Energy storage equipment

Abstract

The utility model provides energy storage equipment, which mainly solves the problem that the existing battery module has potential safety hazards. The energy storage device comprises a temperature control system and at least one battery cluster. The battery cluster comprises at least one battery module; the battery module comprises a battery pack and a pressure-bearing shell; the battery pack comprises a plurality of single batteries, the plurality of single batteries are arranged in the pressure-bearing shell along the x direction, and polarity terminals of the single batteries extend out of first avoiding holes of a top plate of the pressure-bearing shell and are connected in series through an electric connection assembly; a heat exchange device is arranged at the top of the pressure-bearing shell, and an insulating heat exchange medium in the heat exchange device is in direct contact with the polar terminals of the single batteries for heat exchange; the temperature control system comprises a heat conveying unit and a heat processing unit; the heat conveying unit is used for conveying an insulating heat exchange medium between each battery module heat exchange device and the heat treatment unit; and the heat treatment unit is used for heating or cooling the insulating heat exchange medium conveyed by the heat conveying unit.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery field, and specifically relates to a battery module. BACKGROUND

[0002] The existing energy storage equipment comprises a plurality of battery modules, each battery module is composed of a plurality of single batteries in series, so that the battery module has the characteristics of high integration and high energy density. The battery module has the characteristics of high space utilization, high integration and high energy density. However, due to the high concentration of single batteries in the battery module, a large amount of heat will be generated during charging and discharging, and the heat will gradually increase. If the generated heat is not released in time, the heat will accumulate, causing uneven temperature of the battery module, thereby reducing the service life of the battery module. In severe cases, the thermal balance of the battery module is destroyed, causing safety hazards. SUMMARY

[0003] The utility model provides a kind of energy storage equipment, mainly solve the problem that existing battery module has safety hazard.

[0004] To solve the above problems, the technical scheme provided by the utility model is as follows:

[0005] An energy storage equipment includes a temperature control system and at least one battery cluster. The battery cluster includes at least one battery module. The battery module includes a battery pack and a pressure-containing shell. The battery pack includes a plurality of single batteries arranged in the pressure-containing shell along the x-direction. The pressure-containing shell is a closed pressure shell with a blast venting channel covering the blast venting part of each single battery. The pressure-containing shell top plate has a first avoiding hole corresponding to the polarity terminal of each single battery. After the polarity terminal of each single battery extends out of the first avoiding hole, it is connected in series through an electrical connection assembly. The area of the pressure-containing shell top plate corresponding to the first avoiding hole is fixed and sealed with the single battery shell. The top of the pressure-containing shell is provided with a heat exchange device, which is insulated from the pressure-containing shell and each single battery. The heat exchange device has a heat exchange channel through which an insulating heat exchange medium is in direct contact with the polarity terminal of each single battery for heat exchange. The temperature control system includes a heat transfer unit and a heat treatment unit. The heat transfer unit is used to transfer the insulating heat exchange medium between the heat exchange device of each battery module and the heat treatment unit. The heat treatment unit is used to heat or cool the insulating heat exchange medium transferred by the heat transfer unit.

[0006] Further, the heat exchange device is a hollow box with one open end, and the open end of the hollow box is sealingly fixed to the top plate of the pressure-bearing shell, so that the cavity formed by the hollow box and the top plate of the pressure-bearing shell is used as a heat exchange channel; the hollow box is provided with a second avoiding hole corresponding to each polarity terminal of the single battery, and each polarity terminal of the single battery extends out of the corresponding second avoiding hole, and the polarity terminal and the second avoiding hole are sealingly connected.

[0007] Further, the heat exchange device comprises a connecting pipe assembly, each polarity terminal of the single battery is provided with a channel penetrating through the polarity terminal, and the connecting pipe assembly connects the channels on the polarity terminals of the adjacent single batteries to form a heat exchange channel, and the connecting pipe assembly is insulated from each polarity terminal of the single battery.

[0008] Further, the heat exchange device comprises at least one heat exchange plate, the heat exchange plate has a first channel extending in the x direction and at least one group of second channels arranged in the x direction, the first channel of the heat exchange plate is used as a heat exchange channel, and each second channel penetrates in the z direction and is connected to the first channel; the polarity terminal of each single battery is electrically connected to the electrical connection assembly after penetrating through the second channel in the z direction, and part of the structure of each polarity terminal of the single battery is located in the heat exchange channel and directly contacts with the insulating heat exchange medium.

[0009] Further, the pressure-bearing shell comprises a cylinder with at least one open end at the top or bottom, a top plate sealing the open end of the top of the cylinder, and a bottom plate sealing the open end of the bottom of the cylinder, and the top plate is provided with a protrusion extending in the x direction, and a blast vent channel is formed in the protrusion.

[0010] Further, an insulating sealing adhesive layer is arranged above the pressure-bearing shell, and the main part of the heat exchange device is located in the insulating sealing adhesive layer, the adapter pipe connected to the liquid inlet end and the liquid outlet end of the heat exchange device extends out of the insulating sealing adhesive layer, the top of the pressure-bearing shell is provided with an insulating protective cover, and each polarity terminal of the single battery and the heat exchange device are located in the insulating protective cover.

[0011] Further, the battery cluster comprises a plurality of battery module units arranged in the vertical direction, each battery module unit comprises a plurality of battery modules arranged in the horizontal direction; the heat transfer unit comprises a liquid supply pipe assembly, a liquid outlet pipe assembly, a liquid inlet pipe assembly and a liquid return pipe assembly; the liquid supply pipe assembly is used for conveying the insulating heat exchange medium in the heat treatment unit to each battery cluster, and the liquid outlet pipe assembly is used for converging the insulating heat exchange medium after heat exchange with each battery cluster to the heat treatment unit; the number of the liquid inlet pipe assembly and the liquid return pipe assembly corresponds to the number of the battery cluster; in each battery cluster, the liquid inlet pipe assembly is used for dividing the insulating heat exchange medium in the liquid supply pipe assembly to the heat exchange devices of the plurality of battery modules; and the liquid return pipe assembly is used for converging the insulating heat exchange medium after heat exchange of the plurality of battery modules to the liquid outlet pipe assembly.

[0012] Further, the liquid inlet pipeline assembly comprises a first liquid inlet pipeline, a second liquid inlet pipeline and a third liquid inlet pipeline; the liquid inlet port of the first liquid inlet pipeline is used for connecting with the liquid supply pipeline assembly; the second liquid inlet pipelines are connected with the first liquid inlet pipeline, and the second liquid inlet pipelines divide the insulation heat exchange medium in the first liquid inlet pipeline into the plurality of battery module units; the third liquid inlet pipelines are connected with the second liquid inlet pipelines, and the third liquid inlet pipelines divide the insulation heat exchange medium in the second liquid inlet pipelines into the heat exchange devices of the plurality of battery modules; the liquid return pipeline assembly comprises a first liquid outlet pipeline, a second liquid outlet pipeline and a third liquid outlet pipeline; the third liquid outlet pipelines are connected with the second liquid outlet pipelines, and are used for converging the insulation heat exchange medium after heat exchange with the battery modules into the second liquid outlet pipelines; the second liquid outlet pipelines are connected with the first liquid outlet pipeline, and the second liquid outlet pipelines converge the insulation heat exchange medium after heat exchange with the plurality of battery module units into the first liquid outlet pipeline; and the first liquid outlet pipeline is connected with the liquid outlet pipeline assembly.

[0013] Further, the battery clusters are a plurality of and arranged in a matrix form; the liquid supply pipeline assembly comprises a first liquid distribution pipeline, a second liquid distribution pipeline and a third liquid distribution pipeline; the inlet of the first liquid distribution pipeline is used for connecting with the heat treatment unit; the second liquid distribution pipeline is used for dividing the insulation heat exchange medium in the first liquid distribution pipeline into different column or different row battery clusters; the third liquid distribution pipeline is used for dividing the insulation heat exchange medium in the second liquid distribution pipeline into a plurality of battery clusters in the same column or the same row; the liquid outlet pipeline assembly comprises a first liquid convergence pipeline, a second liquid convergence pipeline and a third liquid convergence pipeline; the third liquid convergence pipeline is used for converging the insulation heat exchange medium of the plurality of battery clusters in the same column or the same row into the second liquid convergence pipeline; the second liquid convergence pipeline is used for converging the insulation heat exchange medium of the different column or different row battery clusters into the first liquid convergence pipeline; and the outlet of the first liquid convergence pipeline is used for connecting with the heat treatment unit.

[0014] 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 is provided with a heat preservation layer; the second liquid outlet pipeline is connected with the first liquid outlet pipeline by using a quick connector and a hose, and meanwhile, in the same row of battery clusters, adjacent two battery clusters share one first liquid outlet pipeline; meanwhile, the second liquid inlet pipeline and the second liquid outlet pipeline are spliced by using a plurality of pipeline segments.

[0015] Further, the first liquid distribution pipeline is provided with a water supplement connector for supplementing the insulation heat exchange medium for the temperature control system, and the first liquid convergence pipeline is provided with an exhaust valve.

[0016] Further, the heat treatment unit comprises a temperature control machine; the liquid inlet port of the temperature control machine is connected with the liquid outlet pipeline assembly, the liquid outlet port of the temperature control machine is connected with the liquid supply pipeline assembly, the temperature control machine is used for heating or cooling the insulation heat exchange medium, and the liquid inlet port and the liquid outlet port of the temperature control machine are provided with a blocking connector which can block the insulation heat exchange medium in the temperature control machine.

[0017] Further, the heat treatment unit further comprises a radiator and a control valve; the control valve is used for controlling whether the insulation heat exchange medium enters the radiator; the inlet and outlet of the radiator are connected with the liquid outlet pipeline assembly, and the insulation heat exchange medium is radiated.

[0018] Compared with the prior art, the beneficial effects of the technical scheme of the utility model are:

[0019] 1. The energy storage equipment sets a heat exchange device, a pressure-bearing shell and a temperature control system for the battery module. When the battery module is working normally, the heat exchange device and the temperature control system control the temperature of the battery module, avoid safety hazards of the battery module, and improve the safety of the battery module in use. When the battery module is in thermal runaway, the pressure-bearing shell with the explosion venting channel and the pressure-bearing capacity can collect the high-temperature and high-pressure thermal runaway flue gas and electrolyte generated by the single battery in the pressure-bearing shell, avoid the harm of the high-temperature and high-pressure thermal runaway flue gas to the surrounding devices after leakage, and improve the safety of the battery module.

[0020] The heat exchange device is provided with a heat exchange channel through which the insulation heat exchange medium passes, and the heat exchange channel mainly exchanges heat with the polarity terminals of the single battery with relatively concentrated heat, so as to realize reliable temperature control of each single battery in the battery pack. The heat exchange device adopts a direct heat exchange mode, directly contacts the insulation heat exchange medium in the heat exchange channel with the polarity terminals of the single battery, and directly acts on the polarity terminals by the insulation heat exchange medium, so that the insulation heat exchange medium has a shorter heat exchange path, and the utilization efficiency of the insulation heat exchange medium is improved, the heat exchange efficiency of the battery module is improved, the temperature control effect of the battery module is improved, and the safety of the battery module in use is improved. Under the joint action of the heat exchange device, the temperature control system and the pressure-bearing shell, the safety hazards caused by the thermal runaway of the battery module are avoided, and the safety of the energy storage equipment is improved.

[0021] 2. In the energy storage equipment, the heat exchange device is a hollow box body with one end open, and the insulation heat exchange medium in the heat exchange channel formed by the hollow box body not only directly exchanges heat with the polarity terminals of each single battery, but also directly exchanges heat with the top plate of the pressure-bearing shell, further improving the heat exchange effect of the insulation heat exchange medium on the battery module.

[0022] 3. In the energy storage equipment, the heat exchange device comprises at least one heat exchange plate, and the heat exchange plate exchanges heat with the polarity terminals of all single batteries in the battery pack. The heat exchange device adopts an integrated structure, and has better overall sealing property compared with the structure of setting a sub heat exchange device on each single battery, and is also convenient to process and manufacture.

[0023] 4. The utility model discloses a pressure bearing shell includes the cylinder structure of top or bottom at least one end open and the top plate of sealing cylinder top open end, the bottom plate of sealing cylinder bottom open, the pressure bearing shell of this kind of structure, the height of cylinder is almost the same with the shell height of single battery, makes the volume and the manufacturing cost of whole battery module are smaller.

[0024] In addition, the polar terminal of each single battery is formed after passing through the top plate of the pressure bearing shell, and the heat exchange channel is formed outside the pressure bearing shell, and the electrical connection of each single battery is carried out outside the pressure bearing shell. This way facilitates the assembly of the heat exchange device and the connection of the electrical connection assembly, and the single battery in the pressure bearing shell is not easy to affect the external electrical connection assembly and the heat exchange channel when it is in thermal runaway.

[0025] 5. The utility model discloses a pressure bearing shell top plate upper is equipped with insulating sealing adhesive layer, and the main part of heat exchange device is all located in insulating sealing adhesive layer, and insulating sealing adhesive layer can avoid the short circuit problem caused by the condensation outside heat exchange device, and further improve the sealing property of whole heat exchange device. In addition, the battery module uses the insulating protective cover to provide insulating protection for the polar terminal and the heat exchange device, avoids the security risk that may exist in the exposed polar terminal during the operation of the battery module, and also avoids the problem that some foreign matters in the external environment fall into the polar terminal position and cause the short circuit of the battery module, and improves the safety of the battery module.

[0026] 6. The utility model discloses a pressure bearing shell top plate upper is equipped with insulating sealing adhesive layer, and the main part of heat exchange device is all located in insulating sealing adhesive layer, and insulating sealing adhesive layer can avoid the short circuit problem caused by the condensation outside heat exchange device, and further improve the sealing property of whole heat exchange device. In addition, the battery module uses the insulating protective cover to provide insulating protection for the polar terminal and the heat exchange device, avoids the security risk that may exist in the exposed polar terminal during the operation of the battery module, and also avoids the problem that some foreign matters in the external environment fall into the polar terminal position and cause the short circuit of the battery module, and improves the safety of the battery module.

[0027] 7. The utility model discloses a pressure bearing shell top plate upper is equipped with insulating sealing adhesive layer, and the main part of heat exchange device is all located in insulating sealing adhesive layer, and insulating sealing adhesive layer can avoid the short circuit problem caused by the condensation outside heat exchange device, and further improve the sealing property of whole heat exchange device. In addition, the battery module uses the insulating protective cover to provide insulating protection for the polar terminal and the heat exchange device, avoids the security risk that may exist in the exposed polar terminal during the operation of the battery module, and also avoids the problem that some foreign matters in the external environment fall into the polar terminal position and cause the short circuit of the battery module, and improves the safety of the battery module.

[0028] 8. The energy storage device of the utility model, the at least part pipeline of liquid supply pipeline assembly, liquid outlet pipeline assembly, liquid inlet pipeline assembly, liquid return pipeline assembly is equipped with the heat preservation layer, the heat preservation layer can effectively prevent the cold quantity or heat loss of the insulation heat exchange medium, reduces the energy consumption, can also avoid the condensation phenomenon on the pipe wall of each pipeline. Meanwhile, the two-stage liquid inlet pipe and the two-stage liquid outlet pipe are spliced by multiple sections of pipeline, and the spliced pipeline reduces the error and assembly difficulty when the two-stage liquid inlet pipe and the two-stage liquid outlet pipe are connected. Meanwhile, the spliced pipeline only needs to remove the pipeline connector of the related battery module for maintenance, without removing the entire temperature control pipeline assembly, and the installation and maintenance are very convenient.

[0029] 9. The energy storage device of the utility model, the first-stage shunt pipe is provided with a water replenishing joint for replenishing the insulation heat exchange medium for the temperature control system, and the first-stage flow pipe is provided with an exhaust valve for exhausting air in the temperature control system. The water replenishing joint and the exhaust valve work in cooperation to enable the temperature control system to efficiently control the temperature of each battery module and improve the temperature control effect of the temperature control system.

[0030] 10. The energy storage device of the utility model, in the same row of battery clusters, the first-stage liquid outlet pipe of adjacent battery clusters is a pipeline, and such a configuration can reduce the number of pipelines and facilitate pipeline arrangement. Meanwhile, the two-stage liquid outlet pipe is connected to the first-stage liquid outlet pipe by using a quick plug connector and a hose, which reduces the installation error when the pipelines are connected, reduces the installation requirements on site, and further increases the installation convenience of the pipelines.

[0031] 11. The energy storage device of the utility model, the heat treatment unit controls the temperature of the battery module by the combination of the temperature control machine and the radiator. In the case of non-extreme temperature, the radiator uses the ambient temperature to cool the battery module, and in the case of extreme temperature, the temperature control machine is started to heat or cool when the temperature is too high or too low. This can maximize the use of ambient temperature and reduce the temperature control energy consumption.

[0032] 12. The energy storage device of the utility model, the liquid inlet and the liquid outlet of the temperature control machine are provided with a blocking joint, which can prevent the insulation heat exchange medium in the temperature control machine from flowing out during maintenance of the temperature control machine, without the need for corresponding liquid discharge operation, thereby improving the convenience and reliability during maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structural schematic view of the energy storage device in Example 1.

[0034] Figure 2 It is a schematic view of the battery module in Example 1.

[0035] Figure 3 It is an explosion of the battery module in Example 1. Figure 1 ;

[0036] Figure 4 Exploded view of the battery module of Example 1 Figure 2 ;

[0037] Figure 5 Exploded view of the heat exchanger of Example 1

[0038] Figure 6 Cross-sectional view of the battery module of Example 1 Figure 1 ;

[0039] Figure 7 Cross-sectional view of the battery module of Example 1 Figure 2 ;

[0040] Figure 8 Structure diagram of the single cell of Example 1

[0041] Figure 9 Diagram of the multiple battery clusters and temperature control system of Example 1

[0042] Figure 10 Structure diagram of the heat delivery unit and heat treatment unit of Example 1

[0043] Figure 11 Diagram of the liquid inlet pipeline assembly and liquid return pipeline assembly of Example 1

[0044] Figure 12 Diagram of the battery module and heat delivery unit of Example 1

[0045] Figure 13 Diagram of the liquid supply pipeline assembly and liquid outlet pipeline assembly of Example 1

[0046] Figure 14 Structure diagram of the blocking joint of Example 1

[0047] Figure 15 Structure diagram of the battery module of Example 2

[0048] Figure 16 Exploded view of the battery module of Example 2

[0049] Figure 17 Cross-sectional view of the battery module of Example 2

[0050] Figure 18 Structure diagram of the battery module of Example 3 Figure 1 ;

[0051] Figure 19 Structure diagram of the heat exchange plate of Example 3 Figure 1 ;

[0052] Figure 20Structure diagram of the battery module in Example 3 Figure 2 ;

[0053] Figure 21 Structure diagram of the heat exchange plate in Example 3 Figure 2 ;

[0054] Figure 22 Cross-sectional view of the battery module in Example 3

[0055] Figure 23 Structure diagram of the battery module in Example 4

[0056] Figure 24 Structure diagram of the single cell polarity terminal provided with a channel in Example 4

[0057] Figure 25 Exploded view of the battery module in Example 4

[0058] Figure 26 Cross-sectional view of the battery module in Example 4

[0059] Figure 27 Schematic diagram of the heat treatment unit in Example 5

[0060] Figure 28 Schematic diagram of the insulation heat exchange medium flow in Example 5 Figure 1 ;

[0061] Figure 29 Schematic diagram of the insulation heat exchange medium flow in Example 5 Figure 2 .

[0062] Reference signs: 1-battery module, 2-temperature control system, 3-heat delivery unit, 4-heat treatment unit, 11-battery pack, 12-pressure shell, 13-electric connection assembly, 14-adaptor pipe, 15-sealing connector, 16-supporting member, 17-insulation shield, 111-single battery, 112-sub connection pipe, 113-heat exchange pipe fitting, 114-heat exchange plate, 115-first channel, 116-second channel, 117-hollow box, 118-O-shaped sealing ring, 119-explosion venting part, 1110-intermediate pipe section, 1111-polarity terminal, 1112-channel, 1113-fixing part, 1114-heat conduction rib plate, 1115-function structure, 121-cylinder, 122-end plate, 123-explosion venting channel, 124-explosion venting mechanism, 1211-first avoiding hole, 1221-first sealing plate, 1222-second sealing plate, 131-first electric connector, 132-second electric connector, 1171-sealing top plate, 1172-second side plate, 1173-first side plate, 1174-second avoiding hole, 31-liquid inlet pipeline assembly, 32-liquid return pipeline assembly, 33-liquid supply pipeline assembly, 34-liquid outlet pipeline assembly, 35-hose, 36-quick connector, 311-first-stage liquid inlet pipe, 312-second-stage liquid inlet pipe, 313-third-stage liquid inlet pipe, 321-first-stage liquid outlet pipe, 322-second-stage liquid outlet pipe, 323-third-stage liquid outlet pipe, 331-first-stage shunt pipe, 332-second-stage shunt pipe, 333-third-stage shunt pipe, 341-first-stage flow pipe, 342-second-stage flow pipe, 343-third-stage flow pipe, 41-temperature control machine, 42-radiator, 43-control valve, 44-block joint, 441-joint end pipe, 442-regulating valve, 443-welding chuck. DETAILED DESCRIPTION

[0063] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a 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 work should belong to the protection scope of the present application.

[0064] 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 without departing from the spirit and scope of the present application, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0065] In the description of the utility model, it is necessary to explain that the position relation or the position relation indicated in the term "top, bottom" is based on the position relation or the position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or the element indicated must have a particular orientation, a particular orientation and operation, therefore it cannot be understood as the limitation of the utility model. In addition, the term "first, second, third" is only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0066] The utility model provides a kind of energy storage equipment, which comprises at least one battery module, and the utility model is configured with heat exchange device, pressure-containing shell and temperature control system for each battery module.When the battery module is working normally, the heat exchange device and the temperature control system control the temperature of the battery module, avoid the safety hazard of the battery module, and improve the safety of the battery module in use.The heat exchange device is provided with a heat exchange channel through which the insulating heat exchange medium passes.The heat exchange channel mainly exchanges heat with the polarity terminal where the heat of each single battery is more concentrated, i.e., part of the structure of the polarity terminal is directly placed in the heat exchange device, so that the polarity terminal is directly in contact with the insulating heat exchange medium.Compared with the indirect heat exchange mode, this direct heat exchange mode has a shorter heat exchange path, and the insulating heat exchange medium directly acts on the polarity terminal of each single battery, improving the utilization efficiency of the insulating heat exchange medium, improving the heat exchange efficiency of the battery pack, effectively controlling the temperature of the battery module, avoiding performance problems and safety problems caused by excessively high or low temperature of the battery module, and reducing the probability of thermal runaway of the battery module.

[0067] To reduce the harm of battery module thermal runaway, a pressure-containing shell capable of withstanding pressure is added outside each single battery.The pressure-containing shell has a pressure relief channel and a certain pressure-bearing capacity, and can collect the high-temperature and high-pressure thermal runaway flue gas and electrolyte sprayed by the single battery when the single battery experiences thermal runaway, avoiding the harm caused by the leakage of high-temperature and high-pressure thermal runaway flue gas to the surrounding devices.Under the joint action of the heat exchange device, the pressure-containing shell and the temperature control system, the energy storage equipment has higher safety performance.

[0068] Example 1

[0069] As Figure 1 and Figure 9As shown, the energy storage device provided by the embodiment includes a temperature control system 2 and at least one battery cluster, each battery cluster including at least one battery module 1; the number of battery modules 1 in the battery cluster is set according to the requirements of the energy storage device, and a plurality of battery modules 1 are connected in series and parallel to meet the charging and discharging requirements. In order to improve the energy density, the above-mentioned battery module 1 can be arranged in the following way: a plurality of battery modules 1 are arranged in the horizontal direction in sequence to form a battery module unit, and then a plurality of battery module units are arranged in the vertical direction in sequence to form a battery cluster. If the energy storage device includes a plurality of battery clusters, the plurality of battery clusters can be arranged in a matrix. The temperature control system 2 includes a heat transfer unit 3 and a heat treatment unit 4; the heat transfer unit 3 is used to realize the delivery of the insulating heat transfer medium between the heat exchange device of each battery module and the heat treatment unit 4; the heat treatment unit 4 is used to heat or cool the insulating heat transfer medium delivered by the heat transfer unit.

[0070] As shown, Figures 2 to 4 The battery module 1 in the embodiment includes a battery pack 11 and a pressure-bearing shell 12; the battery pack 11 includes a plurality of single batteries 111, and the number of single batteries 111 can be adjusted according to actual requirements; the pressure-bearing shell 12 is a closed pressure shell, and a plurality of single batteries 111 are arranged in the same direction in the pressure-bearing shell and insulated from the pressure-bearing shell 12. The insulation method can specifically be to set an insulation layer on the inner wall of the pressure-bearing shell 12, or to increase an insulation layer on the shell of each single battery 111, or to increase an insulation pad between the single battery 111 and the pressure-bearing shell 12. At the same time, the pressure-bearing shell 12 has a venting channel 123, and the venting channel 123 covers the venting part 119 of each single battery, which can be a venting film arranged on the shell of each single battery 111.

[0071] The top plate of the above-mentioned pressure-bearing shell 12 is provided with a first avoiding hole 1211 through which the polarity terminal 1111 of each single battery 111 extends, and after a plurality of single batteries 111 are arranged in the same direction in the pressure-bearing shell 12, the polarity terminal 1111 of each single battery 111 extends out of the corresponding first avoiding hole 1211 and realizes series connection through the electric connection assembly 13; at the same time, a sealing connecting piece 15 is additionally arranged between the polarity terminal 1111 of each single battery 111 and the first avoiding hole 1211 to realize the fixed sealing of the region of the cylinder top plate corresponding to the first avoiding hole 1211 and the shell of the single battery 111.

[0072] As shown, Figure 5 , Figure 6 and Figure 7As shown, the sealing connector 15 comprises a hollow member, the bottom of which is used for sealing connection with the first area of the single battery 111, and the top of which is sealingly connected with the second area of the top plate of the pressure-bearing shell 12; wherein the first area is the area around the peripheral edge of the polar terminal 1111 on the cover plate of the single battery 111; wherein the area around the peripheral edge of the polar terminal 1111 is the area around the peripheral edge of the insulating sealing gasket on the polar terminal 1111. The insulating sealing gasket is a part for insulating the polar terminal 1111 and the cover plate of the single battery 111. The second area is the area of the top plate of the pressure-bearing shell 12 corresponding to any one of the first relief holes 1211 of the top plate of the pressure-bearing shell 12. The top plate area of the pressure-bearing shell 12 corresponding to the first relief hole 1211 is the peripheral area of the top plate outer surface of the pressure-bearing shell 12 corresponding to any one of the first relief holes 1211; or the top plate area of the pressure-bearing shell 12 corresponding to the first relief hole 1211 is the hole wall of the first relief hole 1211.

[0073] For the convenience of description, the arrangement direction of the single battery 111 is defined as the x direction, the height direction of the single battery 111 is defined as the z direction, and the direction perpendicular to the x direction and the z direction is defined as the y direction.

[0074] The pressure-bearing shell 12 in the embodiment is a closed pressure shell, which mainly integrates and installs the battery pack 11 and also protects the safety of the battery pack 11. Unlike the general shell of the battery pack 11, the pressure-bearing shell 12 in the utility model is a closed pressure shell, which can bear a certain pressure, and when each single battery 111 is in thermal runaway, the pressure-bearing shell 12 can ensure that the thermal runaway flue gas does not leak from the pressure-bearing shell 12, thereby avoiding harm to the devices near the battery module 1. Meanwhile, the pressure-bearing shell 12 is provided with a pressure relief passage 123 and a pressure relief mechanism 124, the pressure relief mechanism 124 is in communication with the pressure relief passage 123, and the pressure relief mechanism 124 can orderly discharge the thermal runaway flue gas discharged from each single battery 111.

[0075] The shape and size of the pressure-bearing shell 12 can be designed to be convenient to place according to the application scenario of the battery module 1. In the embodiment, the pressure-bearing shell 12 is a rectangular shell, which can adopt the following structure:

[0076] First, as Figure 2 and Figure 3As shown, the pressure-containing shell 12 includes a cylinder 121 with two open ends and two end plates 122 sealingly arranged at the open ends of the cylinder 121. The front and rear of the cylinder 121 are both open, and one of the end plates 122 is sealingly fixed to the open end of the front of the cylinder 121, and the other end plate 122 is sealingly fixed to the open end of the rear of the cylinder 121. The sealing fixation can be welding or threaded connection, etc. The pressure-containing shell 12 has good pressure-containing performance, and the cylinder 121 can be integrally formed by extrusion process, so that the cylinder 121 has good pressure-containing performance.

[0077] As shown in the figure, Figure 3 Based on the structure of the pressure-containing shell 12, when each monomer battery 111 is installed, each monomer battery 111 is pushed into the cylinder 121 from the open end of the cylinder 121, and then each monomer battery 111 is lifted to make the polarity terminal 1111 of each monomer battery 111 pass through the first avoiding hole 1211 of the top plate of the cylinder 121, and then the support 16 extending along the x direction can be inserted between the bottom plate of the cylinder 121 and each monomer battery 111, and the support 16 supports each monomer battery 111 in the z direction. From the installation process, it can be seen that since each monomer battery 111 is placed in the cylinder 121 from the open end of the side of the cylinder 121, and then the polarity terminal 1111 of each monomer battery 111 is extended from the first avoiding hole 1211 on the top plate of the cylinder 121, the height between the bottom plate of the cylinder 121 and the top plate of the cylinder 121 needs to be greater than the height between the polarity terminal 1111 of each monomer battery 111 and the bottom of the monomer battery 111, in order to realize the installation of each monomer battery 111.

[0078] After the support 16 lifts and supports each monomer battery 111, a cavity is formed between each monomer battery 111 and the bottom plate of the cylinder 121, which can be used as a venting channel 123. The venting channel 123 covers the venting part 119 at the bottom of each monomer battery 111, and when the venting part 119 of any monomer battery 111 is broken by the hot smoke in the cavity, the hot smoke is discharged through the venting channel 123.

[0079] From the above description, it can be seen that the venting channel 123 arranged between the bottom plate of the cylinder 121 and the monomer battery 111 is a preferred scheme.

[0080] The end plate 122 is mainly used to seal the open end of the cylinder 121, and the end plate 122 is provided with a venting mechanism 124, and the thermal runaway flue gas in the pressure-containing shell 12 is discharged out of the pressure-containing shell 12 through the venting mechanism 124. The end plate 122 in the embodiment includes a first sealing plate 1221 and a second sealing plate 1222 arranged in parallel. The first sealing plate 1221 is used to seal the open end of the cylinder 121, and the first sealing plate 1221 is provided with a venting mechanism 124. The size of the second sealing plate 1222 in the x direction is adjusted so that the end plate 122 clamps all the single batteries 111 in the x direction, prevents the bulging of each single battery 111, and improves the stability of each single battery 111 in the pressure-containing shell 12.

[0081] In other embodiments, the end plate 122 can also adopt a structure of one sealing plate. The pressure-containing performance of the end plate 122 with this structure is relatively weak compared with the end plate 122 with the above-mentioned double-sealing plate structure.

[0082] Second, as shown in Figure 4 The pressure-containing shell 12 includes a cylinder, a top plate and a bottom plate. At least one end of the top or bottom of the cylinder is open. The top plate is sealingly fixed to the open end of the top of the cylinder 121, and the bottom plate is sealingly fixed to the open end of the bottom of the cylinder 121. The sealing fixation can be welding or threaded connection, etc. In some embodiments, the bottom plate and the cylinder 121 are an integral structure, or the top plate and the cylinder 121 are an integral structure. The pressure-containing shell 12 with this structure has better pressure resistance and sealing performance.

[0083] The installation process of each single battery 111 is described with the top plate and the cylinder 121 being an integral structure and the bottom plate and the cylinder 121 being a separate structure. When installing each single battery 111, each single battery is placed into the cylinder from the open end of the bottom of the cylinder 121, so that the polar terminal 1111 of each single battery 111 passes through the first avoiding hole 1211 of the top plate, and then the bottom plate is fixedly connected with the cylinder 121. This installation method makes the height of the cylinder 121 only slightly larger than the height of the shell of each single battery 111, that is, the height of the cylinder 121 only needs to consider the size of the shell of each single battery 111, without considering the size of the polar terminal of each single battery 111. Compared with the structure in which the cylinder is open from the side end, the structure in which the cylinder is open from the top or bottom makes the height of the entire cylinder 121 relatively small, thereby reducing the height of the entire battery module 1 in the z direction, and the volume and manufacturing cost of the battery module 1 are also reduced. At the same time, the pressure-containing shell 12 structure installed from the top or bottom does not need to be provided with a support in the cylinder 121, and the manufacturing cost of the entire battery module 1 is further reduced.

[0084] The pressure-bearing shell 12 has a venting passage 123 in the top or bottom, which covers the venting part 119 of each single battery. In specific settings, the venting passage 123 can be arranged at the top of the inner cavity of the pressure-bearing shell 12, or at the bottom of the inner cavity of the pressure-bearing shell 12. When the venting passage 123 is arranged at the top of the inner cavity of the pressure-bearing shell 12, a protrusion extending in the x direction can be arranged on the top plate of the pressure-bearing shell 12, and the venting passage 123 is formed in the protrusion. Alternatively, the top plate of the pressure-bearing shell 12 is a flat structure, and the venting passage 123 is formed between the top of the single battery 111 and the top plate. In this case, a certain space is required between the top of the single battery 111 and the top plate, and in actual installation, the polarity terminal 1111 of each single battery 111 needs to be increased in height to meet the requirements of contact between the polarity terminal 1111 and the heat exchange passage, and electrical connection with the electrical connection assembly 13. After the polarity terminal 1111 of the single battery 111 is increased in height, the height of the sealing connector 15 and the cylinder 121 is further increased, thereby increasing the height of the entire battery module 1 in the z direction, and further increasing the volume and manufacturing cost of the entire battery module 1.

[0085] When the venting passage 123 is arranged at the bottom of the inner cavity of the pressure-bearing shell 12, a protrusion extending in the x direction can also be arranged on the bottom plate of the pressure-bearing shell 12, and the venting passage 123 is formed in the protrusion. Alternatively, a support extending in the x direction is inserted between the bottom plate of the pressure-bearing shell 12 and each single battery 111, and after the support lifts and supports each single battery 111 in the z direction, the passage between the support and the bottom of each single battery is the venting passage. However, this venting passage also increases the overall height of the pressure-bearing shell 12 in the z direction.

[0086] Therefore, arranging a protrusion on the top plate of the pressure-bearing shell 12 and forming the venting passage 123 in the protrusion is a relatively preferred way. This structure of the venting passage does not increase the overall height of the pressure-bearing shell 12, and the cylinder 121 does not need to be provided with a support, and the manufacturing cost of the entire battery module 1 is relatively small.

[0087] As shown in FIG. 1, in order to further improve the safety of the battery module 1 in use, the pressure-bearing shell 12 of the battery module 1 is provided with a venting mechanism 124 communicating with the venting passage, and the thermal runaway smoke in the venting passage 123 is discharged out of the pressure-bearing shell 12 through the venting mechanism 124. The venting mechanism 124 specifically includes a pressure relief pipe and a pressure relief part, the pressure relief pipe is connected with the venting port of the pressure-bearing shell 12, and the pressure relief part is arranged on the pressure relief pipe or the venting port of the pressure-bearing shell 12. The pressure relief part can be a venting membrane or a venting valve. The venting mechanism 124 can ensure that the thermal runaway smoke in the battery module 1 can be smoothly discharged when the battery module 1 occurs thermal runaway, and avoid safety hazards such as explosion in the pressure-bearing shell 12 of the battery module 1. Figure 2 As shown in FIG. 1, in order to further improve the safety of the battery module 1 in use, the pressure-bearing shell 12 of the battery module 1 is provided with a venting mechanism 124 communicating with the venting passage, and the thermal runaway smoke in the venting passage 123 is discharged out of the pressure-bearing shell 12 through the venting mechanism 124. The venting mechanism 124 specifically includes a pressure relief pipe and a pressure relief part, the pressure relief pipe is connected with the venting port of the pressure-bearing shell 12, and the pressure relief part is arranged on the pressure relief pipe or the venting port of the pressure-bearing shell 12. The pressure relief part can be a venting membrane or a venting valve. The venting mechanism 124 can ensure that the thermal runaway smoke in the battery module 1 can be smoothly discharged when the battery module 1 occurs thermal runaway, and avoid safety hazards such as explosion in the pressure-bearing shell 12 of the battery module 1.

[0088] To improve the heat exchange efficiency of the battery module 1, a heat exchange device is installed on the top of the pressure-bearing shell 12. The heat exchange device is insulated from the pressure-bearing shell and each single battery cell. The heat exchange device includes a heat exchange channel through which an insulating heat exchange medium passes. The insulating heat exchange medium in this heat exchange channel directly contacts the polarity terminals 1111 of each single battery cell 111 for heat exchange. This heat exchange channel uses a direct heat exchange method, allowing the polarity terminals 1111 to directly contact the insulating heat exchange medium, achieving heat exchange at the polarity terminals 1111. Compared to the effect of the insulating heat exchange medium indirectly exchanging heat with the polarity terminals 1111 through a heat exchange component, this heat exchange channel firstly has a shorter heat exchange path, which can improve the utilization efficiency of the insulating heat exchange medium; secondly, it has a larger heat exchange area, which improves the heat exchange efficiency, thereby further improving the heat exchange efficiency of this type of battery module 1.

[0089] An insulating heat exchange medium is introduced into the heat exchange channel, directly contacting the polarity terminals 1111, to achieve temperature control of the battery pack 11. When the temperature of the battery pack 11 exceeds a set threshold, a lower-temperature insulating heat exchange medium is introduced into the heat exchange channel to cool the battery pack 11. When the temperature of the battery pack 11 falls below the set threshold, a higher-temperature insulating heat exchange medium is introduced into the heat exchange channel to raise the temperature of the battery pack 11. By controlling the temperature of the insulating heat exchange medium, the battery pack 11 is ensured to always operate at its normal operating temperature.

[0090] The heat exchange device and heat exchange channel in this embodiment are realized by the following structure:

[0091] like Figure 5 As shown, the heat exchange device includes multiple sub-heat exchange devices, each corresponding to a single cell 111. Each sub-heat exchange device includes at least one heat exchange tube 113, each having a first channel extending along the x-direction and at least one second channel. The polarity terminals 1111 of each single cell 111 pass through the first avoidance holes 1211 on the top plate of the cylinder 121, then pass through the corresponding heat exchange tubes 113 in the z-direction to achieve electrical connection with the electrical connection assembly, connecting the first channels of the heat exchange tubes of adjacent single cells to form a heat exchange channel. Part of the structure of each single cell polarity terminal is located within the heat exchange channel, in direct contact with the insulating heat exchange medium. Each heat exchange tube is insulated from the adjacent single cells 111.

[0092] The sub-heat exchange device in this embodiment is described in detail below with reference to the accompanying drawings.

[0093] a. Figure 5 and Figure 6As shown, the sub-heat exchange device includes two heat exchange tubes 113 arranged along the y direction. Each heat exchange tube 113 is provided with a first channel 115 and a second channel 116. The first channel 115 extends along the x direction. The second channel 116 extends along the z direction and is connected to the first channel 115. The two polarity terminals 1111 of each single battery 111 pass through the second channels 116 on the two heat exchange tubes 113 respectively, and are electrically connected to the electrical connection assembly 13. The two ends of the second channel 116 are sealed from the polarity terminals 1111.

[0094] b. The sub-heat exchange device includes a heat exchange tube 113. Each heat exchange tube 113 is provided with a first channel 115 and two second channels 116 arranged along the y direction. The first channel 115 extends along the x direction; the second channel 116 extends along the z direction and is connected to the first channel 115. The two polarity terminals 1111 of each single battery 111 pass through the two second channels 116 on the heat exchange tube 113 to achieve electrical connection with the electrical connection assembly 13. The two ends of the second channel 116 are sealed from the polarity terminals 1111.

[0095] c. Figure 7 As shown, the sub-heat exchange device includes two heat exchange pipes 113 arranged along the y direction. The heat exchange pipes 113 are half-tubes. The half-tubes herein can be understood as being divided into two halves along the axial direction of the entire pipe, with each half being a half-tube. The half-tubes are buckled and sealed and fixed to the top plate of the cylinder 121. Each heat exchange pipe 113 is provided with a first channel 115 and a second channel 116. The first channel 115 passes through the x direction; the second channel 116 passes through the z direction and is connected to the first channel 115. The two polarity terminals 1111 of each single battery 111 pass through the second channels 116 on the two heat exchange pipes 113 respectively, and are electrically connected to the electrical connection assembly 13. A seal is formed between one end of the second channel 116 and the polarity terminal 1111.

[0096] d. The sub-heat exchange device includes a heat exchange pipe 113, which is a half-tube. The half-tube is buckled and sealed on the top plate of the cylinder 121. Each heat exchange pipe 113 is provided with a first channel 115 and two second channels 116 arranged along the y direction; the first channel 115 is connected along the x direction; the second channel 116 is connected along the z direction and connected to the first channel 115; the two polarity terminals 1111 of each single battery 111 pass through the two second channels 116 on the heat exchange pipe 113 respectively, and are electrically connected to the electrical connection assembly 13, and a seal is formed between one end of the second channel 116 and the polarity terminal 1111.

[0097] When the battery pack 11 is installed, the heat exchange pipes 113 on the polarity terminals 1111 of adjacent single batteries 111 are communicated with each other as heat exchange channels, and heat exchange between the single batteries 111 is realized. The cross-sectional shape of the heat exchange pipe 113 is not specifically limited in the utility model. Since the heat exchange pipe 113 in the embodiment is arranged on the top of the planar cylinder, the heat exchange pipe 113 in the embodiment is a rectangular pipe or a rectangular half pipe in view of the structural regularity. In other embodiments, a round pipe or a pipe with other structural forms can also be used.

[0098] The first channel 115 is a channel opened along the length direction of the heat exchange pipe 113. The inner cavity of the first channel 115 is used as a flow cavity of the insulating heat exchange medium. The two end ports of the first channel 115 are used as the inlet end and the outlet end of the heat exchange pipe 113 respectively.

[0099] The second channel 116 is used for the partial structure of the polarity terminal 1111 to pass through. In the embodiment, the second channel 116 is perpendicular to the first channel 115. In addition, in the z direction (the height direction of the single battery 111), the size of the second channel 116 is smaller than the size of the corresponding polarity terminal 1111, so that the top of the polarity terminal 1111 as the electrical connection part can extend out of the second channel 116.

[0100] The port shape of the second channel 116 in the embodiment is adapted to the cross-sectional shape of the polarity terminal 1111. The shape of the port of the second channel 116 is circular, the cross section of the polarity terminal 1111 is also circular, and the diameter of the two ports of the second channel 116 is slightly larger than the outer diameter of the polarity terminal 1111. In other embodiments, the shape of the two ports of the second channel 116 can be different from the cross-sectional shape of the polarity terminal 1111, as long as the polarity terminal 1111 can be inserted into the second channel 116 and sealing can be realized.

[0101] When the battery module 1 is constructed, the heat exchange pipes 113 of the single batteries 111 on the same side can be communicated, two heat exchange channels are formed on the top of the battery pack 11, and the two heat exchange channels can be connected in parallel or in series. The heat exchange of the battery pack 11 is realized based on the two heat exchange channels.

[0102] When the heat exchange pipes 113 are connected, a connecting pipe section can be connected to the inlet end or the outlet end of the heat exchange pipe 113. Taking the connection of the inlet end as an example, the connecting pipe section of one heat exchange pipe 113 can be inserted into the outlet end of another heat exchange pipe 113, so that the two adjacent heat exchange pipes 113 are communicated, and the connection position of the connecting pipe section and the other heat exchange pipe 113 needs to be sealed. Figure 5As shown, connecting pipe sections can also be provided at the liquid inlet and liquid outlet of each heat exchange pipe 113. Among two adjacent heat exchange pipes 113, the connecting pipe section of one heat exchange pipe 113 and the connecting pipe section of the other heat exchange pipe 113 are connected through an intermediate pipe section 1110.

[0103] like Figure 6 and Figure 7 As shown, since an insulating heat exchange medium flows in the heat exchange tube 113, the sealing of the heat exchange tube 113 is particularly important. In order to ensure the sealing of the heat exchange tube 113, in this embodiment, two second annular grooves extending along the circumference of each polarity terminal 1111 are opened, and the two second annular grooves are arranged along the z direction; and O-rings 118 are embedded in the two second annular grooves. The two O-rings 118 are respectively pressed against the two ports of the second channel 116, thereby achieving sealing and improving the stability of the heat exchange tube 113.

[0104] In some other embodiments, when a heat exchange fitting 113 made of metal is used, the polarity terminal 1111 and the top port of the second channel 116 can be sealed by welding (the top port mentioned here is the port close to the electrical connection part of the polarity terminal 1111, and the welding method can further improve the stability of the heat exchange fitting 113 on the polarity terminal 1111).

[0105] In order to facilitate connection with the heat transfer unit, this embodiment further connects transfer tubes 14 to the liquid inlet and outlet ends of the heat exchange device, and connection with the heat transfer unit is achieved through the transfer tubes 14.

[0106] At the same time, in this embodiment, the polarity terminal 1111 of the single cell 111 is provided with a structure that increases the heat exchange area of ​​the polarity terminal. For ease of description, the structure that can increase the heat exchange area of ​​the polarity terminal is collectively referred to as the functional structure 1115. When the polarity terminal 1111 of each single cell 111 passes through the heat exchange device, the portion of the polarity terminal 1111 provided with the functional structure 1115 is located within the heat exchange device and is in direct contact with the insulating heat exchange medium. After constructing the battery module 1 based on such single cells 111, the heat exchange area between the polarity terminal 1111 and the insulating heat exchange medium can be increased, thereby improving the heat exchange effect between the insulating heat exchange medium and the battery module 1. The functional structure 1115 on the polarity terminal 1111 can specifically adopt the following structure:

[0107] First, as Figure 8As shown, the functional structure 1115 includes at least one first annular groove opened in the side surface of the polarity terminal 1111, and a plurality of first annular grooves are arranged along the height direction of the polarity terminal 1111, and each first annular groove extends along the circumference of the side surface of the polarity terminal 1111. On the premise of not affecting the conductive performance of the polarity terminal 1111, the number of the first annular grooves and the groove width and groove depth and other dimensions can be adjusted according to the needs. Based on the first annular groove, the heat exchange area of the part of the polarity terminal 1111 can be increased, and after the part is located in the inner cavity of the heat exchange device, compared with the polarity terminal 1111 with a smooth side surface, the polarity terminal with the point-shaped pit and the protrusion has a larger heat exchange area, and thus a better heat exchange effect can be obtained.

[0108] Second, the functional structure 1115 includes a point-shaped pit, a protrusion and the like located in the side surface of the polarity terminal 1111, and based on the point-shaped pit and the protrusion, the heat exchange area of the part of the polarity terminal 1111 can be increased, and after the part is located in the inner cavity of the heat exchange device, compared with the polarity terminal 1111 with a smooth side surface, the polarity terminal with the point-shaped pit and the protrusion has a larger heat exchange area, and thus a better heat exchange effect can be obtained.

[0109] Third, the functional structure 1115 includes a through hole opened in the polarity terminal 1111 and penetrating through the polarity terminal 1111, on the premise of not affecting the conductive performance of the polarity terminal 1111, the cross-sectional area of the through hole is increased as much as possible to increase the heat exchange area and improve the heat exchange effect, and two or more than two through holes can also be opened on the premise of not affecting the conductive performance of the polarity terminal 1111.

[0110] It should be noted that:

[0111] Since the polarity terminal of the utility model directly contacts with the insulating heat exchange medium, the ideal insulating heat exchange 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 the like. In the utility model, the insulating heat exchange medium is the common insulating heat exchange medium in the prior art, which can be but is not limited to insulating oil and fluorinated liquid and the like;

[0112] After the heat exchange pipe fitting 113 contacts with the top plate of the cylinder 121 or the polarity terminal 1111, short circuit may be caused, and at this time, insulation between the heat exchange pipe fitting 113 and the top plate of the cylinder 121 or the polarity terminal 1111 needs to be realized, and the following methods can be used to realize the insulation:

[0113] 1.1, selecting the heat exchange pipe fitting 113 made of insulating material;

[0114] 1.2, selecting the intermediate pipe section 1110 made of insulating material;

[0115] 1.3, the heat exchange pipe 113 made of non-insulating material can be insulated, such as spraying insulating paint, wrapping insulating film, etc., to overcome the problem; the insulating sealing pad can be additionally arranged between the heat exchange pipe 113 and the polar terminal 1111 and the top of the cylinder to overcome the problem; of course, in order to be safe, multiple insulation methods can be combined to overcome the problem;

[0116] In order to further improve the stability of the heat exchange pipe 113 on the single battery 111, the L-shaped connecting rib can be additionally arranged between the heat exchange pipe 113 and the cylinder 121, the horizontal plate of the L-shaped connecting rib is fixedly connected with the heat exchange pipe 113, and the vertical plate of the L-shaped connecting rib is fixedly connected with the cylinder 121. The specific connection method can be selected according to the material of the heat exchange pipe 113, for example, the heat exchange pipe 113 of the embodiment is made of insulating material, so the L-shaped connecting rib and the heat exchange pipe 113 and the cylinder 121 can be fixedly connected by screws; when the heat exchange pipe 113 is made of metal material, the L-shaped connecting rib and the heat exchange pipe 113 and the cylinder 121 can be fixedly connected by welding.

[0117] As shown in Figures 2 to 4 When assembling the battery pack 11, the electrical connection between the single batteries 111 is realized by the electrical connection assembly 13. The electrical connection assembly 13 in the embodiment includes a first electrical connection 131 and a second electrical connection 132, the first electrical connection 131 is used to realize the series connection between the single batteries 111 in the battery pack 11, and the second electrical connection 132 realizes the electrical connection between the battery pack 11 and the external equipment. The single batteries 111 in the battery pack 11 can be connected in series by the following method:

[0118] First, the positive polarity terminals of the single batteries 111 are located on the same side of the single battery 111, and the negative polarity terminals of the single batteries 111 are located on the other side of the single battery 111; that is, the adjacent single batteries 111 have the same polarity of the same side polarity terminal 1111, and the polarity terminals 1111 of different polarity of the adjacent single batteries 111 are electrically connected by the first electrical connection 131 arranged in the x direction, and the two second electrical connections 132 are electrically connected with the single batteries 111 at both ends of the battery pack 11, and the two second electrical connections 132 are respectively used as the electrical connection terminals of the battery pack 11;

[0119] Second, the adjacent single battery 111 is located at the same side of the polarity terminal 1111 with different polarity, that is, the positive polarity terminal of one of the adjacent two single batteries 111 and the negative polarity terminal of the other single battery 111 are located at the same side of the battery pack 11; at this time, the polarity of the polarity terminal 1111 of the adjacent two single batteries 111 located at the same side is opposite, and the polarity terminal 1111 of the adjacent single battery 111 located at the same side is electrically connected by the first electrical connection piece 131 arranged in parallel with the x direction; the two second electrical connection pieces 132 are electrically connected with the single batteries 111 at both ends of the battery pack 11, and the two second electrical connection pieces 132 are respectively used as the electrical connection terminals connected outside the battery pack 11;

[0120] The first electrical connection piece 131 and the second electrical connection piece 132 are generally an electrical connection plate, which is welded on the polarity terminal 1111 of each single battery 111 when electrically connected with the polarity terminal 1111 of each single battery 111, or a screw is used to fix the electrical connection plate on the polarity terminal 1111 of each single battery 111 to realize electrical connection.

[0121] On the basis of the above-mentioned battery module of the embodiment, an insulating sealing glue layer is laid on the top of the cylinder 121. The main part of the heat exchange device is located in the insulating sealing glue layer, and the liquid inlet end and the liquid outlet end of the heat exchange device are exposed from the insulating sealing glue layer. At the same time, the insulating sealing glue layer also fills the space between the polarity terminal 1111 and the sealing connection piece 15. In this embodiment, the electrical connection part of all the polarity terminals 1111 extends out of the insulating sealing glue layer, so as to be connected with the electrical connection piece assembly.

[0122] Laying the insulating sealing glue layer on the top of the battery module 1 has at least the following advantages:

[0123] I. Further improve the sealing performance of the heat exchange channel; specifically, the insulating sealing glue constituting the insulating sealing glue layer penetrates into the small gap between the heat exchange device and the polarity terminal (the insulating sealing glue cannot pass through the small gap to enter the inner cavity of the heat exchange channel), and further seals the gap in the radial direction;

[0124] II. Secondary sealing of the first avoiding hole 1211 part; even if there is a small gap between the sealing connection piece 15 and the shell of the single battery 111 and the top plate of the cylinder 121 (which does not allow the insulating sealing glue to pass through), filling the insulating sealing glue in the space between the polarity terminal 1111 and the sealing connection piece 15 can also seal such small gaps, so as to further improve the sealing performance of the first avoiding hole 1211 part;

[0125] Three, prevent condensation; due to the temperature difference between the inside and outside of the heat exchange device during long-term use, condensation may occur on the surface, which may cause short circuit problems when the condensation accumulates to a certain amount; the sub-connection pipe 112 or the heat exchange device is wrapped with an insulating sealant layer, and when condensation occurs on the surface of the sub-connection pipe 112 or the heat exchange device, the insulating sealant layer can prevent the battery from short circuiting;

[0126] Four, improve the stability of the heat exchange device; because the heat exchange device is completely wrapped with an insulating sealant layer, the stability of the heat exchange device on the battery module 1 can be further improved.

[0127] In other embodiments, the electrical connection assembly 13 can be connected to the polar terminal 1111, and then an insulating sealant layer can be laid on the top of the battery module 1, that is, the insulating sealant layer completely covers the polar terminal 1111 of the single battery 111 and the connection part of the electrical connection assembly 13 and the polar terminal 1111; in the entire battery module 1, when the cylinder 121 is insulated, only the electrical connection terminal of the electrical connection assembly (used to realize the series connection of the battery module 1) is exposed and charged, and the rest is insulated, so that such a battery module 1 has higher safety performance.

[0128] In order to prevent overflow during the glue injection process, the local structure of the cylinder 121 is used as a glue stop plate in this embodiment, and the height of the side plate of the cylinder 121 is higher than the height of the top plate of the cylinder 121 in the z direction, and the part of the side plate of the cylinder 121 higher than the top plate of the cylinder 121 is used as a glue stop plate.

[0129] As shown in Figure 12 On the basis of the above structure, the present embodiment further provides an insulating protective cover 17 on the top of the battery module, thereby providing insulation protection for the polar terminal 1111 and the heat exchange device, avoiding the safety hazards that may exist in the exposed polar terminal 1111 during the operation of the battery module, and also avoiding the problem that some foreign matters in the external environment fall into the position of the polar terminal 1111, causing the short circuit of the battery module, thereby improving the safety of the battery module. It should be noted that if the insulating protective cover 17 completely wraps the polar terminal 1111, it will cause difficulty in electrical connection of such a battery module 11, therefore, the present embodiment opens a slit on the side wall of the insulating protective cover 17, through which the electrical connection member can be connected with the polar terminal 1111 of the battery module 11, thereby realizing electrical connection. It should be further noted that the side wall of the insulating protective cover 17 also needs to be provided with channels for the liquid inlet and outlet of the heat exchange device to protrude.

[0130] The heat exchange device of the above-mentioned battery module 1 is mainly used for heat exchange with each single battery, and the heat exchange device has an insulating heat exchange medium. After the insulating heat exchange medium exchanges heat with the battery module 1, it is transported to the heat treatment unit 4 through the heat transport unit 3, thereby improving the safety of the battery module 1.

[0131] The heat delivery unit 3 in the embodiment is used to realize the delivery of the insulating heat exchange medium between the heat exchange device of each battery module and the heat treatment unit 4. The heat delivery unit 3 comprises a liquid supply pipeline assembly 33, a liquid outlet pipeline assembly 34, a liquid inlet pipeline assembly 31 and a liquid return pipeline assembly 32. The liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are mainly used to realize the delivery of the insulating heat exchange medium between the heat treatment unit 4 and each battery cluster, and the liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 are used to realize the delivery of the insulating heat exchange medium in each battery cluster.

[0132] In specific work, the liquid supply pipeline assembly 33 delivers the insulating heat exchange medium in the heat treatment unit 4 to each battery cluster, and the liquid outlet pipeline assembly 34 collects the insulating heat exchange medium after heat exchange of each battery cluster to the heat treatment unit 4. The number of the liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 is consistent with the number of the battery clusters. In each battery cluster, the liquid inlet pipeline assembly 31 divides the insulating heat exchange medium in the liquid supply pipeline assembly 33 into a plurality of battery modules 1, and the liquid return pipeline assembly 32 collects the insulating heat exchange medium after heat exchange of the plurality of battery modules 1 to the liquid outlet pipeline assembly 34. The insulating heat exchange medium forms a circulation loop through the liquid supply pipeline assembly 33, the liquid outlet pipeline assembly 34, the liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 and the heat treatment unit 4, and controls the temperature of the battery modules 1 in each battery cluster.

[0133] The pipeline arrangement of the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 is described in detail below.

[0134] If the number of the battery clusters in the energy storage device is one, the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are both single pipelines, which are connected with the liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 and the heat treatment unit 4 respectively to realize the delivery of the insulating heat exchange medium.

[0135] If the number of the battery clusters in the energy storage device is N, N is greater than 1, and the N battery clusters are arranged in a matrix, the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are both combinations of multiple pipelines, and the pipeline arrangement is made according to the arrangement of the battery clusters. The specific arrangement is as follows:

[0136] First, the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 include N liquid supply pipelines and N liquid outlet pipelines; the N liquid supply pipelines are connected one by one to the liquid inlet pipeline assemblies 31 in the N battery clusters, and the other ends are connected to the heat treatment unit 4; the N liquid outlet pipelines are connected one by one to the liquid return pipeline assemblies 32 in the N battery clusters, and the other ends are connected to the heat treatment unit 4. That is, each battery cluster is connected to the heat treatment unit 4 using an independent pipeline. This pipeline arrangement requires a large number of pipelines to be installed and manufactured. At the same time, the heat treatment unit 4 needs to be provided with N liquid inlets and N liquid outlets, making the structure of the heat treatment unit 4 relatively complex;

[0137] Second, if Figure 10 As shown, the liquid supply pipeline assembly 33 includes a primary diverter pipe 331, a secondary diverter pipe 332, and a tertiary diverter pipe 333; the inlet of the primary diverter pipe 331 is used to connect to the heat treatment unit 4; the secondary diverter pipe 332 is used to divert the insulating heat exchange medium in the primary diverter pipe 331 to different columns or rows of battery clusters, and the tertiary diverter pipe 333 is used to divert the insulating heat exchange medium in the secondary diverter pipe 332 to the same column or row of battery clusters;

[0138] The liquid outlet pipeline assembly 34 includes a primary converging pipe 341, a secondary converging pipe 342 and a tertiary converging pipe 343; the tertiary converging pipe 343 is used to converge the insulating heat exchange medium in the battery clusters in the same column or row into the secondary converging pipe 342; the secondary diversion pipe 332 is used to converge the insulating heat exchange medium in different columns or rows of battery clusters into the primary converging pipe 341; the outlet of the primary converging pipe 341 is used to connect to the heat treatment unit 4.

[0139] The liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are manufactured using multi-stage piping, allowing the insulating heat exchange medium flowing out of the heat treatment unit 4 to be divided and evenly distributed to each battery cluster step by step. This balances the flow of insulating heat exchange medium allocated to each battery cluster, ensuring that each battery cluster and each battery module 1 within the battery cluster has a good and balanced heat dissipation effect, thereby improving the operating stability and service life of the energy storage device. At the same time, the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are manufactured using multi-stage piping, so that the heat treatment unit 4 only needs to be provided with a single liquid inlet and a single liquid outlet, resulting in a relatively simple structure of the heat treatment unit 4. Furthermore, the entire pipeline is also relatively convenient to manufacture and install.

[0140] In this embodiment, a water supply joint may be provided on the first-level diversion pipe 331 for replenishing the insulating heat exchange medium to the temperature control system. An exhaust valve is provided on the first-level confluence pipe 341 for exhausting the air in the temperature control system. The water supply joint and the exhaust valve work together to enable the temperature control system to efficiently control the temperature of each battery module 1, thereby improving the temperature control effect of the temperature control system.

[0141] After the above-mentioned liquid supply pipeline assembly 33 divides the insulation heat exchange medium treated by the heat treatment unit 4 to the plurality of battery clusters, each battery cluster realizes the delivery of the insulation heat exchange medium of each battery module 1 in the battery cluster through the liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 respectively. The pipeline arrangement of the liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 will be described in detail below.

[0142] The liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 are specifically installed and manufactured according to the number and arrangement mode of the battery modules 1 in the battery cluster. In the embodiment, a plurality of battery modules 1 are arranged in sequence in the horizontal direction to form a battery module unit, and then a plurality of battery module units are arranged in sequence in the vertical direction to form a battery cluster. At this time, the liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 can be manufactured in the following manner:

[0143] As shown in Figure 11 and Figure 12 , the liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 are respectively manufactured and installed with the heat exchange device, and the liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 are manufactured through multiple levels of pipelines.

[0144] The liquid inlet pipeline assembly 31 specifically includes a first liquid inlet pipeline 311, a second liquid inlet pipeline 312, and a third liquid inlet pipeline 313. The liquid inlet of the first liquid inlet pipeline 311 is used to connect with the liquid supply pipeline assembly 33. A plurality of second liquid inlet pipelines 312 are connected with the first liquid inlet pipeline 311, and each second liquid inlet pipeline 312 respectively provides the insulation heat exchange medium to each battery module unit, that is, the plurality of second liquid inlet pipelines 312 divide the insulation heat exchange medium in the first liquid inlet pipeline 311 to the plurality of battery module units one by one. A plurality of third liquid inlet pipelines 313 are connected with the second liquid inlet pipeline 312, and at the same time, each third liquid inlet pipeline 313 is connected with the adapter pipe 14 of the liquid inlet end of the heat exchange device of each battery module 1. Each third liquid inlet pipeline 313 respectively provides the insulation heat exchange medium to each battery module 1, that is, the plurality of third liquid inlet pipelines 313 divide the insulation heat exchange medium in the second liquid inlet pipeline 312 to the plurality of battery modules 1.

[0145] The above-mentioned liquid return pipeline assembly 32 includes a first liquid outlet pipeline 321, a second liquid outlet pipeline 322, and a third liquid outlet pipeline 323. Each third liquid outlet pipeline 323 is connected with the adapter pipe 14 of the liquid outlet end of the heat exchange device of each battery module 1, and at the same time, a plurality of third liquid outlet pipelines 323 are connected with the second liquid outlet pipeline 322 to converge the insulation heat exchange medium after heat exchange of the plurality of battery modules 1 to the second liquid outlet pipeline 322. Each second liquid outlet pipeline 322 is connected with the first liquid outlet pipeline 321 to converge the insulation heat exchange medium after heat exchange of the plurality of battery module units to the first liquid outlet pipeline 321. The first liquid outlet pipeline 321 is connected with the liquid outlet pipeline assembly 34.

[0146] As shown in Figure 12As shown, the above-mentioned three-stage liquid inlet pipe 313 and three-stage liquid outlet pipe 323 can adopt flexible pipes, and are specifically made of metal bellows. The flexible pipes reduce the installation error with the battery module 1, reduce the installation requirements on site, and further increase the installation convenience of the temperature control pipe assembly.

[0147] The above-mentioned liquid inlet pipe assembly 31 and liquid return pipe assembly 32 are made of multi-stage pipes, so that the insulation heat exchange medium flowing out of the liquid supply pipe assembly 33 is distributed step by step and evenly to each battery module 1, and the flow of the insulation heat exchange medium distributed to each battery module 1 is balanced, so that each battery module 1 in the battery cluster has good and balanced heat dissipation effect, thereby improving the working stability and service life of the energy storage equipment.

[0148] As shown in Figure 12 The above-mentioned two-stage liquid inlet pipe 312 and two-stage liquid outlet pipe 322 can be formed by splicing multiple sections of pipes, that is, the two-stage liquid inlet pipe 312 and two-stage liquid outlet pipe 322 can be formed by splicing multiple sections of pipes and three-way joints. This splicing connection reduces the error and assembly difficulty when connecting the pipes, and is very convenient to install and disassemble. At the same time, when subsequent maintenance is required, only the pipe connectors of the relevant battery module 1 need to be removed for maintenance, without the need to disassemble the entire temperature control pipe assembly, thereby facilitating installation and maintenance.

[0149] As shown in Figure 11 To further facilitate connection, the two-stage liquid outlet pipe 322 is connected to the one-stage liquid outlet pipe 321 by using a quick plug connector 36 and a hose 35. The hose 35 reduces the installation error when connecting the two-stage liquid outlet pipe 322 and the one-stage liquid outlet pipe 321, reduces the installation requirements on site, and further increases the installation convenience of the temperature control pipe assembly. The quick plug connector 36 can realize quick installation of the two-stage liquid outlet pipe 322 and the one-stage liquid outlet pipe 321, and can be directly plugged and unplugged without the need for tools, thereby improving the convenience of installation or disassembly. In addition, the above-mentioned quick plug connector 36 also has a bidirectional self-sealing function, which can automatically cut off the flow of liquid during plugging and unplugging of the quick plug connector 36, so that the insulation heat exchange medium in the pipes does not need to be emptied when the battery module 1 and the pipe assembly are maintained, thereby improving the convenience of maintenance and the dismountability of the pipes, and facilitating subsequent maintenance and replacement of the main pipe.

[0150] As shown in Figure 9 and Figure 10As shown, when the above-mentioned liquid supply pipeline assembly 33 and liquid outlet pipeline assembly 34, liquid inlet pipeline assembly 31 and liquid return pipeline assembly 32 are arranged in the energy storage device, the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are both located at the top of the battery cluster, which occupies less installation space, so that the integration of the pipeline assembly is high. The liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 are located on the same side of the battery cluster, which improves the connectivity of the entire liquid inlet pipeline assembly 31 and the liquid return pipeline assembly 32 and the compactness of the pipeline arrangement, avoids pipeline stacking and crossing, increases the inconvenience of connection, and improves the installation and layout convenience.

[0151] As shown, Figure 13 when installed, the first liquid inlet pipeline 311 and the first liquid outlet pipeline 321 are located on both sides of the battery module 1, and meanwhile, the plurality of battery clusters are arranged in a plurality of rows. In the same row of battery clusters, the first liquid outlet pipelines 321 of adjacent battery clusters can share one pipeline. This arrangement can reduce the number of pipelines and also omit the third converging pipeline 343 in the liquid outlet pipeline assembly 34, so that the liquid outlet pipeline assembly 34 and the liquid return pipeline assembly 32 are more convenient to set.

[0152] In addition, the above-mentioned liquid supply pipeline assembly 33 and liquid outlet pipeline assembly 34, liquid inlet pipeline assembly 31 and liquid return pipeline assembly 32 are provided with a heat preservation layer on all or part of the pipelines. The heat preservation layer can effectively prevent the loss of cold or heat of the insulation heat exchange medium, reduce energy consumption, and also avoid condensation on the walls of the pipelines. Meanwhile, the diameters of the pipelines gradually decrease from the heat treatment unit 4 to the battery module, that is, the diameter of the first diverging pipeline 331 > the diameter of the second diverging pipeline 332 > the diameter of the third diverging pipeline 333 > the diameter of the first liquid inlet pipeline 311 > the diameter of the second liquid inlet pipeline 312 > the diameter of the third liquid inlet pipeline 313 > the diameter of the first liquid outlet pipeline 321 > the diameter of the second liquid outlet pipeline 322 > the diameter of the third liquid outlet pipeline 323. This arrangement makes the flow deviation of the insulation heat exchange medium for heat exchange with each battery module 1 smaller, reduces the temperature difference of the battery module, and improves the service life of the battery module.

[0153] As shown, Figure 1 , Figure 9 and Figure 10 As shown, the heat treatment unit 4 in the embodiment includes a temperature control machine 41, which is used to heat or cool the insulation heat exchange medium (which can be water, ethylene glycol / water, propylene glycol / water, methanol / water, ethanol / water, calcium formate / water, etc.). The temperature control machine 41 is a device with heating and / or cooling functions, such as a cooling and heating machine or a water chiller, etc., which is used to heat or cool the insulation heat exchange medium delivered by the heat delivery unit 3.

[0154] As shown, Figure 9and Figure 10 As shown in the drawings, the temperature control machine 41 is generally provided with an inlet and an outlet, and the temperature control machine 41 is connected with the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 through the inlet and the outlet. At this time, in order to facilitate maintenance, the inlet and the outlet of the temperature control machine 41 are provided with a blocking joint 44, which can block the insulation heat exchange medium in the temperature control machine 41 when the temperature control machine 41 is installed and removed.

[0155] As shown in the drawings, the temperature control machine 41 is generally provided with an inlet and an outlet, and the temperature control machine 41 is connected with the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 through the inlet and the outlet. At this time, in order to facilitate maintenance, the inlet and the outlet of the temperature control machine 41 are provided with a blocking joint 44, which can block the insulation heat exchange medium in the temperature control machine 41 when the temperature control machine 41 is installed and removed. Figure 14 As shown in the drawings, 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 33 and the liquid outlet pipeline assembly 34 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 inlet and the outlet of the temperature control machine 41. The adjusting valve 442 can be a butterfly valve. When the temperature control machine 41 is working normally, the adjusting valve 442 is in a normally open state, and the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are in a normal flow state with the insulation heat exchange medium in the temperature control machine 41. When the temperature control machine 41 needs to be removed and maintained, the adjusting valve 442 is closed, and the blocking joint 44 blocks the inflow and outflow of the insulation heat exchange medium in the temperature control machine 41. At this time, the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are in a disconnected state with the insulation heat exchange medium in the temperature control machine 41, and then the temperature control machine 41 can be directly removed from the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 without the need for corresponding liquid discharge operation, thereby improving the convenience and reliability during maintenance.

[0156] Example 2

[0157] As shown in the drawings, the temperature control machine 41 is generally provided with an inlet and an outlet, and the temperature control machine 41 is connected with the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 through the inlet and the outlet. At this time, in order to facilitate maintenance, the inlet and the outlet of the temperature control machine 41 are provided with a blocking joint 44, which can block the insulation heat exchange medium in the temperature control machine 41 when the temperature control machine 41 is installed and removed. Figures 15 to 17 As shown in the drawings, 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 33 and the liquid outlet pipeline assembly 34 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 inlet and the outlet of the temperature control machine 41. The adjusting valve 442 can be a butterfly valve. When the temperature control machine 41 is working normally, the adjusting valve 442 is in a normally open state, and the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are in a normal flow state with the insulation heat exchange medium in the temperature control machine 41. When the temperature control machine 41 needs to be removed and maintained, the adjusting valve 442 is closed, and the blocking joint 44 blocks the inflow and outflow of the insulation heat exchange medium in the temperature control machine 41. At this time, the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 are in a disconnected state with the insulation heat exchange medium in the temperature control machine 41, and then the temperature control machine 41 can be directly removed from the liquid supply pipeline assembly 33 and the liquid outlet pipeline assembly 34 without the need for corresponding liquid discharge operation, thereby improving the convenience and reliability during maintenance.

[0158] In this embodiment, the heat exchange device includes a hollow box body 117 with one end open. In order to ensure the regularity of the structure of the battery module 1, a component with a shape and size suitable for the top plate of the cylinder body 121 is usually used as the heat exchange device. In this embodiment, the top plate of the cylinder body 121 is a rectangular plate, so the hollow box body 117 is a cubic box body. A second avoiding hole 1174 is formed in the hollow box body 117 opposite to the open end, corresponding to each single battery 111 polarity terminal 1111. When the heat exchange device with such a structure is fixed on the top of the cylinder body 121, it is buckled on the top of the cylinder body 121, and the open end is fixed and sealed with the cylinder body 121. In the z direction, the polarity terminal 1111 penetrates the heat exchange device, that is, part of the structure of the polarity terminal 1111 is located inside the heat exchange device and directly contacts the insulating heat exchange medium, and the polarity terminal 1111 and the corresponding second avoiding hole 1174 are sealed. Another part of the structure of the polarity terminal 1111 is located outside the heat exchange device and is connected with the electrical connection assembly 13. The cavity formed by the hollow box body 117 and the top plate of the cylinder body 121 serves as a heat exchange channel.

[0159] In this embodiment, in the heat exchange channel formed by the hollow box body 117, the insulating heat exchange medium not only directly exchanges heat with the polarity terminal 1111 of each single battery 111, but also directly contacts the top plate of the cylinder body 121. The insulating heat exchange medium can also directly act on the top plate of the cylinder body 121, further improving the heat exchange effect of the insulating heat exchange medium on each single battery, and having a better heat exchange effect on the battery module 1.

[0160] As shown in Figure 16 and Figure 17 , in this embodiment, a hollow box body 117 made of insulating material with one end open is selected. The hollow box body 117 is buckled on the top plate of the cylinder body 121. In order to ensure that the electrical connection part of each single battery 111 polarity terminal 1111 can smoothly pass through the corresponding second avoiding hole 1174 on the hollow box body 117, the second avoiding hole 1174 needs to have an area slightly larger than the area of the electrical connection part of the corresponding polarity terminal 1111 in the xy plane. In the z direction, it is necessary to ensure that the electrical connection part of the corresponding polarity terminal 1111 can smoothly pass through the corresponding second avoiding hole 1174.

[0161] Generally, the shape of the second avoiding hole 1174 is matched with the cross-sectional shape of the electric connection part of the polarity terminal 1111. If the second avoiding hole 1174 is a round hole and the cross-section of the electric connection part of the polarity terminal 1111 is circular, the diameter of the second avoiding hole 1174 needs to be slightly larger than the outer diameter of the electric connection part of the polarity terminal 1111. If the second avoiding hole 1174 is a square hole and the cross-section of the electric connection part of the polarity terminal 1111 is square, the area of the second avoiding hole 1174 needs to be slightly larger than the cross-sectional area of the electric connection part of the polarity terminal 1111. Of course, the shape of the second avoiding hole 1174 can also be unmatched with the cross-sectional shape of the electric connection part of the polarity terminal 1111, as long as the electric connection part of the polarity terminal 1111 can smoothly pass through the corresponding second avoiding hole 1174 and the sealing between them can be realized.

[0162] When the insulating heat exchange medium is a liquid insulating heat exchange medium, the sealing performance of the hollow box body 117 is particularly important. In order to ensure the sealing performance of the hollow box body 117, the hollow box body 117 is preferably made of an insulating material. When the hollow box body 117 is made of a non-insulating material, an insulating sealing ring can be additionally arranged between the polarity terminal 1111 and the hollow box body 117 to overcome the problem. Figure 17 As can be seen, in the embodiment, a step structure is arranged on each polarity terminal 1111 along the circumferential direction thereof, and a sealing glue layer is laid on the step face. When the electric connection part of the polarity terminal 1111 extends out of the corresponding second avoiding hole 1174 of the hollow box body 117, the area around the second avoiding hole 1174 of the hollow box body 117 is crimped on the sealing glue layer, and at the same time, the sealing glue layer penetrates into the gap between the second avoiding hole 1174 and the polarity terminal 1111, thereby realizing the sealing between the polarity terminal 1111 and the second avoiding hole 1174. In other embodiments, an O-shaped sealing ring can also be sleeved between the polarity terminal 1111 and the second avoiding hole 1174 to realize the sealing therebetween.

[0163] The heat exchange device in the embodiment is easy to contact the pressure-bearing shell and the polarity terminal 1111 of each single battery. If the heat exchange device is conductive, there is a short circuit problem. Therefore, the heat exchange device in the embodiment preferably adopts an insulating material. When a non-insulating material is adopted, an insulating sealing ring can be additionally arranged between the polarity terminal 1111 and the heat exchange device to overcome the problem. The heat exchange device can also be insulated, for example, by spraying insulating paint or wrapping an insulating film. In order to be safe, multiple insulation methods can be combined to overcome the problem.

[0164] In other embodiments, a hollow box body 117 with one end open can be selected from a metal material. In order to ensure the insulation between the polarity terminal 1111 and the second avoiding hole 1174, an O-shaped insulating sealing ring can be additionally arranged therebetween to realize the insulation and the sealing therebetween. The open end of the hollow box body 117 and the cylinder body 121 can be fixed and sealed by welding.

[0165] As Figure 16 and Figure 17As shown, to further improve the sealing performance of the heat exchange device, the hollow box 117 can adopt the following structure: the hollow box 117 includes a sealing top plate 1171, two first side plates 1173, and two second side plates 1172. The first side plates are parallel to the yz plane, and the second side plates are parallel to the xz plane. When manufacturing the cylinder 121, the two second side plates 1172 are integrally formed with the cylinder 121. When constructing the heat exchange device, it is only necessary to fix the sealing top plate 1171 and the first side plates 1173 of the hollow box 117. In this structure, only the sealing top plate 1171 needs to be insulated.

[0166] Example 3

[0167] like Figures 18 to 20 As shown, the energy storage device in this embodiment is similar to the energy storage device in Example 1, except that the structure of the heat exchange device of the battery module in this embodiment is different from that in Example 1. The heat exchange device in this embodiment is implemented by the following structure:

[0168] The heat exchange device includes at least one heat exchange plate 114, which has a first channel 115 extending along the x-direction and at least one group of second channels 116 arranged along the x-direction. The first channel 115 in the heat exchange plate 114 serves as a heat exchange channel, and each second channel 116 runs through the z-direction and is connected to the first channel 115; the polarity terminal 1111 of each single battery 111 passes through the second channel 116 in the z-direction and is electrically connected to the electrical connection assembly. Part of the structure of the polarity terminal of each single battery is located in the heat exchange channel and is in direct contact with the insulating heat exchange medium. The side walls of the polarity terminal 1111 of each single battery 111 are sealed between the heat exchange plate 114.

[0169] The heat exchange device will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0170] a. Figure 18 and Figure 19 As shown, the heat exchange device includes two heat exchange plates 114 arranged along the y direction, and each heat exchange plate 114 corresponds to the polarity terminals 1111 of all the single batteries 111 in the battery pack 11 on the same side;

[0171] Each heat exchange plate 114 is provided with a first channel 115 and a group of second channels 116 arranged along the x-direction. The number of second channels 116 is the same as the number of single cells 111. The first channels 115 are continuous along the x-direction. The second channels 116 are continuous along the z-direction and connected to the first channels 115. The polarity terminals 1111 of all single cells 111 on one side pass through the second channels 116 on one heat exchange plate 114 and are electrically connected to the electrical connection assembly 13. The polarity terminals 1111 of all single cells 111 on the other side pass through the second channels 116 on the other heat exchange plate 114 and are electrically connected to the electrical connection assembly 13. At the same time, the two ends of each second channel 116 are sealed from the polarity terminals 1111.

[0172] The two heat exchange plates 114 are respectively mounted on the polarity terminals 1111 on different sides of the battery pack 11, and the two heat exchange plates 114 can be connected in series. In some other embodiments, the two heat exchange plates 114 can also be connected in parallel.

[0173] b. Figure 20 and Figure 21 As shown, the heat exchange device includes a heat exchange plate 114, which is provided with a first channel 115 and two groups of second channels 116 arranged along the x-direction. The first channel 115 is continuous along the x-direction. The number of the second channels 116 is twice the number of the single cells 111. Each second channel 116 is a second channel 116 along the z-direction and is connected to the first channel 115. The polarity terminals 1111 of all the single cells 111 in the battery pack 11 pass through the second channels 116 on the heat exchange plate 114 respectively and are electrically connected to the electrical connection assembly 13. At the same time, the two ports of the second channel 116 are sealed from the polarity terminals 1111.

[0174] The present invention does not impose any specific restrictions on the cross-sectional shape of the heat exchange plate 114. Since the heat exchange plate 114 in this embodiment is placed on a planar top plate structure, considering the structural regularity, it can be seen from the figure that the heat exchange plate 114 in this embodiment is a rectangular plate. In other embodiments, heat exchange plates with other structural forms may also be used.

[0175] The first channel 115 is a channel extending along the length of the heat exchange plate 114. In the present invention, after the heat exchange plate 114 is fixed to the top of the cylinder, the length of the heat exchange plate 114 is consistent with the length of the cylinder 121. Therefore, it can be considered that the first channel 115 extends along the x-direction, and the two end ports of the first channel 115 serve as the liquid inlet and outlet of the heat exchange plate 114.

[0176] The second channel 116 is a channel 1112 penetrating the heat exchange plate 114 and communicating with the first channel 115, in the utility model, the extending direction of the second channel 116 is consistent with the height direction of the single battery 111.

[0177] In addition, each group of second channels 116 needs to correspond to the polarity terminal 1111 of the plurality of single batteries 111 on the same side; in the z direction (the height direction of the single battery 111), the size of the second channel 116 is less than the size of the corresponding polarity terminal 1111, so that the top of the polarity terminal 1111 can extend out of the second channel 116 as an electrical connection part.

[0178] The port shape of the second channel 116 in the embodiment is adapted to the cross-sectional shape of the polarity terminal 1111, the shape of the port of the second channel 116 is circular, the cross section of the polarity terminal 1111 is also circular, and the caliber of the two ports of the second channel 116 is slightly larger than the outer diameter of the polarity terminal 1111; in other embodiments, the shape of the two ports of the second channel 116 can be different from the cross-sectional shape of the polarity terminal 1111, as long as the polarity terminal 1111 can be inserted into the second channel 116 and sealing can be achieved.

[0179] After the heat exchange device is installed on the top of the cylinder body, the two ports of the heat exchange device are respectively used as a liquid inlet end and a liquid outlet end, in order to facilitate connection with the heat transport unit, the embodiment further connects an adapter pipe 14 to the liquid inlet end and the liquid outlet end of the heat exchange device, and connection with the heat transport unit is realized through the adapter pipe 14.

[0180] As shown in Figure 22 Because the insulating heat exchange medium flows in the heat exchange plate 114, the sealing property of the heat exchange plate 114 is particularly important, in order to ensure the sealing property of the heat exchange plate 114, two second annular grooves extending along the circumferential direction of each polarity terminal 1111 are formed on each polarity terminal 1111 in the embodiment, the two second annular grooves are arranged along the z direction, and O-shaped sealing rings 118 are embedded in the two second annular grooves, the two O-shaped sealing rings 118 are respectively pressed against the two ports of the second channel 116, so that sealing is realized, and the stability of the heat exchange plate 114 can also be improved.

[0181] It should be noted that the heat exchange plate 114 contacts the polarity terminal 1111 of the plurality of single batteries 111 and the pressure-bearing shell for polarity heat exchange, in order to avoid short circuit problems, the following methods can be used to realize insulation between the heat exchange plate 114 and the polarity terminal 1111:

[0182] 3.1, the heat exchange plate 114 made of insulating material is selected, so that insulation between the heat exchange plate 114, the pressure-bearing shell and the polarity terminal 1111 can be realized, and insulation between the heat exchange plate 114 and the top of the battery pack 11 can also be realized;

[0183] 3.2. Use a heat exchange plate 114 made of non-insulating material and add an insulating ring between the polarity terminal 1111 and the heat exchange plate 114. Insulate the side wall of the heat exchange plate 114, such as spraying insulating paint or wrapping it with insulating film. To be on the safe side, you can combine the above methods and adopt multiple insulation methods to overcome this problem.

[0184] In this embodiment, the heat exchange plate 114 is made of insulating material to achieve insulation between the heat exchange plate 114 and the top of the battery pack 11 and the polarity terminals 1111 .

[0185] To further improve the stability of the heat exchange plate 114 on the battery pack 11, this embodiment can add L-shaped connecting ribs between the heat exchange plate 114 and the cylinder 121. The horizontal plate of the L-shaped connecting rib is fixedly connected to the heat exchange plate 114, and the vertical plate of the L-shaped connecting rib is fixedly connected to the cylinder 121. The specific connection method can be selected according to the material of the heat exchange plate 114. For example, in this embodiment, the heat exchange plate 114 is made of an insulating material, so the L-shaped connecting rib, the heat exchange plate 114, and the cylinder 121 can be fixedly connected using screws. If the heat exchange plate 114 is made of metal, the L-shaped connecting rib, the heat exchange plate 114, and the cylinder 121 can be fixedly connected using welding.

[0186] Example 4

[0187] like Figures 23 to 26 As shown, the energy storage device in this embodiment is similar to the energy storage device in Example 1, except that the structure of the heat exchange device of the battery module in this embodiment is different from that in Example 1. The heat exchange device in this embodiment is implemented by the following structure:

[0188] like Figures 23 to 25 As shown, the heat exchange device includes a connecting pipe assembly. The polarity terminal 1111 of each single cell 111 is provided with a channel 1112 that passes through the polarity terminal 1111 along the x-direction. The connecting pipe assembly connects the channels 1112 on the polarity terminals 1111 of adjacent single cells 111 to form a heat exchange channel. At the same time, the connecting pipe assembly is insulated from the polarity terminals 1111 of each single cell 111.

[0189] The polarity terminal 1111 described herein may be a pole of a single cell 111. When the pole height of the single cell 111 does not meet the set requirements, a pole adapter may be connected to the pole of the single cell 111, and the combined structure of the pole and the pole adapter serves as the polarity terminal 1111 of the single cell 111. In this embodiment, the polarity terminal 1111 is a pole of the single cell 111, which is taller than a conventional pole of a single cell 111.

[0190] The shape of the polar terminal 1111 of each single battery 111 is not limited in the embodiment, and the cross section thereof can be square, circular or the like. Meanwhile, the cross section of the channel 1112 is not limited, and the channel 1112 with a regular structure such as a circular or square cross section can be generally adopted. In addition, the cross section area of the channel 1112 is not too large, so as not to affect the conductivity of the polar terminal 1111, and the cross section area of the channel 1112 is not too small, so as not to affect the heat exchange area and the heat exchange effect. The cross section area of the channel 1112 can be as large as possible under the premise of not affecting the conductivity of the polar terminal 1111, so as to increase the heat exchange area and improve the heat exchange effect.

[0191] From Figure 25 It can be seen that the connecting pipe assembly includes a plurality of sub connecting pipes 112. The two ends of each sub connecting pipe 112 are connected with the channels 1112 of the polar terminals 1111 of the adjacent single batteries 111 on the same side, so as to form two heat exchange channels at the top of the battery pack 11. Meanwhile, the sub connecting pipe 112 connects the channels 1112 of the two polar terminals 1111 of the outermost single battery 111 in the battery pack 11, so as to realize the series connection of the two heat exchange channels, form a U-shaped heat exchange channel, and the free ends of the channels 1112 of the two polar terminals 1111 of the other outermost single battery 111 can be directly used as the two ports of the U-shaped heat exchange channel. The two ports of the U-shaped heat exchange channel are used as the liquid inlet port and the liquid outlet port respectively.

[0192] In other embodiments, the two heat exchange channels can be connected in parallel, that is, the ports on one side of the two heat exchange channels are used as the liquid inlet ports, and the ports on the other side of the two heat exchange channels are used as the liquid outlet ports.

[0193] In order to facilitate the connection with the heat delivery unit, the adapter pipe 14 is connected to the channel 1112 of the polar terminal 1111 which is used as the liquid inlet port and the liquid outlet port of the heat exchange channel, so as to realize the connection with the heat delivery unit through the adapter pipe 14.

[0194] In the assembly, the two ends of the sub-connection pipe 112 are respectively inserted into the two ports of the adjacent single battery 111 polarity terminal 1111 channel 1112. When the sub-connection pipe 112 adopts a pipe segment of hard material, it is required that the channels 1112 on the adjacent single battery 111 polarity terminal 1111 must be coaxial to achieve effective connection. However, in some cases, due to the existence of machining errors, it is difficult to guarantee the coaxiality of the channels 1112 on the adjacent single battery 111 polarity terminal 1111, therefore, the non-connection part of the sub-connection pipe 112 (here, the non-connection part is the part of the sub-connection pipe 112 that is not connected with the port of the channel 1112, and can also be understood as the middle segment of the sub-connection pipe 112) is preferably flexible, based on the deformation of the sub-connection pipe 112, to overcome the above machining errors, and facilitate the sealed connection of the sub-connection pipe 112 with the corresponding channel 1112 port.

[0195] As shown in Figure 24 , in order to make the connection of the polarity terminal 1111 of each single battery 111 and the sub-connection pipe 112 more reliable, a fixing part 1113 can also be provided on the side wall of the above-mentioned polarity terminal 1111, which can adopt the following structure:

[0196] First, the fixing part 1113 is an annular boss integrally formed on the side wall of the polarity terminal 1111 and protruding from the side wall of the polarity terminal 1111, and the channel 1112 passes through the annular boss;

[0197] a. As shown in Figure 24 , the annular boss includes a first annular boss, and the outer wall circumferential dimension of the first annular boss is adapted to the inner wall circumferential dimension of the sub-connection pipe 112, that is, the outer wall circumferential dimension of the first annular boss is consistent with or slightly smaller than the inner wall circumferential dimension of the sub-connection pipe 112;

[0198] In connection, the sub-connection pipe 112 is sleeved on the outer wall of the first annular boss to realize the communication of the channels 1112 between the single batteries 111, and in detail, the sub-connection pipe 112 can be sleeved on the first annular boss by interference fit; the fixing part 1113 of this structure can increase the heat exchange area of the insulating heat exchange medium passing through, and also facilitate quick and reliable connection with the sub-connection pipe 112.

[0199] b. The annular boss includes a second annular boss, and the inner wall circumferential dimension of the second annular boss is adapted to the outer wall circumferential dimension of the sub-connection pipe 112, that is, the inner wall circumferential dimension of the second annular boss is consistent with or slightly smaller than the outer wall circumferential dimension of the sub-connection pipe 112;

[0200] When connected, the sub-connection pipe 112 is embedded into the inner wall of the second annular boss to realize the communication of the passages 1112 between the single batteries 111. When connected, the sub-connection pipe 112 can be inserted into the second annular boss through interference fit.

[0201] c. The annular boss comprises a first annular boss and a second annular boss. The outer wall of the first annular boss is adapted to the inner wall of the sub-connection pipe 112 in terms of circumferential size. The inner wall of the second annular boss is adapted to the outer wall of the sub-connection pipe 112 in terms of circumferential size.

[0202] When connected, the sub-connection pipe 112 is clamped in the annular groove between the first annular boss and the second annular boss. At this time, the inner wall of the sub-connection pipe 112 is in contact with the outer wall of the first annular boss, and the outer wall of the sub-connection pipe 112 is in contact with the inner wall of the second annular boss. The fixing part 1113 of this structure can fix the inner wall and the outer wall of the sub-connection pipe 112 at the same time, thereby improving the stability of the connection between the sub-connection pipe 112 and the polar terminal 1111. At the same time, the fixing part 1113 of this structure forms multiple sealed contact surfaces between the sub-connection pipe 112 and the fixing part 1113, thereby further improving the sealing performance and reliability of the connection.

[0203] Second, the fixing part 1113 is a third annular groove provided on the side wall of the polar terminal 1111.

[0204] The third annular groove is similar in shape to the sub-connection pipe 112, and the groove width of the third annular groove is consistent with or slightly smaller than the wall thickness of the sub-connection pipe 112. The groove width of the third annular groove specifically refers to the radial dimension of the third annular groove. When connected, the end of the sub-connection pipe 112 is embedded in the third annular groove. Compared with the structure in which the fixing part 1113 is an annular boss, the fixing part 1113 of this structure can be machined on the existing polar terminal 1111, thereby reducing the manufacturing cost of the polar terminal 1111.

[0205] In addition, since the heat exchange channel flows with insulating heat exchange medium, the sealing performance of the entire heat exchange channel is particularly important. In order to ensure the sealing performance of the heat exchange channel, the sub-connection pipe 112 and the fixing part 1113 of the corresponding polar terminal 1111 are connected in an interference fit manner. In other embodiments, a sealing ring can be additionally arranged between the two to further improve the sealing performance of the connection part. When the sub-connection pipe 112 is made of metal, the connection and sealing between the polar terminal 1111 and the sub-connection pipe 112 can also be achieved by welding. However, attention should be paid to the insulation between the polar terminal 1111 and the sub-connection pipe 112.

[0206] In order to further optimize the heat exchange effect, functional structures can be set on the polarity terminal 1111, including heat-conducting ribs, dot-shaped pits, protrusions, etc. set on the inner wall of the channel 1112; the heat-conducting ribs, dot-shaped pits, and protrusions can increase the contact area between the insulating heat exchange medium and the polarity terminal 1111, thereby effectively improving the heat exchange effect. Figure 24 As shown, in this embodiment, multiple thermally conductive ribs 1114 are disposed within channel 1112. These ribs 1114 are evenly distributed along the circumference of channel 1112, and each rib 1114 extends axially along channel 1112. These ribs 1114 increase the contact area between the insulating heat exchange medium and the polarity terminals 1111, thereby increasing the heat exchange area and effectively improving the heat exchange effect. In other embodiments, the number and arrangement of the thermally conductive ribs 1114 can be adjusted based on the size of channel 1112, so as not to affect the flow of the insulating heat exchange medium.

[0207] It should be noted that:

[0208] 1. Because the polarity terminals 1111 of the present invention are in direct contact with the insulating heat exchange medium, the ideal insulating heat exchange medium should possess excellent insulation, high specific heat capacity and thermal conductivity, good flame retardancy, low cost, suitable operating temperature, long life, and be non-corrosive. In the present invention, the insulating heat exchange medium is a commonly used insulating heat exchange medium in the prior art, including, but not limited to, insulating oil and fluorinated liquid.

[0209] 2. Since the connecting tube assembly is in direct contact with the polarity terminals 1111, the connecting tube 112 and the two polarity terminals 1111 to which it is connected must be insulated. Insulation can usually be achieved by the following methods:

[0210] 2.1. Select the sub-connecting pipe 112 made of insulating material;

[0211] 2.2. If the sub-connecting tube 112 is made of non-insulating material, the wall of the sub-connecting tube 112 can be insulated, for example, by spraying insulating paint or wrapping it with an insulating film. The inner wall where the channel 1112 and the sub-connecting tube 112 are connected can also be insulated, for example, by spraying insulating paint. An insulating sleeve can also be added between the sub-connecting tube 112 and the channel 1112. Of course, for the sake of safety, the above methods can be combined to adopt multiple insulation methods to achieve insulation between the channel 1112, the sub-connecting tube 112, and the polarity terminal 1111.

[0212] 2.3. If the transfer tube 14 is made of metal, insulation between the transfer tube 14 and the polarity terminal 1111 is also required. Specifically, the insulation treatment can be achieved in a similar manner to the insulation of the sub-connecting tube 112.

[0213] Example 5

[0214] The energy storage device in the embodiment is similar to the energy storage devices in Embodiments 1 to 4, except that, as shown in Figures 27 to 29 The heat treatment unit 4 in the embodiment further comprises a radiator 42 and a control valve 43; the inlet of the temperature controller 41 is connected with the liquid outlet pipeline assembly 34, and the outlet of the temperature controller 41 is connected with the liquid supply pipeline assembly 33, for heating or cooling the insulation heat exchange medium; the control valve 43 is used to control whether the insulation heat exchange medium enters the radiator 42, and the inlet and outlet of the radiator 42 are both connected with the liquid outlet pipeline assembly 34, for radiating the insulation heat exchange medium.

[0215] The device for radiating the insulation heat exchange medium by the radiator 42 can specifically adopt a radiator coil and the like, and exchanges heat with the external environment to reduce the temperature of the insulation heat exchange medium.

[0216] The control valve 43 can specifically adopt valves with different control modes or structures, as long as it can control the on-off of the insulation heat exchange medium, for example, a pneumatic valve, an electric valve, a hydraulic valve, etc. For convenient control, an electric valve is preferred, which is convenient to control and easy to operate and install on site. The control valve 43 in the embodiment comprises a three-way electric valve, the first port of the three-way electric valve is in communication with the inlet of the temperature controller 41, the second port is in communication with the liquid outlet pipeline assembly 34, and the third port is in communication with the outlet of the radiator 42. When a three-way electric valve is adopted for control, only a single device is needed to achieve control, and the structure is simple and easy to install.

[0217] In the embodiment, a fan is further arranged outside the radiator 42, which further radiates the insulation heat exchange medium in the radiator 42. The battery module 1 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, so the fan is arranged, so that even in the case of high temperature of 40℃, the temperature of the battery module 1 can be controlled below 50℃. The control of the temperature of the battery module 1 is mainly an energy consumption problem, and the use of air conditioning and other refrigeration equipment has high energy consumption, so the ambient temperature is utilized as much as possible to control the temperature of the battery module 1.

[0218] The working modes of the temperature control system are as follows:

[0219] The first mode is the radiator 42 alone cooling mode.

[0220] As shown in Figure 28As shown, when the battery module 1 temperature reaches the first high temperature threshold, the first port and the third port of the three-way electric valve are communicated, the second port is closed, the heat exchange device exchanges heat with the battery module 1, then the heat exchange device enters the radiator 42 through the liquid outlet pipeline assembly 34, the radiator 42 processes the heat in the heat exchange medium, then the temperature-reduced heat exchange medium enters the temperature control machine 41, at this time, the temperature control machine 41 does not work, only to ensure the passage of the heat exchange medium, then the heat exchange medium returns to the heat exchange device through the liquid supply pipeline assembly 33, and exchanges heat with the battery module 1 again, so as to realize passive cooling through the radiator 42.

[0221] Second, the temperature control machine 41 alone cooling and heating mode:

[0222] As shown, Figure 29 when the battery module 1 temperature reaches the second high temperature threshold, the first port and the second port of the three-way electric valve are communicated, the third port is closed, the heat exchange device exchanges heat with the battery module 1, then the heat exchange device enters the temperature control machine 41 through the liquid outlet pipeline assembly 34, at this time, the temperature control machine 41 works, actively cools the heat exchange medium, then the cooled heat exchange medium returns to the heat exchange device through the liquid supply pipeline assembly 33, and exchanges heat with the battery module 1, so as to realize active cooling through the temperature control machine 41.

[0223] When the battery module 1 temperature reaches the low temperature threshold, the first port and the second port of the three-way electric valve are communicated, the third port is closed, the temperature control machine 41 works, and the heat exchange medium in the temperature control pipe is heated, then the heated heat exchange medium returns to the heat exchange device through the liquid supply pipeline assembly 33, and exchanges heat with the battery module 1, so as to realize active heating through the temperature control machine 41.

[0224] Third, the radiator 42 and the temperature control machine 41 together cooling mode:

[0225] As shown, Figure 28 when the battery module 1 temperature reaches the third high temperature threshold, the first port and the third port of the three-way electric valve are communicated, the second port is closed, the heat exchange device exchanges heat with the battery module 1, then the heat exchange device enters the radiator 42 through the liquid outlet pipeline assembly 34, the radiator 42 processes the heat in the heat exchange medium, then the temperature-reduced heat exchange medium enters the temperature control machine 41, at this time, the temperature control machine 41 opens to cool the heat exchange medium, then the heat exchange medium returns to the heat exchange device through the liquid supply pipeline assembly 33, and exchanges heat with the battery module 1 again, so as to realize passive cooling and active cooling through the radiator 42 and the temperature control machine 41.

[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 4 combines active cooling, active heating and passive cooling of the battery module 1 through the radiator 42 and the temperature control machine 41. This mode can ensure that the heat of the battery module 1 can be effectively treated, the temperature control cost is small, the energy can be effectively saved, the waste of energy when only active temperature control is used is avoided, and the defect that the temperature of the battery module 1 cannot be controlled in time when only passive temperature control is used is avoided. The setting makes the heat treatment unit 4 fully exchange heat with the external environment, fully utilizes the temperature of the external environment, thereby saves the opening time of active refrigeration, and saves energy.

Claims

1. An energy storage device, characterized by, The battery cluster comprises at least one battery module, and the battery module comprises a battery pack and a pressure-bearing shell. The pressure-bearing shell is a closed pressure shell, and the pressure-bearing shell has a blast venting channel covering the blast venting part of each single battery. The top plate of the pressure-bearing shell has a first avoiding hole corresponding to the polarity terminal of each single battery. The top of the pressure-bearing shell is provided with a heat exchange device, and the heat exchange device is insulated from the pressure-bearing shell and each single battery. The heat exchange device has a heat exchange channel through which an insulating heat exchange medium passes, and the insulating heat exchange medium in the heat exchange channel directly contacts the polarity terminal of each single battery for heat exchange.

2. The energy storage device of claim 1, wherein, The heat exchange device is a hollow box with an open end, and the open end of the hollow box is sealingly fixed to the top plate of the pressure-bearing shell.

3. The energy storage device of claim 1, wherein, The heat exchange device comprises a connecting pipe assembly, and each single battery has a channel through the polarity terminal.

4. The energy storage device of claim 1, wherein, The heat exchange device comprises at least one heat exchange plate, and the heat exchange plate has a first channel extending in the x direction and at least one group of second channels arranged in the x direction.

5. The energy storage device according to any one of claims 1 to 4, wherein The pressure-bearing shell comprises a cylinder with at least one open end at the top or bottom and a top plate sealing the open end of the cylinder top and a bottom plate sealing the open end of the cylinder bottom.

6. The energy storage device of claim 5, wherein, The upper part of the pressure-bearing shell is provided with an insulating sealing adhesive layer, and the main part of the heat exchange device is located in the insulating sealing adhesive layer.

7. The energy storage device according to any one of claims 1 to 4, wherein The battery cluster comprises a plurality of battery module units arranged in the vertical direction, and each battery module unit comprises a plurality of battery modules arranged in the horizontal direction. The heat delivery 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 for delivering the insulation heat exchange medium in the heat treatment unit to each battery cluster; and the liquid outlet pipeline assembly is used for collecting the insulation heat exchange medium after heat exchange with each battery cluster to the heat treatment unit; The number of the liquid inlet pipeline assembly and the liquid return pipeline assembly corresponds to the number of the battery cluster; in each battery cluster, the liquid inlet pipeline assembly is used for distributing the insulation heat exchange medium in the liquid supply pipeline assembly to the heat exchange device of each battery module; and the liquid return pipeline assembly is used for collecting the insulation heat exchange medium after heat exchange of the plurality of battery modules to the liquid outlet pipeline assembly.

8. The energy storage device of claim 7, wherein, The liquid inlet pipeline assembly comprises a first-stage liquid inlet pipe, a second-stage liquid inlet pipe and a third-stage liquid inlet pipe; the liquid inlet port of the first-stage liquid inlet pipe is used for connecting with the liquid supply pipeline assembly; the plurality of second-stage liquid inlet pipes are connected with the first-stage liquid inlet pipe, and the plurality of second-stage liquid inlet pipes distribute the insulation heat exchange medium in the first-stage liquid inlet pipe to the plurality of battery module units; the plurality of third-stage liquid inlet pipes are connected with the second-stage liquid inlet pipe, and the plurality of third-stage liquid inlet pipes distribute the insulation heat exchange medium in the second-stage liquid inlet pipe to the heat exchange device of the plurality of battery modules; the liquid return pipeline assembly comprises a first-stage liquid outlet pipe, a second-stage liquid outlet pipe and a third-stage liquid outlet pipe; the plurality of third-stage liquid outlet pipes are connected with the second-stage liquid outlet pipe, and are used for collecting the insulation heat exchange medium after heat exchange with the battery modules to the second-stage liquid outlet pipe; each second-stage liquid outlet pipe is connected with the first-stage liquid outlet pipe, and collects the insulation heat exchange medium after heat exchange with the plurality of battery module units to the first-stage liquid outlet pipe; and the first-stage liquid outlet pipe is connected with the liquid outlet pipeline assembly.

9. The energy storage device of claim 7, wherein, The battery clusters are a plurality of and arranged in a matrix form; The liquid supply pipeline assembly comprises a first-stage distribution pipe, a second-stage distribution pipe and a third-stage distribution pipe; the inlet of the first-stage distribution pipe is used for connecting with the heat treatment unit; the second-stage distribution pipe is used for distributing the insulation heat exchange medium in the first-stage distribution pipe to different column or different row battery clusters; and the third-stage distribution pipe is used for distributing the insulation heat exchange medium in the second-stage distribution pipe to the plurality of battery clusters in the same column or the same row; the liquid outlet pipeline assembly comprises a first-stage combination pipe, a second-stage combination pipe and a third-stage combination pipe; the third-stage combination pipe is used for collecting the insulation heat exchange medium of the plurality of battery clusters in the same column or the same row to the second-stage combination pipe; the second-stage distribution pipe is used for collecting the insulation heat exchange medium of the different column or different row battery clusters to the first-stage combination pipe; and the outlet of the first-stage combination pipe is used for connecting with the heat treatment unit.

10. The energy storage device of claim 8, 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 second-stage liquid outlet pipe is connected with the first-stage liquid outlet pipe by using a quick plug connector and a hose; in the battery clusters in the same row, adjacent two battery clusters share one first-stage liquid outlet pipe; meanwhile, the second-stage liquid inlet pipe and the second-stage liquid outlet pipe are spliced by using a plurality of section pipes.

11. The energy storage device of claim 9, wherein, A water supplement connector is arranged on the first-stage distribution pipe, and is used for supplementing the insulation heat exchange medium for the temperature control system; and an exhaust valve is arranged on the first-stage combination pipe.

12. The energy storage device according to any one of claims 1 to 4, wherein The heat treatment unit comprises a temperature control machine, an inlet of the temperature control machine is connected with the liquid outlet pipeline assembly, an outlet of the temperature control machine is connected with the liquid supply pipeline assembly, the temperature control machine is used for heating or cooling the insulation heat exchange medium, and a blocking joint is arranged on the inlet and the outlet of the temperature control machine, and the blocking joint can block the insulation heat exchange medium in the temperature control machine.

13. The energy storage device of claim 12, wherein, The heat treatment unit further comprises a radiator and a control valve, the control valve is used for controlling whether the insulation heat exchange medium enters the radiator, the inlet and the outlet of the radiator are connected with the liquid outlet pipeline assembly, and the radiator is used for radiating the insulation heat exchange medium.

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