Novel battery pack and energy storage system thereof

Abstract

The utility model discloses a novel battery pack and an energy storage system thereof. The novel battery pack comprises a tubular structure shell, a battery cell, a battery module, a refrigerant and an end cover which are integrally formed, an end cover provided with a positive / negative electrode connector is fixedly connected with a flange of the shell through a bolt, the shell provided with the battery module is sealed relative to the outside, a refrigerant is arranged in an inner cavity of the shell, and at least part or all of the battery module is soaked in the refrigerant; in addition, an integral flange with a plurality of holes can also be used, and a plurality of shells share one porous integral flange to present a tubular form, so that the scheme not only has a simple structure, but also has a relatively high grouping volume utilization rate, and particularly has good heat conduction performance of a refrigerant, so that the heat management efficiency of the battery PACK is high, the heat management effect is good, and the service life of the battery PACK is prolonged. The cycle life of the battery cell is prolonged; and meanwhile, the refrigerant has excellent insulation and arc extinguishing capabilities, so that the safety of the battery pack is improved, and a battery energy storage system consisting of the novel battery pack does not need to be provided with a fire extinguishing system.

Description

Technical Field

[0001] The technical field involved in this patent is a new type of battery pack and its energy storage system that combines battery grouping technology and battery thermal management technology. Background Art

[0002] In the field of lithium-ion battery technology, the grouping, thermal management, and fire protection of battery cells have always been an important research direction. The traditional thermal management cooling method of battery packs is mainly through air cooling or liquid cooling plate conduction cooling, but these cooling methods have problems such as low efficiency and poor effect. At present, whether it is new energy vehicles or energy storage systems of various specifications, safety accidents occur frequently, and energy storage systems urgently need a direct and effective fire protection method to quickly extinguish fires in battery modules that have caught fire. Researchers have been looking for a new high-efficiency thermal management technology, that is, a new cooling method that can efficiently cool battery modules and at the same time have fast and direct fire protection functions.

[0003] Therefore, developing a new battery pack to alleviate or solve the above problems, improve the cooling efficiency and effect of the new battery pack, reduce the volume and weight of the battery pack, and reduce the losses caused by battery system safety accidents is an important research direction in the current battery technology field. Utility Model Content

[0004] In view of the deficiencies and problems of the prior art, the technical problem to be solved by the present invention is to provide a new type of battery pack. By improving the battery grouping structure and the cooling method, not only the efficiency of heat exchange and heat transfer of the battery pack is improved, but also the volume energy density of the battery pack is improved; at the same time, the safety of the battery pack is further improved.

[0005] A new battery pack, comprising:

[0006] The housing comprises an integrally formed or welded tubular body with an opening at at least one end, a flange is welded to the open end of the tubular body, and a plurality of bolt holes or threaded holes or threaded sleeves are arranged on the flange;

[0007] The battery module is formed by connecting several battery cells in parallel or in series with conductive metal parts, and the battery module includes a BMS harness; and the battery module has a total positive terminal, a total negative terminal, and a BMS harness multi-core plug; the battery module is installed in the inner cavity of the tubular body;

[0008] An end cover is provided with a plurality of bolt holes, which are connected and fixed with the flange by bolts, so that the end cover, the flange and the shell are connected, and a seal is provided on the end cover or the shell so that the inner cavity of the tubular body is sealed from the outside; the end cover is also provided with a positive connector socket, a negative connector socket and a BMS (full name: battery management system) data communication signal line socket with sealing ability; the positive connector socket is connected to the total positive terminal of the battery module through a copper busbar, the negative connector socket is connected to the total negative terminal of the battery module through a copper busbar, and the BMS data communication signal line socket is connected to the BMS wiring harness multi-core plug of the battery module;

[0009] The refrigerant is a liquid with insulating, arc-extinguishing, heat-conducting and flame-retardant properties. The refrigerant is introduced into the inner cavity of the tubular body, and the battery module is at least partially immersed in the refrigerant.

[0010] The battery module is electrically connected to the positive / negative connector sockets on the end cover via the copper busbar.

[0011] The shell of the new battery pack is a tubular structure shell that is integrally formed or welded, has a simple structure and high production efficiency, reduces production costs and improves production efficiency.

[0012] The shell can be made of polymer insulating material or metal material, among which aluminum profile is the best choice, because aluminum profile has high production efficiency and strong heat dissipation capacity, and also has the advantage of high mechanical strength performance.

[0013] Refrigerants can include transformer oil and silicone oil, or even fluorine-containing special coolant; transformer oil is a mineral oil, a product obtained by distillation and refining of natural petroleum. It is a light yellow transparent liquid with low viscosity, good insulation and cooling properties, and its freezing point can reach -40℃.

[0014] Silicone oil is a linear polysiloxane product that remains in liquid state at room temperature. It is a non-volatile viscous liquid, mainly composed of silicone oil and thermal conductive particles. Silicone oil has a very small vapor pressure, a high flash point and ignition point, and a low freezing point. It can be used for a long time in the temperature range of -50℃-+180℃.

[0015] The shell of the battery pack includes at least a square tube structure, as well as a flange and an end cover of the port. When the battery cell is partially or completely immersed in the refrigerant, the heat of the battery cell can be effectively conducted, thereby lowering the temperature of the battery cell, reducing the temperature difference between the battery cells, and improving the thermal management efficiency.

[0016] In one embodiment of the present invention, the interior of the housing is a single chamber, and one or more battery modules insulated from each other are installed in the chamber.

[0017] In one embodiment of the present invention, the interior of the housing includes a plurality of chambers, and the chambers are divided; wherein one or more battery modules insulated from each other are installed in each of the divided chambers.

[0018] In one embodiment of the utility model, the shell flange is an integral flange with multiple holes, several shells share one porous integral flange, and after the several shells and the porous integral flange are assembled and welded, they present a tube-in-tube shape.

[0019] In one embodiment of the utility model, a liquid inlet is provided on the shell or the end cover, and the refrigerant is introduced through the liquid inlet, so that the battery module is at least partially immersed in the refrigerant.

[0020] In one embodiment of the utility model, a liquid outlet is provided on the shell or the end cover, and the refrigerant is led out through the liquid outlet.

[0021] The shell or the end cover is provided with a refrigerant inlet and outlet to facilitate the circulation of the refrigerant in the shell of the battery pack. The refrigerant circulation method can be to directly circulate the soaked refrigerant or to directly set a heat pipe in the shell.

[0022] In one embodiment of the utility model, the refrigerant is connected to the refrigerant storage container through a liquid inlet, a liquid outlet, and an external circulation pipeline system, and the refrigerant circulation is driven by a refrigerant circulation pump to realize heat exchange with an external refrigeration or heating unit.

[0023] The refrigerant in the shell can flow to the cooling or heating unit, and at the same time discharge the heat of the battery pack through the heat dissipation device, thereby improving the heat dissipation / heating efficiency.

[0024] In one embodiment of the utility model, a drain port is provided at the lowest position of the shell or the end cover, and the refrigerant inside the new battery pack is drained through the drain port.

[0025] In one embodiment of the present utility model, the outer surface of the shell is selected from at least one of fins with heat dissipation function and a light plane.

[0026] Providing heat dissipation fins extending in the same direction as the length direction of the battery pack shell can enable the battery pack shell to have a certain passive heat dissipation capability, further improving the overall heat dissipation performance.

[0027] In one embodiment of the present invention, the refrigerant includes silicone oil, transformer oil and fluoropolyether heat transfer fluid.

[0028] In one embodiment of the present invention, the BMS wiring harness is selected from a wiring harness consisting of a plurality of wires, a wiring harness and a flexible printed circuit board harness.

[0029] The utility model also includes an energy storage system, which includes a fire-fighting liquid storage container. The new battery pack is connected to the fire-fighting liquid storage container through an automatic valve, a refrigerant circulation pump, and a refrigerant circulation pipeline system to form a fire-fighting system. The automatic valve switches the refrigerant storage container and the fire-fighting liquid storage container.

[0030] In one embodiment of the present utility model, the battery cell is a soft-pack battery cell, the tab seat is provided with a groove, and the tab connection row is provided in the groove.

[0031] The tab seat is made of a material with good insulation ability, and has a long narrow hole on the tab seat, so that the tab of the battery cell can pass through smoothly. The tab connection bar is also provided with a long narrow hole, so that the tab of the battery cell can pass through smoothly. The tab of the battery cell can pass through the tab seat and the tab connection bar smoothly at the same time, so that the tab can be welded to the tab connection bar.

[0032] The depth of the groove on the tab seat is greater than the thickness of the tab connection row, and the surface area of ​​the tab seat is greater than the groove of the tab seat, so that the tab connection row can be embedded in the tab seat, further improving the grouping efficiency and reducing the volume occupied.

[0033] In the embodiment of the best structure, the combination of the tab seat with the groove and the tab connection row makes the tab area of ​​the battery cell flush as a whole, greatly improving the space utilization rate, which is beneficial to improving the energy density of the battery pack.

[0034] In one embodiment of the present invention, the battery cell may be a square shell battery cell or a cylindrical battery cell.

[0035] The liquid-cooled battery pack provided by the utility model has the following advantages: (1) the shell structure is simple and the production efficiency is high; (2) the combination of the pole ear seat with grooves and the pole ear connecting row makes the pole ear part of the battery cell flush as a whole, and the space utilization rate is high; (3) the battery cell is immersed in a special refrigerant, which has a good heat dissipation effect and can effectively prevent combustion safety accidents caused by DC arcing, thereby improving safety; (4) the circulating refrigerant effectively improves the thermal management efficiency and effect of the battery pack, reduces the temperature of the battery pack, and at the same time reduces the temperature difference between the battery cells, thereby extending the service life of the battery cells; (5) the sealing design of the liquid-cooled battery pack effectively prevents the influence of the external environment on the battery pack, improves the battery pack's resistance to humidity, salt spray, dust, interference and adaptability, so that it can maintain good working performance and safety in various environments; (6) several tubular shells are combined into a tube-in-tube type, which further improves the space utilization rate and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural schematic diagram of a novel battery pack disclosed in the utility model;

[0038] Figure 2 It is a structural schematic diagram of another novel battery pack disclosed in the utility model;

[0039] Figure 3 It is a structural schematic diagram of a pole lug seat disclosed in the utility model;

[0040] Figure 4 It is a structural schematic diagram of another novel battery pack disclosed in the utility model;

[0041] Figure 5 It is a structural schematic diagram of another novel battery pack disclosed in the utility model;

[0042] Figure 6 It is a structural schematic diagram of another novel battery pack disclosed in the utility model;

[0043] Figure 7 It is a schematic diagram of the battery module structure of another novel battery pack disclosed in the utility model;

[0044] Figure 8 This is a schematic diagram of the battery module structure of another new type of battery pack disclosed in the utility model

[0045] Fig. 9 It is a schematic diagram of an energy storage system disclosed in the utility model;

[0046] Among them, 100. Shell, 110. Tubular body, 120. Flange, 121. Inner cavity, 122. Heat dissipation fins, 200. Battery cell, 220 Tab seat, 221 Tab connection row, 300. End cover, 310. Positive connector socket, 320. Negative connector socket, 330. Liquid inlet, 340. Liquid outlet, 350. Drain, 360. BMS data communication signal line socket, 400. Fire liquid storage container, 500 Refrigerant storage container, 600. Automatic valve, 700. Refrigerant circulation pump, 710. Refrigerant circulation pipeline system, 720. Refrigeration or heating unit. DETAILED DESCRIPTION

[0047] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0049] In the present invention, unless otherwise stated, directional words such as "upper, lower, top, bottom" are usually used in relation to the directions shown in the drawings, or in relation to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description,

[0050] "Inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present utility model.

[0051] Embodiment 1:

[0052] like Figure 1-4 As shown, a new battery pack includes:

[0053] The housing 100 comprises an integrally formed or welded tubular body 110 with an opening at at least one end, a flange 120 is welded to the open end of the tubular body 110, and a plurality of bolt holes or threaded holes or threaded sleeves (not shown in the drawings) are arranged on the flange 120;

[0054] The battery module is formed by connecting several battery cells 200 in parallel or in series with conductive metal parts as required. The battery module includes a BMS harness; and the battery module has a total positive terminal, a total negative terminal, and a BMS harness multi-core plug (not shown in the drawings); the battery module is installed in the inner cavity 121 of the tubular body 110. Figure 8 As shown, in this embodiment, the battery cell 200 is a soft-package battery cell.

[0055] The end cover 300 is provided with a plurality of bolt holes (not shown in the drawings), and is connected and fixed with the flange 120 by bolts, so that the end cover 300, the flange 120 and the housing 100 are connected, and a sealing member is provided on the end cover 300 or the flange 120 so that the inner cavity 121 of the tubular body 110 is sealed from the outside; the end cover 300 is also provided with a positive connector socket 310, a negative connector socket 320, and a BMS data communication signal line socket 360 with sealing ability; the positive connector socket is connected to the total positive terminal through a copper busbar, the negative connector socket is connected to the total negative terminal through a copper busbar, and the BMS data communication signal line socket is connected to the BMS wiring harness multi-core plug (not shown in the drawings);

[0056] The end cover 300 is connected and fixed to the flange 120 by bolts, and the inner cavity 121 of the battery pack tubular body 110 is sealed relative to the outside; the end cover 300 is provided with a positive connector socket 310 and a negative connector socket 320;

[0057] The total positive terminal and the total negative terminal of the battery module are electrically connected to the positive connector socket 310 and the negative connector socket 320 on the end cover 300 through the transfer copper busbar.

[0058] The refrigerant is a liquid with insulating, arc-extinguishing, heat-conducting and flame-retardant properties. The refrigerant is introduced into the inner cavity 121 of the tubular body 110, and the battery module is at least partially immersed in the refrigerant.

[0059] In other embodiments, the material of the shell 100 may be a polymer insulating material or a metal material, among which the solution of using an aluminum profile is a better choice, because the aluminum profile has good processing performance, strong heat dissipation capacity, and the advantage of good rigidity.

[0060] In this embodiment, the refrigerant is transformer oil. In other embodiments, silicone oil or other liquids having insulation capability, being in liquid state at normal temperature and pressure, and being harmless to the atmosphere may also be used as the refrigerant.

[0061] Embodiment 2:

[0062] like Figure 1-4 As shown, a new battery pack includes:

[0063] The housing 100 comprises an integrally formed or welded tubular body 110 with an opening at at least one end, a flange 120 is welded to the open end of the tubular body 110, and a plurality of bolt holes or threaded holes or threaded sleeves (not shown in the drawings) are arranged on the flange 120;

[0064] The battery module is formed by connecting a plurality of battery cells 200 in parallel or in series with conductive metal parts as required, and the battery module includes a BMS harness; and the battery module has a total positive terminal, a total negative terminal, and a BMS harness multi-core plug (not shown in the drawings); the battery module is installed in the inner cavity 121 of the tubular body 110;

[0065] The end cover 300 is provided with a plurality of bolt holes (not shown in the drawings), and is connected and fixed with the flange 120 by bolts, so that the end cover 300, the flange 120 and the housing 100 are connected, and a sealing member is provided on the end cover 300 or the flange 120 so that the inner cavity 121 of the tubular body 110 is sealed from the outside; the end cover 300 is also provided with a positive connector socket 310, a negative connector socket 320, and a BMS data communication signal line socket 360 with sealing ability; the positive connector socket is connected to the total positive terminal through a copper busbar, the negative connector socket is connected to the total negative terminal through a copper busbar, and the BMS data communication signal line socket is connected to the BMS wiring harness multi-core plug (not shown in the drawings);

[0066] The end cover 300 is connected and fixed to the flange 120 by bolts, and the inner cavity 121 of the battery pack tubular body 110 is sealed relative to the outside; the end cover 300 is provided with a positive connector socket 310 and a negative connector socket 320;

[0067] The total positive terminal and the total negative terminal of the battery module are electrically connected to the positive connector socket 310 and the negative connector socket 320 on the end cover 300 through the transfer copper busbar.

[0068] The refrigerant is a liquid with insulating, arc-extinguishing, heat-conducting and flame-retardant properties. The refrigerant is introduced into the inner cavity 121 of the shell 110, and the battery module is at least partially immersed in the refrigerant.

[0069] In other embodiments, the material of the tubular body 110 may be a polymer insulating material or a metal material, among which the solution of using an aluminum profile is a better choice, because the aluminum profile has better processing performance, strong heat dissipation capacity, and the advantage of better rigidity.

[0070] In this embodiment, the refrigerant is silicone oil. In other embodiments, transformer oil and other liquids with insulation ability, in liquid state at normal temperature and pressure, and harmless to the atmosphere can also be used as refrigerants.

[0071] like Figure 2 , Figure 4 As shown, the battery cell in this embodiment is a soft-package battery cell, and further includes a tab seat 220 , on which a groove (not shown) is provided, and a tab connection row 221 is provided in the groove.

[0072] In other embodiments, the battery cell may also be a square shell battery cell.

[0073] The tab seat 220 is made of a material with good insulation ability, and has a long narrow through hole on the tab seat 220, so that the tabs of the battery cell 200 can pass through smoothly. The tab connection bar 221 is also provided with a long narrow through hole, so that the tabs of the battery cell 200 can pass through smoothly. The tabs of the battery cell 200 can pass through the tab connection bar 221 and the tab seat 220 at the same time, so that the tabs can be welded to the tab connection bar 221.

[0074] Example 3

[0075] like Figure 1-4 As shown, a new battery pack includes:

[0076] The metal shell 110 comprises an integrally formed or welded tubular body 110 with an opening at at least one end, a flange 120 is welded to the open end of the tubular body 110, and a plurality of bolt holes or threaded holes or threaded sleeves (not shown in the drawings) are arranged on the flange 120;

[0077] The battery module is formed by connecting a plurality of battery cells 200 in parallel or in series with conductive metal parts as required, and the battery module includes a BMS harness; and the battery module has a total positive terminal, a total negative terminal, and a BMS harness multi-core plug (not shown in the drawings); the battery module is installed in the inner cavity 121 of the tubular body 110;

[0078] The end cover 300 is provided with a plurality of bolt holes (not shown in the drawings), and is connected and fixed with the flange 120 by bolts, so that the end cover 300, the flange 120 and the housing 100 are connected, and a sealing member is provided on the end cover 300 or the flange 120 so that the inner cavity 121 of the tubular body 110 is sealed from the outside; the end cover 300 is also provided with a positive connector socket 310, a negative connector socket 320, and a BMS data communication signal line socket 360 with sealing ability; the positive connector socket is connected to the total positive terminal through a copper busbar, the negative connector socket is connected to the total negative terminal through a copper busbar, and the BMS data communication signal line socket is connected to the BMS wiring harness multi-core plug (not shown in the drawings);

[0079] The end cover 300 is connected and fixed to the flange 120 by bolts, and the inner cavity 121 of the battery pack tubular body 110 is sealed relative to the outside; the end cover 300 is provided with a positive connector socket 310 and a negative connector socket 320;

[0080] The total positive terminal and the total negative terminal of the battery module are electrically connected to the positive connector socket 310 and the negative connector socket 320 on the end cover 300 through the transfer copper busbar.

[0081] The refrigerant is a liquid with insulation, arc extinguishing, heat conduction and flame retardancy. The refrigerant is introduced into the inner cavity of the housing 100, and the battery module is at least partially immersed in the refrigerant. In this embodiment, the refrigerant is transformer oil.

[0082] A drain port 350 is provided at the lowest position of the shell or the end cover, and the refrigerant inside the novel battery pack is drained through the drain port 350 .

[0083] like Figure 7 As shown, in this embodiment, the battery cell 200 is a square shell battery cell, and the battery cells 200 can be connected by copper busbars (not shown in the drawings).

[0084] The total positive terminal and the total negative terminal of the battery module are electrically connected to the positive connector socket 310 and the negative connector socket 320 on the end cover 300 through the transfer copper busbar.

[0085] Example 4

[0086] like Figure 1-4 As shown, a new battery pack includes:

[0087] The aluminum profile housing 100 comprises an integrally formed or welded tubular body 110 with an opening at at least one end, a flange 120 is welded to the open end of the tubular body 110, and a plurality of bolt holes or threaded holes or threaded sleeves (not shown in the drawings) are arranged on the flange 120;

[0088] The battery module is formed by connecting a plurality of battery cells 200 in parallel or in series with conductive metal parts as required, and the battery module includes a BMS harness; and the battery module has a total positive terminal, a total negative terminal, and a BMS harness multi-core plug (not shown in the drawings); the battery module is installed in the inner cavity 121 of the tubular body 110;

[0089] The end cover 300 is provided with a plurality of bolt holes (not shown in the drawings), and is connected and fixed with the flange 120 by bolts, so that the end cover 300, the flange 120 and the housing 100 are connected, and a sealing member is provided on the end cover 300 or the flange 120 so that the inner cavity 121 of the tubular body 110 is sealed from the outside; the end cover 300 is also provided with a positive connector socket 310, a negative connector socket 320, and a BMS data communication signal line socket 360 with sealing ability; the positive connector socket 310 is connected to the total positive terminal through a copper busbar, the negative connector socket 320 is connected to the total negative terminal through a copper busbar, and the BMS data communication signal line socket 360 is connected to the BMS wiring harness multi-core plug (not shown in the drawings);

[0090] The end cover 300 is connected and fixed to the flange 120 by bolts, and the inner cavity 121 of the battery pack tubular body 110 is sealed relative to the outside; the end cover 300 is provided with a positive connector socket 310 and a negative connector socket 320;

[0091] The total positive terminal and the total negative terminal of the battery module are electrically connected to the positive connector socket 310 and the negative connector socket 320 on the end cover 300 through the transfer copper busbar.

[0092] The battery end cover 300 is provided with a liquid inlet 330 , through which refrigerant is introduced, so that the battery module in the battery pack housing 100 is immersed in the refrigerant.

[0093] The shell 100 of the battery pack includes at least a square tube structure with an opening at one end and a flange 120 welded thereto, and also includes a square structure with openings at both ends and flanges welded thereto; the flange 120 is connected and fixed to the end cover 300 by bolts. The liquid inlet 330 or the liquid outlet 340 can be provided at the end of the square tubular body without an opening, or can be provided on the end cover 300, in order to introduce the refrigerant through the liquid inlet 330, and the refrigerant can be sealed after the refrigerant is introduced. After partially or even completely immersing the battery module in the refrigerant, the heat generated by the battery module during operation can be effectively conducted, thereby reducing the temperature of the battery module, improving the thermal management efficiency and effect of the battery module, and extending the service life of the battery cell.

[0094] like Figure 6 As shown, the flange 120 in this embodiment is an integral flange with 6 holes, the sizes of the 6 holes match the outer dimensions of the tubular body 110, and the four sides of the 6 holes are welded to the ports of the 6 tubular bodies 110 respectively, presenting a tube-in-tube shape, further reducing the space waste between the flanges 120 and the flanges 120 of adjacent liquid-cooled battery packs during the stacking of separate liquid-cooled battery packs.

[0095] Example 5

[0096] like Fig. 9 As shown, this embodiment includes an energy storage system, including a new battery pack of any one of the above embodiments 1-4, wherein the new battery pack is connected to a refrigerant storage container 500 through an automatic valve 600, a refrigerant circulation pump 700, a refrigeration or heating unit 720, and a refrigerant circulation pipeline system 710 to form a refrigerant circulation system, which efficiently and effectively realizes thermal management of the battery pack, reduces the temperature of the battery cells, and also reduces the temperature difference between the battery cells.

[0097] When an abnormal situation occurs in the battery module and fire extinguishing is required, the fire-fighting liquid is introduced into the inner cavity 121 of the tubular body 110 of the battery pack through a circulation pump, and the battery module is immersed in the fire-fighting liquid, thereby quickly achieving the purpose of fire-fighting.

[0098] The automatic valve 600 automatically switches between the refrigerant storage container 500 and the fire-fighting liquid storage container 400 .

[0099] Obviously, the above described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the utility model.

Claims

1. A new type of battery pack, characterized in that: include, The housing comprises an integrally formed or welded tubular body with an opening at at least one end, a flange is welded to the open end of the tubular body, and a plurality of bolt holes or threaded holes or threaded sleeves are arranged on the flange; The battery module is formed by connecting several battery cells in parallel or in series with conductive metal parts, and the battery module includes a BMS harness; and the battery module has a total positive terminal, a total negative terminal, and a BMS harness multi-core plug; the battery module is installed in the inner cavity of the tubular body; An end cover is provided with a plurality of bolt holes, which are connected and fixed with the flange by bolts, so that the end cover, the flange and the shell are connected, and a seal is provided on the end cover or the shell so that the inner cavity of the tubular body is sealed from the outside; the end cover is also provided with a positive connector socket, a negative connector socket and a BMS data communication signal line socket with sealing ability; the positive connector socket is connected to the total positive terminal of the battery module through a copper busbar, the negative connector socket is connected to the total negative terminal of the battery module through a copper busbar, and the BMS data communication signal line socket is connected to the BMS wiring harness multi-core plug of the battery module; The refrigerant is a liquid with insulating, arc-extinguishing, heat-conducting and flame-retardant properties. The refrigerant is introduced into the inner cavity of the tubular body, and the battery module is at least partially immersed in the refrigerant.

2. The novel battery pack as claimed in claim 1, characterized in that: The interior of the housing is a single chamber, in which one or more battery modules insulated from each other are installed.

3. The novel battery pack as claimed in claim 1, characterized in that: The interior of the housing includes a plurality of chambers, and the chambers are divided; wherein one or more battery modules insulated from each other are installed in each of the divided chambers.

4. The novel battery pack as claimed in claim 1, characterized in that: The shell flange is an integral flange with multiple holes. Several shells share one multi-hole integral flange. After the several shells and the multi-hole integral flange are assembled and welded, a tube-in-tube structure is presented.

5. The novel battery pack according to any one of claims 1 to 4, characterized in that: The shell or the end cover is provided with a liquid inlet, and the refrigerant is introduced through the liquid inlet so that the battery module is at least partially immersed in the refrigerant.

6. The novel battery pack according to any one of claims 1 to 4, characterized in that: The shell or the end cover is provided with a liquid outlet, through which the refrigerant is led out.

7. The novel battery pack according to any one of claims 1 to 4, characterized in that: The refrigerant is connected to the refrigerant storage container through a liquid inlet, a liquid outlet, and an external circulation pipeline system, and is driven by a refrigerant circulation pump to realize refrigerant circulation and heat exchange with an external refrigeration or heating unit.

8. The novel battery pack according to any one of claims 1 to 4, characterized in that: A drain port is provided at the lowest position of the shell or the end cover, through which the refrigerant inside the new battery pack is discharged; and the outer surface of the shell is selected from at least one of a fin with heat dissipation function and a smooth plane.

9. The novel battery pack according to any one of claims 1 to 4, characterized in that: The BMS wiring harness is selected from a wiring harness consisting of a plurality of electric wires, a wiring harness and a flexible printed circuit board wiring harness.

10. An energy storage system, comprising the novel battery pack according to any one of claims 1 to 9, characterized in that: It also includes a fire-fighting fluid storage container and a refrigerant storage container. The new battery pack is connected to the fire-fighting fluid storage container through an automatic valve, a refrigerant circulation pump, and a refrigerant circulation pipeline system to form a fire-fighting system. The automatic valve switches the refrigerant storage container and the fire-fighting fluid storage container.

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