Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack which comprises a first shell, a second shell, a first battery module, a liquid cooling plate, a second battery module and a vapor chamber, according to the battery pack with the structure, the double-layer battery modules are arranged, the second battery module is arranged at the upper part of the first battery module and is positioned in the convex hull area, and the convex hull area space of the second shell can be fully utilized to arrange the second battery module, so that the space utilization rate in the height direction of the battery pack is improved, and the volume grouping efficiency of the battery pack can be improved. Meanwhile, a liquid cooling plate of the battery pack is arranged at the top of the first battery module, a temperature equalizing plate is arranged between the liquid cooling plate and the second battery module, the heat of the second battery module is quickly conducted to the liquid cooling plate by utilizing the quick temperature equalizing characteristic of the temperature equalizing plate, and the liquid cooling plate cools the first battery module below the liquid cooling plate at the same time; the upper and lower layers of battery modules are cooled through one liquid cooling plate, so that the structure of the battery pack can be simplified.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack. Background Technology

[0002] The battery pack includes a first housing, a second housing, battery modules, and a liquid cooling plate. The battery modules are housed within the first housing, the second housing covers the battery modules, and the liquid cooling plate is located at the bottom of the battery modules. The second housing has an upwardly convex area that affects the battery pack's volumetric assembly efficiency. Utility Model Content

[0003] In view of this, the present invention provides a battery pack to solve the problem of low efficiency in the assembly of battery packs in the prior art.

[0004] This utility model provides a battery pack, characterized in that it includes:

[0005] First shell;

[0006] A second housing is disposed on top of the first housing, and at least a portion of the second housing protrudes upward to form a convex hull area;

[0007] The first battery module is disposed inside the first housing;

[0008] A liquid cooling plate is disposed on top of the first battery module;

[0009] The second battery module is disposed on the upper part of the liquid cooling plate and located within the convex hull area;

[0010] A heat spreader is disposed between the second battery module and the liquid cooling plate.

[0011] Beneficial effects: This battery pack structure features a double-layer battery module. The second battery module is positioned above the first battery module and within the convex area. This allows for full utilization of the space in the convex area of ​​the second housing to house the second battery module, improving space utilization in the height direction and thus increasing the volumetric packing efficiency. Simultaneously, the liquid cooling plate is located on top of the first battery module, with a heat spreader between the liquid cooling plate and the second battery module. Utilizing the rapid heat spreader's properties, heat from the second battery module is quickly transferred to the liquid cooling plate, which in turn cools the first battery module below. This single liquid cooling plate achieves cooling for both battery modules, simplifying the battery pack structure.

[0012] In one optional embodiment, the liquid cooling plate includes a base plate and a flow channel plate, the base plate being disposed on the top of the first battery module, and the bottom surface of the base plate being a plane;

[0013] And / or, the top surface of the temperature distribution plate is a plane.

[0014] Beneficial effects: This arrangement facilitates the placement of the top surface of the first battery module on the base plate, improving its heat dissipation. It also allows the bottom surface of the second battery module to be directly attached to the heat spreader, further enhancing its heat dissipation.

[0015] In one optional embodiment, a first thermally conductive adhesive layer is provided between the top surface of the first battery module and the bottom surface of the liquid cooling plate, and a second thermally conductive adhesive layer is provided between the bottom surface of the second battery module and the top surface of the heat spreader.

[0016] In one alternative embodiment, the first battery module is provided with a first end beam at its end, and the liquid cooling plate is detachably connected to the first end beam.

[0017] In one alternative embodiment, the end of the second battery module is provided with a second end beam.

[0018] In one optional embodiment, a first buffer component is provided between the battery cell at the outer end of the first battery module and the first end crossbeam;

[0019] And / or, a second buffer component is provided between the cell at the outer end of the second battery module and the second end beam.

[0020] In one optional embodiment, the first housing has a long side and a wide side, and the width of the first housing varies in different regions along its length to form a wide side region and a narrow side region within the first housing. The first battery module is disposed in both the wide side region and the narrow side region. The battery cells of the module in the wide side region extend along the length direction of the first housing, and the battery cells of the module in the narrow side region extend along the width direction of the first housing.

[0021] Beneficial effects: The arrangement direction of the cells in the wide and narrow sides is different. This allows the cells to be arranged according to the width of the first casing, making full use of the space in the width direction of the battery pack and improving the space utilization rate in the width direction of the battery pack. This can further improve the volumetric assembly efficiency of the battery pack.

[0022] In one optional embodiment, the first battery modules in the wide side area and the narrow side area are spaced apart along the length direction of the first housing, and the liquid cooling plate is integrally formed along the length direction of the first housing.

[0023] Beneficial effects: By covering the top of all the first battery modules with a liquid cooling plate, the liquid cooling plate can cool and dissipate heat for all the lower and upper battery modules, which can effectively simplify the battery pack structure.

[0024] In one optional embodiment, a bottom protective plate is also included. The first battery module is disposed on the top surface of the bottom wall of the first housing, and the bottom protective plate is disposed on the bottom surface of the bottom wall of the first housing. The gap between the bottom surface of the first battery module and the top surface of the bottom protective plate is z, and the height of the battery cell in the first battery module is h, where z ≥ 8%h.

[0025] In one optional embodiment, the height of the first housing is h1, and the height of the battery cell in the first battery module is h, where 0.8 ≤ h and h1 ≤ 1.2. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a battery pack according to an embodiment of the present utility model;

[0028] Figure 2 for Figure 1 Exploded view of the battery pack after the upper battery module has been removed;

[0029] Figure 3 for Figure 1 Exploded view of the battery pack;

[0030] Figure 4 for Figure 1 Schematic diagram of the liquid cooling plate and the heat spreader;

[0031] Figure 5 for Figure 1 Exploded view of the liquid cooling plate and the heat spreader;

[0032] Figure 6 for Figure 1 Exploded view of the liquid cooling plate;

[0033] Figure 7 for Figure 1 A schematic diagram of the first battery module in the diagram;

[0034] Figure 8 for Figure 1 A schematic diagram of a battery cell.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. First housing; 11. Wide side area; 12. Narrow side area; 2. First battery module; 3. Liquid cooling plate; 31. Base plate; 32. Flow channel plate; 4. Second battery module; 5. Heat spreader plate; 6. First end beam; 7. Second end beam. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0039] According to an embodiment of the present invention, a battery pack is provided, including a first housing 1, a second housing, a first battery module 2, a liquid cooling plate 3, a second battery module 4, and a heat spreader 5.

[0040] The second housing is located on top of the first housing 1, and at least a portion of the second housing protrudes upward to form a convex bulge area; the first battery module 2 is located inside the first housing 1; the liquid cooling plate 3 is located on top of the first battery module 2; the second battery module 4 is located above the liquid cooling plate 3 and within the convex bulge area; and the heat spreader 5 is located between the second battery module 4 and the liquid cooling plate 3.

[0041] This battery pack features a double-layer battery module. The second battery module 4 is positioned above the first battery module 2 and within the convex area. This design fully utilizes the space in the convex area of ​​the second housing to accommodate the second battery module 4, improving space utilization in the height direction and thus increasing the volumetric assembly efficiency of the battery pack. Simultaneously, a liquid cooling plate 3 is located on top of the first battery module 2. A heat spreader 5 is positioned between the liquid cooling plate 3 and the second battery module 4. Utilizing the rapid heat spreader 5, heat from the second battery module 4 is quickly transferred to the liquid cooling plate 3. The liquid cooling plate 3 simultaneously cools the first battery module 2 below it. Cooling both battery modules is achieved through a single liquid cooling plate 3, simplifying the battery pack structure.

[0042] like Figures 4 to 6 As shown, the liquid cooling plate 3 includes a base plate 31 and a flow channel plate 32. The base plate 31 is located on the top of the first battery module 2. The bottom surface of the base plate 31 is flat, which makes it convenient for the top surface of the first battery module 2 to be attached to the base plate 31, thereby improving the heat dissipation effect of the first battery module 2.

[0043] In some optional embodiments, the top surface of the heat spreader 5 is flat, which makes it convenient to directly attach the bottom surface of the second battery module 4 to the heat spreader 5, thereby improving the heat dissipation effect of the second battery module 4.

[0044] In some embodiments, the heat spreader 5 is bonded to the top surface of the flow channel plate 32 of the liquid cooling plate 3 by thermally conductive adhesive.

[0045] Optionally, in some embodiments, a first thermally conductive adhesive layer is provided between the top surface of the first battery module 2 and the bottom surface of the liquid cooling plate 3, and a second thermally conductive adhesive layer is provided between the bottom surface of the second battery module 4 and the top surface of the heat spreader 5. The battery modules are bonded and fixed to the liquid cooling plate 3 or the heat spreader 5 by the thermally conductive adhesive, which can ensure the heat conduction effect and the stability of the overall structure of the battery pack.

[0046] In some embodiments, the ratio of the thermal conductivity of the first thermally conductive adhesive layer to that of the second thermally conductive adhesive layer is 1.2-3, meaning the thermal conductivity of the first thermally conductive adhesive layer is greater than that of the second thermally conductive adhesive layer. A heat spreader 5 is provided at the second thermally conductive adhesive layer, which effectively ensures the heat dissipation of the second battery module 4. The fact that the thermal conductivity of the first thermally conductive adhesive layer is greater than that of the second thermally conductive adhesive layer ensures the heat dissipation of the first battery module 2.

[0047] In some embodiments, the bottom of the first battery module 2 is bonded to the bottom wall of the first housing 1 by structural adhesive.

[0048] like Figures 1 to 3 As shown, in some embodiments, the first battery module 2 is provided with a first end beam 6 at its end, and the liquid cooling plate 3 is detachably connected to the first end beam 6. The first end beam 6 can resist the expansion force of the module and can protect the module. The first end beam 6 is also used to fix the liquid cooling plate 3.

[0049] Optionally, the circumferential outer edge of the liquid cooling plate 3 is fixed to the end crossbeam by multiple bolts.

[0050] like Figure 3 As shown, in some embodiments, the second battery module 4 is provided with a second end beam 7 at its end. The second end beam 7 can strengthen the strength of the second battery module 4, thereby improving the overall structural strength of the battery pack.

[0051] Optionally, a support plate is provided above the liquid cooling plate 3, the support plate is fixed on the first end crossbeam 6, and the second end crossbeam 7 is fixed on the support plate.

[0052] In some optional embodiments, a first buffer component is provided between the cell at the outer end of the first battery module 2 and the first end beam 6. After the first battery module 2 expands, the expansion force is transmitted to the first buffer component, and then to the first end beam 6 through the first buffer component, which can reduce the damage to the cell at the outer end of the module. The first buffer component can also resist external impact force to protect the module inside it.

[0053] In some optional embodiments, a second buffer component is provided between the outer cell of the second battery module 4 and the second end beam 7. After the second battery module 4 expands, the expansion force is transmitted to the second buffer component, and then to the second end beam 7 through the second buffer component. This can reduce the damage to the outer cell of the module. At the same time, the second buffer component can resist external impact forces to protect the module inside.

[0054] Optionally, the materials of the first and second buffer components may include foam or non-metallic end plates.

[0055] like Figures 1 to 3 As shown, in some embodiments, the first housing 1 has a long side and a wide side. The width of different regions along the length of the first housing 1 is different, forming a wide side region 11 and a narrow side region 12 within the first housing 1. The wider region of the first housing 1 is the wide side region 11, and the narrower region is the narrow side region 12. A first battery module 2 is disposed in both the wide side region 11 and the narrow side region 12. The battery cells of the module in the wide side region 11 extend along the length of the first housing 1, and the battery cells of the module in the narrow side region 12 extend along the width of the first housing 1. The battery cells in the wide side region 11 and the narrow side region 12 have different arrangement directions. This allows the battery cells to be arranged according to the width of the first housing 1, making full use of the space in the width direction of the battery pack and improving the space utilization rate in the width direction of the battery pack, thereby further improving the volumetric assembly efficiency of the battery pack.

[0056] like Figure 2 , Figure 3 and Figure 7 As shown, in some embodiments, the width of the front end of the first housing 1 is smaller than the width of its rear end, and both the upper and lower battery modules include blade cells. The length of the cell in the narrow side area 12 is smaller than the length of the cell in the wide side area 11.

[0057] In some optional embodiments, the first housing 1 has a narrow side region 12 and two wide side regions 11. The long side of the battery cell in the narrow side region 12 extends along the width direction of the first housing 1, and the battery cell in the wide side region 11 extends along the length direction of the first housing 1. First end beams 6 are respectively provided at the front and rear ends of the module in the narrow side region 12, and first end beams 6 are provided at the left and right ends of the module in each wide side region 11.

[0058] like Figure 7As shown, the first battery modules 2 in the wide side area 11 and the narrow side area 12 are spaced apart along the length of the first housing 1. The gap between adjacent battery modules is used to set the end crossbeams of the lower modules. The liquid cooling plate 3 is integrally set along the length of the first housing 1. By covering the top of all the first battery modules 2 with a liquid cooling plate 3, the liquid cooling plate 3 can cool and dissipate heat for all the lower and upper battery modules, which can effectively simplify the battery pack structure.

[0059] like Figure 1 and Figure 2 As shown, in some embodiments, the convex bulge area is located at the rear of the second housing, and correspondingly, the heat spreader 5 is located at the rear of the liquid cooling plate 3, and the second battery module 4 is located at the upper part of the heat spreader 5.

[0060] In some embodiments, the battery pack further includes a bottom protective plate. The first battery module 2 is disposed on the top surface of the bottom wall of the first housing 1, and the bottom protective plate is disposed on the bottom surface of the bottom wall of the first housing 1. The gap between the bottom surface of the first battery module 2 and the top surface of the bottom protective plate is z, and the height of the battery cell in the first battery module 2 is h, z ≥ 8%h. This arrangement can ensure that there is sufficient distance between the bottom of the first battery module 2 and the bottom protective plate, ensuring the ball impact space of the battery pack and effectively protecting the battery cell.

[0061] In some alternative embodiments, such as Figure 2 and Figure 8 As shown, the height of the first housing 1 is h1, and the height of the battery cell in the first battery module 2 is h. 0.8≤h:h1≤1.2. This setting can prevent the height of the first housing 1 from being too small, ensuring that the first housing 1 has sufficient height to protect the battery cell inside. At the same time, it can prevent the height of the first housing 1 from being too high, which would waste space, and it can also prevent the height of the first housing 1 from being too high, which would increase the weight of the battery pack.

[0062] In some embodiments, the length of the battery cell is 350mm-1000mm, the terminals of the battery cell are located at both ends along the length of the battery cell, and the large surface of the battery cell is perpendicular to the bottom surface of the first housing 1. Explosion-proof valves of the battery cell are disposed on the end faces at both ends along the length of the battery cell, and each battery cell is provided with at least one explosion-proof valve.

[0063] like Figure 3 As shown, in some embodiments, a pressure plate is also included, which is bonded to the top surface of the second battery module 4 by structural adhesive, and the two ends of the pressure plate are fixed to the second end beam 7 by bolts.

[0064] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: First shell; A second housing is disposed on top of the first housing, and at least a portion of the second housing protrudes upward to form a convex hull area; The first battery module is disposed inside the first housing; A liquid cooling plate is disposed on top of the first battery module; The second battery module is disposed on the upper part of the liquid cooling plate and located within the convex hull area; A heat spreader is disposed between the second battery module and the liquid cooling plate.

2. The battery pack according to claim 1, characterized in that, The liquid cooling plate includes a base plate and a flow channel plate. The base plate is disposed on the top of the first battery module, and the bottom surface of the base plate is a plane. And / or, the top surface of the temperature distribution plate is a plane.

3. The battery pack according to claim 1 or 2, characterized in that, A first thermally conductive adhesive layer is provided between the top surface of the first battery module and the bottom surface of the liquid cooling plate, and a second thermally conductive adhesive layer is provided between the bottom surface of the second battery module and the top surface of the heat spreader.

4. The battery pack according to claim 1 or 2, characterized in that, The first battery module has a first end beam at its end, and the liquid cooling plate is detachably connected to the first end beam.

5. The battery pack according to claim 4, characterized in that, The second battery module has a second end beam at its end.

6. The battery pack according to claim 5, characterized in that, A first buffer component is provided between the battery cell at the outer end of the first battery module and the first end crossbeam; And / or, a second buffer component is provided between the cell at the outer end of the second battery module and the second end beam.

7. The battery pack according to claim 1 or 2, characterized in that, The first housing has a long side and a wide side, and the width of the first housing varies in different regions along its length to form a wide side region and a narrow side region within the first housing. The first battery module is provided in both the wide side region and the narrow side region. The battery cells of the module in the wide side region extend along the length of the first housing, and the battery cells of the module in the narrow side region extend along the width of the first housing.

8. The battery pack according to claim 7, characterized in that, The first battery modules in the wide side area and the narrow side area are spaced apart along the length direction of the first housing, and the liquid cooling plate is integrally formed along the length direction of the first housing.

9. The battery pack according to claim 1 or 2, characterized in that, It also includes a bottom protective plate. The first battery module is disposed on the top surface of the bottom wall of the first housing, and the bottom protective plate is disposed on the bottom surface of the bottom wall of the first housing. The gap between the bottom surface of the first battery module and the top surface of the bottom protective plate is z, and the height of the battery cell in the first battery module is h, where z ≥ 8%h.

10. The battery pack according to claim 1 or 2, characterized in that, The height of the first casing is h1, and the height of the battery cell in the first battery module is h, where 0.8 ≤ h and h1 ≤ 1.2.

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