Energy storage equipment

Abstract

The utility model belongs to the field of batteries, relates to energy storage equipment, solves the problem that the batteries in the existing energy storage equipment have potential safety hazards, and comprises a battery cluster and a temperature control system, the battery cluster comprises at least one high-capacity battery assembly; the high-capacity battery assembly comprises a high-capacity battery and a heat exchange device; the high-capacity battery comprises a shell and a plurality of single batteries arranged in an inner cavity of the shell along the x direction; the shell is provided with at least one shared cavity communicated with inner cavities of all the single batteries; an avoiding hole is formed in the top plate of the shell; the polar terminal of each single battery extends out of the corresponding avoiding hole; the heat exchange device is arranged at the top of the shell, the polarity terminal penetrates through the heat exchange device, part of the structure is located in an inner cavity of the heat exchange device, and the electric connection part is located outside the heat exchange device. The temperature control system comprises a heat conveying unit and a heat processing unit; the heat conveying unit is used for conveying a heat transfer medium between each heat exchange device and the heat treatment unit; and the heat treatment unit is used for heating or cooling the heat transfer medium conveyed by the heat conveying unit.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of battery, concretely relates to a kind of energy storage equipment. BACKGROUND

[0002] With the development of solar energy, wind energy and other new energy, energy storage technology also develops, since lithium battery has the advantages of high energy, long service life, high rated voltage, high power bearing, low self-discharge rate, gradually becomes the mainstream product of energy storage.

[0003] With the application of lithium battery energy storage equipment, the safe use of lithium ion battery also attracts attention. Since the single batteries in the energy storage equipment are highly concentrated, a large amount of heat will be generated during charging and discharging, and the heat will gradually accumulate, causing uneven battery temperature, and in severe cases, the thermal balance of the battery is destroyed, which may cause thermal runaway of the battery and pose a certain safety hazard. SUMMARY

[0004] The utility model aims at providing a kind of energy storage equipment, solve the problem of safety hazard of battery in existing energy storage equipment.

[0005] The technical scheme of the utility model provides a kind of energy storage equipment, including temperature control system and at least one battery cluster;

[0006] Each battery cluster includes at least one battery pack, and each battery pack includes at least one large-capacity battery assembly;Each large-capacity battery assembly includes a large-capacity battery and a heat exchange device;

[0007] The large-capacity battery includes a shell and a plurality of single batteries;The plurality of single batteries are arranged in the inner cavity of the shell along the x direction, and the shell is provided with at least one shared chamber, and the inner cavity of the shared chamber and the inner cavities of all single batteries are communicated;The shell top plate is provided with a relief hole corresponding to the polarity terminal of each single battery;The polarity terminal of each single battery extends out of the corresponding relief hole, and the region of the shell top plate corresponding to the relief hole is fixed and sealed with the single battery shell body;

[0008] The heat exchange device is arranged at the top of the shell, and the inner cavity of the heat exchange device serves as a flow cavity for the insulating heat transfer medium;In the z direction, the polarity terminal penetrates the heat exchange device, and part of the structure of the polarity terminal is located in the inner cavity of the heat exchange device and directly contacts the insulating heat transfer medium;The other part of the structure of the polarity terminal is located outside the heat exchange device as an electrical connection part, and the side wall of the polarity terminal is sealed with the heat exchange device;

[0009] The temperature control system includes a heat transport unit and a heat treatment unit;The heat transport unit is used to transport the heat transfer medium between each heat exchange device and the heat treatment unit;The heat treatment unit is used to heat or cool the heat transfer medium transported by the heat transport unit.

[0010] The utility model discloses energy storage equipment includes multiple large capacity battery assembly, and each large capacity battery assembly includes large capacity battery and heat exchange device, and each large capacity battery is by multiple monomer battery and a shell with shared chamber constitutes, and multiple monomer battery is placed in the shell, utilizes shared chamber and the cavity of each monomer battery in the shell through, reduces the difference between each monomer battery, and the consistency between each monomer battery is promoted to a certain extent, thereby the cycle life of large capacity battery is promoted to a certain extent.

[0011] Meanwhile, the heat exchange device is directly arranged on the top of the large capacity battery, the inner cavity of the heat exchange device serves as a containing cavity for the heat exchange medium, and the polar terminal penetrates the heat exchange device in the z direction, that is, the part of the structure of the polar terminal is located in the heat exchange device and directly contacts the insulating heat exchange medium; the other part of the structure of the polar terminal is located outside the heat exchange device and serves as an electrical connection part. Compared with the scheme of indirect heat exchange (such as the scheme disclosed in Chinese patent CN118299714A), firstly, the heat exchange path is shortened from "heat exchange medium-heat exchange part-polar terminal" to "heat exchange medium-polar terminal", and the heat exchange medium directly acts on the polar terminal, so that the utilization efficiency of the heat exchange medium is improved, and the heat exchange efficiency of the large capacity battery is improved; secondly, the heat exchange area is increased from "the surface area of the clamping groove" to "the part of the structure of the polar terminal located in the heat exchange device", so that the heat exchange efficiency of the large capacity battery is further improved.

[0012] In addition, the energy storage equipment also has a temperature control system, which is directly connected with the heat exchange device of the large capacity battery and controls the temperature of the large capacity battery during operation, so as to avoid safety hazards of the large capacity battery and improve the use safety of the energy storage equipment.

[0013] Further, the heat exchange device includes a heat exchange pipe; the heat exchange pipe includes a pipe body, the pipe body is provided with a first channel and at least one row of second channel units; the first channel extends along the x direction and serves as an insulating heat transfer medium flow cavity; each row of second channel units includes a plurality of second channels arranged along the x direction, and each second channel extends along the z direction and penetrates the first channel;

[0014] Each second channel in each row of second channel units corresponds to the polar terminal located on the same side of the large capacity battery;

[0015] Each polar terminal is inserted into the corresponding second channel, and in the z direction, the electrical connection part of the polar terminal extends out of the second channel;

[0016] The first port and the second port of the second channel are sealed between the side walls of the corresponding polar terminal.

[0017] Further, the functional structure is arranged on the polar terminal, and the functional structure is used to increase the heat exchange area of the polar terminal; the part of the polar terminal, where the functional structure is arranged, is located in the first channel. Compared with the polar terminal without the functional structure, the polar terminal has a larger heat exchange area, and thus a better heat exchange effect can be obtained.

[0018] Further, the functional structure is n first annular grooves, and n is an integer greater than or equal to 1; each first annular groove extends in the circumferential direction of the side wall of the polar terminal, and the n first annular grooves are arranged in the height direction of the polar terminal. Compared with other functional structures, the annular groove is relatively easy to process, and thus the polar terminal has a lower cost.

[0019] Further, a first insulating sealant layer is arranged between each monomer battery polar terminal and the corresponding avoiding hole; the area of the top plate of the shell corresponding to the avoiding hole is fixed and sealed with the monomer battery shell, and compared with the sealing mode using the sealing connector, the structure and the sealing process are relatively simple.

[0020] Further, the large-capacity battery assembly further comprises a second insulating sealant layer; the second insulating sealant layer is laid on the top of the large-capacity battery, and cooperates with the first sealant layer to wrap the heat exchange device (the liquid inlet end and the liquid outlet end of the heat exchange device need to be located outside the second insulating sealant layer). The first insulating sealant layer and the second insulating sealant layer can be used as a whole, which can realize the sealing of the avoiding hole part and further improve the sealing performance of each part of the heat exchange device; in addition, during long-term use, due to the temperature difference between the inside and outside of the heat exchange device, condensation may be generated on the surface, and when the condensation accumulates to a certain amount, short circuit may occur; by laying the insulating sealant layer on the top of the large-capacity battery, when the condensation is generated on the surface of the heat exchange device, the insulating sealant layer can prevent the short circuit of the battery; at the same time, the insulating sealant layer wraps the outside of the heat exchange device, and when the heat exchange pipe made of non-insulating material is used, the insulation between the heat exchange device and the top of the large-capacity battery can be further improved.

[0021] Further, in each battery cluster, a plurality of battery packs are arranged in the z direction, and in each battery pack, a plurality of large-capacity battery assemblies are arranged in the y direction.

[0022] The heat transfer unit comprises a liquid supply pipeline assembly, a liquid outlet pipeline assembly, a liquid inlet pipeline assembly and a liquid return pipeline assembly; the liquid supply pipeline assembly is used to deliver the heat transfer medium in the heat treatment unit to each battery cluster, and the liquid outlet pipeline assembly is used to converge the heat transfer medium after heat exchange with each battery cluster to the heat treatment unit.

[0023] The liquid inlet pipeline assembly and the liquid outlet pipeline assembly correspond to the battery cluster; in each battery cluster, the liquid inlet pipeline assembly is used to distribute the heat transfer medium in the liquid supply pipeline assembly to the heat exchange devices of the plurality of large-capacity battery assemblies; and the liquid return pipeline assembly is used to collect the heat transfer medium after heat exchange in the heat exchange devices of the plurality of large-capacity battery assemblies to the liquid outlet pipeline assembly.

[0024] Further, each liquid inlet pipeline assembly comprises a primary liquid inlet pipeline, a plurality of secondary liquid inlet pipelines and a plurality of tertiary liquid inlet pipelines;

[0025] The liquid inlet port of the primary liquid inlet pipeline is used to connect with the liquid supply pipeline assembly;

[0026] The secondary liquid inlet pipeline corresponds to the battery pack in the battery cluster corresponding to the liquid inlet pipeline assembly; each secondary liquid inlet pipeline is connected with the primary liquid inlet pipeline to distribute the heat transfer medium in the primary liquid inlet pipeline to the corresponding battery pack;

[0027] The tertiary liquid inlet pipeline corresponds to the large-capacity battery assembly in the battery cluster corresponding to the liquid inlet pipeline assembly; for each battery pack, two ends of each tertiary liquid inlet pipeline are connected with the secondary liquid inlet pipeline and the heat exchange device of the corresponding large-capacity battery assembly, respectively, and each tertiary liquid inlet pipeline distributes the heat transfer medium in the secondary liquid inlet pipeline to the heat exchange device of the corresponding large-capacity battery assembly in the battery pack;

[0028] The liquid return pipeline assembly comprises a primary liquid outlet pipeline, a plurality of secondary liquid outlet pipelines and a plurality of tertiary liquid outlet pipelines;

[0029] The liquid outlet port of the primary liquid outlet pipeline is used to connect with the liquid outlet pipeline assembly;

[0030] The secondary liquid outlet pipeline corresponds to the battery pack in the battery cluster; each secondary liquid outlet pipeline is connected with the primary liquid outlet pipeline to collect the heat transfer medium after heat exchange in the battery pack to the primary liquid outlet pipeline;

[0031] The tertiary liquid outlet pipeline corresponds to the large-capacity battery assembly in the battery cluster; for each battery pack, two ends of each tertiary liquid outlet pipeline are connected with the secondary liquid outlet pipeline corresponding to the battery pack and the heat exchange device of the corresponding large-capacity battery assembly, respectively, and are used to collect the heat transfer medium after heat exchange with the large-capacity battery to the secondary liquid outlet pipeline.

[0032] The liquid inlet pipeline assembly and the liquid return pipeline assembly are made of multi-stage pipelines, so that the heat transfer medium flowing out of the liquid supply pipeline assembly is distributed step by step and evenly to each battery module, the flow of the heat transfer medium distributed to each battery module is balanced, so that each battery module in the battery cluster has good and balanced heat dissipation effect, thereby improving the working stability and service life of each battery module.

[0033] Further, the battery cluster is a plurality of matrix-arranged clusters;

[0034] The liquid supply pipeline assembly comprises a first shunt pipe, a second shunt pipe and a third shunt pipe; the inlet of the first shunt pipe is used for being connected with the heat treatment unit; the second shunt pipe is used for shunting the heat transfer medium in the first shunt pipe to different columns or different rows of battery clusters; and the third shunt pipe is used for shunting the heat transfer medium in the second shunt pipe to a plurality of battery clusters in the same column or the same row.

[0035] The liquid outlet pipeline assembly comprises a first confluence pipe, a second confluence pipe and a third confluence pipe; the third confluence pipe is used for converging the heat transfer medium of a plurality of battery clusters in the same column or the same row to the second confluence pipe; the second confluence pipe is used for converging the heat transfer medium of different columns or different rows of battery clusters to the first confluence pipe; and the outlet of the first confluence pipe is used for being connected with the heat treatment unit.

[0036] The liquid supply pipeline assembly and the liquid outlet pipeline assembly are manufactured through multiple levels of pipelines, so that the heat transfer medium flowing out of the heat treatment unit is shunted and evenly distributed to each battery cluster in stages, and the flow of the heat transfer medium distributed to each battery cluster is balanced, so that each battery cluster and each battery module in the battery cluster have good and balanced heat dissipation effects, thereby improving the working stability and service life of the energy storage equipment.

[0037] Further, at least part of the pipelines of the liquid supply pipeline assembly, the liquid outlet pipeline assembly, the liquid inlet pipeline assembly and the liquid return pipeline assembly are provided with a heat preservation layer; the heat preservation layer can effectively prevent the loss of cold or heat of the heat transfer medium, reduce energy consumption, and avoid condensation on the walls of the pipelines. The second liquid inlet pipe and the second liquid outlet pipe are formed by splicing multiple sections of pipelines; this kind of spliced pipeline reduces the error and assembly difficulty when the second liquid inlet pipe and the second liquid outlet pipe are connected. At the same time, when subsequent maintenance is required, only the pipeline connectors of the relevant battery modules need to be removed for maintenance, without the need to remove the entire temperature control pipeline assembly, so that installation and maintenance are very convenient. The liquid supply pipeline assembly is provided with a water supplement connector for supplementing the heat transfer medium of the temperature control system, and the liquid outlet pipeline assembly is provided with an exhaust valve. The exhaust valve is used for exhausting air in the temperature control system, and the water supplement connector and the exhaust valve work together to enable the temperature control system to efficiently control the temperature of each battery module, thereby improving the temperature control effect of the temperature control system.

[0038] The utility model discloses the beneficial effect is:

[0039] The utility model discloses energy storage equipment includes a plurality of large capacity battery assemblies, and each large capacity battery assembly includes a large capacity battery and a heat exchange device, and each large capacity battery is constituted by a plurality of single batteries and a shell with a shared chamber. The plurality of single batteries are placed in the shell, and the shared chamber and the inner cavities of the single batteries in the shell are connected, thereby reducing the differences between the single batteries and improving the consistency between the single batteries to some extent, thereby improving the cycle life of the large capacity battery to some extent.

[0040] At the same time, the heat exchange device is directly arranged on the top of the large-capacity battery, the inner cavity of the heat exchange device serves as a containing cavity of the heat exchange medium, and the polar terminal penetrates the heat exchange device in the z direction, that is, the part of the structure of the polar terminal is located in the heat exchange device and directly contacts the insulating heat exchange medium, and the other part of the structure of the polar terminal is located outside the heat exchange device and serves as an electrical connection part. Compared with the scheme of indirect heat exchange (such as the scheme disclosed in Chinese Patent CN118299714A), first, the heat exchange path is shortened from “heat exchange medium-heat exchange part-polar terminal” to “heat exchange medium-polar terminal”, the heat exchange medium directly acts on the polar terminal, the utilization efficiency of the heat exchange medium can be improved, and then the heat exchange efficiency of the large-capacity battery can be improved; second, the heat exchange area is increased from “a certain surface area of a clamping groove” to “the part of the structure of the polar terminal located in the heat exchange device”, and the heat exchange efficiency of the large-capacity battery can be further improved.

[0041] In addition, the energy storage device also has a temperature control system, which is directly connected with the heat exchange device of the large-capacity battery, controls the temperature of the large-capacity battery during operation, avoids safety hazards of the large-capacity battery, and improves the use safety of the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 FIG. 1 is a structural schematic diagram of an energy storage device;

[0043] Figure 2 FIG. 2 is a structural schematic diagram of a battery pack;

[0044] Figure 3 FIG. 3 is a structural schematic diagram of a large-capacity battery assembly provided with a first heat exchange pipe;

[0045] Figure 4 FIG. 4 is a sectional view of the large-capacity battery assembly provided with the first heat exchange pipe;

[0046] Figure 5 FIG. 5 is a structural schematic diagram of a single battery;

[0047] Figure 6 FIG. 6 is a structural schematic diagram of a first heat exchange pipe;

[0048] Figure 7 FIG. 7 is a sectional view of the first heat exchange pipe;

[0049] Figure 8 FIG. 8 is a partial sectional view of a large-capacity battery assembly;

[0050] Figure 9 FIG. 9 is a partial sectional view of another large-capacity battery assembly;

[0051] Figure 10 FIG. 10 is a structural schematic diagram of a large-capacity battery assembly provided with a second heat exchange pipe;

[0052] Figure 11 is a sectional view of a large capacity battery assembly provided with a second heat exchange pipe member;

[0053] Figure 12 is a structural diagram of a second heat exchange pipe member;

[0054] Figure 13 is a structural diagram of a large capacity battery assembly provided with a second insulating sealant layer;

[0055] Figure 14 is a sectional view of a large capacity battery assembly provided with a second insulating sealant layer;

[0056] Figure 15 is an exploded diagram of an outer shell;

[0057] Figure 16 is a structural diagram of a cylinder body;

[0058] Figure 17 is a structural diagram of a temperature control system connected with a heat exchange device;

[0059] Figure 18 is a partial structural diagram of a temperature control system;

[0060] Figure 19 is a structural diagram of a liquid inlet pipe assembly and a liquid return pipe assembly corresponding to a battery cluster;

[0061] Figure 20 is a partial structural diagram of an energy storage device;

[0062] Figure 21 is a structural diagram of a heat treatment unit Figure 1 ;

[0063] Figure 22 is an exploded structural diagram of a blocking joint;

[0064] Figure 23 is a structural diagram of a heat treatment unit Figure 2 ;

[0065] Figure 24 is a flow diagram of a heat transfer medium Figure 1 ;

[0066] Figure 25 is a flow diagram of a heat transfer medium Figure 2 ;

[0067] Reference numerals in the drawings are:

[0068] 1, battery pack; 11, large-capacity battery assembly; 12, large-capacity battery; 120, avoiding hole; 121, shell; 122, single battery; 1221, upper cover plate; 1222, unpacking piece; 1223, lower cover plate; 1224, insulating member; 1225, polarity terminal; 1226, electrical connection part; 123, electrolyte sharing chamber; 124, gas sharing chamber; 125, shell top plate; 126, shell bottom plate; 127, support; 128, sealing ring; 129, first insulating sealant layer; 13, heat exchange device; 131, heat exchange pipe; 60, first heat exchange pipe; 61, second heat exchange pipe; 611, first channel; 610, second channel; 612, first port; 613, second port; 62, first annular sealing gasket; 63, second annular sealing gasket; 7, connecting pipe; 14, first annular groove; 15, second insulating sealant layer; 17, cylinder; 171, cylinder side plate; 172, cylinder top plate; 18, end plate; 19, insulating protective cover;

[0069] 2, temperature control system; 22, heat delivery unit; 23, heat treatment unit; 231, liquid inlet pipeline assembly; 2311, first-stage liquid inlet pipe; 2312, second-stage liquid inlet pipe; 2313, third-stage liquid inlet pipe; 232, liquid return pipeline assembly; 2321, first-stage liquid outlet pipe; 2322, second-stage liquid outlet pipe; 2323, third-stage liquid outlet pipe; 236, quick connector; 235, hose; 233, liquid supply pipeline assembly; 2331, first-stage shunt pipe; 2332, second-stage shunt pipe; 2333, third-stage shunt pipe; 234, liquid outlet pipeline assembly; 2341, first-stage confluence pipe; 2342, second-stage confluence pipe; 2343, third-stage confluence pipe; 241, temperature control machine; 2411, liquid inlet; 2412, liquid outlet; 44, blocking connector; 441, connector end pipe; 442, regulating valve; 443, welding chuck; 242, radiator; 243, control valve. DETAILED DESCRIPTION

[0070] In order to make the above-mentioned purpose, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0071] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the content of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0072] In the description of the utility model, it needs to explain that the position or position relation of the terms such as "top, bottom" is based on the position or position relation shown in the drawing, just for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the indicated device or element must have a particular orientation, structure and operation, therefore it can not be understood as the limitation of the utility model.In addition, the terms "first, second, third, fourth, etc." are only for the purpose of description, and can not be understood as indicating or implying relative importance.

[0073] As Figure 1 And Figure 2 The utility model discloses a kind of energy storage equipment, including temperature control system 2 and at least one battery cluster.

[0074] Battery cluster includes at least one battery pack 1, and each battery pack 1 includes at least one large-capacity battery assembly 11.

[0075] As Figure 3 And Figure 4 Each large-capacity battery assembly 11 includes large-capacity battery 12 and heat exchange device 13 as shown in the figure;

[0076] Large-capacity battery 12 includes shell 121 and multiple single batteries 122;Multiple single batteries 122 are placed in the cavity of shell 121 along the same direction.

[0077] Generally adopt rectangular shell 121, for the convenience of description, the length direction of shell 121 is defined as x direction, the width direction of shell 121 is defined as y direction, and the height direction of shell 121 is defined as z direction.

[0078] The utility model does not make specific limitation to shell 121 structure, and at least the following two structures can be used:

[0079] The first structure includes cylinder (i.e. the port parallel to yz plane is open end) with two open ends and end plate (i.e. end plate is parallel to yz plane) fixed at two open ends of cylinder respectively;

[0080] The second structure includes cylinder (i.e. the port parallel to xy plane is open end) with top and bottom open ends and top plate and bottom plate (i.e. top plate and bottom plate are parallel to xy plane, wherein bottom plate can be integrated with cylinder) fixed at top and bottom open ends of cylinder respectively;

[0081] Shared chamber is arranged in the above-mentioned shell 121.

[0082] It needs to be explained that:

[0083] The shared chamber can be an electrolyte shared chamber 123, the inner cavity of the electrolyte shared chamber 123 and the inner cavities of the single batteries 122 are communicated, and the single batteries 122 can be in a unified electrolyte environment through the electrolyte shared chamber 123, so as to ensure the uniformity of the electrolyte in the single batteries 122 and improve the performance and charge-discharge cycle life of the large-capacity battery 12. The electrolyte shared chamber 123 described herein is a liquid channel extending along the length direction of the shell 121 between the shell bottom plate 126 and the single batteries 122. The liquid channel can be integrally formed with the shell bottom plate 126, or can be formed by arranging a support 127 between the single battery 122 lower cover plate 1223 and the shell bottom plate 126. It should be noted that in the shell 121 of the first structure, the shell bottom plate 126 herein is a cylinder bottom plate; in the shell 121 of the second structure, the shell bottom plate 126 herein is a bottom plate.

[0084] The shared chamber can also be a gas shared chamber 124 arranged on the shell top plate 125, and the gas shared chamber 124 covers the gas ports on the top of the single batteries 122 in the large-capacity battery 12.

[0085] It should be noted that in the shell 121 of the first structure, the shell top plate 125 herein is a cylinder top plate; in the shell 121 of the second structure, the shell top plate 125 herein is a top plate.

[0086] It should also be noted that the gas port includes the following two meanings:

[0087] 1) The gas port is a first through hole directly formed on the upper cover plate 1221 of the single battery 122 and penetrating the inner cavity of the single battery 122;

[0088] At this time, the inner cavity of the gas shared chamber 124 is communicated with the gas area of the inner cavities of the single batteries 122 through the gas port, and the gas shared chamber 124 can communicate the gas areas of the single batteries 122, achieve gas balance, make the single batteries 122 share gas to ensure the consistency of the single batteries 122, and improve the cycle life of the large-capacity battery 12 to a certain extent; when thermal runaway occurs in any single battery 122, the smoke in the inner cavity of the single battery 122 enters the gas shared chamber 124 and is discharged through the gas shared chamber 124, thereby improving the safety of the large-capacity battery 12.

[0089] 2) The gas port is a venting port or explosion-proof port arranged on the upper cover plate 1221 of the single battery 122, and the venting port or explosion-proof port is provided with a venting film;

[0090] At this time, the gas sharing chamber 124 is used as an explosion venting passage. When the explosion venting membrane at the gas port of any single battery 122 is broken by the internal cavity smoke, the internal cavity of the single battery 122 and the gas sharing chamber 124 are communicated, and the smoke in the internal cavity is discharged through the gas sharing chamber 124, thereby improving the safety of the large capacity battery 12.

[0091] The above-mentioned sharing chamber can also be a gas-liquid sharing chamber. Through a gas-liquid sharing chamber, each single battery 122 can be in a unified electrolyte environment and gas environment, thereby improving the performance and charge-discharge cycle life of the large capacity battery 12.

[0092] In order to facilitate the electrical connection of such a large capacity battery 12, a relief hole 120 is formed in the shell top plate 125 (in the first structure of the shell 121, the shell top plate 125 here is a cylinder top plate; in the second structure of the shell 121, the shell top plate 125 here is a top plate) corresponding to the polarity terminal 1225 of each single battery 122; each single battery 122 polarity terminal 1225 extends out of the corresponding relief hole 120 as the polarity terminal of the large capacity battery 12, and the area of the shell top plate 125 corresponding to the relief hole 120 is fixedly sealed with the single battery 122 shell, so that the relief hole 120 part of the shell top plate 125 is sealed.

[0093] It should be noted that the single battery 122 polarity terminal 1225 described here can be a single battery 122 pole, and if the single battery 122 pole cannot be smoothly extended out of the relief hole 120 or the height of the single battery 122 pole extended out of the relief hole 120 does not meet the set requirements when the single battery 122 pole is used as the polarity terminal 1225, a pole adapter can also be connected to the single battery 122 pole, and the entire structure of the single battery 122 pole and the pole adapter is used as the single battery 122 polarity terminal 1225.

[0094] The heat exchange device 13 is used for heat exchange of the large capacity battery 12. Here, heat exchange can be understood as heat dissipation of the large capacity battery 12 or heating of the large capacity battery 12; when the temperature of the large capacity battery 12 is higher than a set threshold, the large capacity battery 12 is cooled by passing a heat transfer medium with a lower temperature into the heat exchange device 13; when the temperature of the large capacity battery 12 is lower than a set threshold, the large capacity battery 12 is heated by passing a heat transfer medium with a higher temperature into the heat exchange device 13; by controlling the temperature of the heat transfer medium, the large capacity battery 12 can always operate at a normal working temperature.

[0095] In order to improve the heat exchange efficiency of the large capacity battery 12, the utility model mainly carries out heat exchange to the polarity terminal 1225 of the single battery 122 which is relatively concentrated in heat, simultaneously, through optimizing the heat exchange structure, adopts direct heat exchange mode, makes the polarity terminal 1225 and heat transfer medium direct contact, realizes the heat exchange of the polarity terminal 1225, therefore, the heat exchange device 13 is arranged at the top of the large capacity battery 12 shell 121, and the inner chamber of the heat exchange device 13 is used as the insulation heat transfer medium flow chamber, in the z direction, the polarity terminal 1225 penetrates the heat exchange device 13, and the part of the structure of the polarity terminal 1225 is directly contacted with the insulation heat transfer medium, another part of the structure of the polarity terminal 1225 is located outside the heat exchange device 13 and is used as the electric connection part 1226, and the side wall of the polarity terminal 1225 is sealed with the heat exchange device 13, compared with the effect that the heat transfer medium indirectly exchanges heat with the polarity terminal 1225 through the heat exchange piece, firstly, the heat exchange path is short, and the utilization efficiency of the heat transfer medium can be improved, secondly, the heat exchange area is large, the heat exchange efficiency is improved, and then the heat exchange efficiency of the large capacity battery 12 can be further improved.

[0096] The temperature control system 2 comprises a heat delivery unit 22 and a heat treatment unit 23.

[0097] The heat delivery unit 22 is used for delivering the heat transfer medium between the heat exchange device 13 and the heat treatment unit 23, and the heat treatment unit 23 is used for heating or cooling the heat transfer medium delivered by the heat delivery unit 22.

[0098] The specific structure of the large capacity battery assembly 11, the temperature control system 2 and the energy storage equipment will be described in detail in combination with the drawings and specific embodiments.

[0099] Embodiment 1

[0100] The embodiment is a large capacity battery assembly 11, and the specific structure can be referred to Figures 3 to 12 .

[0101] As shown in Figure 3 and Figure 4 , the large capacity battery assembly 11 comprises a large capacity battery 12 and a heat exchange device 13.

[0102] The large capacity battery 12 of the embodiment comprises a shell 121 and 12 single batteries 122 arranged in the inner chamber of the shell 121 along the x direction.

[0103] As shown in Figure 5As shown, the single battery 122 of the embodiment includes an outer shell, and an electrode assembly and an electrolyte located in the outer shell; wherein the outer shell is enclosed by an outer cylinder, a lower cover assembly, and an upper cover assembly. The lower cover assembly of the embodiment includes a lower cover plate 1223, and an opening piece 1222 can also be arranged on the lower cover plate 1223. The opening piece 1222 can be separated from the lower cover plate 1223 of the single battery 122 under the action of an external force or electrolyte, and a through hole passing through the inner cavity of the outer shell is formed in the lower cover plate 1223. Based on the through hole, the inner cavities of the single batteries 122 are in communication with the electrolyte sharing chamber 123; the opening piece 1222 is a structure known in the art, for example, the opening piece disclosed in Chinese Patent CN221327991 U, the sealing device disclosed in Chinese Patent CN117476997A, and the opening device disclosed in CN117477117A, etc. The upper cover assembly includes an upper cover plate 1221 and two polarity terminals 1225 located on the upper cover plate 1221; an insulating member 1224 can be sleeved on the two polarity terminals 1225 and insulated from the upper cover plate 1221 by the insulating member 1224; wherein the insulating member 1224 can be an annular insulating glue layer formed after insulating glue is poured between the polarity terminals 1225 and the upper cover plate 1221, or an insulating glue sleeve arranged between the polarity terminals 1225 and the upper cover plate 1221, etc. The material of the insulating member 1224 can adopt the insulating material between the polarity terminals 1225 and the upper cover plate 1221 in the prior art. In addition, the connection mode of the insulating member 1224 with the polarity terminals 1225 and the upper cover plate 1221 can also adopt the related prior art, which is not limited in the embodiment. The opening piece 1222 can also be arranged on the upper cover plate 1221, and the opening piece 1222 is located between the two polarity terminals 1225. The opening piece 1222 can be separated from the upper cover plate 1221 of the single battery 122 under the action of an external force or electrolyte, and a through hole passing through the inner cavity of the outer shell is formed in the upper cover plate 1221; based on the through hole, the inner cavities of the single batteries 122 are in communication with the gas sharing chamber 124; the opening piece 1222 adopts a structure known in the art, which can be the same as or different from the opening piece 1222 on the lower cover plate 1223.

[0104] In other embodiments, the structure and number of the single battery 122 can be adjusted according to actual needs.

[0105] As shown in the figure, Figure 4 The outer shell top plate 125 is provided with a relief hole 120 through which the polarity terminals 1225 of the single batteries 122 can extend. The polarity terminals 1225 of the single batteries 122 extend through the corresponding relief holes 120, and the area of the relief hole 120 on the outer shell top plate 125 is fixedly sealed with the outer shell of the single battery 122.

[0106] The following scheme can be used to achieve sealing:

[0107] Scheme one: each monomer battery 122 polarity terminal 1225 out of the corresponding hole 120, and the hole 120 and the polarity terminal 1225 between the additional sealing connector, realize the hole 120 corresponding to the fixed sealing of the shell top plate 125 area and the monomer battery 122 shell.

[0108] The sealing connector comprises a hollow member; the bottom of the hollow member is used for sealing connection with the first area of the monomer battery 122, and the top of the hollow member is sealingly connected with the second area of the shell top plate 125; wherein the first area is the area on the periphery of any polarity terminal 1225 on the monomer battery 122 cover plate 1221 of the monomer battery 122; wherein the area on the periphery of the polarity terminal 1225 is the area on the periphery of the insulating member 1224 on the polarity terminal 1225. The second area is the area on the shell top plate 125 corresponding to any one of the holes 120 on the shell top plate 125. The area on the shell top plate 125 corresponding to the hole 120 is the peripheral area on the outer surface of the shell top plate 125 corresponding to any one of the holes 120; or the area on the shell top plate 125 corresponding to the hole 120 is the hole wall of the hole 120.

[0109] Scheme two: glue is injected into the annular gap between the hole 120 and the polarity terminal 1225 to realize the fixed sealing of the shell top plate 125 area corresponding to the hole 120 and the monomer battery 122 shell.

[0110] Compared with scheme one, scheme two does not need to use welding process, and the process is simple and easy to operate. Therefore, scheme two is adopted in the embodiment, and at the same time, in order to improve the stability of the glue layer in the annular gap, at least part of the structure of the insulating member 1224 sleeved on each polarity terminal 1225 of the embodiment extends into the hole 120 on the shell top plate 125 of the large-capacity battery 12, which facilitates bonding with the first insulating sealing glue layer 129 located in the hole 120. Preferably, the upper end surface of the insulating member 1224 is not lower than the plane on which the upper surface of the shell top plate 125 is located.

[0111] From Figure 4 It can also be seen from the above that the insulating member 1224 sleeved on each polarity terminal 1225 of the monomer battery 122 of the embodiment extends into the corresponding hole 120, and the first insulating sealing glue layer 129 is formed by injecting the first insulating sealing glue into the annular gap between the insulating member 1224 and the hole 120, thereby realizing the fixed sealing of the shell top plate 125 area corresponding to the hole 120 and the monomer battery 122 shell. Figure 4 In the above, in order to display the hole 120, the first insulating sealing glue layer 129 is not shown in the annular gap on one side.

[0112] The wall of the avoiding hole 120 can be provided with an annular groove or boss along the circumference thereof, and the first insulating sealing glue layer 129 is arranged in the annular groove or boss to form a stop structure, so as to further improve the stability of the first insulating sealing glue layer 129.

[0113] When the inner surface of the top plate 125 of the shell and the upper cover plate 1221 of the single battery 122 are closely attached, the first insulating sealing glue may not flow into the inner cavity of the shell 121, but when there is a large gap between the inner surface of the top plate 125 of the shell and the upper cover plate 1221 of the single battery 122, in the process of injecting the first insulating sealing glue into the annular gap, under the action of gravity, the first insulating sealing glue inevitably flows from the annular gap, the gap between the inner surface of the top plate 125 of the shell and the upper cover plate 1221 of the single battery 122 into the inner cavity of the shell 121, and when the first insulating sealing glue contains substances that can react with the electrolyte, it may affect the performance of the battery.

[0114] In order to overcome this problem, the sealing ring 128 is sleeved around the polarity terminal 1225 of each single battery 122 in the embodiment, the bottom surface of the sealing ring 128 is closely attached to the upper cover plate 1221 of the single battery 122, and the top surface of the sealing ring 128 is closely attached to the inner surface of the top plate 125 of the shell. The sealing ring 128 not only has a glue blocking effect, but also has a sealing effect, and cooperates with the first insulating sealing glue layer 129 to achieve better sealing effect. In order to further improve the sealing performance, the inner annular surface of the sealing ring 128 is closely attached to the insulating member 1224.

[0115] An L-shaped sealing ring can also be used, that is, the cross section of the L-shaped sealing ring is L-shaped; the L-shaped sealing ring includes a horizontal sealing surface and a vertical sealing surface; the horizontal sealing surface is clamped between the upper cover plate 1221 of the single battery 122 and the top plate 125 of the shell, the vertical sealing surface is located in the annular gap, and the outer annular surface of the vertical sealing surface is closely attached to the hole wall of the avoiding hole 120. Based on the vertical sealing surface, the vertical sealing surface can be sealed from the axial direction of the avoiding hole 120, in addition, the vertical sealing surface is attached to the hole wall of the avoiding hole 120, which can position the L-shaped sealing ring, and prevent the sealing ring 128 from falling off or shifting during installation.

[0116] The sealing ring 128 can be made of plastic, has a certain degree of elasticity, and does not react with the electrolyte. The sealing ring 128 does not need to be connected to the upper cover plate 1221 of the corresponding single cell 122. It can simply be placed in the corresponding position and the sealing ring 128 can be pressed against the upper cover plate 1221 of the corresponding single cell 122 using the housing top plate 125. To prevent the sealing ring 128 from falling off or shifting during installation, the lower end of the sealing ring 128 can be bonded to the upper cover plate 1221 of the corresponding single cell 122. Alternatively, an annular groove for fixing the sealing ring 128 can be pre-formed on the upper cover plate 1221 of the single cell 122, and the sealing ring 128 can be fixed in the annular groove.

[0117] like Figure 4 As shown, in this embodiment, a support member 127 extending along the x-direction is provided between the bottom plate 126 of the shell and each single cell 122 to form a liquid channel serving as an electrolyte shared chamber 123; by opening the opening piece 1222 on the lower cover plate 1223 of the single cell, the electrolyte area in the inner cavity of each single cell 122 is connected to the electrolyte shared chamber 123.

[0118] Figure 4 In the embodiment, a boss extending in the x direction is provided on the top plate 125 of the shell, and a gas channel is provided on the boss. The gas channel is connected to the inner cavity of the shell 121 to serve as a gas sharing chamber 124. By opening the opening piece ( Figure 4 The opening piece is not shown in the figure) so that the gas area in the inner cavity of each single battery 122 is connected to the gas sharing chamber 124; when the inner cavity of the single battery 122 produces gas, the inner cavity of the gas sharing chamber 124 can also be used as a gas receiving chamber to alleviate the swelling problem of the shell 121 caused by gas production.

[0119] In some other embodiments, when the upper cover 1221 is not provided with an opening piece 1222, the gas sharing chamber 124 covers the gas port of each single battery 122. At this time, the gas sharing chamber 124 is used as an explosion relief channel. When the explosion relief membrane at the gas port of any single battery 122 is broken by the internal cavity smoke, the internal cavity of the single battery 122 and the gas sharing chamber 124 are connected, and the internal smoke is discharged through the gas sharing chamber 124, thereby improving the safety of the large-capacity battery 12.

[0120] In some other embodiments, only the electrolyte sharing chamber 123 or the gas sharing chamber 124 may be provided.

[0121] Combine Figures 6 to 12As can be seen, the heat exchange device 13 of the embodiment includes heat exchange pipe fittings 131 having first channels 611 and at least one row of second channel units; the first channels 611 extend along the x direction; each row of second channel units includes a plurality of second channels 610 arranged along the x direction, each second channel 610 extends along the z direction and penetrates the first channel 611; and each second channel 610 in each row of second channel units and the polarity terminal 1225 on the same side of the plurality of single batteries 122 correspond one-to-one.

[0122] In the embodiment, mainly with one row of second channel units and with two rows of second channel units, the heat exchange pipe fittings 131 with one row of second channel units can be defined as first heat exchange pipe fittings 60, and the heat exchange pipe fittings 131 with two rows of second channel units can be defined as second heat exchange pipe fittings 61.

[0123] The second channel 610 in the heat exchange pipe fittings 131 of the above two types of structures needs to have a projection area on the xy plane slightly larger than the projection area on the xy plane of the corresponding polarity terminal 1225 first part (wherein the polarity terminal 1225 first part includes the part of the polarity terminal 1225 located in the heat exchange device 13 and the electrical connection part 1226 located at the upper end of the part), to ensure that the corresponding polarity terminal 1225 first part can be inserted into the second channel 610, and in the z direction, the size of the second channel 610 is smaller than the size of the corresponding polarity terminal 1225 first part, to ensure that in the z direction, the top end of the polarity terminal 1225 first part as the electrical connection part 1226 extends out of the second channel 610.

[0124] In some cases, the cross-sectional area of the polarity terminal 1225 first part and the rest of the part is completely equal, so it can be considered that only "the projection area of the second channel 610 on the xy plane is slightly larger than the projection area of the corresponding polarity terminal 1225 on the xy plane, and in the z direction, the size of the second channel 610 is smaller than the size of the corresponding polarity terminal 1225", that is, it can be ensured that the corresponding polarity terminal 1225 first part can be inserted into the second channel 610, and in the z direction, the electrical connection part 1226 of the polarity terminal 1225 extends out of the second channel 610.

[0125] Generally, the shape of the two ports of the second channel 610 (for the convenience of description, the two ports are defined as the first port 612 and the second port 613 respectively, wherein the second port 613 is the port close to the electrical connection part 1226) is matched with the cross-sectional shape of the polar terminal 1225. If the two ports of the second channel 610 are circular holes and the cross section of the polar terminal 1225 is circular, the caliber of the second channel 610 needs to be slightly larger than the outer diameter of the first part of the polar terminal 1225. If the two ports of the second channel 610 are square holes and the cross section of the polar terminal 1225 is square, the area of the port of the second channel 610 needs to be slightly larger than the cross-sectional area of the first part of the polar terminal 1225.

[0126] After fixing the heat exchange pipe 131 on the top of the large capacity battery 12, the polar terminal 1225 is inserted into the corresponding second channel 610, and in the z direction, the electrical connection part 1226 of the polar terminal 1225 protrudes out of the second channel 610; the two ports of the second channel 610 are sealed with the corresponding polar terminal 1225.

[0127] The inner cavity of the heat exchange pipe 131 (i.e. the inner cavity of the first channel 611) serves as the flow cavity of the heat transfer medium, and the part of the polar terminal 1225 located in the inner cavity of the heat exchange pipe 131 is in direct contact with the heat transfer medium. With respect to the effect of indirectly exchanging heat between the polar terminal 1225 and the heat transfer medium through the tubular heat exchange part (for details, please refer to the large capacity battery disclosed in Chinese patent CN118299714A, in which the heat transfer medium indirectly exchanges heat with the polar terminal 1225 through the tubular heat exchange part), firstly, the heat exchange path is shortened (from "heat transfer medium-heat exchange part-polar terminal 1225" to "heat transfer medium-polar terminal 1225"), which can improve the utilization efficiency of the heat transfer medium; secondly, the heat exchange area is increased (from "a certain surface area of a clamping groove" to "the part of the polar terminal 1225 located in the inner cavity of the heat exchange pipe 131"), which improves the heat exchange efficiency, and further improves the heat exchange efficiency of the large capacity battery 12.

[0128] It should be noted that:

[0129] 1. Since the polar terminal 1225 of the utility model is in direct contact with the heat transfer medium, the ideal heat transfer medium should have good insulation, high specific heat capacity and thermal conductivity, good flame retardant performance, low cost, suitable working temperature, long service life, non-corrosive and other characteristics. In the utility model, the heat transfer medium is an insulating heat transfer medium commonly used in the prior art, which can be but is not limited to insulating oil and fluorinated liquid.

[0130] 2. Generally, two first heat exchange pipes 60 are used as the heat exchange device 13, and the two first heat exchange pipes 60 are respectively sleeved on the polar terminals 1225 on different sides (which can or can not be in contact with the top of the large capacity battery 12).

[0131] When the first heat exchange pipe 60 is in contact with the polar terminal 1225 and the top of the large capacity battery 12 at the same time, if the polar terminal 1225 is electrically connected to the top of the large capacity battery 12 through the first heat exchange pipe 60, a short circuit will occur, so the first heat exchange pipe 60 needs to be insulated from the top of the large capacity battery 12, or the first heat exchange pipe 60 needs to be insulated from the polar terminal 1225; of course, the first heat exchange pipe 60 can also be insulated from both the top of the large capacity battery 12 and the polar terminal 1225; that is, as long as the polar terminal 1225 cannot be electrically connected to the top of the large capacity battery 12 through the first heat exchange pipe 60.

[0132] The above problem can be solved in the following way:

[0133] 2.1, the first heat exchange pipe 60 is made of insulating material, which can realize insulation between the first heat exchange pipe 60 and the top of the large capacity battery 12 and the polar terminal 1225;

[0134] 2.2, the first heat exchange pipe 60 is made of non-insulating material, and an insulating pad, an insulating film or an insulating paint can be added between the top of the large capacity battery 12 and the first heat exchange pipe 60 to overcome the problem; an insulating pad, an insulating film or an insulating paint can also be added to the inner bottom surface of the first heat exchange pipe 60 (the surface of the first heat exchange pipe 60 close to the top of the large capacity battery 12) to overcome the problem; the wall of the first heat exchange pipe 60 can also be insulated, such as spraying insulating paint or wrapping insulating film, to overcome the problem; an insulating sealing ring can also be added between the polar terminal 1225 and the first heat exchange pipe 60 to overcome the problem; of course, to be on the safe side, multiple insulation methods can be combined to overcome the problem;

[0135] 3, usually, one of the above-mentioned second heat exchange pipes 61 is used as the heat exchange device 13, and two rows of second channel units are respectively sleeved on the polar terminals 1225 on different sides. Unlike the first heat exchange pipe 60, the second heat exchange pipe 61 is easy to contact with different polar terminals 1225 of the same single battery 122 at the same time, so the second heat exchange pipe 61 must be insulated from the polar terminal 1225 to avoid the two different polar terminals 1225 being electrically connected through the second heat exchange pipe 61, which will cause a short circuit. When the second heat exchange pipe 61 is insulated from the polar terminal 1225, the polar terminal 1225 cannot be electrically connected to the top of the large capacity battery 12 through the second heat exchange pipe 61.

[0136] The insulation between the second heat exchange pipe 61 and the polar terminal 1225 can be realized in the following way:

[0137] 3.1, the second heat exchange pipe piece 61 is selected from insulating materials, so that the insulation between the second heat exchange pipe piece 61 and the polarity terminal 1225 can be realized, and the insulation between the second heat exchange pipe piece 61 and the top of the large-capacity battery 12 can be realized;

[0138] 3.2, the second heat exchange pipe piece 61 is made of non-insulating materials, and an insulating sealing ring is additionally arranged between the polarity terminal 1225 and the second heat exchange pipe piece 61; the pipe wall of the second heat exchange pipe piece 61 is insulated, for example, by spraying insulating paint, wrapping insulating film and the like; in order to be safe, multiple insulation methods can be combined to overcome the problem.

[0139] The following will be described in detail Figures 3 to 12 , the large-capacity battery assembly 11 with the above two structure heat exchange pipe pieces 131 of the embodiment will be described in detail;

[0140] As shown in Figure 3 and Figure 4 , the structure schematic view and the sectional view of the large-capacity battery assembly 11 with the first heat exchange pipe piece 60 of the embodiment are respectively shown;

[0141] The structure of the first heat exchange pipe piece 60 is shown in Figure 6 and Figure 7 , which comprises a pipe body, the pipe body is provided with a first channel 611 and 12 second channels 610 (the 12 second channels 610 constitute a row of second channel units); the number of the second channels 610 is consistent with the number of the single batteries 122 in the large-capacity battery 12, and in other embodiments, the number of the second channels 610 can be adjusted according to the number of the single batteries 122 in the large-capacity battery 12.

[0142] The cross-sectional shape of the pipe body is not specifically limited in the utility model, since the heat exchange pipe piece 131 in the embodiment is placed on the top of the planar large-capacity battery 12, considering the structural regularity, it can be seen from the figure that the pipe body of the embodiment is a rectangular pipe. In other embodiments, a circular pipe or a pipe with other structural forms can also be used.

[0143] The first channel 611 described above is a channel opened along the length direction of the pipe body, in the utility model, after the heat exchange pipe piece 131 is fixed on the top of the large-capacity battery 12, the length direction of the pipe body is consistent with the arrangement direction of the single battery 122 (the arrangement direction of the single battery 122 is the x direction), therefore, the first channel 611 can be considered to extend along the x direction. The two end ports of the first channel 611 serve as the liquid inlet and outlet of the heat exchange pipe piece 131.

[0144] The second channel 610 is a channel through the pipe wall of the through pipe and communicates with the first channel 611, and in the utility model, after the heat exchange pipe 131 is fixed on the top of the large capacity battery 12, the extension direction of the second channel 610 is consistent with the height direction of the single battery 122 (the height direction of the single battery 122 is the z direction), therefore, the second channel 610 can be considered to extend along the z direction.

[0145] In addition, the plurality of second channels 610 need to correspond to the polarity terminals 1225 on the same side of the plurality of single batteries 122, when being fixed on the top of the large capacity battery 12, the electrical connection parts 1226 of the polarity terminals 1225 of each single battery 122 pass through the first ports 612 of the corresponding second channels 610 and extend out from the second ports 613, and the second ports 613 are the ports close to the electrical connection parts 1226 of the polarity terminals 1225.

[0146] The shapes of the two ports of the second channel 610 in the embodiment are adapted to the cross-sectional shape of the polarity terminal 1225, the shapes of the two ports of the second channel 610 are circular, the cross section of the polarity terminal 1225 is also circular, and the diameter of the two ports of the second channel 610 is slightly larger than the outer diameter of the polarity terminal 1225, in other embodiments, the shapes of the two ports of the second channel 610 and the cross-sectional shape of the polarity terminal 1225 can be different, as long as the polarity terminal 1225 can be inserted into the second channel 610.

[0147] From Figure 3 It can be seen from the above that the large capacity battery assembly 11 includes two first heat exchange pipes 60, the two first heat exchange pipes 60 are respectively sleeved on the polarity terminals 1225 on different sides based on the second channels 610, and the two first heat exchange pipes 60 are connected in series through the connecting pipe 7, in other embodiments, the two first heat exchange pipes 60 can also be connected in parallel.

[0148] In the embodiment, the first heat exchange pipe 60 made of insulating material realizes the insulation between the first heat exchange pipe 60 and the top of the large capacity battery 12 and the polarity terminal 1225.

[0149] In addition, because the insulating heat transfer medium flows in the heat exchange pipe 131, the sealing between the heat exchange pipe 131 and the polarity terminal 1225 is particularly important.

[0150] From Figure 8As can be seen, the second annular groove along the circumference of each polarity terminal 1225 can be opened on the side wall of the polarity terminal 1225, and the second annular sealing gasket 63 can be sleeved in the second annular groove of each polarity terminal 1225; the outer edge bottom surface of the second annular sealing gasket 63 is sealingly connected with the first heat exchange pipe 60, so as to realize the sealing between the second port 613 of each second channel 610 and the corresponding polarity terminal 1225. The upper end surface of the insulating member 1224 serves as the supporting surface of the first heat exchange pipe 60, and a sealing glue layer or a sealing gasket is coated or added between the insulating member 1224 and the first heat exchange pipe 60, so as to realize the sealing between the first port 612 of each second channel 610 and the corresponding polarity terminal 1225.

[0151] Since the second annular sealing gasket 63 is embedded in the second annular groove, the second annular sealing gasket 63 cooperates with the insulating member 1224 and can also limit the first heat exchange pipe 60 in the z direction, thereby improving the stability of the first heat exchange pipe 60.

[0152] It should be noted that:

[0153] 1. Since the second annular sealing gasket 63 needs to be embedded in the second annular groove, the second annular sealing gasket 63 needs to have a certain elasticity in the radial direction thereof, so as to be sleeved on the polarity terminal 1225 and embedded in the second annular groove through the electrical connection part 1226.

[0154] 2. The sealing connection mode between the outer edge bottom surface of the second annular sealing gasket 63 and the first heat exchange pipe 60 can be selected according to the material of the first heat exchange pipe 60. For example, the first heat exchange pipe 60 in the embodiment is made of insulating material, so that the sealing connection between the two can be realized by coating sealing glue between the outer edge of the second annular sealing gasket 63 and the first heat exchange pipe 60. When the first heat exchange pipe 60 is made of metal material, a sealing gasket can be added between the two, and the sealing connection between the two can be realized by screws.

[0155] From Figure 9 As can be seen, the second annular groove along the circumference of each polarity terminal 1225 can be opened on the side wall of the polarity terminal 1225, and the second annular sealing gasket 63 can be sleeved in the second annular groove of each polarity terminal 1225; the outer edge bottom surface of the second annular sealing gasket 63 is sealingly connected with the first heat exchange pipe 60, so as to realize the sealing between the second port 613 of each second channel 610 and the corresponding polarity terminal 1225. The upper end surface of the insulating member 1224 serves as the supporting surface of the first heat exchange pipe 60, and a sealing glue layer or a sealing gasket is coated or added between the insulating member 1224 and the first heat exchange pipe 60, so as to realize the sealing between the first port 612 of each second channel 610 and the corresponding polarity terminal 1225. The upper end surface of the insulating member 1224 serves as the supporting surface of the first heat exchange pipe 60, and a sealing glue layer or a sealing gasket is coated or added between the insulating member 1224 and the first heat exchange pipe 60, so as to realize the sealing between the first port 612 of each second channel 610 and the corresponding polarity terminal 1225.

[0156] Similarly, since the first annular sealing gasket 62 is sealingly connected with the polar terminal 1225, the first annular sealing gasket 62 cooperates with the insulating member 1224 to limit the first heat exchange pipe 60 in the z direction, thereby improving the stability of the first heat exchange pipe 60.

[0157] It should be noted that:

[0158] The material of the first annular sealing gasket 62 and the sealing connection mode between the first annular sealing gasket 62 and the polar terminal 1225 and the first heat exchange pipe 60 can be selected according to the material of the first heat exchange pipe 60. For example, the first heat exchange pipe 60 in the embodiment is made of insulating material, so the first annular sealing gasket 62 made of metal material can be selected. The first annular sealing gasket 62 and the polar terminal 1225 can be sealingly connected by welding, and the first annular sealing gasket 62 and the first heat exchange pipe 60 can be sealingly connected by bonding. When the first heat exchange pipe 60 is made of metal material, the first annular sealing gasket 62 and the polar terminal 1225 and the first heat exchange pipe 60 can be sealingly connected by welding.

[0159] In other embodiments, an O-ring can also be added between the polar terminal 1225 and the two ports of the second channel 610 to achieve sealing.

[0160] As shown in Figure 10 and Figure 11 , it is a large-capacity battery assembly 11 using the second heat exchange pipe 61. The structure of the second heat exchange pipe 61 is specifically shown in Figure 12 . Unlike the first heat exchange pipe 60, it includes two rows of second channel units, and the plurality of second channels 610 and all polar terminals 1225 of the plurality of single batteries 122 correspond one by one. That is, in the embodiment, all the polar terminals 1225 are partially located in the same first channel 611.

[0161] Sealing plates can be added at both ends of the first channel 611, and the sealing plates are provided with openings as the liquid inlet and outlet of the second heat exchange pipe 61, respectively.

[0162] The second heat exchange pipe 61 made of insulating medium is also used to achieve insulation between the second heat exchange pipe 61 and the polar terminal 1225. The sealing mode between each polar terminal 1225 and the two ports of the second channel 610 is the same as above, which will not be described here.

[0163] It is to be explained that, because the second heat exchange pipe 61 substantially covers the top of the large capacity battery 12, it is not convenient to set the gas sharing chamber 124 with a large z-direction size on the top of such a large capacity battery 12, and each single battery 122 can be in gas communication through the through hole of the upper cover plate 1221, so as to achieve gas balance.

[0164] In other embodiments, the heat exchange device 13 can also be a half-pipe structure (the half-pipe can be understood as being divided into two halves along the axial direction of the whole pipe, and each half is a half-pipe), and a through hole is formed in the pipe wall for the polar terminal 1225 electrical connection part 1226 to pass through. The heat exchange device 13 is sealed and buckled on the top of the large capacity battery 12, and the space between the half-pipe and the top of the large capacity battery 12 serves as a heat transfer medium flow space. The polar terminal 1225 part structure is located in the heat transfer medium flow chamber, and the corresponding through hole for the polar terminal 1225 electrical connection part 1226 to pass through.

[0165] Embodiment 2

[0166] Different from embodiment 1, referring to Figures 4 to 5 In this embodiment, two first annular grooves 14 are formed in the side wall of the polar terminal 1225, and the two first annular grooves 14 are arranged along the height direction of the polar terminal 1225. Each first annular groove 14 extends along the circumferential direction of the side wall of the polar terminal 1225. Based on the two first annular grooves 14, the heat exchange area of the part of the polar terminal 1225 can be increased. After the part is located in the inner cavity of the heat exchange device 13, a better heat exchange effect can be obtained compared with the polar terminal 1225 with a smooth side wall.

[0167] In other embodiments, the number, groove width and groove depth of the first annular groove 14 can be adjusted according to requirements, and the conductive performance of the polar terminal 1225 is not affected.

[0168] In other embodiments, other structures can also be processed on the polar terminal 1225 to increase the heat exchange area of the polar terminal 1225. In order to facilitate description, in the utility model, the structures that can increase the heat exchange area of the polar terminal 1225 are collectively referred to as functional structures. Such functional structures can include point-shaped pits, protrusions and the like located in the side wall of the polar terminal 1225, and can also be through holes formed on the polar terminal. Compared with the above-mentioned functional structures, the first annular groove 14 structure of this embodiment is convenient to process and has a low processing cost.

[0169] Embodiment 3

[0170] This embodiment is another large capacity battery assembly 11. Different from the above-mentioned embodiments, on the basis of the above-mentioned embodiments, a second insulating sealing glue layer 15 is laid on the top of the large capacity battery 12.

[0171] The specific structure is as shown in Figure 13 and Figure 14 Taking the example of adding a second insulating sealing glue layer 15 on the basis of the large-capacity battery assembly 11 as shown in Figure 3 and Figure 4 The second insulating sealing glue layer 15 is covered on the top of the large-capacity battery 12 and cooperates with the first insulating sealing glue layer 129 to wrap the first heat exchange pipe 60.

[0172] In order to improve the stability of the second insulating sealing glue layer 15, the large-capacity battery 12 shell 121 can also be subjected to a plastic spraying treatment. On the one hand, the insulating of the aluminum shell 121 can be realized, and on the other hand, compared with the bonding strength with the aluminum shell 121, the insulating sealing glue is easier to bond with the plastic spraying outer layer and has a higher bonding strength, thereby making the second insulating sealing glue layer 15 have a higher stability. In addition, the bonding strength of the two can be made better by matching the type of the plastic spraying material and the second insulating sealing glue.

[0173] The first insulating sealing glue layer 129 and the second insulating sealing glue layer 15 can be regarded as a whole, which can not only realize the sealing of the avoiding hole 120 part, but also has at least the following advantages:

[0174] I. Further improve the sealing performance of each part of the heat exchange pipe 131;

[0175] Specifically, when the sealing mode of embodiment 1 is adopted, after the sealing between the two ports of the second channel 610 and the polarity terminal 1225 is completed, if there is still a small gap between the two ports of the second channel 610 and the polarity terminal 1225, the insulating sealing glue constituting the second insulating sealing glue layer 15 seeps into the small gap between the two ports of the second channel 610 and the polarity terminal 1225, and further seals the gap from the radial direction (the insulating sealing glue cannot flow into the first channel 611 through the small gap);

[0176] II. Anti-condensation;

[0177] During a long period of use, due to the temperature difference between the inside and outside of the heat exchange pipe 131, condensation will be generated on the surface. When the condensation accumulates to a certain amount, it may cause a short circuit problem. By laying the second insulating sealing glue layer 15 on the top of the heat exchange pipe 131, when condensation is generated on the surface of the heat exchange pipe 131, the battery short circuit can be prevented under the protection of the second insulating sealing glue layer 15;

[0178] III. Realize the insulation of the heat exchange pipe 131 and the top of the large-capacity battery 12;

[0179] When the heat exchange pipe 131 is made of non-insulating material, the insulation of the heat exchange pipe 131 can be realized when the insulating sealant completely wraps the outside of the heat exchange pipe 131, further improving the insulation performance of the heat exchange pipe 131 and the top of the large-capacity battery 12.

[0180] Four, improve the stability of the heat exchange pipe 131;

[0181] Because the heat exchange pipe 131 is completely wrapped by the second insulating sealant layer 15, the stability of the heat exchange pipe 131 on the large-capacity battery 12 can be further improved.

[0182] From Figure 13 and Figure 14 It can also be seen that the electrical connection part 1226 of each polarity terminal 1225 extends out of the second insulating sealant layer 15 to facilitate connection with the electrical connection assembly. The electrical connection assembly is an electrical connection for realizing parallel connection of each single battery 122 in the large-capacity battery 12 and / or series connection of adjacent large-capacity batteries 12. At the same time, the liquid inlet end and the liquid outlet end of the heat exchange pipe 131 are exposed to the second insulating sealant layer 15, facilitating connection with an external heat exchange device storing a heat transfer medium.

[0183] In other embodiments, the electrical connection assembly can be connected with the polarity terminal 1225, and then the second insulating sealant layer 15 is laid on the top of the large-capacity battery 12, that is, the second insulating sealant layer 15 completely covers the polarity terminal 1225 of the single battery 122 and the connection part of the electrical connection assembly and the polarity terminal 1225; in the entire large-capacity battery 12, after the shell 121 is insulated, only the free end of the electrical connection assembly (for realizing series connection of the large-capacity battery 12) is exposed and charged, and the rest is insulated, so that such a large-capacity battery 12 has higher safety performance.

[0184] In order to prevent overflow during the glue injection process, the partial structure of the shell 121 is used as a glue blocking plate in the present embodiment. The structure of the shell 121 of the present embodiment will be described in detail below in combination with Figure 15 and Figure 16 .

[0185] As shown in Figure 15 , it is an exploded structure diagram of the shell 121 of the present embodiment, which is disassembled into a cylinder 17 with open ends and an end plate 18 covering the open ends of the cylinder 17. The structure of the cylinder 17 is shown in Figure 16 , both ends of the cylinder 17 are open, that is, the open ends of the cylinder 17 are parallel to the yz plane; in the z direction, the height of the cylinder side plate 171 is higher than the height of the cylinder top plate 172; the part of the cylinder side plate 171 higher than the cylinder top plate 172 is used as a glue blocking plate. The cylinder 17 can be integrally formed by aluminum extrusion process, which is convenient to process, and at the same time, has good sealing performance compared with a split structure.

[0186] In addition, the top of the large-capacity battery assembly 11 can also be provided with an insulation protective cover 19 (as shown in Figure 2 and Figure 20 , and the insulation protective cover 19 is used as a glue injection mold in this embodiment, so that demolding is not required after glue injection, and the bonding strength of the insulation protective cover 19 and the top of the large-capacity battery assembly 11 can be improved. In addition, if the polarity terminal is directly exposed to the external environment, there is a great safety hazard due to the electrification of the polarity terminal during use. Therefore, the insulation protective cover 19 provided on the top of the large-capacity battery assembly 11 can also provide insulation protection for the polarity terminal, avoiding the safety hazard that may exist due to the exposure of the polarity terminal during the operation of the large-capacity battery assembly 11, and also avoiding the problem that foreign matters in the external environment fall into the position of the polarity terminal to cause the short circuit of the large-capacity battery assembly 11, thereby improving the safety of the large-capacity battery assembly 11.

[0187] Embodiment 4

[0188] The energy storage device of this embodiment includes a temperature control system 2 and at least one battery cluster. The battery cluster includes at least one battery pack 1, and each battery pack 1 includes at least one large-capacity battery assembly 11 in the above-mentioned embodiments.

[0189] The structure of the temperature control system 2 is shown in Figure 17 , which includes a heat transfer unit 22 and a heat treatment unit 23; the heat transfer unit 22 is used to realize the delivery of the heat transfer medium between the heat exchange device 13 in each large-capacity battery assembly 11 and the heat treatment unit 23 (only one heat exchange device 13 is shown in Figure 17 ); and the heat treatment unit 23 is used to heat or cool the heat transfer medium in the heat transfer unit 22.

[0190] The heat transfer unit 22 of this embodiment includes a liquid supply pipe assembly 233, a liquid outlet pipe assembly 234, a liquid inlet pipe assembly 231, and a liquid return pipe assembly 232; the liquid supply pipe assembly 233 and the liquid outlet pipe assembly 234 mainly realize the delivery of the heat transfer medium between the heat treatment unit 23 and each battery cluster, and the liquid inlet pipe assembly 231 and the liquid return pipe assembly 232 realize the delivery of the heat transfer medium in each battery cluster. In Figure 17 , only three sets of liquid inlet pipe assemblies 231 and liquid return pipe assemblies 232 are shown, and only the pipes corresponding to one battery pack 1 in the battery cluster are shown in each set of liquid inlet pipe assembly 231 and liquid return pipe assembly 232.

[0191] In specific operation, the liquid supply pipeline assembly 233 delivers the heat transfer medium in the heat treatment unit 23 to each battery cluster, and the liquid outlet pipeline assembly 234 collects the heat-exchanged heat transfer medium from each battery cluster to the heat treatment unit 23. In each battery cluster, the liquid inlet pipeline assembly 231 distributes the heat transfer medium in the liquid supply pipeline assembly 233 to each large-capacity battery assembly 11 in the battery pack 1, and the liquid return pipeline assembly 232 collects the heat-exchanged heat transfer medium from the plurality of large-capacity battery assemblies 11 to the liquid outlet pipeline assembly 234. The heat transfer medium forms a circulation loop with the heat treatment unit 23 through the liquid supply pipeline assembly 233, the liquid outlet pipeline assembly 234, the liquid inlet pipeline assembly 231, and the liquid return pipeline assembly 232, thereby controlling the temperature of the large-capacity battery assemblies 11 in each battery cluster.

[0192] The pipeline arrangement of the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 will be described in detail below.

[0193] If the number of battery clusters in the energy storage device is one, the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 are each a single pipeline. The two ends of the liquid supply pipeline assembly 233 are connected to the liquid inlet pipeline assembly 231 and the heat treatment unit 23, respectively, and the two ends of the liquid outlet pipeline assembly 234 are connected to the liquid return pipeline assembly 232 and the heat treatment unit 23, respectively, to realize the delivery of the heat transfer medium.

[0194] If the number of battery clusters in the energy storage device is N, where N is greater than 1, and the N battery clusters are arranged in a matrix, the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 are each a combination of multiple pipelines, and the pipeline arrangement is adjusted according to the arrangement of the battery clusters. The specific arrangement is as follows:

[0195] First, the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 each include N liquid supply pipelines and N liquid outlet pipelines. The N liquid supply pipelines are each connected to one of the liquid inlet pipeline assemblies 231 in the N battery clusters, and the other end is connected to the heat treatment unit 23. The N liquid outlet pipelines are each connected to one of the liquid return pipeline assemblies 232 in the N battery clusters, and the other end is connected to the heat treatment unit 23. That is, each battery cluster is connected to the heat treatment unit 23 using an independent pipeline. This kind of pipeline arrangement requires a large number of pipelines for installation and manufacturing, and the heat treatment unit 23 also needs to be provided with N liquid inlet ports 2411 and N liquid outlet ports 2412, making the structure of the heat treatment unit 23 more complex.

[0196] Second, as shown in FIG. 6, the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 each include N liquid supply pipelines and N liquid outlet pipelines. The N liquid supply pipelines are each connected to one of the liquid inlet pipeline assemblies 231 in the N battery clusters, and the other end is connected to the heat treatment unit 23. The N liquid outlet pipelines are each connected to one of the liquid return pipeline assemblies 232 in the N battery clusters, and the other end is connected to the heat treatment unit 23. That is, each battery cluster is connected to the heat treatment unit 23 using an independent pipeline. This kind of pipeline arrangement requires a large number of pipelines for installation and manufacturing, and the heat treatment unit 23 also needs to be provided with N liquid inlet ports 2411 and N liquid outlet ports 2412, making the structure of the heat treatment unit 23 more complex. Figure 18As shown, the liquid supply pipeline assembly 233 includes a first shunt pipe 2331, a second shunt pipe 2332, and a third shunt pipe 2333; the inlet of the first shunt pipe 2331 is used to connect with the heat treatment unit 23; the second shunt pipe 2332 is used to shunt the heat transfer medium in the first shunt pipe 2331 to different column or different row battery clusters; and the third shunt pipe 2333 is used to shunt the heat transfer medium in the second shunt pipe 2332 to the same column or the same row battery cluster.

[0197] The liquid outlet pipeline assembly 234 includes a first confluence pipe 2341, a second confluence pipe 2342, and a third confluence pipe 2343; the third confluence pipe 2343 is used to converge the heat transfer medium in the same column or the same row battery cluster to the second confluence pipe 2342; the second shunt pipe 2332 is used to converge the heat transfer medium in different column or different row battery clusters to the first confluence pipe 2341; and the outlet of the first confluence pipe 2341 is used to connect with the heat treatment unit 23.

[0198] The liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 are made of multiple levels of pipelines, so that the heat transfer medium flowing out of the heat treatment unit 23 is shunted and evenly distributed to each battery cluster in stages, and the flow of the heat transfer medium distributed to each battery cluster is balanced, so that each battery cluster and each large-capacity battery assembly 11 in the battery cluster have good and balanced heat dissipation effect, thereby improving the working stability and service life of the energy storage equipment. At the same time, the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 are made of multiple levels of pipelines, so that the heat treatment unit 23 only needs to be provided with one liquid inlet 2411 and one liquid outlet 2412, and the structure of the heat treatment unit 23 is relatively simple. In addition, the entire pipeline is relatively convenient to manufacture and install.

[0199] The embodiment can also be provided with a water supplement joint on the first shunt pipe 2331 for supplementing the heat transfer medium for the temperature control system 2, and an exhaust valve on the first confluence pipe 2341 for exhausting air in the temperature control system 2. The water supplement joint and the exhaust valve work in cooperation to enable the temperature control system 2 to efficiently control the temperature of each large-capacity battery assembly 11 and improve the temperature control effect of the temperature control system 2.

[0200] After the heat transfer medium treated by the heat treatment unit 23 is shunted to the multiple battery clusters by the liquid supply pipeline assembly 233, each battery cluster realizes the transportation of the heat transfer medium of each large-capacity battery assembly 11 in the battery cluster through the liquid inlet pipeline assembly 231 and the liquid return pipeline assembly 232. The pipeline arrangement of the liquid inlet pipeline assembly 231 and the liquid return pipeline assembly 232 is described in detail below.

[0201] The inlet and return lines 231 and 232 are installed and manufactured based on the number of battery packs 1 in the battery cluster and the number and arrangement of the large-capacity battery assemblies 11. In this embodiment, multiple large-capacity battery assemblies 11 are arranged horizontally (in the xy plane, along the y direction) to form a battery pack 1. Subsequently, multiple battery packs 1 are arranged vertically (in the z direction) to form a battery cluster. In this case, the inlet and return lines 231 and 232 can be manufactured in the following manner:

[0202] First, the liquid inlet and return line assemblies 231 and 232, along with the heat exchanger 13, are manufactured using an integrated pipeline. This means that the entire energy storage device consists of a single pipeline for the flow of heat transfer medium. This pipeline is bent multiple times, both vertically and horizontally, and is sequentially connected to the polarity terminals 1225 of the multiple large-capacity battery assemblies 11. This installation method requires numerous bends in the pipeline, placing high demands on pipeline quality. Furthermore, during installation, the entire pipeline must be sequentially connected to the polarity terminals 1225 of each large-capacity battery assembly 11, resulting in relatively poor installation reliability and convenience, and prone to errors after installation.

[0203] Second, if Figure 17 、 Figure 19 and Figure 20 As shown, the liquid inlet pipeline assembly 231, the liquid return pipeline assembly 232 and the heat exchange device 13 are manufactured and installed separately, and the liquid inlet pipeline assembly 231 and the liquid return pipeline assembly 232 are manufactured through multi-stage pipelines.

[0204] The liquid inlet pipe assembly 231 specifically includes a primary liquid inlet pipe 2311, multiple secondary liquid inlet pipes 2312 and multiple tertiary liquid inlet pipes 2313; the liquid inlet port 2411 of the primary liquid inlet pipe 2311 is connected to the liquid supply pipe assembly 233; the multiple secondary liquid inlet pipes 2312 correspond one to one with the battery packs 1 in the battery cluster; the multiple secondary liquid inlet pipes 2312 are all connected to the primary liquid inlet pipe 2311, and each secondary liquid inlet pipe 2312 provides heat transfer medium to the corresponding battery pack 1, that is, the multiple secondary liquid inlet pipes 2312 divert the heat transfer medium in the primary liquid inlet pipe 2311 to the corresponding battery pack 1 one by one; the multiple tertiary liquid inlet pipes 2313 are connected to the primary liquid inlet pipe 2311, and each secondary liquid inlet pipe 2312 provides heat transfer medium to the corresponding battery pack 1. The three-stage liquid inlet pipe 2313 corresponds one-to-one to the large-capacity battery components 11 in the battery cluster; for each battery pack 1, multiple three-stage liquid inlet pipes 2313 are connected to the secondary liquid inlet pipe 2312 corresponding to the battery pack 1, and at the same time, each three-stage liquid inlet pipe 2313 is respectively connected to the liquid inlet end of the heat exchange device 13 of the large-capacity battery components 11 in the battery pack 1, and each three-stage liquid inlet pipe 2313 provides heat transfer medium to the heat exchange device 13 of the large-capacity battery components 11, that is, multiple three-stage liquid inlet pipes 2313 divert the heat transfer medium in the secondary liquid inlet pipe 2312 to multiple large-capacity battery components 11.

[0205] The return liquid pipeline assembly 232 specifically comprises a primary liquid outlet pipe 2321, a plurality of secondary liquid outlet pipes 2322, and a plurality of tertiary liquid outlet pipes 2323; the plurality of secondary liquid outlet pipes 2322 correspond to the battery packs 1 in the battery cluster one by one; the plurality of tertiary liquid outlet pipes 2323 correspond to the large-capacity battery assemblies 11 in the battery cluster one by one; for each battery pack 1, one end of each tertiary liquid outlet pipe 2323 is connected to the liquid outlet port of the heat exchange device 13 of each large-capacity battery assembly 11 in the battery pack 1, and the other end of each tertiary liquid outlet pipe 2323 is connected to the corresponding secondary liquid outlet pipe 2322 of the battery pack 1, thereby converging the heat transfer medium after heat exchange of the plurality of large-capacity battery assemblies 11 into the secondary liquid outlet pipe 2322; each secondary liquid outlet pipe 2322 is connected to the primary liquid outlet pipe 2321, thereby converging the heat transfer medium after heat exchange of the plurality of battery packs 1 into the primary liquid outlet pipe 2321; and the primary liquid outlet pipe 2321 is connected to the liquid outlet pipeline assembly 234.

[0206] The tertiary liquid inlet pipe 2313 and the tertiary liquid outlet pipe 2323 can be made of a flexible pipe, specifically a metal bellows pipe, which reduces the installation error with the large-capacity battery assembly 11 and reduces the installation requirements on site, thereby further increasing the installation convenience of the temperature control pipeline assembly.

[0207] The liquid inlet pipeline assembly 231 and the return liquid pipeline assembly 232 are made of multi-stage pipelines, so that the heat transfer medium flowing out of the liquid supply pipeline assembly 233 is distributed step by step and evenly to each large-capacity battery assembly 11, and the heat transfer medium flow distributed to each large-capacity battery assembly 11 is balanced, so that each large-capacity battery assembly 11 in the battery cluster has a good and balanced heat dissipation effect, thereby improving the working stability and service life of the energy storage equipment.

[0208] The secondary liquid inlet pipe 2312 and the secondary liquid outlet pipe 2322 can be formed by splicing multiple sections of pipes, i.e., the secondary liquid inlet pipe 2312 and the secondary liquid outlet pipe 2322 can be formed by splicing multiple sections of pipes and a three-way joint. This splicing type connection reduces the error and assembly difficulty when connecting the pipelines, and is very convenient to install and disassemble. At the same time, when subsequent maintenance is required, only the pipeline connector of the relevant large-capacity battery assembly 11 needs to be disassembled for maintenance, without the need to disassemble the entire temperature control pipeline assembly, thereby facilitating installation and maintenance.

[0209] As shown in FIG. 6, the liquid inlet pipeline assembly 231 and the return liquid pipeline assembly 232 are connected to the liquid supply pipeline assembly 233 through the liquid inlet pipeline assembly 231 and the return liquid pipeline assembly 232. Figure 19As shown, in order to further facilitate connection, the secondary liquid outlet pipe 2322 is connected with the primary liquid outlet pipe 2321 by using a quick connector 236 and a hose 235. The hose 235 reduces the installation error when the secondary liquid outlet pipe 2322 is connected with the primary liquid outlet pipe 2321, reduces the installation requirement on site, and further increases the installation convenience of the temperature control pipeline assembly. The quick connector 236 can realize quick installation of the secondary liquid outlet pipe 2322 and the primary liquid outlet pipe 2321, and can be directly plugged and unplugged without tools, thereby improving the convenience of installation or disassembly. In addition, the quick connector 236 also has a bidirectional self-sealing function. During plugging and unplugging of the quick connector 236, the flow of liquid can be automatically cut off, so that when the large-capacity battery assembly 11 and the pipeline assembly are maintained, the heat transfer medium in each pipeline does not need to be emptied, the convenience of maintenance is improved, the disassembly of the pipeline is improved, and the subsequent maintenance and replacement of the main pipeline are facilitated.

[0210] In addition, all or part of the pipelines of the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234, the liquid inlet pipeline assembly 231, and the liquid return pipeline assembly 232 are provided with a heat preservation layer. The heat preservation layer can effectively prevent the loss of cold or heat of the heat transfer medium, reduce energy consumption, and avoid condensation on the walls of the pipelines. At the same time, the diameters of the pipelines gradually decrease from the heat treatment unit 23 to the large-capacity battery assembly 11, that is, the diameter of the primary shunt pipe 2331 > the diameter of the secondary shunt pipe 2332 > the diameter of the tertiary shunt pipe 2333 > the diameter of the primary liquid inlet pipe 2311 > the diameter of the secondary liquid inlet pipe 2312 > the diameter of the tertiary liquid inlet pipe 2313 > the diameter of the primary liquid outlet pipe 2321 > the diameter of the secondary liquid outlet pipe 2322 > the diameter of the tertiary liquid outlet pipe 2323. This arrangement makes the flow deviation of the heat transfer medium for heat exchange with each large-capacity battery assembly 11 smaller, reduces the temperature difference of the large-capacity battery assembly 11, and improves the service life of the large-capacity battery assembly 11.

[0211] As shown in FIGS. 1 and 2, Figure 21 and Figure 23 As shown, the heat treatment unit 23 in the embodiment includes a temperature control machine 241. The temperature control machine 241 is used for heating or cooling the heat transfer medium delivered by the heat delivery unit 22. The temperature control machine 241 is a device with heating and / or cooling functions, such as a cooling and heating machine or a water chiller.

[0212] The temperature control machine 241 is generally provided with a liquid inlet 2411 and a liquid outlet 2412, and the temperature control machine 241 is connected with the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 through the liquid inlet 2411 and the liquid outlet 2412. At this time, in order to facilitate maintenance, the liquid inlet 2411 and the liquid outlet 2412 of the temperature control machine 241 are provided with a blocking joint 44, which can block the heat transfer medium in the temperature control machine 241 when the temperature control machine 241 is installed and removed.

[0213] As shown in Figure 22 The blocking joint 44 includes a joint end pipe 441, an adjusting valve 442 and two welding chucks 443. One end of the adjusting valve 442 is connected with the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 through the welding chuck 443, and the other end is connected with the joint end pipe 441 through the welding chuck 443. The joint end pipe 441 is used to connect with the liquid inlet 2411 and the liquid outlet 2412 of the temperature control machine 241. The adjusting valve 442 can be a butterfly valve. When the temperature control machine 241 is working normally, the adjusting valve 442 is in a normally open state, and the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 are in a normal flow state with the heat transfer medium in the temperature control machine 241. When the temperature control machine 241 needs to be removed and maintained, the adjusting valve 442 is closed, and the blocking joint 44 blocks the inflow and outflow of the heat transfer medium in the temperature control machine 241. At this time, the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 are in a disconnected state with the heat transfer medium in the temperature control machine 241, and then the temperature control machine 241 can be directly removed from the liquid supply pipeline assembly 233 and the liquid outlet pipeline assembly 234 without the need for corresponding liquid discharge operation, thereby improving the convenience and reliability during maintenance.

[0214] As shown in Figure 23 The heat treatment unit 23 of the embodiment can further include a radiator 242 and a control valve 243. The liquid inlet 2411 of the temperature control machine 241 is connected with the liquid outlet pipeline assembly 234, and the liquid outlet 2412 of the temperature control machine 241 is connected with the liquid supply pipeline assembly 233, which is used to heat or cool the heat transfer medium. The control valve 243 is used to control whether the heat transfer medium enters the radiator 242. The liquid inlet and the liquid outlet of the radiator 242 are connected with the liquid outlet pipeline assembly 234, which is used to dissipate heat of the heat transfer medium.

[0215] The radiator 242 dissipates heat of the heat transfer medium, which can be a heat dissipation coil pipe and exchanges heat with the external environment to reduce the temperature of the heat transfer medium.

[0216] The control valve 243 can be a valve with different control modes or structures, as long as it can control the on-off of the heat transfer medium. For example, it can be a pneumatic valve, an electric valve, a hydraulic valve, etc. For convenient control, an electric valve is preferred. The electric valve is convenient to control, easy to operate, and easy to install on site. The control valve 243 in this embodiment includes a three-way electric valve. The first port of the three-way electric valve is in communication with the liquid inlet 2411 of the temperature control machine 241, the second port is in communication with the liquid outlet pipe assembly 234, and the third port is in communication with the liquid outlet of the radiator 242. When the three-way electric valve is used for control, only a single device is needed to achieve control, and the structure is simple and easy to install.

[0217] In this embodiment, a fan is further arranged on the outside of the radiator 242 to further dissipate heat from the heat transfer medium in the radiator 242. The large-capacity battery assembly 11 can generate a large amount of heat during charging and discharging. In order to dissipate the heat and utilize the ambient temperature as much as possible, the fan is arranged. In this way, even in a high-temperature condition of 40°C, the temperature of the large-capacity battery assembly 11 can be ensured to be below 50°C. The control of the temperature of the large-capacity battery assembly 11 is mainly an energy consumption problem. The use of air conditioning and other refrigeration equipment has high energy consumption. Therefore, the ambient temperature is used as much as possible to control the temperature of the large-capacity battery assembly 11.

[0218] The working modes of the temperature control system 2 include the following three modes:

[0219] The first mode is the radiator 242 alone cooling mode.

[0220] As shown in Figure 24 When the temperature of the large-capacity battery assembly 11 reaches the first high-temperature threshold, the first port and the third port of the three-way electric valve are in communication, and the second port is closed. The heat transfer medium in the heat exchange device 13 exchanges heat with the large-capacity battery assembly 11. Then, the heat transfer medium in the heat exchange device 13 enters the radiator 242 through the liquid outlet pipe assembly 234. The radiator 242 processes the heat in the heat transfer medium. Then, the heat transfer medium with reduced temperature enters the temperature control machine 241. At this time, the temperature control machine 241 does not work, but only ensures the passage of the heat transfer medium. Then, the heat transfer medium returns to the heat exchange device 13 through the liquid supply pipe assembly 233 and exchanges heat with the large-capacity battery assembly 11 again, so as to realize passive cooling through the radiator 242.

[0221] The second mode is the temperature control machine 241 alone cooling and heating mode.

[0222] As shown in Figure 25As shown, when the temperature of the large-capacity battery assembly 11 reaches the second high temperature threshold, the first port and the second port of the three-way electric valve are connected, and the third port is closed, and the heat exchange device 13 exchanges heat with the large-capacity battery assembly 11. Subsequently, the heat transfer medium in the heat exchange device 13 enters the temperature controller 241 through the liquid outlet pipeline assembly 234. At this time, the temperature controller 241 works to actively cool the heat transfer medium. Subsequently, the cooled heat transfer medium returns to the heat exchange device 13 through the liquid supply pipeline assembly 233 to exchange heat with the large-capacity battery assembly 11, thereby achieving active cooling through the temperature controller 241.

[0223] When the temperature of the large-capacity battery assembly 11 reaches the low-temperature threshold, the first port and the second port of the three-way electric valve are connected, and the third port is closed. The temperature controller 241 works to heat up the heat transfer medium in the temperature control tube. The heated heat transfer medium returns to the heat exchange device 13 through the liquid supply pipeline assembly 233 to exchange heat with the large-capacity battery assembly 11, thereby achieving active heating through the temperature controller 241.

[0224] The third type is a cooling mode in which the radiator 242 and the temperature controller 241 cool down together:

[0225] like Figure 24 As shown, when the temperature of the large-capacity battery assembly 11 reaches the third high temperature threshold, the first port and the third port of the three-way electric valve are connected, and the second port is closed. The heat transfer medium of the heat exchange device 13 exchanges heat with the large-capacity battery assembly 11. Subsequently, the heat transfer medium in the heat exchange device 13 enters the radiator 242 through the liquid outlet pipeline assembly 234. The radiator 242 processes the heat in the heat transfer medium. Subsequently, the heat transfer medium with reduced temperature enters the temperature controller 241. At this time, the temperature controller 241 is turned on to cool the heat transfer medium. Subsequently, the heat transfer medium returns to the heat exchange device 13 through the liquid supply pipeline assembly 233 and exchanges heat with the large-capacity battery assembly 11 again, thereby achieving passive cooling and active cooling through the radiator 242 and the temperature controller 241.

[0226] It should be noted that: the third high temperature threshold>the second high temperature threshold>the first high temperature threshold.

[0227] The heat treatment unit 23 performs a combined active heat dissipation, active temperature increase, and passive heat dissipation on the large-capacity battery assembly 11 through the radiator 242 and the temperature controller 241. This method can not only ensure that the heat of the large-capacity battery assembly 11 can be effectively processed, but also has a low temperature control cost, which can effectively save energy, avoid the waste of energy when only active temperature control is used, and avoid the defect of not being able to timely control the temperature of the large-capacity battery assembly 11 when only passive temperature control is used. This configuration allows the heat treatment unit 23 to fully exchange heat with the external environment, fully utilizing the temperature of the external environment, thereby shortening the time of active cooling and saving energy.

Claims

1. An energy storage device, characterized by: The battery pack includes a temperature control system and at least one battery cluster; Each battery cluster includes at least one battery pack, and each battery pack includes at least one large-capacity battery assembly; each large-capacity battery assembly includes a large-capacity battery and a heat exchange device; The large-capacity battery includes a shell and a plurality of single batteries; the plurality of single batteries are arranged in the shell cavity along the x direction, and the shell is provided with at least one shared chamber, the shared chamber cavity and all single battery cavities are through; the shell top plate is provided with a plurality of avoiding holes corresponding to the polarity terminals of each single battery; the polarity terminals of each single battery extend out of the corresponding avoiding holes, and the shell top plate region corresponding to the avoiding holes is fixedly sealed with the single battery shell body; The heat exchange device is arranged on the top of the shell, and the heat exchange device cavity serves as an insulation heat transfer medium flow cavity; in the z direction, the polarity terminal penetrates through the heat exchange device, and part of the structure of the polarity terminal is located in the heat exchange device cavity and directly contacts the insulation heat transfer medium; another part of the structure of the polarity terminal is located outside the heat exchange device as an electrical connection part, and the side wall of the polarity terminal is sealed with the heat exchange device; The temperature control system includes a heat transfer unit and a heat treatment unit; the heat transfer unit is used to realize the heat transfer medium transportation between each heat exchange device and the heat treatment unit; the heat treatment unit is used to heat or cool the heat transfer medium transported by the heat transfer unit.

2. The energy storage device of claim 1, wherein: The heat exchange device includes a heat exchange pipe; the heat exchange pipe includes a pipe body, and the pipe body is provided with a first channel and at least one row of second channel units; the first channel extends along the x direction and serves as an insulation heat transfer medium flow cavity; each row of second channel units includes a plurality of second channels arranged along the x direction, and each second channel extends along the z direction and penetrates through the first channel; Each second channel in each row of second channel units corresponds to the polarity terminal located on the same side of the large-capacity battery; Each polarity terminal is inserted into the corresponding second channel, and in the z direction, the electrical connection part of the polarity terminal extends out of the second channel; The first port and the second port of the second channel are sealed with the side wall of the corresponding polarity terminal.

3. The energy storage device of claim 2, wherein: The polarity terminal is provided with a functional structure for increasing the heat exchange area of the polarity terminal; the part of the polarity terminal provided with the functional structure is located in the first channel.

4. The energy storage device of claim 3, wherein: The functional structure is n first annular grooves, and n is an integer greater than or equal to 1; each first annular groove extends along the circumferential direction of the side wall of the polarity terminal, and n first annular grooves are arranged along the height direction of the polarity terminal.

5. The energy storage device of claim 1, wherein: A first insulation sealing glue layer is arranged between each single battery polarity terminal and the corresponding avoiding hole; the shell top plate region corresponding to the avoiding hole is fixedly sealed with the single battery shell body.

6. The energy storage device of claim 5, wherein: The large-capacity battery assembly further includes a second insulation sealing glue layer; the second insulation sealing glue layer is laid on the top of the large-capacity battery and cooperates with the first sealing glue layer to wrap the heat exchange device.

7. The energy storage device of any one of claims 1-6, wherein: In each battery cluster, a plurality of battery packs are arranged along the z direction, and in each battery pack, a plurality of large-capacity battery assemblies are arranged along the y direction; The heat transfer unit includes a liquid supply pipeline assembly, a liquid outlet pipeline assembly, a liquid inlet pipeline assembly, and a liquid return pipeline assembly; The liquid supply pipeline assembly is used to transport the heat transfer medium in the heat treatment unit to each battery cluster, and the liquid outlet pipeline assembly is used to converge the heat transfer medium after heat exchange with each battery cluster to the heat treatment unit; The liquid inlet pipeline assembly and the liquid outlet pipeline assembly correspond to the battery cluster; in each battery cluster, the liquid inlet pipeline assembly is used to divide the heat transfer medium in the liquid supply pipeline assembly into the heat exchange devices of the plurality of large-capacity battery assemblies; and the liquid return pipeline assembly is used to gather the heat transfer medium after heat exchange in the heat exchange devices of the plurality of large-capacity battery assemblies into the liquid outlet pipeline assembly.

8. The energy storage device of claim 7, wherein: Each liquid inlet pipeline assembly comprises a primary liquid inlet pipeline, a plurality of secondary liquid inlet pipelines and a plurality of tertiary liquid inlet pipelines; The liquid inlet of the primary liquid inlet pipeline is used to be connected with the liquid supply pipeline assembly; The secondary liquid inlet pipeline corresponds to the battery pack in the battery cluster corresponding to the liquid inlet pipeline assembly; each secondary liquid inlet pipeline is connected with the primary liquid inlet pipeline to divide the heat transfer medium in the primary liquid inlet pipeline into the corresponding battery pack; The tertiary liquid inlet pipeline corresponds to the large-capacity battery assembly in the battery cluster corresponding to the liquid inlet pipeline assembly; For each battery pack, two ends of each tertiary liquid inlet pipeline are connected with the secondary liquid inlet pipeline and the heat exchange device of the corresponding large-capacity battery assembly, respectively; and each tertiary liquid inlet pipeline divides the heat transfer medium in the secondary liquid inlet pipeline into the heat exchange device of the corresponding large-capacity battery assembly in the battery pack; The liquid return pipeline assembly comprises a primary liquid outlet pipeline, a plurality of secondary liquid outlet pipelines and a plurality of tertiary liquid outlet pipelines; The liquid outlet of the primary liquid outlet pipeline is used to be connected with the liquid outlet pipeline assembly; The secondary liquid outlet pipeline corresponds to the battery pack in the battery cluster; each secondary liquid outlet pipeline is connected with the primary liquid outlet pipeline to gather the heat transfer medium after heat exchange in the battery pack into the primary liquid outlet pipeline; The tertiary liquid outlet pipeline corresponds to the large-capacity battery assembly in the battery cluster; for each battery pack, two ends of each tertiary liquid outlet pipeline are connected with the secondary liquid outlet pipeline corresponding to the battery pack and the heat exchange device of the corresponding large-capacity battery assembly, respectively, to gather the heat transfer medium after heat exchange in the large-capacity battery into the secondary liquid outlet pipeline.

9. The energy storage device of claim 8, wherein: The battery clusters are a plurality of matrix-arranged clusters; The liquid supply pipeline assembly comprises a primary division pipeline, a secondary division pipeline and a tertiary division pipeline; the inlet of the primary division pipeline is used to be connected with the heat treatment unit; the secondary division pipeline is used to divide the heat transfer medium in the primary division pipeline into different column or row battery clusters; and the tertiary division pipeline is used to divide the heat transfer medium in the secondary division pipeline into a plurality of battery clusters in the same column or row; The liquid outlet pipeline assembly comprises a primary combination pipeline, a secondary combination pipeline and a tertiary combination pipeline; the tertiary combination pipeline is used to gather the heat transfer medium of the plurality of battery clusters in the same column or row into the secondary combination pipeline; the secondary combination pipeline is used to gather the heat transfer medium of the different column or row battery clusters into the primary combination pipeline; and the outlet of the primary combination pipeline is used to be connected with the heat treatment unit.

10. The energy storage device of claim 9, wherein: At least part of the pipelines of the liquid supply pipeline assembly, the liquid outlet pipeline assembly, the liquid inlet pipeline assembly and the liquid return pipeline assembly is provided with a heat preservation layer; the secondary liquid inlet pipeline and the secondary liquid outlet pipeline are formed by splicing a plurality of sections of pipelines; the liquid supply pipeline assembly is provided with a water supplement joint; and the liquid outlet pipeline assembly is provided with an exhaust valve.

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