Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, and belongs to the technical field of batteries. In the battery pack, a flow channel and a first exhaust hole are formed in a liquid cooling plate, an exhaust channel communicated with the first exhaust hole is formed between the liquid cooling plate and a bottom plate, and a confluence channel connected with the exhaust channel is formed in a side plate; the exhaust function and the runner heat management function can be effectively integrated, on one hand, the improvement of the space utilization rate of the battery pack and the improvement of the volume energy density are facilitated, on the other hand, high-temperature gas is discharged out of the battery pack through the pressure relief device on the side plate, and the battery pack damage or other safety problems caused by too high pressure are prevented. In addition, the exhaust channel is arranged between the liquid cooling plate and the bottom plate, so that the influence of exhaust on the single battery during thermal runaway can be reduced. And moreover, the liquid cooling plate can also play a role in anti-collision sealing, and when the battery pack bottom plate is scraped or impacted, the liquid cooling plate can still play a role in sealing above the bottom plate, so that the problems of short circuit and the like caused by entering of external water vapor are reduced.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] With the development and popularization of new energy vehicles, the safety requirements for battery packs are getting higher and higher. Common battery packs with the explosion-proof valve of the single cell facing downwards usually only have a single layer of seal at the bottom. When the bottom is scraped or ball-impacted, the seal is easily damaged, resulting in poor airtightness of the battery pack and a short circuit. Utility Model Content

[0003] Purpose of the utility model: This application provides a battery pack and an electrical device, which aims to solve the technical problem that battery packs with downward-facing explosion-proof valves of individual cells are prone to sealing failure when subjected to external force, friction, or impact.

[0004] Technical solution: This application provides a battery pack having intersecting first, second, and third directions, the battery pack comprising:

[0005] The enclosure includes a bottom plate and multiple side plates connected to the bottom plate, which together form a receiving cavity.

[0006] A liquid cooling plate is disposed within the receiving cavity. The liquid cooling plate has a flow channel inside. The liquid cooling plate and the bottom plate enclose each other to form an exhaust channel. The liquid cooling plate has a plurality of first exhaust holes. The first exhaust holes penetrate the liquid cooling plate in the third direction and communicate with the exhaust channel. The plurality of first exhaust holes are arranged along the first direction. In the second direction, the flow channel is disposed on both sides of the first exhaust holes.

[0007] At least one side plate has a confluence channel, an air inlet, and an air outlet, the confluence channel being connected to the exhaust channel through the air inlet;

[0008] The side panel is equipped with a pressure relief device, and the pressure relief device cover seals the air outlet.

[0009] In some embodiments, the liquid cooling plate includes a first cold plate and a second cold plate connected to each other, the first cold plate and the second cold plate enclosing each other to form the flow channel, the second cold plate being disposed on the side of the first cold plate near the bottom plate and enclosing the bottom plate to form the exhaust channel, and the first exhaust hole penetrating the first cold plate and the second cold plate;

[0010] In some embodiments, the side plate includes a stepped portion having at least a portion of the air inlet, the stepped portion being connected to the first cold plate along the third direction.

[0011] In some embodiments, the battery pack includes a seal disposed between the second cold plate and the side plate and connected to the second cold plate and the side plate respectively.

[0012] In some embodiments, the side plate includes a first plate and a second plate spaced apart along the first direction, the second plate being provided with the pressure relief device;

[0013] The side panel includes a third plate and a fourth plate spaced apart along the third direction. The third plate and the fourth plate are disposed between the first plate and the second plate, and the third plate is connected to both the first plate and the second plate. The step portion is disposed between the first plate and the fourth plate. One end of the fourth plate is connected to the second plate, and the other end of the fourth plate is connected to the first plate through the step portion. The fourth plate is connected to the bottom plate along the third direction.

[0014] The stepped portion, the first plate, the second plate, the third plate, and the fourth plate together form the confluence channel.

[0015] In some embodiments, the side plate includes a fifth plate disposed within the confluence channel, the fifth plate being disposed between the third plate and the fourth plate and connected to the first plate and the second plate respectively; the fifth plate is located on the side of the pressure relief device near the bottom plate, and the fifth plate has a second exhaust hole, which is connected to the air inlet and the air outlet respectively through the confluence channel.

[0016] In some embodiments, the number of the second exhaust holes is multiple, and the cross-sectional area of ​​the multiple second exhaust holes is S1 mm. 2 The exhaust area of ​​the pressure relief device is S mm. 2 Satisfying: S1≥S; and / or

[0017] There are multiple air inlets, and the cross-sectional area of ​​each air inlet is S² mm. 2 The exhaust area of ​​the pressure relief device is S mm. 2 , satisfying: S2≥S.

[0018] In some embodiments, the battery pack further includes:

[0019] Multiple battery packs are located within the receiving cavity and on the side of the liquid cooling plate away from the base plate. Each battery pack includes multiple individual cells arranged along the first direction. Each individual cell has an explosion-proof valve facing the first vent. An electrode post is provided on the side of the individual cell away from the liquid cooling plate. The multiple battery packs are arranged along the second direction, and the multiple first vents are arranged along the second direction.

[0020] The flow channel includes multiple first sub-flow channels and multiple second sub-flow channels. The first sub-flow channels are spaced apart along the second direction, and the second sub-flow channels connect two adjacent first sub-flow channels.

[0021] In some embodiments, the liquid cooling plate includes a sealing film that covers the first vent hole.

[0022] Accordingly, this application provides an electrical device including the battery pack described above.

[0023] Beneficial Effects: The battery pack of this application embodiment has intersecting first, second, and third directions. The battery pack includes: a housing, including a bottom plate and multiple side plates connected to the bottom plate, the bottom plate and the multiple side plates enclosing a receiving cavity; a liquid cooling plate disposed within the receiving cavity, the liquid cooling plate having a flow channel inside, the liquid cooling plate and the bottom plate enclosing an exhaust channel, the liquid cooling plate having multiple first exhaust holes, the first exhaust holes penetrating the liquid cooling plate in the third direction and communicating with the exhaust channel, the multiple first exhaust holes being arranged along the first direction, and in the second direction, the flow channel being disposed on both sides of the first exhaust holes. At least one side plate has a confluence channel, an air inlet, and an air outlet, the confluence channel communicating with the exhaust channel through the air inlet; the side plate is provided with a pressure relief device, the pressure relief device sealing the air outlet. This embodiment of the application effectively integrates the venting function and the flow channel thermal management function by setting a flow channel and a first vent hole in the liquid cooling plate, setting an venting channel communicating with the first vent hole between the liquid cooling plate and the bottom plate, and setting a confluence channel connected to the venting channel in the side plate. On the one hand, it helps to improve the space utilization of the battery pack and increase the volumetric energy density. On the other hand, it can quickly expel high-temperature gases from the battery pack, reduce the internal pressure of the battery pack, and prevent damage to the battery pack or other safety problems caused by excessive pressure. In addition, setting the venting channel between the liquid cooling plate and the bottom plate can reduce the impact of venting on individual cells during thermal runaway. Furthermore, the liquid cooling plate can also play a role in shockproof sealing. When the bottom plate of the battery pack is scratched or impacted, the liquid cooling plate above the bottom plate can still play a sealing role, reducing the ingress of external moisture and the resulting short circuit, thereby improving the safety and reliability of the battery pack.

[0024] The electrical device in this application includes the battery pack described above. Therefore, the electrical device can have all the technical features and beneficial effects of the battery pack described above, which will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the structure of a battery pack according to another embodiment of this application;

[0028] Figure 3 This is an exploded view of a battery pack according to an embodiment of this application;

[0029] Figure 4 This is an exploded view of a battery pack according to another embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the structure of a liquid cooling plate according to an embodiment of this application;

[0031] Figure 6 This is a cross-sectional view of a battery pack according to an embodiment of this application;

[0032] Figure 7 yes Figure 6 Enlarged view of part A;

[0033] Figure 8 This is a schematic diagram of the structure of a side plate according to an embodiment of this application.

[0034] Reference numerals: 1. Housing; 2. Battery pack; 3. Liquid cooling plate; 4. Exhaust channel; 5. Seal; 10. Bottom plate; 11. Side plate; 12. Receiving cavity; 20. Individual battery; 30. First exhaust port; 31. Flow channel; 32. Sealing membrane; 110. Combination channel; 111. Air inlet; 112. Air outlet; 113. Pressure relief device; 114. First plate; 115. Second plate; 116. Third plate; 117. Fourth plate; 118. Fifth plate; 120. Stepped section; 200. Explosion-proof valve; 201. Terminal post; 300. First cold plate; 301. Second cold plate; 310. First sub-flow channel; 311. Second sub-flow channel; 1180. Second exhaust port; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0037] The applicant noted that with the development and popularization of new energy vehicles, the safety requirements for battery packs are becoming increasingly stringent. Common battery packs with the explosion-proof valve of the individual battery facing downwards usually only have a single layer of seal at the bottom. When conducting bottom scratch tests and ball impact tests, the seal is prone to failure, resulting in poor airtightness of the battery pack and a tendency to short circuit.

[0038] In view of the above, embodiments of this application provide a battery pack and a power-consuming device. The battery pack and power-consuming device of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0039] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a battery pack according to another embodiment of this application; Figure 3 This is an exploded view of a battery pack according to an embodiment of this application;

[0040] Figure 4 This is an exploded view of a battery pack according to another embodiment of this application; Figure 5 This is a schematic diagram of the structure of a liquid cooling plate 3 according to an embodiment of this application; Figure 6 This is a cross-sectional view of a battery pack according to an embodiment of this application; Figure 7 yes Figure 6 Enlarged view of part A; Figure 8 This is a schematic diagram of the structure of a side plate 11 according to an embodiment of this application.

[0041] refer to Figures 1 to 8 This application provides a battery pack having intersecting first direction X, second direction Y, and third direction Z, and includes a housing 1, a battery pack 2, and a liquid cooling plate 3. Figure 1 and Figure 2 As shown, the first direction X is the length direction of the housing 1, the second direction Y is the width direction of the housing 1, and the third direction Z is the thickness direction of the housing 1 or it can also be the height direction. The housing 1 includes a bottom plate 10 and multiple side plates 11. The bottom plate 10 and the multiple side plates 11 enclose a receiving cavity 12, which is the internal space of the battery pack for accommodating the battery pack 2 and the liquid cooling plate 3.

[0042] The battery pack 2 is located inside the housing cavity 12. The battery pack 2 includes a plurality of individual cells 20 arranged along the first direction X. An explosion-proof valve 200 is provided on the side of the individual cell 20 closest to the base plate 10, and a terminal post 201 is provided on the side of the individual cell 20 furthest from the base plate 10. The plurality of individual cells 20 are electrically connected to each other through the terminal post 201.

[0043] The liquid cooling plate 3 is located on the side of the battery pack 2 closest to the base plate 10, meaning it is situated between the battery pack 2 and the base plate 10. The liquid cooling plate 3 has an internal flow channel 31 for the circulation of a cooling medium, which facilitates heat exchange and cooling of the battery pack interior. The liquid cooling plate 3 and the base plate 10 enclose an exhaust channel 4. Specifically, there is a space between the liquid cooling plate 3 and the base plate 10 for venting in case of thermal runaway; this space is the aforementioned exhaust channel 4. Furthermore, the liquid cooling plate 3 has multiple first exhaust holes 30, which penetrate the liquid cooling plate 3 in the third direction Z and communicate with the exhaust channel 4. The multiple first exhaust holes 30 are arranged along the first direction X, and in the second direction Y, the flow channel 31 is located on both sides of the first exhaust holes 30.

[0044] Please refer to the following: Figure 6 and Figure 7At least one side plate 11 has a manifold 110, an air inlet 111, and an air outlet 112. The manifold 110 is connected to the exhaust channel 4 through the air inlet 111. The side plate 11 is provided with a pressure relief device 113, which covers the air outlet 112. The pressure relief device 113 is configured to open when thermal runaway occurs in the battery pack, causing a large amount of gas to be generated and the internal pressure of the battery pack rises to the opening pressure set by the pressure relief device 113, so as to discharge high-temperature and high-pressure gas. The high-temperature and high-pressure gas enters the exhaust channel 4 through the explosion-proof valve 200 and the first exhaust port 30, then enters the manifold 110 through the air inlet 111, and finally is discharged through the pressure relief device 113 that covers the air outlet 112.

[0045] In the battery pack of this embodiment, by providing a flow channel 31 and a first vent 30 on the liquid cooling plate 3, and an venting channel 4 communicating with the first vent 30 between the liquid cooling plate 3 and the bottom plate 10, and a confluence channel connected to the venting channel on the side plate, the venting function and the flow channel thermal management function can be effectively integrated. On the one hand, this helps to improve the space utilization of the battery pack and increase the volumetric energy density. On the other hand, by providing a pressure relief device 113 on the side plate 11, high-temperature gas can be quickly discharged from the battery pack, reducing the internal pressure of the battery pack and preventing damage to the battery pack or other safety problems caused by excessive pressure. In addition, placing the venting channel 4 between the liquid cooling plate 3 and the bottom plate 10 can reduce the impact of venting on the individual cells 20 during thermal runaway. Furthermore, the liquid cooling plate 3 can also play a role in shockproof sealing. When the bottom plate 10 of the battery pack is scratched or impacted, the liquid cooling plate 3 can still play a sealing role above the bottom plate 10, reducing the ingress of external moisture and causing short circuits and other problems, thereby improving the safety and reliability of the battery pack.

[0046] Specifically, please refer to the following: Figure 3 and Figure 4In some embodiments, the liquid cooling plate 3 includes a first cold plate 300 and a second cold plate 301 connected to each other, and the first cold plate 300 and the second cold plate 301 enclose the aforementioned flow channel 31. By inputting coolant into one end of the flow channel 31 and outputting it from the other end of the flow channel 31, the coolant is circulated. During the circulation of the coolant, the heat of the individual battery 20 is carried away, thereby realizing the thermal management function of the individual battery 20. The second cold plate 301 and the bottom plate 10 enclose an exhaust channel 4. The liquid cooling plate 3 has a plurality of first exhaust holes 30 arranged along the first direction X. The first exhaust holes 30 penetrate the first cold plate 300 and the second cold plate 301 and are connected to the exhaust channel 4. Each first exhaust hole 30 is opposite to the explosion-proof valve 200 of at least one single cell 20. By integrating the plurality of first exhaust holes 30 onto the liquid cooling plate 3, high-temperature gas can be discharged through the first exhaust holes 30 and the exhaust channel 4 when the single cell 20 experiences thermal runaway, thereby effectively reducing the pressure inside the battery pack and preventing other single cells 20 from experiencing thermal runaway, thus maintaining the overall safety and stability of the battery pack. In the second direction Y, flow channels 31 are arranged on both sides of the first exhaust holes 30. The flow channels 31 and the first exhaust holes 30 are arranged in an alternating manner, which can integrate the functions of exhaust and thermal management into one, making the layout more compact and effectively reducing space occupation.

[0047] Furthermore, the liquid cooling plate 3 in this embodiment can act as a sealing layer, and the connection between the bottom plate 10 and the side plate 11 provides a second sealing layer. When the bottom plate 10 of the battery pack is scratched or impacted, the liquid cooling plate 3 can still maintain its sealing effect, preventing external moisture from entering the battery pack and causing short circuits or other problems. In addition, the terminal post 201 is located on the side of the individual battery cell 20 away from the bottom plate 10, which can reduce the impact of thermal runaway on the electrical connection between the individual batteries 20, achieve electrothermal separation, and improve the safety and reliability of the battery pack.

[0048] Please see Figure 4 In some embodiments, the liquid cooling plate 3 includes a sealing film 32 that covers the first vent 30. Figure 4 In the illustrated embodiment, there can be multiple sealing films 32, which are spaced apart along the second direction Y to seal multiple first vent holes 30. In normal operation, the sealing films 32 seal the liquid cooling plate 3, preventing coolant from leaking out of the flow channel 31 through the first vent holes 30. This also ensures the sealing effect of the liquid cooling plate 3, preventing external moisture from entering the battery pack and causing short circuits. When a single battery cell 20 experiences thermal runaway, the sealing film 32 corresponding to the explosion-proof valve 200 is ruptured, allowing high-temperature gas to escape through the first vent holes 30 not covered by the sealing film 32 and through the exhaust channel 4.

[0049] exist Figure 7 and Figure 8In the illustrated embodiment, the side plate 11 includes a stepped portion 120, which has at least a partial air inlet 111. The stepped portion 120 is connected to the first cold plate 300 along a third direction Z. This application connects the side plate 11 and the liquid-cooled plate 3 by providing the stepped portion 120. Simultaneously, the air inlet 111 in the stepped portion 120 ensures that the gas in the exhaust channel 4 flows rapidly through the air inlet 111 into the confluence channel 110 in the side plate 11, effectively improving the gas exhaust speed.

[0050] exist Figure 7 and Figure 8 In the illustrated embodiment, the side plate 11 includes a first plate 114 and a second plate 115 spaced apart along a first direction X, and the second plate 115 is provided with a pressure relief device 113; the side plate 11 includes a third plate 116 and a fourth plate 117 spaced apart along a third direction Z, the third plate 116 and the fourth plate 117 are disposed between the first plate 114 and the second plate 115, and the third plate 116 is connected to the first plate 114 and the second plate 115 respectively; a stepped portion is disposed between the first plate 114 and the fourth plate 117, one end of the fourth plate 117 is connected to the second plate 115, the other end of the fourth plate 117 is connected to the first plate 114 through the stepped portion, the fourth plate 117 is connected to the bottom plate 10 along the third direction Z, and the fourth plate 117 and the bottom plate 10 are connected along the third direction Z, so that the side plate 11 and the bottom plate 10 form an integral structure, further enhancing the support strength of the bottom of the battery pack. The stepped portion, the first plate 114, the second plate 115, the third plate 116 and the fourth plate 117 enclose and form a confluence channel 110 to guide the gas entering through the air inlet 111 and discharge it through the pressure relief device 113 that seals the air outlet 112, so as to avoid uneven local pressure caused by gas in the battery pack and improve exhaust efficiency.

[0051] exist Figure 7 and Figure 8In the illustrated embodiment, the side plate 11 includes a fifth plate 118, which is disposed within the confluence channel 110. The fifth plate 118 is located between the third plate 116 and the fourth plate 117 and is connected to the first plate 114 and the second plate 115, respectively. The fifth plate 118 is located on the side of the pressure relief device 113 near the bottom plate 10. The fifth plate 118 has a second exhaust port 1180, which is connected to the air inlet 111 and the air outlet 112 through the confluence channel 110, respectively. The second exhaust port 1180 on the fifth plate 118 is connected to the air inlet 111 and the air outlet 112 through the confluence channel 110, thereby further improving the control of gas flow. After the gas enters the manifold 110 from the inlet 111, the fifth plate 118 can reasonably divide the gas, so that the gas can be more evenly distributed in the manifold 110, avoiding the situation where the gas flow rate is too fast or too slow in the channel, and ensuring that the gas can be discharged efficiently.

[0052] In some embodiments, the number of second vent holes 1180 is multiple, and the cross-sectional area of ​​the multiple second vent holes 1180 is S1 mm. 2 The exhaust area of ​​the pressure relief device 113 is S mm. 2 The condition is satisfied that S1≥S. It can be understood that when S1≥S, there is sufficient channel area for the gas flowing from the manifold 110 through the second vent 1180 to the pressure relief device 113, allowing the gas to flow quickly to the pressure relief device 113, fully utilizing the function of the pressure relief device 113, ensuring that the internal pressure of the battery pack can be released in a timely manner, maintaining the internal pressure balance of the battery pack, reducing the safety risks caused by excessive internal pressure, and improving the safety and reliability of the battery pack.

[0053] In some embodiments, the number of air inlets 111 is multiple, and the cross-sectional area of ​​the multiple air inlets 111 is S² mm. 2 The exhaust area of ​​the pressure relief device 113 is S mm. 2 The condition is satisfied that S2≥S. It can be understood that when S2≥S, there is sufficient channel area for the gas flowing from the exhaust channel 4 through the intake port 111 to the confluence channel 110, allowing the gas to flow quickly to the pressure relief device 113. This fully utilizes the pressure relief device 113, ensuring that the internal pressure of the battery pack is released in a timely manner, maintaining the internal pressure balance, reducing safety risks caused by excessive internal pressure, and improving the safety and reliability of the battery pack.

[0054] exist Figure 2In the illustrated embodiment, there are multiple battery packs 2 arranged along a second direction Y, and multiple first vents 30 arranged along the second direction Y to fully utilize the space in this direction and improve the energy density of the battery pack. The flow channel 31 includes multiple first sub-flow channels 310 and multiple second sub-flow channels 311. The first sub-flow channels 310 are spaced apart along the second direction Y to ensure that the heat generated by each battery pack 2 can be carried away through the first sub-flow channels 310, preventing localized overheating of the battery pack 2. The second sub-flow channels 311 connect two adjacent first sub-flow channels 31 to connect the multiple first sub-flow channels 31, thereby ensuring that the coolant can circulate between the multiple first sub-flow channels 310 and second sub-flow channels 311, simplifying the thermal management system of the battery pack.

[0055] exist Figure 3 and Figure 7 In the illustrated embodiment, the battery pack includes a seal 5, which is disposed between the second cold plate 301 and the side plate 11 and connected to both. This arrangement improves the sealing performance between the bottom plate 10 and the side plate 11, preventing gas inside the battery pack from leaking out through the gap between them, and also preventing external moisture from entering the battery pack, thus avoiding short circuits and other problems, thereby ensuring the safety and stability of the battery pack.

[0056] Accordingly, this application also provides an electrical device, including the aforementioned single battery cell, or the aforementioned battery pack. Therefore, the electrical device can possess all the technical features and beneficial effects of the aforementioned single battery cell or battery pack, which will not be elaborated upon here. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, and power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0057] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0058] The battery pack and power device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, The battery pack has intersecting first, second, and third directions, and the battery pack includes: The housing includes a bottom plate and a plurality of side plates connected to the bottom plate, the bottom plate and the plurality of side plates forming a receiving cavity; A liquid cooling plate is disposed within the receiving cavity. The liquid cooling plate has a flow channel inside. The liquid cooling plate and the bottom plate enclose each other to form an exhaust channel. The liquid cooling plate has a plurality of first exhaust holes. The first exhaust holes penetrate the liquid cooling plate in the third direction and communicate with the exhaust channel. The plurality of first exhaust holes are arranged along the first direction. In the second direction, the flow channel is disposed on both sides of the first exhaust holes. At least one of the side panels has a confluence channel, an air inlet, and an air outlet, wherein the confluence channel is connected to the exhaust channel through the air inlet; The side plate is equipped with a pressure relief device, which covers the air outlet.

2. The battery pack according to claim 1, characterized in that, The liquid cooling plate includes a first cold plate and a second cold plate connected to each other. The first cold plate and the second cold plate enclose each other to form the flow channel. The second cold plate is disposed on the side of the first cold plate near the bottom plate and encloses the bottom plate to form the exhaust channel. The first exhaust hole passes through the first cold plate and the second cold plate.

3. The battery pack according to claim 2, characterized in that, The side plate includes a stepped portion having at least a portion of the air inlet, and the stepped portion is connected to the first cold plate along the third direction.

4. The battery pack according to claim 2, characterized in that, The battery pack includes a seal disposed between the second cold plate and the side plate and connected to the second cold plate and the side plate respectively.

5. The battery pack according to claim 3, characterized in that, The side plate includes a first plate and a second plate spaced apart along the first direction, and the second plate is provided with the pressure relief device. The side panel includes a third plate and a fourth plate spaced apart along the third direction. The third plate and the fourth plate are disposed between the first plate and the second plate, and the third plate is connected to both the first plate and the second plate. The step portion is disposed between the first plate and the fourth plate. One end of the fourth plate is connected to the second plate, and the other end of the fourth plate is connected to the first plate through the step portion. The fourth plate is connected to the bottom plate along the third direction. The stepped portion, the first plate, the second plate, the third plate, and the fourth plate together form the confluence channel.

6. The battery pack according to claim 5, characterized in that, The side plate includes a fifth plate, which is disposed within the confluence channel. The fifth plate is located between the third plate and the fourth plate and is connected to the first plate and the second plate, respectively. The fifth plate is located on the side of the pressure relief device near the bottom plate. The fifth plate has a second exhaust hole, which is connected to the air inlet and the air outlet through the confluence channel, respectively.

7. The battery pack according to claim 6, characterized in that, There are multiple second exhaust holes, and the cross-sectional area of ​​the multiple second exhaust holes is S1 mm. 2 The exhaust area of ​​the pressure relief device is S mm. 2 Satisfying: S1≥S; and / or There are multiple air inlets, and the cross-sectional area of ​​each air inlet is S² mm. 2 The exhaust area of ​​the pressure relief device is S mm. 2 , satisfying: S2≥S.

8. The battery pack according to claim 1, characterized in that, The battery pack also includes: Multiple battery packs are located within the receiving cavity and on the side of the liquid cooling plate away from the base plate. Each battery pack includes multiple individual cells arranged along the first direction. Each individual cell has an explosion-proof valve facing the first vent. An electrode post is provided on the side of the individual cell away from the liquid cooling plate. The multiple battery packs are arranged along the second direction, and the multiple first vents are arranged along the second direction. The flow channel includes multiple first sub-flow channels and multiple second sub-flow channels. The first sub-flow channels are spaced apart along the second direction, and the second sub-flow channels connect two adjacent first sub-flow channels.

9. The battery pack according to claim 1, characterized in that, The liquid cooling plate includes a sealing film that covers the first vent hole.

10. An electrical device, characterized in that, The battery pack includes any one of claims 1 to 9.

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