Battery pack

Abstract

The utility model discloses a battery pack, which comprises a plurality of battery modules, the plurality of battery modules are arranged at intervals along a first direction, each battery module comprises a plurality of single batteries stacked along a second direction, and the first direction is perpendicular to the second direction; the two sides of each battery module in the first direction are each provided with one sampling element, and the sampling elements extend in the second direction; an accommodating cavity is defined on the inner side of the frame, and the plurality of battery modules are arranged in the accommodating cavity; the middle beam is arranged in the containing cavity, the middle beam extends in the first direction and is connected with the frame, a plurality of grooves penetrating through the middle beam in the second direction are formed in the middle beam, the grooves correspond to the sampling elements in a one-to-one mode, the sampling elements are suitable for being embedded in the grooves, and the sampling elements are connected with the middle beam in a crossed mode. According to the battery pack disclosed by the utility model, more battery monomers can be arranged in an effective space, so that the energy density of the battery pack can be improved.

Description

Technical Field

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

[0002] At present, in order to ensure the structural strength of the battery pack, cross beams and longitudinal beams are generally provided inside the box. The setting of the cross beams divides the battery module into multiple parts, and the battery module needs to be equipped with more collection units. Therefore, the battery pack needs to provide more space for arranging the collection wiring harness and plug-ins, which reduces the effective space inside the battery pack and cannot arrange more battery cells. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery pack, which can arrange more battery cells in an effective space, thereby improving the volume utilization and the energy density of the battery pack.

[0004] According to the utility model, the battery pack includes: a plurality of battery modules, the plurality of battery modules are arranged at intervals along a first direction, the battery modules include a plurality of battery cells stacked along a second direction, the first direction and the second direction are perpendicular to each other; a plurality of sampling elements, each of the battery modules is respectively provided with a sampling element on both sides in the first direction, the sampling element extends along the second direction; a frame, the inner side of the frame defines a accommodating cavity, the plurality of battery modules are arranged in the accommodating cavity; an intermediate beam, the intermediate beam is arranged in the accommodating cavity, the intermediate beam extends along the first direction and is connected to the frame, a plurality of grooves are formed on the intermediate beam and pass through the intermediate beam along the second direction, the plurality of grooves correspond to the plurality of sampling elements one by one, and the sampling elements are suitable for being embedded in the grooves, and the sampling elements are cross-connected with the intermediate beam.

[0005] According to the battery pack of the present invention, by forming a groove on the middle beam, the number of sampling elements arranged can be reduced, thereby reducing the use of components such as wiring harnesses and plug-ins supporting the sampling elements. As a result, more battery cells can be arranged in an effective space, thereby improving the volume utilization and the energy density of the battery pack.

[0006] According to some embodiments of the present invention, the groove is formed in a U shape and passes through the upper end of the middle beam.

[0007] According to some embodiments of the present invention, the middle beam has a plurality of four chambers spaced apart in the up-down direction, and reinforcement members are provided in the two middle chambers.

[0008] According to some embodiments of the utility model, the battery pack also includes: an explosion-proof valve, which is connected to the frame, and the frame includes: a first side beam and a second side beam arranged at intervals along the first direction, the middle beam is connected between the first side beam and the second side beam, and a plurality of first air inlet holes and a first exhaust channel are formed on the first side beam and the second side beam, and the plurality of first air inlet holes are connected to the explosion-proof valve through the first exhaust channel.

[0009] According to some embodiments of the present utility model, a fireproof and heat-insulating layer is provided on a surface of one side on which the first side beam and the second side beam are arranged opposite to each other.

[0010] According to some embodiments of the utility model, the frame includes: a third side beam and a fourth side beam arranged at intervals along the second direction, the third side beam extends along the first direction and is connected to the rear ends of the first side beam and the second side beam, the fourth side beam extends along the first direction and is connected to the front ends of the first side beam and the second side beam, and the explosion-proof valve is arranged on the third side beam.

[0011] According to some embodiments of the utility model, a second air inlet hole and a second exhaust channel are formed on the third side beam, and the second air inlet hole is connected to the explosion-proof valve through the second exhaust channel.

[0012] According to some embodiments of the utility model, the battery pack also includes: at least one longitudinal beam, which is arranged between two adjacent battery modules and cross-connected with the third side beam to divide the accommodating cavity into multiple areas. The number of the explosion-proof valves is multiple and corresponds one-to-one to the multiple areas.

[0013] According to some embodiments of the present utility model, the number of the second air inlet holes corresponds one-to-one to the number of the longitudinal beams, the second air inlet holes are arranged above the position where the longitudinal beam is connected to the third side beam, and the width of the second air inlet holes is greater than the thickness of the longitudinal beam.

[0014] According to some embodiments of the present invention, the battery pack further includes: a liquid cooling plate, the liquid cooling plate includes: a water inlet and a water outlet, the water inlet and the water outlet are arranged on a side of the fourth side beam away from the accommodating cavity.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the utility model;

[0017] Figure 2is a schematic diagram of a battery pack from another angle according to an embodiment of the utility model;

[0018] Figure 3 is a partial schematic diagram of a battery pack according to an embodiment of the utility model;

[0019] Figure 4 yes Figure 3 Schematic diagram from another angle;

[0020] Figure 5 is a partial schematic diagram of a battery pack according to an embodiment of the utility model from another angle;

[0021] Figure 6 yes Figure 5 Schematic diagram from another angle;

[0022] Figure 7 yes Figure 5 A schematic diagram from another angle;

[0023] Figure 8 yes Figure 5 A schematic diagram of the intermediate beam shown in ;

[0024] Fig. 9 This is a schematic diagram of the middle beam from another angle;

[0025] Fig.10 is a cross-sectional view of the middle beam;

[0026] Fig.11 This is a schematic diagram of the middle beam from another angle;

[0027] Fig.12 is along Fig.11 A cross-sectional view of the line AA shown in FIG.

[0028] Fig.13 is a schematic diagram of a liquid cooling plate.

[0029] Reference numerals:

[0030] 100. Battery pack;

[0031] 10. Battery module;

[0032] 20. Sampling element;

[0033] 30. frame; 31. first side beam; 311. first air inlet; 32. second side beam; 33. third side beam; 331. second air inlet; 34. fourth side beam;

[0034] 40. middle beam; 41. groove; 42. chamber; 43. reinforcement;

[0035] 50. Explosion-proof valve; 60. Front cross beam; 70. Fixed beam; 80. Longitudinal beam; 90. Liquid cooling plate; 91. Water inlet; 92. Water outlet. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] Reference below Figure 1-Figure 13 A battery pack 100 according to an embodiment of the present invention is described.

[0038] like Figure 1-Figure 5 As shown, the battery pack 100 according to the embodiment of the present invention includes: a plurality of battery modules 10 , a plurality of sampling elements 20 , a frame 30 and a middle beam 40 .

[0039] Specifically, multiple battery modules 10 are arranged at intervals along a first direction, and the battery module 10 includes multiple battery cells stacked along a second direction, and the first direction and the second direction are perpendicular to each other. Among them, the battery module 10 is the core component of the battery pack 100, which is mainly used to store and release energy.

[0040] Each battery module 10 is provided with a sampling element 20 on both sides in the first direction, and the sampling element 20 extends along the second direction. Specifically, the sampling element 20 is mainly used to collect important operating parameters of each battery cell inside the battery module 10, wherein the sampling element 20 can collect the temperature, voltage, etc. of the battery cell, and then transmit the data to the battery management system through the wiring harness for real-time detection, thereby ensuring the normal operation of each battery module 10, thereby ensuring that the battery system can work safely and efficiently.

[0041] The inner side of the frame 30 defines a receiving cavity, and a plurality of battery modules 10 are disposed in the receiving cavity. The receiving cavity provides a receiving space for the plurality of battery modules 10, and the frame 30 is mainly used to strengthen the strength of the battery pack 100, which can effectively reduce the risk of thermal runaway of the battery cells due to side collision.

[0042] The middle beam 40 is arranged in the accommodating cavity, the middle beam 40 extends along the first direction and is connected to the frame 30, and a plurality of grooves 41 are formed on the middle beam 40 and penetrate the middle beam 40 along the second direction, and the plurality of grooves 41 correspond to the plurality of sampling elements 20 one by one, and the sampling elements 20 are suitable for being embedded in the grooves 41, and the sampling elements 20 are cross-connected with the middle beam 40. The number and position of the plurality of grooves 41 correspond to the number and position of the plurality of sampling elements 20, for example, the number of the grooves 41 and the number of the sampling elements 20 can be two, four or more, respectively.

[0043] Specifically, the middle beam 40 extends along the first direction and is connected to the frame 30, and can divide the accommodating cavity into two parts arranged at intervals along the second direction. At the same time, the battery module 10 includes a plurality of battery cells stacked and arranged along the second direction, so that the middle beam 40 also divides each battery module 10 into two parts. In the prior art, when collecting signals from each battery module 10, due to the obstruction of the middle beam 40, it is necessary to collect the signals of the two parts of each battery module 10 separately, so it is necessary to arrange more sampling elements 20 and matching wiring harnesses, plug-ins and other components.

[0044] In this embodiment, by forming a groove 41 on the middle beam 40, the sampling element 20 can pass through the middle beam 40 to collect the signal of the entire battery module 10, thereby reducing the number of arranged sampling elements 20, and further reducing the use of components such as wiring harnesses and plug-ins of the collection elements. Therefore, more battery cells can be arranged in an effective space, thereby improving the volume utilization and the energy density of the battery pack 100.

[0045] For example Figure 4 and Figure 5As shown, there are two battery modules 10, which are arranged at intervals along the left-right direction; the sampling element 20 extends along the front-to-back direction and is fixedly connected to a plurality of battery cells, and is used to collect parameters such as temperature and voltage of the battery cells. The sampling element 20 includes four, wherein two sampling elements 20 are arranged between the two battery modules 10, and the other two are arranged in the gap between the battery module 10 and the side wall of the frame 30; the middle beam 40 extends along the left-to-right direction and is fixedly connected to the two side walls of the frame 30 in the left-to-right direction, and divides the accommodating cavity into two spaces in front and back. The groove 41 passes through the middle beam 40 in the front-to-back direction. The number of grooves 41 is four, which respectively correspond to the positions of the sampling element. Therefore, when assembling the battery pack 100, the sampling element 20 can cross the middle beam 40 through the groove 41 to complete the collection of the signal of the battery module 10. In this way, the number of arranged sampling elements 20 can be reduced, and then the use of components such as wiring harnesses and plug-ins of the collection element can be reduced. Therefore, more battery cells can be arranged in the effective space, thereby improving the volume utilization rate and the energy density of the battery pack 100.

[0046] According to the battery pack 100 of the present invention, by forming a groove 41 on the middle beam 40, the number of arranged sampling elements 20 can be reduced, and the use of components such as wiring harnesses and plug-ins of the sampling elements can be reduced. Therefore, more battery cells can be arranged in an effective space, thereby improving the volume utilization and the energy density of the battery pack 100.

[0047] According to some embodiments of the present invention, Figure 8-Figure 10 As shown, the groove 41 is formed in a U shape and passes through the upper end of the middle beam 40. In this way, the manufacturing difficulty and manufacturing cost of the middle beam 40 can be reduced, thereby increasing the manufacturing rate of the middle beam 40, and at the same time, it is also beneficial to assemble the sampling element 20 and the middle beam 40, thereby increasing the assembly rate of the battery cell.

[0048] According to some embodiments of the present invention, Fig.12 As shown, the middle beam 40 has a plurality of four chambers 42 spaced apart in the vertical direction, and the two middle chambers 42 are both provided with reinforcements 43. The middle beam 40 is formed with chambers 42, which can reduce the overall weight of the middle beam 40, thereby improving the lightweight of the battery pack 100; the reinforcements 43 are arranged in the two middle chambers 42, which can increase the strength of the middle beam 40, thereby improving the supporting capacity of the battery pack 100, thereby improving the ability of the battery pack 100 to resist external collisions.

[0049] Optionally, the reinforcement member 43 may be block-shaped, and the cross-sectional area and cross-sectional shape of the reinforcement member 43 are substantially the same as the cross-sectional area and cross-sectional shape of the corresponding cavity 42. In addition, there are multiple ways to connect the reinforcement member 43 and the cavity 42. For example, the reinforcement member 43 may be fixed in the cavity 42 of the middle beam 40 by welding, bonding or riveting.

[0050] Optionally, the middle beam 40 may be made of a variety of materials, for example, aluminum profiles or steel; the middle beam 40 may be formed by a variety of processes, for example, by extrusion forming, by roll forming, etc.

[0051] Furthermore, the reinforcements 43 are disposed at both ends of the two middle chambers 42 , so that the structural strength of the middle beam 40 can be increased while the overall weight of the middle beam 40 can be reduced, thereby achieving lightweighting of the battery pack 100 .

[0052] According to some embodiments of the present invention, Figure 5 and Figure 6 As shown, the battery pack 100 also includes: an explosion-proof valve 50, which is connected to the frame 30. The explosion-proof valve 50 is mainly used to release internal gas in time to reduce the internal pressure of the battery pack 100 when the battery pack 100 has thermal runaway and the internal pressure rises sharply, thereby reducing the occurrence of explosion of the battery pack 100 due to excessive internal pressure.

[0053] The frame 30 includes: a first side beam 31 and a second side beam 32 arranged at intervals along a first direction, a middle beam 40 connected between the first side beam 31 and the second side beam 32, a plurality of first air inlet holes 311 and a first exhaust channel are formed on the first side beam 31 and the second side beam 32, and the plurality of first air inlet holes 311 are connected to the explosion-proof valve 50 through the first exhaust channel. Specifically, when a battery cell undergoes thermal runaway, the high-temperature gas ejected from the battery cell can enter the first exhaust channel through the first air inlet holes 311, and then flow through the first exhaust channel to the explosion-proof valve 50 for discharge, thereby reducing the internal pressure of the battery pack 100. Among them, since the middle beam 40 is connected to the first side beam 31 and the second side beam 32, the middle beam 40 will divide the accommodating cavity into two parts, front and rear. Therefore, the first air inlet 311 and the first exhaust channel are set on the first side beam 31 and the second side beam 32. When thermal runaway occurs in the battery cell at any position in the accommodating cavity, the explosion-proof valve 50 can discharge the high-pressure gas, thereby reducing the occurrence of explosion of the battery pack 100 due to excessive internal pressure.

[0054] According to some embodiments of the utility model, a fireproof and heat-insulating layer is provided on one side surface of the first side beam 31 and the second side beam 32 that are arranged opposite to each other. The fireproof and heat-insulating layer can insulate the high-temperature and high-pressure gas entering the first exhaust channel, thereby preventing the first side beam 31 and the second side beam 32 from heating up and causing thermal runaway of the battery cells at adjacent positions, thereby reducing the aggravation of thermal runaway inside the battery pack 100.

[0055] Optionally, the fireproof and heat-insulating layer may be made of multiple materials, for example, ceramic silicone rubber, mica paper, ceramic glass fiber cloth, basalt ceramic cloth, etc.

[0056] According to some embodiments of the present invention, Figure 5 and Figure 6 As shown, the frame 30 includes: a third side beam 33 and a fourth side beam 34 arranged at intervals along the second direction, the third side beam 33 extends along the first direction and is connected to the rear ends of the first side beam 31 and the second side beam 32, the fourth side beam 34 extends along the first direction and is connected to the front ends of the first side beam 31 and the second side beam 32, and the explosion-proof valve 50 is arranged on the third side beam 33. Specifically, the battery pack 100 also includes a front cross beam 60, which is arranged on the side of the middle beam 40 facing the fourth side beam 34, and a space for arranging electrical components is constructed between the front cross beam 60 and the fourth side beam 34, and the electrical components of the battery pack 100 are arranged in this space. Therefore, the explosion-proof valve 50 is arranged on the third side beam 33, so that the explosion-proof valve 50 will not damage the electrical components of the battery pack 100 when working, thereby reducing the maintenance cost of the battery pack 100.

[0057] Furthermore, for example Figure 7 As shown, the battery pack 100 further includes a fixed beam 70, which is arranged between the front cross beam 60 and the fourth side beam 34 and is used for fixing and installing a BDU (Battery Disconnect Unit) and a BMS (Battery Management System).

[0058] According to some embodiments of the present invention, Figure 5 and Figure 6 As shown, a second air inlet 331 and a second exhaust channel are formed on the third side beam 33, and the second air inlet 331 is connected to the explosion-proof valve 50 through the second exhaust channel. In this way, when thermal runaway occurs in the battery cell, exhaust can be performed from multiple directions, thereby increasing the exhaust rate, thereby further improving the safety of the battery pack 100.

[0059] According to some embodiments of the present invention, Figure 5 and Figure 6As shown, the battery pack 100 further includes: at least one longitudinal beam 80, which is arranged between two adjacent battery modules 10 and cross-connected with the third side beam 33 to divide the accommodating cavity into multiple areas. The number of longitudinal beams can be one or more, and the specific number can be designed according to actual conditions. Specifically, the longitudinal beam 80 can increase the overall strength of the battery pack 100. At the same time, the longitudinal beam can divide the accommodating cavity into multiple separate spaces. Therefore, when thermal runaway occurs in a certain area, the longitudinal beam 80 can also control the thermal runaway in this area, thereby preventing the spread of thermal runaway.

[0060] There are multiple explosion-proof valves 50, and the multiple explosion-proof valves 50 correspond one-to-one to the multiple areas. In this way, when the internal pressure of the battery module 10 in the corresponding area is too high, the corresponding explosion-proof valve 50 will be activated to release the internal pressure to prevent the battery pack 100 from exploding or rupturing due to excessive internal pressure, thereby enhancing the safety of the battery pack 100.

[0061] Furthermore, the longitudinal beam 80 is arranged at the lower side of the middle beam 40 and is vertically connected to the middle beam 40 . The collection unit is arranged on a side of the middle beam 40 away from the longitudinal beam 80 and is engaged and connected to the middle beam 40 through the groove 41 .

[0062] According to some embodiments of the present invention, Figure 5 and Figure 6 As shown, the number of the second air inlet holes 331 corresponds to the number of the longitudinal beams 80, and the second air inlet holes 331 are arranged above the position where the longitudinal beam 80 is connected to the third side beam 33, and the width of the second air inlet holes 331 is greater than the thickness of the longitudinal beam 80. In this way, the number of the second air inlet holes 331 can be reduced while ensuring the smoothness of exhaust, thereby reducing the difficulty of manufacturing the frame 30.

[0063] According to some embodiments of the present invention, Fig.13 As shown, the battery pack 100 further includes: a liquid cooling plate 90 , wherein the liquid cooling plate 90 is mainly used for heat exchange with the plurality of battery modules 10 , thereby ensuring the safety of the battery pack 100 during operation.

[0064] The liquid cooling plate 90 includes: a water inlet 91 and a water outlet 92, and the water inlet 91 and the water outlet 92 are arranged on the side of the fourth side beam 34 away from the accommodating cavity. Among them, the water inlet 91 and the water outlet 92 are mainly used for external water pipes, and the water inlet 91 and the water outlet 92 are arranged on the side of the fourth side beam 34 away from the accommodating cavity. It can be understood that the water inlet 91 and the water outlet 92 are arranged on the outside of the battery pack 100, so that the battery pack 100 does not need to be equipped with liquid inlet and liquid outlet pipelines, thereby reducing the space occupied by the liquid cooling plate 90, thereby improving the integration degree of the battery pack 100, improving the volume utilization rate of the battery pack 100, thereby increasing the power of the battery pack 100, and improving the energy density of the battery pack 100; at the same time, it can also avoid the risk of cooling liquid leakage, thereby improving the safety of the battery pack 100.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A plurality of battery modules, wherein the plurality of battery modules are arranged at intervals along a first direction, and the battery module comprises a plurality of battery cells stacked and arranged along a second direction, wherein the first direction and the second direction are perpendicular to each other; A plurality of sampling elements, each battery module is respectively provided with one sampling element on both sides in the first direction, and the sampling elements extend along the second direction; A frame, wherein an inner side of the frame defines a receiving cavity, and a plurality of the battery modules are arranged in the receiving cavity; A middle beam, wherein the middle beam is arranged in the accommodating cavity, the middle beam extends along the first direction and is connected to the frame, a plurality of grooves are formed on the middle beam and penetrate the middle beam along the second direction, the plurality of grooves correspond to the plurality of sampling elements one by one, and the sampling elements are suitable for being embedded in the grooves, and the sampling elements are cross-connected with the middle beam.

2. The battery pack according to claim 1, characterized in that: The groove is formed in a U shape and passes through the upper end of the middle beam.

3. The battery pack according to claim 1, characterized in that: The middle beam has four chambers spaced apart in the up-down direction, and reinforcement members are arranged in the two middle chambers.

4. The battery pack according to any one of claims 1 to 3, characterized in that: Also includes: an explosion-proof valve, the explosion-proof valve being connected to the frame, The frame includes: a first side beam and a second side beam arranged at intervals along the first direction, the middle beam is connected between the first side beam and the second side beam, and a plurality of first air inlet holes and a first exhaust channel are formed on the first side beam and the second side beam, and the plurality of first air inlet holes are connected to the explosion-proof valve through the first exhaust channel.

5. The battery pack according to claim 4, characterized in that: A fireproof and heat-insulating layer is provided on one side surface of the first side beam and the second side beam which are arranged opposite to each other.

6. The battery pack according to claim 4, characterized in that: The frame includes: a third side beam and a fourth side beam arranged at intervals along the second direction, the third side beam extends along the first direction and is connected to the rear ends of the first side beam and the second side beam, the fourth side beam extends along the first direction and is connected to the front ends of the first side beam and the second side beam, and the explosion-proof valve is arranged on the third side beam.

7. The battery pack according to claim 6, characterized in that: A second air inlet hole and a second exhaust channel are formed on the third side beam, and the second air inlet hole is connected to the explosion-proof valve through the second exhaust channel.

8. The battery pack according to claim 7, characterized in that: Also includes: At least one longitudinal beam is arranged between two adjacent battery modules and cross-connected with the third side beam to divide the accommodating cavity into multiple areas. There are multiple explosion-proof valves, which correspond one to one to the multiple areas.

9. The battery pack according to claim 8, characterized in that: The number of the second air inlet holes corresponds to the number of the longitudinal beams. The second air inlet holes are arranged above the position where the longitudinal beam is connected to the third side beam, and the width of the second air inlet holes is greater than the thickness of the longitudinal beam.

10. The battery pack according to claim 6, characterized in that: Also includes: A liquid cooling plate, the liquid cooling plate comprising: a water inlet and a water outlet, the water inlet and the water outlet being arranged on a side of the fourth side beam away from the accommodating cavity.

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