Battery pack

Abstract

The invention discloses a battery pack, and belongs to the technical field of batteries, the battery pack comprises a battery box body and an explosion-proof valve, the battery box body comprises box body side plates and a box body bottom plate, the box body side plates and the box body bottom plate enclose an accommodating cavity for placing battery cells, an exhaust channel is arranged in at least part of the box body side plates, and the explosion-proof valve is arranged in the accommodating cavity. A plurality of exhaust holes communicated with the exhaust channel are formed in the sides, facing the containing cavity, of the set of oppositely-arranged box body side plates. The explosion-proof valve is arranged on one of the other group of oppositely arranged box body side plates, and the exhaust channel in the box body side plate provided with the explosion-proof valve is communicated with the exhaust channel in the box body side plate provided with the exhaust hole, so that the containing cavity is communicated with the outside through the exhaust cavity of the explosion-proof valve. The plurality of exhaust holes can exhaust high-temperature airflow in the accommodating cavity in time, and the exhaust channel prolongs the exhaust path, so that the anti-explosion valve can be far away from the battery cell in thermal runaway, open fire is prevented from being generated at the anti-explosion valve, and the safety is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery pack. Background Technology

[0002] When a power battery pack experiences thermal runaway, it generates a large amount of heat. When this heat accumulates to a certain critical value, it triggers the explosion-proof valve to open, simultaneously ejecting a series of high-temperature explosive materials. If the heat cannot be dissipated in time when one battery cell experiences thermal runaway, it can easily adversely affect nearby cells. Because the battery pack contains multiple cells but has a limited number of explosion-proof valves, some cells are located far from these valves. Consequently, the heat generated during thermal runaway cannot be dissipated through the explosion-proof valves in time and accumulates within the battery pack, posing a safety hazard. Summary of the Invention

[0003] This invention provides a battery pack to solve the technical problem in the prior art that heat cannot be dissipated in a timely manner during thermal runaway.

[0004] Based on the above concept, the technical solution adopted by this invention is as follows:

[0005] A battery pack, comprising:

[0006] A battery housing includes a side panel and a bottom panel, wherein the side panel and the bottom panel form a cavity for placing battery cells. At least a portion of the side panel has an exhaust channel inside, and a group of oppositely arranged side panels have multiple exhaust holes communicating with the exhaust channel on the side facing the cavity.

[0007] An explosion-proof valve is installed on one of the oppositely arranged side panels of the enclosure. The exhaust channel inside the side panel with the explosion-proof valve is connected to the exhaust channel inside the side panel with the exhaust hole, so as to connect the accommodating cavity with the outside through the exhaust chamber of the explosion-proof valve.

[0008] Preferably, the plurality of exhaust holes are spaced apart along a first direction, and the exhaust channel located between adjacent exhaust holes is provided with a raised reinforcing structure on the inner wall near the receiving cavity, the first direction being parallel to the extending direction of the exhaust channel inside the side plate of the housing where the exhaust holes are located.

[0009] Preferably, the width D1 of the exhaust channel corresponding to the exhaust hole is greater than the width D2 of the exhaust channel corresponding to the reinforcing structure, so that the width of the exhaust channel changes periodically in the first direction.

[0010] Preferably, the reinforcing structure is provided with a protruding boss, which is located at one end of the reinforcing structure along a third direction and protrudes from the surface of the box side plate away from the receiving cavity. The boss is used to provide a lifting point structure.

[0011] Preferably, the top wall of the boss serves as the bottom wall of the exhaust channel, and the height H1 of the exhaust channel corresponding to the exhaust hole is greater than the height H2 of the exhaust channel corresponding to the reinforcing structure.

[0012] Preferably, the side panel of the housing includes an outer protective panel, and the side wall portion of the side panel facing away from the accommodating cavity forms a window communicating with the exhaust channel, and the outer protective panel is closedly connected to the window;

[0013] The window avoids the protrusion, and the edge of the outer protective plate is provided with a notch, which exposes the protrusion.

[0014] Preferably, two explosion-proof valves are provided, spaced apart along the second direction on the side plate of the enclosure. A partition is provided in the exhaust channel inside the side plate of the enclosure where the explosion-proof valves are provided, the partition dividing the exhaust channel into two sub-cavities arranged along the second direction, each sub-cavity corresponding to one explosion-proof valve, and a connecting hole is provided on the partition, the connecting hole connecting the two sub-cavities.

[0015] Preferably, a crossbeam is provided inside the accommodating cavity, the crossbeam extends along a second direction to divide the accommodating cavity into an electrical cavity and a battery cell cavity, the exhaust channel is arranged around the periphery of the battery cell cavity away from the electrical cavity, and the explosion-proof valve is arranged at the end of the battery cell cavity away from the electrical cavity.

[0016] Preferably, the crossbeam has a through hole along a third direction, and the battery pack also includes an upper cooling plate and a lower cooling plate. The upper cooling plate is connected to one end of the through hole through an upper connector, and the lower cooling plate is connected to the other end of the through hole through a lower connector.

[0017] Preferably, a groove is provided around the through hole, the groove is used to install the first sealing element, and at least two fixing holes are provided on the outside of the groove, the fasteners cooperate with the fixing holes to securely seal the upper and lower connectors.

[0018] The beneficial effects of this invention are:

[0019] The battery pack proposed in this invention allows high-temperature airflow within the containment cavity to enter the exhaust channel through the vent, and then flow along the exhaust channel to the explosion-proof valve, breaking through the valve and exiting the battery pack to the outside. By providing multiple vents, the high-temperature airflow within the containment cavity can be discharged promptly, ensuring safety. By placing the exhaust channel on the side panel of the pack, space is fully utilized, improving the integration of the battery pack. By placing vents on one set of opposite side panels and an explosion-proof valve on one of the opposite side panels, the coverage area of ​​the exhaust channel is increased and the exhaust path is extended, allowing the explosion-proof valve to be kept away from the thermally runaway cell, preventing open flames at the explosion-proof valve and increasing safety. Attached Figure Description

[0020] Figure 1 This is a first structural schematic diagram of the battery pack provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the second structure of the battery pack provided in an embodiment of the present invention;

[0022] Figure 3 This is a first cross-sectional view of the battery pack provided in an embodiment of the present invention;

[0023] Figure 4 This is a first schematic diagram of a portion of the structure of the battery pack provided in an embodiment of the present invention;

[0024] Figure 5 This is a second schematic diagram of a portion of the battery pack structure provided in an embodiment of the present invention;

[0025] Figure 6 This is a partial structural cross-sectional view of the battery pack provided in an embodiment of the present invention;

[0026] Figure 7 yes Figure 6 Enlarged view of point A;

[0027] Figure 8 yes Figure 6 Enlarged view of point B;

[0028] Figure 9 This is a top view of the battery pack provided in an embodiment of the present invention;

[0029] Figure 10 yes Figure 9 CC-direction sectional view;

[0030] Figure 11 yes Figure 9 DD section view;

[0031] Figure 12 This is a partial exploded view of the battery pack structure provided in an embodiment of the present invention;

[0032] Figure 13 This is a third schematic diagram of a portion of the battery pack structure provided in an embodiment of the present invention;

[0033] Figure 14 yes Figure 13 Enlarged view of point E;

[0034] Figure 15 yes Figure 13 Enlarged view at point F;

[0035] Figure 16 This is a partial structural schematic diagram of the crossbeam provided in an embodiment of the present invention;

[0036] Figure 17 This is a second cross-sectional view of the battery pack provided in an embodiment of the present invention;

[0037] Figure 18 yes Figure 17 Enlarged view of point H.

[0038] In the picture:

[0039] X, first direction; Y, second direction; Z, third direction;

[0040] 10. Battery housing; 101. Receiving cavity; 1011. Electrical cavity; 1012. Cell cavity; 11. Side panel of housing; 111. Exhaust channel; 112. Exhaust hole; 113. Outer protective plate; 1131. Notch; 1132. Receiving hole; 114. Sub-cavity; 115. Window; 12. Bottom plate of housing; 13. Reinforcing structure; 14. Boss; 15. Lifting point structure; 16. Inner protective plate; 17. Partition; 171. Connecting hole; 18. Maintenance plate;

[0041] 20. Explosion-proof valve;

[0042] 30. Battery cells;

[0043] 40. Crossbeam; 41. Through hole; 42. Groove; 421. Positioning groove; 422. Limiting groove; 43. Fixing hole; 44. Thickened part;

[0044] 51. Upper cold plate; 52. Lower cold plate; 53. Upper connector; 54. Lower connector; 55. First seal; 56. Second seal; 57. Liquid inlet pipe; 58. Liquid outlet pipe;

[0045] 60. Fasteners. Detailed Implementation

[0046] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] See Figures 1 to 18 This application provides a battery pack, including a battery housing 10 and an explosion-proof valve 20. The battery housing 10 includes a housing side plate 11 and a housing bottom plate 12. The housing side plate 11 and the housing bottom plate 12 form a receiving cavity 101 for placing battery cells 30. At least a portion of the housing side plate 11 is provided with an exhaust channel 111. A group of oppositely arranged housing side plates 11 are provided with a plurality of exhaust holes 112 communicating with the exhaust channel 111 on the side facing the receiving cavity 101. The explosion-proof valve 20 is disposed on one of the other group of oppositely arranged housing side plates 11. The exhaust channel 111 inside the housing side plate 11 with the explosion-proof valve 20 is connected to the exhaust channel 111 inside the housing side plate 11 with the exhaust holes 112, so as to connect the receiving cavity 101 with the outside through the exhaust chamber of the explosion-proof valve 20.

[0051] When the battery cell 30 experiences thermal runaway, the high-temperature airflow in the accommodating cavity 101 enters the exhaust channel 111 through the exhaust port 112 and flows along the exhaust channel 111 to the position of the explosion-proof valve 20, breaking through the explosion-proof valve 20 and being discharged from the battery box 10 to the outside. Figure 6 The middle arrow indicates the airflow direction. By setting multiple exhaust holes 112, multi-point distributed exhaust can be formed, shortening the average distance of the high-temperature airflow to the exhaust path. This allows the high-temperature airflow in the accommodating cavity 101 to be discharged in a timely manner, ensuring safety, especially suitable for large-capacity batteries. By setting the exhaust channel 111 on the side plate 11 of the housing, space is fully utilized, and the integration of the battery housing 10 is improved. By setting exhaust holes 112 on a set of oppositely arranged side plates 11 and setting an explosion-proof valve 20 on one of the oppositely arranged side plates 11, the coverage of the exhaust channel 111 is increased and the exhaust path is extended, so that the explosion-proof valve 20 can be kept away from the thermally runaway battery cell 30, avoiding open flames at the explosion-proof valve 20 and increasing safety.

[0052] The first direction, the second direction, and the third direction are defined with reference to the length, width, and height of the battery housing 10. The first direction corresponds to the length direction of the battery housing 10 and is represented by X in the attached drawing. The second direction corresponds to the width direction of the battery housing 10 and is represented by Y in the attached drawing. The third direction corresponds to the height direction of the battery housing 10 and is represented by Z in the attached drawing.

[0053] One set of opposing side panels 11 are arranged along the Y direction on both sides of the bottom plate 12 of the box and have vent holes 112. Another set of opposing side panels 11 are arranged along the X direction on the other two sides of the bottom plate 12 of the box and have an explosion-proof valve 20 installed on one of the side panels 11. In this embodiment, both the set of opposing side panels 11 along the Y direction and the side panel 11 with the explosion-proof valve 20 are provided with vent channels 111 to form a U-shaped extended vent channel 111. The accommodating cavity 101, the vent holes 112 and the vent channel 111 are connected. The vent chamber of the explosion-proof valve 20 is connected to the vent channel 111 and the outside, thus realizing the connection between the accommodating cavity 101 and the outside. The outside is the outside of the battery box 10.

[0054] See Figures 5 to 11 Multiple exhaust holes 112 are spaced apart along a first direction. A raised reinforcing structure 13 is provided on the inner wall of the exhaust channel 111 located between adjacent exhaust holes 112, near the accommodating cavity 101. The first direction is parallel to the extending direction of the exhaust channel 111 inside the side panel 11 of the housing where the exhaust holes 112 are located. By providing the raised reinforcing structure 13, the wall thickness of the side panel 11 is increased, thereby increasing the structural strength to prevent high-temperature airflow from damaging the side panel 11 and ensuring that the high-temperature airflow can flow along the direction of the accommodating cavity 101, the exhaust holes 112, the exhaust channel 111, and the explosion-proof valve 20.

[0055] The width D1 of the exhaust channel 111 corresponding to the exhaust port 112 is greater than the width D2 of the exhaust channel 111 corresponding to the reinforcing structure 13, so that the width of the exhaust channel 111 changes periodically in the first direction. Since multiple exhaust ports 112 are spaced apart along the first direction, and a reinforcing structure 13 is provided between adjacent exhaust ports 112, the exhaust channel 111 at the reinforcing structure 13 is smaller, so that the width of the exhaust channel 111 changes periodically from large to small to large to small... The smaller width can accelerate the high-temperature airflow in thermal runaway, theoretically increasing the flow velocity by 1.5-2 times. Therefore, it can increase the exhaust efficiency, allowing the high-temperature airflow to be discharged rapidly in a short time, preventing heat from accumulating locally and causing chain thermal runaway, thus increasing safety.

[0056] The shape of the exhaust port 112 can be set according to actual needs. For example, the exhaust port 112 may be rectangular, circular, hexagonal, or other shapes. The cross-sectional shape of the exhaust channel 111 can be set according to actual needs. For example, the cross-sectional shape of the exhaust channel 111 is rectangular, and the width direction of the exhaust channel 111 extends along the second direction. The shape of the reinforcing structure 13 can be set according to actual needs. For example, the reinforcing structure 13 is cuboid in shape.

[0057] See Figure 6 , Figure 7 and Figure 13 The reinforcing structure 13 has a raised boss 14, which is located at one end of the reinforcing structure 13 along a third direction and protrudes from the surface of the side plate 11 away from the receiving cavity 101. The boss 14 is used to set up the lifting point structure 15. By setting up the boss 14, the structural strength is further increased, and it can support the lifting point structure 15, making the thickness at the location of the lifting point structure 15 the thickest, thus ensuring the stability of the lifting point structure 15. The lifting point structure 15 is a load-bearing component during the transportation, installation, and maintenance of the battery pack. Therefore, ensuring the strength requirements of the lifting point structure 15 and avoiding stress concentration can improve the reliability of the battery pack.

[0058] The top wall of the boss 14 serves as the bottom wall of the exhaust passage 111, and the height H1 of the exhaust passage 111 corresponding to the exhaust hole 112 is greater than the height H2 of the exhaust passage 111 corresponding to the reinforcing structure 13. By setting the boss 14, the height of the exhaust passage 111 corresponding to the position of the boss 14 is reduced, so that the height of the exhaust passage 111 changes periodically in the first direction.

[0059] For the exhaust channel 111 at the reinforced structure 13, compared to the exhaust channel 111 at the exhaust port 112, both the width and height of the exhaust channel 111 are reduced, meaning the cross-sectional area of ​​the exhaust channel 111 is reduced. This reduced cross-sectional area accelerates the high-temperature airflow during thermal runaway, thus increasing exhaust efficiency and allowing the high-temperature airflow to be rapidly discharged, enhancing safety. Through periodic alternations in height and width, not only can the velocity of the high-temperature airflow be increased and the structural strength strengthened, but the periodic contraction and expansion also create vortices, increasing the heat transfer coefficient between the high-temperature airflow and the wall surface and enhancing heat transfer capacity.

[0060] The side panel 11 of the enclosure includes an outer protective panel 113. The side wall portion of the side panel 11 facing away from the accommodating cavity 101 forms a window 115 that communicates with the exhaust channel 111. The outer protective panel 113 is closedly connected to the window 115. By providing the window 115, it is convenient to process and manufacture the exhaust channel 111. The window 115 is sealed by the outer protective panel 113 to prevent air leakage from the window 115.

[0061] Specifically, the side panel 11 of the enclosure forms a frame structure by providing an exhaust channel 111 and an exhaust hole 112, and the outer protective panel 113 is connected to the frame structure. For example, the frame structure is provided with a relief groove, and the edge of the outer protective panel 113 abuts against the relief groove, which facilitates the fixing of the outer protective panel 113 and improves the sealing of the exhaust channel 111.

[0062] For example, the outer protective plate 113 is made of titanium alloy. Because titanium alloy has a high melting point (≥1600℃) and good mechanical properties, it can effectively provide heat insulation and impact protection, improve structural strength, and prevent high-temperature airflow from breaking through the outer protective plate 113 and causing the battery casing 10 to fail. By using a titanium alloy plate for the outer protective plate 113, instead of making the entire side panel 11 of the casing a titanium alloy plate, costs can be reduced while ensuring protective effectiveness.

[0063] Window 115 avoids protrusion 14, and a notch 1131 is provided on the edge of outer protective plate 113, corresponding to and exposing protrusion 14. By avoiding protrusion 14, protrusion 14 can protrude from the surface of box side plate 11 away from receiving cavity 101, ensuring structural strength and facilitating connection of lifting point structure 15. In addition, by avoiding protrusion 14, even if outer protective plate 113 is replaced, it is not necessary to disassemble lifting point structure 15, which facilitates maintenance.

[0064] For the side panel 11 of the enclosure equipped with the explosion-proof valve 20, the outer protective plate 113 supports the explosion-proof valve 20. The outer protective plate 113 has a receiving hole 1132, through which the explosion-proof valve 20 passes so that the exhaust chamber of the explosion-proof valve 20 is connected to the exhaust channel 111.

[0065] The battery housing 10 also includes an inner protective plate 16, which is located on the side of the housing side panel 11 facing the accommodating cavity 101. The inner protective plate 16 blocks the vent 112, and a thinned area is provided on the inner protective plate 16 corresponding to the vent 112. When the battery cell 30 experiences thermal runaway, the high-temperature airflow in the accommodating cavity 101 breaks through the thinned area on the inner protective plate 16 and enters the vent channel 111, flowing along the vent channel 111 to the position of the explosion-proof valve 20. By providing the inner protective plate 16, the battery cell 30 is separated from the battery housing 10, thus protecting the battery cell 30.

[0066] The inner liner 16 is thinner to facilitate airflow penetration and directional guidance of airflow into the exhaust channel. Exemplarily, the thickness of the inner liner 16 is 0.3mm-0.6mm, for example, 0.5mm. The thickness of the thinned area can be set to 0.1mm-0.2mm to provide protection within a limited space without significantly increasing weight.

[0067] In some embodiments, a single explosion-proof valve 20 is provided, located in the middle of the side panel 11 of the enclosure on which it is located. In some embodiments, at least two explosion-proof valves 20 are provided, and are distributed at intervals on the side panel 11 of the enclosure on which they are located. For example, see Figure 6 , Figure 8 , Figure 13 and Figure 14 Two explosion-proof valves 20 are provided, spaced apart along the second direction on the side plate 11 of the enclosure. Inside the exhaust channel 111 of the side plate 11 where the explosion-proof valves 20 are located, a partition 17 is installed. The partition 17 divides the exhaust channel 111 into two sub-cavities 114 arranged along the second direction. Each sub-cavity 114 corresponds to one explosion-proof valve 20. A connecting hole 171 is provided on the partition 17, connecting the two sub-cavities 114. By providing the partition 17, the structural strength is increased. The connecting hole 171 on the partition 17 connects the two sub-cavities 114, allowing gas in one sub-cavity 114 to flow to the other sub-cavity 114. The simultaneous exhaust by the two explosion-proof valves 20 increases the exhaust efficiency. Meanwhile, the design of dual explosion-proof valves 20 and connecting holes 171 enables redundant design of the explosion-proof valves 20. Even if one explosion-proof valve 20 fails, the connecting holes 171 of the partition 17 can still balance the air pressure to start the other explosion-proof valve 20, thus improving overall reliability.

[0068] Among them, cell 30 can be a pouch cell, a blade cell, or a square aluminum-cased cell, and there are no restrictions.

[0069] See Figures 3 to 6A crossbeam 40 is provided inside the accommodating cavity 101, extending along a second direction to divide the accommodating cavity 101 into an electrical cavity 1011 and a cell cavity 1012. An exhaust channel 111 is arranged around the periphery of the cell cavity 1012 away from the electrical cavity 1011. An explosion-proof valve 20 is arranged at the end of the cell cavity 1012 away from the electrical cavity 1011, which can increase the distance between the explosion-proof valve 20 and the thermal runaway cell, reducing the risk of thermal runaway. Thermal runaway is caused by the accumulation of heat inside the cell 30, leading to a temperature rise and energy release. Since the electrical cavity 1011 does not require venting, by arranging the exhaust channel 111 around the periphery of the cell cavity 1012, the venting requirements can be met without occupying additional space in the accommodating cavity 101, thereby increasing the volumetric energy density and ensuring the overall strength of the battery box 10.

[0070] In this embodiment, at least two suspension point structures 15 are provided on one side of the battery box 10. One suspension point structure 15 is located directly opposite the crossbeam 40, and a suspension point structure 15 is provided between two adjacent exhaust holes 112 to ensure the balanced force on the battery box 10.

[0071] See Figure 13 , Figures 15 to 18 A through hole 41 is provided along the third direction of the upper edge of the crossbeam 40. The battery pack also includes an upper cooling plate 51 and a lower cooling plate 52. The upper cooling plate 51 is connected to one end of the through hole 41 through an upper connector 53, and the lower cooling plate 52 is connected to the other end of the through hole 41 through a lower connector 54. By providing the through hole 41 inside the crossbeam 40, the internal space of the crossbeam 40 is fully utilized. The upper cooling plate 51 and the lower cooling plate 52 are connected by the through hole 41 to realize the circulation of the liquid cooling system, avoid the use of T-joints which occupy space, reduce costs, and ensure structural compactness.

[0072] The upper connector 53 and the lower connector 54 are sealed together to prevent leakage of the cooling medium. Exemplarily, a groove 42 is provided around the periphery of the through hole 41 for housing the first sealing element 55. At least two fixing holes 43 are provided on the outside of the groove 42. Fasteners 60 engage with the fixing holes 43 to securely seal the upper connector 53 and the lower connector 54. By using fasteners 60, the upper cooling plate 51 and the lower cooling plate 52 are securely connected to the crossbeam 40, causing the upper connector 53 and the lower connector 54 to abut against the first sealing element 55, thus achieving a seal.

[0073] At least a portion of the upper connector 53 is inserted into the through hole 41. A second sealing element 56 is provided between the outer wall of the upper connector 53 and the inner wall of the through hole 41 to achieve a seal. Through the cooperation of the first sealing element 55 and the second sealing element 56, a double seal is achieved between the upper connector 53 and the through hole 41 to ensure good sealing performance. At least a portion of the lower connector 54 is inserted into the through hole 41. A second sealing element 56 is provided between the outer wall of the lower connector 54 and the inner wall of the through hole 41 to achieve a seal. Through the cooperation of the first sealing element 55 and the second sealing element 56, a double seal is achieved between the lower connector 54 and the through hole 41 to ensure good sealing performance.

[0074] For example, the first sealing member 55 is a sealing ring and is embedded in the groove 42. In some embodiments, the groove 42 is annular, and the corresponding first sealing member 55 is annular. In this embodiment, the groove 42 includes an annular positioning groove 421 and a limiting groove 422 communicating with the positioning groove 421. The limiting groove 422 is disposed on a portion of the outer periphery of the positioning groove 421, and at least a portion of the first sealing member 55 is engaged in the limiting groove 422 to restrict the first sealing member 55 from rotating circumferentially, thereby improving the sealing effect.

[0075] For example, the second seal 56 is a sealing ring and is fitted around the outer periphery of the upper connector 53 and the lower connector 54. The outer periphery of the upper connector 53 and the lower connector 54 may be provided with grooves to accommodate part of the second seal 56.

[0076] The crossbeam 40 includes a thickened portion 44, with a through hole 41 disposed within it. The thickened portion 44 has a significant thickness, increasing the structural strength of the crossbeam 40 and preventing damage from the through hole 41. Fasteners 60 are connected to the thickened portion 44, facilitating the installation of fixing holes 43 and ensuring a secure connection between the crossbeam 40 and the upper and lower cold plates 51 and 52. The thickness of other parts of the crossbeam 40 is less than the thickness of the thickened portion 44, with the first direction being the thickness direction of the crossbeam 40.

[0077] The crossbeam 40 is provided with two through holes 41, one for liquid inlet and the other for liquid outlet, so that the liquid can circulate inside the upper cooling plate 51 and the lower cooling plate 52, thereby improving the heat dissipation effect. The battery pack also includes a liquid inlet pipe 57 and a liquid outlet pipe 58. The liquid inlet pipe 57 is connected to one through hole 41, and the liquid outlet pipe 58 is connected to the other through hole 41.

[0078] The upper cooling plate 51 is connected to the battery housing 10 via fasteners 60. Multiple fasteners 60 are provided; some fasteners 60 are connected to the crossbeam 40, and some are connected to the side plate 11 of the housing. For example, the fasteners 60 are screws. Thermally conductive structural adhesive is applied between the upper cooling plate 51 and the battery cell 30 to achieve a thermally conductive connection, facilitating timely heat dissipation from the battery cell 30 by the upper cooling plate 51. The lower cooling plate 52 can be welded to the battery housing 10. Thermally conductive structural adhesive is also applied between the lower cooling plate 52 and the battery cell 30 to achieve a thermally conductive connection, facilitating timely heat dissipation from the battery cell 30 by the lower cooling plate 52. The bottom plate 12 of the housing is located outside the lower cooling plate 52, protecting the lower cooling plate 52 and providing thermal insulation to reduce temperature changes and ensure effective heat dissipation. See also... Figure 1 The battery pack also includes a service plate 18, which is connected to the upper cooling plate 51 and encloses the electrical cavity 1011. Disassembling the service plate 18 facilitates the repair of electrical components inside the electrical cavity 1011. The service plate 18 and the upper cooling plate 51 are connected by screws for easy installation and removal.

[0079] Through the synergistic effect of the upper cooling plate 51, the lower cooling plate 52 and the exhaust channel 111, the liquid cooling plate and the exhaust path form complementary thermal management. Under normal operating conditions, the liquid cooling plate maintains the uniform temperature of the battery cell. In the event of thermal runaway, the exhaust channel 111 quickly releases heat to prevent the liquid cooling pipeline from overheating and failing.

[0080] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The battery box (10) includes a box side plate (11) and a box bottom plate (12). The box side plate (11) and the box bottom plate (12) form a cavity (101) for placing the battery cell (30). At least a portion of the box side plate (11) is provided with an exhaust channel (111). A group of oppositely arranged box side plates (11) are provided with a plurality of exhaust holes (112) communicating with the exhaust channel (111) on the side facing the cavity (101). An explosion-proof valve (20) is disposed on one of the other set of oppositely disposed side plates (11) of the housing. The exhaust channel (111) inside the side plate (11) of the housing with the explosion-proof valve (20) is connected to the exhaust channel (111) inside the side plate (11) of the housing with the exhaust hole (112), so as to connect the accommodating cavity (101) with the outside through the exhaust chamber of the explosion-proof valve (20).

2. The battery pack according to claim 1, characterized in that, The plurality of exhaust holes (112) are spaced apart along a first direction. The exhaust channel (111) located between adjacent exhaust holes (112) has a raised reinforcing structure (13) on the inner wall near the receiving cavity (101). The first direction is parallel to the extension direction of the exhaust channel (111) inside the box side plate (11) where the exhaust holes (112) are located.

3. The battery pack according to claim 2, characterized in that, The width D1 of the exhaust channel (111) corresponding to the exhaust hole (112) is greater than the width D2 of the exhaust channel (111) corresponding to the reinforcing structure (13), so that the width of the exhaust channel (111) changes periodically in the first direction.

4. The battery pack according to claim 2, characterized in that, The reinforcing structure (13) is provided with a protruding boss (14), which is located at one end of the reinforcing structure (13) along a third direction and protrudes from the surface of the box side plate (11) away from the accommodating cavity (101). The boss (14) is used to set the lifting point structure (15).

5. The battery pack according to claim 4, characterized in that, The top wall of the boss (14) serves as the bottom wall of the exhaust channel (111), and the height H1 of the exhaust channel (111) corresponding to the exhaust hole (112) is greater than the height H2 of the exhaust channel (111) corresponding to the reinforcing structure (13).

6. The battery pack according to claim 4, characterized in that, The box side panel (11) includes an outer protective panel (113). The side wall portion of the box side panel (11) facing away from the accommodating cavity (101) forms a window (115) communicating with the exhaust channel (111). The outer protective panel (113) and the window (115) are closedly connected. The window (115) avoids the boss (14), and the edge of the outer protective plate (113) is provided with a notch (1131), the notch (1131) corresponding to expose the boss (14).

7. The battery pack according to claim 1, characterized in that, Two explosion-proof valves (20) are provided and are spaced apart on the side plate (11) of the housing along the second direction. A partition (17) is provided in the exhaust channel (111) inside the side plate (11) of the housing where the explosion-proof valves (20) are provided. The partition (17) divides the exhaust channel (111) into two sub-cavities (114) arranged along the second direction. Each sub-cavity (114) corresponds to one explosion-proof valve (20). A connecting hole (171) is provided on the partition (17) and the connecting hole (171) connects the two sub-cavities (114).

8. The battery pack according to claim 1, characterized in that, A crossbeam (40) is provided inside the accommodating cavity (101). The crossbeam (40) extends along a second direction to divide the accommodating cavity (101) into an electrical cavity (1011) and a cell cavity (1012). The exhaust channel (111) surrounds the cell cavity (1012) away from the electrical cavity (1011). The explosion-proof valve (20) is provided at one end of the cell cavity (1012) away from the electrical cavity (1011).

9. The battery pack according to claim 8, characterized in that, The crossbeam (40) is provided with a through hole (41) along the third direction. The battery pack also includes an upper cooling plate (51) and a lower cooling plate (52). The upper cooling plate (51) is connected to one end of the through hole (41) through an upper connector (53), and the lower cooling plate (52) is connected to the other end of the through hole (41) through a lower connector (54).

10. The battery pack according to claim 9, characterized in that, The through hole (41) has a groove (42) on its periphery. The groove (42) is used to set the first sealing element (55). At least two fixing holes (43) are provided on the outside of the groove (42). The fastener (60) cooperates with the fixing holes (43) to fasten and seal the upper connector (53) and the lower connector (54).

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