Battery pack

Abstract

The utility model discloses a battery pack, and belongs to the technical field of battery packs. Comprising a box body, a cooling and exhausting assembly and a battery cell, the cooling and exhausting assembly and the box body are connected and define a containing space, the battery cell is arranged in the containing space, and the battery cell comprises an anti-explosion valve; the box body is provided with an inner cavity, and at least one box body exhaust hole is formed in the side, facing the cooling exhaust assembly, of the box body. The cooling and exhausting assembly comprises a cooling plate and a gas collecting plate, the gas collecting plate and the cooling plate are fixedly connected, the gas collecting plate and the cooling plate are stacked and define a containing cavity, the anti-explosion valve faces the containing cavity, and the containing cavity is communicated with the inner cavity through the box body exhaust hole. In practical application, the gas collecting plate and the cooling plate are stacked and form the accommodating cavity in a surrounding manner, so that cooling of the battery cell and pressure relief and thermoelectric separation of the battery pack are taken into consideration, and the battery pack has the beneficial effects of reducing the cost of the battery pack and reducing the weight of the battery pack.

Description

Technical Field

[0001] The present application belongs to the technical field of battery packs, and specifically relates to a battery pack. Background Art

[0002] Existing battery packs typically use liquid cooling to cool the battery cells. Battery pack design requires consideration not only of the liquid cooling components but also of the release of ejecta when the battery cells release pressure due to internal high pressure. When a battery cell experiences thermal runaway, the high-temperature, high-pressure material ejected through the explosion-proof valve can come into contact with other healthy cells, electrical components, and wiring harnesses, potentially short-circuiting healthy cells, inducing thermal runaway, burning and damaging electrical components and wiring harnesses, and in severe cases, causing the battery pack to catch fire and explode.

[0003] In the prior art, battery packs with bottom pressure relief usually use the entire cavity area above the bottom guard plate as a pressure relief zone for high-temperature and high-pressure materials. However, on the one hand, the setting of the above-mentioned pressure relief zone does not provide directional guidance for the high-temperature and high-pressure materials, affecting the exhaust efficiency; on the other hand, using the entire cavity area above the bottom guard plate as a pressure relief zone not only makes sealing difficult and has low sealing reliability, but is also not conducive to improving the space utilization of the battery pack. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a battery pack that can solve the problem in the prior art that the battery pack has poor exhaust effect on high-temperature and high-pressure substances, and that high-temperature and high-pressure substances have a negative impact on other components in the battery pack.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application provides a battery pack having a first direction, a second direction and a third direction, the battery pack comprising a case, a cooling exhaust assembly and a battery cell, the cooling exhaust assembly and the case being connected and enclosed to form a accommodating space, the battery cell being arranged in the accommodating space, the battery cell comprising an explosion-proof valve; the case having an inner cavity, and at least one case exhaust hole being provided on a side of the case facing the cooling exhaust assembly; the cooling exhaust assembly comprising a cooling plate and an air collecting plate, the air collecting plate and the cooling plate being fixedly connected, the air collecting plate and the cooling plate being stacked and enclosed to form a accommodating cavity; wherein, the explosion-proof valve is arranged toward the accommodating cavity, and the accommodating cavity and the inner cavity are connected through the case exhaust hole.

[0007] In an embodiment of the present application, the accommodation space is provided for accommodating the battery cells, and the cooling exhaust assembly is provided for achieving the cooling function of the battery cells and when thermal runaway occurs in the battery cells, the high-temperature and high-pressure ejecta can be directional-emitted through the cooling exhaust assembly, thereby avoiding negative impacts on other components in the battery pack and improving the safety of the battery pack. Specifically, the cooling plate is provided for accommodating the cooling medium to achieve cooling of the battery cells, and the gas collecting plate is provided for providing a flow space for the high-temperature and high-pressure ejecta to achieve directional flow of the high-temperature and high-pressure ejecta. Furthermore, the gas collecting plate and the cooling plate are stacked. In actual applications, when the battery cells are in thermal runaway, the explosion-proof valve of the battery cells is pushed open by the high-temperature and high-pressure ejecta, and the ejecta enters the accommodation chamber and enters the inner cavity along the exhaust hole of the box body, which has the effect of achieving directional discharge of the high-temperature and high-pressure ejecta. Furthermore, the high-temperature and high-pressure eruptive material entering the inner cavity has the beneficial effect of preventing the high-temperature and high-pressure eruptive material from moving disorderly between the battery cells and the box body, affecting the health of other battery cells. On the other hand, the setting of high-temperature and high-pressure eruptive material entering the inner cavity no longer requires the entire cavity area above the bottom guard plate of the battery pack to be used as a pressure relief area, which reduces the sealing difficulty, improves the sealing reliability, and also improves the space utilization of the battery pack.

[0008] In the embodiment of the present application, the gas collecting plate and the cooling plate are stacked and enclosed to form a accommodating cavity, which takes into account both the cooling of the battery cells and the pressure relief and thermal separation of the battery pack, and has the beneficial effect of reducing the cost and weight of the battery pack.

[0009] In addition, when the high-temperature and high-pressure ejecta flows in the containing chamber, the cooling plate can also cool the high-temperature and high-pressure ejecta.

[0010] Optionally, in an embodiment of the present application, the cooling plate is provided with a plurality of pressure relief holes and at least one exhaust hole, the plurality of pressure relief holes are arranged in an array along the first direction and the second direction, the exhaust hole is arranged between two adjacent pressure relief holes along the first direction, and / or the exhaust hole is arranged at the end of a line connecting the plurality of pressure relief holes along the first direction; wherein, the pressure relief holes and the exhaust holes are spaced apart from each other, the explosion-proof valve and the accommodating chamber are connected through the pressure relief holes, and the accommodating chamber and the inner cavity are connected through the exhaust holes.

[0011] Optionally, in an embodiment of the present application, the cooling plate includes a first plate body and a second plate body arranged relative to each other along the third direction, and the first plate body and the second plate body are sealed and connected; the first plate body is connected to the battery cell, and the second plate body and the gas collecting plate are welded to enclose and form the accommodating cavity; the pressure relief hole includes a first pressure relief hole and a second pressure relief hole, and the first pressure relief hole and the second pressure relief hole are correspondingly arranged and adapted, the first pressure relief hole is opened in the first plate body, and the second pressure relief hole is opened in the second plate body; wherein, the first pressure relief hole and the explosion-proof valve are correspondingly arranged, and the second pressure relief hole is connected to the accommodating cavity.

[0012] Optionally, in an embodiment of the present application, the cooling plate includes a first plate body and a second plate body arranged opposite to each other along the third direction, and the first plate body and the second plate body are sealed and connected; the exhaust hole includes a first exhaust hole and a second exhaust hole, the first exhaust hole and the second exhaust hole are correspondingly arranged and adapted, the first exhaust hole is opened in the first plate body, and the second exhaust hole is opened in the second plate body; wherein, the first exhaust hole is connected to the box exhaust hole, and the second exhaust hole is connected to the accommodating cavity.

[0013] Optionally, in an embodiment of the present application, the first plate body and the second plate body are enclosed to form a cooling channel, which is used to accommodate a cooling medium, and the first pressure relief hole of the first plate body, the second pressure relief hole of the second plate body, the first exhaust hole of the first plate body, and the second exhaust hole of the second plate body are all separated from the cooling channel.

[0014] Optionally, in an embodiment of the present application, the second plate body includes a flow channel protrusion, a flow channel recess and a flow channel connecting portion, the flow channel protrusion protrudes along the third direction away from the first plate body, and the flow channel recess is recessed along the third direction away from the first plate body; the flow channel recess is connected to the first plate body, the flow channel protrusion has a preset interval with the first plate body along the third direction to form a cooling flow channel, and the flow channel protrusion and the flow channel recess are connected via the flow channel connecting portion.

[0015] Optionally, in an embodiment of the present application, the gas collecting plate includes a conducting portion and a plurality of gas collecting portions, the plurality of gas collecting portions extend along the first direction and are arranged in sequence at intervals along the second direction, the conducting portion extends along the second direction, and the conducting portion and the plurality of gas collecting portions are all connected; wherein, the exhaust hole of the box body is connected to the gas collecting plate and is arranged corresponding to the gas collecting portion.

[0016] Optionally, in an embodiment of the present application, the gas collecting plate further includes an gas collecting plate protrusion, an gas collecting plate extension and an gas collecting plate connecting portion, and the sides of the conducting portion are connected to the gas collecting plate protrusion; the gas collecting plate extension portion is arranged on the outer periphery of the gas collecting plate, and the gas collecting plate extension portion extends a preset distance in the direction away from the gas collecting portion along the plane where the first direction and the second direction are located; the gas collecting plate protrusion protrudes from the gas collecting portion along the third direction toward the direction close to the cooling plate, the gas collecting plate protrusion and the flow channel recessed portion of the second plate body fit together and are sealed connected, and the gas collecting plate extension and the gas collecting plate protrusion are connected through the gas collecting plate connecting portion; wherein, the flow channel connecting portion of the second plate body and the gas collecting plate connecting portion fit together and are sealed connected, and the flow channel protrusion of the second plate body and the gas collecting plate extension fit together and are sealed connected.

[0017] Optionally, in an embodiment of the present application, the cooling exhaust assembly further includes an air guide structure, the air collecting plate includes a plurality of air collecting portions, the plurality of air collecting portions extend along the first direction and are arranged in sequence at intervals along the second direction, the air guide structure extends along the second direction, and two adjacent air collecting portions are connected through the air guide structure; wherein, the box exhaust hole and the air collecting portion are connected.

[0018] Optionally, in an embodiment of the present application, the air guide structure includes an air guide tube and an overlapping portion, the air guide tube extends along the second direction, the two overlapping portions are connected to the two ends of the air guide tube, the air guide tube is provided with an air guide channel, the air collecting plate is provided with an air guide port, the overlapping portion is connected to the air guide port, and the overlapping portion and the air guide port are fitted and sealed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the exploded structure of the battery pack in an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of the cross-sectional structure of a battery pack in an embodiment of the present application;

[0021] Figure 3 In the embodiment of this application Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 4 This is a schematic structural diagram of the first plate body in an embodiment of the present application;

[0023] Figure 5 This is a schematic structural diagram of the second plate in an embodiment of the present application;

[0024] Figure 6 In the embodiment of this application Figure 5 Schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 7 This is a schematic structural diagram of the gas collecting plate in an embodiment of the present application;

[0026] Figure 8 In the embodiment of this application Figure 7 Schematic diagram of the enlarged structure at C in the middle;

[0027] Figure 9 This is a schematic structural diagram of the gas collecting plate and the second plate in an embodiment of the present application;

[0028] Figure 10 In the embodiment of this application Figure 9 Schematic diagram of the enlarged structure at D in the middle;

[0029] Figure 11 This is a structural diagram of the box in the embodiment of the present application;

[0030] Figure 12 This is another structural diagram of the box in the embodiment of the present application;

[0031] Figure 13 This is a schematic diagram of the structure of the battery cell in the embodiment of the present application;

[0032] Figure 14 This is a schematic diagram of the explosion structure of another battery pack in an embodiment of the present application;

[0033] Figure 15 is a schematic diagram of the cross-sectional structure of another battery pack in an embodiment of the present application;

[0034] Figure 16 In the embodiment of this application Figure 15 Schematic diagram of the enlarged structure at E in the middle;

[0035] Figure 17 This is a schematic diagram of the position structure of the gas collecting plate and the gas guide structure in the embodiment of the present application;

[0036] Figure 18 This is a schematic diagram of the gas collecting plate structure of another battery pack in an embodiment of the present application;

[0037] Figure 19 This is a schematic structural diagram of the airway tube in an embodiment of the present application;

[0038] Figure 20 In the embodiment of this application Figure 19 Schematic diagram of the enlarged structure at F in the middle;

[0039] Figure 21 It is a partial enlarged view of the gas collecting portion in the embodiment of the present application.

[0040] Description of reference numerals:

[0041] 10. Box; 11. Accommodation space; 111. Inner cavity; 112. Box exhaust hole; 20. Cooling exhaust assembly; 21. Cooling plate; 211. First plate; 2111. First pressure relief hole; 2112. First exhaust hole; 212. Second plate; 2121. Second pressure relief hole; 2122. Second exhaust hole; 2123. Flow channel protrusion; 2124. Flow channel recess; 2125. Flow channel joint Connecting part; 213, cooling channel; 22, gas collecting plate; 221, conducting part; 222, gas collecting part; 223, gas collecting plate protrusion; 224, gas collecting plate extension; 225, gas collecting plate connecting part; 226, air guide port; 23, accommodating cavity; 24, air guide structure; 241, air guide pipe; 242, overlapping part; 30, battery cell; 31, explosion-proof valve; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0044] In this application, the term "parallel" includes not only absolute parallelism but also the generally recognized parallelism in engineering practice, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. At the same time, "perpendicular" also includes not only absolute perpendicularity but also the generally recognized perpendicularity in engineering practice, such as "perpendicular" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only absolute equality but also the generally recognized equality in engineering practice, which may include a certain error, such as a tolerance range of -1% to 1%.

[0045] The battery pack provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0046] See also Figures 1 to 21 A battery pack has a first direction X, a second direction Y and a third direction Z, the battery pack includes a case 10, a cooling and exhaust assembly 20 and a battery cell 30, the cooling and exhaust assembly 20 and the case 10 are connected and enclosed to form a accommodating space 11, the battery cell 30 is arranged in the accommodating space 11, and the battery cell 30 includes an explosion-proof valve 31; the case 10 has an inner cavity 111, and at least one case exhaust hole 112 is opened on the side of the case 10 facing the cooling and exhaust assembly 20; the cooling and exhaust assembly 20 includes a cooling plate 21 and an air collecting plate 22, the air collecting plate 22 and the cooling plate 21 are fixedly connected, the air collecting plate 22 and the cooling plate 21 are stacked, and enclosed to form a accommodating cavity 23; wherein, the explosion-proof valve 31 is arranged toward the accommodating cavity 23, and the accommodating cavity 23 and the inner cavity 111 are connected through the case exhaust hole 112.

[0047] In the embodiment of the present application, the first direction X is the length direction of the battery pack, the second direction Y is the width direction of the battery pack, and the third direction Z is the height direction of the battery pack. The accommodation space 11 is configured to accommodate the battery cell 30. The cooling exhaust assembly 20 is configured to cool the battery cell 30 and, when thermal runaway occurs in the battery cell 30, the high-temperature and high-pressure ejecta can be directional-emitted through the cooling exhaust assembly 20, thereby avoiding negative impacts on other components in the battery pack and improving the safety of the battery pack. Specifically, the cooling plate 21 is configured to accommodate a cooling medium to cool the battery cell 30, and the gas collecting plate 22 is configured to provide a flow space for the high-temperature and high-pressure ejecta to achieve directional flow of the high-temperature and high-pressure ejecta. Furthermore, the gas collecting plate 22 and the cooling plate 21 are stacked. In actual use, when a battery cell 30 experiences thermal runaway, the explosion-proof valve 31 of the battery cell 30 is pushed open by the high-temperature, high-pressure eruption, and the eruption enters the containment chamber 23 and then flows into the inner cavity 111 through the housing vent 112, achieving a targeted discharge of the high-temperature, high-pressure eruption. Furthermore, the high-temperature, high-pressure eruption entering the inner cavity 111 has the beneficial effect of preventing it from randomly moving between the battery cell 30 and the housing 10 and potentially affecting the health of other battery cells 30. Furthermore, the arrangement in which the high-temperature, high-pressure eruption enters the inner cavity 111 eliminates the need to use the entire cavity area above the battery pack's bottom guard plate as a pressure relief zone, reducing sealing difficulty, improving sealing reliability, and increasing the battery pack's space utilization.

[0048] In the embodiment of the present application, the gas collecting plate 22 and the cooling plate 21 are stacked and enclosed to form a accommodating cavity 23, which takes into account both cooling of the battery cell 30 and pressure relief and thermal separation of the battery pack, and has the beneficial effect of reducing the cost and weight of the battery pack.

[0049] In addition, when the high-temperature and high-pressure eruption flows in the accommodating chamber 23, the cooling plate 21 can also cool the high-temperature and high-pressure eruption.

[0050] Optionally, in an embodiment of the present application, the cooling plate 21 is provided with a plurality of pressure relief holes and at least one exhaust hole, the plurality of pressure relief holes are arranged in an array along the first direction X and the second direction Y, the exhaust hole is arranged between two adjacent pressure relief holes along the first direction X, and / or the exhaust hole is arranged at the end of a line connecting the plurality of pressure relief holes along the first direction X; wherein the pressure relief holes and the exhaust holes are spaced apart from each other, the explosion-proof valve 31 and the accommodating chamber 23 are connected through the pressure relief holes, and the accommodating chamber 23 and the inner cavity 111 are connected through the exhaust holes.

[0051] In the embodiment of the present application, the pressure relief hole is provided to connect the accommodating chamber 23 and the explosion-proof valve 31, and the exhaust hole is provided to connect the accommodating chamber 23 and the inner cavity 111. In actual application, the high-temperature and high-pressure ejecta pushes open the explosion-proof valve 31 of the battery cell 30 and flows from the pressure relief hole into the accommodating chamber 23. After flowing through the accommodating chamber 23, it flows to the exhaust hole, and finally flows to the inner cavity 111 through the exhaust hole. This achieves the directional discharge of the high-temperature and high-pressure gas, improves the gas discharge efficiency, and at the same time, prevents the high-temperature and high-pressure ejecta from coming into contact with other normal battery cells 30, electrical components, and various wiring harnesses, causing short circuits in normal battery cells 30, inducing thermal runaway, burning and damaging electrical components and wiring harnesses, etc., thereby improving the reliability of the battery pack.

[0052] Optionally, in an embodiment of the present application, the cooling plate 21 includes a first plate body 211 and a second plate body 212 arranged relative to each other along a third direction Z, and the first plate body 211 and the second plate body 212 are sealed and connected; the first plate body 211 is connected to the battery cell 30, and the second plate body 212 and the gas collecting plate 22 are welded to enclose and form a accommodating cavity 23; the pressure relief hole includes a first pressure relief hole 2111 and a second pressure relief hole 2121, and the first pressure relief hole 2111 and the second pressure relief hole 2121 are correspondingly arranged and adapted, the first pressure relief hole 2111 is opened on the first plate body 211, and the second pressure relief hole 2121 is opened on the second plate body 212; wherein, the first pressure relief hole 2111 and the explosion-proof valve 31 are correspondingly arranged, and the second pressure relief hole 2121 is connected to the accommodating cavity 23.

[0053] In the embodiment of the present application, the first plate 211 is in contact with the battery cell 30. It can be understood that the second plate 212 is arranged on the side of the first plate 211 away from the battery cell 30. The second plate 212 and the gas collecting plate 22 enclose a accommodating cavity 23. In actual applications, the sealed connection between the first plate 211 and the second plate 212 can be used to accommodate a cooling medium, and the battery cell 30 is connected to the first plate 211 to realize the cooling function of the cooling plate 21 on the battery cell 30. The first pressure relief hole 2111 is opened in the first plate 211, and the second pressure relief hole 2121 is opened in the second plate 212, and the first pressure relief hole 2111 and the second pressure relief hole 2121 and the explosion-proof valve 31 are correspondingly arranged. It is understandable that in actual application, when thermal runaway occurs in the battery cell 30, the high-temperature and high-pressure eruption material pushes open the explosion-proof valve 31, and the eruption material flows into the accommodating chamber 23 through the first pressure relief hole 2111 and the second pressure relief hole 2121, thereby realizing the directional discharge of the eruption material.

[0054] Optionally, in an embodiment of the present application, the cooling plate 21 includes a first plate body 211 and a second plate body 212 arranged relative to each other along a third direction Z, and the first plate body 211 and the second plate body 212 are sealed and connected; the exhaust hole includes a first exhaust hole 2112 and a second exhaust hole 2122, and the first exhaust hole 2112 and the second exhaust hole 2122 are correspondingly arranged and adapted, the first exhaust hole 2112 is opened in the first plate body 211, and the second exhaust hole 2122 is opened in the second plate body 212; wherein, the first exhaust hole 2112 is connected to the box exhaust hole 112, and the second exhaust hole 2122 is connected to the accommodating cavity 23.

[0055] In the embodiment of the present application, the first vent 2112 is provided to enable communication between the cooling plate 21 and the housing vent 112, while the second vent 2122 is provided to enable communication between the cooling plate 21 and the accommodating chamber 23. These first and second vents 2112, 2122 are provided to discharge the ejected material from the accommodating chamber 23 into the cavity. In actual use, the ejected material flowing into the accommodating chamber 23 will sequentially pass through the second vent 2122, the first vent 2112, and the housing vent 112 into the inner cavity 111, ultimately exiting the battery pack.

[0056] Furthermore, in actual applications, in order to avoid blockage during the flow of the eruption and increase the flow rate, the relationship among the battery cell explosion-proof valve 31, the first pressure relief hole 2111, the second pressure relief hole 2121, the accommodating chamber 23, the first exhaust hole 2112, the second exhaust hole 2122 and the box exhaust hole 112 satisfies: 0.2≤S2111 / S31≤10; 0.2≤S2121 / S31≤10; 0.2≤S23-a / S31≤10; 0.2≤S23-b / S31≤10; 0.2≤S2112 / S31≤10; 0.2≤S2122 / S31≤10; 0.2≤S112 / S31≤10.

[0057] Among them, S31 is the opening area of ​​the battery core explosion-proof valve 31, S2111 is the opening area of ​​the first pressure relief hole 2111, S2121 is the opening area of ​​the second pressure relief hole 2121, S2112 is the opening area of ​​the first exhaust hole 2112, S2122 is the opening area of ​​the second exhaust hole 2122, S112 is the opening area of ​​the box exhaust hole 112, and S23-a is the opening area of ​​the accommodating chamber 23. Figure 7 The cross-sectional area of ​​the dotted line mark a of the gas collecting plate 22 is shown in FIG. S23-b is the cross-sectional area of ​​the accommodating cavity 23 at Figure 7 The cross-sectional area of ​​the gas collecting plate 22 is shown at the dotted line mark b.

[0058] Optionally, in an embodiment of the present application, the first plate body 211 and the second plate body 212 enclose a cooling channel 213, which is used to accommodate a cooling medium. The first pressure relief hole 2111 of the first plate body 211, the second pressure relief hole 2121 of the second plate body 212, the first exhaust hole 2112 of the first plate body 211, and the second exhaust hole 2122 of the second plate body 212 are all separated from the cooling channel 213.

[0059] In an embodiment of the present application, the first plate 211 and the second plate 212 can also enclose a cooling channel 213, and the setting of the cooling channel 213 is used to realize the cooling function of the battery cell 30. Specifically, the cooling channel 213 can accommodate a cooling medium. Furthermore, since the ejecta will flow through the first pressure relief hole 2111, the second pressure relief hole 2121, the first exhaust hole 2112 and the second exhaust hole 2122 during the directional discharge process, in order to avoid mutual interference between the cooling channel 213 and the ejecta during the discharge process, the first pressure relief hole 2111, the second pressure relief hole 2121, the first exhaust hole 2112 and the second exhaust hole 2122 used for the directional discharge of the ejecta are all separated from the cooling channel 213.

[0060] Optionally, in an embodiment of the present application, the second plate body 212 includes a flow channel protrusion 2123, a flow channel recessed portion 2124 and a flow channel connecting portion 2125, the flow channel protrusion 2123 protrudes along the third direction Z away from the first plate body 211, and the flow channel recessed portion 2124 is recessed along the third direction Z away from the first plate body 211; the flow channel recessed portion 2124 is in contact with the first plate body 211, the flow channel protrusion 2123 has a preset interval with the first plate body 211 along the third direction Z to form a cooling flow channel 213, and the flow channel protrusion 2123 and the flow channel recessed portion 2124 are connected by the flow channel connecting portion 2125.

[0061] In the embodiment of the present application, the flow channel protrusion 2123, the flow channel recess 2124, and the flow channel connection portion 2125 are configured to implement the flow channel structure. Together with the first plate 211, they define the shape of the flow channel to achieve directional discharge of ejected material. Specifically, the flow channel protrusion 2123 and the first plate 211 are spaced apart along the third direction Z to form the cooling flow channel 213. In practice, the cooling flow channel 213 is configured to provide a flow path for the cooling medium.

[0062] Optionally, in an embodiment of the present application, the gas collecting plate 22 includes a conducting portion 221 and a plurality of gas collecting portions 222, the plurality of gas collecting portions 222 extend along the first direction X and are arranged in sequence at intervals along the second direction Y, the conducting portion 221 extends along the second direction Y, and the conducting portion 221 and the plurality of gas collecting portions 222 are all connected; wherein, the box exhaust hole 112 is connected to the gas collecting plate 22 and is arranged corresponding to the gas collecting portion 222.

[0063] In the embodiment of the present application, a box exhaust hole 112 can be provided on the box 10 at a position corresponding to each gas collecting portion 222. The box exhaust hole 112, the first exhaust hole 2112 and the second exhaust hole 2122 cooperate to connect the inner cavity 111 and the accommodating cavity 23. Because the multiple conductive parts 221 connect each gas collecting portion 222, when any battery cell 30 has a thermal runaway, the high-temperature and high-pressure gas ejected flows into the accommodating cavity 23, and can be exhausted in parallel in multiple paths according to the paths of the multiple gas collecting portions 222, the multiple first exhaust holes 2112, the multiple second exhaust holes 2122, the multiple box exhaust holes 112, and the inner cavity 111. Not only can directional exhaust be performed along a fixed path, but the exhaust efficiency is also greatly improved. When the space requirement for arranging the internal structural parts of the box 10 is limited, it is impossible to provide each air collecting section 222 with a box exhaust hole 112 to cooperate with the exhaust. Because multiple conductive parts 221 connect each air collecting section 222, a parallel exhaust solution can be implemented in which multiple air collecting sections 222 share one box exhaust hole 112 for exhaust, thereby meeting the thermoelectric separation pressure relief requirements.

[0064] Optionally, in the embodiment of the present application, the gas collecting plate 22 further includes a gas collecting plate protrusion 223, a gas collecting plate extension 224 and a gas collecting plate connection portion 225, and the sides of the conducting portion 221 are connected to the gas collecting plate protrusion 223; the gas collecting plate extension 224 is arranged on the outer periphery of the gas collecting plate 22, and the gas collecting plate extension 224 extends a preset distance in the direction away from the gas collecting portion 222 along the plane where the first direction X and the second direction Y are located; the gas collecting plate protrusion 223 is close to the cooling plate 2 along the third direction Z 1 protrudes from the gas collecting portion 222, the gas collecting plate protrusion 223 and the flow channel recessed portion 2124 of the second plate body 212 fit together and are sealed, and the gas collecting plate extension portion 224 and the gas collecting plate protrusion 223 are connected through the gas collecting plate connecting portion 225; wherein, the flow channel connecting portion 2125 of the second plate body 212 and the gas collecting plate connecting portion 225 fit together and are sealed, and the flow channel protrusion 2123 of the second plate body 212 and the gas collecting plate extension 224 fit together and are sealed.

[0065] In the embodiment of the present application, the gas collecting plate protrusion 223 and the flow channel recess 2124 are fitted and sealed together, and the gas collecting plate extension 224 and the flow channel protrusion 2123 are fitted and sealed together. A gas collecting plate connecting portion 225 is provided at the connection between the gas collecting plate protrusion 223 and the gas collecting plate extension 224, and a flow channel connecting portion 2125 is provided at the connection between the flow channel protrusion 2123 and the flow channel recess 2124. Furthermore, the gas collecting plate connecting portion 225 and the flow channel connecting portion 2125 are designed to conform to the shape, that is, the shape of the gas collecting plate connecting portion 225 always remains consistent with the flow channel connecting portion 2125. At the contact position between the gas collecting plate connecting portion 225 and the flow channel connecting portion 2125, the gas collecting plate connecting portion 225 and the flow channel connecting portion 2125 have the same profile, thereby ensuring that the two can be completely fitted and sealed together. On this basis, all contact surfaces between the gas collecting plate 22 and the second plate body 212 can be completely fitted together to ensure a sealing effect.

[0066] Optionally, in an embodiment of the present application, the cooling exhaust assembly 20 further includes an air guide structure 24, the air collecting plate 22 includes a plurality of air collecting portions 222, the plurality of air collecting portions 222 extend along the first direction X, and are arranged in sequence at intervals along the second direction Y, the air guide structure 24 extends along the second direction Y, and two adjacent air collecting portions 222 are connected through the air guide structure 24; wherein, the box exhaust hole 112 and the air collecting portion 222 are connected.

[0067] In the embodiment of the present application, two adjacent air collecting sections 222 are connected by an air guide structure 24, which implements a series exhaust solution between multiple air collecting sections 222. The air guide structure 24 is provided to connect the air collecting plate 22 and the exhaust holes 112 of the box body. The configuration of the air guide structure 24 is not limited to the cooling plate 21, thus providing high flexibility. Specifically, both ends of the air guide structure 24 are connected to the air collecting sections 222, thereby achieving a connection between the two air collecting sections 222.

[0068] Optionally, in an embodiment of the present application, the air guide structure 24 includes an air guide tube 241 and a lap joint 242, the air guide tube 241 extends along the second direction Y, the two lap joints 242 are connected to the two ends of the air guide tube 241, and the air guide tube 241 is provided with an air guide channel; the air collecting plate 22 is provided with an air guide port 226, the lap joint 242 is connected to the air guide port 226, and the lap joint 242 and the air guide port 226 are surface-fitted and sealed.

[0069] In the embodiment of the present application, the overlapping portion 242 and the air guide port 226 are designed to conform to the shape of the overlap portion 242, so that the overlapping portion 242 and the air guide port 226 are completely fitted together for a sealed connection. The air guide pipe 241 cooperates with the air guide port 226 to connect adjacent air collecting portions 222. Two adjacent air collecting portions 222 can be connected in series through the air guide pipe 241 for exhaust.

[0070] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0071] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A battery pack having a first direction (X), a second direction (Y), and a third direction (Z), characterized in that: The battery pack comprises a box (10), a cooling exhaust assembly (20) and a battery cell (30), wherein the cooling exhaust assembly (20) and the box (10) are connected and enclosed to form a receiving space (11), the battery cell (30) is arranged in the receiving space (11), and the battery cell (30) comprises an explosion-proof valve (31); The box body (10) has an inner cavity (111), and at least one box body exhaust hole (112) is provided on a side of the box body (10) facing the cooling exhaust assembly (20); The cooling exhaust assembly (20) comprises a cooling plate (21) and an air collecting plate (22), wherein the air collecting plate (22) and the cooling plate (21) are fixedly connected, and the air collecting plate (22) and the cooling plate (21) are stacked and enclosed to form an accommodating cavity (23); The explosion-proof valve (31) is arranged toward the accommodating chamber (23), and the accommodating chamber (23) and the inner chamber (111) are in communication through the box exhaust hole (112).

2. The battery pack according to claim 1, wherein: The cooling plate (21) is provided with a plurality of pressure relief holes and at least one exhaust hole, the plurality of pressure relief holes are arranged in an array along the first direction (X) and the second direction (Y), the exhaust hole is provided between two adjacent pressure relief holes along the first direction (X), and / or the exhaust hole is provided at an end of a line connecting the plurality of pressure relief holes along the first direction (X); The pressure relief hole and the exhaust hole are spaced apart from each other, the explosion-proof valve (31) and the accommodating chamber (23) are connected through the pressure relief hole, and the accommodating chamber (23) and the inner chamber (111) are connected through the exhaust hole.

3. The battery pack according to claim 2, wherein: The cooling plate (21) comprises a first plate body (211) and a second plate body (212) arranged opposite to each other along the third direction (Z), and the first plate body (211) and the second plate body (212) are sealed and connected; The first plate (211) is connected to the battery core (30), and the second plate (212) and the gas collecting plate (22) are welded to enclose and form the accommodating cavity (23); The pressure relief hole comprises a first pressure relief hole (2111) and a second pressure relief hole (2121), the first pressure relief hole (2111) and the second pressure relief hole (2121) are correspondingly arranged and adapted, the first pressure relief hole (2111) is opened on the first plate body (211), and the second pressure relief hole (2121) is opened on the second plate body (212); The first pressure relief hole (2111) and the explosion-proof valve (31) are correspondingly arranged, and the second pressure relief hole (2121) and the accommodating chamber (23) are in communication.

4. The battery pack according to claim 2, wherein: The cooling plate (21) comprises a first plate body (211) and a second plate body (212) arranged opposite to each other along the third direction (Z), and the first plate body (211) and the second plate body (212) are sealed and connected; The exhaust hole comprises a first exhaust hole (2112) and a second exhaust hole (2122), the first exhaust hole (2112) and the second exhaust hole (2122) are correspondingly arranged and adapted to each other, the first exhaust hole (2112) is opened on the first plate body (211), and the second exhaust hole (2122) is opened on the second plate body (212); The first exhaust hole (2112) is in communication with the box exhaust hole (112), and the second exhaust hole (2122) is in communication with the accommodating chamber (23).

5. The battery pack according to claim 3 or 4, characterized in that: The first plate body (211) and the second plate body (212) enclose a cooling channel (213), and the cooling channel (213) is used to accommodate a cooling medium. The first pressure relief hole (2111) of the first plate body (211), the second pressure relief hole (2121) of the second plate body (212), the first exhaust hole (2112) of the first plate body (211), and the second exhaust hole (2122) of the second plate body (212) are all separated from the cooling channel (213).

6. The battery pack according to claim 3 or 4, characterized in that: The second plate (212) comprises a flow channel protrusion (2123), a flow channel recess (2124) and a flow channel connection portion (2125), wherein the flow channel protrusion (2123) protrudes in a direction away from the first plate (211) along the third direction (Z), and the flow channel recess (2124) is recessed in a direction away from the first plate (211) along the third direction (Z); The flow channel recessed portion (2124) is connected to the first plate body (211), the flow channel raised portion (2123) has a preset interval with the first plate body (211) along the third direction (Z) to form a cooling flow channel (213), and the flow channel raised portion (2123) and the flow channel recessed portion (2124) are connected via the flow channel connecting portion (2125).

7. The battery pack according to claim 1, wherein: The gas collecting plate (22) comprises a conducting portion (221) and a plurality of gas collecting portions (222), the plurality of gas collecting portions (222) extending along the first direction (X) and being sequentially spaced along the second direction (Y), the conducting portion (221) extending along the second direction (Y), and the conducting portion (221) and the plurality of gas collecting portions (222) being in communication; The box exhaust hole (112) is connected to the gas collecting plate (22) and is arranged corresponding to the gas collecting portion (222).

8. The battery pack according to claim 7, characterized in that: The gas collecting plate (22) further comprises a gas collecting plate protrusion (223), a gas collecting plate extension portion (224) and a gas collecting plate connection portion (225), and the sides of the conducting portion (221) are all connected to the gas collecting plate protrusion (223); The gas collecting plate extension portion (224) is arranged on the outer periphery of the gas collecting plate (22), and the gas collecting plate extension portion (224) extends a preset distance in a direction away from the gas collecting portion (222) along a plane where the first direction (X) and the second direction (Y) are located; The gas collecting plate protrusion (223) protrudes from the gas collecting portion (222) in the direction close to the cooling plate (21) along the third direction (Z), the gas collecting plate protrusion (223) and the flow channel recess (2124) of the second plate body (212) of the cooling plate (21) are in contact with each other and are sealed, and the gas collecting plate extension (224) and the gas collecting plate protrusion (223) are connected via the gas collecting plate connection portion (225); The flow channel connecting portion (2125) of the second plate body (212) and the gas collecting plate connecting portion (225) are in profile contact and sealed connection.

9. The battery pack according to claim 1, wherein: The cooling exhaust assembly (20) further includes an air guide structure (24); the air collecting plate (22) includes a plurality of air collecting portions (222); the plurality of air collecting portions (222) extend along the first direction (X) and are sequentially spaced apart along the second direction (Y); the air guide structure (24) extends along the second direction (Y); and two adjacent air collecting portions (222) are connected via the air guide structure (24); The box exhaust hole (112) and the air collecting portion (222) are in communication.

10. The battery pack according to claim 9, characterized in that: The air guide structure (24) comprises an air guide tube (241) and a lap joint (242), the air guide tube (241) extends along the second direction (Y), the two lap joints (242) are connected to two ends of the air guide tube (241), and the air guide tube (241) is provided with an air guide channel; The gas collecting plate (22) is provided with a gas guide port (226), the overlapping portion (242) is connected to the gas guide port (226), and the overlapping portion (242) and the gas guide port (226) are in contact with each other and are sealed.

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