Battery pack and energy storage device

Abstract

The utility model discloses a battery pack and energy storage equipment, and relates to the technical field of heat dissipation of battery packs. The battery pack comprises a battery module and a box body assembly, wherein the battery module comprises a plurality of single batteries; the box body assembly is used for accommodating the battery module and comprises a box body, a liquid cooling plate and an end plate; the box body comprises a bottom plate and side plates, the side plates are arranged on the periphery of the bottom plate, a containing cavity is defined by the side plates and the bottom plate, and the battery module is located in the containing cavity; the end plate is arranged on the bottom plate, one end of the liquid cooling plate is connected with the side plate, the other end of the liquid cooling plate is connected with the end plate, the end plate is provided with a first cavity and a second cavity which are isolated from each other, the second cavity is communicated with the liquid cooling plate, a heat insulation broken bridge is arranged in the first cavity, and the heat insulation broken bridge is arranged in the second cavity. The heat conductivity coefficient of the heat insulation broken bridges is lower than that of the box body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat dissipation of battery packs, and in particular to a battery pack and an energy storage device. BACKGROUND

[0002] At present, in order to achieve efficient heat dissipation of the battery pack, a liquid cooling structure is generally used. However, since the structural material of the battery pack is generally a metal material with good thermal conductivity, external heat is easily transferred to the liquid cooling structure, thereby reducing the heat dissipation effect of the liquid cooling structure.

[0003] The liquid cooling structure not only occupies a large installation space, but also makes the volume of the battery pack larger and the structural strength of the battery pack lower. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery pack and an energy storage device, which can reduce the heat transferred from the outside to the liquid cooling plate and ensure the heat dissipation effect of the liquid cooling plate.

[0005] The battery pack of the embodiments of the present application comprises:

[0006] a battery module comprising a plurality of battery monomers;

[0007] a box assembly for accommodating the battery module, the box assembly comprising a box, a liquid cooling plate and an end plate. The box comprises a bottom plate and a side plate arranged around the bottom plate, and the side plate and the bottom plate form a containing cavity, and the battery module is located in the containing cavity;

[0008] The end plate is arranged on the bottom plate, one end of the liquid cooling plate is connected to the side plate, and the other end is connected to the end plate. The end plate is provided with an isolated first cavity and a second cavity, the second cavity is in communication with the liquid cooling plate, and the first cavity is provided with a heat insulation broken bridge, and the thermal conductivity of the heat insulation broken bridge is lower than that of the box.

[0009] The energy storage device of the present application comprises a cabinet body and the battery pack of the above-mentioned embodiments, and the cabinet body comprises a plurality of battery compartments. The battery pack is arranged in the battery compartment.

[0010] In the battery pack and the energy storage device of the embodiments of the present application, a liquid cooling plate is arranged in the box body, and then the two ends of the liquid cooling plate are connected to the side plate and the end plate respectively. The end plate is provided with a first cavity and a second cavity arranged in isolation. The second cavity is in communication with the liquid cooling plate to perform liquid cooling. The air layer formed by the first cavity itself can be used to block the transmission of external heat to the liquid cooling plate. The first cavity is further provided with a heat insulation broken bridge having a lower thermal conductivity than the box body. Not only can the heat insulation effect be ensured, but also when the end plate is subjected to liquid cooling, the second cavity can be well supported in the case of thermal expansion and contraction, so as to avoid damage to the second cavity and ensure the stability of liquid cooling.

[0011] Additional aspects and advantages of the embodiments of the present application will be in part apparent and in part pointed out hereinafter in the description of the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0012] The above and / or additional aspects and advantages of the embodiments of the present application will become apparent and be readily appreciated from the description of the embodiments, taken in conjunction with the following drawings in which:

[0013] Figure 1 is a perspective exploded structural schematic view of a battery pack according to some embodiments of the present application.

[0014] Figure 2 is a perspective structural schematic view of a box body assembly according to some embodiments of the present application.

[0015] Figure 3 is a first planar schematic view of a box body assembly according to some embodiments of the present application.

[0016] Figure 4 is a second planar schematic view of a box body assembly according to some embodiments of the present application.

[0017] Figure 5 is a cross-sectional schematic view along the section line V-V of Figure 3 and

[0018] Figure 6 is an enlarged schematic view of the area a in Figure 5 .

[0019] Figure 7 is a cross-sectional schematic view along the section line VII-VII of Figure 3 .

[0020] Figure 8 is an enlarged schematic view of the area b in Figure 7 .

[0021] Figure 9 is a planar schematic view of an energy storage device according to some embodiments of the present application.

[0022] Main element label:

[0023] Battery pack 100, box assembly 10, box 11, bottom plate 111, side plate 112, water inlet 1125, water outlet 1126, mounting hole 1127, front beam 1121, rear beam 1123, left beam 1124, right beam 1122, accommodating cavity 113, sub-accommodating cavity 1131, liquid cooling plate 12, first flow channel 121, first water inlet flow channel 1211, first water outlet flow channel 1212, end plate 13, second flow channel 131, second water inlet flow channel 1311, second water outlet flow channel 1312, first cavity 1321 and second cavity 1322, heat insulation broken bridge 133, reinforcing member 14; battery module 20, battery monomer 21; box cover 30;

[0024] Cabinet 200, battery cabin 201, support 210, guide rail 220;

[0025] Energy storage device 1000. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be further described below with reference to the drawings. The same or similar reference numerals are used throughout the drawings to represent the same or similar elements or elements having the same or similar functions.

[0027] In addition, the embodiments of the present application described below in conjunction with the drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as a limitation of the present application.

[0028] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0029] Please refer to Figures 1 to 4 The battery pack 100 of the embodiments of the present application comprises a battery module 20 and a box assembly 10.

[0030] The battery module 20 comprises a plurality of battery monomers 21; the box assembly 10 is used to accommodate the battery module 20, and the box assembly 10 comprises a box 11, a liquid cooling plate 12 and an end plate 13. The box 11 comprises a bottom plate 111 and a side plate 112, the side plate 112 is arranged around the bottom plate 111, and the side plate 112 and the bottom plate 111 enclose a containing cavity 113, and the battery module 20 is located in the containing cavity 113; the end plate 13 is arranged on the bottom plate 111, one end of the liquid cooling plate 12 is connected with the side plate 112, and the other end is connected with the end plate 13; the end plate 13 is provided with an isolated first cavity 1321 and a second cavity 1322, the second cavity 1322 is communicated with the liquid cooling plate 12, and the first cavity 1321 is provided with a heat insulation broken bridge 133, and the thermal conductivity of the heat insulation broken bridge 133 is lower than that of the box 11.

[0031] The battery pack 100 of the present application is provided with the liquid cooling plate 12 in the box 11, and then the two ends of the liquid cooling plate 12 are connected with the side plate 112 and the end plate 13 respectively, the end plate 13 is provided with the isolated first cavity 1321 and the second cavity 1322, the second cavity 1322 is communicated with the liquid cooling plate 12 for liquid cooling, the air layer formed by the first cavity 1321 itself can be used to block the transmission of external heat to the liquid cooling plate 12, and the first cavity 1321 is further provided with the heat insulation broken bridge 133 with a thermal conductivity lower than that of the box 11, which not only ensures the heat insulation effect, but also plays a good supporting role on the second cavity 1322 in the case of thermal expansion and contraction of the end plate 13 for liquid cooling, so as to avoid damage of the second cavity 1322 and ensure the stability of liquid cooling.

[0032] Please refer to Figures 1 to 4 The battery pack 100 of the present application comprises a battery module 20 and a box assembly 10. The battery module 20 comprises a plurality of battery monomers 21; the box assembly 10 is used to accommodate the battery module 20, and the box assembly 10 comprises a box 11 and a plurality of liquid cooling plates 12. The box 11 comprises a bottom plate 111 and a side plate 112, the side plate 112 is arranged around the bottom plate 111, the side plate 112 and the bottom plate 111 enclose a containing cavity 113, the battery module 20 is located in the containing cavity 113, and the plurality of liquid cooling plates 12 are arranged at intervals on the bottom plate 111 and connected with the side plate 112, so as to divide the containing cavity 113 into a plurality of sub-containing cavities 1131, and the sub-containing cavities 1131 are used to accommodate one or more battery monomers 21.

[0033] The battery module 20 comprises a plurality of battery monomers 21, the plurality of battery monomers 21 are combined into the battery module 20 in series, parallel or series-parallel mixed manner, and the battery module 20 comprises one or more, and the one or more battery modules 20 are further packaged and integrated to form the battery pack 100.

[0034] The battery monomer 21 is modularly designed, facilitating replacement or maintenance of the battery monomer 21 when any battery monomer 21 fails (such as hardware failure, thermal runaway, etc.). The battery module 20 forms a power supply circuit with an external load through the total positive and total negative, thereby performing power supply. The battery module 20 is the core component of the energy storage device, used for energy storage and power supply.

[0035] Optionally, the battery monomer 21 is a rectangular body, and the plurality of battery monomers 21 are arranged in a rectangular array. In this way, the plurality of battery monomers 21 are arranged more compactly, facilitating miniaturization of the energy storage device 100.

[0036] Optionally, the battery monomer 21 includes a battery shell, a battery cell, and an explosion-proof valve. The battery cell is arranged in the battery shell, and the explosion-proof valve is arranged in the battery shell. When the battery cell experiences thermal runaway, overcharging, etc., reaction gas will be generated, and the pressure in the battery shell will continuously rise. The explosion-proof valve is used for pressure relief to avoid explosion of the battery monomer 21.

[0037] The box assembly 10 is used to accommodate the battery module 20. The box assembly 10 includes a box 11 and a plurality of liquid cooling plates 12.

[0038] The box 11 includes a bottom plate 111 and a side plate 112. The side plate 112 is arranged on the bottom plate 111, and the side plate 112 and the bottom plate 111 enclose a containing cavity 113. The battery module 20 is located in the containing cavity 113.

[0039] Optionally, the side plate 112 includes a front edge beam 1121 and a rear edge beam 1123 arranged opposite to each other, and a left edge beam 1124 and a right edge beam 1122 arranged opposite to each other. The two ends of the front edge beam 1121 are respectively connected to one end of the left edge beam 1124 and the right edge beam 1122. The two ends of the rear edge beam 1123 are respectively connected to the other end of the left edge beam 1124 and the right edge beam 1122 away from the front edge beam 1121. The liquid cooling plates 12 are arranged along the front-rear direction.

[0040] In this way, two pairs of oppositely arranged edge beams can form a rectangular battery pack 100, facilitating the accommodation of more rectangular battery monomers 21.

[0041] Optionally, the box assembly 10 is integrally formed.

[0042] That is, the plurality of liquid cooling plates 12 can be integrally formed with the box 11, thereby further improving the structural strength of the box assembly 10.

[0043] The plurality of liquid cooling plates 12 are arranged on the bottom plate 111 in a spaced manner and connected to the side plate 112.

[0044] The plurality of liquid cooling plates 12 are arranged at intervals on the bottom plate 111 to divide the accommodation cavity 113 into a plurality of sub-accommodation cavities 1131. For example, two adjacent liquid cooling plates 12 form one sub-accommodation cavity 1131, and the two liquid cooling plates 12 arranged at the edges form one sub-accommodation cavity with the corresponding side plate 112. The sub-accommodation cavities 1131 are used to accommodate one or more battery monomers 21.

[0045] Optionally, the plurality of liquid cooling plates 12 extend in the front-rear direction (e.g., from the front side beam 1121 to the rear side beam 1123), thereby dividing the accommodation cavity 113 into a plurality of sub-accommodation cavities 1131 extending in the front-rear direction.

[0046] The liquid cooling plate 12 is a device for heat dissipation, mainly through the flow of liquid to take away heat. Its working principle is based on the convection heat transfer in heat transfer. When the heat generating element (such as a battery) is in contact with the liquid cooling plate 12, heat is conducted to the liquid cooling plate 12, and the cooling liquid (such as water, glycol solution, or special coolant) inside the liquid cooling plate 12 circulates under the drive of the pump. The cooling liquid absorbs heat and carries it to the heat exchanger and other heat dissipation components, thereby effectively dissipating heat and maintaining the heat generating element within a suitable operating temperature range.

[0047] Optionally, the liquid cooling plate 12 can be made of the same material as the box body 11, thereby facilitating one-piece molding. For example, the liquid cooling plate 12 and the box body 11 are made of a material with a high thermal conductivity, such as an aluminum alloy material, which not only has a high thermal conductivity, but also has a relatively light weight and a high structural strength.

[0048] In some embodiments, the battery pack 100 further includes a box cover 30 arranged on the box body 11 to seal the accommodation cavity 113 and achieve dust and water resistance of the battery pack 100.

[0049] The battery pack 100 of the present application divides the accommodation cavity 113 of the box body 11 into a plurality of sub-accommodation cavities 1131 by arranging a plurality of liquid cooling plates 12 at intervals in the box body 11, and the liquid cooling plates 12 accommodate the battery monomers 21. The liquid cooling plates 12 are arranged in the gaps between the battery monomers 21, thereby reducing the installation space occupied by the liquid cooling plates 12.

[0050] Furthermore, compared with the liquid cooling plate 12 arranged at the bottom of the battery module 20 and only contacting the bottom of each battery monomer 21, the contact area is small and the heat dissipation effect is poor. In contrast, the liquid cooling plate 12 itself includes a plurality of liquid cooling plates 12, and the two sides of the liquid cooling plate 12 contact the side plates 112 of the adjacent battery monomers 21, thereby greatly improving the contact area and facilitating the improvement of the heat dissipation effect of the battery pack 100.

[0051] In addition, since the liquid cooling plate 12 can be arranged on the bottom plate 111 of the cabinet 11 and connected to the side plate 112, the liquid cooling plate 12 can play a role similar to a reinforcing beam, thereby strengthening the structural strength of the cabinet 11.

[0052] Please refer to Figure 5 In some embodiments, the cabinet assembly 10 further comprises an end plate 13, the liquid cooling plate 12 is provided with a first flow channel 121, the end plate 13 is provided with a second flow channel 131, one end of the liquid cooling plate 12 is connected to the side plate 112 (specifically, the rear beam 1123), and the other end is connected to the end plate 13. The second flow channel 131 is in communication with each first flow channel 121.

[0053] The end plate 13 is used to realize the circulating flow of the cooling liquid of each liquid cooling plate 12. The end plate 13 can be arranged near the front beam 1121 or the rear beam 1123. Taking the case where the end plate 13 is arranged near the front beam 1121 as an example, one end of each liquid cooling plate 12 is connected to the rear beam 1123, and the other end is connected to the end plate 13. The end plate 13 is arranged near the front beam 1121 and is spaced apart from the front beam 1121. The two ends of the end plate 13 are connected to the left beam 1124 and the right beam 1122, respectively. The end plate 13 is located between the front beam 1121 and the rear beam 1123. The extension direction of the end plate 13 is parallel to the extension direction of the front beam 1121 and perpendicular to the extension direction of the left beam 1124.

[0054] The liquid cooling plate 12 is provided with a first flow channel 121, and the end plate 13 is provided with a second flow channel 131. The end plate 13 can be arranged in the left-right direction (such as from the left beam 1124 to the right beam 1122), so that the second flow channel 131 is in communication with each first flow channel 121 of the liquid cooling plate 12.

[0055] The side plate 112 of the cabinet 11 is provided with a water inlet 1125 and a water outlet 1126, and the second flow channel 131 is in communication with the water inlet 1125 and the water outlet 1126. The cooling liquid enters the second flow channel 131 of the end plate 13 from the water inlet 1125, then flows from the second flow channel 131 into the first flow channel 121 of each liquid cooling plate 12, and then flows back from the first flow channel 121 to the second flow channel 131, so as to flow out from the water outlet 1126, thereby realizing the circulating flow of the cooling liquid.

[0056] Compared with the connection between a plurality of liquid cooling plates 12 through a plurality of connecting pipes, such as one liquid cooling plate 12 having one inlet and one outlet, two liquid cooling connectors, the number of liquid cooling connectors is large, the installation operation is difficult, the cost is high, the sealing difficulty is large, and the sealing stability is poor. By connecting each liquid cooling plate 12 through a unified end plate 13, the number of connecting pipes and the number of liquid cooling connectors can be reduced, the installation is simple, the cost is low, the sealing difficulty is small, and the sealing stability is good.

[0057] Optionally, the plurality of liquid cooling plates 12, end plates 13 and the box body 11 are integrated.

[0058] Optionally, the first flow channel 121 comprises a first water inlet flow channel 1211 and a first water outlet flow channel 1212 arranged separately, the second flow channel 131 comprises a second water inlet flow channel 1311 and a second water outlet flow channel 1312 arranged separately, one end of the first water inlet flow channel 1211 is communicated with the second water inlet flow channel 1311, and the other end is communicated with the first water outlet flow channel 1212, and the first water outlet flow channel 1212 is communicated with the second water outlet flow channel 1312 at the end close to the end plate 13.

[0059] It can be understood that in order to realize the circulation flow, one end of the water inlet channel and the water outlet channel needs to be isolated, and the other end needs to be communicated, the water inlet channel is communicated with the water inlet 1125, and the water outlet channel is communicated with the water outlet 1126, so that the cooling liquid flows through the water inlet 1125, the water inlet channel, the water outlet channel and the water outlet 1126 in turn.

[0060] The second flow channel 131 of the end plate 13 comprises a second water inlet flow channel 1311 and a second water outlet flow channel 1312 arranged separately, the second water inlet flow channel 1311 is communicated with the water inlet 1125, and the second water outlet flow channel 1312 is communicated with the water outlet 1126, and the first flow channel 121 of the liquid cooling plate 12 comprises a first water inlet flow channel 1211 and a first water outlet flow channel 1212 arranged separately, one end of the first water inlet flow channel 1211 is communicated with the second water inlet flow channel 1311, and the other end is communicated with the first water outlet flow channel 1212, and the first water outlet flow channel 1212 is communicated with the second water outlet flow channel 1312 at the end close to the end plate 13, and the other end of the first water outlet flow channel 1212 away from the end plate 13 is communicated with the first water inlet flow channel 1211.

[0061] In this way, the flow direction of the cooling liquid is: the water inlet 1125→the second water inlet flow channel 1311→the first water inlet flow channel 1211→the first water outlet flow channel 1212→the water outlet 1126→the water inlet 1125, realizing the circulation flow of the cooling liquid.

[0062] Please continue to refer to Figure 5 Optionally, the side plate 112 (such as the rear beam 1123) can be provided with a mounting hole 1127, one end of the liquid cooling plate 12 can be mounted into the mounting hole 1127 without contacting the bottom wall of the mounting hole 1127, that is, there is a gap between the liquid cooling plate 12 and the side plate 112, which not only enables the side plate 112 to realize the mounting and fixation of the liquid cooling plate 12, but also enables the mounting hole 1127 to serve as a communication flow channel of the first water inlet flow channel 1211 and the first water outlet flow channel 1212, so that the first water inlet channel and the second water inlet channel are communicated, and an additional connecting piece is not needed to communicate the first water inlet channel and the second water inlet channel, thereby saving cost.

[0063] Optionally, the first flow channel 121 and the second flow channel 131 are vertically arranged, and the first water inlet flow channel 1211 and the first water outlet flow channel 1212 each include a plurality of first water inlet flow channels 1211 and a plurality of first water outlet flow channels 1212 are uniformly and spacedly distributed in the direction of the vertical bottom plate 111.

[0064] For example, the first flow channel 121 extends in the front-rear direction, and the second flow channel 131 extends in the left-right direction. Each liquid cooling plate 12 is vertically placed so that the plurality of first water inlet flow channels 1211 and the plurality of first water outlet flow channels 1212 of each liquid cooling plate 12 are uniformly and spacedly distributed in the direction of the vertical bottom plate 111.

[0065] In this way, by arranging a plurality of first water inlet flow channels 1211 and a plurality of first water outlet flow channels 1212 and uniformly and spacedly distributing them, the distribution of the cooling liquid in the liquid cooling plate 12 is more uniform, thereby facilitating the improvement of the heat dissipation effect of the liquid cooling plate 12.

[0066] Optionally, in the direction away from the bottom plate 111, the second water inlet flow channel 1311 and the second water outlet flow channel 1312 are sequentially arranged, the second water inlet flow channel 1311 is communicated with the water inlet 1125 of the box body 11, and the second water outlet flow channel is communicated with the water outlet 1126 of the box body 11.

[0067] That is to say, the cooling liquid can flow in from the lower part of the liquid cooling plate 12 and flow out from the upper part, that is, the water is supplied through the lower flow channel and the water is returned through the upper flow channel, and the cooling effect on the battery cells of all the battery monomers 21 is basically uniform, thereby reducing the temperature difference of the battery pack 100 and facilitating the improvement of the cycle life of the battery. And the flow channel does not need to be adjusted complicatedly (such as only the plurality of first water inlet flow channels 1211 and the plurality of first water outlet flow channels 1212 need to be uniformly and spacedly arranged), which can meet the cooling uniformity, thereby reducing the development cost and shortening the development cycle.

[0068] Please refer to Figure 6 In some embodiments, the end plate 13 is provided with a first cavity 1321, a second cavity 1322, and a partition plate 1323 separating the first cavity 1321 and the second cavity 1322, and the second flow channel 131 is arranged in the first cavity 1321.

[0069] The liquid cooling plate 12 and the box body 11 are integrally welded and formed, and for example, the edge beams of the liquid cooling plate 12 and the box body 11 are each an aluminum alloy profile. The heat from the outside is directly connected between the metals, is transmitted to the liquid cooling plate 12 through the edge beams of the box body 11, then heats the cooling liquid, and causes the liquid cooling effect to be poor, that is, heat leakage occurs, thereby causing poor heat management effect.

[0070] Therefore, by arranging the end plate 13 to communicate with one end of the liquid cooling plate 12, the flow channel of the liquid cooling plate 12 is realized, and the firm installation of each liquid cooling plate 12 is realized. The end plate 13 is arranged in opposite spaced relation to the side plate 112, and an air thermal insulation layer is formed between the end plate 13 and the side plate 112. Compared with the two ends of the liquid cooling plate 12 being connected to the two boundary beams respectively, the contact area is larger, and the contact area of the liquid cooling plate 12 and the side plate 112 can be reduced, thereby reducing the heat transferred to the liquid cooling plate 12 through the boundary beam from the outside, and ensuring the liquid cooling effect of the liquid cooling plate 12.

[0071] In this way, the end plate 13 forms the first cavity 1321 for circulating the cooling liquid and the second cavity 1322 as a thermal insulation layer, thereby further improving the thermal insulation effect.

[0072] Optionally, a plurality of spaced thermal insulation bridges 133 are arranged in the first cavity 1321. The thermal insulation bridges 133 are arranged on the partition plate 1323 and located in the first cavity 1321. The thermal insulation bridges 133 extend in the direction parallel to the bottom plate 111 (specifically, the left-right direction). A plurality of thermal insulation bridges 133 are arranged in the direction perpendicular to the bottom plate 111. The thermal conductivity of the thermal insulation bridges 133 is lower than that of the box body 11.

[0073] The material of the thermal insulation bridges 133 can be a plastic material with low thermal conductivity, which can improve the overall strength while ensuring thermal insulation.

[0074] For example, the thermal insulation bridges 133 can be broken bridge aluminum profiles. The principle is to add a thermal insulation strip in the middle of the aluminum alloy profile, disconnect the aluminum alloy in the middle, and form a broken bridge. In this way, the conduction of heat can be prevented, because the conduction of heat in a solid is mainly achieved through the molecular movement of materials such as metals, and the thermal insulation strip breaks this continuous metal conduction path.

[0075] It can be understood that, due to the expansion force of the battery cell, the through cavity (i.e., the second cavity 1322) will cause the end plate 13 to be weak in strength, resulting in deformation of the end plate 13. At the same time, since the end plate 13 is provided with the busbar (i.e., the first cavity 1321), the weak strength will cause the busbar to deform, and the flow resistance will increase.

[0076] Therefore, a plurality of spaced thermal insulation bridges 133 are arranged in the first cavity 1321, and the thermal insulation bridges 133 extend in the left-right direction, so that when the end plate 13 is stressed, the thermal insulation bridges 133 can provide strong support to increase the structural strength of the end plate 13.

[0077] Optionally, the thickness (such as T1 shown in the figure) of the thermal insulation bridge 133 is located in the thickness interval [1.5mm, 6mm], and the spacing (such as T2 shown in the figure) between adjacent two thermal insulation bridges 133 is located in the spacing interval [1mm, 5mm]. Figure 6 Figure 6 ​The thickness of the heat insulation bridge 133 is determined based on the T2 shown.

[0078] In this way, by reasonably setting the thickness of the heat insulation bridge 133 and the spacing between the heat insulation bridges 133, the structural strength of the end plate 13 can be ensured by using fewer heat insulation bridges 133 in the case of heat insulation, thereby reducing costs.

[0079] Please refer to Figure 2 and Figure 3 In some embodiments, the box assembly 10 further comprises a reinforcing member 14, which is located on both sides of the end plate 13 respectively, and one end of the reinforcing member 14 is connected to the end plate 13 and the other end is connected to the side plate 112.

[0080] The end plate 13 is arranged on the bottom plate 111 and connected to the side plate 112 at both ends. Although it has high structural strength, the end plate 13 will be subjected to a front-back direction force after the battery cell expands, and if the end plate 13 is partially broken, it will cause the cooling liquid to leak, affecting the liquid cooling effect.

[0081] Therefore, higher requirements are put forward for the structural strength of the end plate 13. By arranging the reinforcing member 14 between the end plate 13 and the opposite side plate 112 (such as the front beam 1121), a strong support can be provided when the end plate 13 is subjected to a front-back direction force, thereby further improving the structural strength of the end plate 13 and ensuring stable liquid cooling effect.

[0082] Please refer to Figure 7 The application provides an energy storage device 1000, which comprises a cabinet 200 and a plurality of battery packs 100. The battery packs 100 are installed in the cabinet 200.

[0083] The cabinet 200 is provided with a plurality of battery compartments 201, and the battery packs 100 are arranged in the battery compartments 201.

[0084] Optionally, the cabinet 200 comprises a support 210 and a guide rail 220. The support 210 and the guide rail 220 are cross-connected to form a plurality of battery compartments 201.

[0085] For example, the support 210 is a vertical reinforcing rib, and the guide rail 220 is horizontally arranged. The guide rail 220 and the reinforcing rib are cross-connected to form a plurality of battery compartments 201. For example, the guide rail 220 is used to carry the battery pack 100, and a plurality of rows of guide rails 220 are arranged in sequence along the front-back direction of the battery pack 100, and a battery compartment 201 is formed between any two rows of guide rails 220. The extension direction of the guide rail 220 is the installation direction of the battery pack 100, and the battery pack 100 is pushed into the battery compartment 201 along the guide rail 220 to install the battery pack 100 in the battery compartment 201.

[0086] Among them, the battery cabin 201 at least includes two oppositely arranged guide rails 220 (such as a first guide rail and a second guide rail), and the two sides of the battery pack 100 are respectively carried on the rail surfaces of the two guide rails 220. In this way, through the two oppositely arranged guide rails 220, the stable carrying of the battery pack 100 is realized, the cost is reduced, and the middle area of the battery pack 100 is unobstructed, thereby facilitating the improvement of the heat dissipation performance of the battery pack 100.

[0087] In the description of the present specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean 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.

[0088] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one feature. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, unless otherwise specifically limited.

[0089] Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized by, The battery pack comprises: a battery module comprising a plurality of battery cells; a box assembly for accommodating the battery module, the box assembly comprising a box, a liquid cooling plate and an end plate, the box comprising a bottom plate and side plates arranged around the bottom plate, the side plates and the bottom plate enclosing a receiving cavity, the battery module being located in the receiving cavity; the end plate is arranged on the bottom plate, one end of the liquid cooling plate is connected to the side plate, and the other end is connected to the end plate, the end plate is provided with isolated first and second cavities, the second cavity is in communication with the liquid cooling plate, and the first cavity is provided with a heat insulation bridge, the thermal conductivity of the heat insulation bridge being lower than that of the box.

2. The battery pack of claim 1, wherein, The liquid cooling plate comprises a plurality of liquid cooling plates, and the plurality of liquid cooling plates are arranged at intervals on the bottom plate to divide the receiving cavity into a plurality of sub-receiving cavities, and the sub-receiving cavities are used to accommodate one or more battery cells.

3. The battery pack of claim 1, wherein, The liquid cooling plate is provided with a first flow channel, and the second cavity of the end plate is provided with a second flow channel, and the second flow channel is in communication with each first flow channel.

4. The battery pack of claim 3, wherein, The first flow channel comprises a first water inlet flow channel and a first water outlet flow channel arranged at intervals, the second flow channel comprises a second water inlet flow channel and a second water outlet flow channel arranged at intervals, one end of the first water inlet flow channel is in communication with the second water inlet flow channel, and the other end is in communication with the first water outlet flow channel, and one end of the first water outlet flow channel close to the end plate is in communication with the second water outlet flow channel.

5. The battery pack of claim 4, wherein, The first flow channel and the second flow channel are arranged vertically, and the first water inlet flow channel and the first water outlet flow channel each comprise a plurality of first water inlet flow channels and a plurality of first water outlet flow channels, and the plurality of first water inlet flow channels and the plurality of first water outlet flow channels are uniformly and evenly distributed in the direction perpendicular to the bottom plate.

6. The battery pack of claim 4, wherein, In the direction away from the bottom plate, the second water inlet flow channel and the second water outlet flow channel are arranged in sequence, and the first water inlet flow channel and the first water outlet flow channel are arranged in sequence, the second water inlet flow channel is in communication with the water inlet of the box, and the second water outlet flow channel is in communication with the water outlet of the box.

7. The battery pack of claim 1, wherein, The end plate further comprises a partition plate for isolating the first cavity and the second cavity, the heat insulation bridge is arranged on the partition plate and located in the first cavity, the extension direction of the heat insulation bridge is parallel to the bottom plate, and the heat insulation bridge comprises a plurality of heat insulation bridges arranged at intervals in the direction perpendicular to the bottom plate.

8. The battery pack of claim 1, wherein, The thickness of the heat insulation bridge is in the thickness interval [1.5mm, 6mm].

9. The battery pack of claim 1, wherein, The box assembly further comprises a reinforcing member, and the reinforcing member and the liquid cooling plate are located on both sides of the end plate, one end of the reinforcing member is connected to the end plate, and the other end is connected to the side plate.

10. The battery pack of claim 1, wherein, The side plate comprises a front edge beam and a rear edge beam arranged oppositely, and a left edge beam and a right edge beam arranged oppositely, two ends of the front edge beam are connected to one end of the left edge beam and the right edge beam respectively, two ends of the rear edge beam are connected to the other end of the left edge beam and the right edge beam away from the front edge beam respectively, and the liquid cooling plate is arranged in the front-rear direction.

11. An energy storage device, characterized by, Comprise: a cabinet body comprising a plurality of battery compartments; a plurality of battery packs according to any one of claims 1-10, the battery packs being arranged in the battery compartments.

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