A uniform heating type liquid cooling system of a power battery box array

Abstract

The application discloses a heat equalizing type liquid cooling system of a power battery box array, which comprises liquid cooling battery boxes arranged in a linear array, a cold oil introduction pipe, a hot oil discharge pipe and a transition pipe; cooling liquid from the cold oil introduction pipe flows into one end of the transition pipe after sequentially flowing through left parts of the liquid cooling battery boxes, and cooling liquid discharged from the other end of the transition pipe sequentially flows through right parts of the liquid cooling battery boxes and is discharged through the hot oil discharge pipe; the problem that the heat absorption efficiency gradually decreases on the extension path of the cooling path is solved.

Description

Technical Field

[0001] This invention belongs to the field of battery cooling. Background Technology

[0002] As the coolant in a liquid-cooled power battery system flows along the cooling channel, it gradually absorbs heat, causing its temperature to rise along the channel's path. This results in a gradual decrease in the coolant's heat absorption efficiency along the cooling channel's path. Consequently, cells closer to the liquid inlet experience better cooling, while cells further away from the liquid inlet experience poorer cooling. This leads to a gradual decrease in the coolant's heat absorption efficiency along the extended cooling path. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a heat-spreading liquid cooling system for power battery box arrays, which solves the problem of the gradual decrease in heat absorption efficiency of the coolant along the extended path of the cooling path.

[0004] Technical solution: To achieve the above objective, the present invention provides a heat-spreading liquid cooling system for a power battery box array, comprising liquid-cooled battery boxes arranged in a linear array, a cold oil inlet pipe, a hot oil outlet pipe, and a transition pipe; coolant from the cold oil inlet pipe flows sequentially through the left side of each liquid-cooled battery box and then into one end of the transition pipe, and coolant discharged from the other end of the transition pipe flows sequentially through the right side of each liquid-cooled battery box and then is discharged through the hot oil outlet pipe.

[0005] Furthermore, the transition tube is located at one end of the linear array structure formed by several liquid-cooled battery boxes, while the cold oil inlet pipe and the hot oil outlet pipe are located at the other end of the linear array structure formed by several liquid-cooled battery boxes.

[0006] Furthermore, each liquid-cooled battery box has an inlet pipe (a) and an outlet pipe (a) coaxially and integrally installed on the left side, near the cold oil inlet pipe and away from the cold oil inlet pipe, respectively.

[0007] Each liquid-cooled battery box has a b-inlet pipe and a b-outlet pipe coaxially and integrally installed on the right side, at the end furthest from the hot oil outlet pipe and at the end closest to the hot oil outlet pipe, respectively.

[0008] Furthermore, the outlet pipe (a) and inlet pipe (b) of the liquid-cooled battery box closest to the transition tube in the array of several liquid-cooled battery boxes arranged in a straight line are respectively connected to both ends of the transition tube.

[0009] The liquid-cooled battery boxes arranged in a linear array are connected to a cold oil inlet pipe and a hot oil outlet pipe, respectively, through the inlet pipe (a) and outlet pipe (b) of the liquid-cooled battery box furthest from the transition tube.

[0010] In a series of liquid-cooled battery boxes arranged in a straight line array, except for the two liquid-cooled battery boxes furthest from and closest to the transition tube, the liquid outlet pipe (a) and liquid inlet pipe (b) of any liquid-cooled battery box are integrally connected to the liquid inlet pipe (a) and liquid outlet pipe (b) of an adjacent liquid-cooled battery box on the side closest to the transition tube; the liquid inlet pipe (a) and liquid outlet pipe (b) of any liquid-cooled battery box are integrally connected to the liquid outlet pipe (a) and liquid inlet pipe (b) of an adjacent liquid-cooled battery box on the side furthest from the transition tube.

[0011] Furthermore, several columnar battery cells are fixedly arranged in an array inside the liquid-cooled battery box, and the gaps between each columnar battery cell are filled with heat-equalizing oil, so that each columnar battery cell inside the liquid-cooled battery box is completely immersed in heat-equalizing oil.

[0012] Furthermore, the cylindrical cell units within the liquid-cooled battery box include several a cylindrical cell units and several b cylindrical cell units.

[0013] Furthermore, a number of α-cylindrical cell units are arranged in a linear array centered along the length of the liquid-cooled battery box. A left-hand rotating heat exchange cylinder running along the axis is arranged parallel to the left side of the leftmost α-cylindrical cell unit in the linear array; a right-hand rotating heat exchange cylinder running along the axis is arranged parallel to the right side of the rightmost α-cylindrical cell unit in the linear array.

[0014] Furthermore, the upper and lower ends of the left rotary heat exchanger are connected to the a liquid outlet pipe and the a liquid inlet pipe via sealed bearings, respectively, and rotate coaxially. The upper and lower ends of the right rotary heat exchanger are connected to the b liquid inlet pipe and the b liquid outlet pipe via sealed bearings, respectively, and rotate coaxially.

[0015] Furthermore, the inner wall of the left rotary heat exchanger is provided with a left helical hydraulic drive blade. When liquid flows through the coaxial left heat exchange channel in the left rotary heat exchanger along the axial direction, the flowing liquid pushes the left helical hydraulic drive blade, causing the left rotary heat exchanger to rotate along the axial direction.

[0016] The inner wall of the right-hand rotating heat exchanger is equipped with right-hand spiral hydraulic drive blades. When liquid flows through the right heat exchange channel coaxially through the right rotating heat exchanger, the flowing liquid pushes the right-hand spiral hydraulic drive blades, causing the right rotating heat exchanger to rotate along the axis.

[0017] Furthermore, the helical direction of the left-hand helical hydraulic drive blade is opposite to that of the right-hand helical hydraulic drive blade;

[0018] Several b-shaped columnar battery cells are arranged in a waist-shaped closed-loop array outside the linear array structure jointly formed by the left rotating heat exchange cylinder, the right rotating heat exchange cylinder, and several a-shaped columnar battery cells;

[0019] A waist-shaped closed-loop heat exchange oil flow gap is formed between the "linear array structure" composed of the left rotating heat exchange cylinder, the right rotating heat exchange cylinder, and several a-shaped columnar battery cells and the "waist-shaped closed-loop enclosed array structure" composed of several b-shaped columnar battery cells. A waist-shaped closed-loop heat exchange oil drive belt is provided inside the liquid-cooled battery box, extending along the path of the waist-shaped closed-loop heat exchange oil flow gap. The inner arc surfaces at both ends of the waist-shaped closed-loop heat exchange oil drive belt are tightly attached to the outer cylinder surfaces of the left rotating heat exchange cylinder and the right rotating heat exchange cylinder, respectively.

[0020] A liquid-conducting void (a) is formed between the inner wall of the waist-shaped closed-loop heat-spreading oil drive belt and the outer wall of each a-column battery cell unit; a liquid-conducting void (b) is formed between the outer wall of the waist-shaped closed-loop heat-spreading oil drive belt and the outer wall of each b-column battery cell unit.

[0021] Beneficial effects: The heat absorption of the left and right rotating heat exchange cylinders in any one of the liquid-cooled battery boxes of the present invention forms a high-low compensation effect, so the total heat absorption in several liquid-cooled battery boxes from bottom to top is relatively consistent, eliminating the problem of the total heat absorption of several liquid-cooled battery boxes decreasing successively from bottom to top due to the gradual decrease in heat absorption efficiency of the cooling oil as its flow path increases; thus, this structure solves the problem of uneven total heat absorption; at the same time, the waist-shaped closed-loop heat homogenizing oil drive belt drives the heat homogenizing oil in the liquid-cooled battery box to circulate along the closed-loop path of the waist-shaped closed-loop heat homogenizing oil flow gap under the action of liquid viscosity, thereby eliminating the problem of unbalanced left and right heat absorption efficiency in a single liquid-cooled battery box. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the device;

[0023] Figure 2 This is a schematic diagram of a single liquid-cooled battery box.

[0024] Figure 3 for Figure 2 An enlarged view of mark 20;

[0025] Figure 4 This is a cross-sectional view of a single liquid-cooled battery box.

[0026] Figure 5 for Figure 4 Top view;

[0027] Figure 6 In order to be in Figure 5 The schematic diagram of the waist-shaped closed-loop homogenizing oil flow gap behind the waist-shaped closed-loop homogenizing oil drive belt has been omitted. Detailed Implementation

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] As attached Figures 1 to 6 A heat-spreading liquid cooling system for a power battery box array includes liquid-cooled battery boxes 3 arranged in a straight array, a cold oil inlet pipe 1, a hot oil outlet pipe 2, and a transition pipe 6; coolant from the cold oil inlet pipe 1 flows sequentially through the left side of each liquid-cooled battery box 3 and then into one end of the transition pipe 6, and coolant discharged from the other end of the transition pipe 6 flows sequentially through the right side of each liquid-cooled battery box 3 and then is discharged through the hot oil outlet pipe 2.

[0030] like Figure 1 As shown, the transition pipe 6 is located at one end of the linear array structure formed by several liquid-cooled battery boxes 3, and the cold oil inlet pipe 1 and the hot oil outlet pipe 2 are located at the other end of the linear array structure formed by several liquid-cooled battery boxes 3.

[0031] Each liquid-cooled battery box 3 has an a liquid inlet pipe 4a and an a liquid outlet pipe 5a coaxially and integrally arranged on the left side near the cold oil inlet pipe 1 and the side away from the cold oil inlet pipe 1, respectively; each liquid-cooled battery box 3 has a b liquid inlet pipe 4b and a b liquid outlet pipe 5b coaxially and integrally arranged on the right side far from the hot oil outlet pipe 2 and near the hot oil outlet pipe 2, respectively; the a liquid outlet pipe 5a and the b liquid inlet pipe 4b of the liquid-cooled battery box 3 closest to the transition pipe 6 among several liquid-cooled battery boxes 3 arranged in a linear array are respectively connected to both ends of the transition pipe 6; the a liquid inlet pipe 4a and the b liquid outlet pipe 5b of the liquid-cooled battery box 3 far from the transition pipe 6 among several liquid-cooled battery boxes 3 arranged in a linear array are respectively connected to the cold oil inlet pipe 1 and the hot oil outlet pipe 2.

[0032] Among a number of liquid-cooled battery boxes 3 arranged in a straight line array, except for the two liquid-cooled battery boxes 3 that are furthest away from and closest to the transition tube 6, the liquid outlet pipe 5a and the liquid inlet pipe 4b of any liquid-cooled battery box 3 are respectively integrally connected to the liquid inlet pipe 4a and the liquid outlet pipe 5b of an adjacent liquid-cooled battery box 3 on the side closest to the transition tube 6; the liquid inlet pipe 4a and the liquid outlet pipe 5b of any liquid-cooled battery box 3 are respectively integrally connected to the liquid outlet pipe 5a and the liquid inlet pipe 4b of an adjacent liquid-cooled battery box 3 on the side far from the transition tube 6.

[0033] like Figure 2 As shown in Figures 3, 4, and 5, a number of columnar battery cells 8 are fixedly arranged in an array inside the liquid-cooled battery box 3. The gaps 30 between each columnar battery cell 8 inside the liquid-cooled battery box 3 are filled with heat-equalizing oil, so that each columnar battery cell 8 inside the liquid-cooled battery box 3 is completely immersed in the heat-equalizing oil.

[0034] The columnar cell unit 8 inside the liquid-cooled battery box 3 includes several columnar cell units 8a and several columnar cell units 8b. The columnar cell units 8a are arranged in a straight line along the length of the liquid-cooled battery box 3. The leftmost columnar cell unit 8a in the straight line array has a left-hand rotating heat exchange cylinder 14 that runs through the axis on its left side. The upper and lower ends of the left-hand rotating heat exchange cylinder 14 are connected to the liquid outlet pipe 5a and the liquid inlet pipe 4a respectively through the sealed bearing 9. The inner wall of the left-hand rotating heat exchange cylinder 14 is provided with a left-hand spiral hydraulic drive blade 12. When liquid flows through the left heat exchange channel 10 that runs through the left axis in the left-hand rotating heat exchange cylinder 14, the liquid pushes the left-hand spiral hydraulic drive blade 12, causing the left-hand rotating heat exchange cylinder 14 to rotate along the axis.

[0035] A right-hand rotating heat exchanger 15 is arranged parallel to the right side of the rightmost columnar cell unit 8a in the linear array, running along the axis. The upper and lower ends of the right-hand rotating heat exchanger 15 are connected to the liquid inlet pipe 4b and the liquid outlet pipe 5b respectively through sealed bearings 9. A right-hand spiral hydraulic drive blade 13 is spirally arranged on the inner wall of the right-hand rotating heat exchanger 15. There are many forms of hydraulic drive blades, such as propeller blades. When liquid flows through the right heat exchange channel 11 that runs coaxially through the right rotating heat exchanger 15 along the axis, the flowing liquid pushes the right-hand spiral hydraulic drive blade 13, causing the right rotating heat exchanger 15 to rotate along the axis.

[0036] The helical direction of the left-hand helical hydraulic drive blade 12 is opposite to that of the right-hand helical hydraulic drive blade 13.

[0037] like Figure 4 and 5 As shown, several columnar battery cells 8b are arranged in a waist-shaped closed-loop array outside the linear array structure jointly formed by the left rotating heat exchange cylinder 14, the right rotating heat exchange cylinder 15, and several columnar battery cells 8a.

[0038] A waist-shaped closed-loop heat exchange oil flow gap 7 is formed between the "linear array structure" composed of the left rotating heat exchange cylinder 14, the right rotating heat exchange cylinder 15, and several a-shaped columnar battery cell units 8a, and the "waist-shaped closed-loop enclosed array structure" composed of several b-shaped columnar battery cell units 8b. Figure 6 As shown, the liquid-cooled battery box 3 is equipped with a waist-shaped closed-loop heat-spreading oil drive belt 16 extending along the path of the waist-shaped closed-loop heat-spreading oil flow gap 7, as... Figure 5As shown, the inner arc surfaces at both ends of the waist-shaped closed-loop heat exchanger oil drive belt 16 are tightly attached to the outer cylinder surfaces of the left rotating heat exchanger 14 and the right rotating heat exchanger 15, respectively; a liquid guiding gap 18 is formed between the inner wall surface of the waist-shaped closed-loop heat exchanger oil drive belt 16 and the outer wall of each a columnar battery cell 8a; b liquid guiding gap 17 is formed between the outer wall surface of the waist-shaped closed-loop heat exchanger oil drive belt 16 and the outer wall of each b columnar battery cell 8b; when the left rotating heat exchanger 14 and the right rotating heat exchanger 15 rotate synchronously, the waist-shaped closed-loop heat exchanger oil drive belt 16 moves linearly along its own extension path under the drive of the left rotating heat exchanger 14 and the right rotating heat exchanger 15; thereby, under the action of liquid viscosity, the waist-shaped closed-loop heat exchanger oil drive belt 16 drives the heat exchanger oil in the liquid-cooled battery box 3 to circulate along the closed-loop path of the waist-shaped closed-loop heat exchanger oil flow gap 7.

[0039] The waist-shaped closed-loop heat-spreading oil drive belt 16 in this case is a taut closed-loop nylon fiber belt. In order to improve the viscosity and transport capacity of the liquid, the inner and outer surfaces of the waist-shaped closed-loop heat-spreading oil drive belt 16 are both made of uniform array pit structure, uniform array porous structure, or surface roughening treatment.

[0040] The heat-equalizing oil in the liquid-cooled battery box 3 in this case is electrical insulating oil; the liquid-cooled battery box 3 is equipped with an elastic pressure compensation structure, such as an elastic rubber airbag or other pressure buffer device, to resist thermal expansion and contraction; the left rotating heat exchange cylinder 14 and the right rotating heat exchange cylinder 15 are both made of thermally conductive metals, such as copper alloys.

[0041] Working method: During the operation of the liquid-cooled battery box 3, due to the thermal effect of the columnar battery cell units 8, each columnar battery cell unit 8 gradually releases heat to the homogenizing oil inside the liquid-cooled battery box 3.

[0042] Liquid flow path: Under the action of the external circulation pump, the low-temperature coolant enters from the cold oil inlet pipe 1 and flows through the left rotary heat exchanger 14 on the left side of each liquid-cooled battery box 3 before flowing into one end of the transition pipe 6. The coolant discharged from the other end of the transition pipe 6 flows through the right rotary heat exchanger 15 on the right side of each liquid-cooled battery box 3 before being discharged through the hot oil outlet pipe 2. During the process of the coolant flowing through each left rotary heat exchanger 14, the left rotary heat exchanger 14 remains at a low temperature, thereby continuously absorbing the heat from the heat-equalizing oil on the left side of the inner cavity of the liquid-cooled battery box 3. During the process of the coolant flowing through each right rotary heat exchanger 15, the right rotary heat exchanger 15 remains at a low temperature, thereby continuously absorbing the heat from the heat-equalizing oil on the right side of the inner cavity of the liquid-cooled battery box 3.

[0043] In the aforementioned liquid flow path, because the coolant gradually absorbs heat along the path, its temperature gradually increases with the increase of its flow distance. This causes the coolant's heat absorption efficiency to gradually decrease as its flow distance increases. Based on this characteristic, from... Figure 1 From the perspective of [the relevant information], the heat absorption efficiency of the left-hand rotating heat exchanger 14 in each liquid-cooled battery box 3 is higher than that of the right-hand rotating heat exchanger 15. The heat absorption efficiency of the left-hand rotating heat exchanger 14 in several liquid-cooled battery boxes 3 decreases successively from bottom to top, while the heat absorption efficiency of the right-hand rotating heat exchanger 15 in several liquid-cooled battery boxes 3 increases successively from bottom to top. The left-hand rotating heat exchanger 14 and the right-hand rotating heat exchanger 15 at both ends of the same liquid-cooled battery box 3 are at the same height, thus ensuring that the heat absorption efficiency of the left-hand rotating heat exchanger 14 in any liquid-cooled battery box 3 is [higher than that of the right-hand rotating heat exchanger 15]. The heat absorption of the heat exchange cylinder 14 and the right-hand rotating heat exchange cylinder 15 creates a high-low compensation effect, so the total heat absorption in the liquid-cooled battery boxes 3 from bottom to top is relatively consistent, eliminating the problem that the total heat absorption of the liquid-cooled battery boxes 3 decreases from bottom to top due to the gradual decrease in heat absorption efficiency of the cooling oil as its flow path increases; it can be seen that this structure solves the problem of uneven total heat absorption, but from the perspective of the inside of a single liquid-cooled battery box 3, the left and right heat absorption efficiencies within a single liquid-cooled battery box 3 are unbalanced;

[0044] In this design, when liquid flows through the coaxially connected left heat exchange channel 10 within the left rotary heat exchange cylinder 14 along the axial direction, the flowing liquid pushes the left helical hydraulic drive blade 12, causing the left rotary heat exchange cylinder 14 to rotate along the axial direction. Similarly, when liquid flows through the coaxially connected right heat exchange channel 11 within the right rotary heat exchange cylinder 15 along the axial direction, the flowing liquid pushes the right helical hydraulic drive blade 13, causing the right rotary heat exchange cylinder 15 to rotate along the axial direction. Since the flow directions of the liquids in the left rotary heat exchange cylinder 14 and the right heat exchange channel 11 are opposite, and the helical direction of the left helical hydraulic drive blade 12 is... The spiral direction of the right-hand helical hydraulic drive blade 13 is opposite to that of the left-hand rotating heat exchanger 14 and the right-hand rotating heat exchanger 15. Therefore, the rotation direction of the left-hand rotating heat exchanger 14 and the right-hand rotating heat exchanger 15 is the same, so that the waist-shaped closed-loop heat homogenizing oil drive belt 16 moves linearly along its own extension path under the drive of the left-hand rotating heat exchanger 14 and the right-hand rotating heat exchanger 15. Thus, under the action of liquid viscosity, the waist-shaped closed-loop heat homogenizing oil drive belt 16 drives the heat homogenizing oil in the liquid-cooled battery box 3 to circulate along the closed-loop path of the waist-shaped closed-loop heat homogenizing oil flow gap 7, thereby eliminating the problem of unbalanced left and right heat absorption efficiency in a single liquid-cooled battery box 3.

[0045] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A heat-spreading liquid cooling system for a power battery box array, characterized in that: It includes liquid-cooled battery boxes (3) arranged in a straight array, cold oil inlet pipe (1), hot oil outlet pipe (2) and transition pipe (6); the coolant from the cold oil inlet pipe (1) flows through the left side of each liquid-cooled battery box (3) and then flows into one end of the transition pipe (6); the coolant from the other end of the transition pipe (6) flows through the right side of each liquid-cooled battery box (3) and then is discharged through the hot oil outlet pipe (2); The transition tube (6) is located at one end of the linear array structure formed by several liquid-cooled battery boxes (3), and the cold oil inlet pipe (1) and the hot oil outlet pipe (2) are located at the other end of the linear array structure formed by several liquid-cooled battery boxes (3). Each liquid-cooled battery box (3) has an a liquid inlet pipe (4a) and an a liquid outlet pipe (5a) coaxially and integrally arranged on the left side near the cold oil inlet pipe (1) and the right side away from the cold oil inlet pipe (1); each liquid-cooled battery box (3) has a b liquid inlet pipe (4b) and a b liquid outlet pipe (5b) coaxially and integrally arranged on the right side away from the hot oil outlet pipe (2) and the right side near the hot oil outlet pipe (2). The liquid-cooled battery box (3) has a number of columnar battery cell units (8) arranged in an array. The gaps (30) between each columnar battery cell unit (8) in the liquid-cooled battery box (3) are filled with heat-equalizing oil, so that each columnar battery cell unit (8) in the liquid-cooled battery box (3) is completely immersed in heat-equalizing oil. The upper and lower ends of the left rotary heat exchanger (14) are connected to the a liquid outlet pipe (5a) and the a liquid inlet pipe (4a) respectively by means of a sealed bearing (9); the upper and lower ends of the right rotary heat exchanger (15) are connected to the b liquid inlet pipe (4b) and the b liquid outlet pipe (5b) respectively by means of a sealed bearing (9). The inner wall of the left rotating heat exchange cylinder (14) is provided with a left spiral hydraulic drive blade (12). When the liquid flows through the left heat exchange channel (10) that is coaxially connected in the left rotating heat exchange cylinder (14) along the axial direction, the liquid flows through and pushes the left spiral hydraulic drive blade (12), causing the left rotating heat exchange cylinder (14) to rotate along the axial direction. The inner wall of the right rotating heat exchange cylinder (15) is provided with a right spiral hydraulic drive blade (13). When the liquid flows through the right heat exchange channel (11) that is coaxially connected inside the right rotating heat exchange cylinder (15) along the axial direction, the liquid flows through and pushes the right spiral hydraulic drive blade (13), causing the right rotating heat exchange cylinder (15) to rotate along the axial direction. The helical direction of the left-hand helical hydraulic drive blade (12) is opposite to that of the right-hand helical hydraulic drive blade (13); The inner arc surfaces at both ends of the waist-shaped closed-loop heat exchanger belt (16) are tightly attached to the outer surfaces of the left rotating heat exchanger (14) and the right rotating heat exchanger (15), respectively.

2. The heat-spreading liquid cooling system for a power battery box array according to claim 1, characterized in that: The liquid-cooled battery boxes (3) arranged in a linear array have their outlet pipe (5a) and inlet pipe (4b) connected to the two ends of the transition pipe (6). The liquid-cooled battery box (3) furthest from the transition tube (6) among several liquid-cooled battery boxes (3) arranged in a straight line array has its inlet pipe (4a) and outlet pipe (5b) connected to the cold oil inlet pipe (1) and the hot oil outlet pipe (2), respectively. Among the liquid-cooled battery boxes (3) arranged in a linear array, except for the two liquid-cooled battery boxes (3) that are furthest from and closest to the transition tube (6), the a-outlet pipe (5a) and b-inlet pipe (4b) of any liquid-cooled battery box (3) are respectively integrally connected to the a-inlet pipe (4a) and b-outlet pipe (5b) of an adjacent liquid-cooled battery box (3) on the side closest to the transition tube (6); the a-inlet pipe (4a) and b-outlet pipe (5b) of any liquid-cooled battery box (3) are respectively integrally connected to the a-outlet pipe (5a) and b-inlet pipe (4b) of an adjacent liquid-cooled battery box (3) on the side far from the transition tube (6).

3. The heat-spreading liquid cooling system for a power battery box array according to claim 1, characterized in that: The cylindrical cell unit (8) inside the liquid-cooled battery box (3) includes several a cylindrical cell units (8a) and several b cylindrical cell units (8b).

4. The heat-spreading liquid cooling system for a power battery box array according to claim 3, characterized in that: A number of columnar battery cells (8a) are arranged in a straight line along the length of the liquid-cooled battery box (3). A left-hand rotating heat exchange cylinder (14) is arranged parallel to the left side of the leftmost columnar battery cell (8a) in the straight line array; a right-hand rotating heat exchange cylinder (15) is arranged parallel to the right side of the rightmost columnar battery cell (8a) in the straight line array.

5. The heat-spreading liquid cooling system for a power battery box array according to claim 1, characterized in that: Several b-shaped columnar battery cells (8b) are arranged in a waist-shaped closed-loop array outside the linear array structure formed by the left rotating heat exchange cylinder (14), the right rotating heat exchange cylinder (15) and several a-shaped columnar battery cells (8a); A waist-shaped closed-loop heat exchange oil flow gap (7) is formed between the "linear array structure" composed of the left rotating heat exchange cylinder (14), the right rotating heat exchange cylinder (15) and several a columnar battery cell units (8a) and the "waist-shaped closed-loop enclosed array structure" composed of several b columnar battery cell units (8b). The liquid-cooled battery box (3) is provided with a waist-shaped closed-loop heat exchange oil drive belt (16) extending along the path of the waist-shaped closed-loop heat exchange oil flow gap (7). A liquid-conducting gap (18) is formed between the inner wall of the waist-shaped closed-loop heat-spreading oil drive belt (16) and the outer wall of each a columnar cell unit (8a); a liquid-conducting gap (17) is formed between the outer wall of the waist-shaped closed-loop heat-spreading oil drive belt (16) and the outer wall of each b columnar cell unit (8b).

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