Battery pack and powered device

Abstract

The present disclosure relates to a battery pack and an electric device, the battery pack comprising a shell having a battery compartment accommodating battery monomers, a control compartment accommodating electrical elements, and a pressure relief channel communicating with a pressure relief piece of the battery monomers, the shell being provided with a communication port communicating with the pressure relief channel and the control compartment. Through the above technical solution, the battery pack provided by the present disclosure can meet the air tightness test requirement of the whole battery pack, and improve the safety of the whole battery pack.

Description

Technical Field

[0001] This disclosure relates to the field of battery pack technology, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] In related technologies, how to conduct airtightness testing on the entire battery pack to ensure that the entire battery pack has good airtightness, so that the battery pack can better adapt to various complex environments and reduce the performance degradation caused by environmental factors has become a research goal for industry professionals. Utility Model Content

[0003] The purpose of this disclosure is to provide a battery pack and electrical device that can meet the requirements for airtightness testing of the entire battery pack while also improving the safety of the entire battery pack.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a battery pack including a housing having a battery compartment for accommodating individual battery cells, a control compartment for accommodating electrical components, and a pressure relief channel communicating with a pressure relief component of the individual battery cells. The housing is provided with a communication port communicating with the pressure relief channel and the control compartment.

[0005] Optionally, the location of the connection port is configured such that the discharge path of the connection port avoids at least part of the electrical components.

[0006] Optionally, the position of the connection port is configured such that the minimum distance between the connection port and the outer bottom surface of the housing in the height direction of the battery pack is greater than or equal to a first preset distance.

[0007] Optionally, the first preset distance is not less than the distance between the top surface of the battery cell and the bottom surface of the casing.

[0008] Optionally, the housing includes a base plate assembly and a frame, the frame being arranged circumferentially around the base plate assembly; At least one of the base plate assembly and the frame is provided with at least a portion of the pressure relief channel, and at least one of the base plate assembly and the frame is provided with the communication port.

[0009] Optionally, the battery pack further includes a top cover, the top cover, the frame, and the bottom plate assembly forming a receiving space, in which the battery compartment and the control compartment are located; or, The battery pack also includes a top cover and a maintenance cover. The top cover, the frame, and the bottom plate assembly form an accommodating space. The battery compartment is located in the accommodating space. The maintenance cover is located on the side of the top cover away from the accommodating space. The control compartment is located between the maintenance cover and the top cover. The frame is provided with the communication port.

[0010] Optionally, the base plate assembly includes a first plate and a second plate, the first plate supporting the battery cell, at least a portion of the pressure relief channel forming between the first plate and the second plate, and the first plate having the communication port; and / or, The frame has a cavity forming at least part of the pressure relief channel, and the communication port is provided on the inner wall or top wall of the frame.

[0011] Optionally, the connecting opening is provided on the inner wall of the frame, and the connecting opening is arranged adjacent to the top wall of the frame.

[0012] Optionally, the battery pack further includes a blocking structure, wherein at least one of the communication ports is provided with the blocking structure on the flow path through which the material flows, so as to change the flow direction of the material through the blocking structure, and / or buffer and / or absorb energy from the material.

[0013] Optionally, the blocking structure is disposed within the pressure relief channel and / or the control chamber.

[0014] Optionally, the blocking structure includes a housing and a stop portion, the housing having a communicating cavity communicating with the communicating port, and the stop portion being disposed inside and / or outside the communicating cavity.

[0015] Optionally, the outer casing is disposed within the control compartment and has a first outlet communicating with the communicating cavity and the control compartment; The first outlet is positioned such that the discharge path of the connection port avoids at least a portion of the electrical components.

[0016] Optionally, the housing includes a top plate and side plates surrounding the top plate and the communication opening, with the first outlet formed on the side plates.

[0017] Optionally, the stop portion includes a first baffle disposed within the communicating cavity; When the blocking structure and the corresponding connecting port are disposed on the frame of the battery pack, the first baffle forms a collection groove on the side facing the connecting port.

[0018] Optionally, the stop portion includes a filling structure disposed within the communicating cavity, the filling structure having a gap connecting the pressure relief channel and the control chamber.

[0019] Optionally, the filling structure includes foam; Wherein, the foam includes melamine foam; and / or, The foam is connected to the housing by adhesive members arranged around the communication opening; and / or, The foam is provided with a thinning groove that is recessed inward along the extension direction of the communicating cavity.

[0020] Optionally, the stop portion includes multiple second baffles disposed within the communicating cavity, the multiple second baffles being arranged sequentially along the flow path; The second baffle is provided with through holes for the material to flow through, and the through holes on adjacent second baffles are staggered in a direction perpendicular to the flow path; and / or, Any two adjacent second baffles are staggered in a direction perpendicular to the flow path to form a bend-shaped flow channel.

[0021] Optionally, the outer casing is disposed within the control compartment, and the outer casing is connected to the communication port through a first cylindrical section and to the control compartment through a second cylindrical section.

[0022] Optionally, the stop portion includes a funnel structure disposed within the communicating cavity, the inner diameter of the funnel structure gradually decreasing along the flow path of the material toward the control chamber.

[0023] Optionally, solid particles are provided on the inner wall surface of the outer shell. The solid particles are configured to be detachably connected to the inner wall surface of the outer shell so that when the solid particles detach from the outer shell, they can block the second outlet of the funnel structure.

[0024] Optionally, the solid particles are adhered to the inner wall surface of the outer casing; and / or, The maximum outer diameter of the solid particles is greater than the inner diameter of the second outlet of the funnel structure.

[0025] Optionally, a thermally decomposable solid layer is provided on the wall surface of at least one of the outer casing and the stop portion, wherein the thermally decomposable solid layer is capable of absorbing heat and decomposing.

[0026] A second aspect of this disclosure provides an electrical device including the battery pack provided in the first aspect.

[0027] The battery pack provided in this disclosure utilizes the aforementioned technical solution, which connects the pressure relief channel and the control compartment via a connecting port. This allows for simultaneous airtightness testing of the entire battery pack, enabling simultaneous airtightness testing of multiple spaces. This reduces testing time and improves on-site efficiency. Furthermore, by connecting the pressure relief channel and control compartment via the connecting port, the interference from internal leaks between different spaces within the battery pack can be eliminated during airtightness testing. This facilitates more accurate detection of external leaks between the battery pack and the external environment, improving testing reliability and ensuring high airtightness throughout the battery pack. This allows the battery pack to better adapt to various complex environments and reduces the impact of external environmental factors on the battery pack.

[0028] In addition, by connecting the pressure relief channel and the control compartment through the connecting port, a large connected space can be formed within the battery pack. In the event of thermal runaway of the battery pack, the instantaneous high temperature and high pressure can be released and absorbed through the large space, thereby reducing the local pressure within the space and reducing the possibility of battery pack deformation, abnormal noise, rupture or explosion. Furthermore, by absorbing the instantaneous high temperature and high pressure through the large space, the risk of thermal spread of individual battery cells within the battery compartment can be reduced, which helps to improve the safety of the entire battery pack.

[0029] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the battery pack provided in an exemplary embodiment of this disclosure; Figure 2 This is a schematic diagram of the battery pack structure after the top cover is removed, provided in an exemplary embodiment of this disclosure; Figure 3 yes Figure 2 A magnified view of the middle F position; Figure 4 yes Figure 2 A magnified view of the area at position G in the middle; Figure 5 This is a top view of the battery pack after the top cover has been removed, provided in an exemplary embodiment of this disclosure; Figure 6 yes Figure 5 Cross-sectional view at position AA; Figure 7 yes Figure 5 Cross-sectional view at position BB; Figure 8 This is a schematic diagram of the blocking structure provided in the first embodiment of this disclosure; Figure 9 This is a schematic diagram of the blocking structure provided in the second embodiment of this disclosure; Figure 10 This is a cross-sectional view of the blocking structure provided in the second embodiment of this disclosure; Figure 11 This is a schematic diagram of the blocking structure provided in the third embodiment of this disclosure; Figure 12 This is an exploded schematic diagram of the blocking structure provided in the third embodiment of this disclosure; Figure 13 This is a schematic diagram of the blocking structure provided in the fourth embodiment of this disclosure; Figure 14 yes Figure 13 A magnified view of the area at position C in the middle; Figure 15 yes Figure 5 A magnified view of a portion of position D in the middle; Figure 16 yes Figure 15 Cross-sectional view of the EE location; Figure 17 This is a schematic diagram of the blocking structure provided in the fifth embodiment of this disclosure; Figure 18 This is a schematic diagram of the blocking structure provided in the sixth embodiment of this disclosure; Figure 19 This is a schematic diagram of the battery pack provided in the second embodiment of this disclosure; Figure 20 This is a cross-sectional view of the battery pack provided in the second embodiment of this disclosure; Figure 21 yes Figure 20 A magnified view of the middle K position.

[0031] Explanation of reference numerals in the attached figures 1-Shell; 110-Battery compartment; 120-Control compartment; 130-Pressure relief channel; 140-Connecting port; 150-Outer bottom surface; 160-Base plate assembly; 161-First plate; 162-Second plate; 170-Frame; 171-Cavity; 172-Inner wall; 173-Top wall; 180-Separator; 2-Battery cell; 210-Pressure relief component; 3-Electrical component; 4-Top cover; 5-Accommodation space; 6-Maintenance cover; 7-Blocking structure; 710-Shell ; 711-Connecting cavity; 712-First outlet; 713-Top plate; 714-Side plate; 720-Stop part; 721-First baffle; 722-Collection tank; 723-Filling structure; 7231-Foam; 7232-Adhesive part; 7233-Thinning groove; 724-Second baffle; 7241-Through hole; 725-Function funnel structure; 730-First cylindrical section; 740-Second cylindrical section; 750-Solid particles; 8-Thermal decomposition solid layer; 9-Pressure relief structure. Detailed Implementation

[0032] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0033] It should be noted that all actions involving the acquisition of signals, information, or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with authorization from the owner of the relevant device.

[0034] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower dimensions within the space of the battery pack when it is in use. "Inner" and "outer" refer to the inner and outer dimensions relative to the outline of the component or structure itself. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same elements.

[0035] According to a first aspect of this disclosure, a battery pack is provided, with reference to... Figures 1 to 21 As shown, the battery pack includes a housing 1, which has a battery compartment 110 for accommodating individual battery cells 2, a control compartment 120 for accommodating electrical components 3, and a pressure relief channel 130 connected to a pressure relief component 210 of the individual battery cells 2. The housing 1 is provided with a communication port 140 connecting the pressure relief channel 130 and the control compartment 120.

[0036] Through the above-described technical solution, namely the battery pack provided in this disclosure, the pressure relief channel 130 and the control compartment 120 are connected via the communication port 140, thereby meeting the airtightness testing requirements of the entire battery pack. Specifically, airtightness testing can be performed simultaneously on the connected pressure relief channel 130 and the control compartment 120, allowing for simultaneous airtightness testing of multiple spaces. This helps reduce testing time and improves on-site work efficiency. Furthermore, by connecting the pressure relief channel 130 and the control compartment 120 via the communication port 140, and since multiple spaces within the battery pack (such as the pressure relief channel 130 and the control compartment 120) are interconnected, interference from internal leakage problems between multiple spaces within the battery pack can be eliminated during airtightness testing. This facilitates more accurate detection of external leakage points between the battery pack and the external environment, improving testing reliability and ensuring high airtightness of the entire battery pack. This allows the battery pack to better adapt to various complex environments and reduces the impact of the external environment on the battery pack.

[0037] In addition, by connecting the pressure relief channel 130 and the control compartment 120 through the connection port 140, a large connected space can be formed inside the battery pack. In the event of thermal runaway of the battery pack, the instantaneous high temperature and high pressure can be released and absorbed through the large space, thereby reducing the local pressure in the space and reducing the possibility of battery pack deformation, abnormal noise, rupture or explosion. Furthermore, by absorbing the instantaneous high temperature and high pressure through the large space, the risk of thermal spread of the battery cells 2 in the battery compartment 110 can be reduced, which helps to improve the safety of the entire battery pack.

[0038] The control compartment 120 mentioned above can also be referred to as the high-voltage compartment. The electrical components 3 may include, but are not limited to, one or more of the following: a battery management system, connecting copper busbars, high-voltage busbars, high-voltage relays / contactors, fuses, high-voltage connectors, voltage sensors, temperature sensors, and current sensors. The battery cells 2 may be in the form of pouch cells, prismatic cells, or cylindrical cells, and this disclosure is not limited thereto.

[0039] It should be noted that since a pressure relief structure 9 can be provided on the housing 1, for example, at least one of the bottom plate assembly 160 (described in detail below) and the frame 170 (described in detail below) of the housing 1 can be provided with a pressure relief structure 9 that communicates with the pressure relief channel 130, so that the pressure relief channel 130 can be connected to the outside of the housing 1 through the pressure relief structure 9. With this arrangement, in the event of, for example, thermal runaway of the battery pack, even if the instantaneous high temperature and high pressure can be absorbed by the large space, thereby reducing the local pressure in the space, since the gas pressure in the pressure relief channel 130 is much higher than the opening pressure of the pressure relief structure 9 during thermal runaway, the pressure relief structure 9 can still be ensured to open quickly to relieve the pressure in the pressure relief channel 130 during thermal runaway of the battery pack.

[0040] The pressure relief structure 9 and pressure relief component 210 mentioned above can be constructed as, for example, an explosion-proof valve, a pressure relief valve or a safety valve, etc., and this disclosure does not specifically limit them.

[0041] In addition, to improve the safety of the battery pack, refer to Figures 1 to 18 As shown, the battery compartment 110 and the control compartment 120 can be separated by, for example, a partition 180. This arrangement can separate the electrical components 3 in the control compartment 120 from the individual battery cells 2 in the battery compartment 110, ensuring stable operation of the battery pack and improving its safety.

[0042] This disclosure does not specifically limit the specific structure of the aforementioned partition 180, and those skilled in the art can design it adaptively according to actual application needs. It is understood that the partition 180 may not completely separate the control compartment 120 and the battery compartment 110; that is, the control compartment 120 and the battery compartment 110 may be connected through a gap above the partition 180. Alternatively, the partition 180 may completely separate the control compartment 120 and the battery compartment 110. This disclosure does not specifically limit this. Furthermore, if, for example, the control compartment 120 and the battery compartment 110 are connected, during the overall airtightness test of the battery pack, since the control compartment 120 and the battery compartment 110 are connected, the airtightness test of the pressure relief channel 130, the control compartment 120, and the battery compartment 110 can be performed simultaneously, which helps to reduce testing time and improve testing efficiency. Furthermore, during the airtightness test of the entire battery pack, the control compartment 120 can be connected to the pressure relief structure 9 through the pressure relief channel 130 to facilitate airtightness testing via, for example, the pressure relief structure 9. This disclosure is not limited thereto.

[0043] Furthermore, considering that after the pressure relief channel 130 and the control compartment 120 are connected, in the event of thermal runaway, for example, high-temperature and high-pressure gas will flow from the pressure relief channel 130 into the control compartment 120 through the connection port 140, in order to prevent the high-temperature and high-pressure gas from directly blowing into the electrical components 3 inside the control compartment 120, in some embodiments, the position of the connection port 140 can be configured so that the discharge path of the connection port 140 avoids at least part of the electrical components 3, thereby protecting the electrical components 3 and reducing the risk of short circuits caused by high-temperature and high-pressure gas entering the control compartment 120. In addition, the arrangement of a large space also helps to reduce the local pressure of high-temperature and high-pressure gas, reduce the possibility of battery pack deformation, abnormal noise, rupture or explosion, and improve the safety of the entire battery pack.

[0044] Furthermore, in some implementations, references Figure 7 As shown, the position of the connector 140 can be configured such that the connector 140 is in the height direction of the battery pack (see reference). Figure 6The minimum distance h between the outer bottom surface 150 of the housing 1 and the left-right direction of the middle drawing is greater than or equal to the first preset distance. With this arrangement, the pressure relief channel 130 and the control compartment 120 are connected through the connecting port 140. At the same time, since the connecting port 140 has a certain height distance between the outer bottom surface 150 of the housing 1 and the battery pack in the height direction, even if water seeps into, for example, the bottom plate assembly 160 (which will be described in detail below), the risk of liquid backflow into the control compartment 120 can be reduced.

[0045] It should be noted that, in order to better reduce the possibility of liquid backflow into the control chamber 120, the position of the connecting port 140 in the height direction of the battery pack can be configured to be as far away as possible from the outer bottom surface 150 of the housing 1. That is, it can be understood that in the height direction of the battery pack, the position of the connecting port 140 can be as high as possible. For example, the first preset distance can be no less than the distance between the top surface of the battery cell 2 and the outer bottom surface 150 of the housing 1. This arrangement allows the position of the connecting port 140 to be higher than the height of the battery cell 2, so as to keep the connecting port 140 as far away as possible from the position of the electrical component 3, thereby reducing the risk of short circuit caused by high temperature and high pressure gas entering the control chamber 120. Furthermore, by configuring the position of the connecting port 140 to be higher than the height of the battery cell 2, the possibility of liquid backflow into the control chamber 120 can also be better reduced. For example, even if the entire battery pack is tilted at 30°, there will be no risk of liquid backflow into the control chamber 120, which helps to improve the safety of the battery pack.

[0046] In some embodiments, the number of connection ports 140 can be one or more. For example, the number and location of the connection ports 140 can be adaptively set according to actual application requirements. For instance, the connection ports 140 can be opened on the wall surface of, for example, the base plate assembly 160 and / or the frame 170. The purpose is simply to enable communication between the pressure relief channel 130 and the control chamber 120. This disclosure does not impose specific limitations on this. Furthermore, it should be noted that having multiple connection ports 140 facilitates the rapid flow of gas between, for example, the pressure relief channel 130 and the control chamber 120, improving the detection efficiency during, for example, whole-pack airtightness testing. It also facilitates the rapid balance of air pressure within the pressure relief channel 130 and the control chamber 120, reducing the possibility of battery pack deformation and abnormal noise problems. This allows the battery pack to better adapt to various complex environments and reduces the impact of the external environment on the battery pack.

[0047] Exemplarily, in some implementations, reference is made to Figures 1 to 21As shown, the housing 1 may include a base plate assembly 160 and a frame 170. The frame 170 is arranged circumferentially around the base plate assembly 160. At least one of the base plate assembly 160 and the frame 170 is provided with at least a partial pressure relief channel 130. At least one of the base plate assembly 160 and the frame 170 is provided with a communication port 140 to achieve the purpose of communicating the pressure relief channel 130 with the control compartment 120, so as to facilitate the implementation of airtightness testing requirements within the entire battery pack.

[0048] Among them, such as Figure 1 As shown, the battery pack may also include a top cover 4, and the top cover 4, the frame 170 and the base plate assembly 160 form a receiving space 5. The battery compartment 110 and the control compartment 120 are located in the receiving space 5. This arrangement allows the control compartment 120 to be located between the top cover 4 and the base plate assembly 160. In order to achieve the purpose of connecting the pressure relief channel 130 with the control compartment 120, the connection port 140 may be arranged on, for example, the base plate assembly 160 and / or the frame 170, so as to facilitate the subsequent airtightness test of the entire battery pack.

[0049] For example, such as Figures 15 to 18 As shown, the base plate assembly 160 may include a first plate 161 and a second plate 162. The first plate 161 is used to support the battery cell 2. At least a partial pressure relief channel 130 is formed between the first plate 161 and the second plate 162. The first plate 161 is provided with the aforementioned communication port 140 so as to enable the pressure relief channel 130 to communicate with the control compartment 120.

[0050] It should be noted that the first plate 161 may include a support plate structure with the aforementioned communication port 140. The support plate structure supports the battery cell 2 and provides a supporting function. Alternatively, the first plate 161 may also include a liquid cooling plate structure with the aforementioned communication port 140. The liquid cooling plate structure cools the battery cell 2 and also provides cooling and temperature reduction in the event of thermal runaway of the battery pack.

[0051] Optionally, such as Figures 7 to 14 As shown, the frame 170 may have a cavity 171 forming at least part of the pressure relief channel 130, and the inner wall 172 of the frame 170 may be provided with the aforementioned communication port 140 to achieve the purpose of connecting the pressure relief channel 130 with the control chamber 120. This disclosure does not specifically limit such modifications, and those skilled in the art can design them adaptively according to actual application needs.

[0052] Additionally, it should be noted that the reference... Figure 7As shown, when a connecting port 140 is provided on the inner wall 172 of the frame 170, the connecting port 140 can be arranged adjacent to the top wall 173 of the frame 170. This arrangement allows the position of the connecting port 140 in the height direction of the battery pack to be as far away as possible from the outer bottom surface 150 of the housing 1, reducing the possibility of liquid backflow into the control compartment 120. It also allows the connecting port 140 to be arranged as far away as possible from the electrical components 3, reducing the risk of short circuits caused by high-temperature and high-pressure gas entering the control compartment 120.

[0053] In some alternative implementations, reference Figures 19 to 21 As shown, the battery pack may also include a top cover 4 and a maintenance cover 6, and the top cover 4, the frame 170 and the bottom plate assembly 160 form a receiving space 5. The battery compartment 110 is located in the receiving space 5, the maintenance cover 6 is located on the side of the top cover 4 away from the receiving space 5, and the control compartment 120 is located between the maintenance cover 6 and the top cover 4. This arrangement allows the control compartment 120 to be located between the maintenance cover 6 and the top cover 4. In order to achieve the purpose of connecting the pressure relief channel 130 with the control compartment 120, the connection port 140 can be arranged on, for example, the frame 170. For example, the connection port 140 can be opened on the top wall 173 of the frame 170 to achieve the purpose of connecting the pressure relief channel 130 with the control compartment 120.

[0054] It is understood that the form of the control compartment 120, battery compartment 110 and pressure relief channel 130 in the battery pack is not limited to the two forms mentioned above. In some other embodiments, the battery compartment 110 and pressure relief channel 130 can be adjacent in the horizontal direction, and the control compartment 120 is located above the battery compartment 110 in the height direction.

[0055] In some implementations, reference Figures 2 to 18 As shown, the battery pack may also include a blocking structure 7. At least one flow path through which the material flows through the communication port 140 is provided with a blocking structure 7 to change the flow direction of the material and / or buffer and / or absorb energy from the material. Thus, by setting up the blocking structure 7, not only can the flow direction of the material be changed to prevent high-temperature and high-pressure gas from directly blowing into electrical components 3, such as in the control chamber 120, during thermal runaway, but it can also absorb some of the impact force of the material while changing the flow direction. This enables the material flowing through the communication port 140 (such as high-temperature and high-pressure gas during thermal runaway) to be buffered and energy absorbed, thereby reducing the gas temperature and / or gas pressure, protecting the electrical components 3, reducing the risk of short circuits caused by high-temperature and high-pressure gas entering the control chamber 120, and improving the safety of the battery pack.

[0056] The aforementioned substances may include, but are not limited to, one or more of the following: gas, a mixture of particles ejected from the pressure relief device 210 of the battery cell 2 during thermal runaway, and electrolyte. The gas may be, for example, a normal temperature and pressure gas inside the battery pack during normal operation, or, for example, a normal temperature and pressure gas introduced into the battery pack during a battery pack airtightness test, or, for example, a high temperature and high pressure gas inside the battery pack during thermal runaway. This disclosure does not specifically limit the gas in this regard.

[0057] Additionally, it should be noted that the aforementioned blocking structure 7 can be installed, for example, within the pressure relief channel 130 and / or the control chamber 120. This disclosure does not specifically limit such variations. The purpose is to arrange the blocking structure 7, for example, on the flow path of the substance, so as to change the flow direction of the substance through the blocking structure 7, and / or buffer and / or absorb energy from the substance.

[0058] The blocking structure 7 can be designed in any suitable manner; for example, in some embodiments, refer to Figures 2 to 18 As shown, the blocking structure 7 may include a housing 710 and a stop portion 720. The housing 710 has a communicating cavity 711, which is connected to the aforementioned communicating port 140. The stop portion 720 is disposed inside and / or outside the communicating cavity 711, so as to enable the flow direction of the material to be changed by the stop portion 720, and / or to buffer and / or absorb energy from the material.

[0059] It should be noted that the outer shell 710 of the aforementioned blocking structure 7 can be detachably connected to the base plate assembly 160 and / or the frame 170 by fasteners such as bolts. This disclosure is not limited thereto. The purpose is to enable the blocking structure 7 to be stably connected to the base plate assembly 160 and / or the frame 170.

[0060] Exemplarily, in some implementations, reference is made to Figure 7 , Figure 14 , Figure 16 as well as Figure 17 As shown, the outer casing 710 can be disposed within the control compartment 120 and has a first outlet 712 connecting the connecting cavity 711 and the control compartment 120. That is, it can be understood that the inlet of the connecting cavity 711 of the outer casing 710 can be connected to the connecting port 140, so that the connecting cavity 711 can be connected to the pressure relief channel 130, and the first outlet 712 of the connecting cavity 711 of the outer casing 710 is connected to the control compartment 120. With this arrangement, the pressure relief channel 130 and the control compartment 120 can be connected through the connecting port 140 and the connecting cavity 711, so as to facilitate the subsequent airtightness test of the entire battery pack.

[0061] The stop portion 720 can be disposed inside and / or outside the connecting cavity 711. That is, it can be understood that the stop portion 720 can be disposed, for example, inside the connecting cavity 711, to change the flow direction of the material flowing through the connecting cavity 711 by stopping the material flowing through the connecting cavity 711, and / or to buffer and / or absorb energy from the material; or, the stop portion 720 can also be disposed, for example, outside the first outlet 712 of the connecting cavity 711, to change the flow direction of the material flowing through the first outlet 712 by stopping the material flowing through the first outlet 712, and / or to buffer and / or absorb energy from the material. This disclosure does not specifically limit such modifications, and those skilled in the art can design them adaptively according to actual application needs.

[0062] Additionally, it should be noted that the specific embodiment in which the outer casing 710 is disposed within the control chamber 120 is exemplary. That is, when the outer casing 710 is disposed, for example, within the pressure relief channel 130, since the inlet of the connecting cavity 711 of the outer casing 710 is adaptively connected to the pressure relief channel 130, the outlet of the connecting cavity 711 of the outer casing 710 is adaptively connected to the connecting port 140. In this case, the stop portion 720 being disposed outside the connecting cavity 711 can be understood as follows: by disposing of the stop portion 720 outside, for example, the inlet connected to the pressure relief channel 130, the flow direction of the substance flowing through the inlet is changed by stopping the substance in the entry path of the inlet through the stop portion 720, and / or the substance is buffered and / or absorbed before entering the connecting cavity 711 through the inlet. This disclosure is not limited thereto.

[0063] The flow path of the aforementioned substance may include the inlet path, the flow path of the connecting cavity 711, and the discharge path of the first outlet 712.

[0064] In addition, in some embodiments, the position of the first outlet 712 can be configured such that the discharge path of the connection port 140 avoids at least part of the electrical components 3, thereby protecting the electrical components 3, reducing the risk of short circuits caused by, for example, high-temperature and high-pressure gas entering the control chamber 120, and improving the safety of the battery pack.

[0065] Furthermore, in some embodiments, the number of first outlets 712 can be one or more. This disclosure does not specifically limit this. Those skilled in the art can design it adaptively according to actual application needs. When the number of first outlets 712 is arranged as multiple, for example, the arrangement position of each first outlet 712 can be configured to avoid at least some electrical components 3, thereby reducing the risk of short circuits caused by high-temperature and high-pressure gas entering the control chamber 120 and improving the safety of the battery pack.

[0066] Exemplarily, in some implementations, reference is made to Figure 7 and Figure 8 As shown, the outer casing 710 may include, for example, a top plate 713 opposite to the communication port 140 and a side plate 714 surrounding the top plate 713 and the communication port 140. A first outlet 712 is formed on the side plate 714. With this arrangement, the top plate 713 can change the flow direction of the material flowing through the communication port 140, while also absorbing some of the impact force of the material. This can buffer and absorb the energy of the material flowing through the communication port 140 (such as high-temperature and high-pressure gas during thermal runaway), reduce the risk of short circuits caused by high-temperature and high-pressure gas entering the control chamber 120, improve the safety of the battery pack, and the overall structure is relatively simple, which helps to meet the overall lightweight design of the battery pack.

[0067] Alternatively, in some implementations, reference is made to Figure 7 As shown, the stop part 720 may include a first baffle 721 disposed in the connecting cavity 711. With this arrangement, the flow direction of the material can be changed by the first baffle 721 disposed on the flow path of the material, and at the same time, it can absorb part of the impact force of the material. This can buffer and absorb energy from the material flowing through the connecting port 140 (such as high temperature and high pressure gas during thermal runaway). The overall structure is relatively simple and can improve the safety of the battery pack.

[0068] And, as Figure 7 As shown, when the blocking structure 7 and the corresponding connecting port 140 are set on the frame 170 of the battery pack, the side of the first baffle 721 facing the connecting port 140 can form a collection groove 722. With this arrangement, the first baffle 721 can change the direction of material flow and absorb some of the impact force of the material, while also stopping and collecting metal particles (due to the influence of the processing technology of the frame 170, metal particles are easily present in the cavity 171 of the frame 170) into the collection groove 722, reducing the risk of short circuit caused by metal particles entering the control chamber 120 and improving the safety of the battery pack.

[0069] Of course, the specific embodiment in which the aforementioned stop 720 may include a first baffle 721 disposed within the communicating cavity 711 is exemplary. In other alternative embodiments, refer to... Figure 5 , Figure 9 as well as Figure 10 As shown, the stop portion 720 may also include a filling structure 723 disposed within the communicating cavity 711, and the filling structure 723 may have a gap connecting the pressure relief channel 130 and the control compartment 120. This arrangement allows the gap to connect the pressure relief channel 130 and the control compartment 120 to meet requirements such as airtightness testing, while also preventing at least some metal particles from entering the control compartment 120 and causing a short circuit, thereby improving the safety of the battery pack.

[0070] Among them, such as Figure 9 and Figure 10 As shown, the filling structure 723 may include foam 7231, for example, foam 7231 may include melamine foam. In this way, the foam 7231 is installed and fixed by interference fit with the communicating cavity 711 of the outer shell 710. Thus, during, for example, air tightness testing, the flow of gas at normal temperature and pressure can be achieved through the hole structure (gap) on the foam 7231, which meets the requirements of air tightness testing. Since the inner diameter of the hole structure (gap) on the foam 7231 is small, it can prevent at least some metal particles from entering the control compartment 120 through the foam 7231, thereby reducing the risk of short circuit caused by metal particles entering the control compartment 120 and improving the safety of the battery pack.

[0071] Furthermore, since melamine foam can absorb heat and melt during thermal runaway, it can reduce the temperature of the high-temperature and high-pressure gas generated by thermal runaway, and also diffuse the cooled gas into the control chamber 120. This reduces the local pressure of the gas and the possibility of battery pack deformation, abnormal noise, rupture, or explosion. When the gas diffuses in a large space, it will exchange heat with the surrounding environment. The environment of a large space is usually relatively low. After the gas diffuses in it, it can easily dissipate heat, thereby reducing the temperature of the gas. The lower gas temperature helps to slow down the further reaction and expansion of the gas, reduce the risk of heat spread within the battery pack, and help improve the safety of the entire battery pack.

[0072] Additionally, in some implementations, references Figure 11 and Figure 12 As shown, foam 7231 can be connected to housing 1 (e.g., base plate assembly 160 or frame 170) by adhesive 7232 (e.g., double-sided tape), and adhesive 7232 can be arranged around the connection port 140 to improve the reliability of the connection between foam 7231 and housing 1, reduce the risk of short circuit caused by high pressure gas blowing foam 7231 into control compartment 120 through the gap at the deformation point, and improve the safety of battery pack.

[0073] Furthermore, in some implementations, references Figure 11 and Figure 12 As shown, the foam 7231 may also be provided with a thinning groove 7233 that is recessed in the extension direction of the connecting cavity 711, so that, for example, thermal runaway gas or airtightness test gas can be discharged through the foam 7231 to the control chamber 120, thereby reducing the possibility of air entrapment and blockage at the foam 7231.

[0074] Alternatively, in some other alternative implementations, refer to Figure 15 and Figure 16As shown, the stop portion 720 may also include multiple second baffles 724 disposed within the connecting cavity 711, with the multiple second baffles 724 arranged sequentially along the flow path; wherein, the second baffles 724 are provided with through holes 7241 for material to flow through, and the through holes 7241 on two adjacent second baffles 724 are staggered in the direction perpendicular to the flow path. With this arrangement, the flow direction of the material can be changed by setting the aforementioned second baffles 724 in the flow path of the material, while also absorbing some of the impact force of the material, so as to achieve buffering and energy absorption of the material (such as high-temperature and high-pressure gas during thermal runaway) flowing through the connecting port 140. The overall structure arrangement is relatively simple and can improve the safety of the battery pack.

[0075] Additionally, by way of example, refer to Figure 15 and Figure 16 As shown, any two adjacent second baffles 724 can also be staggered in the direction perpendicular to the flow path to form a bent flow channel, so as to change the flow direction of the material and absorb part of the impact force of the material, so as to buffer and absorb energy of the material flowing through the connecting port 140 (such as high temperature and high pressure gas during thermal runaway). It should be noted that the above-mentioned multiple second baffles 724 are in the form of, for example, bent flow channels and through holes 7241 can be provided on the second baffles 724. They can be arranged simultaneously or separately. This disclosure does not specifically limit such modifications. Those skilled in the art can adaptively design the arrangement of the second baffles 724 according to actual application needs.

[0076] Furthermore, considering that in order to facilitate the assembly and disassembly of the housing 710 and to facilitate the adjustment of the outlet height and discharge orientation of, for example, the first outlet 712 of the housing 710, in some embodiments, reference is made to... Figure 16 As shown, taking the housing 710 installed inside the control chamber 120 as an example, the housing 710 can be connected to the communication port 140 through the first cylindrical section 730 and to the control chamber 120 through the second cylindrical section 740. The first cylindrical section 730 includes the inlet of the communication cavity 711 of the housing 710, and the second cylindrical section 740 includes the first outlet 712 of the housing 710. With this arrangement, the outlet height and discharge direction of the first outlet 712 of the housing 710 can be adjusted by adaptively designing the length and shape of the first cylindrical section 730 and the second cylindrical section 740. The overall structure is simple and easy to install and manufacture.

[0077] It should be noted that the first cylindrical section 730 and the second cylindrical section 740 can be adaptively constructed as, for example, a straight cylindrical structure, an inclined cylindrical structure, or an L-shaped cylindrical shape. This disclosure does not specifically limit such deformation methods, and those skilled in the art can design them adaptively according to actual application needs.

[0078] Alternatively, in some other alternative implementations, refer to Figure 13 , Figure 14 as well as Figure 17 As shown, the stop portion 720 may also include a funnel structure 725 disposed in the connecting cavity 711. The inner diameter of the funnel structure 725 gradually decreases along the flow path of the material toward the control chamber 120. This arrangement can meet the requirements of airtightness testing, while also changing the direction of material flow and absorbing some of the impact force of the material. This can buffer and absorb energy from the material flowing through the connecting port 140 (such as high-temperature and high-pressure gas during thermal runaway), and reduce the risk of short circuit caused by metal particles entering the control chamber 120. The overall structure is relatively simple and can improve the safety of the battery pack.

[0079] Additionally, in some implementations, references Figure 18 As shown, solid particles 750 can be disposed on the inner wall surface of the outer casing 710. The solid particles 750 are configured to be detachably connected to the inner wall surface of the outer casing 710 so that when the solid particles 750 detach from the outer casing 710, they can block the second outlet of the funnel structure 725. This arrangement not only allows the solid particles 750 to change the direction of material flow and absorb part of the impact force of the material, but also allows the solid particles 750 to block the second outlet of the funnel structure 725 after thermal runaway, thereby cutting off the connection between the pressure relief channel 130 and the control chamber 120. This reduces the risk of high-temperature and high-pressure gas entering the control chamber 120 after thermal runaway and causing a short circuit to the electrical components 3, thereby improving the safety of the battery pack.

[0080] For example, the solid particles 750 can be adhered to the inner wall of the housing 710 for easy installation. The adhesion force between the solid particles 750 and the inner wall of the housing 710 can be configured to be greater than the air pressure inside the battery pack during the airtightness test, and less than the air pressure inside the battery pack during thermal runaway. With this arrangement, for example, during the airtightness test, since the adhesion force between the solid particles 750 and the inner wall of the housing 710 is greater than the air pressure inside the battery pack during the airtightness test, the solid particles 750 will not detach from the housing 710. This allows the gas during the airtightness test to be discharged through the second outlet of the funnel structure 725 into, for example, the control chamber 120, thus meeting the airtightness test requirements. In the event of thermal runaway, for example, because the adhesion between the solid particles 750 and the inner wall of the outer casing 710 is less than the gas pressure inside the battery pack during thermal runaway, the solid particles 750 will detach from the outer casing 710. During thermal runaway, the solid particles 750 can be blown towards the second outlet of the funnel structure 725 under the action of high pressure in the pressure relief channel 130. Under the action of high pressure, the solid particles 750 can block the second outlet of the funnel structure 725, thereby cutting off the connection between the pressure relief channel 130 and the control chamber 120 during thermal runaway. This reduces the risk of high-temperature and high-pressure gas entering the control chamber 120 after thermal runaway and causing a short circuit to the electrical components 3, thus improving the safety of the battery pack.

[0081] It should be noted that the air pressure inside the battery pack during the above-mentioned airtightness test can be, for example, 3.5 kPa-5 kPa, and the air pressure inside the battery pack during thermal runaway can be greater than 7 kPa. This disclosure is not limited to this.

[0082] Furthermore, the conditions for the separation of the solid particles 750 from the inner wall of the outer shell 710 are not limited to blowing off the solid particles 750 by air pressure. In some alternative embodiments, the solid particles 750 can also be detached from the outer shell 710 by means of, for example, high temperature. For example, during thermal runaway, the high temperature and high pressure gas will come into contact with the connection between the solid particles 750 and the outer shell 710. In this way, the solid particles 750 can be detached from the outer shell 710 under the action of the high temperature and high pressure gas. This disclosure does not specifically limit such variations. Those skilled in the art can design them adaptively according to actual application needs.

[0083] In addition, in some embodiments, the maximum outer diameter of the solid particle 750 may be greater than the inner diameter of the second outlet of the funnel structure 725, so as to seal the second outlet of the funnel structure 725 with the solid particle 750.

[0084] It should be noted that when there are multiple connecting ports 140, the blocking structures 7 set on the material flow path of the corresponding connecting ports 140 can be arranged in the same way as the multiple specific embodiments of the blocking structures 7 described above. That is, it can be understood that the multiple blocking structures 7 are all adaptively designed and arranged in the same way as the multiple specific embodiments of the blocking structures 7 described above. Alternatively, the multiple blocking structures 7 can be arranged in different ways. That is, it can be understood that any one of the multiple blocking structures 7 can be adaptively designed according to the corresponding arrangement position and application requirements. This disclosure does not specifically limit such modifications. Those skilled in the art can design them adaptively according to actual application requirements.

[0085] Alternatively, in some implementations, reference is made to Figures 7 to 18 As shown, a thermally decomposable solid layer 8 may be provided on the wall surface of at least one of the outer casing 710 and the stop portion 720. The thermally decomposable solid layer 8 is capable of absorbing heat and decomposing. For example, the material of the thermally decomposable solid layer 8 may include at least one of calcium carbonate, magnesium carbonate, and zinc carbonate. This arrangement allows the thermally decomposable solid layer 8 to absorb the temperature inside the battery pack during thermal runaway, while the blocking structure 7 can also change the flow direction of the material and / or buffer and / or absorb energy from the material. This reduces the risk of short circuits caused by high-temperature and high-pressure gases entering the control chamber 120, thereby improving the safety of the battery pack.

[0086] It should be noted that the design position of the above-mentioned thermal decomposition solid layer 8 is not limited to the outer shell 710 and / or the stop portion 720. Those skilled in the art can also adapt the specific arrangement position of the thermal decomposition solid layer 8 according to the actual application requirements. For example, it can also be set on the pressure relief channel 130 and / or the frame 170. This disclosure is not limited thereto.

[0087] According to a second aspect of this disclosure, an electrical appliance is provided, which includes the battery pack provided in the first aspect. Furthermore, the electrical appliance possesses all the beneficial effects of the battery pack provided in the first aspect, which will not be elaborated further herein.

[0088] In some exemplary application scenarios, the aforementioned electrical equipment can be a vehicle, wherein the vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc., and this disclosure does not make any specific limitations in this regard.

[0089] Of course, in other application scenarios, the above-mentioned electrical equipment can also be used for vehicles that need to be powered by battery packs, such as in the field of energy storage, aerospace or water transportation.

[0090] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0091] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0092] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A battery pack, characterized by, The device includes a housing, which has a battery compartment for accommodating individual battery cells, a control compartment for accommodating electrical components, and a pressure relief channel communicating with a pressure relief component of the individual battery cells. The housing is provided with a communication port communicating with the pressure relief channel and the control compartment.

2. The battery pack of claim 1, wherein, The location of the connection port is configured such that the discharge path of the connection port avoids at least part of the electrical components.

3. The battery pack of claim 1, wherein, The position of the connection port is configured such that the minimum distance between the connection port and the outer bottom surface of the housing in the height direction of the battery pack is greater than or equal to a first preset distance.

4. The battery pack of claim 3, wherein, The first preset distance is not less than the distance between the top surface of the battery cell and the bottom surface of the casing.

5. The battery pack of claim 1, wherein, The housing includes a base plate assembly and a frame, the frame being arranged circumferentially around the base plate assembly; At least one of the base plate assembly and the frame is provided with at least a portion of the pressure relief channel, and at least one of the base plate assembly and the frame is provided with the communication port.

6. The battery pack of claim 5, wherein, The battery pack also includes a top cover, the top cover, the frame and the bottom plate assembly forming an accommodating space, and the battery compartment and the control compartment are located in the accommodating space; or, The battery pack also includes a top cover and a maintenance cover. The top cover, the frame, and the bottom plate assembly form an accommodating space. The battery compartment is located in the accommodating space. The maintenance cover is located on the side of the top cover away from the accommodating space. The control compartment is located between the maintenance cover and the top cover. The frame is provided with the communication port.

7. The battery pack of claim 5, wherein, The base plate assembly includes a first plate and a second plate. The first plate supports the battery cell, and at least a portion of the pressure relief channel is formed between the first plate and the second plate. The first plate has the communication port. And / or... The frame has a cavity forming at least part of the pressure relief channel, and the communication port is provided on the inner wall or top wall of the frame.

8. The battery pack of claim 5, wherein, The connecting opening is provided on the inner wall of the frame, and the connecting opening is arranged adjacent to the top wall of the frame.

9. The battery pack of any one of claims 1-8, wherein, The battery pack further includes a blocking structure, which is provided on the flow path of at least one of the communication ports through which the material flows, so as to change the flow direction of the material and / or buffer and / or absorb energy from the material.

10. The battery pack of claim 9, wherein, The blocking structure is disposed within the pressure relief channel and / or the control chamber.

11. The battery pack of claim 9, wherein, The blocking structure includes a housing and a stop portion. The housing has a communicating cavity that communicates with the communicating port. The stop portion is disposed inside and / or outside the communicating cavity.

12. The battery pack of claim 11, wherein, The outer shell is disposed within the control compartment and has a first outlet connecting the connecting cavity and the control compartment; The first outlet is positioned such that the discharge path of the connection port avoids at least a portion of the electrical components.

13. The battery pack of claim 12, wherein, The housing includes a top plate and side plates surrounding the top plate and the communication opening, with the first outlet formed on the side plates.

14. The battery pack of claim 13, wherein, The stop portion includes a first baffle disposed within the communicating cavity; When the blocking structure and the corresponding connecting port are disposed on the frame of the battery pack, the first baffle forms a collection groove on the side facing the connecting port.

15. The battery pack of claim 11, wherein, The stop portion includes a filling structure disposed within the communicating cavity, the filling structure having a gap connecting the pressure relief channel and the control chamber.

16. The battery pack of claim 15, wherein, The filling structure includes foam; Wherein, the foam is connected to the housing by adhesive members, the adhesive members being arranged around the communication opening; and / or, The foam is provided with a thinning groove that is recessed inward along the extension direction of the communicating cavity.

17. The battery pack of claim 16, wherein, The foam is melamine foam.

18. The battery pack of claim 11, wherein, The stop portion includes multiple second baffles disposed within the communicating cavity, the multiple second baffles being arranged sequentially along the flow path; The second baffle is provided with through holes for the material to flow through, and the through holes on adjacent second baffles are staggered in a direction perpendicular to the flow path; and / or, Any two adjacent second baffles are staggered in a direction perpendicular to the flow path to form a bend-shaped flow channel.

19. The battery pack of claim 11, wherein, The outer shell is disposed inside the control compartment. The outer shell is connected to the communication port through a first cylindrical section and to the control compartment through a second cylindrical section.

20. The battery pack of claim 11, wherein, The stop portion includes a funnel structure disposed within the communicating cavity, the inner diameter of which gradually decreases along the flow path of the material toward the control chamber.

21. The battery pack of claim 20, wherein, Solid particles are disposed on the inner wall surface of the outer shell. The solid particles are configured to be detachably connected to the inner wall surface of the outer shell so that when the solid particles detach from the outer shell, they can block the second outlet of the funnel structure.

22. The battery pack of claim 21, wherein, The solid particles adhere to the inner wall surface of the outer shell; and / or, The maximum outer diameter of the solid particles is greater than the inner diameter of the second outlet of the funnel structure.

23. The battery pack of claim 11, wherein, A thermally decomposable solid layer is provided on the wall surface of at least one of the outer shell and the stop portion, wherein the thermally decomposable solid layer is capable of absorbing heat and decomposing.

24. An electrical device, comprising: Includes the battery pack described in any one of claims 1-23.

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