Immersed liquid-cooled battery pack

Abstract

The invention relates to an immersed liquid-cooled battery pack, which belongs to the technical field of battery heat dissipation, and comprises a cooling box, a sealing cover, a fixed support and a battery, the top end of the cooling box is provided with an opening, a static first cooling medium is contained in the cooling box, and communicated cooling channels are arranged in the side wall and the bottom wall of the cooling box; the sealing cover covers the opening of the cooling box; the fixing support and the battery are both located in the cooling box, and the battery is fixed to the fixing support. According to the invention, the battery is immersed in the first cooling medium of the cooling box, and the communicated cooling channels are arranged in the side wall and the bottom wall of the cooling box, so that the heat of the battery can be quickly diffused into the first cooling medium, and the heat of the first cooling medium can be quickly diffused into the second cooling medium, thereby reducing the heat transfer path and improving the heat transfer efficiency. The path is kept consistent, the larger heat storage capacity is provided, the temperature uniformity of the battery is kept, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This invention relates to the field of battery heat dissipation technology, and in particular to an immersion liquid-cooled battery pack. Background Technology

[0002] With the rapid development of electric vehicles, energy storage power stations, and other fields, high-energy-density, high-power charge-discharge battery packs are widely used. These batteries generate a lot of heat during operation. If the heat cannot be dissipated in a timely and even manner, it will lead to an increase in battery temperature and a greater temperature difference, which will seriously affect the battery's cycle life, charge-discharge efficiency, and safety performance.

[0003] In recent years, immersion liquid cooling technology has been regarded as an important direction for the thermal management of next-generation high-efficiency batteries due to its excellent temperature uniformity and high heat dissipation. For example, Chinese patent with patent number CN120497513A, entitled "An Immersion Liquid Cooling Battery Pack", contains a cooling medium in a cooling box and its bottom wall is a liquid cooling plate. Since the battery is immersed in the cooling medium in the cooling box, the battery's operating temperature can be reduced while the cooling plate absorbs the heat of the cooling medium.

[0004] However, the battery's heat is mainly concentrated on the electrodes. Since the electrodes are located at the top of the battery and far from the bottom cooling plate, the heat generation location is far from the heat absorption location. The bottom liquid cooling plate can quickly remove the heat from the bottom cooling medium, while the heat from the cooling medium located at the top of the cell needs to go through a long heat transfer path from top to bottom to reach the liquid cooling plate and transfer the heat out, resulting in an excessive temperature difference between the top and bottom of the battery and a reduction in battery life.

[0005] Therefore, how to design an immersion liquid-cooled battery pack with a consistent heat transfer path and uniform heat dissipation is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] This invention provides an immersion liquid-cooled battery pack, which solves the technical problems of excessive temperature difference between the top and bottom of existing immersion liquid-cooled battery packs and the resulting decrease in battery life.

[0007] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: an immersion liquid-cooled battery pack includes: a cooling tank, a sealing cover, a fixing bracket, and a battery. The top of the cooling tank has an opening and contains a static first cooling medium inside. The side walls and bottom walls of the cooling tank have communicating cooling channels. The inlet and outlet of the cooling channels respectively penetrate two opposite inner side walls of the cooling tank and form a cooling medium inlet and a cooling medium outlet, respectively. The sealing cover is located below the cooling medium inlet and the cooling medium outlet and covers the opening of the cooling tank. The fixing bracket and the battery are both located inside the cooling tank and are both immersed in the first cooling medium. The battery is fixed on the fixing bracket. The cooling medium inlet and the cooling medium outlet are used to communicate with an external refrigeration system to introduce a flowing second cooling medium into the cooling channels to absorb the heat of the first cooling medium and reduce the operating temperature of the battery.

[0008] The beneficial effects of this invention are: it improves upon traditional immersion liquid-cooled battery packs by first immersing the battery in a first cooling medium within a cooling tank, and then providing interconnected cooling channels within the side and bottom walls of the cooling tank. Since the inlet and outlet of the cooling channels respectively penetrate the two inner side walls of the cooling tank to form a cooling medium inlet and outlet, and since the cooling medium inlet and outlet are respectively connected to an external refrigeration system, the heat from the battery can be rapidly diffused into the first cooling medium, and the heat from the first cooling medium can be rapidly diffused into the second cooling medium. This reduces the heat transfer path, maintains a consistent path, provides greater heat storage capacity, maintains battery temperature uniformity, and extends battery life.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the fixed bracket includes a bottom plate, a top plate, and a support frame, all located within the cooling box. The top plate is located above the bottom plate, and its top end is fixed to the bottom end of the sealing cover. The support frame has a cross-section in the shape of a cross, and its top end is fixed to the bottom end of the top plate, while its bottom end is fixed to the top end of the bottom plate, thus forming multiple battery assembly areas between the bottom plate, the top plate, and the support frame. The battery includes multiple battery packs, all located within the cooling box. The multiple battery packs are arranged opposite to the multiple battery assembly areas, and each battery pack includes multiple battery cells. The multiple battery cells of each pack are respectively installed in the corresponding battery assembly area.

[0011] The further beneficial effect of adopting the above is that fixing multiple battery cells of multiple battery packs in multiple battery packaging areas can standardize the distribution of batteries.

[0012] Furthermore, the support frame is provided with multiple heat conduction holes.

[0013] The further beneficial effect of adopting the above is that setting multiple heat conduction holes on the support frame can accelerate the heat transfer speed and shorten the heat transfer path.

[0014] Furthermore, the fixed bracket also includes a bottom positioning block and multiple side positioning blocks. The inner bottom wall of the cooling box is provided with a bottom positioning groove and its inner side wall is provided with multiple side positioning grooves. The multiple side positioning grooves are distributed at intervals along the circumference of the cooling box and are arranged along the height direction of the cooling box. The multiple side positioning blocks are fixed at intervals along the circumference outside the support frame and can be inserted into the multiple side positioning grooves respectively. The bottom positioning block is fixed to the bottom end of the base plate and can be inserted into the bottom positioning groove.

[0015] The further beneficial effect of adopting the above is that: firstly, the bottom positioning block is fixed on the bottom plate and inserted into the bottom positioning groove, and then multiple side positioning blocks are fixed at intervals on the outside of the support frame and inserted into the side positioning groove. This allows for the positioning and arrangement of the fixed bracket inside the cooling box, improving the stability between the fixed bracket and the cooling box.

[0016] Furthermore, the fixing bracket also includes multiple annular straps, which are respectively arranged around the multiple battery packs and spaced apart and fixed to the bottom plate and the top plate.

[0017] The further beneficial effect of adopting the above is that by using multiple ring-shaped straps to be placed around multiple battery packs and spaced apart and fixed to the bottom plate and top plate, the batteries can be firmly fixed to the fixed bracket, improving the firmness between the batteries and the fixed bracket.

[0018] Furthermore, it also includes a negative electrode plate, a positive electrode plate, and a plurality of conductive plates, all located within the cooling box. The plurality of conductive plates are respectively fixed on a plurality of battery cells and the plurality of battery cells are connected in series. The negative electrode plate is fixed on the top plate and is respectively connected to the negative electrode of the plurality of conductive plates. The positive electrode plate is fixed on the top plate and is respectively connected to the positive electrode of the plurality of conductive plates.

[0019] The further beneficial effect of adopting the above is that multiple battery cells are first connected in series using multiple conductive sheets, and then the negative electrode sheet is connected to the negative electrode of multiple conductive sheets and the positive electrode sheet is connected to the positive electrode of multiple conductive sheets, which facilitates the electrical connection of multiple battery cells with external components.

[0020] Furthermore, it also includes a sealing ring, and the outer periphery of the sealing cover is provided with an annular sealing groove; the sealing ring is fitted inside the sealing groove and contacts the inner wall of the cooling box.

[0021] The further beneficial effect of adopting the above is that by using the sealing ring to fix it in the sealing groove of the sealing cover, when the sealing cover is placed at the opening of the cooling box, the sealing ring contacts the inner side wall of the cooling box, which can improve the sealing performance between the sealing cover and the cooling box.

[0022] Furthermore, it also includes two handles, which are respectively fixed to the two opposite outer side walls of the cooling box. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the assembly structure of an immersion liquid-cooled battery pack according to the present invention;

[0024] Figure 2 This is a schematic diagram showing the disassembled structure of an immersion liquid-cooled battery pack according to the present invention; Figure 3 This is a schematic diagram of the assembly structure of the battery, fixing bracket and annular strap in an immersion liquid-cooled battery pack according to the present invention; Figure 4 This is a schematic diagram showing the disassembled structure of the battery, fixing bracket, and annular strap in an immersion liquid-cooled battery pack according to the present invention. Figure 5 This is a schematic diagram of the assembly structure of the battery, fixing bracket, replacement strap, conductive sheet, negative electrode sheet and positive electrode sheet in an immersion liquid-cooled battery pack according to the present invention. Figure 6 This is a schematic diagram showing the disassembled structure of the battery, fixing bracket, replacement strap, conductive sheet, negative electrode sheet and positive electrode sheet in an immersion liquid-cooled battery pack according to the present invention. Figure 7 This is a schematic diagram of the overall assembly structure of the cooling box in an immersion liquid-cooled battery pack according to the present invention; Figure 8 This is a schematic diagram showing the disassembled structure of the cooling box in an immersion liquid-cooled battery pack according to the present invention; Figure 9 This is a cross-sectional view of the cooling box in an immersion liquid-cooled battery pack according to the present invention.

[0025] The attached diagram lists the components represented by each number as follows: 1. Cooling box; 11. Opening; 12. Cooling channel; 13. Cooling medium inlet; 14. Cooling medium outlet; 15. Side positioning groove; 16. Bottom positioning groove; 2. Sealing cover; 3. Fixing bracket; 31. Base plate; 32. Top plate; 33. Support frame; 34. Side positioning block; 35. Annular wrapping strap; 4. Battery; 41. Battery cell; 5. Negative electrode plate; 6. Positive electrode plate; 7. Conductive plate; 8. Handle. Detailed Implementation

[0026] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0027] like Figure 1 and Figure 9As shown, an immersion liquid-cooled battery pack includes: a cooling tank 1, a sealing cover 2, a fixing bracket 3, and a battery 4. The top of the cooling tank 1 has an opening 11 and contains a static first cooling medium. The side walls and bottom walls of the cooling tank 1 have communicating cooling channels 12. The inlet and outlet of the cooling channels 12 respectively penetrate the two opposite inner side walls of the cooling tank 1 and form a cooling medium inlet 13 and a cooling medium outlet 14 respectively. The sealing cover 2 is located below the cooling medium inlet 13 and the cooling medium outlet 14 and covers the opening 11 of the cooling tank 1. The fixing bracket 3 and the battery 4 are both located in the cooling tank 1 and are both immersed in the first cooling medium. The battery 4 is fixed on the fixing bracket 3. The cooling medium inlet 13 and the cooling medium outlet 14 are used to communicate with an external refrigeration system to introduce a flowing second cooling medium into the cooling channels 12 to absorb the heat of the first cooling medium and reduce the operating temperature of the battery 4.

[0028] like Figure 4 As shown, in some specific embodiments, the fixed bracket 3 includes a bottom plate 31, a top plate 32, and a support frame 33, all located within the cooling box 1. The top plate 32 is located above the bottom plate 31, and its top end is fixed to the bottom end of the sealing cover 2. The support frame 33 has a cross-shaped structure, and its top end is fixed to the bottom end of the top plate 32, while its bottom end is fixed to the top end of the bottom plate 31, so as to form multiple battery 4 packaging areas between the bottom plate 31, the top plate 32, and the support frame 33. The battery 4 includes multiple battery packs, all located within the cooling box 1. The multiple battery packs are arranged opposite to the multiple battery 4 packaging areas, and each battery pack includes multiple battery cells 41. The multiple battery cells 41 of each pack are respectively installed in the corresponding battery 4 packaging area.

[0029] like Figure 4 As shown, in some specific embodiments, the support frame 33 may be provided with multiple heat conduction holes 331.

[0030] like Figure 4 As shown, in some specific embodiments, the fixed bracket 3 further includes a bottom positioning block 33 and a plurality of side positioning blocks 34. The inner bottom wall of the cooling box 1 is provided with a bottom positioning groove 16 and a plurality of side positioning grooves 15 are provided on its inner side wall. The plurality of side positioning grooves 15 are distributed at intervals along the circumference of the cooling box 1 and are arranged along the height direction of the cooling box 1. The plurality of side positioning blocks 34 are fixed at intervals along the circumference outside the support frame 33 and can be inserted into the plurality of side positioning grooves 15 respectively. The bottom positioning block 33 is fixed to the bottom end of the base plate 31 and can be inserted into the bottom positioning groove 16.

[0031] like Figure 4 As shown, in some specific embodiments, the fixing bracket 3 may also include multiple annular straps 35, which are respectively arranged around the multiple battery packs and are spaced and fixed to the outside of the bottom plate 31 and the top plate 32.

[0032] like Figure 5 and Figure 6 As shown, in some specific embodiments, it may also include a negative electrode plate 5, a positive electrode plate 6, and a plurality of conductive plates 7, all located in the cooling box 1. The plurality of conductive plates 7 are respectively fixed on a plurality of battery cells 41 and the plurality of battery cells 41 are connected in series. The negative electrode plate 5 is fixed on the top plate 32 and is respectively connected to the negative electrode of the plurality of conductive plates 7. The positive electrode plate 6 is fixed on the top plate 32 and is respectively connected to the positive electrode of the plurality of conductive plates 7.

[0033] Specifically, it may also include a sealing ring, and the outer periphery of the sealing cover 2 is provided with an annular sealing groove; the sealing ring is fitted inside the sealing groove and contacts the inner wall of the cooling box 1.

[0034] like Figure 1 and Figure 7 As shown, in some specific embodiments, two handles 8 may also be included, which are respectively fixed to the two opposite outer side walls of the cooling box 1.

[0035] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An immersion liquid-cooled battery pack, characterized in that, include: The cooling box (1) has an opening (11) at the top and contains a static first cooling medium inside. The side wall and bottom wall are provided with a communicating cooling channel (12). The inlet and outlet of the cooling channel (12) respectively penetrate the two opposite inner side walls of the cooling box (1) and form a cooling medium inlet (13) and a cooling medium outlet (14) respectively. A sealing cover (2) is located below the cooling medium inlet (13) and the cooling medium outlet (14) and covers the opening (11) of the cooling box (1); The fixed bracket (3) and the battery (4) are both located in the cooling box (1) and are both immersed in the first cooling medium. The battery (4) is fixed on the fixed bracket (3). The cooling medium inlet (13) and the cooling medium outlet (14) are used to connect with the external refrigeration system to introduce the flowing second cooling medium into the cooling channel (12) to absorb the heat of the first cooling medium and reduce the working temperature of the battery (4).

2. The immersion liquid-cooled battery pack according to claim 1, characterized in that, The fixed bracket (3) includes a bottom plate (31), a top plate (32) and a support frame (33) all located in the cooling box (1). The top plate (32) is located above the bottom plate (31) and its top end is fixed to the bottom end of the sealing cover (2). The support frame (33) has a cross-shaped structure and its top end is fixed to the bottom end of the top plate (32), and its bottom end is fixed to the top end of the bottom plate (31), so as to form multiple battery (4) disassembly areas between the bottom plate (31), the top plate (32) and the support frame (33). The battery (4) includes multiple battery packs all located in the cooling box (1). The multiple battery packs are respectively arranged opposite to the multiple battery (4) disassembly areas, and each battery pack includes multiple battery cells (41). The multiple battery cells (41) of each pack are respectively installed in the corresponding battery (4) disassembly area.

3. The immersion liquid-cooled battery pack according to claim 2, characterized in that, The support frame (33) is provided with multiple heat conduction holes (331).

4. The immersion liquid-cooled battery pack according to claim 2, characterized in that, The fixed bracket (3) also includes a bottom positioning block (33) and a plurality of side positioning blocks (34). The inner bottom wall of the cooling box (1) is provided with a bottom positioning groove (16) and a plurality of side positioning grooves (15) are provided on its inner side wall. The plurality of side positioning grooves (15) are distributed at intervals along the circumference of the cooling box (1) and are arranged along the height direction of the cooling box (1). The plurality of side positioning blocks (34) are fixed at intervals along the circumference outside the support frame (33) and can be inserted into the plurality of side positioning grooves (15) respectively. The bottom positioning block (33) is fixed at the bottom end of the base plate (31) and can be inserted into the bottom positioning groove (16).

5. The immersion liquid-cooled battery pack according to claim 2, characterized in that, The fixed bracket (3) also includes a plurality of annular wrapping straps (35), which are respectively arranged around the outside of the plurality of battery packs and are spaced and fixed outside the bottom plate (31) and the top plate (32).

6. The immersion liquid-cooled battery pack according to claim 2, characterized in that, It also includes a negative electrode sheet (5), a positive electrode sheet (6), and a plurality of conductive sheets (7) all located in the cooling box (1). The plurality of conductive sheets (7) are respectively fixed on the plurality of battery cells (41) and the plurality of battery cells (41) are connected in series. The negative electrode sheet (5) is fixed on the top plate (32) and is respectively connected to the negative electrode of the plurality of conductive sheets (7). The positive electrode sheet (6) is fixed on the top plate (32) and is respectively connected to the positive electrode of the plurality of conductive sheets (7).

7. The immersion liquid-cooled battery pack according to claim 1, characterized in that, It also includes a sealing ring, and the outer periphery of the sealing cover (2) is provided with an annular sealing groove; the sealing ring is fitted in the sealing groove and contacts the inner wall of the cooling box (1).

8. The immersion liquid-cooled battery pack according to claim 1, characterized in that, It also includes two handles (8), which are respectively fixed to the two opposite outer side walls of the cooling box (1).

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