element, but also be indirectly connected "on", "under", or "inside", "outside" of another (one or more) element through an intermediate element.

[0021] The exemplary embodiments of the present disclosure provide a battery pack, such as Figure 1 and Figure 2As shown, the battery pack includes a first battery cluster 110, a second battery cluster 120 and a protection plate 20. The first battery cluster 110 includes at least one single battery cell 10; the second battery cluster 120 includes at least one single battery cell 10. The second battery cluster 120 and the first battery cluster 110 are stacked along a first direction (Z direction), and a pressure relief space is provided between the first battery cluster 110 and the second battery cluster 120; the protection plate 20 is provided in the pressure relief space, dividing the pressure relief space into a first sub-pressure relief space and a second sub-pressure relief space. The first sub-pressure relief space is located between the first battery cluster 110 and the protection plate 20, and the second sub-pressure relief space is located between the second battery cluster 120 and the protection plate 20. A cavity 21 is provided in the protection plate 20, and the explosion-proof valve 14 of the single battery cell 10 faces the protection plate 20.

[0022] The battery pack provided by the embodiments of the present disclosure includes a first battery cluster 110, a second battery cluster 120, and a protective plate 20. The protective plate 20 is disposed between the first battery cluster 110 and the second battery cluster 120. The explosion-proof valves 14 of the individual cells 10 in the first and second battery clusters 110, 120 face the protective plate 20. When a cell 10 on one side of the protective plate 20 experiences thermal runaway, the protective plate 20 blocks the liquid and gas ejected from the cell 10, preventing the liquid and gas ejected from the thermally runaway cell 10 from directly spraying onto the opposite cell 10, thereby suppressing the spread of thermal runaway. Furthermore, the protective plate 20 has a cavity within it. This cavity within the protective plate 20 provides thermal insulation for the first and second battery clusters 110, 120. Furthermore, the cavity 21 also serves as a pressure relief space when the explosion-proof valve 14 of the cell 10 explodes and breaks through the protective plate 20, further preventing the spread of thermal runaway.

[0023] Further, such as Figure 3 As shown, the battery pack provided in the embodiment of the present disclosure may further include a support assembly 40, which includes a first support plate 41 and / or a second support plate 42. The first support plate 41 is disposed between the first battery cluster 110 and the protective plate 20 and is used to support the first battery cluster 110, thereby forming a first sub-pressure relief space between the first battery cluster 110 and the protective plate 20. The second support plate 42 is disposed between the second battery cluster 120 and the protective plate 20 and is used to support the second battery cluster 120, thereby forming a second sub-pressure relief space between the second battery cluster 120 and the protective plate 20. By supporting and limiting the first and second battery clusters 110, 120 by the support assembly 40, the structural stability of the battery pack can be improved.

[0024] Furthermore, the battery pack further includes a box 30 having a bottom plate 31 . The first battery cluster 110 and the second battery cluster 120 are disposed in the box 30 , and the first battery cluster 110 is located on a side of the second battery cluster 120 away from the bottom plate 31 .

[0025] The following will provide a detailed description of each part of the battery pack provided by the embodiments of the present disclosure:

[0026] The first battery cluster 110 includes at least one single battery 10. When the first battery cluster 110 includes multiple single batteries 10, the multiple single batteries 10 are distributed according to a preset rule. For example, the multiple single batteries 10 are arranged in an array. The multiple single batteries 10 in the first battery cluster 110 form a battery flat layer, that is, the end faces of the multiple single batteries 10 are aligned along the first direction.

[0027] The second battery cluster 120 includes at least one single battery 10. When the second battery cluster 120 includes multiple single batteries 10, the multiple single batteries 10 are distributed according to a preset rule. For example, the multiple single batteries 10 are arranged in an array. The multiple single batteries 10 in the second battery cluster 120 form a battery flat layer, that is, the end faces of the multiple single batteries 10 are aligned along the first direction.

[0028] The second battery cluster 120 and the first battery cluster 110 are stacked along the first direction, and there is a pressure relief space between the first battery cluster 110 and the second battery cluster 120. In the embodiments of the present disclosure, the single batteries 10 in the first battery cluster 110 and the second battery cluster 120 are the same. Of course, in actual applications, the single batteries 10 in the first battery cluster 110 and the second battery cluster 120 may also be different, and the embodiments of the present disclosure are not limited thereto.

[0029] The single battery 10 may include a battery case 11, a battery cell 12, and a terminal 13. The battery case 11 is used to form the outer contour of the single battery 10 and protect the components inside the battery case 11. A receiving space is provided inside the battery case 11, the battery cell 12 is disposed in the receiving space, the terminal 13 is provided on the battery case 11, and the terminal 13 is connected to the battery cell 12.

[0030] An explosion-proof valve 14 is provided on the battery case 11. The explosion-proof valve 14 is used to burst after the battery thermal runaway, thereby relieving the pressure of the single battery 10. The explosion-proof valve 14 may be a thinning portion provided on the surface of the battery case 11, and the strength of the thinning portion is less than the strength of the remaining portions of the battery case 11. Thus, when the internal pressure of the single battery 10 is too high, the explosion-proof valve 14 is torn, realizing the directional pressure relief of the single battery 10. For example, the explosion-proof valve 14 may be obtained by forming a circular scratch on the surface of the battery case 11.

[0031] The battery case 11 may include a case body and a cover plate. One end of the case body has an opening, and the cover plate is connected to the opening of the case body. The case body may include a bottom plate and a side frame. The bottom plate and the cover plate are oppositely arranged. The side frame is in a cylindrical structure with two open ends, and the bottom plate and the cover plate are respectively connected to the two ends of the cylindrical structure.

[0032] 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 connection. The bottom plate and the side frame can be of an integral molding structure or a split molding structure. When the bottom plate and the side frame are of an integral molding structure, the housing body can be formed by means such as stamping or casting. When the bottom plate and the side frame are of a split molding structure, the housing body can be formed by means such as welding, riveting or adhesive connection.

[0033] The battery cell 12 is disposed within the battery housing 11. The battery cell 12 is connected to the pole post 13, and the battery cell 12 is immersed in the electrolyte. The battery cell 12 includes a battery cell body and tabs. The tabs extend from the battery cell body; there are two tabs on the battery cell 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 adapter parts.

[0034] It should be noted that the battery cell body can 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 tabs.

[0035] In one embodiment, the battery is a stacked battery, which is not only convenient for grouping, but also a battery with a longer length can be obtained by processing. The battery cell 12 is a stacked battery cell, and the battery cell 12 has a first electrode plate, a second electrode plate with 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 on each other, so that multiple pairs of the first electrode plate and the second electrode plate are stacked to form the stacked battery cell.

[0036] Optionally, the battery cell 12 can be a wound battery cell, that is, the first electrode plate, the second electrode plate with 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.

[0037] The pole post 13 is disposed on the battery housing 11, and an installation hole is provided on the battery housing 11, and the pole post 13 passes through the installation hole. A part of the pole post 13 is located within the battery housing 11, and a part of the pole post 13 is located outside the battery housing 11. The part located within the battery housing 11 is connected to the battery cell 12, and the part located outside the battery housing 11 is used to connect conductive parts such as a bus bar.

[0038] In a feasible implementation manner of the present disclosure, the pole post 13 is disposed on the first surface of the battery housing 11, and the explosion-proof valve 14 is disposed on the first surface of the battery housing 11 and is disposed around the pole post 13. For example, the explosion-proof valve 14 is a notch provided on the first surface of the battery housing 11, and the notch surrounds the pole post 13.

[0039] Optionally, both the explosion-proof valve 14 and the terminal 13 are disposed on the bottom panel of the battery housing 11, and both the explosion-proof valve 14 and the terminal 13 face the protection board 20. Of course, in practical applications, the explosion-proof valve 14 and the terminal 13 can also be disposed on the cover plate of the battery housing 11, and the embodiments of the present disclosure are not limited thereto.

[0040] In another feasible embodiment of the present disclosure, the terminal 13 is disposed at one end of the battery housing 11, and the explosion-proof valve 14 is disposed at the other end of the battery housing 11. For example, the terminal 13 is disposed at one end of the battery housing 11 away from the protection board 20, and the explosion-proof valve 14 is disposed at one end of the battery housing 11 facing the protection board 20.

[0041] By disposing the terminal 13 and the explosion-proof valve 14 at both ends of the battery housing 11, the separation of the explosion-proof valve 14 and the terminal 13 is achieved. On the one hand, it avoids the terminal 13 impacting the explosion-proof valve 14 of the opposite single battery 10 after thermal runaway. On the other hand, it also avoids the problem that high-temperature and high-pressure gas is directly sprayed onto devices such as the bus bar connected to the terminal 13, thereby causing the problem of electrical connection failure.

[0042] In the embodiment of the present disclosure, the single battery 10 is a cylindrical battery. The axis of the first single battery 10 is arranged along the first direction, and the axis of the second single battery 10 is arranged along the first direction. That is, multiple single batteries 10 are arranged in two layers vertically. The vertical arrangement of the single batteries 10 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.

[0043] On this basis, the cover plate and the bottom panel are of a disc structure, and the side frame is of a hollow cylindrical structure. When the battery is a cylindrical battery, there is one terminal 13 disposed on the battery housing 11, and the terminal 13 serves as one electrode end of the battery, and the other electrode end of the battery is the battery housing 11. For example, the terminal 13 is the positive electrode end of the battery, the terminal 13 is connected to the positive electrode tab of the battery cell 12, the battery housing 11 is the negative electrode end of the battery, and the battery housing 11 is connected to the negative electrode tab of the battery cell 12.

[0044] It can be understood that in some other embodiments, the single battery 10 can also be a quadrangular prism battery. The quadrangular prism battery can include a first terminal 13 and a second terminal 13, the first terminal 13 and the second terminal 13 are respectively disposed on the surface of the battery housing 11, and the first terminal 13 and the second terminal 13 are respectively connected to the battery cell 12.

[0045] The first battery cluster 110 and the second battery cluster 120 are stacked, and there is a gap between the first battery cluster 110 and the second battery cluster 120. The gap between the first battery cluster 110 and the second battery cluster 120 forms a pressure relief space. When the single battery 10 undergoes thermal runaway, the liquid and gas discharged from the single battery 10 enter the pressure relief space to achieve pressure relief of the single battery 10.

[0046] The protection board 20 is disposed in the pressure relief space, dividing the pressure relief space into a first sub-pressure relief space and a second sub-pressure relief space. The first sub-pressure relief space is located between the first battery cluster 110 and the protection board 20, and the second sub-pressure relief space is located between the second battery cluster 120 and the protection board 20. A cavity 21 is provided inside the protection board 20, and the explosion-proof valve 14 of the single battery 10 faces the protection board 20.

[0047] After the single battery 10 in the first battery cluster 110 undergoes thermal runaway and explodes, the gas and liquid discharged from the explosion-proof valve 14 enter the first sub-pressure relief space to achieve pressure relief. After the single battery 10 in the second battery cluster 120 undergoes thermal runaway and explodes, the gas and liquid discharged from the explosion-proof valve 14 enter the second sub-pressure relief space to achieve pressure relief. By separating the pressure relief space with the protection board 20, the first battery cluster 110 and the second battery cluster 120 are respectively pressure-relieved, reducing the risk of thermal runaway spread.

[0048] The dimension of the protection board 20 in the first direction is D1, and the dimension of the pressure relief space in the first direction is D2. The ratio range of D1 to D2 is 0.2 - 1. For example, the ratio of D1 to D2 can be 0.2, 0.3, 0.5, 0.8, 0.9, or 1, etc.

[0049] By setting the ratio of D1 to D2 to 0.2 - 1, the strength of the separator and the space in the height direction of the pressure relief space are taken into account. On the one hand, the ratio of D1 to D2 is greater than or equal to 0.2, ensuring the strength of the separator. On the other hand, the ratio of D1 to D2 is less than or equal to 1, effectively controlling the thickness of the separator and saving the space in the height direction of the pressure relief space.

[0050] The protection board 20 has a cavity 21 inside. For example, the protection board 20 may include a first panel, a second panel, and a side enclosure. The first panel and the second panel are oppositely arranged 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 the cavity 21 inside the protection board 20.

[0051] To enhance the strength and stability of the protection board 20, reinforcing ribs can be provided in the cavity 21 of the protection board 20. The reinforcing ribs can extend along the length direction of the protection board 20, or the reinforcing ribs can extend along the width direction of the protection board 20. Or the reinforcing ribs inside the protection board 20 can be arranged in a staggered manner. For example, the protection board 20 has a first reinforcing rib and a second reinforcing rib, and the extending directions of the first reinforcing rib and the second reinforcing rib intersect. The reinforcing ribs can be continuous or intermittent. When the reinforcing ribs are intermittent, they can buffer the gas and liquid discharged from the battery when the cavity 21 inside the protection board 20 is used as a pressure relief channel, reducing the flow velocity.

[0052] The cavity 21 of the protection plate 20 is filled with a heat absorption layer, which is used to absorb the heat of the high-temperature gas and liquid discharged by the battery after thermal runaway of the battery, thereby reducing the temperature inside the battery pack, avoiding the further spread of thermal runaway, and improving the safety of the battery pack.

[0053] The support assembly 40 is used to support the first battery cluster 110 and the second battery cluster 120 to ensure the stability of the pressure relief space. In a feasible implementation manner, the support assembly 40 includes a first support plate 41 and a first support column 43. The first support plate 41 is disposed between the first battery cluster 110 and the protection plate 20, and the first support plate 41 is used to support the first battery cluster 110 to form a first sub-pressure relief space between the first battery cluster 110 and the protection plate 20. The first support column 43 is disposed between the first support plate 41 and the protection plate 20, and both ends of the first support column 43 are in contact with the first support plate 41 and the protection plate 20 respectively.

[0054] In another feasible implementation manner of the present disclosure, the support assembly 40 may include a first support plate 41, a second support plate 42, a first support column 43, and a second support column 44. The first support plate 41 is disposed between the first battery cluster 110 and the protection plate 20, and the first support plate 41 is used to support the first battery cluster 110 to form a first sub-pressure relief space between the first battery cluster 110 and the protection plate 20. The second support plate 42 is disposed between the second battery cluster 120 and the protection plate 20, and the second support plate 42 is used to support the second battery cluster 120 to form a second sub-pressure relief space between the second battery cluster 120 and the protection plate 20. The first support column 43 is disposed between the first support plate 41 and the protection plate 20, and both ends of the first support column 43 are in contact with the first support plate 41 and the protection plate 20 respectively. The second support column 44 is disposed between the second support plate 42 and the protection plate 20, and both ends of the second support column 44 are in contact with the second support plate 42 and the protection plate 20 respectively.

[0055] A weak part is provided on the first support plate 41, and at least part of the weak part coincides with the first projection area, and the first projection area is the orthographic projection of the explosion-proof valve 14 of the single battery 10 in the first battery cluster 110 on the first support plate 41. The weak part may be a thinning structure, a scoring structure or other structures that weaken the local strength, or the weak part may also be a through hole. By providing the weak part on the first support plate 41, the liquid and gas discharged after the thermal runaway of the single battery 10 in the first battery cluster 110 can enter the pressure relief space through the first support plate 41.

[0056] The second support plate 42 is provided with a weakened portion, which at least partially overlaps with a second projected area. The second projected area is the orthographic projection of the explosion-proof valves 14 of the single cells 10 in the second battery cluster onto the second support plate 42. This weakened portion can be a thinning structure, a notched structure, or other structure that reduces local strength, or it can be a through-hole. By providing the weakened portion on the second support plate 42, liquid and gas released from the single cells 10 in the second battery cluster 120 after thermal runaway can enter the pressure relief space through the second support plate 42.

[0057] A first fireproof layer may be provided on the first support plate 41 to prevent fire within the battery pack after thermal runaway of the single battery cells 10. For example, the first fireproof layer may be a mica sheet. The first fireproof layer on the first support plate 41 may be provided on the side of the first support plate 41 facing the first battery cluster 110. Alternatively, the first fireproof layer on the first support plate 41 may cover the first support plate 41.

[0058] The second support plate 42 may be provided with a second fireproof layer to prevent fire within the battery pack after thermal runaway of the single battery cells 10. For example, the second fireproof layer may be a mica sheet. The second fireproof layer on the second support plate 42 may be provided on the side of the second support plate 42 facing the second battery cluster 120. Alternatively, the second fireproof layer on the second support plate 42 may cover the second support plate 42.

[0059] In one embodiment, the first support plate 41 is an integral structure, or the first support plate 41 is formed by a plurality of first sub-support plates;

[0060] The second support plate 42 is an integral structure, or the second support plate 42 is formed by a plurality of second sub-support plates.

[0061] The battery pack provided by the embodiments of the present disclosure includes a first battery cluster 110, a second battery cluster 120, and a protective plate 20. The protective plate 20 is disposed between the first battery cluster 110 and the second battery cluster 120. The explosion-proof valves 14 of the individual cells 10 in the first and second battery clusters 110, 120 face the protective plate 20. When a cell 10 on one side of the protective plate 20 experiences thermal runaway, the protective plate 20 blocks the liquid and gas ejected from the cell 10, preventing the liquid and gas ejected from the thermally runaway cell 10 from directly spraying onto the opposite cell 10, thereby suppressing the spread of thermal runaway. Furthermore, the protective plate 20 has a cavity within it. This cavity within the protective plate 20 provides thermal insulation for the first and second battery clusters 110, 120. Furthermore, the cavity 21 also serves as a pressure relief space when the explosion-proof valve 14 of the cell 10 explodes and breaks through the protective plate 20, further preventing the spread of thermal runaway.

[0062] The battery pack provided by the embodiments of the present disclosure can be applied to an electric vehicle. The battery pack is installed on the electric vehicle to provide energy for the electric vehicle. In practical 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.

[0063] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. 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 known common 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 includes: a first battery cluster, the first battery cluster comprising at least one single battery; a second battery cluster, the second battery cluster including at least one single battery cell, the second battery cluster and the first battery cluster being stacked along a first direction, with a pressure relief space being defined between the first battery cluster and the second battery cluster; A protective plate is provided in the pressure relief space to separate the pressure relief space into a first sub-pressure relief space and a second sub-pressure relief space, wherein the first sub-pressure relief space is located between the first battery cluster and the protective plate, and the second sub-pressure relief space is located between the second battery cluster and the protective plate. A cavity is provided in the protective plate, and the explosion-proof valve of the single battery faces the protective plate.

2. The battery pack according to claim 1, characterized in that, The size of the protection plate in the first direction is D1, the size of the pressure relief space in the first direction is D2, and the ratio of D1 to D2 is in the range of 0.2-1.

3. The battery pack according to claim 1, characterized in that, The battery pack further includes a support assembly, which includes: a first support plate, the first support plate being disposed between the first battery cluster and the protection plate, the first support plate being used to support the first battery cluster to form the first sub-pressure relief space between the first battery cluster and the protection plate; and / or A second support plate is provided between the second battery cluster and the protection plate, and is used to support the second battery cluster to form the second sub-pressure relief space between the second battery cluster and the protection plate.

4. The battery pack according to claim 3, characterized in that, A weak portion is provided on the first support plate, wherein the weak portion at least partially overlaps with a first projection area, the first projection area being an orthographic projection of the explosion-proof valve of the single battery in the first battery cluster on the first support plate; A weak portion is provided on the second support plate, and the weak portion at least partially overlaps with a second projection area, which is the orthographic projection of the explosion-proof valve of the single battery in the second battery cluster on the second support plate.

5. The battery pack according to claim 3, characterized in that, The support assembly further comprises: a first supporting column, the first supporting column being provided between the first supporting plate and the protective plate; A second supporting column is provided between the second supporting plate and the protection plate.

6. The battery pack according to claim 3, characterized in that A first fireproof layer is provided on the first supporting plate; A second fireproof layer is provided on the second supporting plate.

7. The battery pack according to claim 3, wherein The first support plate is an integral structure, or the first support plate is formed by a plurality of first sub-support plates; The second support plate is an integral structure, or the second support plate is formed by a plurality of second sub-support plates.

8. The battery pack according to any one of claims 1-7, characterized in that, The battery pack further includes: The box has a bottom plate, the first battery cluster and the second battery cluster are arranged in the box, and the first battery cluster is located on a side of the second battery cluster away from the bottom plate.

9. The battery pack according to any one of claims 1-7, characterized in that, The cavity of the protection plate is filled with a heat absorption layer.

10. The battery pack according to any one of claims 1-7, characterized in that, The single battery is a cylindrical battery, and the axis of the single battery is arranged along the first direction.

Images