Energy storage equipment, battery cluster and battery pack

Abstract

The invention provides energy storage equipment, a battery cluster and a battery pack. The battery pack comprises a first battery cell group and a second battery cell group, the first battery cell group comprises a first battery cell; the second battery cell group comprises a second battery cell; the first battery cell is provided with a first end surface facing the second battery cell group, and the first end surface is provided with a first pressure release structure; the second battery cell is provided with a second end surface facing the first battery cell group, and the second end surface is provided with a second pressure release structure; the battery pack further comprises a supporting beam arranged between the first battery cell group and the second battery cell group, and a first pressure release channel is arranged in the supporting beam; and the first pressure release channel is communicated with the pressure release port of the first pressure release structure and the pressure release port of the second pressure release structure. And when the battery cells are subjected to thermal runaway, the first pressure release channel can quickly guide and release the pressure, so that the risk that the thermal runaway is diffused to the battery cells on the opposite side is reduced, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage devices, and specifically to an energy storage device, a battery cluster and a battery pack. Background Art

[0002] In traditional energy storage systems, in order to increase the overall capacity of the battery pack, a dual-cell configuration is usually adopted. However, this design has a significant safety hazard. When any cell experiences thermal runaway, the high temperature it generates will affect the adjacent cells through heat conduction, thereby causing the thermal runaway phenomenon to spread. This may not only damage the overall performance of the battery pack, but also pose a serious threat to safety. Summary of the invention

[0003] Multiple embodiments of the present application provide an energy storage device, a battery cluster, and a battery pack that can reduce the spread of thermal runaway.

[0004] On the one hand, an embodiment of the present application provides a battery pack, including a first battery cell group and a second battery cell group; the first battery cell group includes a first battery cell; the second battery cell group includes a second battery cell;

[0005] The first battery cell has a first end surface facing the second battery cell group, and the first end surface is provided with a first pressure release structure; the second battery cell has a second end surface facing the first battery cell group, and the second end surface is provided with a second pressure release structure;

[0006] The battery pack also includes a support beam arranged between the first battery cell group and the second battery cell group, and a first pressure release channel is arranged in the support beam; the first pressure release channel is connected to the pressure release port of the first pressure release structure and the pressure release port of the second pressure release structure.

[0007] In some embodiments, the side wall of the support beam is provided with a fluid blocking structure, which can block at least part of the high-temperature fluid sprayed from the first pressure release structure to the second battery cell group, and can also block at least part of the high-temperature fluid sprayed from the second pressure release structure to the first battery cell group.

[0008] In some embodiments, the support beam has a first side wall facing the first battery cell group and a second side wall facing the second battery cell group;

[0009] The fluid obstruction structure includes a plurality of channel inlets and a plurality of fluid obstructions disposed on the first side wall, and a plurality of channel inlets and a fluid obstruction disposed on the second side wall; wherein the plurality of channel inlets are separated by the fluid obstructions.

[0010] In some embodiments, a first side wall of the support beam is provided with a first thermal isolation structure, and the first thermal isolation structure is provided with an opening corresponding to the fluid blocking structure of the first side wall; a second side wall of the support beam is provided with a second thermal isolation structure, and the second thermal isolation structure is provided with an opening corresponding to the fluid blocking structure of the second side wall.

[0011] In some embodiments, the first thermal isolation structure and the second thermal isolation structure are epoxy boards or mica sheets; wherein the thickness of the first thermal isolation structure is not less than 2 mm, and the thickness of the second thermal isolation structure is not less than 2 mm.

[0012] In some embodiments, the first end surface is further provided with a liquid injection hole for the first battery cell; the second end surface is further provided with a liquid injection hole for the second battery cell.

[0013] In some embodiments, the battery pack also includes a first end plate and a second end plate, the support beam is connected between the first end plate and the second end plate, a second pressure release channel connected to the first pressure release channel is provided in the first end plate, and a third pressure release channel connected to the first pressure release channel is provided in the second end plate.

[0014] In some embodiments, the battery pack also includes a first connecting member for fixedly connecting the first end plate and the support beam, and the first connecting member is provided with a first transfer channel connecting the first pressure release channel and the second pressure release channel; the battery pack also includes a second connecting member for fixedly connecting the second end plate and the support beam, and the second connecting member is provided with a second transfer channel connecting the first pressure release channel and the third pressure release channel.

[0015] In some embodiments, the first connecting member includes a first plug-in ring plugged into the support beam, and the inner cavity of the first plug-in ring constitutes at least a portion of the first transfer channel;

[0016] The second connecting member includes a second plug-in ring plugged into the support beam, and an inner cavity of the second plug-in ring constitutes at least a portion of the second transfer channel.

[0017] In some embodiments, the second pressure release channel and the third pressure release channel extend in the same direction; and an extension direction of the first pressure release channel intersects with extension directions of the second pressure release channel and the third pressure release channel.

[0018] In some embodiments, the first end plate has a first end plate side wall facing the first battery cell group and the second battery cell group, and the first end plate side wall is in thermal contact with the first battery cell group and the second battery cell group, respectively; the second end plate has a second end plate side wall facing the first battery cell group and the second battery cell group, and the second end plate side wall is in thermal contact with the first battery cell group and the second battery cell group, respectively.

[0019] In some embodiments, the first pressure release channel includes a plurality of first sub-pressure release channels arranged side by side; and / or,

[0020] The interior of the second pressure release channel includes a plurality of second sub-pressure release channels arranged side by side; and / or,

[0021] The third pressure release channel includes a plurality of third sub-pressure release channels arranged side by side.

[0022] In some embodiments, the first battery cell has a third end surface facing away from the first end surface, and the second battery cell has a fourth end surface facing away from the second end surface;

[0023] The third end surface is provided with a positive terminal and a negative terminal of the first battery cell, and the fourth end surface is provided with a positive terminal and a negative terminal of the second battery cell.

[0024] In some embodiments, the battery pack further includes a liquid cooling plate, the liquid cooling plate includes a first cooling channel and a second cooling channel arranged side by side; the first cooling channel is in thermal contact with the first battery cell group, the first cooling channel includes a liquid inlet section connected to the liquid inlet and a liquid outlet section connected to the liquid outlet, the liquid inlet section of the first cooling channel is close to the third end face of the first battery cell, and the liquid outlet section of the first cooling channel is close to the first end face of the first battery cell;

[0025] The second cooling channel is in thermal contact with the second battery cell group. The second cooling channel includes a liquid inlet section connected to the liquid inlet and a liquid outlet section connected to the liquid outlet. The liquid inlet section of the second cooling channel is close to the fourth end face of the second battery cell, and the liquid outlet section of the second cooling channel is close to the second end face of the second battery cell.

[0026] On the other hand, the present application also provides a battery cluster, which includes the battery pack provided by the present application.

[0027] In some embodiments, a support base is disposed at the bottom of the battery cluster.

[0028] On the other hand, the present application also provides an energy storage device, which includes the battery pack provided by the present application, or includes the battery cluster provided by the present application.

[0029] In the multiple embodiments provided in the present application, a support beam is provided between the first battery cell group and the second battery cell group, and a first pressure release channel is provided on the support beam. When thermal runaway occurs in the battery cell, the first pressure release channel can quickly guide and release the pressure, thereby reducing the risk of thermal runaway spreading to the battery cell on the opposite side and improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a battery pack provided for one embodiment of the present application.

[0031] Figure 2 for Figure 1 Cross-sectional view of the battery pack along the MM direction.

[0032] Figure 3 for Figure 2 A partial enlarged view of middle A.

[0033] Figure 4 for Figure 1 Schematic diagram of the structure of the first battery cell.

[0034] Figure 5 for Figure 4 A schematic structural diagram of the first battery cell from another perspective.

[0035] Figure 6 for Figure 1 Schematic diagram of the structure of the middle support beam.

[0036] Figure 7 for Figure 6 A partial enlarged view of B.

[0037] Figure 8 for Figure 1 Schematic diagram of the structure of the battery pack after removing the first battery cell group and the second battery cell group.

[0038] Fig. 9 for Figure 8 A schematic structural diagram of another perspective of the structure shown.

[0039] Fig.10 for Figure 8 A cross-sectional view of the structure shown along the NN direction.

[0040] Fig.11 for Fig.10 A partial enlarged view of C in the middle.

[0041] Fig.12 for Fig.10 A partial enlarged view of D in the middle.

[0042] Fig.13 A schematic diagram of the structure of a battery cluster provided in one embodiment of the present application.

[0043] Description of Reference Numerals

[0044] 100, battery pack; 200, battery cluster; 110, first battery cell group; 111, first battery cell; 1111, first end surface; 1112, first pressure release structure; 1113, third end surface; 101, injection hole; 102, positive terminal; 103, negative terminal; 120, second battery cell group; 121, second battery cell; 1211, second end surface; 1212, second pressure release structure; 1213, fourth end surface; 130, support beam; 131, first pressure release channel; 131a, first sub-pressure release channel; 132, fluid blocking structure; 1321, channel entrance; 1322, fluid blocking portion; 133, first side wall; 134, second side wall; 140, first heat Isolation structure; 150, second thermal isolation structure; 160, first end plate; 161, second pressure release channel; 162, second sub-pressure release channel; 163, first end plate side wall; 170, second end plate; 171, third pressure release channel; 172, third sub-pressure release channel; 173, second end plate side wall; 180a, first connecting piece; 181a, first transfer channel; 182a, first plug-in ring; 180b, second connecting piece; 180b, second transfer channel; 180b, second plug-in ring; 190, liquid cooling plate; 191, first cooling channel; 192, second cooling channel; 193, liquid inlet section; 194, liquid outlet section; 104, support member; 210, support base. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0046] In the present application, the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show details of the local features.

[0047] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as those generally understood by those skilled in the art of the technical field of this application. The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit the scope of this application. The term "and / or" used in this application includes any and all combinations of one or more related listed items. The singular forms of "a", "above", and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0048] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0049] In the description of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "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 simplified description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0050] In the description of this application, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In the description of the present application, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0052] Researchers have discovered that in traditional battery packs, the pressure release structures of the two rows of battery cells are arranged relative to each other, causing the high-temperature fluid released from the pressure release port of the pressure release structure to spray directly to the pressure release structure on the opposite side, quickly transferring the high-temperature fluid to the battery cells on the opposite side, causing the temperature of the battery cells on the opposite side to rise sharply, resulting in the spread of thermal runaway.

[0053] Based on this, the researchers proposed a battery pack that has a support beam between the first battery cell group and the second battery cell group, and a first pressure release channel on the support beam. When a battery cell experiences thermal runaway, the first pressure release channel can quickly guide and release pressure, reducing the risk of thermal runaway spreading to the opposite battery cell and improving the safety of the battery pack.

[0054] See also Figures 1 to 12 The battery pack 100 provided in one embodiment of the present application includes a first battery cell group 110, a second battery cell group 120, and a support beam 130 disposed between the first battery cell group 110 and the second battery cell group 120; the first battery cell group 110 includes a first battery cell 111; the second battery cell group 120 includes a second battery cell 121; the first battery cell 111 has a first end surface 1111 facing the second battery cell group 120, and the first end surface 1111 is provided with a first pressure release structure 1112. The second battery cell 121 has a second end surface 1211 facing the first battery cell group 110, and the second end surface 1211 is provided with a second pressure release structure 1212. A first pressure release channel 131 is disposed in the support beam 130; the first pressure release channel 131 is connected to both the pressure release port of the first pressure release structure 1112 and the pressure release port of the second pressure release structure 1212. In other words, the high-temperature fluid released from the pressure release port of the first pressure release structure 1112 can flow into the first pressure release channel 131, and the high-temperature fluid released from the pressure release port of the second pressure release structure 1212 can flow into the first pressure release channel 131, thereby reducing the pressure in the inner compartment of the battery pack 100.

[0055] The battery pack 100 is provided with a support beam 130 between the first battery cell group 110 and the second battery cell group 120, and a first pressure release channel 131 is provided on the support beam 130. When a battery cell has thermal runaway, the first pressure release channel 131 can quickly guide and release the high-temperature fluid, thereby reducing the risk of thermal runaway spreading to the battery cell on the opposite side and improving the safety of the battery pack 100.

[0056] It can be understood that, in the description of the present application, unless otherwise clearly defined, the “battery cell” can be any one of the first battery cell and the second battery cell.

[0057] In addition, in the preparation process of a conventional battery pack, a battery module is first formed through a battery cell and other structures; then a battery pack is formed through one or more battery modules and other structures, and the preparation process is complicated. In this embodiment, in the preparation process of the battery pack 100, there is no need to form a battery module structure, and the battery pack 100 is directly formed through a battery cell and other structures, that is, de-modularization, and the preparation process is simple.

[0058] In addition, the risk of high-temperature fluid released from the pressure release port being conducted to the battery cell on the opposite side and causing the spread of thermal runaway is reduced, that is, the probability of thermal runaway of multiple battery cells in the battery pack 100 is reduced, thereby enhancing the stability of the overall structure of the battery pack 100.

[0059] Furthermore, the risk of thermal runaway spreading to the battery cell on the opposite side is reduced, so that the battery cell on the opposite side can release pressure normally and operate normally, reducing the risk of failure of the battery cell on the opposite side due to inability to release high-temperature fluid.

[0060] In this embodiment, the first battery cell 111 and the second battery cell 121 are both arranged sideways, that is, the side of the battery cell with a smaller area is located at the bottom, thereby reducing the footprint of the battery cell and the footprint of the battery pack 100.

[0061] In this embodiment, the side wall of the support beam 130 is provided with a fluid blocking structure 132. The fluid blocking structure 132 can block at least part of the high-temperature fluid sprayed from the first pressure release structure 1112 to the second battery cell group 120, and can also block at least part of the high-temperature fluid sprayed from the second pressure release structure 1212 to the first battery cell group 110, so as to further reduce the risk of thermal runaway spreading to the opposite battery cell.

[0062] More specifically, in this embodiment, the support beam 130 has a first side wall 133 facing the first battery cell group 110 and a second side wall 134 facing the second battery cell group 120. The fluid blocking structure 132 includes a plurality of channel inlets 1321 and a plurality of fluid blocking portions 1322 disposed on the first side wall 133, and a plurality of channel inlets 1321 and a plurality of fluid blocking portions 1322 disposed on the second side wall 134; wherein the plurality of channel inlets 1321 are separated by the fluid blocking portions 1322. The high-temperature fluid released from the pressure release port of the first pressure release structure 1112 can flow into the first pressure release channel 131 through the channel inlet 1321 on the first side wall 133; the high-temperature fluid released from the pressure release port of the second pressure release structure 1212 can flow into the first pressure release channel 131 through the channel inlet 1321 on the second side wall 134. The arrangement of the fluid obstruction portion 1322 on the first side wall 133 can reduce the overall speed of the high-temperature fluid released from the pressure release port of the first pressure release structure 1112 flowing into the first pressure release channel 131, thereby reducing the risk of the high-temperature fluid flowing into the first pressure release channel 131 flowing out through the channel inlet portion 1321 on the second side wall 134. Similarly, the arrangement of the fluid obstruction portion 1322 on the second side wall 134 can reduce the overall speed of the high-temperature fluid released from the pressure release port of the second pressure release structure 1212 flowing into the first pressure release channel 131, thereby reducing the risk of the high-temperature fluid flowing into the first pressure release channel 131 flowing out through the channel inlet portion 1321 on the first side wall 133.

[0063] In addition, the above-mentioned arrangement of the channel inlet portion 1321 and the fluid obstruction portion 1322 can reduce the risk of excessive local pressure.

[0064] In this embodiment, the channel inlet portion 1321 on the first side wall 133 is at least partially disposed to face the pressure release port of the first pressure release structure 1112 , so that the high-temperature fluid released by the first pressure release structure 1112 can quickly flow into the first pressure release channel 131 .

[0065] In this embodiment, the channel inlet portion 1321 on the second side wall 134 is at least partially disposed to face the pressure release port of the second pressure release structure 1212 , so that the high-temperature fluid released by the second pressure release structure 1212 can quickly flow into the first pressure release channel 131 .

[0066] In this embodiment, the channel entrances 1321 on the first side wall 133 are distributed in an array; the channel entrances 1321 on the second side wall 134 are distributed in an array. It can be understood that in other embodiments, the channel entrances on the first side wall and the second side wall are not limited to being distributed in an array, and can also be distributed in any other regular or irregular manner.

[0067] In this embodiment, the channel entrance 1321 is circular. It is understandable that in other embodiments, the channel entrance is not limited to being circular, but may also be in a regular or irregular shape such as a square or a diamond.

[0068] Optionally, the ratio of the size of the channel inlet 1321 to the size of the pressure release port of the first pressure release structure 1112 falls within the range of 0.01 to 0.05. Specifically, the ratio of the size of the channel inlet 1321 to the size of the pressure release port of the first pressure release structure 1112 can be 0.01, 0.02, 0.03, 0.04 or 0.05, etc.

[0069] Optionally, the ratio of the size of the channel inlet 1321 to the size of the pressure release port of the second pressure release structure 1212 falls within the range of 0.01 to 0.05. Specifically, the ratio of the size of the channel inlet 1321 to the size of the pressure release port of the second pressure release structure 1212 can be 0.01, 0.02, 0.03, 0.04 or 0.05, etc.

[0070] In this embodiment, the size, shape and arrangement of the channel entrance portion 1321 on the first side wall 133 are consistent with the size, shape and arrangement of the channel entrance portion 1321 on the second side wall 134. It can be understood that in other embodiments, the size, shape and arrangement of the channel entrance portion on the first side wall may be different from the size, shape and arrangement of the channel entrance portion on the second side wall.

[0071] It can be understood that the size of the channel entrance 1321 mentioned above refers to the opening area of ​​the channel entrance 1321; the size of the pressure release port also refers to the opening area of ​​the pressure release port.

[0072] The first side wall 133 of the support beam 130 is provided with a first heat isolation structure 140, and the first heat isolation structure 140 is provided with an opening corresponding to the fluid blocking structure 132 of the first side wall 133, so that the high-temperature airflow released by the first pressure release structure 1112 flows to the first pressure release channel 131. The second side wall 134 of the support beam 130 is provided with a second heat isolation structure 150, and the second heat isolation structure 150 is provided with an opening corresponding to the fluid blocking structure 132 of the second side wall 134, so that the high-temperature airflow released by the second pressure release structure 1212 flows to the first pressure release channel 131.

[0073] In addition, the first thermal isolation structure 140 has a heat insulating effect, thereby preventing the heat of the high-temperature fluid in the first pressure release channel 131 from being transferred to the first battery cell 111. The second thermal isolation structure 150 has a heat insulating effect, thereby preventing the heat of the high-temperature fluid in the first pressure release channel 131 from being transferred to the second battery cell 121.

[0074] In this embodiment, the first battery cell 111 abuts against the first thermal isolation structure 140, so the first thermal isolation structure 140 can limit the first battery cell 111 along the abutting direction. The second battery cell 121 abuts against the second thermal isolation structure 150, so the second thermal isolation structure 150 can limit the second battery cell 121 along the abutting direction.

[0075] In this embodiment, the first thermal isolation structure 140 is formed of an insulating material, and even if the first battery cells 111 are in contact with the first thermal isolation structure 140, a short circuit with other battery cells due to damage to the shell of the first battery cells 111 can be avoided. Similarly, the second thermal isolation structure 150 is formed of an insulating material, and even if the second battery cells 121 are in contact with the second thermal isolation structure 150, a short circuit with other battery cells due to damage to the shell of the second battery cells 121 can be avoided.

[0076] In addition, the first thermal isolation structure 140 and / or the second thermal isolation structure 150 are formed of insulating material, which can also prevent a short circuit between the shell of the first battery cell 111 and the shell of the second battery cell 121 .

[0077] Optionally, the first thermal isolation structure 140 is an epoxy board or a mica sheet; the second thermal isolation structure 150 is an epoxy board or a mica sheet. Both the epoxy board and the mica sheet have good insulation and heat insulation properties and are not prone to elastic deformation, which facilitates the support and positioning of the first battery cell 111 and the second battery cell 121.

[0078] Optionally, the thickness of the first thermal isolation structure 140 is not less than 2 mm, and the thickness of the second thermal isolation structure 150 is not less than 2 mm, which can better achieve thermal isolation, insulation and support positioning, and avoid excessive increase in the volume of the battery pack 100.

[0079] Optionally, the first end surface 1111 is further provided with a liquid injection hole 101 of the first battery cell 111; the second end surface 1211 is further provided with a liquid injection hole 101 of the second battery cell 121. It should be noted that, in this embodiment, the structure of the second battery cell 121 is the same as that of the first battery cell 111, so it is not specifically illustrated, and the illustrated structure of the first battery cell 111 is referred to. It can be understood that in some other embodiments, the structures of the first battery cell and the second battery cell may not be completely the same.

[0080] In this embodiment, the battery pack 100 further includes a first end plate 160 and a second end plate 170, and the support beam 130 is connected between the first end plate 160 and the second end plate 170. A second pressure release channel 161 communicating with the first pressure release channel 131 is provided in the first end plate 160; a third pressure release channel 171 communicating with the first pressure release channel 131 is provided in the second end plate 170. Therefore, the high-temperature airflow in the first pressure release channel 131 can flow out through the second pressure release channel 161 and the third pressure release channel 171.

[0081] In this embodiment, the battery pack 100 also includes a first connecting member 180a for fixedly connecting the first end plate 160 and the support beam 130, and the first connecting member 180a is provided with a first transfer channel 181a connecting the first pressure release channel 131 and the second pressure release channel 161; the battery pack 100 also includes a second connecting member 180b for fixedly connecting the second end plate 170 and the support beam 130, and the second connecting member 180b is provided with a second transfer channel 180b connecting the first pressure release channel 131 and the third pressure release channel 171.

[0082] Specifically, the first connector 180a includes a first plug-in ring 182a plugged into the support beam 130, and the inner cavity of the first plug-in ring 182a constitutes a first transfer channel 181a. The first plug-in ring 182a is used to achieve a fixed connection between the first connector 180a and the end of the support beam 130, and will not affect the outflow of air from the end of the support beam 130.

[0083] The second connector 180b includes a second plug ring 180b plugged into the support beam 130, and the inner cavity of the second plug ring 180b constitutes part of the second transfer channel 180b. The second plug ring 180b is used to achieve a fixed connection between the second connector 180b and the end of the support beam 130 without affecting the outflow of air from the end of the support beam 130.

[0084] Optionally, a hollow structure is provided on the side wall of the first plug-in ring 182a to reduce the weight and material consumption of the first connecting member 180a.

[0085] Optionally, a hollow structure is provided on the side wall of the second plug-in ring 180b to reduce the weight and material consumption of the second connecting member 180b.

[0086] It is understandable that the hollow structures on the first plug-in ring 182a are all arranged to avoid the outer edge where it is connected to the support beam 130, so as to prevent the high-temperature fluid in the first transfer channel 181a from leaking through the position where the first plug-in ring 182a and the first transfer channel 181a are connected. The hollow structures on the second plug-in ring 180b are all arranged to avoid the outer edge where it is connected to the support beam 130, so as to prevent the high-temperature fluid in the first transfer channel 181a from leaking through the position where the second plug-in ring 180b and the first transfer channel 181a are connected.

[0087] In this embodiment, the second pressure release channel 161 and the third pressure release channel 171 extend in the same direction; and the extension direction of the first pressure release channel 131 intersects with the extension directions of the second pressure release channel 161 and the third pressure release channel 171 .

[0088] More specifically, in this embodiment, the extension direction of the first pressure release channel 131 is perpendicular to the extension direction of the second pressure release channel 161. It is understandable that in other embodiments, the extension direction of the first pressure release channel 131 and the extension direction of the second pressure release channel 161 are not limited to being perpendicular, but may also be parallel, or have an acute or obtuse angle.

[0089] The first end plate 160 has a first end plate side wall 163 facing the first battery cell group 110 and the second battery cell group 120, and the first end plate side wall 163 is in thermal contact with the first battery cell group 110 and the second battery cell group 120 respectively; the second end plate 170 has a second end plate side wall 173 facing the first battery cell group 110 and the second battery cell group 120, and the second end plate side wall 173 is in thermal contact with the first battery cell group 110 and the second battery cell group 120 respectively. Therefore, heat dissipation can be carried out through heat conduction between the first end plate 160 and the second end plate 170, thereby improving heat dissipation efficiency.

[0090] Optionally, the material of the first end plate 160 and the second end plate 170 is aluminum. It is understandable that in other embodiments, the material of the first end plate 160 and the second end plate 170 is not limited to aluminum, but can also be any other heat-conducting and supportive material.

[0091] In this embodiment, the interior of the first pressure release channel 131 includes a plurality of side-by-side first sub-pressure release channels 131a. When the high-temperature airflow is less, it can flow out quickly through one of the first sub-pressure release channels 131a. Specifically, the number of the first sub-pressure release channels 131a is three. The three first sub-pressure release channels 131a are arranged side by side, and the fluid obstruction structure 132 is arranged corresponding to the first sub-pressure release channel 131a in the middle position. Therefore, when there is more high-temperature fluid, the heat can be dissipated to the first sub-pressure release channels 131a on both sides respectively, thereby improving the heat dissipation efficiency.

[0092] It can be understood that, in some other embodiments, the number of the first sub-pressure release channels 131a is not limited to three, but can also be two or more than three.

[0093] In this embodiment, the interior of the second pressure release channel 161 includes a plurality of side-by-side second sub-pressure release channels 162. When the high-temperature airflow is less, it can flow out quickly through one of the second sub-pressure release channels 162. Specifically, the number of the second sub-pressure release channels 162 is three. The three second sub-pressure release channels 162 are arranged side by side, and the second sub-pressure release channel 162 in the middle position is arranged corresponding to the first sub-pressure release channel 131a in the middle position. Therefore, when there is more high-temperature fluid, the heat can be dissipated to the second sub-pressure release channels 162 on both sides respectively, thereby improving the heat dissipation efficiency.

[0094] It can be understood that, in some other embodiments, the number of the second sub-pressure release channels 162 is not limited to three, but can also be two or more than three.

[0095] In this embodiment, the interior of the third pressure release channel 171 includes a plurality of third sub-pressure release channels 172 arranged side by side. When the high-temperature airflow is small, it can flow out quickly through one of the third sub-pressure release channels 172. Specifically, the number of the third sub-pressure release channels 172 is three. The three third sub-pressure release channels 172 are arranged side by side, and the third sub-pressure release channel 172 in the middle position is arranged corresponding to the first sub-pressure release channel 131a in the middle position. Therefore, when there is a lot of high-temperature fluid, the heat can be dissipated to the third sub-pressure release channels 172 on both sides respectively, thereby improving the heat dissipation efficiency.

[0096] It can be understood that, in some other embodiments, the number of the third sub-pressure release channels 172 is not limited to three, but can also be two or more than three.

[0097] In this embodiment, the first battery cell 111 has a third end face 1113 facing away from the first end face 1111, and the third end face 1113 is provided with the positive terminal 102 and the negative terminal 103 of the first battery cell 111. The positive terminal 102 and the negative terminal 103 of the first battery cell 111 and the first pressure release structure 1112 are respectively located on different end faces of the first battery cell 111, thereby preventing the high-temperature airflow released by the first pressure release structure 1112 from causing a short circuit between the positive terminal 102 and the negative terminal 103 of the first battery cell 111.

[0098] It can be understood that in some other embodiments, the positive terminal and the negative terminal of the first battery cell can also be located on other surfaces of the first battery cell that are different from the first end face, and the high-temperature airflow released by the first pressure release structure can be avoided to cause a short circuit between the positive terminal and the negative terminal of the first battery cell.

[0099] In this embodiment, the second battery cell 121 has a fourth end face 1213 facing away from the second end face 1211; the fourth end face 1213 is provided with the positive terminal 102 and the negative terminal 103 of the second battery cell 121. The positive terminal 102 and the negative terminal 103 of the second battery cell 121 and the second pressure release structure 1212 are respectively located on different end faces of the second battery cell 121, thereby preventing the high-temperature airflow released by the second pressure release structure 1212 from causing a short circuit between the positive terminal 102 and the negative terminal 103 of the second battery cell 121.

[0100] It can be understood that, in some other embodiments, the positive terminal 102 and the negative terminal 103 of the second battery cell 121 can also be located on other surfaces of the second battery cell 121 that are different from the second end face 1211, and the high-temperature airflow released by the second pressure release structure 1212 can be avoided, which would cause a short circuit between the positive terminal 102 and the negative terminal 103 of the second battery cell 121.

[0101] In this embodiment, the battery pack 100 further includes a liquid cooling plate 190, which includes a first cooling channel 191 and a second cooling channel 192 arranged side by side; the first cooling channel 191 is in thermal contact with the first battery group 110, and the first cooling channel 191 includes a liquid inlet section 193 connected to the liquid inlet and a liquid outlet section 194 connected to the liquid outlet, the liquid inlet section 193 of the first cooling channel 191 is close to the third end face 1113 of the first battery 111, and the liquid outlet section 194 of the first cooling channel 191 is close to the first end face 1111 of the first battery 111. The temperature of the cooling fluid in the liquid inlet section 193 of the first cooling channel 191 is relatively low, which can better cool the positive terminal 102 and the negative terminal 103 of the first battery 111. It can be understood that the side of the first battery 111 where the first pressure release structure 1112 is set can dissipate heat through the first pressure release channel 131, and can also be better cooled.

[0102] The second cooling channel 192 is in thermal contact with the second battery cell group 120. The second cooling channel 192 includes a liquid inlet section 193 connected to the liquid inlet and a liquid outlet section 194 connected to the liquid outlet. The liquid inlet section 193 of the second cooling channel 192 is close to the fourth end face 1213 of the second battery cell 121, and the liquid outlet section 194 of the second cooling channel 192 is close to the second end face 1211 of the second battery cell 121. The temperature of the cooling fluid in the liquid inlet section 193 of the second cooling channel 192 is relatively low, which can better cool the positive terminal 102 and the negative terminal 103 of the second battery cell 121. It can be understood that the side of the second battery cell 121 where the second pressure release structure 1212 is set can dissipate heat through the first pressure release channel 131, and can also be better cooled.

[0103] In this embodiment, one end of the liquid cooling plate 190 extends out of the first end plate 160, and the liquid inlet and outlet of the liquid cooling plate 190 are both provided at the extended portion of the liquid cooling plate 190, thereby avoiding affecting the thermal contact between the liquid cooling plate 190 and the battery cell.

[0104] In this embodiment, the first end plate 160 can be fixedly connected to the first end plate 160 of another battery pack, and the second end plate 170 can be fixedly connected to the second end plate 170 of another battery pack, thereby realizing stacking of two battery packs with a simple structure.

[0105] In this embodiment, the liquid cooling plate 190 can be clamped and fixed by the first end plate 160, the second end plate 170, and the first end plate 160 and the second end plate 170 of another battery pack, so that the structure of the liquid cooling plate 190 is simpler.

[0106] In this embodiment, the battery pack 100 further includes two support members 104. They are disposed on the bottom sides of the first battery cell group 110 and the second battery cell group 120 to support the first battery cell group 110 and the second battery cell group 120 and reduce the pressure on the liquid cooling plate 190. In addition, the two support members 104 are respectively located on both sides of the liquid cooling plate 190 and limit the liquid cooling plate 190 to prevent the liquid cooling plate 190 from moving toward the support members 104.

[0107] Optionally, the material of the support beam 130 is aluminum. It is understood that in other embodiments, the material of the support beam is not limited to aluminum, and can also be formed of other materials.

[0108] See also Fig.13 The battery cluster 200 provided in one embodiment of the present application includes a battery pack 100. The specific structure of the battery pack 100 is described above, and Figures 1 to 12 , I will not go into details here.

[0109] The battery cluster 200 has a support beam 130 between the first battery cell group 110 and the second battery cell group 120, and a first pressure release channel 131 is provided on the support beam 130. When a battery cell has thermal runaway, the first pressure release channel 131 can quickly guide and release the pressure, thereby reducing the risk of thermal runaway spreading to the opposite battery cell, improving the safety of the battery pack, that is, improving the safety of the battery cluster.

[0110] It can be understood that, in some other embodiments, the battery pack in the battery cluster 200 may also be the battery pack provided in other embodiments of the present application.

[0111] In this embodiment, a support base 210 is disposed at the bottom of the battery cluster 200 to support and position the battery pack 100 , thereby facilitating the transportation and storage of the battery cluster 200 .

[0112] In this embodiment, there are two battery packs 100. It is understandable that in other embodiments, according to usage requirements, the number of battery packs is not limited to two, but may be one or more than two, which can be set according to specific needs and is not limited to this.

[0113] An embodiment of the present application also provides an energy storage device, including the battery pack provided in the present application.

[0114] An embodiment of the present application further provides an energy storage device, including the battery cluster provided in the present application.

[0115] The energy storage device has a support beam between the first battery cell group and the second battery cell group, and a first pressure release channel is arranged on the support beam. When a battery cell has thermal runaway, the first pressure release channel can quickly guide and release the pressure, reducing the risk of thermal runaway spreading to the opposite battery cell, improving the safety of the battery pack, that is, improving the safety of the energy storage device.

[0116] It can be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0117] It can be understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited to this.

[0118] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method implementation methods and will not be repeated here.

[0119] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery pack, characterized in that: It includes a first battery cell group and a second battery cell group; the first battery cell group includes a first battery cell; the second battery cell group includes a second battery cell; The first battery cell has a first end surface facing the second battery cell group, and the first end surface is provided with a first pressure release structure; the second battery cell has a second end surface facing the first battery cell group, and the second end surface is provided with a second pressure release structure; The battery pack also includes a support beam arranged between the first battery cell group and the second battery cell group, and a first pressure release channel is arranged in the support beam; the first pressure release channel is connected to the pressure release port of the first pressure release structure and the pressure release port of the second pressure release structure.

2. The battery pack according to claim 1, characterized in that: The side wall of the support beam is provided with a fluid blocking structure, which can block at least part of the high-temperature fluid sprayed from the first pressure release structure to the second battery cell group, and can also block at least part of the high-temperature fluid sprayed from the second pressure release structure to the first battery cell group.

3. The battery pack according to claim 2, characterized in that: The support beam has a first side wall facing the first battery cell group and a second side wall facing the second battery cell group; The fluid obstruction structure includes a plurality of channel inlets and a plurality of fluid obstructions disposed on the first side wall, and a plurality of channel inlets and a fluid obstruction disposed on the second side wall; wherein the plurality of channel inlets are separated by the fluid obstructions.

4. The battery pack according to claim 3, characterized in that: The first side wall of the support beam is provided with a first thermal isolation structure, and the first thermal isolation structure is provided with an opening corresponding to the fluid blocking structure of the first side wall; the second side wall of the support beam is provided with a second thermal isolation structure, and the second thermal isolation structure is provided with an opening corresponding to the fluid blocking structure of the second side wall.

5. The battery pack according to claim 4, characterized in that: The first thermal isolation structure and the second thermal isolation structure are epoxy boards or mica sheets; wherein the thickness of the first thermal isolation structure is not less than 2 mm, and the thickness of the second thermal isolation structure is not less than 2 mm.

6. The battery pack according to claim 1, characterized in that: The first end surface is also provided with a liquid injection hole for the first battery cell; the second end surface is also provided with a liquid injection hole for the second battery cell.

7. The battery pack according to claim 1, characterized in that: The battery pack also includes a first end plate and a second end plate, the support beam is connected between the first end plate and the second end plate, the first end plate is provided with a second pressure release channel connected to the first pressure release channel; the second end plate is provided with a third pressure release channel connected to the first pressure release channel.

8. The battery pack according to claim 7, characterized in that: The battery pack further includes a first connecting member for fixedly connecting the first end plate and the support beam, and the first connecting member is provided with a first transfer channel connecting the first pressure release channel and the second pressure release channel; The battery pack also includes a second connecting member for fixedly connecting the second end plate and the support beam, and the second connecting member is provided with a second transfer channel connecting the first pressure release channel and the third pressure release channel.

9. The battery pack according to claim 8, characterized in that: The first connecting member comprises a first plug-in ring plugged into the support beam, and the inner cavity of the first plug-in ring constitutes at least a part of the first transfer channel; The second connecting member includes a second plug-in ring plugged into the support beam, and an inner cavity of the second plug-in ring constitutes at least a portion of the second transfer channel.

10. The battery pack according to claim 7, characterized in that: The second pressure release channel and the third pressure release channel extend in the same direction; and an extending direction of the first pressure release channel intersects with an extending direction of the second pressure release channel and the third pressure release channel.

11. The battery pack according to claim 7, characterized in that: The first end plate has a first end plate side wall facing the first battery cell group and the second battery cell group, and the first end plate side wall is in thermal contact with the first battery cell group and the second battery cell group respectively; the second end plate has a second end plate side wall facing the first battery cell group and the second battery cell group, and the second end plate side wall is in thermal contact with the first battery cell group and the second battery cell group respectively.

12. The battery pack according to claim 7, characterized in that: The first pressure release channel includes a plurality of first sub-pressure release channels arranged side by side; and / or, The interior of the second pressure release channel includes a plurality of second sub-pressure release channels arranged side by side; and / or, The third pressure release channel includes a plurality of third sub-pressure release channels arranged side by side.

13. The battery pack according to claim 1, characterized in that: The first battery cell has a third end surface facing away from the first end surface, and the second battery cell has a fourth end surface facing away from the second end surface; The third end surface is provided with a positive terminal and a negative terminal of the first battery cell, and the fourth end surface is provided with a positive terminal and a negative terminal of the second battery cell.

14. The battery pack according to claim 13, characterized in that: The battery pack further includes a liquid cooling plate, the liquid cooling plate including a first cooling channel and a second cooling channel arranged side by side; the first cooling channel is in thermal contact with the first battery cell group, the first cooling channel includes a liquid inlet section connected to the liquid inlet and a liquid outlet section connected to the liquid outlet, the liquid inlet section of the first cooling channel is close to the third end face of the first battery cell, and the liquid outlet section of the first cooling channel is close to the first end face of the first battery cell; The second cooling channel is in thermal contact with the second battery cell group. The second cooling channel includes a liquid inlet section connected to the liquid inlet and a liquid outlet section connected to the liquid outlet. The liquid inlet section of the second cooling channel is close to the fourth end face of the second battery cell, and the liquid outlet section of the second cooling channel is close to the second end face of the second battery cell.

15. A battery cluster, characterized in that: The battery cluster comprises the battery pack according to any one of claims 1 to 14.

16. The battery cluster according to claim 15, characterized in that: A supporting base is arranged at the bottom of the battery cluster.

17. An energy storage device, characterized in that: The battery pack comprises the battery pack according to any one of claims 1 to 14, or the battery cluster comprises the battery cluster according to claim 15 or 16.

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