Fully-immersed energy storage battery pack

Abstract

A full-immersed energy storage battery pack belongs to the technical field of batteries and comprises a lower box body, an upper box cover and a plurality of battery modules, the lower box body is detachably connected with the upper box cover, immersion liquid is filled in the lower box body, the battery modules are completely immersed in the immersion liquid, the lower box body comprises a bottom plate, a liquid cooling flow channel is arranged in the bottom plate, and the liquid cooling flow channel is communicated with the liquid cooling flow channel. The liquid cooling flow channel is used for circulating flow of cooling liquid, the liquid cooling flow channel is directly integrated in the bottom plate, an independent liquid cooling plate does not need to be additionally installed, the internal structure of the box body is simplified, the space utilization rate is increased, and the overall size of the box body is reduced; meanwhile, the liquid cooling flow channel and the bottom plate are integrally designed, so that the sealing link between the liquid cooling plate and the box body is reduced, the immersion liquid leakage risk is reduced, and the assembly process of the box body is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a full-immersion energy storage battery pack. BACKGROUND

[0002] With the rapid development of the energy storage industry, lithium ion battery energy storage technology occupies a dominant position. Due to the influence of battery heat dissipation, the battery cells are prone to thermal runaway, which leads to frequent fires in various energy storage power stations caused by battery thermal runaway.

[0003] Currently, in order to solve the problem of heat dissipation, the battery cells and other connecting parts are usually immersed in immersion liquid as a whole to increase the contact area between the battery cells and the heat sink, greatly improving the heat dissipation efficiency and temperature uniformity of the battery cells. According to whether the immersion liquid flows, it is usually divided into two types of dynamic immersion and static immersion. In order to further improve the heat dissipation efficiency, a combined cooling structure combining dynamic and static has appeared, which realizes multi-stage heat dissipation and strengthens the heat dissipation effect.

[0004] However, the existing combined cooling structure needs to set a liquid cooling plate in the box (bottom), which leads to a complex internal structure of the box, low space utilization, and increases the overall volume of the box. In addition, due to the strong permeability of the immersion liquid, the liquid cooling plate and the box need to be sealed, otherwise the immersion liquid is prone to leakage, increasing the assembly difficulty of the box. SUMMARY

[0005] In order to solve the technical problems of the existing battery pack combined cooling structure in the background art, which needs to set a liquid cooling plate in the box, the overall structure is complex, and the sealing ability is poor, the present application provides a full-immersion energy storage battery pack.

[0006] The technical scheme of the present application is as follows: The present application provides a full-immersion energy storage battery pack, which comprises a lower box, an upper box cover and a plurality of battery modules. The lower box and the upper box cover are detachably connected. The lower box is internally provided with immersion liquid. The battery modules are completely immersed in the immersion liquid. The lower box comprises a bottom plate, and the bottom plate is internally provided with a liquid cooling flow channel. The liquid cooling flow channel is used for the circulation flow of the cooling liquid. The liquid cooling flow channel is directly integrated in the interior of the bottom plate, without the need for additional installation of an independent liquid cooling plate, thereby simplifying the internal structure of the box, improving the space utilization, and reducing the overall volume of the box. At the same time, the liquid cooling flow channel is designed in an integrated manner with the bottom plate, reducing the sealing link between the liquid cooling plate and the box, reducing the risk of immersion liquid leakage, and simplifying the assembly process of the box.

[0007] Preferably, the lower box body further comprises a side plate, a front plate and a rear plate, the side plate is an L-shaped plate, the side plate comprises a horizontal section and a vertical section, the horizontal section of the side plate is fixedly connected with the bottom plate, the liquid cooling flow channel is arranged in the horizontal section of the side plate and the bottom plate, and flow channel sealing strips are fixedly arranged at both ends of the horizontal section of the side plate and the bottom plate, so that the liquid cooling flow channel is extended to the horizontal section of the side plate, the contact area of the cooling liquid with the box body is increased, and the heat dissipation efficiency is improved; the sealing performance of the liquid cooling flow channel is further improved by arranging the flow channel sealing strips, the leakage of the cooling liquid is avoided, the heat dissipation effect is affected, meanwhile, the immersion liquid is prevented from seeping into the flow channel, and the stable operation of the heat dissipation system is ensured.

[0008] Preferably, a through hole is arranged on the horizontal section of the side plate, the through hole is communicated with the liquid cooling flow channel, and the through hole is connected with an external liquid cooling pipeline through a water nozzle, so that the liquid cooling flow channel and the external liquid cooling pipeline are conveniently connected through the through hole and the water nozzle, the connection structure of the external pipeline is simplified, the assembly difficulty is reduced, and the reliability of the overall structure is improved.

[0009] Preferably, a fixed block is fixedly installed at the front end of the side plate, and a lifting hole is arranged on the side surface of the side plate, so that the battery pack is fixed and lifted.

[0010] Preferably, the bottom of the front plate and the bottom of the rear plate extend towards the inside of the box body as module fixing beams, the module fixing beams provide stable installation support for the battery module, an additional fixing support is not needed, and the internal structure is simplified; a liquid inlet and a liquid outlet are arranged on the front plate, the liquid inlet and the liquid outlet are fixedly connected with the water nozzle, a BMU cover plate is detachably installed on the front plate, a battery management unit is fixedly installed on the BMU cover plate, and the battery management unit is soaked in the immersion liquid; the cooperation of the liquid inlet, the liquid outlet and the water nozzle ensures the smooth circulation of the cooling liquid; the detachable design of the BMU cover plate facilitates the maintenance of the battery management unit, the battery management unit is soaked in the immersion liquid, the cooling capacity of the immersion liquid is utilized to cool the battery management unit, the working stability of the battery management unit is improved, a separate heat dissipation structure does not need to be designed for the battery management unit, and space is saved.

[0011] Preferably, an oil filling port is arranged on the upper box cover, an oil filling port cover plate is arranged at the oil filling port, an air breather valve is fixedly installed on the upper box cover, and a flow guide cover is installed outside the air breather valve, so that the immersion liquid is conveniently added and replaced, the oil filling port cover plate ensures the sealing performance of the box body, the air breather valve can balance the air pressure inside and outside the box body, the internal pressure of the box body is prevented from being too high or too low due to temperature change, and the flow guide cover can inhibit the spattering of the immersion liquid with high-pressure gas, thereby reducing the pollution of the working environment caused by the immersion liquid.

[0012] Preferably, the battery module includes a plurality of battery cells and is bound by a steel band, end plates are arranged between the battery cells and the steel band at both ends of the battery module, and a nitrile rubber strip is arranged between adjacent battery cells, and a bottom insulating sheet is arranged between the bottom of the battery module and the lower box body, the end plates can prevent the steel band from directly contacting the battery cells and prevent damage to the blue film of the battery cells, the nitrile rubber strip has good insulation and buffering performance, reduces the friction and vibration between the battery cells, and facilitates the flow of immersion liquid between the battery cells, thereby improving the uniformity of heat dissipation; the bottom insulating sheet realizes electrical insulation between the battery module and the lower box body, avoids the risk of short circuit, and facilitates the flow of immersion liquid into the gap between the bottom of the battery cells and the lower box body, thereby enhancing the heat dissipation effect of the battery cells.

[0013] Preferably, a wire harness isolation plate is arranged above the battery cells, a plurality of series aluminum bars are embedded in the wire harness isolation plate, and the series aluminum bars are connected in series with all the battery cells of the same battery module; output pole aluminum bars are also embedded at both ends of the wire harness isolation plate, the battery module is connected to the outside through the output pole aluminum bars, the wire harness isolation plate plays a role in isolating and protecting the connection lines of the battery cells, the embedded series aluminum bars and output pole aluminum bars simplify the connection structure between the battery cells and the outside, reduce the space occupied by the lines, and the aluminum bars have good conductivity and heat dissipation, which helps to improve the overall performance and avoid the problems of space waste and heat dissipation obstruction caused by traditional line connection disorder.

[0014] Preferably, a power socket, a communication socket, and an oil sight glass are fixedly installed on the front plate, and H-shaped double sealing rings are arranged between the power socket, the communication socket, and the oil sight glass and the front plate, the H-shaped double sealing rings enhance the sealing between these components and the front plate, effectively prevent immersion liquid from leaking, and the oil sight glass facilitates observation of the liquid level and state of the immersion liquid in the box body without opening the box body, thereby being convenient to operate.

[0015] Preferably, a fuse holder is fixedly arranged on the front plate, and a direct-current fuse is fixedly connected to the fuse holder through a fuse insulating column; the power socket is connected to the total positive of the battery module through a third copper bar, the power socket is connected to the direct-current fuse through a second copper bar, and the direct-current fuse is connected to the total negative of the battery module through a first copper bar, the fuse holder and the fuse insulating column provide a safe and stable mounting structure for the direct-current fuse, and the insulating column ensures electrical safety; the copper bar connection mode has good conductivity and compact structure, reduces the space occupied by the lines, simplifies the circuit connection in the overall design, improves the space utilization and system safety, and avoids the problems of heat dissipation and space caused by complex lines.

[0016] It can be seen from the above technical solutions that the present application has the following advantages: 1. The liquid cooling flow channel is integrated with the bottom plate of the lower box, without the need for additional liquid cooling bottom plate at the bottom of the battery module, effectively reducing the structural complexity of the lower box, without the need to consider the sealing problem between the lower box and the liquid cooling bottom plate, and the setting mode without the liquid cooling bottom plate reduces the overall size of the lower box, improves the space utilization rate, and reduces the use amount of immersion liquid; at the same time, through the dynamic and static combined cooling mode, the heat dissipation efficiency is effectively improved.

[0017] 2. The end plate is arranged between the steel belt and the battery cell at both ends of the battery module, the nitrile rubber strip is arranged between the adjacent battery cells, and the bottom insulation sheet is arranged between the bottom of the battery module and the lower box. The end plate can prevent the steel belt from directly contacting the battery cell and prevent the damage of the battery cell blue film. The nitrile rubber strip has good insulation and buffering performance, reduces the friction and vibration influence between the battery cells, and is beneficial to the flow of the immersion liquid between the battery cells, and improves the heat dissipation uniformity. The bottom insulation sheet realizes the electrical insulation between the battery module and the lower box, avoids the short circuit risk, and facilitates the immersion liquid to flow into the gap between the bottom of the battery cell and the lower box, and enhances the heat dissipation effect of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the present application, the drawings required to be used in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 The structure diagram of the full-immersion energy storage battery pack according to one or more embodiments of the present application; Figure 2 The exploded structure diagram of the lower box according to one or more embodiments of the present application; Figure 3 The schematic diagram of the lower box flow channel according to one or more embodiments of the present application; Figure 4 The structure diagram of the upper box cover according to one or more embodiments of the present application; Figure 5 The structure diagram of the BMU cover plate according to one or more embodiments of the present application; Figure 6 The structure diagram of the battery module according to one or more embodiments of the present application; Figure 7 The structure diagram of the wire harness isolation plate according to one or more embodiments of the present application; Figure 8 The structure diagram of the connector assembly according to one or more embodiments of the present application; Figure 9Structure diagram of the connection row according to one or more embodiments of the present application; The components represented by the reference numerals in the drawings are: 1, lower box body; 101, bottom plate; 102, side plate; 1021, through hole; 103, front plate; 104, rear plate; 105, flow channel sealing strip; 106, flange; 107, water nozzle; 108, fixing block; 109, box cover stop; 110, hoisting hole; 111, liquid inlet; 112, liquid outlet; 113, liquid cooling flow channel; 2, upper box cover; 201, box cover main body; 202, oil filling port cover plate; 203, breather valve; 204, flow guide cover; 3, BMU cover plate; 301, cover plate main body; 302, BMU support; 303, press-in nut; 4, battery module; 401, battery cell; 402, end plate; 403, steel belt; 404, terminal seat; 405, wire harness isolation plate; 406, isolation plate cover plate; 407, output pole aluminum bar; 408, series aluminum bar; 5, connector assembly; 501, power socket; 502, communication socket; 503, oil sight glass; 6, bottom insulating sheet; 7, connection row; 701, first copper row; 702, second copper row; 703, third copper row; 8, fuse assembly; 801, direct current fuse; 802, fuse insulating column; 803, fuse support.

[0020] Noun explanation: The BMU cover plate is a component for covering and protecting the battery management unit (BMU), preventing the BMU from being damaged by external objects, scratches, dust, water vapor, etc., and ensuring the safety and stable operation of the internal circuit and elements. DETAILED DESCRIPTION

[0021] To make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the specific embodiments. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present patent, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present patent.

[0022] Embodiment 1 In a typical embodiment of the present application, a full-immersion energy storage battery pack is proposed, which aims to quickly dissipate heat from lithium ion batteries through immersion liquid, reduce the temperature difference between the upper and lower parts of a single battery cell, and reduce the risk of battery thermal runaway, thereby ensuring the safety of the battery. At the same time, the structural complexity is reduced, the sealing property is ensured, and the problem of immersion liquid leakage is effectively solved.

[0023] As Figures 1-9As shown, the full-immersion energy storage battery pack includes: a lower box 1, an upper box cover 2, a BMU cover plate 3, a battery module 4, a connector assembly 5, a bottom insulating sheet 6, a connection row 7 and a fuse assembly 8, the lower box 1 is an upper opening structure, the upper box cover 2 is detachably installed at the upper opening of the lower box 1 to cover the upper opening of the lower box 1, the BMU cover plate 3 is detachably installed on the lower box 1 for fixed installation of the battery management unit (BMU), the battery module 4 is installed in the lower box 1, the bottom of the battery module 4 is provided with the bottom insulating sheet 6 between the lower box 1, the connector assembly 5 is fixedly installed on the lower box 1, the fuse assembly 8 is fixedly installed inside the lower box 1, and the connection row 7 is used to connect the battery module 4 with the fuse assembly 8 and the connector assembly 5.

[0024] In this embodiment, the lower box 1 is made of aluminum extruded profiles by welding, and the liquid cooling flow channel 113 is arranged in the shell of the lower box 1. The liquid cooling flow channel 113 is generated synchronously in the aluminum extrusion process of the shell of the lower box 1, without the need to additionally provide a liquid cooling bottom plate at the bottom of the battery module 4, effectively reducing the structural complexity of the lower box 1, without the need to consider the sealing problem between the lower box 1 and the liquid cooling bottom plate, and the setting mode without the liquid cooling bottom plate reduces the overall size of the lower box 1, improves the space utilization, and reduces the use amount of the immersion liquid.

[0025] The liquid cooling flow channel 113 integrally formed with the aluminum extruded profile replaces the traditional liquid cooling bottom plate, further simplifying the box structure; at the same time, by machining the end of the aluminum extruded profile, the flow channel with different flow resistance can be flexibly designed, which has higher adjustability compared with the mold forming mode.

[0026] The shell of the lower box 1 is also provided with a liquid inlet 111 and a liquid outlet 112, both of which are connected with the liquid cooling flow channel 113, so that the cooling liquid (such as ethylene glycol) can circulate in the liquid cooling flow channel 113, thereby realizing dynamic cooling; at the same time, the inside of the lower box 1 is also filled with immersion liquid, which is an insulating and non-flammable material, which can block the spread of thermal runaway, so that the battery module 4, the battery management unit and the like are all immersed in the immersion liquid, to realize static cooling, which significantly improves the heat dissipation area of the internal components of the battery pack, helps to improve the uniformity of temperature distribution, thereby reducing the risk of thermal runaway, and through the dynamic and static combined cooling mode, the heat dissipation efficiency is effectively improved.

[0027] As shown in FIG. 1, the full-immersion energy storage battery pack includes: a lower box 1, an upper box cover 2, a BMU cover plate 3, a battery module 4, a connector assembly 5, a bottom insulating sheet 6, a connection row 7 and a fuse assembly 8, the lower box 1 is an upper opening structure, the upper box cover 2 is detachably installed at the upper opening of the lower box 1 to cover the upper opening of the lower box 1, the BMU cover plate 3 is detachably installed on the lower box 1 for fixed installation of the battery management unit (BMU), the battery module 4 is installed in the lower box 1, the bottom of the battery module 4 is provided with the bottom insulating sheet 6 between the lower box 1, the connector assembly 5 is fixedly installed on the lower box 1, the fuse assembly 8 is fixedly installed inside the lower box 1, and the connection row 7 is used to connect the battery module 4 with the fuse assembly 8 and the connector assembly 5. Figure 2As shown, the lower housing 1 includes a bottom plate 101, a side plate 102, a front plate 103, and a rear plate 104. There are two side plates 102. The bottom plate 101, side plate 102, front plate 103, and rear plate 104 are all made of extruded aluminum profiles. The bottom plate 101, side plate 102, front plate 103, and rear plate 104 are welded together. The side plate 102 has an L-shaped structure, including a horizontal section and a vertical section. A liquid cooling channel 113 is disposed within the horizontal section of the side plate 102 and the bottom plate 101. The horizontal section of the side plate 102 and the bottom plate 101 are welded together. Flow channel sealing strips 105 are inserted and welded to both ends of the horizontal section of the side plate 102 and the bottom plate 101 to seal both ends of the liquid cooling channel 113. Figure 3 As shown, the liquid cooling channel 113 is a serpentine channel and is transversely connected. The liquid cooling channel 113 has several sets of channels, and each set of channels contains at least three flow paths. The coolant in the same set of channels flows synchronously and in the same direction to ensure cooling efficiency.

[0028] A through hole 1021 is provided on the horizontal section of the side plate 102. The through hole 1021 is connected to the liquid cooling channel 113, and the through hole 1021 is connected to the adjacent liquid inlet 111 and liquid outlet 112 through the water nozzle 107. The water nozzle 107 has an L-shaped structure and is used to connect to the external liquid cooling pipe to complete the circulation of coolant in the liquid cooling channel 113.

[0029] A fixing block 108 is welded to the front end of the side plate 102 (i.e. the end that is fixedly connected to the front plate 103). The fixing block 108 has fixing holes for fixing the battery pack as a whole. The side of the side plate 102 has lifting holes 110 for lifting the battery pack.

[0030] like Figure 2 As shown, the bottom of both the front plate 103 and the rear plate 104 extends toward the inside of the box to serve as a module fixing beam, reducing the number of parts, eliminating the need for processing and welding of independent module fixing beams, and reducing assembly difficulty; the liquid inlet 111 and the liquid outlet 112 are both located on the front plate 103.

[0031] A flange 106 is welded and fixed at the front plate 103. Several threaded blind holes are provided on the flange 106 for the fixed installation of the BMU cover plate 3. A sealing groove is provided on the inner side of the threaded blind holes for the installation of the sealing ring to ensure the sealing performance of the sealing surface between the flange 106 and the BMU cover plate 3.

[0032] Both the front plate 103 and the rear plate 104 adopt an outward flange design at the upper flange edge, and the rivet nut is fixed on the outward flange, so that the rivet nut is located on the outside of the box wall, eliminating the risk of leakage at the rivet nut; at the same time, the outer edge of the upper flange edge is fixed with a reinforcing rib to reduce the deformation of the flange edge during welding or riveting process, and ensure the flatness of the sealing surface of the upper box edge.

[0033] A cover strip 109 is provided between the lower housing 1 and the upper cover 2 to install a sealing ring on the outer periphery of the cover strip 109, ensuring the sealing performance of the sealing surface between the lower housing 1 and the upper cover 2; at the same time, the height of the cover strip 109 is consistent with the protrusion height of the flange edge rivet nut, which together play the role of controlling the compression of the sealing ring.

[0034] like Figure 4 As shown, the upper cover 2 includes a cover body 201. The surface of the cover body 201 is stamped with reinforcing ribs to improve its overall strength. An oil inlet is opened on the top of the cover body 201 for adding or removing immersion liquid. An oil inlet cover plate 202 is provided above the oil inlet to seal the oil inlet. A vent valve 203 is also fixedly installed on the top of the cover body 201 to discharge the high-pressure gas generated inside the box when the battery cell thermally runs away. At the same time, a guide hood 204 is installed on the outside of the vent valve 203 to suppress the splashing of immersion liquid with high-pressure gas, thereby reducing its pollution to the working environment.

[0035] The BMU cover plate 3 is detachably connected to the flange 106 on the front plate 103 by bolts. The battery management unit (BMU) is installed on the detachable BMU cover plate 3 and immersed in the immersion liquid. Compared with the external BMU method, in this embodiment, only the sealing problem between the BMU cover plate 3 and the lower box 1 needs to be considered, and there is no need to consider how to lead the CCS harness out from the box.

[0036] like Figure 5 As shown, the BMU cover plate 3 includes a cover plate body 301, a BMU bracket 302, and a press-fit nut 303. The BMU bracket 302 is welded and fixed to the inner wall of the cover plate body 301, and the press-fit nut 303 is fixedly installed on the BMU bracket 302 for the fixed installation of the battery management unit.

[0037] like Figure 1As shown, the lower housing 1 contains four battery modules 4 connected in series. Each battery module 4 is secured with a steel strap 403 to a battery cell 401. Both ends of the battery module 4 are protected by end plates 402. The battery module 4 is directly immersed in the immersion liquid without any other protective materials. Multiple nitrile rubber strips are used to separate adjacent battery cells 401 to allow the immersion liquid to flow into the gaps between the battery cells 401. A bottom insulating sheet 6 is used to separate the bottom of the battery module 4 from the lower housing 1, providing insulation and protection while also allowing the immersion liquid to flow into the gaps between the bottom of the battery cell 401 and the lower housing 1, thus enhancing the heat dissipation of the battery cell 401.

[0038] Specifically, such as Figure 6 As shown, the battery module 4 includes several battery cells 401, which are arranged in a staggered pattern and bundled together by steel strips 403. Each end of the battery module 4 has an end plate 402, which is located between the steel strips 403 and the battery cells 401 at the end to prevent the steel strips 403 from directly contacting the battery cells 401 and to prevent damage to the blue film of the battery cells 401.

[0039] Above the battery cell 401, there is also a wire harness isolation plate 405, such as... Figure 7 As shown, the wiring harness isolation plate 405 is embedded with several series aluminum bars 408, so as to connect all the cells 401 of the same battery module 4 in series using the series aluminum bars 408; at the same time, output electrode aluminum bars 407 are also embedded at both ends of the wiring harness isolation plate 405, so as to enable the battery module 4 to conduct to the outside through the output electrode aluminum bars 407.

[0040] like Figure 6 As shown, a terminal block 404 is fixedly provided on the top of the end plate 402. The terminal block 404 is used to fix the output electrode aluminum bar 407 and the connecting bar 7. An isolation plate cover 406 is detachably installed on the top of the wire harness isolation plate 405 to prevent accidental contact during the battery pack production process.

[0041] The connector assembly 5 is fixedly installed on the front panel 103. The connector assembly 5 includes several connectors, which adopt an H-type double sealing ring structure, effectively improving the sealing performance of the enclosure and preventing leakage of immersion liquid from the connectors. Specifically, as shown... Figure 8 As shown, the connector assembly 5 includes a power socket 501, a communication socket 502, and an oil level gauge 503. The power socket 501 is used for communication between the battery pack and the outside, the communication socket 502 is used to export the voltage and temperature information of the battery cell 401 monitored by the BMU, and the oil level gauge 503 is used to monitor the liquid level of the immersion liquid in the lower housing 1.

[0042] like Figure 9As shown, the connecting bus 7 includes a first copper bus 701, a second copper bus 702, and a third copper bus 703; the fuse assembly 8 includes a DC fuse 801, a fuse insulating post 802, and a fuse bracket 803, wherein the fuse bracket 803 is fixedly mounted on the front plate 103, the fuse insulating post 802 is fixedly mounted on the fuse bracket 803, the DC fuse 801 is fixedly connected to the connecting bus 7, and the DC fuse 801 is fixedly mounted on the fuse insulating post 802; the power socket 501 is connected to the second copper bus 702 and the third copper bus 703 respectively, to serve as the total positive terminal and the total negative terminal of the battery pack, the third copper bus 703 is also connected to the total positive terminal of the series-connected battery module 4, the second copper bus 702 is also fixedly connected to the DC fuse 801 and the fuse insulating post 802 of the fuse assembly 8, one end of the first copper bus 701 is fixedly connected to the DC fuse 801 and the fuse insulating post 802, and the other end is connected to the total negative terminal of the series-connected battery module 4.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fully submersible energy storage battery pack, comprising: The lower housing (1), upper housing cover (2) and several battery modules (4) are detachably connected. The lower housing (1) and upper housing cover (2) are characterized in that the lower housing (1) is filled with immersion liquid, and the battery modules (4) are completely immersed in the immersion liquid. The lower housing (1) includes a bottom plate (101), and the bottom plate (101) is provided with a liquid cooling channel (113) for the circulation of coolant.

2. The fully submersible energy storage battery pack according to claim 1, characterized in that, The lower housing (1) also includes a side plate (102), a front plate (103) and a rear plate (104). The side plate (102) is an L-shaped plate. The side plate (102) includes a horizontal section and a vertical section. The horizontal section of the side plate (102) and the bottom plate (101) are fixedly connected. The liquid cooling channel (113) is set in the horizontal section of the side plate (102) and the bottom plate (101). Both ends of the horizontal section of the side plate (102) and the bottom plate (101) are fixedly provided with channel sealing strips (105).

3. The fully submersible energy storage battery pack according to claim 2, characterized in that, A through hole (1021) is provided on the horizontal section of the side plate (102). The through hole (1021) is connected to the liquid cooling channel (113). The through hole (1021) is connected to the external liquid cooling pipe through the water nozzle (107).

4. The fully submersible energy storage battery pack according to claim 2, characterized in that, A fixing block (108) is fixedly installed at the front end of the side plate (102), and a lifting hole (110) is opened on the side of the side plate (102).

5. The fully submersible energy storage battery pack according to claim 3, characterized in that, The bottom of both the front panel (103) and the rear panel (104) extends toward the inside of the box as a module fixing beam. The front panel (103) is provided with an inlet (111) and an outlet (112). The inlet (111) and the outlet (112) are fixedly connected to the water nozzle (107). A BMU cover plate (3) is detachably installed on the front panel (103). A battery management unit is fixedly installed on the BMU cover plate (3). The battery management unit is immersed in the immersion liquid.

6. The fully submersible energy storage battery pack according to claim 1, characterized in that, An oil inlet is provided on the upper cover (2), and an oil inlet cover plate (202) is provided at the oil inlet; a vent valve (203) is fixedly installed on the upper cover (2), and a guide shroud (204) is installed on the outside of the vent valve (203).

7. The fully submersible energy storage battery pack according to claim 1, characterized in that, The battery module (4) includes several cells (401) and is bound together by steel strips (403). There are end plates (402) between the cells (401) at both ends of the battery module (4) and the steel strips (403). There are nitrile rubber strips between adjacent cells (401). There is a bottom insulating sheet (6) between the bottom of the battery module (4) and the lower box (1).

8. The fully submersible energy storage battery pack according to claim 7, characterized in that, A wire harness isolation plate (405) is provided above the battery cell (401). Several series aluminum bars (408) are embedded in the wire harness isolation plate (405). The series aluminum bars (408) connect all the battery cells (401) of the same battery module (4) in series. Output electrode aluminum bars (407) are also embedded at both ends of the wire harness isolation plate (405). The battery module (4) is connected to the outside through the output electrode aluminum bars (407).

9. The fully submersible energy storage battery pack according to claim 2, characterized in that, A power socket (501), a communication socket (502), and an oil sight glass (503) are fixedly installed on the front panel (103). An H-type double sealing ring is provided between the power socket (501), the communication socket (502), and the oil sight glass (503) and the front panel (103).

10. The fully submersible energy storage battery pack according to claim 9, characterized in that, A fuse bracket (803) is fixedly provided on the front panel (103). The fuse bracket (803) is fixedly connected to a DC fuse (801) through a fuse insulating post (802). The power socket (501) is connected to the positive terminal of the battery module (4) through the third copper busbar (703). The power socket (501) is connected to the DC fuse (801) through the second copper busbar (702). The DC fuse (801) is also connected to the negative terminal of the battery module (4) through the first copper busbar (701).

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