A closed structure lithium battery cell with a cooling closed compartment

Abstract

The present invention relates to the technical field of lithium battery cells, specifically a closed structure lithium battery cell with a cooling closed compartment, which solves the problem that the lithium battery cell needs to have a high overall sealing performance for installation, resulting in the heat generated by the lithium battery cell during the charging and discharging process not being dissipated in time, causing the lithium battery cell to easily overheat, thus affecting the safe operation of the lithium battery cell. A closed structure lithium battery cell with a cooling closed compartment includes a coolant storage box, a battery pack upper shell and a battery pack lower shell, the battery pack upper shell and the battery pack lower shell are symmetrical up and down and connected by bolts, the bottom surface of the battery pack upper shell and the upper surface of the battery pack lower shell are both provided with a sealing card groove, and a sealing ring is clamped inside the sealing card groove. The present invention accelerates the dissipation of heat inside the lithium battery cell without destroying the sealing performance of the lithium battery cell, thereby avoiding overheating inside the lithium battery cell and affecting the safe operation of the lithium battery.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery cells, in particular to a closed-structure lithium battery cell with a cooling closed compartment. Background Art

[0002] A lithium battery cell is a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable. Lithium metal batteries are superior to lithium-ion batteries in terms of safety, specific capacity, self-discharge rate, and performance-price ratio. Lithium metal batteries generally use manganese dioxide as the positive electrode material, metallic lithium or its alloy metal as the negative electrode material, and a non-aqueous electrolyte solution.

[0003] However, the existing lithium battery cells require a high degree of overall sealing for installation, resulting in the heat generated by the lithium battery cells during the charging and discharging process cannot be dissipated in time, causing the lithium battery cells to easily overheat, affecting the safe operation of the lithium battery cells; therefore, it does not meet the existing needs. In this regard, we propose a closed structure lithium battery cell with a cooling closed compartment. Summary of the Invention

[0004] The purpose of the present invention is to provide a closed structure lithium battery cell with a cooling closed compartment to solve the problems proposed in the above background technology that the lithium battery cell needs to have a high overall sealing for installation, resulting in the heat generated by the lithium battery cell during the charging and discharging process cannot be dissipated in time, causing the lithium battery cell to easily overheat, affecting the safe operation of the lithium battery cell.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a closed structure lithium battery cell with a cooling closed compartment, comprising a coolant storage tank, a battery pack upper shell, and a battery pack lower shell, wherein the battery pack upper shell and the battery pack lower shell are symmetrical in vertical direction and connected by bolts, the bottom surface of the battery pack upper shell and the upper surface of the battery pack lower shell are both provided with a sealing card groove, the inner side of which is clamped with a sealing ring, a plurality of lithium battery closed compartments are distributed in a rectangular array between the battery pack upper shell and the battery pack lower shell, a lithium battery cooling compartment is provided between the lithium battery closed compartment and the battery pack upper shell and the battery pack lower shell, and a water pipe clamp groove is provided on the upper surface of the battery pack upper shell and the bottom surface of the battery pack lower shell;

[0006] A coolant outlet pipe and a coolant recovery pipe are fixed to the ends of the coolant storage tank facing the upper shell and the lower shell of the battery pack, and a first circulating cooling pump is fixed to the end of the coolant outlet pipe, and a coolant inlet pipe is fixed to the output end of the first circulating cooling pump, and the coolant inlet pipe is clamped to the inner side of the water pipe clamping groove at the bottom of the lower shell of the battery pack, and the end of the coolant inlet pipe away from the first circulating cooling pump passes through the lower shell of the battery pack and is fixed to the bottom of the lithium battery cooling compartment, and a second circulating cooling pump is fixed to the end of the coolant recovery pipe, and a coolant return pipe is fixed to the input end of the second circulating cooling pump, and the coolant return pipe is clamped to the inner side of the water pipe clamping groove at the top of the upper shell of the battery pack, and the end of the coolant return pipe away from the second circulating cooling pump passes through the upper shell of the battery pack and is fixed to the top of the lithium battery cooling compartment.

[0007] Preferably, the lithium battery cooling compartment includes a cooling protection liquid sac, the interior of the cooling protection liquid sac is hollow and connected to the coolant return pipe and the coolant inlet pipe, a plurality of top buffer water sacs are distributed in a top rectangular array of the cooling protection liquid sac, and a plurality of bottom buffer water sacs are distributed in a bottom rectangular array of the cooling protection liquid sac, and a connecting water pipe is fixed on the same side of the upper and lower adjacent top buffer water sacs and bottom buffer water sacs, and the ends of the connecting water pipes are connected to the top buffer water sac and the bottom buffer water sac.

[0008] Preferably, a third docking branch with two overlapping axes is fixed on the outside of the end portion where the coolant return pipe is connected to the cooling protection liquid bag, and multiple first docking branches are fixed on both sides of the third docking branch. One end of the first docking branch is fixed to the top buffer water bag and is connected to the inside of the top buffer water bag.

[0009] Preferably, a fourth docking branch with two overlapping axes is fixed on the outside of the end portion where the coolant inlet pipe is connected to the cooling protection liquid bag, and multiple second docking branches are fixed on both sides of the fourth docking branch. One end of the second docking branch is fixed to the bottom buffer water bag and is connected to the inside of the bottom buffer water bag.

[0010] Preferably, the lithium battery enclosed compartment includes a battery wrapping shell, and a lithium battery separator is detachably installed inside the battery wrapping shell. The lithium battery separator divides the interior of the battery wrapping shell into multiple lithium battery installation compartments, and the inner side of the lithium battery installation compartments is installed with single lithium batteries.

[0011] Preferably, the upper and lower surfaces of the lithium battery separator are provided with a plurality of plug holes distributed in a rectangular array, and a heat dissipation groove is provided between the plug holes distributed on the upper and lower surfaces of the lithium battery separator, and the heat dissipation groove is connected to the lithium battery installation compartment.

[0012] Preferably, the bottom surface of the top buffer water bag and the upper surface of the bottom buffer water bag are both inlaid with heat dissipation plates, and a plurality of heat dissipation hollow tubes are fixed on the surface of the heat dissipation plates in a rectangular array, and the heat dissipation hollow tubes extend to the inside of the heat dissipation groove through the plug hole.

[0013] Preferably, a closed partition is provided on the inner side of the heat dissipation groove, and the closed partition is fixed inside the lithium battery partition to separate adjacent lithium battery installation compartments.

[0014] Preferably, the upper surface and the bottom surface of the closed partition are both provided with a plurality of plug-in positioning grooves distributed in a rectangular array, and the number of the plug-in positioning grooves is consistent with the number of the plug-in holes and they correspond one to one.

[0015] Preferably, the bottom end of the heat dissipation hollow tube extends to the inner side of the plug-in positioning groove, and a closed cross plug-in block is fixed on the inner side of the plug-in positioning groove. The closed cross plug-in block is plugged into the inside of the heat dissipation hollow tube and the outer edge is in contact with the inner wall of the heat dissipation hollow tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention utilizes a cooling protection liquid bladder, a top buffer water bladder, and a bottom buffer water bladder to fully wrap the lithium battery cell, and absorbs the heat generated by the single lithium battery through a heat dissipation hollow tube and a heat dissipation plate. Subsequently, the coolant flows through the cooling protection liquid bladder, the top buffer water bladder, and the bottom buffer water bladder to dissipate the heat transferred from the single lithium battery to the interior of the battery wrapping shell and the heat absorbed by the heat dissipation plate and the heat dissipation hollow tube. Without destroying the sealing of the closed structure lithium battery cell, the present invention accelerates the dissipation of heat inside the closed structure lithium battery cell, thereby preventing overheating inside the closed structure lithium battery cell and affecting the operating safety of the lithium battery.

[0018] 2. The present invention uses the presence of the heat dissipation groove to allow the heat generated by the single lithium battery inside the lithium battery installation compartment to flow to the end of the heat dissipation hollow tube, and uses a closed partition to isolate the heat dissipation groove inside the lithium battery partition, so that the heat between adjacent lithium battery installation compartments will not be transferred to each other, avoiding the heat of adjacent single lithium batteries transferring to each other and generating thermal interference, and the ends of the heat dissipation hollow tube are separated by a closed cross plug block, so that the heat from adjacent internal parts is mixed after entering the heat dissipation hollow tube for a certain distance, thereby preventing the heat from being too high. After entering the end of the heat dissipation hollow tube, the heat flows directly into the interior of another lithium battery installation compartment along the gap between the heat dissipation hollow tube and the closed partition;

[0019] 3. The present invention utilizes lithium battery separators to divide the interior of the battery packaging shell into multiple lithium battery installation compartments, so that the single lithium batteries that constitute the lithium battery unit are independent of each other, so that the heat generated by the single lithium batteries in adjacent lithium battery installation compartments during operation will not be transferred to each other, avoiding the heat transfer between adjacent single lithium batteries to generate thermal interference and affect the operation of the single lithium batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0021] Figure 2 A structural cross-sectional view of the upper and lower battery pack shells of the present invention;

[0022] Figure 3 This is a schematic structural diagram of the lithium battery cooling compartment of the present invention;

[0023] Figure 4 This is a schematic diagram of the assembly of the lithium battery cooling compartment and the lithium battery enclosed compartment of the present invention;

[0024] Figure 5 for Figure 4 A magnified view of the structure at point A;

[0025] Figure 6 This is a schematic diagram of the connection between the top buffer water bag and the bottom buffer water bag of the present invention;

[0026] Figure 7 This is a bottom view of the bottom buffer water bag of the present invention;

[0027] Figure 8 This is a schematic structural diagram of a closed compartment of a lithium battery according to the present invention;

[0028] Figure 9 This is a cross-sectional view of the transverse structure of the lithium battery separator of the present invention;

[0029] Figure 10 for Figure 9 A magnified view of the structure at B in the middle;

[0030] Figure 11 It is a structural schematic diagram of the closed cross plug-in block of the present invention.

[0031] Figure: 1, coolant storage tank; 2, battery pack upper shell; 3, battery pack lower shell; 4, lithium battery cooling compartment; 401, cooling protection liquid bag; 402, top buffer water bag; 403, bottom buffer water bag; 404, connecting water pipe; 405, first docking branch; 406, third docking branch; 407, second docking branch; 408, fourth docking branch; 409, heat sink; 410, heat dissipation hollow tube; 5, lithium battery closed compartment; 501, battery wrapping shell Body; 502, lithium battery separator; 503, lithium battery installation compartment; 504, single lithium battery; 505, plug hole; 506, closed partition; 507, heat dissipation groove; 508, plug positioning groove; 509, closed cross plug block; 6, coolant outlet pipe; 7, coolant recovery pipe; 8, coolant inlet pipe; 9, coolant return pipe; 10, water pipe clamping groove; 11, sealing clamping groove; 12, first circulation cooling pump; 13, second circulation cooling pump; 14, sealing ring. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] like Figures 1 to 3 As shown, a closed structure lithium battery unit with a cooling closed compartment includes a coolant storage box 1, a battery pack upper shell 2 and a battery pack lower shell 3. The battery pack upper shell 2 and the battery pack lower shell 3 are symmetrical up and down and connected by bolts. The bottom surface of the battery pack upper shell 2 and the upper surface of the battery pack lower shell 3 are both provided with a sealing groove 11, and a sealing ring 14 is clamped on the inner side of the sealing groove 11. A plurality of lithium battery closed compartments 5 are distributed in a rectangular array between the battery pack upper shell 2 and the battery pack lower shell 3. A lithium battery cooling compartment 4 is provided between the lithium battery closed compartment 5 and the battery pack upper shell 2 and the battery pack lower shell 3. The upper surface of the battery pack upper shell 2 and the bottom surface of the battery pack lower shell 3 are both provided with a water pipe clamping groove 10.

[0034] A coolant outlet pipe 6 and a coolant recovery pipe 7 are fixed to the end of the coolant storage tank 1 facing the battery pack upper shell 2 and the battery pack lower shell 3. A first circulating cooling pump 12 is fixed to the end of the coolant outlet pipe 6. A coolant inlet pipe 8 is fixed to the output end of the first circulating cooling pump 12. The coolant inlet pipe 8 is clamped to the inner side of the water pipe clamping groove 10 at the bottom of the battery pack lower shell 3, and the end of the coolant inlet pipe 8 away from the first circulating cooling pump 12 passes through the battery pack lower shell 3 and is fixed to the bottom of the lithium battery cooling compartment 4. A second circulating cooling pump 13 is fixed to the end of the coolant recovery pipe 7. A coolant return pipe 9 is fixed to the input end of the second circulating cooling pump 13. The coolant return pipe 9 is clamped to the inner side of the water pipe clamping groove 10 at the top of the battery pack upper shell 2, and the end of the coolant return pipe 9 away from the second circulating cooling pump 13 passes through the battery pack upper shell 2 and is fixed to the top of the lithium battery cooling compartment 4.

[0035] The lithium battery cooling compartment 4 is used to wrap the lithium battery closed compartment 5 in which the single lithium battery 504 is installed. When the lithium battery unit is running, the coolant stored in the coolant storage tank 1 is extracted and sent to the lithium battery cooling compartment 4 through the coolant outlet pipe 6, the first circulating cooling pump 12 and the coolant inlet pipe 8. The coolant then returns to the coolant storage tank 1 through the coolant return pipe 9, the second circulating cooling pump 13 and the coolant recovery pipe 7, realizing the circulation of the coolant. During the flow of the coolant, the heat inside the lithium battery unit is dissipated to avoid overheating inside the lithium battery unit and affecting the operation and operation safety.

[0036] like Figures 4 to 7 As shown, the lithium battery cooling compartment 4 includes a cooling protection liquid sac 401, the interior of the cooling protection liquid sac 401 is hollow and connected to the coolant return pipe 9 and the coolant inlet pipe 8, a plurality of top buffer water sacs 402 are distributed in a top rectangular array of the cooling protection liquid sac 401, and a plurality of bottom buffer water sacs 403 are distributed in a bottom rectangular array of the cooling protection liquid sac 401. A connecting water pipe 404 is fixed on the same side of the upper and lower adjacent top buffer water sacs 402 and bottom buffer water sacs 403, and the end of the connecting water pipe 404 is connected to the top buffer water sac 402 and the bottom buffer water sac 403. The coolant is transported to the interior of the cooling protection liquid sac 401 through the coolant inlet pipe 8 and the coolant inside the cooling protection liquid sac 401 is refluxed through the coolant return pipe 9 to realize the circulation of the coolant.

[0037] The outer side of the end portion where the coolant return pipe 9 is connected to the cooling protection liquid capsule 401 is fixed with two third docking branches 406 whose axes coincide with each other. A plurality of first docking branches 405 are fixed on both sides of the third docking branch 406. One end of the first docking branch 405 is fixed to the top buffer water capsule 402 and communicates with the inside of the top buffer water capsule 402. The outer side of the end portion where the coolant inlet pipe 8 is connected to the cooling protection liquid capsule 401 is fixed with two fourth docking branches 408 whose axes coincide with each other. A plurality of second docking branches 407 are fixed on both sides of the fourth docking branch 408. One end of the second docking branch 407 is fixed to the top buffer water capsule 402 and communicates with the inside of the top buffer water capsule 402. The bottom buffer water bag 403 is fixed and connected to the interior of the bottom buffer water bag 403. The coolant inside the coolant inlet pipe 8 is transported into the interior of the bottom buffer water bag 403 through the fourth docking branch 408 and the second docking branch 407. Then the coolant enters the top buffer water bag 402 from the connecting water pipe 404. Subsequently, the coolant enters the coolant return pipe 9 through the first docking branch 405 and the third docking branch 406. The coolant flows inside the top buffer water bag 402 and the bottom buffer water bag 403 and dissipates heat from the top and bottom of the single lithium battery 504, thereby improving the heat dissipation efficiency of the lithium battery.

[0038] like Figures 8 to 11 As shown, the lithium battery enclosed compartment 5 includes a battery encapsulating shell 501, and a lithium battery separator 502 is detachably installed inside the battery encapsulating shell 501. The lithium battery separator 502 divides the interior of the battery encapsulating shell 501 into multiple lithium battery installation compartments 503. The inner side of the lithium battery installation compartment 503 is installed with a single lithium battery 504. The lithium battery separator 502 is used to seal and separate adjacent single lithium batteries 504 to avoid heat transfer and interference between adjacent single lithium batteries 504.

[0039] The upper and lower surfaces of the lithium battery separator 502 are provided with a plurality of plug holes 505 distributed in a rectangular array. A heat dissipation groove 507 is provided between the plug holes 505 distributed on the upper and lower surfaces of the lithium battery separator 502. The heat dissipation groove 507 is connected to the lithium battery installation compartment 503. The bottom surface of the top buffer water bag 402 and the upper surface of the bottom buffer water bag 403 are both inlaid with heat dissipation plates 409. A plurality of heat dissipation hollow tubes 410 are fixed in a rectangular array on the surface of the heat dissipation plate 409. The heat dissipation hollow tubes 410 extend through the plug holes 505 to the inside of the heat dissipation groove 507. The heat generated by the single lithium battery 504 during operation enters the interior of the heat dissipation groove 507. After entering the interior of the plug positioning groove 508, the heat enters the heat dissipation hollow tube 410 from the hollow end of the heat dissipation hollow tube 410 and is transferred to the heat dissipation plate 409. The heat absorbed by the heat dissipation plate 409 is absorbed by the coolant flowing in the top buffer water bag 402 and the bottom buffer water bag 403.

[0040] The inner side of the heat dissipation groove 507 is provided with a closed partition 506, which is fixed inside the lithium battery partition 502 to separate the adjacent lithium battery installation compartment 503. The upper surface and the bottom surface of the closed partition 506 are provided with a plurality of plug-in positioning grooves 508 distributed in a rectangular array. The number of the plug-in positioning grooves 508 is consistent with that of the plug-in holes 505 and they correspond one to one. The bottom end of the heat dissipation hollow tube 410 extends to the inner side of the plug-in positioning groove 508. The inner side of the plug-in positioning groove 508 is fixed with a closed cross plug block 509. The closed cross plug Block 509 is inserted into the interior of the heat dissipation hollow tube 410 and the outer edge is in contact with the inner wall of the heat dissipation hollow tube 410. The closed cross plug-in block 509 is inserted into the end of the heat dissipation hollow tube 410 to divide the interior of the heat dissipation hollow tube 410 into four areas. The closed partition 506 is used to completely isolate the adjacent lithium battery installation compartments 503, so that the heat generated by the single lithium battery 504 inside the lithium battery installation compartment 503 will not enter the interior of the adjacent lithium battery installation compartment 503, but will enter the interior of the heat dissipation hollow tube 410 independently.

[0041] Working principle: When the lithium battery unit in a closed structure is charging and discharging, the single lithium battery 504 inside the lithium battery unit generates heat. The heat generated by the single lithium battery 504 flows in the lithium battery installation compartment 503, and the heat enters the heat dissipation groove 507 from the lithium battery installation compartment 503. After entering the heat dissipation groove 507, the heat enters the inner side of the heat dissipation hollow tube 410 through the gap at the contact point between the end of the heat dissipation hollow tube 410 and the third docking branch pipe 406. Since the interior of the heat dissipation hollow tube 410 is divided into four areas by the closed cross plug block 509, the heat from adjacent lithium battery installation compartments 503 independently enters the heat dissipation hollow tube 410 and then mixes. There is no heat exchange between adjacent lithium battery installation compartments 503.

[0042] After the heat enters the heat dissipation hollow tube 410, it is transferred to the heat dissipation plate 409 and absorbed by the heat dissipation plate 409. At this time, the power of the first circulating cooling pump 12 and the second circulating cooling pump 13 are turned on and started. The first circulating cooling pump 12 extracts the coolant stored in the coolant storage tank 1 through the coolant outlet pipe 6. The extracted coolant enters the cooling protection liquid capsule 401 through the coolant inlet pipe 8. The coolant fills the cooling protection liquid capsule 401. During the filling process, the coolant absorbs the heat transferred to the cooling protection liquid capsule 401 by the single lithium battery 504 through the battery wrapping shell 501. After the cooling protection liquid capsule 401 is filled with coolant, the coolant return pipe 9 extracts the coolant in the cooling protection liquid capsule 401 and sends it back to the coolant storage tank 1 through the second circulating cooling pump 13 and the coolant recovery pipe 7, thereby realizing the circulation of the coolant, thereby dissipating heat inside the closed structure lithium battery unit;

[0043] While the coolant inlet pipe 8 is transporting cooling, part of the coolant enters the bottom buffer water bag 403 through the fourth docking branch pipe 408 and the second docking branch pipe 407. The coolant flows inside the bottom buffer water bag 403 and absorbs and takes away the heat of the heat sink 409 in contact with the bottom buffer water bag 403. The coolant enters the top buffer water bag 402 from the bottom buffer water bag 403 through the connecting water pipe 404. When the coolant flows inside the top buffer water bag 402, it absorbs and takes away the heat of the heat sink 409 in contact with the top buffer water bag 402. In this way, the heat accumulated inside the lithium battery installation compartment 503 is dissipated through the heat sink 409 and the heat dissipation hollow tube 410. The coolant that absorbs heat enters the coolant return pipe 9 through the first docking branch pipe 405 and the third docking branch pipe 406 and returns to the coolant storage tank 1. Without destroying the sealing of the closed structure lithium battery cell, the heat dissipation inside the closed structure lithium battery cell is accelerated to avoid overheating inside the closed structure lithium battery cell and affect the safe operation of the lithium battery.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A closed structure lithium battery cell with a cooling closed compartment, comprising a coolant storage tank (1), a battery pack upper shell (2) and a battery pack lower shell (3), characterized in that: The battery pack upper shell (2) and the battery pack lower shell (3) are symmetrical in the upper and lower parts and are connected by bolts. The bottom surface of the battery pack upper shell (2) and the upper surface of the battery pack lower shell (3) are both provided with a sealing slot (11), and a sealing ring (14) is clamped inside the sealing slot (11). A plurality of lithium battery closed compartments (5) are distributed in a rectangular array between the battery pack upper shell (2) and the battery pack lower shell (3). A lithium battery cooling compartment (4) is provided between the lithium battery closed compartment (5) and the battery pack upper shell (2) and the battery pack lower shell (3). The upper surface of the battery pack upper shell (2) and the bottom surface of the battery pack lower shell (3) are both provided with a water pipe clamping slot (10). A coolant outlet pipe (6) and a coolant recovery pipe (7) are fixed through the coolant storage box (1) toward the end of the battery pack upper shell (2) and the battery pack lower shell (3), a first circulating cooling pump (12) is fixed to the end of the coolant outlet pipe (6), a coolant inlet pipe (8) is fixed to the output end of the first circulating cooling pump (12), the coolant inlet pipe (8) is clamped to the inner side of the water pipe clamping groove (10) at the bottom of the battery pack lower shell (3), and the coolant inlet pipe (8) is away from the end of the first circulating cooling pump (12). The coolant return pipe (9) is fixed to the input end of the second circulating cooling pump (13), and the coolant return pipe (9) is clamped on the inner side of the water pipe clamping groove (10) at the top of the battery pack upper shell (2), and the end of the coolant return pipe (9) away from the second circulating cooling pump (13) passes through the battery pack upper shell (2) and is fixed to the top of the lithium battery cooling compartment (4); The lithium battery enclosed compartment (5) comprises a battery encapsulating shell (501), a lithium battery separator (502) being detachably mounted inside the battery encapsulating shell (501), the lithium battery separator (502) dividing the interior of the battery encapsulating shell (501) into a plurality of lithium battery mounting compartments (503), and a single lithium battery (504) being mounted inside the lithium battery mounting compartments (503); The upper and lower surfaces of the lithium battery separator (502) are both provided with a plurality of plug holes (505) distributed in a rectangular array, a heat dissipation groove (507) is provided between the plug holes (505) distributed on the upper and lower surfaces of the lithium battery separator (502), and the heat dissipation groove (507) is communicated with the lithium battery installation compartment (503); The bottom surface of the top buffer water bag (402) and the upper surface of the bottom buffer water bag (403) are both inlaid with heat dissipation plates (409), and a plurality of heat dissipation hollow tubes (410) are fixed in a rectangular array on the surface of the heat dissipation plates (409), and the heat dissipation hollow tubes (410) pass through the plug hole (505) and extend to the inside of the heat dissipation groove (507); A closed partition (506) is provided on the inner side of the heat dissipation groove (507), and the closed partition (506) is fixed inside the lithium battery partition (502) to separate adjacent lithium battery installation compartments (503); The upper surface and the bottom surface of the closed partition (506) are both provided with a plurality of plug-in positioning grooves (508) distributed in a rectangular array, and the number of the plug-in positioning grooves (508) is the same as that of the plug-in holes (505) and they correspond one to one; The bottom end of the heat dissipation hollow tube (410) extends to the inside of the plug-in positioning groove (508), and a closed cross plug-in block (509) is fixed on the inside of the plug-in positioning groove (508). The closed cross plug-in block (509) is plugged into the inside of the heat dissipation hollow tube (410) and the outer edge is in contact with the inner wall of the heat dissipation hollow tube (410).

2. A closed structure lithium battery cell with a cooling closed compartment according to claim 1, characterized in that: The lithium battery cooling compartment (4) includes a cooling protection liquid capsule (401), the interior of the cooling protection liquid capsule (401) is hollow and communicates with a coolant return pipe (9) and a coolant inlet pipe (8), a plurality of top buffer water capsules (402) are distributed in a rectangular array on the top of the cooling protection liquid capsule (401), a plurality of bottom buffer water capsules (403) are distributed in a rectangular array on the bottom of the cooling protection liquid capsule (401), and a connecting water pipe (404) is fixed on the same side of the upper and lower adjacent top buffer water capsules (402) and bottom buffer water capsules (403), and the end of the connecting water pipe (404) is communicated with the top buffer water capsule (402) and the bottom buffer water capsule (403).

3. A closed structure lithium battery cell with a cooling closed compartment according to claim 2, characterized in that: A third docking branch pipe (406) with two overlapping axes is fixed on the outer side of the end portion of the cooling liquid return pipe (9) connected to the cooling protection liquid bag (401), and a plurality of first docking branch pipes (405) are fixed on both sides of the third docking branch pipe (406), and one end of the first docking branch pipe (405) is fixed to the top buffer water bag (402) and communicated with the interior of the top buffer water bag (402).

4. A closed structure lithium battery cell with a cooling closed compartment according to claim 3, characterized in that: A fourth docking branch pipe (408) with two overlapping axes is fixed on the outer side of the end portion where the cooling liquid inlet pipe (8) is connected to the cooling protection liquid bag (401), and a plurality of second docking branches (407) are fixed on both sides of the fourth docking branch pipe (408), and one end of the second docking branch pipe (407) is fixed to the bottom buffer water bag (403) and communicated with the interior of the bottom buffer water bag (403).

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