Liquid-cooled battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a liquid-cooled battery pack which comprises a battery cell and a plurality of liquid-cooled components, the liquid cooling assembly comprises a plurality of snake-shaped liquid cooling plates, one side of each liquid cooling plate is provided with a plurality of first arc-shaped surfaces, the first arc-shaped surfaces form first grooves, the first grooves of the adjacent liquid cooling plates in the same liquid cooling assembly are arranged in a one-to-one opposite mode and form first battery cell grooves in a surrounding mode, and the first battery cell grooves are used for inserting battery cells. The battery cells in the liquid-cooled battery pack can fully exchange heat with the liquid-cooled plate, so that the liquid-cooled battery pack has good heat dissipation performance.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a liquid-cooled battery pack. Background Art

[0002] Battery packs generate a lot of heat during the charging and discharging process, especially battery packs with a large number of cells. The dense grouping causes severe heat generation. If the heat cannot be quickly dissipated, the service life and safety performance of the battery pack will be seriously affected. Liquid cooling is the mainstream heat dissipation method for existing battery packs. To improve the heat dissipation effect, cylindrical batteries mostly use serpentine tube liquid cooling assembly technology, and the curved surface of the serpentine tube contacts the battery cell for heat transfer. However, the contact area between the serpentine tube and the battery cell in the existing technology is relatively small, and the heat dissipation capacity still needs to be further improved.

[0003] Therefore, there is an urgent need to propose a liquid-cooled battery pack to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a liquid-cooled battery pack, in which the battery cells can fully exchange heat with the liquid cooling plate and have good heat dissipation performance.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Liquid-cooled battery pack, including:

[0007] Battery cells;

[0008] Multiple liquid cooling components, the liquid cooling components include multiple serpentine liquid cooling plates, one side of the liquid cooling plate has multiple first arcuate surfaces, the first arcuate surfaces form first grooves, the first grooves of adjacent liquid cooling plates in the same liquid cooling component are arranged one by one opposite to each other and surround to form a first battery cell groove, and the first battery cell groove is used to insert the battery cell.

[0009] Optionally, the other side of the liquid cooling plate has a plurality of second arcuate surfaces, the second arcuate surfaces form second grooves, the second grooves in adjacent liquid cooling components are arranged opposite to each other and surround to form second battery cell grooves, and the second battery cell grooves are used to insert the battery cells.

[0010] Optionally, both the first groove and the second groove are contoured surfaces adapted to the side surface of the battery cell, and the depths of the first groove and the second groove are both greater than or equal to the radius of the battery cell.

[0011] Optionally, a plurality of the liquid cooling plates are arranged along a height direction of the battery core.

[0012] Optionally, multiple liquid cooling plates in the same liquid cooling assembly are connected in parallel.

[0013] Optionally, the liquid cooling assembly includes a liquid inlet manifold and a liquid outlet manifold, one end of the liquid cooling plate is connected to the liquid inlet manifold, the other end of the liquid cooling plate is connected to the liquid outlet manifold, and the liquid inlet manifold, the liquid cooling plate and the liquid outlet manifold are connected in sequence.

[0014] Optionally, a liquid inlet pipe is provided on the liquid inlet manifold, a liquid outlet pipe is provided on the liquid outlet manifold, the liquid inlet pipes in adjacent liquid cooling components are connected, and the liquid outlet pipes in adjacent liquid cooling components are connected.

[0015] Optionally, the liquid-cooled battery pack further includes a box body and a tray, the tray is fixedly connected to the box body, and the battery cell is arranged in the tray.

[0016] Optionally, positioning grooves are provided on the tray, and the positioning grooves are arranged in one-to-one correspondence with the battery cells.

[0017] Optionally, the tray includes a bottom plate and a surrounding plate connected to the bottom plate at four sides, the positioning groove is arranged on the bottom plate, the surrounding plate is provided with an avoidance opening, and the two ends of the liquid cooling plate are arranged through the avoidance opening.

[0018] Optionally, a heat-conducting structural adhesive is provided in the box body, and the tray is bonded to the box body through the heat-conducting structural adhesive.

[0019] Optionally, a through hole is provided at the bottom of the positioning groove, and the thermally conductive structural adhesive can flow through the through hole, and the battery core and the tray are bonded by the thermally conductive structural adhesive.

[0020] Beneficial effects:

[0021] The liquid-cooled battery pack provided by the utility model dissipates heat from the battery cell by setting a liquid cooling component. By setting a plurality of staggered serpentine liquid cooling plates, the outer periphery of the battery cell can be in contact with the first arc surface of the liquid cooling plate as much as possible. Compared with the traditional design, the contact area between the liquid cooling plate and the battery cell is larger, thereby increasing the heat transfer efficiency, having good heat dissipation performance, effectively preventing the battery cell temperature from rising, and reducing the occurrence of dangerous accidents such as thermal runaway of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 It is a partial structural schematic diagram of the liquid cooling plate provided by the utility model;

[0024] Figure 2 It is a partial structural schematic diagram of the liquid cooling assembly and the battery core provided by the utility model after assembly;

[0025] Figure 3 This is a partial top view of the assembled liquid cooling assembly and battery core provided by the utility model;

[0026] Figure 4 It is a partial structural schematic diagram of the battery pack provided by the utility model;

[0027] Figure 5 It is a partial structural exploded diagram of the battery pack provided by the utility model;

[0028] Figure 6 It is a structural schematic diagram of a tray provided by the utility model.

[0029] In the figure:

[0030] 100, battery cell; 200, liquid cooling assembly; 210, liquid cooling plate; 2101, first curved surface; 2102, second curved surface; 211, first battery cell slot; 212, second battery cell slot; 220, liquid inlet manifold; 221, liquid inlet pipe; 230, liquid outlet manifold; 231, liquid outlet pipe; 240, liquid inlet main pipe; 250, liquid outlet main pipe; 300, housing; 400, tray; 410, bottom plate; 411, positioning groove; 420, enclosure; 421, escape opening. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] See also Figures 1 to 3 The present embodiment provides a liquid-cooled battery pack, including a battery cell 100 and a plurality of liquid-cooling components 200. The liquid-cooling components 200 include a plurality of serpentine liquid-cooling plates 210, one side of the liquid-cooling plates 210 having a plurality of first arcuate surfaces 2101, the first arcuate surfaces 2101 forming a first groove, the first grooves of adjacent liquid-cooling plates 210 in the same liquid-cooling component 200 are arranged one by one opposite to each other and surround to form a first battery cell groove 211, the first battery cell groove 211 being used to insert the battery cell 100.

[0036] The above-mentioned liquid-cooled battery pack dissipates heat from the battery cell 100 by providing a liquid cooling assembly 200. By providing a plurality of staggered serpentine liquid cooling plates 210, the outer periphery of the battery cell 100 can be in contact with the first arc surface 2101 of the liquid cooling plate 210 as much as possible. Compared with the traditional design, the contact area between the liquid cooling plate 210 and the battery cell 100 is larger, thereby improving the heat transfer efficiency, having good heat dissipation performance, effectively preventing the temperature of the battery cell 100 from rising, and reducing the occurrence of dangerous accidents such as thermal runaway of the battery pack.

[0037] See also Figure 1 and Figure 2 The first groove is a contoured surface adapted to the side of the battery cell 100, and the depth of the first groove is greater than or equal to the radius of the battery cell 100, that is, the curvature of the first curved surface 2101 of the liquid cooling plate 210 is set according to the outer diameter of the battery cell 100, thereby ensuring that the outer periphery of the battery cell 100 located in the first battery cell groove 211 can be completely fitted to the first curved surface 2101 of the liquid cooling plate 210, thereby greatly improving the heat exchange efficiency between the battery cell 100 and the liquid cooling plate 210.

[0038] In this embodiment, the number of liquid cooling plates 210 is four, and in other embodiments, the number of liquid cooling plates 210 may be two, six, or eight, etc. It can be understood that by setting the number of liquid cooling plates 210 to an even number, the contact area between the two sides of the battery cell 100 and the liquid cooling plates 210 can be ensured to be the same, and the temperature on both sides can be balanced. The interior of the liquid cooling plate 210 is a hollow structure, and coolant can be passed into the liquid cooling plate 210. The coolant flowing through the interior of the liquid cooling plate 210 can take away the heat of the battery cell 100. Optionally, the coolant can be cold water or other liquids, as long as it can cool the battery cell 100.

[0039] Further, see Figure 2 and Figure 3 The other side of the liquid cooling plate 210 has a plurality of second arcuate surfaces 2102 , the second arcuate surfaces 2102 form second grooves, the second grooves in adjacent liquid cooling components 200 are arranged one by one opposite to each other and surround to form second battery cell grooves 212 , and the second battery cell grooves 212 are used to insert the battery cells 100 .

[0040] By adopting the liquid cooling plate 210 of the above-mentioned shape, the battery cells 100 are staggered, and multiple liquid cooling components 200 are assembled to form a honeycomb shape, which not only increases the contact area between the battery cells 100 and the liquid cooling plate 210 and improves the heat dissipation efficiency, but also enables the battery cells 100 to be arranged compactly and fully utilize the internal space of the battery pack. In addition, the overall structure of the battery pack is stable, and the battery cells 100 and the liquid cooling plate 210 are not easy to loosen.

[0041] Furthermore, the second groove is a contoured surface adapted to the side of the battery cell 100, and the depth of the second groove is greater than or equal to the radius of the battery cell 100, that is, the curvature of the second curved surface 2102 of the liquid cooling plate 210 is set according to the outer diameter of the battery cell 100, thereby ensuring that the outer periphery of the battery cell 100 located in the second battery cell groove 212 can be completely fitted to the second curved surface 2102 of the liquid cooling plate 210, thereby greatly improving the heat exchange efficiency between the battery cell 100 and the liquid cooling plate 210.

[0042] See also Figure 2 , the plurality of liquid cooling plates 210 are arranged along the height direction of the battery core 100 .

[0043] Further, see Figures 2 to 4 In this embodiment, multiple liquid cooling plates 210 in the same liquid cooling assembly 200 are connected in parallel.

[0044] Furthermore, the liquid cooling assembly 200 includes a liquid inlet manifold 220 and a liquid outlet manifold 230, one end of the liquid cooling plate 210 is connected to the liquid inlet manifold 220, and the other end of the liquid cooling plate 210 is connected to the liquid outlet manifold 230, and the liquid inlet manifold 220, the liquid cooling plate 210 and the liquid outlet manifold 230 are connected in sequence.

[0045] On one hand, the liquid inlet manifold 220 and the liquid outlet manifold 230 can fixedly connect the plurality of liquid cooling plates 210 , and on the other hand, the interiors of the liquid inlet manifold 220 and the liquid outlet manifold 230 are connected to the interior of the liquid cooling plate 210 , so that the cooling liquid can flow.

[0046] Exemplarily, the coolant flows from the inlet manifold 220 to the multiple liquid cooling plates 210, and then flows through the liquid cooling plates 210 and converges into the outlet manifold 230. The multiple liquid cooling plates 210 are connected in parallel, and the coolant can quickly fill the liquid cooling plates 210, ensuring that the liquid cooling assembly 200 has a high heat dissipation efficiency.

[0047] Furthermore, a liquid inlet pipe 221 is provided on the liquid inlet manifold 220, a liquid outlet pipe 231 is provided on the liquid outlet manifold 230, and the liquid inlet pipes 221 in adjacent liquid cooling components 200 are connected, and the liquid outlet pipes 231 in adjacent liquid cooling components 200 are connected.

[0048] In this embodiment, multiple liquid cooling components 200 are connected in parallel. Optionally, a liquid inlet manifold 240 is provided on the outermost liquid inlet pipe 221, and a liquid outlet manifold 250 is provided on the outermost liquid outlet pipe 231. The cooling liquid enters the liquid inlet manifold 220 from the liquid inlet manifold 240, and then flows into multiple liquid cooling plates 210, and then flows into the liquid outlet manifold 230 through the liquid cooling plates 210, and finally flows into the liquid outlet manifold 250, and flows out of the liquid cooling component 200.

[0049] Furthermore, the liquid-cooled battery pack further includes a box body 300 and a tray 400. The tray 400 is fixedly connected to the box body 300, and the battery cell 100 is arranged in the tray 400.

[0050] Optionally, the tray 400 is made of plastic material and has insulation and heat insulation functions, which can prevent conductive connection between the battery cell 100 and the box body 300 .

[0051] Furthermore, the tray 400 is provided with positioning grooves 411 , and the positioning grooves 411 and the battery cells 100 are arranged in a one-to-one correspondence.

[0052] Exemplarily, the bottom of the battery cell 100 is inserted into the positioning groove 411 , and the positioning groove 411 can position the battery cell 100 to ensure a stable connection between the battery cell 100 and the tray 400 .

[0053] Further, see Figure 5 and Figure 6 The tray 400 includes a bottom plate 410 and a surrounding plate 420 connected to the bottom plate 410 . The positioning groove 411 is provided on the bottom plate 410 . The surrounding plate 420 is provided with an avoidance opening 421 . Both ends of the liquid cooling plate 210 are provided through the avoidance opening 421 .

[0054] It can be understood that the avoidance opening 421 is arranged along the height direction of the tray 400, and the liquid cooling plate 210 can be inserted into the avoidance opening 421 from top to bottom, so that the avoidance opening 421 plays a role in positioning the liquid cooling component 200. The avoidance opening 421 is arranged on the enclosure 420 at both ends of the tray 400 in the length direction, and a plurality of avoidance openings 421 are arranged at each end, and the plurality of avoidance openings 421 are arranged at equal intervals.

[0055] Furthermore, a heat-conducting structural adhesive is disposed in the box body 300 , and the tray 400 is bonded to the box body 300 by the heat-conducting structural adhesive.

[0056] The thermally conductive structural adhesive can firmly connect the box body 300 and the tray 400, and the thermally conductive structural adhesive has good heat transfer performance, which helps to dissipate heat from the battery pack.

[0057] Further, see Figure 6 A through hole is provided at the bottom of the positioning groove 411, and the thermal conductive structural adhesive can flow through the through hole, and the battery cell 100 and the tray 400 are bonded by the thermal conductive structural adhesive.

[0058] For example, during assembly, the thermal conductive structural adhesive is poured into the bottom of the box 300, and then the tray 400 is placed in the box 300. The thermal conductive structural adhesive can overflow onto the tray 400 through the through hole, so that it can be used to bond the tray 400 and the battery cell 100. Further pouring the thermal conductive structural adhesive into the tray 400 can bond the battery cell 100 and the liquid cooling plate 210. The thermal conductive structural adhesive can play a role in fixing and connecting the battery cell 100 and the liquid cooling plate 210, and can promote heat exchange between the liquid cooling assembly 200 and the battery cell 100.

[0059] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Liquid-cooled battery pack, characterized in that: include: Battery cell (100); A plurality of liquid cooling components (200), the liquid cooling components (200) comprising a plurality of serpentine liquid cooling plates (210), one side of the liquid cooling plates (210) having a plurality of first arcuate surfaces (2101), the first arcuate surfaces (2101) forming first grooves, the first grooves of adjacent liquid cooling plates (210) in the same liquid cooling component (200) being arranged opposite to each other and surrounding each other to form a first battery cell groove (211), the first battery cell groove (211) being used for inserting the battery cell (100); The liquid-cooled battery pack further comprises a box body (300) and a tray (400), wherein the tray (400) is fixedly connected to the box body (300), and the battery cell (100) is arranged in the tray (400); The tray (400) is provided with positioning grooves (411), and the positioning grooves (411) are arranged in one-to-one correspondence with the battery cells (100).

2. The liquid-cooled battery pack according to claim 1, characterized in that: The first groove is a contoured surface adapted to the side surface of the battery core (100), and the depth of the first groove is greater than or equal to the radius of the battery core (100).

3. The liquid-cooled battery pack according to any one of claims 1 to 2, characterized in that: The other side of the liquid cooling plate (210) has a plurality of second arcuate surfaces (2102), the second arcuate surfaces (2102) forming second grooves, the second grooves in adjacent liquid cooling components (200) being arranged one by one opposite to each other and surrounding each other to form second battery cell grooves (212), the second battery cell grooves (212) being used for inserting the battery cells (100).

4. The liquid-cooled battery pack according to claim 3, characterized in that: The second groove is a contoured surface adapted to the side surface of the battery core (100), and the depth of the second groove is greater than or equal to the radius of the battery core (100).

5. The liquid-cooled battery pack according to any one of claims 1 to 2, characterized in that: The plurality of liquid cooling plates (210) are arranged along the height direction of the battery core (100).

6. The liquid-cooled battery pack according to any one of claims 1-2, characterized in that: The plurality of liquid cooling plates (210) in the same liquid cooling assembly (200) are connected in parallel.

7. The liquid-cooled battery pack according to any one of claims 1 to 2, characterized in that: The liquid cooling assembly (200) comprises a liquid inlet manifold (220) and a liquid outlet manifold (230); one end of the liquid cooling plate (210) is connected to the liquid inlet manifold (220); the other end of the liquid cooling plate (210) is connected to the liquid outlet manifold (230); the liquid inlet manifold (220), the liquid cooling plate (210) and the liquid outlet manifold (230) are connected in sequence.

8. The liquid-cooled battery pack according to claim 7, characterized in that: The liquid inlet manifold (220) is provided with a liquid inlet pipe (221), the liquid outlet manifold (230) is provided with a liquid outlet pipe (231), the liquid inlet pipes (221) in adjacent liquid cooling components (200) are connected, and the liquid outlet pipes (231) in adjacent liquid cooling components (200) are connected.

9. The liquid-cooled battery pack according to claim 1, characterized in that: The tray (400) comprises a bottom plate (410) and a surrounding plate (420) connected to the bottom plate (410) on four sides, the positioning groove (411) is arranged on the bottom plate (410), the surrounding plate (420) is provided with an avoidance opening (421), and the two ends of the liquid cooling plate (210) are arranged through the avoidance opening (421).

10. The liquid-cooled battery pack according to claim 9, characterized in that: A heat-conducting structural adhesive is disposed in the box (300), and the tray (400) is bonded to the box (300) via the heat-conducting structural adhesive.

11. The liquid-cooled battery pack according to claim 10, characterized in that: A through hole is provided at the bottom of the positioning groove (411), and the thermally conductive structural adhesive can flow through the through hole, and the battery core (100) and the tray (400) are bonded together by the thermally conductive structural adhesive.

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