A water cooling system and installation method for lithium battery module

Abstract

The present invention discloses a water cooling system and installation method for a lithium battery module. It comprises a box body, the box body is provided with a box body installation groove, a plurality of cooling sleeves are fixed in the box body installation groove, an annular cooling cavity is arranged inside the cooling sleeve, the annular cooling cavity is located between the inner wall of the cooling sleeve and the outer wall of the cooling sleeve, a water tank is installed in the box body, and the plurality of annular cooling cavities are all connected with the inside of the water tank. The beneficial effects of the present invention are: the cooling effect is optimized, and it is ensured that each battery block can be fully cooled, and the cooling effect is good; the installation and fixing are simple and convenient, saving time and labor; the resource allocation of the coolant is optimized, and energy is saved; the temperature of the coolant can be further reduced, and the cooling effect is improved; the heat exchange effect between the coolant and the battery block can be further improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to lithium battery modules, and in particular to a water cooling system and an installation method for a lithium battery module. Background Art

[0002] With the promotion of environmental protection concepts, in the automotive industry, gasoline used in fuel vehicles is a gas that produces atmospheric pollution after combustion, which has an increasingly greater impact on air quality. Various adverse environmental factors such as smog weather are constantly generated, affecting people's health. In order to improve the environment, new energy vehicles have been paid attention to and continuously promoted. Electric vehicles, as a new energy source, have gradually entered people's field of vision. Various manufacturers have begun to vigorously develop electric vehicles. Therefore, electric vehicles have also become a benchmark for an industry, and they are constantly expanding. The technology is becoming more and more sophisticated. The core of electric vehicles is the lithium battery pack, but the design of the lithium battery system requires many parts. The module, as the core power supply module, is equivalent to the heart of the lithium battery system. Every small detail of the module needs to be taken seriously.

[0003] The discharge current of lithium batteries is very large during operation, which leads to a large amount of internal heat. If the heat is not managed properly, it will seriously affect the performance and cycle life of lithium batteries. In response to this problem, the industry has invented different cooling devices, including air cooling and water cooling. Practice has proved that air cooling cannot effectively manage the heat of lithium batteries, so water cooling has gradually become a hot topic in the industry.

[0004] Most of the current water cooling methods are to connect the cooling water circuits of each lithium battery in the lithium battery module in series. This method seems to solve the cooling problem of the power battery, but it also leads to a very serious problem. Since the series cooling water circuit is long, the cooling water temperature flowing through the front and rear battery blocks is different, resulting in different cooling effects on the front and rear battery blocks. The cooling effect of the front battery block is much higher than that of the rear battery block. Over time, it will seriously affect the performance and cycle life of the battery module. Summary of the invention

[0005] The present invention aims to overcome the disadvantage of different cooling effects of front and rear battery blocks in the prior art, and provides a water cooling system and an installation method for a lithium battery module with good cooling effect.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A water cooling system for a lithium battery module comprises a box body, the box body is provided with a box body mounting groove, a plurality of cooling sleeves are fixed in the box body mounting groove, an annular cooling cavity is provided inside the cooling sleeve, the annular cooling cavity is located between the inner wall of the cooling sleeve and the outer wall of the cooling sleeve, a water tank is installed in the box body, and the plurality of annular cooling cavities are all connected with the interior of the water tank.

[0008] The battery block is placed in the cooling sleeve; cooling water is supplied to the annular cooling cavity in each cooling sleeve at the same time through the water tank, and the battery block in the cooling sleeve is water-cooled, avoiding the different cooling effects of the front and rear battery blocks due to the series connection of the cooling water circuits, optimizing the cooling effect, and ensuring that each battery block can be fully cooled with good cooling effect.

[0009] Preferably, a positioning groove is provided on the bottom surface of the annular cooling cavity, and the positioning groove is symmetrically distributed about the axis of the cooling sleeve, a positioning block matching the positioning groove is fixed on the bottom surface of the box installation groove, and the cooling sleeve is installed in the box installation groove through the cooperation of the positioning groove and the positioning block. The installation and fixing are simple and convenient, saving time and effort.

[0010] Preferably, a side slide groove matching the cooling sleeve is provided on the side wall of the box installation groove, the distance between the side slide groove and the bottom surface of the box installation groove is equal to the height of the cooling sleeve, a limit baffle is slidably connected in the side slide groove, a spring 1 is provided between the limit baffle and the side slide groove, one end of the spring 1 is fixed on the bottom surface of the side slide groove, and the other end of the spring 1 is fixed on the inner side of the limit baffle, an inclined surface is provided on the outer side of the limit baffle, the inclined surface faces the side of the opening of the box installation groove, and a fillet matching the inclined surface is provided at the bottom of the cooling sleeve. During the process of placing the cooling sleeve into the box installation groove, the limit baffle is retracted into the side slide groove and compresses the spring 1 under the cooperation of the fillet and the inclined surface by the pressure of the cooling sleeve. When the cooling sleeve is placed at the bottom of the box installation groove, the pressure of the cooling sleeve on the limit baffle disappears, and the limit baffle extends out of the side slide groove under the reset action of the spring 1, clamps the cooling sleeve, and fixes the cooling sleeve.

[0011] Preferably, the bottom of the box body installation groove is provided with a channel 1 and a plurality of channels 2 matching the positioning block, the inside of the water tank is connected to one end of the channel 1, one end of a plurality of channels 2 are connected to the other end of the channel 1, the other end of the channel 2 is located on the top surface of the positioning block and is connected to the annular cooling cavity, the positioning groove and the positioning block are sealed, and the bottom of the box body installation groove is provided with a switch assembly matching the cooling sleeve. The coolant in the water tank flows out through the channel 1 and is divided into each channel 2, and flows from the channel 2 into the annular cooling cavity to cool down the battery blocks inside the cooling sleeve at the same time, ensuring that each battery block can be fully cooled and the cooling effect is good. A sealing ring is provided at the edge of the top of the positioning block. When the cooling sleeve is inserted into the box body installation groove, it is clamped by the top limit baffle, so the positioning groove at the bottom of the annular cooling cavity can be tightly pressed on the sealing ring to ensure the seal between the positioning groove and the positioning block. The switch assembly is used to control the opening and closing of channel two. When no battery block is placed in a cooling sleeve, the corresponding channel two is controlled to be closed, and the coolant will not flow into the annular cooling cavity for cooling circulation, thereby optimizing the resource allocation of the coolant and saving energy.

[0012] Preferably, the switch assembly includes a slide groove arranged between two channels II corresponding to the cooling pipe sleeves, the slide groove is located at the bottom of the box mounting groove, the two ends of the slide groove are respectively connected to the two channels II, the two ends of the slide groove are slidably connected with liquid baffles matching the width of the channel II, a spring II is arranged in the slide groove, the two ends of the spring II are respectively fixedly connected to the two liquid baffles, a mounting hole connected to the slide groove is provided on the bottom surface of the box mounting groove, the mounting hole is placed in the middle position of the slide groove and a pressure block is slidably connected therein, the mounting hole and the pressure block are sealingly connected, the bottom of the pressure block is located on one side of the spring II, the top of the pressure block passes through the mounting hole and is placed in the box mounting groove, the side wall of the slide groove is provided with a side opening matching the bottom of the pressure block, and the side opening is located on the other side of the spring II. In the natural state, the liquid baffles at both ends of the slide groove are pressed into channel two under the elastic force of spring two, blocking channel two so that the coolant does not flow through; when the battery block is placed in the cooling tube sleeve, the pressing block is pressed into the mounting hole under the pressure of the battery block, and presses spring two into the side opening, thereby driving the liquid baffle plate to retract into the slide groove, so that the coolant can smoothly pass through channel two and flow into the annular cooling cavity.

[0013] Preferably, a chamber is provided inside the box, the chamber is placed on the side of the box installation slot, the water tank is fixed in the chamber, a heat exchanger is fixed in the chamber, a plurality of heat dissipation holes matching the heat exchanger are provided on the side wall of the chamber, the heat exchanger is installed on the top of the water tank and communicated with the inside of the water tank, a water pump is installed inside the water tank, and the water tank is connected to channel 1 through the water pump. The coolant in the water tank enters channel 1 through the water pump; the heat exchanger condenses the coolant after heat exchange with the battery block, and discharges the heat out of the box through the heat dissipation holes, and the condensed coolant returns to the water tank for recycling.

[0014] Preferably, a one-way valve is installed on the top of the annular cooling cavity, the heat exchanger is connected to the one-way valve pipeline, a rotary atomizing nozzle is provided on the heat exchanger, the rotary atomizing nozzle is installed on the top surface of the inside of the water tank, and the heat exchanger is connected to the inside of the water tank through the rotary atomizing nozzle. The design of the one-way valve can prevent the coolant after heat exchange with the battery block from flowing back into other annular cooling cavities. The coolant treated by the heat exchanger is sprayed into the water tank through the rotary atomizing nozzle, which can further reduce the temperature of the coolant and improve the cooling effect.

[0015] Preferably, a cover plate is installed at the opening of the box installation groove, the cover plate is threadedly connected to the box installation groove, a fixing block matching the inside of the cooling sleeve is fixed on the cover plate, and a plurality of interface through holes are provided on the fixing block. The fixing block is used to resist the battery block installed in the cooling sleeve to fix the battery block; different battery blocks are connected to the positive and negative electrodes through the interface through holes.

[0016] Preferably, the material of the inner wall of the annular cooling cavity is a heat-conducting material, the material of the outer wall of the annular cooling cavity is a heat-insulating material, and the inner wall of the annular cooling cavity is provided with heat dissipation fins. The material of the inner wall of the annular cooling cavity may be copper, and the additional heat dissipation fins may further improve the heat exchange effect between the coolant and the battery block; the material of the outer wall of the annular cooling cavity may be glass fiber, which plays a role in heat insulation between the cooling sleeve and the box body mounting groove and between two adjacent cooling sleeves.

[0017] The present invention also provides a method for installing a lithium battery module, comprising the following steps:

[0018] Step 1: Install the water tank and heat exchanger in the chamber of the box, install the water pump in the water tank and inject an appropriate amount of coolant;

[0019] Step 2: install and fix several cooling sleeves in the box installation groove of the box body, connect the water tank to the annular cooling cavity in each cooling sleeve through the water pump, and install a switch device at the liquid inlet of each annular cooling cavity;

[0020] Step 3: Install a one-way valve at the liquid outlet of each annular cooling cavity and connect it to the heat exchanger through a collecting pipe;

[0021] Step 4: Place the battery block in the cooling sleeve and turn on the switch on the cooling sleeve with the battery block to open the channel between the annular cooling cavity of the cooling sleeve and the water pump. Finally, connect the positive and negative poles of different battery blocks to complete the installation.

[0022] Cooling water is supplied to the annular cooling cavity in each cooling sleeve through a water tank, and the battery blocks in the cooling sleeve are cooled by water, thereby avoiding the different cooling effects of the front and rear battery blocks due to the series connection of the cooling water circuits, optimizing the cooling effect, and ensuring that each battery block can be fully cooled with good cooling effect; the switch component is used to control the opening and closing of channel two. When no battery block is placed in a cooling sleeve, the corresponding channel two is controlled to be closed, and the coolant will not flow into the annular cooling cavity for cooling circulation, thereby optimizing the resource allocation of the coolant and saving energy.

[0023] The beneficial effects of the present invention are: the cooling effect is optimized, ensuring that each battery block can be fully cooled and the cooling effect is good; the installation and fixing are simple and convenient, saving time and effort; the resource allocation of the coolant is optimized, saving energy; the temperature of the coolant can be further reduced, and the cooling effect can be improved; and the heat exchange effect between the coolant and the battery block can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of the present invention;

[0025] Figure 2 is a top view of the present invention;

[0026] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle;

[0027] Figure 4 yes Figure 3 The enlarged view of point B in the middle;

[0028] Figure 5 yes Figure 2 Installation drawing of the middle cooling pipe sleeve;

[0029] Figure 6 yes Figure 5 Structural diagram of the middle box installation slot;

[0030] Figure 7 yes Figure 6 Sectional view at C in the middle;

[0031] Figure 8 yes Figure 3The schematic diagram of the cooling sleeve structure in the figure.

[0032] In the figure: 1. box body, 2. cover plate, 3. box body mounting groove, 4. fixing block, 5. interface through hole, 6. cooling pipe sleeve, 7. annular cooling chamber, 8. positioning groove, 9. channel 2, 10. positioning block, 11. channel 1, 12. chamber, 13. water tank, 14. heat exchanger, 15. heat dissipation hole, 16. mounting hole, 17. pressing block, 18. liquid baffle plate, 19. slide groove, 20. side opening, 21. spring 2, 22. one-way valve, 23. limit baffle, 24. inclined surface, 25. side slide groove, 26. spring 1, 27. heat dissipation fin, 28. fillet. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] like Figure 1 and Figure 2 In the embodiment described, a water cooling system for a lithium battery module includes a box 1, such as Figure 3 As shown, a box body mounting groove 3 is provided on the box body 1, and a plurality of cooling sleeves 6 are fixed in the box body mounting groove 3. An annular cooling cavity 7 is provided inside the cooling sleeve 6. The annular cooling cavity 7 is located between the inner wall of the cooling sleeve 6 and the outer wall of the cooling sleeve 6. A water tank 13 is installed in the box body 1, and the plurality of annular cooling cavities 7 are connected to the inside of the water tank 13.

[0035] like Figure 3 As shown, a positioning groove 8 is provided on the bottom surface of the annular cooling cavity 7, and the positioning groove 8 is symmetrically distributed about the axis of the cooling sleeve 6. A positioning block 10 matching the positioning groove 8 is fixed on the bottom surface of the box mounting groove 3, and the cooling sleeve 6 is installed in the box mounting groove 3 through the cooperation of the positioning groove 8 and the positioning block 10.

[0036] like Figure 5 , Figure 6 and Figure 7 As shown, a side slide groove 25 matching the cooling pipe sleeve 6 is provided on the side wall of the box mounting groove 3, the distance from the side slide groove 25 to the bottom surface of the box mounting groove 3 is equal to the height of the cooling pipe sleeve 6, a limit baffle 23 is slidably connected in the side slide groove 25, a spring 26 is provided between the limit baffle 23 and the side slide groove 25, one end of the spring 26 is fixed on the bottom surface of the side slide groove 25, the other end of the spring 26 is fixed on the inner side of the limit baffle 23, an inclined surface 24 is provided on the outer side of the limit baffle 23, the inclined surface 24 faces the side of the opening of the box mounting groove 3, and a fillet 28 matching the inclined surface 24 is provided on the bottom of the cooling pipe sleeve 6.

[0037] like Figure 3As shown, a channel 11 and a plurality of channel 2s 9 matching the positioning block 10 are provided at the bottom of the box body mounting groove 3, the interior of the water tank 13 is connected to one end of the channel 11, one ends of a plurality of channel 2s 9 are connected to the other end of the channel 11, the other end of the channel 2 9 is located on the top surface of the positioning block 10 and is connected to the annular cooling cavity 7, the positioning groove 8 and the positioning block 10 are sealed and connected, and a switch assembly matching the cooling pipe sleeve 6 is provided at the bottom of the box body mounting groove 3.

[0038] like Figure 3 and Figure 4 As shown, the switch assembly includes a slide groove 19 arranged between two channels 29 corresponding to the cooling pipe sleeve 6, the slide groove 19 is located at the bottom of the box mounting groove 3, the two ends of the slide groove 19 are respectively connected to the two channels 29, both ends of the slide groove 19 are slidably connected with a liquid baffle plate 18 matching the width of the channel 29, a spring 21 is arranged in the slide groove 19, the two ends of the spring 21 are respectively fixedly connected to the two liquid baffle plates 18, a mounting hole 16 connected to the slide groove 19 is provided on the bottom surface of the box mounting groove 3, the mounting hole 16 is placed in the middle position of the slide groove 19 and a pressure block 17 is slidably connected therein, the mounting hole 16 and the pressure block 17 are sealed and connected, the bottom of the pressure block 17 is located on one side of the spring 21, the top of the pressure block 17 passes through the mounting hole 16 and is placed in the box mounting groove 3, and a side opening 20 matching the bottom of the pressure block 17 is provided on the side wall of the slide groove 19, and the side opening 20 is located on the other side of the spring 21.

[0039] like Figure 3 As shown, a chamber 12 is provided inside the box body 1, and the chamber 12 is placed on the side of the box body mounting groove 3. A water tank 13 is fixed in the chamber 12, and a heat exchanger 14 is fixed in the chamber 12. A plurality of heat dissipation holes 15 matching the heat exchanger 14 are provided on the side wall of the chamber 12. The heat exchanger 14 is installed on the top of the water tank 13 and is connected with the inside of the water tank 13. A water pump is installed inside the water tank 13, and the water tank 13 is connected to the channel 11 through the water pump.

[0040] like Figure 3 and Figure 5 As shown, a one-way valve 22 is installed on the top of the annular cooling chamber 7, the heat exchanger 14 is connected to the one-way valve 22 by a pipeline, a rotary atomizing nozzle is provided on the heat exchanger 14, and the rotary atomizing nozzle is installed on the top surface of the water tank 13, and the heat exchanger 14 is connected to the inside of the water tank 13 through the rotary atomizing nozzle.

[0041] like Figure 3 As shown, a cover plate 2 is installed at the opening of the box installation groove 3, the cover plate 2 and the box installation groove 3 are threadedly connected, a fixing block 4 matching the inside of the cooling pipe sleeve 6 is fixed on the cover plate 2, and a plurality of interface through holes 5 are provided on the fixing block 4.

[0042] like Figure 8As shown, the material of the inner wall of the annular cooling cavity 7 is a heat-conducting material, the material of the outer wall of the annular cooling cavity 7 is a heat-insulating material, and the inner wall of the annular cooling cavity 7 is provided with heat dissipation fins 27 .

[0043] The present invention also provides a method for installing a lithium battery module, comprising the following steps:

[0044] Step 1: Install the water tank and heat exchanger in the chamber of the box, install the water pump in the water tank and inject an appropriate amount of coolant;

[0045] Step 2: install and fix several cooling sleeves in the box installation groove of the box body, connect the water tank to the annular cooling cavity in each cooling sleeve through the water pump, and install a switch device at the liquid inlet of each annular cooling cavity;

[0046] Step 3: Install a one-way valve at the liquid outlet of each annular cooling cavity and connect it to the heat exchanger through a collecting pipe;

[0047] Step 4: Place the battery block in the cooling sleeve and turn on the switch on the cooling sleeve with the battery block to open the channel between the annular cooling cavity of the cooling sleeve and the water pump. Finally, connect the positive and negative poles of different battery blocks to complete the installation.

[0048] Specific installation process:

[0049] 1. Install the water tank 13 and the heat exchanger 14 in the chamber 12, install the water pump inside the water tank 13, and keep the water pump and the channel 1 11 connected, and then inject an appropriate amount of coolant into the water tank 13.

[0050] 2. Open the cover plate 2 and install the cooling sleeve 6 into the box mounting groove 3: When the cooling sleeve 6 is placed into the box mounting groove 3, with the cooperation of the fillet 28 and the inclined surface 24, the limit baffle 23 is retracted into the side slide groove 25 by the pressure of the cooling sleeve 6 and compresses the spring 1 26; when the cooling sleeve 6 is placed at the bottom of the box mounting groove 3, it is positioned by the positioning groove 8 at the bottom of the annular cooling cavity 7 and the corresponding positioning block 10 on the bottom surface of the box mounting groove 3. At this time, the pressure of the cooling sleeve 6 on the limit baffle 23 just disappears, and the limit baffle 23 extends out of the side slide groove 25 under the resetting action of the spring 1 26, and clamps the cooling sleeve 6 (at this time, the positioning groove 8 is tightly pressed on the sealing ring at the top edge of the positioning block 10 to ensure the sealing between the positioning groove 8 and the positioning block 10).

[0051] 3. Connect the one-way valve 22 on the top of each annular cooling chamber 7 to the heat exchanger 14 through a collecting pipe.

[0052] 4. Place the battery block into the cooling sleeve 6: When the battery block is placed into the cooling sleeve 6, the pressing block 17 on the bottom surface of the box mounting groove 3 is pressed into the mounting hole 16 under the pressure of the battery block, and the spring 21 is pressed into the side opening 20, thereby driving the liquid baffle 18 to retract into the slide groove 19, so that the channel 2 9 in the positioning block 10 is opened.

[0053] Fifth, close the cover plate 2, and fix the fixing block 4 on the cover plate 2 against the battery block in the cooling pipe sleeve 6 to fix it. Finally, connect the positive and negative electrodes of different battery blocks through the interface through holes 5 to complete the installation.

Claims

1. A water cooling system for a lithium battery module, characterized in that: The invention comprises a box body (1), wherein the box body (1) is provided with a box body installation groove (3), wherein a plurality of cooling sleeves (6) are fixed in the box body installation groove (3), wherein an annular cooling cavity (7) is arranged inside the cooling sleeve (6), wherein the annular cooling cavity (7) is located between the inner wall of the cooling sleeve (6) and the outer wall of the cooling sleeve (6), wherein a water tank (13) is installed in the box body (1), wherein the plurality of annular cooling cavities (7) are all connected to the inside of the water tank (13), wherein positioning grooves (8) are arranged on the bottom surface of the annular cooling cavity (7), wherein the positioning grooves (8) are symmetrically distributed about the axis of the cooling sleeve (6), wherein a positioning block (10) matching the positioning grooves (8) is fixed on the bottom surface of the box body installation groove (3), wherein the positioning grooves (8) are arranged on the bottom surface of the box body installation groove (3), wherein the ... grooves (8) are arranged on the bottom surface of the box body installation groove (3), wherein the positioning grooves (8) are arranged on the bottom surface of the box body installation groove (3), wherein the positioning grooves (8) are arranged on the bottom surface of the box body installation The cooling pipe sleeve (6) is installed in the box installation groove (3) through the cooperation of the positioning groove (8) and the positioning block (10); the bottom of the box installation groove (3) is provided with a channel one (11) and a plurality of channel twos (9) matching the positioning block (10); the interior of the water tank (13) is connected to one end of the channel one (11); one end of the plurality of channel twos (9) is connected to the other end of the channel one (11); the other end of the channel two (9) is located on the top surface of the positioning block (10) and is connected to the annular cooling cavity (7); the positioning groove (8) and the positioning block (10) are sealed and connected; the bottom of the box installation groove (3) is provided with a switch assembly matching the cooling pipe sleeve (6); the switch assembly includes a switch assembly matching the cooling pipe sleeve ( 6) is provided between the two corresponding channels 2 (9), the slide groove (19) is located at the bottom of the box mounting groove (3), the two ends of the slide groove (19) are respectively connected to the two channels 2 (9), the two ends of the slide groove (19) are slidably connected to the liquid baffle plates (18) matching the width of the channel 2 (9), a spring 2 (21) is provided in the slide groove (19), the two ends of the spring 2 (21) are respectively fixedly connected to the two liquid baffle plates (18), a mounting hole (16) connected to the slide groove (19) is provided on the bottom surface of the box mounting groove (3), the mounting hole (16) is located in the middle of the slide groove (19) and a pressure block (17) is slidably connected therein, the mounting hole (16) ) and a pressure block (17) are sealed and connected, the bottom of the pressure block (17) is located on one side of the spring 2 (21), the top of the pressure block (17) passes through the mounting hole (16) and is placed in the box mounting groove (3), the side wall of the slide groove (19) is provided with a side opening (20) matching the bottom of the pressure block (17), the side opening (20) is located on the other side of the spring 2 (21), the box (1) is provided with a chamber (12) inside, the chamber (12) is placed on the side of the box mounting groove (3), the water tank (13) is fixed in the chamber (12), a heat exchanger (14) is fixed in the chamber (12), and a plurality of heat dissipation holes (15) matching the heat exchanger (14) are provided on the side wall of the chamber (12),The heat exchanger (14) is installed on the top of the water tank (13) and is connected to the inside of the water tank (13). A water pump is installed inside the water tank (13). The water tank (13) is connected to the channel 1 (11) through the water pump. A one-way valve (22) is installed on the top of the annular cooling chamber (7). The heat exchanger (14) and the one-way valve (22) are connected by a pipeline. A rotary atomizing nozzle is provided on the heat exchanger (14). The rotary atomizing nozzle is installed on the top surface of the water tank (13). The heat exchanger (14) is connected to the inside of the water tank (13) through the rotary atomizing nozzle.

2. The water cooling system of a lithium battery module according to claim 1, characterized in that: A side sliding groove (25) matching with the cooling pipe sleeve (6) is provided on the side wall of the box mounting groove (3); the distance between the side sliding groove (25) and the bottom surface of the box mounting groove (3) is equal to the height of the cooling pipe sleeve (6); a limit baffle (23) is slidably connected in the side sliding groove (25); a spring (26) is provided between the limit baffle (23) and the side sliding groove (25); one end of the spring (26) is fixed to the bottom surface of the side sliding groove (25); the other end of the spring (26) is fixed to the inner side of the limit baffle (23); an inclined surface (24) is provided on the outer side of the limit baffle (23); the inclined surface (24) faces the side of the opening of the box mounting groove (3); and a fillet (28) matching with the inclined surface (24) is provided at the bottom of the cooling pipe sleeve (6).

3. The water cooling system of a lithium battery module according to claim 1, characterized in that: A cover plate (2) is installed at the opening of the box body installation groove (3), the cover plate (2) and the box body installation groove (3) are threadedly connected, a fixing block (4) matching the inside of the cooling pipe sleeve (6) is fixed on the cover plate (2), and a plurality of interface through holes (5) are provided on the fixing block (4).

4. The water cooling system of a lithium battery module according to claim 1, characterized in that: The material of the inner wall of the annular cooling cavity (7) is a heat-conducting material, the material of the outer wall of the annular cooling cavity (7) is a heat-insulating material, and heat dissipation fins (27) are provided on the inner wall of the annular cooling cavity (7).

5. The method for installing a water cooling system of a lithium battery module according to claim 1, comprising the following steps: Step 1: Install the water tank and heat exchanger in the chamber of the box, install the water pump in the water tank and inject an appropriate amount of coolant; Step 2: install and fix several cooling sleeves in the box installation groove of the box body, connect the water tank to the annular cooling cavity in each cooling sleeve through the water pump, and install a switch device at the liquid inlet of each annular cooling cavity; Step 3: Install a one-way valve at the liquid outlet of each annular cooling cavity and connect it to the heat exchanger through a collecting pipe; Step 4: Place the battery block in the cooling sleeve and turn on the switch on the cooling sleeve with the battery block to open the channel between the annular cooling cavity of the cooling sleeve and the water pump. Finally, connect the positive and negative poles of different battery blocks to complete the installation.

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