Battery box and power battery

Abstract

The battery box comprises a box body and a liquid cooling plate, the box body is provided with an anti-explosion valve, the liquid cooling plate is arranged in the box body and located above a bottom plate, the side face, away from the bottom plate, of the liquid cooling plate is used for bearing a battery module, the liquid cooling plate is provided with a liquid cooling flow channel and a pressure relief channel which are arranged at intervals, and the pressure relief channel is communicated with the liquid cooling flow channel. The pressure relief channel is communicated with the anti-explosion valve, a second pressure relief opening is formed in the position, corresponding to the pressure relief channel, of the liquid cooling plate, the second pressure relief opening is in sealed communication with the first pressure relief opening of the battery module, and high-temperature gas generated during thermal runaway of the battery module can be quickly discharged out of the battery box sequentially through the first pressure relief opening, the second pressure relief opening, the pressure relief channel and the anti-explosion valve. According to the utility model, the pressure relief channel is integrated on the liquid cooling plate, so that pressure relief protection does not need to be carried out through the bottom plate, the condition of pressure relief protection failure caused by collision and damage of the bottom plate can be avoided, and when the bottom plate is damaged, the liquid cooling plate can be used for sealing and protecting the battery module so as to prevent the battery module from being exposed, and the safety performance is high.

Description

Technical Field

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

[0002] The existing power battery mainly includes a battery box, a battery module installed in the battery box, and a liquid cooling module for cooling the battery module. In the related art, a tray for installing the battery module is provided in the battery box, and the tray is spaced apart from the bottom plate of the battery box and a pressure relief channel is formed. The pressure relief channel is connected to the pressure relief port of the battery module. The pressure relief channel is used to quickly guide the flame and combustible gas out when the battery module has thermal runaway, so as to play a role of pressure relief protection.

[0003] However, since the bottom plate and tray are usually made of thin plates with poor strength, the bottom plate is prone to bumps and damage during the use of the power battery (for example, when the vehicle is driving), causing the pressure relief channel to fail and affecting the pressure relief effect. In addition, the battery module will also be at risk of direct exposure, resulting in poor safety performance. Utility Model Content

[0004] One purpose of an embodiment of the utility model is to provide a battery box that can improve the stability of pressure relief protection during thermal runaway, while reducing the risk of direct exposure of battery modules and having high safety performance.

[0005] Another purpose of the embodiments of the present utility model is to provide a power battery with good safety performance and stable and reliable performance.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, a battery box is provided, comprising:

[0008] A box body, wherein the box body is provided with an explosion-proof valve and a bottom plate;

[0009] A liquid cooling plate, wherein the liquid cooling plate is arranged in the box body and is located above the bottom plate, the side of the liquid cooling plate facing away from the bottom plate is used to support the battery module, the liquid cooling plate is provided with spaced liquid cooling channels and pressure relief channels, the pressure relief channel is connected to the explosion-proof valve, and the liquid cooling plate is provided with a second pressure relief port at a position corresponding to the pressure relief channel.

[0010] As a preferred solution for the battery box, the liquid cooling plate is provided with a plurality of the second pressure relief ports, and a sealing structure is provided on the side of the liquid cooling plate facing away from the bottom plate, and the sealing structure is used to fill between the liquid cooling plate and the battery module, and the sealing structure is provided with a plurality of first connecting channels corresponding to the positions of the second pressure relief ports, and the first connecting channels are respectively used to connect the corresponding first pressure relief ports and the second pressure relief ports.

[0011] As a preferred solution for the battery box, the sealing structure includes a thermally conductive adhesive and a first adhesive stopper, the thermally conductive adhesive is used to bond the liquid cooling plate and the battery module, the thermally conductive adhesive is provided with the first connecting channel, and the first adhesive stopper is arranged in the first connecting channel and surrounds the outer periphery of the corresponding second pressure relief port.

[0012] As a preferred solution for the battery box, a plurality of the thermally conductive adhesives are arranged at intervals on the liquid cooling plate, and the sealing structure also includes a plurality of second adhesive blocking parts, and the second adhesive blocking parts are arranged between two adjacent thermally conductive adhesives and between the side wall of the battery box and the thermally conductive adhesive.

[0013] As a preferred solution for the battery box, a protective isolation piece for sealing the second pressure relief port is further provided in the box.

[0014] As a preferred solution for the battery box, a first reinforcing beam is provided in the battery box, a second connecting channel connected to the explosion-proof valve is provided inside the first reinforcing beam, a third pressure relief port connected to the second connecting channel is provided on the first reinforcing beam, a fourth pressure relief port is provided at a position of the liquid cooling plate corresponding to the third pressure relief port, and the fourth pressure relief port is connected to the pressure relief channel.

[0015] As a preferred solution for the battery box, the liquid cooling plate includes a first plate and a second plate arranged above the first plate, the first plate is recessed on the side of the second plate and is provided with multiple liquid cooling grooves and multiple pressure relief grooves, the contact surface between the first plate and the second plate is sealed, the second plate is sealed in the notch of the liquid cooling groove and forms a closed liquid cooling flow channel, the second plate is sealed in the notch of the pressure relief groove and forms a closed pressure relief channel, and the second plate is provided with the second pressure relief port and the fourth pressure relief port corresponding to the pressure relief groove.

[0016] As a preferred solution of the battery box, a first heat insulating member is further provided in the battery box, and the first heat insulating member is provided between the bottom plate and the liquid cooling plate.

[0017] As a preferred solution for the battery box, a second reinforcing beam and a third reinforcing beam are alternately arranged in the battery box, and the second reinforcing beam and the third reinforcing beam divide the interior of the battery box into a plurality of installation cavities, and each installation cavity is used to install one of the battery modules.

[0018] In a second aspect, a power battery is provided, comprising a battery module and the battery box described above, wherein the battery module is installed on the side of the liquid cooling plate in the battery box away from the bottom plate, and the battery module is provided with a first pressure relief port, which is arranged corresponding to the second pressure relief port of the liquid cooling plate.

[0019] The beneficial effects of the utility model are as follows: the bottom of the battery module is supported by the liquid cooling plate, and the pressure relief channel and the second pressure relief port are integrated on the liquid cooling plate. On the one hand, the liquid cooling plate is used to realize the pressure relief protection function, and there is no need to use the bottom plate for pressure relief protection, which can avoid the situation where the bottom plate of the battery box is damaged by collision during use and the pressure relief protection fails. On the other hand, the bottom plate can play a role of primary sealing protection for the battery module, and when the bottom plate is damaged by collision, the liquid cooling plate can also play a role of secondary sealing protection for the battery module, thereby avoiding direct exposure of the battery module, ensuring the sealing of the battery module, and thus improving the safety performance of the battery box;

[0020] In addition, the liquid cooling plate can also replace the battery tray structure to play a supporting and protective role. Compared with the prior art, the battery box of the utility model can also reduce the battery tray structure and has a higher degree of integration, which is conducive to reducing the overall weight of the battery box and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described in detail below based on the drawings and embodiments.

[0022] Figure 1 This is a first assembly exploded view of the power battery described in an embodiment of the utility model.

[0023] Figure 2 This is a second assembly exploded view of the power battery described in an embodiment of the utility model.

[0024] Figure 3 for Figure 1 Enlarged view of point A.

[0025] Figure 4 It is a cross-sectional view of the power battery described in an embodiment of the utility model.

[0026] Figure 5 for Figure 4 Enlarged view of point B.

[0027] Figure 6 This is a three-dimensional view of the first reinforcing beam in an embodiment of the utility model.

[0028] Figure 7 This is an assembly exploded view of the battery module described in an embodiment of the utility model.

[0029] In the figure:

[0030] 1. Box body; 11. Explosion-proof valve; 12. Bottom plate; 13. First reinforcing beam; 131. Second connecting channel; 132. Third pressure relief port; 133. Fifth pressure relief port; 14. Second reinforcing beam; 15. Third reinforcing beam; 16. Installation cavity; 17. Enclosure; 2. Battery module; 21. Cell group; 211. Single battery; 2111. First pressure relief port; 212. Second insulating and heat-insulating member; 22. Second insulating and heat-insulating member; 23. End plate; 24. Second heat-insulating member; 3. Liquid cooling plate; 31. Liquid cooling channel; 32. Pressure relief channel; 33. Second pressure relief port; 34. Fourth pressure relief port; 35. First plate; 36. Second plate; 4. Sealing structure; 41. First connecting channel; 42. Thermal conductive adhesive; 43. First adhesive stopper; 44. Second adhesive stopper; 5. Protective isolation member; 6. First heat-insulating member. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 or an electrical connection; 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.

[0033] like Figures 1 to 5As shown, the utility model provides a battery box and a power battery, wherein the power battery comprises the battery box of the utility model and a battery module 2 installed in the battery box. Specifically, the battery box comprises a box body 1 and a liquid cooling plate 3 arranged in the box body 1, the box body 1 comprises a bottom plate 12 and a surrounding plate 17, the liquid cooling plate 3 is arranged in the box body 1 and is located above the bottom plate 12, and the side of the liquid cooling plate 3 away from the bottom plate 12 is used to support the battery module 2. Among them, an explosion-proof valve 11 is arranged on the surrounding plate 17, a first pressure relief port 2111 is arranged at the bottom of the battery module 2, the liquid cooling plate 3 is provided with an isolated liquid cooling channel 31 and a pressure relief channel 32, the pressure relief channel 32 is connected with the explosion-proof valve 11, and a second pressure relief port 33 is arranged at a position corresponding to the pressure relief channel 32 of the liquid cooling plate 3, and the second pressure relief port 33 is arranged corresponding to the first pressure relief port 2111 of the battery module 2, so that the second pressure relief port 33 is connected with the first pressure relief port 2111. The high-temperature gas and other ejecta generated when the battery module 2 thermally runs away can be quickly discharged to the outside of the box body 1 through the first pressure relief port 2111, the second pressure relief port 33, the pressure relief channel 32, and the explosion-proof valve 11 in sequence for pressure relief, thereby ensuring the safety performance of the battery box.

[0034] This design supports the bottom of the battery module 2 through the liquid cooling plate 3, and integrates the pressure relief channel 32 and the second pressure relief port 33 on the liquid cooling plate 3. On the one hand, the liquid cooling plate 3 can be used to achieve the pressure relief protection function, so that there is no need to use the bottom plate 12 for pressure relief protection, thereby avoiding the situation where the bottom plate 12 is damaged by bumps during use of the battery box and causing the pressure relief protection to fail. On the other hand, the bottom plate 12 can provide a primary sealing protection for the battery module 2, and when the bottom plate 12 is damaged by bumps, the liquid cooling plate 3 can also provide a secondary sealing protection for the battery module 2, thereby avoiding direct exposure of the battery module 2, ensuring the sealing of the battery module 2, and thus improving the safety performance of the battery box.

[0035] In addition, the liquid cooling plate 3 can also replace the battery tray structure to support the battery module 2. Compared with the prior art, the battery box of the utility model can also reduce the battery tray structure and has a higher degree of integration, which is beneficial to reducing the overall weight of the battery box and reducing costs.

[0036] Further, refer to Figures 1 to 6A first reinforcing beam 13 is provided in the box body 1, and the first reinforcing beam 13 divides the inside of the box body 1 into a first cavity for installing the battery module 2 and a second cavity for installing electrical components such as the battery management system. Among them, a second connecting channel 131 connected to the explosion-proof valve 11 is provided inside the first reinforcing beam 13. For example, the side walls of the first reinforcing beam 13 are respectively provided with a third pressure relief port 132 and a fifth pressure relief port 133. The explosion-proof valve 11 is provided on the side wall of the box body 1. The fifth pressure relief port 133 is connected to the explosion-proof valve 11 through a connecting pipe. The liquid cooling plate 3 is provided with a fourth pressure relief port 34 at a position corresponding to the third pressure relief port 132, and the fourth pressure relief port 34 is connected to the pressure relief channel 32. The jet generated by thermal runaway can be discharged to the outside of the box body 1 through the first pressure relief port 2111, the second pressure relief port 33, the pressure relief channel 32, the third pressure relief port 132, the fourth pressure relief port 34, the second connecting channel 131, the fifth pressure relief port 133, the connecting pipe, and the explosion-proof valve 11 in sequence, thereby eliminating the need to use the bottom plate 12 to achieve pressure relief protection for the battery module 2.

[0037] In an optional embodiment, the liquid cooling plate 3 includes a first plate 35 and a second plate 36 arranged above the first plate 35, and the first plate 35 is recessed on the side of the second plate 36 to be provided with a plurality of liquid cooling grooves and a plurality of pressure relief grooves, and the contact surface between the first plate 35 and the second plate 36 is sealed. Exemplarily, the first plate 35 and the second plate 36 can achieve contact surface sealing through a brazing process, so that the second plate 36 is sealed in the notch of the liquid cooling groove and forms a closed liquid cooling channel 31, and at the same time, the second plate 36 is sealed in the notch of the pressure relief groove and forms a closed pressure relief channel 32, and the second plate 36 is provided with a second pressure relief port 33 and a fourth pressure relief port 34 corresponding to the pressure relief groove.

[0038] In another optional embodiment, the liquid cooling plate 3 includes a first plate 35 and a second plate 36 arranged above the first plate 35, the contact surface between the first plate 35 and the second plate 36 is sealed, and the opposite sides of the first plate 35 and the second plate 36 are recessed with multiple liquid cooling grooves and multiple pressure relief grooves, the liquid cooling grooves of the first plate 35 correspond one-to-one with the liquid cooling grooves of the second plate 36 and form a liquid cooling flow channel 31, the pressure relief grooves of the first plate 35 correspond one-to-one with the pressure relief grooves of the second plate 36 and form a pressure relief channel 32, and the second plate 36 is provided with a second pressure relief port 33 and a fourth pressure relief port 34 corresponding to the pressure relief grooves, thereby forming a liquid cooling plate 3.

[0039] Of course, in other optional embodiments, the liquid cooling plate 3 includes a first plate 35 and a second plate 36 arranged above the first plate 35, the contact surface between the first plate 35 and the second plate 36 is sealed, and the second plate 36 is recessed toward the side of the first plate 35 and is provided with multiple liquid cooling grooves and multiple pressure relief grooves. The first plate 35 is sealed in the notch of the liquid cooling groove to form a closed liquid cooling flow channel 31. At the same time, the first plate 35 is sealed in the notch of the pressure relief groove to form a closed pressure relief channel 32, and the second plate 36 is provided with a second pressure relief port 33 and a fourth pressure relief port 34 corresponding to the pressure relief groove.

[0040] Specifically, refer to Figure 2 A first heat insulating member 6 is also provided in the box body 1. The first heat insulating member 6 can be a heat preservation cotton. The first heat insulating member 6 is provided between the bottom plate 12 and the liquid cooling plate 3. The first heat insulating member 6 can prevent the heat outside the box body 1 from being transferred to the liquid cooling plate 3, so as to avoid reducing the cooling effect of the liquid cooling plate 3.

[0041] In this embodiment, if Figures 1 to 4 As shown, a plurality of battery modules 2 are arranged in the box body 1, each battery module 2 is provided with a first pressure relief port 2111, and the liquid cooling plate 3 is provided with a plurality of second pressure relief ports 33, and the first pressure relief ports 2111 correspond to the second pressure relief ports 33 one by one.

[0042] Among them, a sealing structure 4 is arranged on the side of the liquid cooling plate 3 facing away from the base plate 12, and the sealing structure 4 is filled between the battery module 2 and the liquid cooling plate 3. The sealing structure 4 is provided with a first connecting channel 41 at the position corresponding to the first pressure relief port 2111 and the second pressure relief port 33, and the first connecting channel 41 respectively connects the corresponding first pressure relief port 2111 and the second pressure relief port 33. It is understandable that when one of the battery modules 2 or the battery module 2 experiences thermal runaway, the ejecta generated therefrom may spread from the gap between the battery module 2 and the liquid cooling plate 3 to other normal battery modules 2, causing thermal runaway in other battery modules 2 and causing the thermal runaway to spread. The sealing structure 4 can seal the gaps between all battery modules 2 and the liquid cooling plate 3, and connect the corresponding first pressure relief port 2111 and the second pressure relief port 33 through the connecting channel, ensuring that the ejecta generated by the thermal runaway can only enter the pressure relief channel 32 along the first pressure relief port 2111, the first connecting channel 41, and the second pressure relief port 33 and be discharged from the explosion-proof valve 11, thereby preventing the ejecta from spreading and causing the thermal runaway to spread.

[0043] Furthermore, the sealing structure 4 includes a thermally conductive adhesive 42, which is used to bond the liquid cooling plate 3 and the battery module 2, and the thermally conductive adhesive 42 is provided with a first connecting channel 41. On the one hand, the thermally conductive adhesive 42 can bond the battery module 2 to the liquid cooling plate 3, so that the battery module 2 is firmly fixed in the box 1, and at the same time, the thermally conductive adhesive 42 is filled between the battery module 2 and the liquid cooling plate 3, and can also play a role in sealing the gap between the battery module 2 and the liquid cooling plate 3. On the other hand, the thermally conductive adhesive 42 can also play a role in heat transfer, and quickly transfer the heat generated by the battery module 2 when in use to the liquid cooling plate 3 for rapid heat dissipation.

[0044] When the thermal conductive adhesive 42 is poured, the thermal conductive adhesive 42 easily flows from the second pressure relief port 33 into the pressure relief channel 32, thereby blocking the pressure relief channel 32. Based on this, further, the sealing structure 4 also includes a first adhesive stopper 43. Optionally, the first adhesive stopper 43 can be a foam. The first adhesive stopper 43 is arranged in the first connecting channel 41 and surrounds the outer periphery of the second pressure relief port 33. It can be understood that before pouring the thermal conductive adhesive 42, the first adhesive stopper 43 can be filled between the battery module 2 and the liquid cooling plate 3 and located at the outer periphery of the second pressure relief port 33 to seal and block the thermal conductive adhesive 42 from flowing into the second pressure relief port 33, and also enable the thermal conductive adhesive 42 to form a first connecting channel 41 corresponding to the positions of the first pressure relief port 2111 and the second pressure relief port 33 during solidification.

[0045] Alternatively, if Figure 1 and Figure 2 As shown, the box body 1 is also staggered with a second reinforcing beam 14 and a third reinforcing beam 15, which divide the first cavity inside the box body 1 into a plurality of mounting cavities 16, and each mounting cavity 16 is provided with a battery module 2. The second reinforcing beam 14 and the third reinforcing beam 15 can enhance the strength of the box body 1, and can also insulate and separate the battery modules 2 to prevent the battery modules 2 from short-circuiting.

[0046] Preferably, each battery module 2 is provided with a heat-conducting adhesive 42, that is, a heat-conducting adhesive 42 is provided between the bottom of each mounting cavity 16 and the battery module 2. Figures 1 to 7 , exemplarily, each battery module 2 is provided with a plurality of battery cell groups 21 arranged side by side along a first direction (x direction in the figure), and each battery cell group 21 includes a plurality of single cells 211 arranged side by side along a second direction (y direction in the figure), and the first direction and the second direction are arranged at an angle, and in this embodiment, the first direction and the second direction are perpendicular. Among them, a plurality of thermal conductive adhesives 42 are arranged at intervals on the liquid cooling plate 3, that is, a thermal conductive adhesive 42 is arranged at a position corresponding to each battery cell group 21 of the liquid cooling plate 3, and the sealing structure 4 also includes a plurality of second adhesive blocking parts 44, which can be insulating adhesive blocking strips, and a second adhesive blocking part 44 is arranged between two adjacent thermal conductive adhesives 42 and between the side wall (i.e., the enclosure 17) of the battery box and the thermal conductive adhesive 42. This design can not only block the thermal conductive adhesive 42 by the adhesive blocking strip to prevent the thermal conductive adhesive 42 from flowing around, but also can accurately control the thickness of the thermal conductive adhesive 42 by the adhesive blocking strip to ensure the adhesion effect and heat transfer effect of the thermal conductive adhesive 42.

[0047] Specifically, a protective isolating member 5 for blocking the second pressure relief port 33 is also provided in the box body 1, and the protective isolating member 5 may be a mica sheet. It is understandable that when thermal runaway occurs in one of the single cells 211, the jet ejected at high speed can break through the protective isolating member 5 at the corresponding second pressure relief port 33 and enter the pressure relief channel 32, while the other second pressure relief ports 33 connected to the pressure relief channel 32 can be blocked by the protective isolating member 5 to prevent the jet from flowing from the other second pressure relief ports 33 to the normal single cells 211 through the pressure relief channel 32, thereby avoiding causing thermal runaway of the other normal single cells 211.

[0048] In this embodiment, if Figure 7 As shown, a second insulating heat insulating member 22 is provided between two adjacent battery cell groups 21 in each battery module 2. The second insulating heat insulating member 22 may be a foam or plastic insulating sheet, and the second insulating heat insulating member 22 can insulate and isolate two adjacent battery cell groups 21 to prevent a short circuit between the two adjacent battery cell groups 21, thereby ensuring the installation and operation of the battery module 2, and can also provide heat insulation and buffer protection for the battery cell groups 21.

[0049] Furthermore, a second insulating and heat-insulating member 212 is provided between two adjacent single cells 211 in each battery cell group 21, and the second insulating and heat-insulating member 212 may be a foam buffer plate. The second insulating and heat-insulating member 212 can insulate and isolate two adjacent single cells 211 to prevent short circuit between the two adjacent single cells 211, further improving the safety and reliability of the battery module 2, and can also provide heat insulation and buffer protection for the battery cell group 21.

[0050] Specifically, both ends of the battery cell group 21 along the second direction are provided with insulating end plates 23, and each end plate 23 simultaneously connects the end surfaces of all the battery cell groups 21 on the same side, so that all the battery cell groups 21 are connected to form the entire battery module 2. Furthermore, a second heat insulating member 24 is provided between the end plate 23 and the battery cell group 21, and the second heat insulating member 24 can isolate the external heat from transferring to the battery cell group 21, so as to prevent the external heat from affecting the performance of the battery module 2.

[0051] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0052] In the description of this specification, the description with reference to the terms "an embodiment", "example", 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 representation of the above terms does not necessarily refer to the same embodiment or example.

[0053] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0054] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A battery box, characterized in that: include: A box body, wherein the box body is provided with an explosion-proof valve and a bottom plate; A liquid cooling plate, wherein the liquid cooling plate is arranged in the box body and is located above the bottom plate, the side of the liquid cooling plate facing away from the bottom plate is used to support the battery module, the liquid cooling plate is provided with spaced liquid cooling channels and pressure relief channels, the pressure relief channel is connected to the explosion-proof valve, and the liquid cooling plate is provided with a second pressure relief port at a position corresponding to the pressure relief channel.

2. The battery box according to claim 1, characterized in that: The liquid cooling plate is provided with a plurality of the second pressure relief ports, and a sealing structure is provided on the side of the liquid cooling plate facing away from the bottom plate, the sealing structure is used to be filled between the liquid cooling plate and the battery module, and the sealing structure is provided with a plurality of first connecting channels at positions corresponding to the second pressure relief ports, and the first connecting channels are respectively used to connect the corresponding first pressure relief ports and the second pressure relief ports.

3. The battery box according to claim 2, characterized in that: The sealing structure includes a thermally conductive adhesive and a first adhesive stopper, the thermally conductive adhesive is used to bond the liquid cooling plate and the battery module, the thermally conductive adhesive is provided with the first connecting channel, and the first adhesive stopper is arranged in the first connecting channel and surrounds the outer periphery of the corresponding second pressure relief port.

4. The battery box according to claim 3, characterized in that: A plurality of the thermally conductive adhesives are arranged at intervals on the liquid cooling plate, and the sealing structure further comprises a plurality of second adhesive blocking members, wherein the second adhesive blocking members are arranged between two adjacent thermally conductive adhesives and between the side wall of the battery box and the thermally conductive adhesive.

5. The battery box according to claim 1, characterized in that: The box body is also provided with a protective isolation piece for blocking the second pressure relief port.

6. The battery box according to any one of claims 1 to 5, characterized in that: A first reinforcing beam is arranged in the battery box, a second connecting passage connected to the explosion-proof valve is arranged inside the first reinforcing beam, a third pressure relief port connected to the second connecting passage is arranged on the first reinforcing beam, a fourth pressure relief port is arranged at a position of the liquid cooling plate corresponding to the third pressure relief port, and the fourth pressure relief port is connected to the pressure relief passage.

7. The battery box according to claim 6, characterized in that: The liquid cooling plate includes a first plate and a second plate arranged above the first plate, the first plate is recessed on the side of the second plate and is provided with a plurality of liquid cooling grooves and a plurality of pressure relief grooves, the contact surface between the first plate and the second plate is sealed, the second plate is sealed in the notch of the liquid cooling groove and forms the closed liquid cooling flow channel, the second plate is sealed in the notch of the pressure relief groove and forms the closed pressure relief channel, and the second plate is provided with the second pressure relief port and the fourth pressure relief port corresponding to the pressure relief groove.

8. The battery box according to any one of claims 1 to 5, characterized in that: A first heat insulating member is also provided in the battery box, and the first heat insulating member is provided between the bottom plate and the liquid cooling plate.

9. The battery box according to any one of claims 1 to 5, characterized in that: The battery box is also staggered with a second reinforcing beam and a third reinforcing beam, and the second reinforcing beam and the third reinforcing beam divide the interior of the battery box into a plurality of installation cavities, and each installation cavity is used to install one of the battery modules.

10. A power battery, characterized in that: It comprises a battery module and a battery box according to any one of claims 1 to 9, wherein the battery module is installed on the side of a liquid cooling plate in the battery box away from a bottom plate, and the battery module is provided with a first pressure relief port, which is arranged corresponding to the second pressure relief port of the liquid cooling plate.

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