A liquid cooling assembly for a power battery pack

Abstract

The utility model discloses a kind of liquid cooling components applied to power battery field for power battery package, including two heat conduction plates being penetrated by multiple electric cores, multiple convection holes are opened in two heat conduction plates, multiple convection holes are respectively distributed with multiple electric cores staggered, heat conduction plate is hollow structure, and the side end of two heat conduction plates mutually away is fixedly connected with the liquid guide pipe communicated with its inside, multiple longitudinal flow cylinders of matrix distribution are fixedly connected between two heat conduction plates, multiple longitudinal flow cylinders are respectively set in multiple electric cores outside battery package, longitudinal flow cylinder includes two self-adhesion half rings, self-adhesion half ring is also hollow structure, and the both ends of self-adhesion half ring are respectively communicated with two heat conduction plate inside, through the flow channel setting in heat conduction plate, and cooperate the effect of longitudinal flow cylinder that cooling liquid can be guided synchronously, effectively solve the problem of uneven temperature distribution caused by flow channel being serpentine or S shape in prior art.

Description

Technical Field

[0001] This utility model relates to the field of power batteries, and in particular to a liquid cooling component for a power battery pack. Background Technology

[0002] The power battery pack is the core component of an electric vehicle, and its performance, lifespan, and safety are highly dependent on the operating temperature. Ideally, the battery pack should operate within a suitable temperature range (typically 15°C to 35°C), and the temperature difference between the individual cells within the pack should be as small as possible (ideally controlled within 5°C).

[0003] In the prior art, the temperature control method of battery packs is generally liquid cooling. The channel is usually set in the mounting plate (heat conduction plate) at the end of the battery module, and is generally set in a serpentine or S-shape. It only dissipates heat at the end of the cell. For example, the liquid cooling plate and battery pack disclosed in Chinese patent CN114927793A. However, such flow channels are generally very long. The coolant needs to pass through the long flow channel before being discharged, resulting in a large temperature difference between the inlet and outlet of the coolant. Moreover, since it only dissipates heat at the end of the cell, the temperature control effect on the multiple densely distributed cells in the battery pack is poor. Local heat accumulation is likely to occur, which is not conducive to uniform temperature distribution. Utility Model Content

[0004] 1. Technical problems to be solved

[0005] The core of this invention lies in the use of a through-flow channel within the heat-conducting plate to solve the problem of uneven temperature distribution caused by serpentine or S-shaped flow channels in existing technologies. Simultaneously, the longitudinal flow tube can rotate at small angles locally and can radially adapt to the battery cell, effectively ensuring uniform temperature control of the battery cell.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A liquid cooling assembly for a power battery pack includes two heat-conducting plates through which multiple battery cells are movably penetrated. Multiple convection holes are drilled on both heat-conducting plates, staggered with the multiple battery cells. The heat-conducting plates are hollow, and liquid-conducting pipes communicating with their interiors are fixedly connected to the opposite ends of the two heat-conducting plates. Multiple longitudinal flow tubes arranged in a matrix are fixedly connected between the two heat-conducting plates. These longitudinal flow tubes are respectively fitted around the multiple battery cells inside the battery pack. Each longitudinal flow tube includes two self-adhesive semi-rings, which are also hollow, with both ends communicating with the interiors of the two heat-conducting plates. Multiple evenly distributed liquid-conducting holes are drilled on the inner wall of the self-adhesive semi-rings facing the battery cells. Thermally conductive springs are also provided on the inner wall of the self-adhesive semi-rings facing the battery cells, completely covering the multiple liquid-conducting holes, and the edges of the thermally conductive springs are sealed and fixed to the self-adhesive semi-rings.

[0009] Furthermore, two liquid guide tubes are located near the upper and lower ends of the two heat-conducting plates, respectively, with the liquid guide tube near the lower end used for liquid inlet and the other liquid guide tube used for liquid outlet.

[0010] Furthermore, the thermally conductive spring has an elastic sealing structure, and neither of the two self-adhesive semi-rings comes into contact with the outer surface of the battery cell.

[0011] Optionally, the self-adhesive semi-ring has a segmented structure. At the ends of the two heat-conducting plates that are close to each other, there are multiple corresponding limiting frames that are distributed in a matrix. The two opposing limiting frames are respectively sleeved on the outer sides of the two ends of the longitudinal flow tube. The limiting frame includes a limiting ring sleeved on the two self-adhesive semi-rings and multiple connecting rods fixedly connected between the limiting ring and the adjacent heat-conducting plate.

[0012] Furthermore, the self-adhesive semi-ring includes a micro-motion segment, two follower segments respectively fixedly connected to the ends of the two micro-motion segments, and two fixed segments respectively fixedly connected between the follower segments and the adjacent heat-conducting plate. Two sets of directional components are fixedly connected between the two sets of outer ends of the two micro-motion segments that are close to each other. Two sets of limiting rings are fixedly connected to the outer ends of the micro-motion segments, and the two limiting rings correspond to the two sets of limiting rings respectively.

[0013] Furthermore, the two sets of steering components are centrally symmetrically distributed. The steering components include a base fixedly connected to the outer end of the micro-motion section, an electric push rod fixedly connected to the outer end of the base, a rope loop fixedly connected to the outer end of another micro-motion section, and a pull rope tied between the electric push rod and the rope loop.

[0014] Furthermore, the micro-motion section and the fixed section are both rigid structures, the follower section is an elastic sealed structure, the pull rope is a flexible non-elastic structure, and the electric push rod is connected to the temperature control center signal of the battery pack.

[0015] 3. Beneficial Effects

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] (1) This solution effectively solves the problem of uneven temperature distribution caused by the serpentine or S-shaped flow channel in the prior art by setting the flow channel through the heat conduction plate and cooperating with the longitudinal flow tube that can guide the coolant flow simultaneously.

[0018] (2) The longitudinal flow tube can rotate at a small angle locally and can adapt to the battery cell in the radial direction. At abnormally high temperatures, the surface of the battery cell can be subjected to comprehensive and uniform contact heat exchange, which further improves the uniformity of temperature distribution on the battery pack. Attached Figure Description

[0019] Figure 1 This is an exploded view of the present invention;

[0020] Figure 2This is a perspective view of the present utility model;

[0021] Figure 3 This is a cross-sectional schematic diagram of the self-adhesive semi-ring of this utility model;

[0022] Figure 4 A schematic diagram of the longitudinal flow tube wrapping the battery cell for contact heat exchange and cooling according to this utility model.

[0023] Figure 5 This is a perspective view of the segmented longitudinal flow tube of this utility model;

[0024] Figure 6 This is an exploded view of the segmented longitudinal flow tube of this utility model;

[0025] Figure 7 This is a perspective view of the orientation adjustment component of this utility model;

[0026] Figure 8 This is a three-dimensional schematic diagram of the self-adhesive semi-ring of the segmented longitudinal flow tube of this utility model when it rotates at a small angle.

[0027] Explanation of the labels in the diagram:

[0028] 1. Heat-conducting plate, 101. Convection hole, 2. Liquid guide tube, 3. Longitudinal flow cylinder, 31. Self-adhesive semi-ring, 311. Micro-motion section, 312. Follow-up section, 313. Fixed section, 32. Heat-conducting spring, 301. Liquid guide hole, 41. Limiting ring, 42. Connecting rod, 401. Limiting ring, 5. Directional assembly, 51. Base, 52. Electric push rod, 53. Pull rope, 501. Rope ring. Detailed Implementation

[0029] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0030] Example 1:

[0031] Please see Figures 1-2 A liquid cooling assembly for a power battery pack includes two heat-conducting plates 1 through which multiple battery cells are movably penetrated. Each heat-conducting plate 1 has multiple convection holes 101, which are staggered with the multiple battery cells. The heat-conducting plates 1 are hollow, and liquid-conducting pipes 2 that communicate with the interior of each heat-conducting plate 1 are fixedly connected to the opposite sides of the two heat-conducting plates 1. The two liquid-conducting pipes 2 are located near the upper and lower ends of the two heat-conducting plates 1, respectively. The liquid-conducting pipe 2 near the lower end is used for liquid inlet, and the other liquid-conducting pipe 2 is used for liquid outlet.

[0032] Multiple longitudinal flow tubes 3, arranged in a matrix, are fixedly connected between two heat-conducting plates 1. These tubes 3 are respectively fitted around multiple battery cells within the battery pack. Each longitudinal flow tube 3 includes two self-adhesive semi-rings 31, which do not contact each other and form two gaps between them. The gaps form an angle of 45° with the vertical direction, and all gaps on the multiple longitudinal flow tubes 3 face the convection holes 101. In use, when coolant is introduced through the lower liquid guide pipe 2, the coolant diffuses within the corresponding heat-conducting plate 1 and then flows synchronously along the multiple longitudinal flow tubes 3 towards another heat-conducting plate 1. The coolant flows out from the upper guide tube 2. During this process, the longitudinal flow tube 3 through which the coolant flows is located just outside the battery cell, thus selectively absorbing heat from the environment surrounding multiple battery cells. Simultaneously, in conjunction with the forced convection cooling of the existing fan, the flowing air enters evenly between the two heat-conducting plates 1 along multiple convection holes 101, and then flows into the vicinity of the battery cell along the gap formed by the two self-adhesive semi-rings 31, forcibly cooling the battery cell. Combined with the effect of the longitudinal flow tube 3 in uniformly reducing the ambient temperature of the battery pack, the heat dissipation efficiency is greatly improved, effectively preventing heat retention in some battery cells. This effectively ensures the uniformity of temperature distribution among multiple battery cells.

[0033] It is worth noting that forced convection cooling by fans is an existing technology, so it will not be discussed in detail here.

[0034] like Figure 3 The self-adhesive semi-ring 31 is also a hollow structure, and both ends of the self-adhesive semi-ring 31 are connected to the interior of the two heat-conducting plates 1 respectively. The self-adhesive semi-ring 31 has multiple evenly distributed liquid guiding holes 301 drilled on the inner wall facing the battery cell. The self-adhesive semi-ring 31 is also provided with a heat-conducting spring sheet 32 ​​facing the inner wall of the battery cell. The heat-conducting spring sheet 32 ​​completely covers the multiple liquid guiding holes 301, and the edge of the heat-conducting spring sheet 32 ​​is sealed and fixed to the self-adhesive semi-ring 31. The heat-conducting spring sheet 32 ​​is an elastic sealing structure, and neither of the two self-adhesive semi-rings 31 is in contact with the outer surface of the battery cell.

[0035] During the temperature regulation of the battery pack, if the temperature of the coolant discharged from the upper liquid guide pipe 2 is high, it indicates that the battery pack temperature is relatively high or the heat dissipation efficiency is slow. In this case, the heat dissipation efficiency should be improved to maintain the battery cells within a safe temperature range. Therefore, the coolant inlet temperature can be reduced, and the coolant inlet speed can be increased to increase the hydraulic pressure of the coolant entering the self-adhesive semi-ring 31, thereby generating greater pressure on the heat-conducting spring 32. Figure 4In the figure, 'a' represents the battery cell. The heat-conducting spring 32 expands and deforms towards the battery cell and comes into contact with it, achieving the effect of direct heat exchange with the battery cell. This significantly accelerates the heat dissipation of the battery cell. Compared with the existing technology, which only cools the end of the battery cell, this greatly improves the uniformity of temperature distribution among multiple battery cells in the battery pack. Furthermore, the through-flow channel in the heat-conducting plate 1, along with the longitudinal flow tube 3 that can simultaneously guide the coolant, effectively solves the problem of uneven temperature distribution caused by the serpentine or S-shaped flow channel in the existing technology.

[0036] Example 2:

[0037] Compared to Example 1, this example further improves the longitudinal flow tube 3 and adds some corresponding structures, while the rest remains the same as in Example 1.

[0038] like Figures 5-6 The self-adhesive semi-ring 31 has a segmented structure. Multiple corresponding and matrix-distributed limiting frames are fixedly connected to the ends of the two heat-conducting plates 1 that are close to each other. Two opposing limiting frames are respectively fitted onto the outer sides of both ends of the longitudinal flow tube 3. Each limiting frame includes a limiting ring 41 fitted onto the two self-adhesive semi-rings 31 and multiple connecting rods 42 fixedly connected between the limiting ring 41 and the adjacent heat-conducting plate 1. The self-adhesive semi-ring 31 includes a micro-motion section 311, two follower sections 312 respectively fixedly connected to the ends of the two micro-motion sections 311, and two connecting rods 312 respectively fixedly connected to the follower sections 312 and... The fixed section 313 between adjacent heat-conducting plates 1 and the two sets of outer ends of the two micro-moving sections 311 are respectively fixedly connected to two sets of adjusting components 5. The two sets of adjusting components 5 are centrally symmetrically distributed, so that the two sets of adjusting components 5 can control the two micro-moving sections 311 to rotate in opposite directions at small angles, so that the two gaps formed by the two self-adhesive semi-rings 31 can be covered by the heat-conducting spring sheet 32, so that the corresponding battery cells can also perform contact heat exchange. The outer ends of the micro-moving sections 311 are fixedly connected to two sets of limiting rings 401, and the two limiting rings 41 correspond to the two sets of limiting rings 401 respectively.

[0039] like Figure 7 The directional assembly 5 includes a base 51 fixedly connected to the outer end of the micro-motion segment 311, an electric push rod 52 fixedly connected to the outer end of the base 51, a rope loop 501 fixedly connected to the outer end of another micro-motion segment 311, and a pull rope 53 tied between the electric push rod 52 and the rope loop 501. In specific implementation, those skilled in the art can select a suitable model of electric push rod 52 according to actual needs, such as HTA750.

[0040] Both the micro-motion section 311 and the fixed section 313 are rigid structures, the follower section 312 is an elastic sealing structure, the pull rope 53 is a flexible non-elastic structure, and the electric push rod 52 is connected to the temperature control center of the battery pack. The temperature control center of the battery pack and the temperature acquisition related equipment used in conjunction with the temperature control center, such as temperature sensors, are all relatively mature and conventional settings in the existing technology and are not used as protection points in this solution. Therefore, they are not described in detail in this solution.

[0041] At abnormally high temperatures, the thermally conductive spring sheet 32 ​​inside the self-adhesive semi-ring 31 can adhere to the surface of the battery cell, thereby directly exchanging heat with it. Figure 8 At this time, the temperature control center can first control the electric push rod 52 in one of the adjustment components 5 to shorten, thereby driving the corresponding micro-motion segment 311 to move towards another micro-motion segment 311, presenting a small angle rotation state, so as to gradually cover the gap, so that the expanded heat-conducting spring sheet 32 ​​can gradually contact the surface of the corresponding battery cell at the gap for heat exchange. During this process, the other set of electric push rods 52 extends synchronously to adapt to the small angle rotation of the micro-motion segment 311.

[0042] When the two micro-movement sections 311 come into contact, the temperature control center can control another set of electric push rods 52 to shorten until the other ends of the two micro-movement sections 311 come into contact. Then the above process is repeated continuously to achieve the alternating small-angle rotation of the two micro-movement sections 311 in the same longitudinal flow tube 3, thereby covering the cell corresponding to the gap between the two self-adhesive semi-rings 31. This allows the cell to make relatively comprehensive contact heat exchange, so that the part of the cell corresponding to the gap is less likely to have a slightly higher temperature due to failure to make direct contact heat exchange with the longitudinal flow tube 3. Compared with Example 1, the temperature distribution uniformity on the battery pack is further improved.

[0043] The above description is merely a preferred embodiment of this utility model; it encompasses all the protection scope of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be covered within the protection scope of this utility model.

Claims

1. A liquid cooling assembly for a power battery pack, comprising two heat-conducting plates (1) through which multiple battery cells are movably penetrated, each of the two heat-conducting plates (1) having multiple convection holes (101) respectively, the multiple convection holes (101) being staggered with the multiple battery cells, characterized in that: The heat-conducting plate (1) is a hollow structure, and the two heat-conducting plates (1) are fixedly connected to the sides of each other with liquid guiding pipes (2) that communicate with their interiors. Multiple longitudinal flow tubes (3) are fixedly connected between the two heat-conducting plates (1) in a matrix distribution. The multiple longitudinal flow tubes (3) are respectively fitted around the multiple battery cells inside the battery pack. The longitudinal flow tube (3) includes two self-adhesive semi-rings (31). The self-adhesive semi-rings (31) are also hollow structures, and the two ends of the self-adhesive semi-rings (31) are respectively connected to the interiors of the two heat-conducting plates (1). Multiple evenly distributed liquid guiding holes (301) are drilled on the inner wall of the self-adhesive semi-rings (31) facing the battery cell. A heat-conducting elastic sheet (32) is also provided on the inner wall of the self-adhesive semi-rings (31) facing the battery cell. The heat-conducting elastic sheet (32) completely covers the multiple liquid guiding holes (301), and the edge of the heat-conducting elastic sheet (32) is sealed and fixed to the self-adhesive semi-rings (31).

2. The liquid cooling assembly for a power battery pack according to claim 1, characterized in that: The two liquid guide tubes (2) are located near the upper and lower ends of the two heat conduction plates (1), respectively. The liquid guide tube (2) near the lower end is used for liquid inlet, and the other liquid guide tube (2) is used for liquid outlet.

3. A liquid cooling assembly for a power battery pack according to claim 2, characterized in that: The heat-conducting elastic sheet (32) is an elastic sealing structure, and neither of the two self-adhesive semi-rings (31) is in contact with the outer surface of the battery cell.

4. A liquid cooling assembly for a power battery pack according to claim 1, characterized in that: The self-adhesive semi-ring (31) is a segmented structure. The two heat-conducting plates (1) are fixedly connected to each other at one end, and are arranged in a matrix. The two opposing limit frames are respectively sleeved on the outer sides of the two ends of the longitudinal flow tube (3). The limit frame includes a limit ring (41) sleeved on the two self-adhesive semi-rings (31) and a plurality of connecting rods (42) fixedly connected between the limit ring (41) and the adjacent heat-conducting plate (1).

5. A liquid cooling assembly for a power battery pack according to claim 4, characterized in that: The self-adhesive semi-ring (31) includes a micro-movement segment (311), two follower segments (312) respectively fixedly connected to the ends of the two micro-movement segments (311), and two fixed segments (313) respectively fixedly connected between the follower segments (312) and the adjacent heat-conducting plate (1). Two sets of adjustment components (5) are fixedly connected between the two sets of outer ends of the two micro-movement segments (311) that are close to each other. Two sets of limiting rings (401) are fixedly connected to the outer ends of the micro-movement segments (311). The two limiting rings (41) correspond to the two sets of limiting rings (401) respectively.

6. A liquid cooling assembly for a power battery pack according to claim 5, characterized in that: The two sets of steering components (5) are centrally symmetrically distributed. The steering component (5) includes a base (51) fixedly connected to the outer end of the micro-motion section (311), an electric push rod (52) fixedly connected to the outer end of the base (51), a rope loop (501) fixedly connected to the outer end of another micro-motion section (311), and a pull rope (53) tied between the electric push rod (52) and the rope loop (501).

7. A liquid cooling assembly for a power battery pack according to claim 6, characterized in that: The micro-motion section (311) and the fixed section (313) are both rigid structures, the follower section (312) is an elastic sealing structure, the pull rope (53) is a flexible non-elastic structure, and the electric push rod (52) is connected to the temperature control center signal of the battery pack.

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