Battery pack and electric device

Abstract

The embodiment of the utility model discloses a battery pack and a power utilization device, the battery pack comprises a box body, the box body comprises a bottom plate and an edge beam, the edge beam is arranged around the edge of the bottom plate, the bottom plate and the edge beam are matched to define a containing cavity, and an exhaust monitoring cavity is formed in the edge beam; the first battery assembly is arranged in the accommodating cavity, and the first battery assembly comprises a first exhaust part and a first single battery; the second battery assembly is arranged in the accommodating cavity, and the second battery assembly comprises a second exhaust part and a second single battery; and the pressure-sensitive element is arranged on the edge beam, the pressure-sensitive element is provided with a sensing end, at least part of the sensing end is arranged in the exhaust monitoring cavity, and the pressure-sensitive element is used for monitoring the air pressure in the exhaust monitoring cavity. According to the application, the pressure-sensitive element is utilized to monitor the air pressure change value in the exhaust monitoring cavity so as to judge the danger level of the battery pack, so that the safety early warning is given out, the thermal runaway problem of the battery pack is correspondingly and actively controlled, and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] The replacement of traditional fuel vehicles with new energy vehicles is crucial for addressing energy and pollution challenges facing the global transportation industry and represents an inevitable trend. With the rapid development of the new energy industry, battery packs with high capacity, long cycle life, and superior safety performance have gained widespread application and development. Simultaneously, there is an urgent need for battery packs with greater capacity, greater durability, and improved safety. Safety is a core performance characteristic of batteries, so improving the safety of battery packs has become a pressing issue. Utility Model Content

[0003] Embodiments of the present application provide a battery pack and an electrical device to improve the safety performance of the battery pack.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a battery pack is provided, comprising: a box body, the box body comprising: a bottom plate and side beams, the side beams being arranged around the edge of the bottom plate, and the bottom plate and the side beams cooperate to enclose a receiving cavity, and an exhaust monitoring cavity is defined in the side beams;

[0006] A first battery assembly is disposed in the accommodating cavity, and the first battery assembly includes: a first exhaust member and a first single battery, the first exhaust member is connected to the side beam, the first single battery is disposed on a side of the first exhaust member away from the bottom plate, a first pressure relief portion is provided on a side of the first single battery facing the first exhaust member, a first exhaust cavity is defined in the first exhaust member, the first pressure relief portion is used to communicate with the first exhaust cavity, and the first exhaust cavity is communicated with the exhaust monitoring cavity;

[0007] a second battery assembly disposed in the accommodating cavity, and comprising: a second exhaust member and a second single battery, the second exhaust member being connected to the side beam and disposed away from the bottom plate relative to the first exhaust member, the second single battery being disposed on a side of the second exhaust member away from the bottom plate, a second pressure relief portion being disposed on a side of the second single battery facing the second exhaust member, a second exhaust cavity being defined within the second exhaust member, the second pressure relief portion being configured to communicate with the second exhaust cavity, and the second exhaust cavity being in communication with the exhaust monitoring cavity; and

[0008] The pressure sensitive element is arranged on the side beam and has a sensing end, at least part of which is arranged in the exhaust monitoring cavity. The pressure sensitive element is used to monitor the air pressure in the exhaust monitoring cavity.

[0009] In addition to or as an alternative to one or more of the features disclosed above, a first exhaust channel and a second exhaust channel are opened in the side beam, and the first exhaust channel and the second exhaust channel are separately arranged;

[0010] The first exhaust chamber is communicated with the exhaust monitoring chamber through the first exhaust channel, and the second exhaust chamber is communicated with the exhaust monitoring chamber through the second exhaust channel.

[0011] In addition to or as an alternative to one or more features disclosed above, the battery pack has a first direction and a second direction intersecting each other;

[0012] The side beam includes: a first beam and a second beam connected to each other, the first beam extends along a first direction, and the second beam extends along a second direction;

[0013] A first sub-exhaust channel and a second sub-exhaust channel are opened in the first beam, a third sub-exhaust channel and a fourth sub-exhaust channel are opened in the second beam, an exhaust monitoring cavity is located in the second beam, and the third sub-exhaust channel and the fourth sub-exhaust channel are both connected to the exhaust monitoring cavity;

[0014] The first sub-exhaust channel is communicated with the third sub-exhaust channel to form a first exhaust channel, and the second sub-exhaust channel is communicated with the fourth sub-exhaust channel to form a second exhaust channel.

[0015] In addition to or as an alternative to one or more of the features disclosed above, the second beam includes: a main body portion, the main body portion is provided with an opening, the opening being in communication with the exhaust monitoring cavity; and

[0016] The sealing part is sealed on the open opening, and a monitoring port is opened on the sealing part, and the pressure sensitive element is sealed on the monitoring port.

[0017] In addition to or as an alternative to one or more of the features disclosed above, the first beam is provided with a first exhaust port and a second exhaust port spaced apart from each other, the first exhaust port being in communication with the first sub-exhaust channel, and the second exhaust port being in communication with the second sub-exhaust channel;

[0018] The battery pack further includes: a first explosion-proof valve and a second explosion-proof valve, the first explosion-proof valve is sealed on the first exhaust port, and the second explosion-proof valve is sealed on the second exhaust port.

[0019] In addition to or as an alternative to one or more of the features disclosed above, the first exhaust member is provided with a first absorption hole, the first absorption hole is communicated with the first exhaust cavity, and the first absorption hole is arranged opposite to the first pressure relief portion;

[0020] A second absorbing hole is provided on the second exhaust member. The second absorbing hole is communicated with the second exhaust cavity, and the second absorbing hole is arranged opposite to the second pressure relief portion.

[0021] In addition to or as an alternative to one or more of the features disclosed above, the side beam further comprises: a third beam and a fourth beam connected to each other, the third beam extending along the first direction, and the third beam and the first beam being spaced apart in the second direction, the fourth beam extending along the second direction, and the fourth beam and the second beam being spaced apart in the first direction;

[0022] The box body also includes: multiple first support parts and multiple second support parts, one first support part is protruding and connected to the side of the first beam close to the accommodating cavity, another first support part is protruding and connected to the side of the third beam close to the accommodating cavity, one second support part is connected to the side of the first beam close to the accommodating cavity, another second support part is connected to the side of the third beam close to the accommodating cavity, and the first support part is arranged close to the bottom plate relative to the second support part, the first exhaust part is connected to the first support part, and the second exhaust part is connected to the second support part.

[0023] In addition to or as an alternative to one or more features disclosed above, the maximum dimension of the first support portion in the second direction is H1 mm, and the maximum dimension of the second support portion in the second direction is H2 mm, satisfying: H1>H2.

[0024] In addition to or as an alternative to one or more of the features disclosed above, the first vent member has a first lifting ring portion, and the first lifting ring portion is used to load the first battery assembly into the accommodating cavity;

[0025] The second exhaust member has a second hanging ring portion, and the second hanging ring portion is used to load the second battery assembly into the accommodating cavity.

[0026] On the other hand, an electrical device is further disclosed. In addition to or instead of one or more of the features disclosed above, the electrical device includes a battery pack as described in any one of the above items, and the battery pack serves as a power supply for the electrical device.

[0027] One of the above technical solutions has the following advantages or beneficial effects: the present application opens an exhaust monitoring cavity in the side beam, connects the exhaust monitoring cavity with the first exhaust cavity of the first exhaust member and the second exhaust cavity of the second exhaust, respectively, and monitors the air pressure in the exhaust monitoring cavity by setting a pressure sensitive element, so that when a first single cell and a second single cell of the battery pack undergo thermal runaway, the pressure sensitive element with high sensitivity is used to timely monitor the pressure change value in the exhaust monitoring cavity and then judge the danger level of the battery pack to issue a safety warning, that is, to issue a corresponding early warning before the battery pack undergoes overall thermal runaway, thereby improving the safety performance of the battery pack; at the same time, the present application reduces production costs by setting a single pressure sensitive element to monitor the thermal runaway of multiple battery components. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0029] Figure 1 is an exploded structural view of a battery pack provided according to an embodiment of the present application;

[0030] Figure 2 is a top view of a battery pack provided according to an embodiment of the present application;

[0031] Figure 3 is a cross-sectional view of a battery pack along the AA direction according to an embodiment of the present application;

[0032] Figure 4 is a three-dimensional structural diagram of a box provided according to an embodiment of the present application;

[0033] Figure 5 is a three-dimensional structural diagram of a box from another perspective according to an embodiment of the present application;

[0034] Figure 6 is a top view of a box provided according to an embodiment of the present application;

[0035] Figure 7 is a cross-sectional view of the box along the BB direction provided by an embodiment of the present application;

[0036] Figure 8 is a cross-sectional view of a box along the CC direction provided by an embodiment of the present application;

[0037] Figure 9 is a cross-sectional view of a box along the DD direction provided by an embodiment of the present application;

[0038] Figure 10 is a three-dimensional structural diagram of a first beam and a second beam provided according to an embodiment of the present application;

[0039] Figure 11 yes Figure 10 A partial enlarged view of point E in the middle;

[0040] Figure 12 is a three-dimensional structural diagram of a first beam, a first battery assembly, and a second battery assembly provided according to an embodiment of the present application;

[0041] Figure 13 is a partial cross-sectional view of a first battery assembly provided according to an embodiment of the present application;

[0042] Figure 14 yes Figure 13 A partial enlarged view of point F in the middle;

[0043] Figure 15is a partial cross-sectional view of a second battery assembly provided according to an embodiment of the present application;

[0044] Figure 16 yes Figure 15 A partial enlarged view of point G in the middle.

[0045] Description of reference numerals:

[0046] 100. Battery pack;

[0047] 110. Box body; 111. Bottom plate; 112. Side beam; 1121. First beam; 11211. First exhaust port; 11212. Second exhaust port; 1122. Second beam; 11221. Main body; 11222. Sealing portion; 11223. Exhaust monitoring chamber; 11224. Opening; 11225. Monitoring port; 1123. Third beam; 1124. Fourth beam; 1125. First exhaust channel; 11251. First sub-exhaust channel; 11252. Third sub-exhaust channel; 1126. Second exhaust channel; 11261. Second sub-exhaust channel; 11262. Fourth sub-exhaust channel; 113. Accommodating chamber; 114. First support portion; 115. Second support portion;

[0048] 120, first battery assembly; 121, first exhaust member; 1211, first exhaust cavity; 1212, first absorption hole; 1213, first hanging ring; 122, first single battery; 1221, first pressure relief portion;

[0049] 130, second battery assembly; 131, second exhaust member; 1311, second exhaust cavity; 1312, second absorption hole; 1313, second hanging ring; 132, second single battery; 1321, second pressure relief portion;

[0050] 140. Pressure sensitive element; 141. Sensing end;

[0051] 150, first explosion-proof valve;

[0052] 160, second explosion-proof valve;

[0053] 170. Box lid. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and beneficial effects of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for the purpose of explaining this application and are not intended to limit this application.

[0055] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] With the continuous development of new energy vehicles, battery packs are widely used as the power source of these vehicles. Battery pack safety performance is becoming increasingly important, especially thermal runaway safety, which is a key indicator of battery quality. Thermal runaway control in battery packs can be implemented from two perspectives: passive safety and active safety. Thermal runaway issues in battery packs can only be controlled through passive safety measures, resulting in poor handling of thermal runaway issues and poor battery pack safety performance.

[0059] In order to solve the above problems, in the embodiments of the present application, referring to Figures 1 to 16 The present application provides a battery pack 100 having a first direction X, a second direction Y, and a third direction Z that intersect each other. Exemplarily, the battery pack 100 has the first direction X, the second direction Y, and the third direction Z that are perpendicular to each other. "Perpendicular" refers to a state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°.

[0060] Specifically, the battery pack 100 includes a box body 110 , a first battery assembly 120 , a second battery assembly 130 , a pressure-sensitive element 140 and a box cover 170 .

[0061] Specifically, the box body 110 includes: a bottom plate 111 and a side beam 112, the side beam 112 is arranged around the edge of the bottom plate 111, and the bottom plate 111 and the side beam 112 cooperate to enclose a receiving cavity 113, and an exhaust monitoring cavity 11223 is opened in the side beam 112; the first battery assembly 120 is arranged in the receiving cavity 113, and the first battery assembly 120 includes: a first exhaust member 121 and a first single battery 122, the first exhaust member 121 is connected to the side beam 112, and the first single battery 122 A first pressure relief portion 1221 is provided on a side of the first exhaust member 121 away from the bottom plate 111, and a first pressure relief portion 1221 is provided on a side of the first single battery 122 facing the first exhaust member 121. A first exhaust cavity 1211 is provided in the first exhaust member 121, and the first pressure relief portion 1221 is used to communicate with the first exhaust cavity 1211, and the first exhaust cavity 1211 is communicated with the exhaust monitoring cavity 11223; the second battery assembly 130 is provided in the accommodating cavity 113, and the second battery assembly 130 includes: a second exhaust member 131 and a second single battery 132, the second exhaust member 131 is connected to the side beam 112, and the second exhaust member 131 is arranged away from the bottom plate 111 relative to the first exhaust member 121, the second single battery 132 is arranged on the side of the second exhaust member 131 away from the bottom plate 111, and the second single battery 132 is provided with a second pressure relief portion 1321 on the side facing the second exhaust member 131, and a second exhaust cavity 1311 is opened in the second exhaust member 131, and the second pressure relief portion 1321 is used to connect the second exhaust member 131 to the second exhaust member 131. The air cavity 1311, and the second exhaust cavity 1311 is connected to the exhaust monitoring cavity 11223; the pressure sensitive element 140 is arranged on the side beam 112, and the pressure sensitive element 140 has a sensing end 141, at least part of the sensing end 141 is arranged in the exhaust monitoring cavity 11223, and the pressure sensitive element 140 is used to monitor the air pressure in the exhaust monitoring cavity 11223, so as to judge the danger level of the battery pack 100 according to the air pressure change value in the exhaust monitoring cavity 11223; the box cover 170 is connected to the box body 110.

[0062] The battery pack 100 may comprise a three-layer structure consisting of a single cell, a battery module, and a battery pack. Specifically, the first single cell 122 and the second single cell 132 are grouped into a battery module, which is then placed within the housing 110 to form the battery pack 100. Alternatively, the battery pack 100 may comprise a two-layer structure consisting of a single cell and a battery pack. Specifically, the first single cell 122 and the second single cell 132 are placed directly within the housing 110 to form the battery pack. This is not specifically limited in this application and may be configured based on actual circumstances, as long as it does not affect the effectiveness of this application.

[0063] The bottom plate 111 and the side beams 112 are both made of ordinary steel or aluminum, but are not limited thereto.

[0064] The box cover 170 is made of metal, but is not limited thereto.

[0065] The bottom plate 111 and the side beams 112 can be integrally formed, that is, the bottom plate 111 and the side beams 112 are an integral structure. For example, the bottom plate 111 and the side beams 112 are integrally die-cast. The bottom plate 111 and the side beams 112 can also be separately provided and fixedly connected. For example, the side beams 112 are fixedly connected to the bottom plate 111 by a welding process. This is not specifically limited in this application and can be specifically set according to actual circumstances. For example, in this application, the bottom plate 111 and the side beams 112 are welded and fixed to ensure the sealing of the box body 110.

[0066] The first cell 122 and the second cell 132 may both be secondary batteries. A secondary battery is a battery that can be recharged to activate its active material after discharge for continued use. For example, the first cell 122 and the second cell 132 may be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, or nickel-cadmium batteries.

[0067] The first battery cell 122 and the second battery cell 132 may be prismatic batteries, soft-pack batteries, or batteries of other shapes. For example, in the present application, the first battery cell 122 and the second battery cell 132 are cylindrical batteries.

[0068] The first and second cells 122 and 132 each include an electrode assembly, an electrolyte, a housing, an end cap, a terminal post, and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with additives. The electrolyte is used to impregnate the electrode assembly. The electrode assembly is the component where the electrochemical reaction occurs in the first and second cells 122 and 132, and there can be one or more electrode assemblies. The electrode assembly is primarily formed by stacking or winding a positive electrode sheet, a separator, and a negative electrode sheet. The portions of the positive and negative electrode sheets containing active material constitute the electrode body, while the portions of the positive and negative electrode sheets without active material each constitute the tab. During the charge and discharge process of the first and second cells 122 and 132, the positive and negative active materials react with the electrolyte, electrically connecting the tab and the terminal post to form a current circuit, enabling normal operation of the first and second cells 122 and 132.

[0069] Among them, the first pressure relief portion 1221 can be formed by directly opening an explosion-proof line on the shell of the first single battery 122, or by directly installing an explosion-proof valve on the shell of the first single battery 122. This is not specifically limited in this application and can be specifically set according to actual circumstances.

[0070] The second pressure relief portion 1321 may be formed by directly opening an explosion-proof scoreline on the shell of the second single battery 132 , or may be formed by directly installing an explosion-proof valve on the shell of the second single battery 132 . This is not specifically limited in the present application and may be specifically configured according to actual circumstances.

[0071] The pressure sensitive element 140 may be a pressure sensor, but is not limited thereto.

[0072] It can be understood that when a first single cell 122 in the battery pack 100 experiences thermal runaway, the generated high-temperature and high-pressure gas is discharged to the first exhaust chamber 1211 and the exhaust monitoring chamber 11223. The pressure sensitive element 140 detects that the air pressure in the exhaust monitoring chamber 11223 has changed, and thus the danger level of the battery pack 100 is judged according to the air pressure change value in the gas monitoring chamber 11223 to issue a safety warning. That is to say, a corresponding early warning is issued before the battery pack experiences overall thermal runaway, thereby improving the safety performance of the battery pack and performing corresponding active control of the battery pack 100.

[0073] When the second single cell 132 in the battery pack 100 experiences thermal runaway, the generated high-temperature and high-pressure gas is discharged into the second exhaust chamber 1311 and the exhaust monitoring chamber 11223. The pressure-sensitive element 140 detects that the air pressure in the exhaust monitoring chamber 11223 has changed, and thus judges the danger level of the battery pack 100 based on the air pressure change value in the gas monitoring chamber 11223 to issue a safety warning. That is to say, a corresponding early warning is issued before the battery pack experiences overall thermal runaway, thereby improving the safety performance of the battery pack and performing corresponding active control of the battery pack 100.

[0074] The present application provides an exhaust monitoring chamber 11223 in the side beam 112, connects the exhaust monitoring chamber 11223 with the first exhaust chamber 1211 of the first exhaust member 121 and the second exhaust chamber 1311 of the second exhaust member 131 respectively, and sets a pressure sensitive element 140 to monitor the air pressure in the exhaust monitoring chamber 11223, so that when the first single cell 122 and the second single cell 132 of the battery pack 100 undergo thermal runaway, the pressure sensitive element 140 is used to monitor the air pressure change value in the exhaust monitoring chamber 11223 to judge the danger level of the battery pack 100 and issue a safety warning, that is, a corresponding early warning is issued before the battery pack undergoes overall thermal runaway, thereby performing corresponding active control on the thermal runaway problem of the battery pack 100 and improving the safety performance of the battery pack 100; at the same time, the present application reduces production costs by setting a single pressure sensitive element 140 to monitor the thermal runaway of multiple battery components.

[0075] In one embodiment, the battery pack 100 further includes: a battery management element (not shown), which is disposed in the accommodating cavity 113 , and the pressure sensitive element 140 is electrically connected to the battery management element, and the battery management element is electrically connected to components outside the battery pack 100 .

[0076] When thermal runaway occurs in the first single cell 122 and / or the second single cell 132 in the battery pack 100, the pressure-sensitive element 140 detects a change in the air pressure in the exhaust monitoring chamber 11223, and the pressure-sensitive element 140 sends a sensing signal to the battery management element. After receiving the sensing signal, the battery management element determines the danger level of the battery pack 100 based on the sensing result, issues a safety warning, and thereby controls the battery pack 100 accordingly to ensure safe use of the battery pack 100.

[0077] In one embodiment, in order to optimize the overall exhaust structure of the battery pack 100, in this application, reference is made to Figures 3 to 8A first exhaust channel 1125 and a second exhaust channel 1126 are provided in the side beam 112, and the first exhaust channel 1125 and the second exhaust channel 1126 are separately arranged; the first exhaust cavity 1211 is connected to the exhaust monitoring cavity 11223 through the first exhaust channel 1125, and the second exhaust cavity 1311 is connected to the exhaust monitoring cavity 11223 through the second exhaust channel 1126.

[0078] It can be understood that when the first single cell 122 in the battery pack 100 experiences thermal runaway, the generated high-temperature and high-pressure gas is discharged into the first exhaust chamber 1211, then transported from the first exhaust chamber 1211 to the first exhaust channel 1125, and then transported from the first exhaust channel 1125 to the exhaust monitoring chamber 11223.

[0079] When the second single battery 132 in the battery pack 100 experiences thermal runaway, the generated high-temperature and high-pressure gas is discharged into the second exhaust chamber 1311 , then transported from the second exhaust chamber 1311 to the second exhaust channel 1126 , and then transported from the second exhaust channel 1126 to the exhaust monitoring chamber 11223 .

[0080] The present application opens a first exhaust channel 1125 and a second exhaust channel 1126 in the side beam 112, and the first exhaust cavity 1211 is connected to the exhaust monitoring cavity 11223 through the first exhaust channel 1125, and the second exhaust cavity 1311 is connected to the exhaust monitoring cavity 11223 through the second exhaust channel 1126, so as to ensure that when thermal runaway occurs in the first single cell 122 and the second single cell 132, the high-temperature and high-pressure gas generated is discharged in a direction from the first exhaust channel 1125 and the second exhaust channel 1126, so as to improve the safety performance of the battery pack 100. At the same time, the first exhaust channel 1125 and the second exhaust channel 1126 are opened inside the side beam 112, and there is no need to set up other additional exhaust components, which improves the space occupancy rate of the single cells in the battery pack 100 and ultimately improves the capacity of the battery pack 100.

[0081] In one embodiment, in order to further optimize the overall exhaust structure of the battery pack 100, in this application, reference is made to Figures 3 to 8 The side beam 112 includes: a first beam 1121 and a second beam 1122 connected to each other, the first beam 1121 extends along the first direction X, and the second beam 1122 extends along the second direction Y; a first sub-exhaust channel 11251 and a second sub-exhaust channel 11261 are opened in the first beam 1121, and a third sub-exhaust channel 11252 and a fourth sub-exhaust channel 11262 are opened in the second beam 1122, and the exhaust monitoring cavity 11223 is located in the second beam 1122, and the third sub-exhaust channel 11252 and the fourth sub-exhaust channel 11262 are both connected to the exhaust monitoring cavity 11223.

[0082] The first sub-exhaust channel 11251 is communicated with the third sub-exhaust channel 11252 to form a first exhaust channel 1125 , and the second sub-exhaust channel 11261 is communicated with the fourth sub-exhaust channel 11262 to form a second exhaust channel 1126 .

[0083] It can be understood that when the first single cell 122 in the battery pack 100 experiences thermal runaway, the high-temperature and high-pressure gas generated is discharged to the first exhaust chamber 1211, and then transported from the first exhaust chamber 1211 to the first sub-exhaust channel 11251 and the third sub-exhaust channel 11252, and then transported from the third sub-exhaust channel 11252 to the exhaust monitoring chamber 11223.

[0084] When the second single cell 132 in the battery pack 100 experiences thermal runaway, the generated high-temperature and high-pressure gas is discharged to the second exhaust chamber 1311, and then transported from the second exhaust chamber 1311 to the second sub-exhaust channel 11261 and the fourth sub-exhaust channel 11262, and then transported from the fourth sub-exhaust channel 11262 to the exhaust monitoring chamber 11223.

[0085] In the present application, a first sub-exhaust channel 11251 and a second sub-exhaust channel 11261 are opened in the first beam 1121, and a third sub-exhaust channel 11252 and a fourth sub-exhaust channel 11262 are opened in the second beam 1122, so as to ensure that the high-temperature and high-pressure gas generated when the first single battery 122 has thermal runaway is discharged from the first sub-exhaust channel 11251 and the third sub-exhaust channel 11252 in a directionally manner, and when the second single battery 132 has thermal runaway, the high-temperature and high-pressure gas generated is discharged from the second sub-exhaust channel 11261 and the fourth sub-exhaust channel 11262 in a directionally manner, so as to improve the safety performance of the battery pack 100.

[0086] In one embodiment, in order to facilitate the processing and forming of the box body 110, in this application, reference is made to Figure 10 The second beam 1122 includes: a main body 11221 and a sealing portion 11222; an opening 11224 is provided on the main body 11221, and the opening 11224 is connected to the exhaust monitoring chamber 11223; the sealing portion 11222 covers the opening 11224, and a monitoring port 11225 is provided on the sealing portion 11222, and the pressure sensitive element 140 covers the monitoring port 11225.

[0087] The present application provides an opening 11224 on the main body 11221 to facilitate the processing and forming of the exhaust monitoring cavity 11223, thereby improving the processing and forming efficiency of the box body 110; at the same time, the sealing part 11222 is sealed on the opening 11224, and the pressure sensitive element 140 is sealed on the monitoring port 11225 to ensure the overall sealing of the exhaust channel.

[0088] In one embodiment, referring to Figures 13 to 16A first absorption hole 1212 is provided on the first exhaust member 121, and the first absorption hole 1212 is communicated with the first exhaust chamber 1211, and the first absorption hole 1212 is arranged opposite to the first pressure relief portion 1221, that is, the first absorption hole 1212 is communicated with the first pressure relief portion 1221 to ensure that when the first single battery 122 has thermal runaway, the high-temperature and high-pressure gas released through the first pressure relief portion 1221 is transported to the first exhaust chamber 1211 by the first absorption hole 1212 to ensure that the high-temperature and high-pressure gas is discharged, thereby ensuring the safety performance of the battery pack 100.

[0089] A second absorption hole 1312 is provided on the second exhaust member 131, and the second absorption hole 1312 is connected to the second exhaust chamber 1311, and the second absorption hole 1312 is arranged opposite to the second pressure relief portion 1321, that is, the second absorption hole 1312 is connected to the second pressure relief portion 1321 to ensure that the high-temperature and high-pressure gas released through the second pressure relief portion 1321 in the event of thermal runaway of the second single battery 132 is transported to the second exhaust chamber 1311 by the second absorption hole 1312 to ensure that the high-temperature and high-pressure gas is discharged, thereby ensuring the safety performance of the battery pack 100.

[0090] In one embodiment, the battery pack 100 further has a reference plane perpendicular to the third direction Z. Along the third direction Z, the orthographic projection of the first pressure relief portion 1221 on the reference plane is located within the orthographic projection of the hole wall of the first absorption hole 1212 on the reference plane, so as to ensure that when the first single battery 122 experiences thermal runaway, the high-temperature and high-pressure gas released through the first pressure relief portion 1221 is completely transported to the first exhaust cavity 1211 by the first absorption hole 1212, thereby further ensuring the safety performance of the battery pack 100.

[0091] Along the third direction Z, the orthographic projection of the second pressure relief portion 1321 on the reference plane is located within the orthographic projection of the hole wall of the second absorption hole 1312 on the reference plane, so as to ensure that when the second single battery 132 experiences thermal runaway, the high-temperature and high-pressure gas released through the second pressure relief portion 1321 can be completely transported to the second exhaust cavity 1311 by the second absorption hole 1312, thereby further ensuring the safety performance of the battery pack 100.

[0092] In one embodiment, in order to optimize the overall exhaust structure of the battery pack 100, in this application, reference is made to Figures 4 to 8 The first beam 1121 is provided with a first exhaust port 11211 and a second exhaust port 11212 which are spaced apart from each other. The first exhaust port 11211 is communicated with the first sub-exhaust channel 11251 , and the second exhaust port 11212 is communicated with the second sub-exhaust channel 11261 .

[0093] The battery pack 100 further includes: a first explosion-proof valve 150 and a second explosion-proof valve 160 . The first explosion-proof valve 150 covers the first exhaust port 11211 to block the first exhaust port 11211 , and the second explosion-proof valve 160 covers the second exhaust port 11212 to block the second exhaust port 11212 .

[0094] It can be understood that when the battery pack 100 is in a normal working state, the first explosion-proof valve 150 blocks the first exhaust port 11211, and the second explosion-proof valve 160 blocks the second exhaust port 11212 to seal the first exhaust channel 1125, the second exhaust channel 1126, the first exhaust cavity 1211 and the second exhaust cavity 1311, thereby isolating the first exhaust channel 1125, the second exhaust channel 1126, the first exhaust cavity 1211 and the second exhaust cavity 1311 from the external space, so that the interior of the battery pack 100 is a closed space, eliminating the influence of the external environment on the components inside the battery pack 100, and ensuring the normal use of the battery pack 100.

[0095] When the first single cell 122 in the battery pack 100 experiences thermal runaway, the generated high-temperature and high-pressure gas is discharged into the first exhaust chamber 1211 and the first exhaust channel 1125; when the air pressure in the first exhaust channel 1125 reaches the pressure threshold of the first explosion-proof valve 150, the first explosion-proof valve 150 is opened, and the gas in the first exhaust chamber 1211 and the first exhaust channel 1125 is discharged into the external environment from the first exhaust port 11211 to ensure the safety performance of the battery pack 100.

[0096] When the second single cell 132 in the battery pack 100 experiences thermal runaway, the generated high-temperature and high-pressure gas is discharged into the second exhaust chamber 1311 and the second exhaust channel 1126; when the air pressure in the second exhaust channel 1126 reaches the pressure threshold of the second explosion-proof valve 160, the second explosion-proof valve 160 is opened, and the gas in the second exhaust chamber 1311 and the second exhaust channel 1126 is discharged into the external environment from the second exhaust port 11212 to ensure the safety performance of the battery pack 100.

[0097] In one embodiment, referring to Figure 3 、 Figure 9 、 Figure 11 The side beam 112 also includes: a third beam 1123 and a fourth beam 1124 connected to each other, the third beam 1123 extends along the first direction X, and the third beam 1123 and the first beam 1121 are spaced apart in the second direction Y, the fourth beam 1124 extends along the second direction Y, and the fourth beam 1124 and the second beam 1122 are spaced apart in the first direction X.

[0098] The box body 110 also includes: multiple first support parts 114 and multiple second support parts 115, one first support part 114 is protrudingly arranged and connected to the side of the first beam 1121 close to the accommodating cavity 113, another first support part 114 is protrudingly arranged and connected to the side of the third beam 1123 close to the accommodating cavity 113, one second support part 115 is connected to the side of the first beam 1121 close to the accommodating cavity 113, another second support part 115 is connected to the side of the third beam 1123 close to the accommodating cavity 113, and the first support part 114 is arranged close to the bottom plate 111 relative to the second support part 115, the first exhaust part 121 is connected to the first support part 114, and the second exhaust part 131 is connected to the second support part 115.

[0099] The first support portion 114 and the first beam 1121, and the first support portion 114 and the third beam 1123 can be integrally formed, that is, the first support portion 114 and the first beam 1121, and the first support portion 114 and the third beam 1123 are an integral structure. For example, the first support portion 114 and the first beam 1121, and the first support portion 114 and the third beam 1123 are all integrally die-cast. The first support portion 114 and the first beam 1121, and the first support portion 114 and the third beam 1123 can also be separately provided and fixedly connected. For example, the first support portion 114 is fixedly connected to the first beam 1121 and the third beam 1123 respectively by a welding process. This is not specifically limited in this application and can be specifically set according to actual circumstances. For example, in this application, the first support portion 114 and the first beam 1121, and the first support portion 114 and the third beam 1123 can be integrally formed.

[0100] The second support portion 115 and the first beam 1121, and the second support portion 115 and the third beam 1123 can be integrally formed, that is, the second support portion 115 and the first beam 1121, and the second support portion 115 and the third beam 1123 are an integral structure. For example, the second support portion 115 and the first beam 1121, and the second support portion 115 and the third beam 1123 are all integrally die-cast. The second support portion 115 and the first beam 1121, and the second support portion 115 and the third beam 1123 can also be separately provided and fixedly connected. For example, the second support portion 115 is fixedly connected to the first beam 1121 and the third beam 1123 respectively by a welding process. This is not specifically limited in this application and can be specifically set according to actual circumstances. For example, in this application, the second support portion 115 and the first beam 1121, and the second support portion 115 and the third beam 1123 can be integrally formed.

[0101] It can be understood that the present application provides a first support portion 114 and a second support portion 115 on the box body 110, and the first exhaust member 121 is connected to the first support portion 114, and the second exhaust member 131 is connected to the second support portion 115, so as to utilize the first support portion 114 and the second support portion 114 to support and fix the first battery assembly 120 and the second battery assembly 130 respectively, thereby avoiding the first battery assembly 120 and the second battery assembly 130 being directly connected to the bottom plate 111 and the side beam 112 of the box body 110 to affect the overall sealing of the battery pack 100, thereby ensuring the overall sealing performance of the battery pack 100.

[0102] In one embodiment, referring to Figure 11 The maximum dimension of the first support portion 114 in the second direction Y is H1 mm, and the maximum dimension of the second support portion 115 in the second direction Y is H2 mm, satisfying the following relationship: H1>H2. That is, the maximum dimension H1 mm of the first support portion 114 in the second direction Y is greater than the maximum dimension H2 mm of the second support portion 115 in the second direction Y. This facilitates the assembly of the first and second battery assemblies 120, 130 into the housing 110, improving the assembly efficiency of the battery pack 100.

[0103] The maximum dimension H1 mm of the first support portion 114 in the second direction Y can be obtained by disassembling the actual battery pack 100, repeatedly measuring the distance between the sidewall of the first beam 1121 on the side of the box 110 close to the accommodating cavity 113 and the sidewall of the first support portion 114 on the side away from the first beam 1121, and calculating the average value. The measuring tool can be, but is not limited to, a ruler, a vernier caliper, or other dimensional measuring instrument.

[0104] The maximum dimension H2 mm of the second support portion 115 in the second direction Y can be obtained by disassembling the actual battery pack 100 and measuring the distance between the sidewall of the first beam 1121 on the housing 110 near the accommodating cavity 113 and the sidewall of the second support portion 115 away from the first beam 1121 multiple times using a measuring tool, and calculating the average value. The measuring tool can be, but is not limited to, a ruler, a vernier caliper, or other dimensional measuring instrument.

[0105] In one embodiment, referring to Figure 13 and Figure 16 The first exhaust member 121 has a first hanging ring portion 1213, which is used to load the first battery assembly 120 into the accommodating cavity 113; the second exhaust member 131 has a second hanging ring portion 1313, which is used to load the second battery assembly 130 into the accommodating cavity 113.

[0106] In the present application, a first hanging ring portion 1213 is provided on the first exhaust member 121 so as to assemble the first battery assembly 120 into the accommodating cavity 113 by using the first hanging ring portion 1213, and a second hanging ring portion 1313 is provided on the second exhaust member 131 so as to assemble the second battery assembly 130 into the accommodating cavity 113 by using the second hanging ring portion 1313, so as to facilitate the assembly of the first battery assembly 120 and the second battery assembly 130 into the box body 110, thereby further improving the assembly efficiency of the battery pack 100.

[0107] On the other hand, in an embodiment of the present application, the present application also provides an electrical device, including: a battery pack 100 as described in any of the above embodiments, the battery pack 100 serves as a power supply for the electrical device to ensure normal operation of the electrical device.

[0108] Among them, electrical devices can be but are not limited to mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0109] The above steps are merely provided to help understand the method, structure, and core concept of the present application. A person skilled in the art may make several improvements and modifications to the present application without departing from the principles of the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack, characterized in that: include: The box body comprises: a bottom plate and side beams, wherein the side beams are arranged around the edge of the bottom plate, and the bottom plate and the side beams cooperate to enclose a receiving cavity, and an exhaust monitoring cavity is opened in the side beams; A first battery assembly is disposed in the accommodating cavity, and includes: a first exhaust member and a first single battery, the first exhaust member being connected to the side beam, the first single battery being disposed on a side of the first exhaust member away from the bottom plate, a first pressure relief portion being disposed on a side of the first single battery facing the first exhaust member, a first exhaust cavity being defined in the first exhaust member, the first pressure relief portion being configured to communicate with the first exhaust cavity, and the first exhaust cavity being communicated with the exhaust monitoring cavity; a second battery assembly disposed in the accommodating cavity, and comprising: a second exhaust member and a second single battery, the second exhaust member being connected to the side beam and disposed away from the bottom plate relative to the first exhaust member, the second single battery being disposed on a side of the second exhaust member away from the bottom plate, a second pressure relief portion being disposed on a side of the second single battery facing the second exhaust member, a second exhaust cavity being defined within the second exhaust member, the second pressure relief portion being configured to communicate with the second exhaust cavity, and the second exhaust cavity being communicated with the exhaust monitoring cavity; and A pressure-sensitive element is arranged on the side beam, and the pressure-sensitive element has a sensing end, at least part of which is arranged in the exhaust monitoring cavity, and the pressure-sensitive element is used to monitor the air pressure in the exhaust monitoring cavity.

2. The battery pack according to claim 1, wherein: A first exhaust channel and a second exhaust channel are provided in the side beam, and the first exhaust channel and the second exhaust channel are separated; The first exhaust chamber is communicated with the exhaust monitoring chamber through the first exhaust channel, and the second exhaust chamber is communicated with the exhaust monitoring chamber through the second exhaust channel.

3. The battery pack according to claim 2, wherein: The battery pack has a first direction and a second direction intersecting each other; The side beam comprises: a first beam and a second beam connected to each other, the first beam extending along the first direction, and the second beam extending along the second direction; A first sub-exhaust channel and a second sub-exhaust channel are defined in the first beam, a third sub-exhaust channel and a fourth sub-exhaust channel are defined in the second beam, the exhaust monitoring chamber is located in the second beam, and the third sub-exhaust channel and the fourth sub-exhaust channel are both communicated with the exhaust monitoring chamber; The first sub-exhaust channel is communicated with the third sub-exhaust channel to form the first exhaust channel, and the second sub-exhaust channel is communicated with the fourth sub-exhaust channel to form the second exhaust channel.

4. The battery pack according to claim 3, wherein: The second beam includes: a main body, the main body is provided with an opening, the opening is communicated with the exhaust monitoring cavity; and The sealing part is sealed on the opening, and a monitoring port is provided on the sealing part, and the pressure sensitive element is sealed on the monitoring port.

5. The battery pack according to claim 3, wherein: The first beam is provided with a first exhaust port and a second exhaust port spaced apart from each other, the first exhaust port is communicated with the first sub-exhaust channel, and the second exhaust port is communicated with the second sub-exhaust channel; The battery pack further includes a first explosion-proof valve and a second explosion-proof valve, wherein the first explosion-proof valve is sealed on the first exhaust port, and the second explosion-proof valve is sealed on the second exhaust port.

6. The battery pack according to claim 1, wherein: The first exhaust member is provided with a first absorption hole, the first absorption hole is communicated with the first exhaust cavity, and the first absorption hole is arranged opposite to the first pressure relief portion; A second absorption hole is formed on the second exhaust member. The second absorption hole is communicated with the second exhaust cavity, and the second absorption hole is arranged opposite to the second pressure relief portion.

7. The battery pack according to claim 3, wherein: The side beam further includes: a third beam and a fourth beam connected to each other, the third beam extending along the first direction, and the third beam and the first beam are spaced apart in the second direction, the fourth beam extending along the second direction, and the fourth beam and the second beam are spaced apart in the first direction; The box body also includes: multiple first support parts and multiple second support parts, one first support part is protruding and connected to the side of the first beam close to the accommodating cavity, another first support part is protruding and connected to the side of the third beam close to the accommodating cavity, one second support part is connected to the side of the first beam close to the accommodating cavity, another second support part is connected to the side of the third beam close to the accommodating cavity, and the first support part is arranged close to the bottom plate relative to the second support part, the first exhaust part is connected to the first support part, and the second exhaust part is connected to the second support part.

8. The battery pack according to claim 7, wherein: The maximum dimension of the first support portion in the second direction is H1 mm, and the maximum dimension of the second support portion in the second direction is H2 mm, satisfying: H1>H2.

9. The battery pack according to claim 1, wherein: The first exhaust member has a first hanging ring portion, and the first hanging ring portion is used to load the first battery assembly into the accommodating cavity; The second exhaust member has a second hanging ring portion, and the second hanging ring portion is used to load the second battery assembly into the accommodating cavity.

10. An electrical device, characterized in that: include: The battery pack according to any one of claims 1 to 9, wherein the battery pack serves as a power supply for the electrical device.

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