Battery pack and electric device

Abstract

The utility model discloses a battery pack and an electric device, and relates to the field of batteries. The battery pack comprises a battery cell assembly, a liquid cooling exhaust part and a sealing separator. The liquid cooling exhaust part is arranged on the side, provided with the anti-explosion valve, of the battery cell, the liquid cooling exhaust part is provided with a liquid cooling flow channel and an exhaust channel, the liquid cooling flow channel and the exhaust channel are arranged at an interval, an air inlet hole and a mounting groove are formed in the side, close to the anti-explosion valve, of the liquid cooling exhaust part, and the mounting groove communicates with the air inlet hole; the part, which faces the liquid cooling exhaust part and is exposed relative to the battery cell, of the anti-explosion valve and the orthographic projection of the air inlet hole on the liquid cooling exhaust part are located in the mounting groove, an exhaust hole is formed in one end of the liquid cooling exhaust part, and the exhaust channel is communicated with the air inlet hole and the exhaust hole respectively; the sealing separator is arranged in the mounting groove, one side, far away from the air inlet hole, of the sealing separator is in contact with one side, close to the anti-explosion valve, of the battery cell, and one side, far away from the anti-explosion valve, of the sealing separator is provided with a heat insulation layer located in the mounting groove and / or the air inlet hole. According to the battery pack provided by the invention, the thermal runaway diffusion risk is reduced.

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] During the use of the battery pack, when a single cell experiences thermal runaway, a large amount of heat will be released in a short period of time, and high-temperature combustible gas will be ejected. If reasonable measures are not taken, the generated heat and high-temperature combustible gas will cause the thermal runaway to spread and even cause the battery pack to burn and explode. Utility Model Content

[0003] In order to achieve the above-mentioned purpose, the present application is based on this and aims to provide a battery pack, aiming to solve the technical problem in the prior art that the heat and high-temperature combustible gas generated after thermal runaway of a single cell may cause the thermal runaway to spread and even cause the battery pack to burn and explode.

[0004] The technical solutions adopted are as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery pack having a third orientation, the battery pack comprising:

[0006] A battery cell assembly, the battery cell assembly comprising a plurality of battery cells arranged in an array, the battery cells being provided with explosion-proof valves, each of the explosion-proof valves being located on the same side of the corresponding battery cell along the third direction;

[0007] a liquid-cooled exhaust member disposed on a side of the battery cell where the explosion-proof valve is provided, the liquid-cooled exhaust member having a liquid-cooling flow channel and an exhaust channel, the liquid-cooling flow channel and the exhaust channel being spaced apart, an air inlet hole and a mounting groove being provided on a side of the liquid-cooled exhaust member close to the explosion-proof valve, the mounting groove being communicated with the air inlet hole, a portion of the explosion-proof valve facing the liquid-cooled exhaust member and exposed relative to the battery cell and an orthographic projection of the air inlet hole on the liquid-cooled exhaust member being located within the mounting groove, an exhaust hole being provided at one end of the liquid-cooled exhaust member, and the exhaust channel being communicated with the air inlet hole and the exhaust hole, respectively;

[0008] A sealing isolator is arranged in the mounting groove, and the side of the sealing isolator away from the air inlet is in contact with the side of the battery cell close to the explosion-proof valve, and a heat insulation layer is provided on the side of the sealing isolator away from the explosion-proof valve, and the heat insulation layer is located in the mounting groove and / or the air inlet.

[0009] In one embodiment of the first aspect, the thermal insulation layer is located in the air inlet hole, and a circumferential edge of the thermal insulation layer contacts a hole wall of the air inlet hole.

[0010] In one embodiment of the first aspect, the sealing isolator is an elastic member, the thickness of the sealing isolator in a natural state is T1 mm, the depth of the mounting groove is T2 mm, and the relationship is satisfied: (T1-T2) / T1=K1, 0.05≤K1≤0.3.

[0011] In one embodiment of the first aspect, the orthographic projection of the portion of the explosion-proof valve facing the liquid-cooled exhaust member and exposed relative to the battery cell on the liquid-cooled exhaust member is located within the air inlet, and the orthographic projection area of the portion of the explosion-proof valve facing the liquid-cooled exhaust member and exposed relative to the battery cell on the liquid-cooled exhaust member is S1 mm 2 The positive projection area of the air inlet on the liquid cooling exhaust part is S2mm 2 , satisfying the relationship: S1 / S2=K2, 0.7≤K2≤1.

[0012] In one embodiment of the first aspect, the orthographic projection area of the mounting groove on the liquid-cooled exhaust component is S3 mm 2 , satisfying the relationship: S2 / S3=K3, 0.7≤K3≤0.9.

[0013] In one of the embodiments of the first aspect, an insulating thermally conductive adhesive layer is provided between the battery core and the liquid-cooled exhaust component, and the insulating thermally conductive adhesive layer is respectively in contact with a portion of the battery core circumferentially surrounding the explosion-proof valve and a portion of the liquid-cooled exhaust component circumferentially surrounding the mounting groove.

[0014] In one of the embodiments of the first aspect, an annular glue overflow groove is opened on the side of the liquid-cooled exhaust component close to the explosion-proof valve, the annular glue overflow groove circumferentially surrounds the installation groove and is spaced apart from the installation groove, and the insulating thermal conductive glue layer circumferentially surrounds the annular glue overflow groove.

[0015] In one embodiment of the first aspect, the battery pack further includes an insulating buffer component, the insulating thermally conductive adhesive layer is provided with an avoidance hole, the insulating buffer component is located in the avoidance hole, and is in contact with the battery cell and the liquid-cooling exhaust component respectively.

[0016] In one embodiment of the first aspect, the battery pack has a first direction and a second direction, the second direction is perpendicular to the first direction, and the third direction is perpendicular to the first and second directions. The liquid-cooling exhaust member further has a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are spaced apart along the first direction at an end of the liquid-cooling exhaust member away from the exhaust hole, and the liquid-cooling flow channel is respectively connected to the liquid inlet and the liquid outlet.

[0017] The liquid cooling channel includes a plurality of sub-channels spaced apart along the first direction and extending along the second direction. The plurality of sub-channels are connected and their projections on the plane shared by the first direction and the second direction are serpentine. The exhaust channel extends along the second direction and is spaced apart from the sub-channels along the first direction.

[0018] In a second aspect, an embodiment of the present application further provides an electrical device comprising the battery pack described in any of the above embodiments.

[0019] The beneficial effects of the present application are as follows: the present application proposes a battery pack and an electrical device, the battery pack including a cell assembly, a liquid-cooled exhaust component and a sealing isolation component, the cell assembly including a plurality of cells arranged in an array, the cells being provided with explosion-proof valves, and the explosion-proof valves of each cell being located on the same side of the third direction. The liquid-cooled exhaust component has liquid-cooled flow channels and exhaust channels spaced apart from each other. By arranging the liquid-cooled exhaust component on the side of the cell provided with the explosion-proof valve, the coolant can absorb the heat generated by thermal runaway of the cell when flowing through the liquid-cooled flow channel. After the coolant leaves the liquid-cooled flow channel, this heat is taken away from the battery pack, thereby achieving rapid cooling of the cell and effectively reducing the risk of thermal runaway, diffusion, combustion and explosion in the battery pack.

[0020] By providing interconnected mounting grooves and air inlet holes on a side of the liquid-cooled exhaust component near the explosion-proof valve, the air inlet hole is connected to the exhaust channel, the portion of the explosion-proof valve facing the liquid-cooled exhaust component and exposed relative to the battery cell and the orthographic projection of the air inlet hole on the liquid-cooled exhaust component are both located within the mounting groove, a sealing isolator is disposed within the mounting groove with the side away from the air inlet hole in contact with the side of the battery cell near the explosion-proof valve, and an exhaust hole connected to the exhaust channel is provided at one end of the liquid-cooled exhaust component. In this way, when one of the battery cells experiences thermal runaway, the high-temperature emissions discharged from its explosion-proof valve can melt and break through the sealing isolator corresponding to the explosion-proof valve and be discharged in sequence through the mounting groove, the air inlet hole, the exhaust channel, and the exhaust hole. In this process, the coolant flowing through the liquid-cooled flow channel can absorb the heat of the high-temperature emissions in the exhaust channel, thereby achieving rapid cooling of the high-temperature emissions. The high-temperature emissions are cooled and then discharged through the exhaust hole, preventing the high-temperature emissions from being directly discharged to the outside of the battery pack and burning outside the battery pack, thereby further reducing the risk of thermal runaway, spread, combustion, and explosion in the battery pack.

[0021] At the same time, by arranging a thermal insulation layer in the mounting groove and / or the air inlet hole on the side of the sealing isolation component away from the explosion-proof valve, the thermal insulation effect of the thermal insulation layer prevents the high-temperature emissions in the exhaust channel from transferring heat to the remaining battery cells that have not experienced thermal runaway, effectively reducing the probability of thermal runaway and chain transmission of the battery cells, thereby further reducing the risk of thermal runaway and combustion and explosion of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 shows a three-dimensional schematic diagram of a battery pack in some embodiments of the present application;

[0024] Figure 2 shows a schematic cross-sectional view of a battery pack in some embodiments of the present application;

[0025] Figure 3 Shown Figure 2 A magnified schematic diagram of the structure of part A;

[0026] Figure 4 A schematic diagram of an exploded view of a battery pack in some embodiments of the present application is shown;

[0027] Figure 5 Shows a schematic exploded view of a battery pack from another perspective in some embodiments of the present application;

[0028] Figure 6 A schematic cross-sectional view of a liquid-cooled exhaust component in some embodiments of the present application is shown.

[0029] Description of main component symbols:

[0030] 100-battery pack; 110-cell assembly; 111-cell; 1111-explosion-proof valve; 120-liquid-cooling exhaust component; 121-liquid-cooling flow channel; 1211-sub-flow channel; 122-exhaust channel; 123-air inlet; 124-mounting slot; 125-exhaust hole; 126-annular glue overflow groove; 127-liquid inlet; 128-liquid outlet; 130-sealing isolation component; 131-thermal insulation layer; 140-insulating thermal conductive adhesive layer. DETAILED DESCRIPTION

[0031] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0032] 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", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0034] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] like Figure 1 、 Figure 2 and Figure 3 As shown, an embodiment of the present application provides a battery pack 100 , which is mainly used in electrical devices. The battery pack 100 has a third orientation and includes: a cell assembly 110 , a liquid cooling exhaust member 120 , and a sealing isolation member 130 .

[0037] See also Figure 4 and Figure 5 The battery cell assembly 110 includes a plurality of battery cells 111 arranged in an array. The battery cells 111 are provided with explosion-proof valves 1111 . Each of the explosion-proof valves 1111 is located on the same side of the corresponding battery cell 111 along the third direction. The liquid-cooled exhaust component 120 is arranged on a side of the battery cell 111 where the explosion-proof valve 1111 is provided. The liquid-cooled exhaust component 120 has a liquid-cooling flow channel 121 and an exhaust channel 122. The liquid-cooling flow channel 121 and the exhaust channel 122 are spaced apart. An air inlet 123 and a mounting groove 124 are provided on the side of the liquid-cooled exhaust component 120 close to the explosion-proof valve 1111. The mounting groove 124 is connected to the air inlet 123. The portion of the explosion-proof valve 1111 facing the liquid-cooled exhaust component 120 and exposed relative to the battery cell 111 and the orthographic projection of the air inlet 123 on the liquid-cooled exhaust component 120 are both located in the mounting groove 124. An exhaust hole 125 is provided at one end of the liquid-cooled exhaust component 120, and the exhaust channel 122 is respectively connected to the air inlet 123 and the exhaust hole 125.

[0038] The sealing isolation member 130 is arranged in the installation groove 124, and the side of the sealing isolation member 130 away from the air inlet hole 123 is in contact with the side of the battery cell 111 close to the explosion-proof valve 1111, and the side of the sealing isolation member 130 away from the explosion-proof valve 1111 is provided with a heat insulation layer 131, and the heat insulation layer 131 is located in the installation groove 124 and / or the air inlet hole 123.

[0039] It should be mentioned that in this patent, "the orthographic projection of the air inlet hole 123 on the liquid-cooled exhaust component 120" refers to "the orthographic projection of the hole wall at the position where the air inlet hole 123 is opened on the liquid-cooled exhaust component 120" on the liquid-cooled exhaust component.

[0040] The battery pack 100 provided in the embodiment of the present application has a liquid-cooling exhaust component 120 having a liquid-cooling flow channel 121 and an exhaust channel 122 spaced apart from each other. By arranging the liquid-cooling exhaust component 120 on the side of the battery cell 111 where the explosion-proof valve 1111 is provided, the coolant can absorb the heat generated by the thermal runaway of the battery cell 111 when flowing through the liquid-cooling flow channel 121. After the coolant leaves the liquid-cooling flow channel 121, this part of the heat is taken away from the battery pack 100, thereby achieving rapid cooling of the battery cell 111 and effectively reducing the risk of thermal runaway, diffusion, combustion and explosion of the battery pack 100.

[0041] By opening a mounting groove 124 and an air inlet 123 that are interconnected on one side of the liquid-cooled exhaust component 120 close to the explosion-proof valve 1111, the air inlet 123 is connected to the exhaust channel 122, the explosion-proof valve 1111 faces the liquid-cooled exhaust component 120 and the exposed portion relative to the battery cell 111 and the positive projection of the air inlet 123 on the liquid-cooled exhaust component 120 are both located in the mounting groove 124, the sealing isolation component 130 is arranged in the mounting groove 124 and the side away from the air inlet 123 is in contact with the side of the battery cell 111 close to the explosion-proof valve 1111, and an exhaust hole 125 connected to the exhaust channel 122 is opened at one end of the liquid-cooled exhaust component 120. In this way, when one of the battery cells 111 experiences thermal runaway, the high-temperature emissions discharged from its explosion-proof valve 1111 can melt and break through the sealing isolation member 130 corresponding to the explosion-proof valve 1111, and be discharged sequentially through the mounting groove 124, the air inlet 123, the exhaust channel 122, and the exhaust hole 125. During this process, the coolant flowing through the liquid cooling channel 121 absorbs the heat from the high-temperature emissions in the exhaust channel 122, rapidly cooling the high-temperature emissions. After cooling, the high-temperature emissions are discharged through the exhaust hole 125, preventing the high-temperature emissions from being directly discharged to the outside of the battery pack 100 and combusting outside the battery pack 100, potentially causing combustion in the electrical device. This further reduces the risk of thermal runaway, diffusion, combustion, and explosion in the battery pack 100, effectively improving the overall safety of the battery pack 100 and the electrical device. Furthermore, this facilitates thermal and electrical isolation, preventing the high-temperature emissions from being directly discharged into the electrical space of the battery pack 100, which could pose insulation risks.

[0042] At the same time, by arranging a thermal insulation layer 131 in the mounting groove 124 and / or the air inlet 132 on the side of the sealing isolation member 130 away from the explosion-proof valve 1111, the thermal insulation layer 131 can prevent the high-temperature emissions in the exhaust channel 122 from transferring heat to the remaining battery cells 111 that have not experienced thermal runaway under the thermal insulation effect of the thermal insulation layer 131, thereby effectively reducing the probability of thermal runaway and chain propagation of the battery cells 111, thereby further reducing the risk of thermal runaway and combustion and explosion of the battery pack 100, and further improving the overall safety performance of the battery pack 100 and the electrical device.

[0043] It is understood that by positioning the sealing isolator 130 within the mounting groove 124 with the side away from the air inlet 123 in contact with the side of the battery cell 111 near the explosion-proof valve 1111, the sealing isolator 130 can, on the one hand, seal the gap between the battery cell 111 and the liquid-cooled exhaust member 120, thereby preventing high-temperature emissions from the explosion-proof valve 1111 from leaking through the gap between the battery cell 111 and the liquid-cooled exhaust member 120 when one of the battery cells 111 experiences thermal runaway, thereby preventing the adjacent battery cell 111 from also experiencing thermal runaway. On the other hand, the sealing isolator 130 can also seal the gap between the explosion-proof valve 1111 and the air inlet 123, thereby preventing high-temperature emissions within the exhaust passage 122 from being transmitted through the gap between the air inlet 123 and the explosion-proof valve 1111 to the remaining battery cells 111 that have not experienced thermal runaway, effectively reducing the probability of thermal runaway and chain transmission in the battery cells 111.

[0044] For example, the sealing isolation member 130 may be made of rubber or silicone, and the heat insulation layer 131 may be provided on one side of the sealing isolation member 130 by coating.

[0045] It should be noted that the first direction corresponds to Figure 1 and Figure 6 The Z direction in .

[0046] like Figure 3 As shown, in one embodiment of the present application, the heat insulation layer 131 is located in the air inlet hole 123 , and the circumferential edge of the heat insulation layer 131 is in contact with the hole wall of the air inlet hole 123 .

[0047] In this embodiment, the thermal insulation layer 131 is arranged in the air inlet hole 123, and the circumferential edge of the thermal insulation layer 131 is in contact with the hole wall of the air inlet hole 123 to seal the gap between the thermal insulation layer 131 and the air inlet hole 123, thereby preventing the high-temperature emissions in the exhaust channel 122 from transferring heat to the sealing isolation member 130 and the battery cell 111 that has not experienced thermal runaway in sequence through the gap between the air inlet hole 123 and the thermal insulation layer 131, thereby further reducing the probability of thermal runaway and chain propagation of the battery cell 111.

[0048] like Figure 3 As shown, in one embodiment of the present application, the sealing isolation member 130 is an elastic member, the thickness of the sealing isolation member 130 in the natural state is T1 mm, the groove depth of the mounting groove 124 is T2 mm, and the relationship is satisfied: (T1-T2) / T1=K1, 0.05≤K1≤0.3.

[0049] In this embodiment, the sealing spacer 130 is an elastic member. By setting the ratio K1 of the difference between the natural thickness T1 of the sealing spacer 130 and the groove depth T2 of the mounting groove 124 to the natural thickness T1 of the sealing spacer 130 to be between 0.05 and 0.3, that is, the compression ratio of the sealing spacer 130 is controlled to be between 5% and 30%. This can prevent the compression ratio of the sealing spacer 130 from being too low, which can lead to poor contact between the sealing spacer 130 and the battery cell 111, resulting in poor sealing between the battery cell 111 and the liquid-cooling exhaust 120. This can also cause the high-temperature exhaust discharged by the explosion-proof valve 1111 to leak through the gap between the battery cell 111 and the liquid-cooling exhaust 120 when one of the battery cells 111 thermally runs away, causing the adjacent battery cell 111 to also thermally run away.

[0050] On the other hand, it can also avoid the compression ratio of the sealing isolation 130 being too large, which causes the thickness of the sealing isolation 130 to be too thick in the natural state, resulting in the high-temperature emissions discharged from the explosion-proof valve 1111 being unable to melt and break through the sealing isolation 130 to be discharged through the exhaust channel 122, thereby causing the battery pack 100 to have thermal runaway diffusion and combustion and explosion technical problems.

[0051] In order to better reflect the beneficial effects of the corresponding parameters and relationship, the following experimental data are further provided. For specific examples and test results, please refer to the following table:

[0052]

[0053]

[0054] In each of Examples 1 to 6, 1,000 battery packs 100 were prepared according to the parameters in the table, and the sealing efficiency and melting rupture rate of the sealing spacer 130 were statistically analyzed. The sealing efficiency and melting rupture rate statistics are shown in the table above, both exceeding 99%, which are high and meet the design requirements. In addition, in each of Comparative Examples 1 to 2, 1,000 battery packs 100 were prepared according to the parameters in the table, and the sealing efficiency and melting rupture rate of the sealing spacer 130 were statistically analyzed. The sealing efficiency and melting rupture rate statistics are shown in the table above. When the compression ratio is 2%, the sealing efficiency of the sealing spacer 130 is less than 90%, which is low and does not meet the design requirements. When the compression ratio is 40%, the melting rupture rate of the sealing spacer 130 is less than 90%, which is low and does not meet the design requirements.

[0055] like Figure 3 and Figure 4As shown, in one embodiment of the present application, the orthographic projection of the portion of the explosion-proof valve 1111 facing the liquid-cooled exhaust member 120 and exposed relative to the battery cell 111 on the liquid-cooled exhaust member 120 is located within the air inlet 123, and the orthographic projection area of the portion of the explosion-proof valve 1111 facing the liquid-cooled exhaust member 120 and exposed relative to the battery cell 111 on the liquid-cooled exhaust member 120 is S1 mm 2 The positive projection area of the air inlet 123 on the liquid cooling exhaust member 120 is S2mm 2 , satisfying the relationship: S1 / S2=K2, 0.7≤K2≤1.

[0056] In this embodiment, the explosion-proof valve 1111 is arranged to face the liquid-cooled exhaust component 120 and the positive projection of the exposed portion relative to the battery cell 111 on the liquid-cooled exhaust component 120 is located within the air inlet 123. In this way, the explosion-proof valve 1111 faces the liquid-cooled exhaust component 120 and the exposed portion (sealing portion) relative to the battery cell 111 is directly opposite the air inlet 123, so that the discharged high-temperature exhaust materials can enter the exhaust channel 122 completely through the air inlet 123, so that the air inlet 123 is not smaller than the exposed portion of the explosion-proof valve 1111 facing the liquid-cooled exhaust component 120 and relative to the battery cell 111, thereby avoiding the technical problem of poor exhaust effect caused by the air inlet 123 being smaller than the exposed portion of the explosion-proof valve 1111 facing the liquid-cooled exhaust component 120 and relative to the battery cell 111.

[0057] By controlling the ratio K2 of the orthographic projection area S1 of the portion of the explosion-proof valve 1111 facing the liquid-cooled exhaust component 120 and exposed relative to the battery cell 111 on the liquid-cooled exhaust component 120 to the orthographic projection area S2 of the air inlet hole 123 on the liquid-cooled exhaust component 120 within the range of 0.7 to 1, on the one hand, this can avoid the technical problem of poor exhaust effect caused by the air inlet hole 123 being smaller than the portion of the explosion-proof valve 1111 facing the liquid-cooled exhaust component 120 and exposed relative to the battery cell 111; on the other hand, it can also avoid the technical problem of high-temperature emissions affecting adjacent battery cells 111 and causing thermal runaway diffusion due to the air inlet hole 123 being too large.

[0058] In order to better reflect the beneficial effects of the corresponding parameters and relationship, the following experimental data are further provided. For specific examples and test results, please refer to the following table:

[0059]

[0060] In each of Examples 7-10, 1,000 battery packs 100 were prepared according to the parameters in the table, and the exhaust efficiency and thermal runaway diffusivity were calculated. The exhaust efficiency and thermal runaway diffusivity statistics are as shown in the table above. The exhaust efficiency is greater than 99%, and the thermal runaway diffusivity is less than 0.5%. The exhaust efficiency is high and the thermal runaway diffusivity is low, meeting the design requirements. In addition, in each of Comparative Examples 3-4, 1,000 battery packs 100 were prepared according to the parameters in the table, and the exhaust efficiency and thermal runaway diffusivity were calculated. The exhaust efficiency and thermal runaway diffusivity statistics are as shown in the table above. When the orthographic projection area ratio K2 is 0.6, the thermal runaway diffusivity is greater than 10%, which is high and does not meet the design requirements. When the orthographic projection area ratio K2 is 1.2, the exhaust efficiency is less than 90%, which is low and does not meet the design requirements.

[0061] In the above embodiment of the present application, the orthographic projection area of the mounting groove 124 on the liquid-cooled exhaust member 120 is S3 mm. 2 , satisfying the relationship: S2 / S3=K3, 0.7≤K3≤0.9.

[0062] In this embodiment, by controlling the ratio K3 of the orthographic projection area S2 of the air inlet hole 123 on the liquid-cooling exhaust member 120 to the orthographic projection area S3 of the mounting groove 124 on the liquid-cooling exhaust member 120 within a range of 0.7 to 0.9, this can prevent the bottom wall area of the mounting groove 124 from being too small, thereby reducing the contact area between the sealing spacer 130 and the bottom surface of the mounting groove 124 and affecting the installation stability of the sealing spacer 130. It can also prevent the bottom wall area of the mounting groove 124 from being too large, thereby preventing high-temperature emissions from affecting adjacent battery cells 111 and causing thermal runaway diffusion.

[0063] In each of Examples 7-10, 1,000 battery packs 100 were prepared according to the parameters in the table, and the thermal runaway diffusivity and installation stability were statistically analyzed. The thermal runaway diffusivity and installation stability statistics are as shown in the table above. The thermal runaway diffusivity was less than 0.5%, which means the thermal runaway diffusivity was low and the installation stability was high, meeting the design requirements. In addition, in each of Comparative Examples 3-4, 1,000 battery packs 100 were prepared according to the parameters in the table, and the thermal runaway diffusivity and installation stability were statistically analyzed. The thermal runaway diffusivity and installation stability statistics are as shown in the table above. When the orthographic projection area ratio K3 was 0.6, the thermal runaway diffusivity was greater than 10%, and the installation stability was high, but the thermal runaway diffusivity was high, which did not meet the design requirements. When the orthographic projection area ratio K3 was 0.99, the thermal runaway diffusivity was less than 0.5%, which means the thermal runaway diffusivity was low, but the installation stability was low, which did not meet the design requirements.

[0064] like Figure 3As shown, in one embodiment of the present application, an insulating thermally conductive adhesive layer 140 is provided between the battery core 111 and the liquid-cooled exhaust component 120, and the insulating thermally conductive adhesive layer 140 is respectively in contact with the portion of the battery core 111 circumferentially surrounding the explosion-proof valve 111 and the portion of the liquid-cooled exhaust component 120 circumferentially surrounding the mounting groove 124.

[0065] In this embodiment, an insulating thermally conductive adhesive layer 140 is provided between the battery cell 111 and the liquid-cooled exhaust component 120, which is in contact with the portion of the battery cell 111 circumferentially surrounding the explosion-proof valve 111 and the portion of the liquid-cooled exhaust component 120 circumferentially surrounding the mounting groove 124, respectively. In this way, on the one hand, under the heat conduction effect of the insulating thermally conductive adhesive layer 140, the heat generated by the thermal runaway of the battery cell 111 can be transferred to the liquid-cooled exhaust component 120 through the insulating thermally conductive adhesive layer 140, so that when the coolant flows through the liquid-cooling channel 121, it can absorb the heat generated by the thermal runaway of the battery cell 111. After the coolant leaves the liquid-cooling channel 121, this part of the heat is taken away from the battery pack 100, thereby achieving rapid cooling of the battery cell 111 and effectively reducing the risk of thermal runaway, diffusion, combustion and explosion of the battery pack 100.

[0066] Furthermore, the insulating thermally conductive adhesive layer 140 can also securely attach the battery cell 111 to the liquid-cooled exhaust member 120, ensuring the stability and reliability of the installation of the battery cell 111. Furthermore, the insulating thermally conductive adhesive layer 140 also provides insulation, preventing direct contact between the battery cell 111 and the liquid-cooled exhaust member 120, which could lead to insulation risks.

[0067] like Figure 3 and Figure 4 As shown, in the above embodiment of the present application, an annular glue overflow groove 126 is opened on the side of the liquid-cooled exhaust component 120 close to the explosion-proof valve 1111, and the annular glue overflow groove 126 circumferentially surrounds the installation groove 124 and is spaced apart from the installation groove 124, and the insulating thermal conductive glue layer 140 circumferentially surrounds the annular glue overflow groove 126.

[0068] In this embodiment, an annular glue overflow groove 126 is opened on one side of the liquid-cooled exhaust component 120 close to the explosion-proof valve 1111, circumferentially surrounding the mounting groove 124 and spaced apart from the mounting groove 124, and the insulating thermal conductive adhesive layer 140 circumferentially surrounds the annular glue overflow groove 126. In this way, when the battery cell 111 and the liquid-cooled exhaust component 120 are pressed and installed, causing the insulating thermal conductive adhesive layer 140 to overflow, the annular glue overflow groove 126 can accommodate the overflowed adhesive layer, thereby avoiding the insulating thermal conductive adhesive layer 140 overflowing into the mounting groove 124 and the air inlet 123, causing a technical problem of hindering the discharge of high-temperature emissions into the exhaust channel 122.

[0069] In the above embodiment of the present application, the battery pack 100 further includes an insulating buffer, the insulating thermal conductive adhesive layer 140 is provided with an avoidance hole, the insulating buffer is located in the avoidance hole, and is in contact with the battery cell 111 and the liquid-cooling exhaust component 120 respectively.

[0070] In this embodiment, a relief hole is formed in the insulating thermally conductive adhesive layer 140, and an insulating buffer member is disposed within the relief hole, contacting the battery cell 111 and the liquid-cooling exhaust member 120, respectively. This buffering action provides a buffering and vibration reduction function, reducing the impact force between the battery cell 111 and the liquid-cooling exhaust member 120 during movement of the battery pack 100. This ensures the operational stability and reliability of the battery cell 111 and extends the service life of the battery cell 111. Furthermore, the insulating buffer member provides insulation, preventing direct contact between the battery cell 111 and the liquid-cooling exhaust member 120, which could lead to insulation risks.

[0071] like Figure 4 、 Figure 5 and Figure 6 As shown, in any of the above embodiments of the present application, the battery pack 100 has a first direction and a second direction, the second direction is perpendicular to the first direction, and the third direction is perpendicular to the first direction and the second direction. The liquid-cooled exhaust member 120 also has a liquid inlet 127 and a liquid outlet 128. The liquid inlet 127 and the liquid outlet 128 are spaced apart along the first direction at one end of the liquid-cooled exhaust member 120 away from the exhaust hole 125, and the liquid-cooling channel 121 is respectively connected to the liquid inlet 127 and the liquid outlet 128.

[0072] The liquid cooling channel 121 includes a plurality of sub-channels 1211 spaced apart along the first direction and extending along the second direction. The plurality of sub-channels 1211 are connected and their projections on the plane shared by the first direction and the second direction are serpentine. The exhaust channel 122 extends along the second direction and is spaced apart from the sub-channels 1211 along the first direction.

[0073] In this embodiment, by connecting the liquid-cooling channel 121 of the liquid-cooling exhaust member 120 to the liquid inlet 127 and the liquid outlet 128, respectively, coolant from outside the battery pack 100 can enter the liquid-cooling channel 121 through the liquid inlet 127. As the coolant flows through the liquid-cooling channel 121, it absorbs heat generated by thermal runaway of the battery cells 111 and is discharged through the liquid outlet 128, removing the absorbed heat from the battery pack 100, thereby rapidly cooling the battery cells 111. By spacing the liquid inlet 127 and the liquid outlet 128 along the first direction at one end of the liquid-cooling exhaust member 120 away from the exhaust hole 125, the coolant inlet and outlet 128 and the exhaust hole 125 for discharging high-temperature exhaust are located at opposite ends of the liquid-cooling exhaust member 120. This prevents high-temperature exhaust discharged from the exhaust hole 125 from affecting the inflow and outflow of coolant, or vice versa, effectively minimizing the mutual influence between the two.

[0074] By providing liquid-cooling channel 121 with multiple sub-channels 1211 spaced apart along a first direction and extending along a second direction, with the multiple sub-channels 1211 connected and projecting in a serpentine shape onto a plane shared by the first and second directions, the length of liquid-cooling channel 121 and the orthographic projection area of liquid-cooling channel 121 on liquid-cooling exhaust member 120 are effectively increased, thereby extending the coolant flow path and increasing the heat exchange area, allowing for sufficient heat exchange between the coolant and the battery cell assembly 110, effectively improving heat exchange efficiency and thereby achieving rapid cooling of the battery cell assembly 110. By extending exhaust channel 122 along the second direction and spaced apart from sub-channel 1211 along the first direction, exhaust channel 122 and sub-channel 1211 are disconnected from each other, thereby preventing high-temperature exhaust from exhaust channel 122 from affecting the flow of coolant, or vice versa. This effectively reduces the mutual influence between the two and ensures the stability of the liquid cooling and exhaust functions of liquid-cooling exhaust member 120.

[0075] It should be noted that the first direction corresponds to Figure 1 and Figure 6 The X direction in the second direction corresponds to Figure 1 and Figure 6 The multiple sub-channels 1211 spaced apart along the first direction and extending along the second direction are connected at both ends by arc segments in sequence, so that the projection of the liquid-cooling channel 121 on the plane shared by the first and second directions is serpentine.

[0076] An embodiment of the present application further provides an electrical device, comprising the battery pack 100 in any of the above embodiments.

[0077] The electrical device includes the battery pack 100 in any of the above embodiments, and thus has all the beneficial effects of the battery pack 100 , which will not be described in detail here.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0079] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery pack, characterized in that: The battery pack (100) has a third direction (Z), and the battery pack (100) comprises: A battery cell assembly (110), the battery cell assembly (110) comprising a plurality of battery cells (111) arranged in an array, the battery cells (111) being provided with explosion-proof valves (1111), and each explosion-proof valve (1111) being located on the same side of the corresponding battery cell (111) along the third direction (Z); A liquid-cooled exhaust component (120) is provided on a side of the battery core (111) where the explosion-proof valve (1111) is provided. The liquid-cooled exhaust component (120) has a liquid-cooled flow channel (121) and an exhaust channel (122). The liquid-cooled flow channel (121) and the exhaust channel (122) are spaced apart. An air inlet (123) and an installation groove (124) are provided on a side of the liquid-cooled exhaust component (120) close to the explosion-proof valve (1111). The installation groove (124) is aligned with the liquid-cooled flow channel (121). The liquid-cooled exhaust component (120) is connected to the air inlet (123), the explosion-proof valve (1111) faces the liquid-cooled exhaust component (120), and the exposed portion relative to the battery core (111) and the orthographic projection of the air inlet (123) on the liquid-cooled exhaust component (120) are both located in the mounting groove (124), an exhaust hole (125) is provided at one end of the liquid-cooled exhaust component (120), and the exhaust channel (122) is respectively connected to the air inlet (123) and the exhaust hole (125); A sealing isolator (130) is arranged in the mounting groove (124), wherein a side of the sealing isolator (130) away from the air inlet (123) contacts a side of the battery cell (111) close to the explosion-proof valve (1111), and a heat insulation layer (131) is provided on a side of the sealing isolator (130) away from the explosion-proof valve (1111), and the heat insulation layer (131) is located in the mounting groove (124) and / or the air inlet (123).

2. The battery pack according to claim 1, wherein: The heat insulation layer (131) is located in the air inlet hole (123), and the circumferential edge of the heat insulation layer (131) is in contact with the hole wall of the air inlet hole (123).

3. The battery pack according to claim 1, wherein: The sealing isolator (130) is an elastic member. The thickness of the sealing isolator (130) in a natural state is T1 mm. The depth of the mounting groove (124) is T2 mm, satisfying the relationship: (T1-T2) / T1=K1, 0.05≤K1≤0.

3.

4. The battery pack according to claim 1, wherein: The orthographic projection of the portion of the explosion-proof valve (1111) facing the liquid-cooled exhaust member (120) and exposed relative to the battery core (111) on the liquid-cooled exhaust member (120) is located within the air inlet (123), and the orthographic projection area of the portion of the explosion-proof valve (1111) facing the liquid-cooled exhaust member (120) and exposed relative to the battery core (111) on the liquid-cooled exhaust member (120) is S1 mm. 2 The orthographic projection area of the air inlet (123) on the liquid-cooled exhaust member (120) is S2 mm. 2 , satisfying the relationship: S1 / S2=K2, 0.7≤K2≤1.

5. The battery pack according to claim 4, characterized in that: The orthographic projection area of the mounting groove (124) on the liquid-cooled exhaust component (120) is S3 mm. 2 , satisfying the relationship: S2 / S3=K3, 0.7≤K3≤0.

9.

6. The battery pack according to claim 1, wherein: An insulating thermally conductive adhesive layer (140) is provided between the battery core (111) and the liquid-cooled exhaust component (120), and the insulating thermally conductive adhesive layer (140) is in contact with a portion of the battery core (111) circumferentially surrounding the explosion-proof valve (1111) and a portion of the liquid-cooled exhaust component (120) circumferentially surrounding the mounting groove (124), respectively.

7. The battery pack according to claim 6, characterized in that: An annular glue overflow groove (126) is provided on one side of the liquid-cooled exhaust component (120) close to the explosion-proof valve (1111). The annular glue overflow groove (126) circumferentially surrounds the installation groove (124) and is spaced apart from the installation groove (124). The insulating thermal conductive glue layer (140) circumferentially surrounds the annular glue overflow groove (126).

8. The battery pack according to claim 7, characterized in that: The battery pack (100) further includes an insulating buffer component, the insulating thermally conductive adhesive layer (140) is provided with an escape hole, the insulating buffer component is located in the escape hole and is in contact with the battery core (111) and the liquid-cooling exhaust component (120) respectively.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The battery pack (100) has a first direction (X) and a second direction (Y), the second direction (Y) is perpendicular to the first direction (X), and the third direction (Z) is perpendicular to the first direction (X) and the second direction (Y). The liquid-cooled exhaust member (120) further has a liquid inlet (127) and a liquid outlet (128), the liquid inlet (127) and the liquid outlet (128) are spaced apart along the first direction (X) at one end of the liquid-cooled exhaust member (120) away from the exhaust hole (125), and the liquid-cooled flow channel (121) is respectively connected to the liquid inlet (127) and the liquid outlet (128); The liquid cooling channel (121) includes a plurality of sub-channels (1211) spaced apart along the first direction (X) and extending along the second direction (Y), the plurality of sub-channels (1211) being connected and having a serpentine projection on a plane shared by the first direction (X) and the second direction (Y), and the exhaust channel (122) extending along the second direction (Y) and spaced apart from the sub-channels (1211) along the first direction (X).

10. An electrical device, characterized in that: A battery pack (100) comprising any one of claims 1 to 9.

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