Battery pack and electric device

Abstract

The utility model provides a battery pack and a power utilization device, the battery pack can be upwards assembled at the bottom of a mounting base body, and comprises a lower shell, a cold plate and a battery module, the lower shell is provided with a vertically-through inner cavity, and the cold plate is fixedly sealed and covered on an opening in the top end of the lower shell; the battery module is assembled in the lower shell, and the top end is contacted with the cold plate; and the bottom end opening of the lower shell can be used for loading the battery module into the lower shell. According to the battery pack, the mode that the battery pack is connected with the installation base body from bottom to top is adopted, the battery pack is more convenient to disassemble when needing to be disassembled, meanwhile, the fixedly-connected cold plate is adopted at the top of the lower shell to serve as an upper cover of the battery pack, the battery module makes contact with the cold plate for heat dissipation, and when the interior of the battery pack needs to be overhauled, the battery pack can be conveniently disassembled. And internal parts such as electric parts are directly detached from the lower part of the lower shell, so that maintenance is more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack. The present invention also relates to an electrical device having the battery pack. Background Art

[0002] With the continuous development of the new energy industry, battery packs are attracting increasing attention. A key competitive advantage of various electrical devices lies in their efficient energy storage systems, primarily provided by battery packs. As the "heart" of an electrical device, the battery pack not only stores the vast amounts of energy it requires but also directly impacts its endurance, performance, and overall safety.

[0003] Typically, battery packs are installed inside electrical devices. For example, when used in vehicles, the battery packs are closely connected to multiple subsystems such as the vehicle chassis, body structure, cooling system, electrical wiring, and the specific connection structure with the vehicle is relatively complex. Therefore, when a battery pack fails, the entire battery pack often needs to be completely removed before the internal battery pack can be inspected and repaired. Moreover, the process of disassembling and reinstalling the battery pack is often time-consuming, resulting in low inspection efficiency and the vehicle being unable to be used normally for a long time. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery pack to improve the convenience of maintenance of the battery pack.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A battery pack capable of being mounted on the bottom of a mounting base, comprising:

[0007] Lower housing, cold plate and battery module;

[0008] The lower shell has a vertically through inner cavity, the cold plate is fixedly sealed to the top opening of the lower shell, and the bottom opening of the lower shell is capable of allowing the battery module to be assembled into the lower shell;

[0009] The top of the battery module is fixed to the cold plate and generates heat exchange; the battery module includes a battery cell, the pole of the battery cell is side-exposed, and the battery cell length is ≥250mm.

[0010] Furthermore, an internal beam is provided in the lower shell, the bottom end of the internal beam is connected to a support body, and the battery cell is bonded to the upper surface of the support body.

[0011] Furthermore, a bushing is embedded in the lower shell, one end of the bushing has a flange, and the mounting base and the lower shell jointly clamp the flange.

[0012] Furthermore, the fasteners installed from bottom to top in the battery pack account for more than 80% of the total; the assembly direction of the battery module is the same as the direction in which the battery pack is assembled to the mounting base.

[0013] Furthermore, the battery pack includes a protective plate, which is detachably and sealedly connected to the bottom opening of the lower shell.

[0014] Furthermore, the distance between the battery cell and the guard plate is z, the height of the battery cell is b, and z / b≥0.08.

[0015] Furthermore, the battery cells are stacked along the width direction of the battery cells in the battery module, and adjacent battery cells in the same battery module are provided with a spacing d and filled with structural adhesive, and the width of the battery cells is a, 0.025≤d / a≤0.5.

[0016] Furthermore, the height of the entire battery pack is h, the height of the battery cell is b, and b / h≥0.82.

[0017] The battery modules are arranged in n groups along the Y direction in the lower shell, n≥1, the length direction of the battery cells is arranged along the Y direction, the length of the battery cells is c, the Y-direction width of the battery pack is w1, n*c / w1>87%.

[0018] Furthermore, a heat-conducting structural adhesive is provided between the battery core and the cold plate.

[0019] Furthermore, a seal is connected between the cold plate and the lower shell.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The battery pack described in the utility model is connected to the mounting base from bottom to top, which is more convenient when the battery pack needs to be disassembled. At the same time, the top of the lower shell adopts a fixed cold plate as the battery pack cover, and the battery module is in contact with the cold plate for heat dissipation. When the interior of the battery pack needs to be inspected, the high-voltage electrical components, BMS, etc. can be directly removed from the bottom of the lower shell, making maintenance more convenient.

[0022] Secondly, a support body is provided on the internal beam in the lower shell, and the battery cell is bonded to the support body. This allows the battery cell to be better supported by the lower shell, and the overall strength of the battery pack is higher. A bushing is embedded in the lower shell, and a flange is provided on the bushing. This allows force to be transmitted between the mounting base and the lower shell through the flange, reducing the force transmission points between the battery pack and the mounting base, and making the battery pack installation more secure. More than 80% of the fasteners in the battery pack are installed from the bottom up, and the assembly direction of the battery module is the same as the assembly direction of the battery pack, which can make the assembly of the battery pack more convenient. A protective plate is provided at the bottom end of the lower shell to protect the internal parts of the battery pack, preventing external objects from directly impacting the internal parts.

[0023] Furthermore, a ratio of the distance between the cell and the guard plate to the cell height of 0.08 or greater ensures ample clearance at the bottom of the battery pack, allowing for exhaust and a larger gap for impact. Stacking the cells along their width allows for better utilization of the space within the battery pack. Filling the cells with structural adhesive improves the overall strength of the battery module and isolates adjacent cells. A ratio of the cell height to the overall height of the battery pack of 0.82 or greater improves space utilization in the Z direction within the battery pack, increasing the energy density of the battery pack.

[0024] In addition, the battery cells within the lower shell account for more than 87% of the battery pack's width in the Y direction, enabling the cells to better utilize the Y-direction space within the battery pack. Thermally conductive structural adhesive is installed between the battery cells and the cold plate, which securely connects the cells to the cold plate and enhances the overall structural strength and modality of the battery pack. The thermally conductive adhesive also provides excellent thermal conductivity, efficiently transferring heat from the cells to the cold plate and improving the cooling effect. A sealant is connected between the cold plate and the lower shell, further enhancing the seal between the two.

[0025] Another object of the present invention is to provide an electrical device provided with the battery pack as described above.

[0026] The power-consuming device described in the present invention has the same beneficial effects as the battery pack described above relative to the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a schematic structural diagram of the battery pack according to the first embodiment of the present invention;

[0029] Figure 2This is an exploded view of the battery pack according to the first embodiment of the present invention;

[0030] Figure 3 This is a schematic structural diagram of the battery module according to the first embodiment of the present invention;

[0031] Figure 4 This is a schematic structural diagram of the battery cell according to the first embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the internal structure of the battery pack according to the first embodiment of the present invention;

[0033] Figure 6 for Figure 5 A partial enlarged view of part A in the middle;

[0034] Figure 7 This is a schematic structural diagram of the lower housing when it is inverted according to the first embodiment of the present invention;

[0035] Figure 8 This is a structural schematic diagram of the bushing described in Example 1 of the present utility model.

[0036] Description of reference numerals:

[0037] 1. Lower shell;

[0038] 101. Internal beam; 102. Side beam;

[0039] 2. Cold plate;

[0040] 3. Battery module;

[0041] 301, battery cell; 302, structural adhesive;

[0042] 4. Guard plate;

[0043] 5. Support body;

[0044] 6. Bushing;

[0045] 601. Flange. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0047] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0048] Taking the vehicle in which the battery pack described in this utility model is located as an example, the directional terms used in the embodiments, such as "up, down, left, right, front, and rear," are defined based on the vehicle's up-down direction (also known as the height direction, or the vehicle's Z direction), left-right direction (also known as the width direction, or the vehicle's Y direction), and front-back direction (also known as the length direction, or the vehicle's X direction). "Inside" and "outside" are defined based on the outline of the corresponding component. For example, if "inside" and "outside" are defined based on the vehicle's outline, the side closest to the center of the vehicle is considered "inside," and the opposite side is considered "outside."

[0049] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0050] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0051] Example 1

[0052] This embodiment relates to a battery pack to improve the convenience of maintenance of the battery pack.

[0053] In terms of overall structure, a battery pack of this embodiment can be assembled on the bottom of a mounting base, including:

[0054] Lower housing, cold plate and battery module;

[0055] The lower shell has a vertically through inner cavity, the cold plate is fixedly sealed to the top opening of the lower shell, and the bottom opening of the lower shell is capable of allowing the battery module to be assembled into the lower shell;

[0056] The top of the battery module is fixed to the cold plate and generates heat exchange; the battery module includes a battery cell, the pole of the battery cell is side-exposed, and the battery cell length is ≥250mm.

[0057] As configured above, the battery pack of this embodiment is connected to the mounting base from bottom to top, making it easier to remove the battery pack. A cold plate is fixed to the top of the lower housing, serving as the battery pack cover. The battery modules are in contact with the cold plate for heat dissipation. When the battery pack requires internal maintenance, high-voltage electrical components and the BMS (battery management system) can be directly removed from below the lower housing, further facilitating repairs. The battery cell poles are side-exiting and are longer than 250mm, making better use of the space within the lower housing of this embodiment.

[0058] Based on the above overall introduction, specifically, refer to Figure 1 and Figure 2 As shown, the mounting base in this embodiment is the vehicle chassis. The orientation of the battery pack after installation on the vehicle is used as the reference, i.e., the vehicle's X, Y, and Z directions are used as the reference orientation for the battery pack. The battery pack is mounted upward along the Z direction at the bottom of the mounting base, secured with bolts. It should be noted that the mounting base can also be other electrical equipment or structures, as long as they can improve convenience by installing the battery pack from below.

[0059] Fasteners installed from bottom to top within the battery pack account for over 80% of the total. The assembly direction of the battery module is the same as the direction in which the battery pack is assembled to the mounting base. Fasteners within the battery pack, including bolts, nuts, screws, pins, rivets, etc., are installed from bottom to top, allowing operators to disassemble and assemble internal components while the battery pack is connected to the vehicle, improving assembly convenience. The battery module and battery pack have the same assembly direction, making it easier to install the battery module into the lower housing from below, facilitating assembly of the battery pack.

[0060] In this embodiment, the cold plate 2 is liquid-cooled, with a water inlet and outlet provided on one side. The cold plate 2 is fixedly connected to the housing, specifically by riveting, bolting, or gluing. In this embodiment, the cold plate 2 is connected to the lower housing 1 via rivets. A sealant is provided between the cold plate 2 and the lower housing 1 to enhance the sealing performance between the lower housing 1 and the cold plate 2. The sealant may be a sealing strip, sealant, or the like. In this embodiment, the sealant is sealant.

[0061] In addition, in order to better protect the internal parts of the battery pack, the battery pack includes a protective plate 4, which is detachably sealed and connected to the bottom opening of the lower shell 1. The protective plate 4 is provided at the bottom end of the lower shell 1 to protect the parts inside the battery pack, so that external objects will not directly impact the internal parts, thereby improving the safety performance of the battery pack. The connection between the protective plate 4 and the lower shell 1 can be a bolt connection. With this arrangement, when the battery pack needs to be inspected and repaired during use, the bolts can be directly unscrewed and the protective plate 4 can be removed for inspection. Compared with the existing technology, the provision of a maintenance port on the battery pack is eliminated, making the battery pack structure simpler. Of course, the connection between the protective plate 4 and the lower shell 1 can also be a snap connection or other detachable connection method, as long as the protective plate 4 can be detachably connected and sealed to the lower opening of the lower shell 1.

[0062] Regarding the composition structure of the battery module 3, refer to Figures 3 to 6 As shown, the battery module 3 of this embodiment includes a battery cell 301, and a thermally conductive structural adhesive 302 is provided between the battery cell 301 and the cold plate 2. The thermally conductive structural adhesive 302 is provided between the battery cell 301 and the cold plate 2, which can connect the battery cell 301 to the cold plate 2 more firmly, so that the battery pack can better utilize the structural strength of the cold plate 2 itself, improve the overall structural strength and modality of the battery pack, and is not easily deformed when the battery pack is subjected to external forces. At the same time, the thermally conductive structural adhesive 302 can also completely fill the gap between the battery cell 301 and the cold plate 2. The thermally conductive structural adhesive 302 has a good thermal conductivity, so that the cross-section of the battery cell 301 to transfer heat to the cold plate 2 is larger, and the heat generated by the battery cell 301 can be efficiently transferred to the cold plate 2, thereby improving the cooling effect of the cold plate 2 on the battery cell 301.

[0063] Among them, the battery cell 301 of this embodiment is a side-outlet pole, refer to Figure 2 、 Figure 4 and Figure 6 As shown, the poles of the battery cell 301 are led out from the non-Z direction. The specific type of battery cell 301 can be a blade battery cell 301 with a length of 350mm to 1000mm, and its two poles are respectively arranged at the two ends in the upward direction of the length. At least one explosion-proof valve is provided on the battery cell 301 to promptly discharge the internal smoke when the battery cell 301 experiences thermal runaway. The distance between the battery cell 301 and the guard plate 4 is z, and the height of the battery cell 301 is b. z / b ≥ 0.08. This arrangement can leave space at the bottom of the battery pack. When the battery pack experiences thermal runaway, the smoke generated can be discharged through the space between the battery cell 301 and the guard plate 4. At the same time, the gap between the battery cell 301 and the guard plate 4 can also increase the ball impact gap at the bottom of the battery pack, thereby improving the safety performance of the battery pack in the ball impact test. In this embodiment, z / b = 0.08.

[0064] In addition, the battery cells 301 are stacked along the width direction of the battery cells 301 in the battery module 3. Figure 3 、 Figure 5 and Figure 6 As shown, adjacent cells 301 in the same battery module 3 are spaced apart by a spacing d and filled with structural adhesive 302. The width of the cell 301 is a, and 0.025≤d / a≤0.5. In this embodiment, d / a=0.5. The cells 301 in this embodiment are arranged sideways, that is, the large surface of the cell 301 is perpendicular to the XY plane, and the poles of the cell 301 extend along the Y direction. Stacking the cells 301 along their width can better utilize the space within the battery pack, making the battery module 3 more compact after grouping. Filling the cells 301 with structural adhesive 302 can ensure a certain connection strength between the cells 301, thereby improving the overall strength of the battery module 3. At the same time, the structural adhesive 302 also serves to isolate adjacent cells 301, so that when a cell 301 overheats, it will not excessively affect the adjacent cells 301.

[0065] Furthermore, refer to Figure 3 、 Figure 5 and Figure 6 As shown, the overall height of the battery pack is h, the height of the battery cell 301 is b, and b / h ≥ 0.82. A higher b / h ratio increases the space utilization of the battery cell 301 in the Z direction within the battery pack. Consequently, a higher space utilization rate can increase the equivalent density of the battery pack. It's important to note that b / h should not be too large, as space must be left between the battery cell 301 and the guard plate 4 for smoke emissions in the event of thermal runaway.

[0066] For the specific arrangement of the battery module 3 in the lower housing 1, refer to Figure 1 、 Figure 2 and Figure 4 As shown, the battery modules 3 are provided in n groups along the Y direction in the lower shell 1, where n≥1. The number of battery modules 3 provided in the lower shell 1 along the X direction can be selected as needed. In this embodiment, the battery modules 3 are provided in three groups along the Y direction and two groups along the X direction in the lower shell 1, for a total of six groups. The length direction of the battery cell 301 is provided along the Y direction, the length of the battery cell 301 is c (excluding the pole), the width of the entire battery pack in the Y direction is w1, and n*c / w1>87%. The battery cell 301 in the lower shell 1 accounts for more than 87% of the width of the battery pack in the Y direction, which enables the battery cell 301 to better utilize the Y-direction space in the battery pack, so that the battery pack has a higher energy density.

[0067] For the purpose of improving the installation firmness of the battery cell 301 in the battery pack, refer to Figure 2 and Figure 7As shown, in this embodiment, an internal beam 101 is provided in the lower shell 1, and the bottom end of the internal beam 101 is connected to the support body 5, and the battery cell 301 is bonded to the upper surface of the support body 5. Specifically, the lower shell 1 includes a side beam 102 and an internal beam 101. The side beam 102 forms a rectangular frame, and the internal beam 101 separates the inner cavity of the lower shell 1, leaving space for accommodating the battery module 3 and electrical components. The support body 5 and the internal beam 101 are connected by bolts to form a fulcrum for the battery cell 301. The battery cell 301 is bonded to the support body 5 by structural adhesive 302, so that the weight of the battery cell 301 can be transferred to the internal beam 101 through the support body 5, so that the lower shell 1 can better support the battery cell 301.

[0068] In order to improve the installation firmness of the lower shell 1, refer to Figure 1 and Figure 8 As shown, in this embodiment, a bushing 6 is embedded in the lower housing 1. One end of the bushing 6 has a flange 601, and the mounting base and the lower housing 1 jointly clamp the flange 601. The bushing 6 embedded in the lower housing 1 and provided with the flange 601 enable force to be transmitted between the mounting base and the lower housing 1 through the flange 601, reducing the force transmission points between the battery pack and the mounting base and ensuring a more secure installation of the battery pack. In this embodiment, bolts are passed through the bushing 6 and fastened to the mounting base, securing the battery pack below the mounting base.

[0069] The assembly method of the battery pack of this embodiment is as follows: after installing the cold plate 2 on the lower shell 1, invert the lower shell 1, and load the battery module 3, electrical components, support body 5 and other parts into the lower shell 1, then install the guard plate 4 and tighten it in place, flip the battery pack over when installing it to the mounting base, install and tighten the bolts to fix the battery pack to the bottom end of the mounting base to complete the assembly.

[0070] Example 2

[0071] This embodiment relates to an electrical device, which is provided with the battery pack in the first embodiment.

[0072] By placing the battery pack of Example 1 at the bottom of the electrical device, maintenance can be performed by simply removing the protective plate. This facilitates access to the interior of the battery pack without removing the entire battery pack, improving maintenance efficiency. Furthermore, by placing the cold plate on top of the battery pack of Example 1, the internal cells utilize more efficient space, increasing the energy density of the battery pack and improving the performance of the electrical device.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack capable of being mounted on the bottom of a mounting base, characterized in that: include: Lower housing, cold plate and battery module; The lower shell has a vertically through inner cavity, the cold plate is fixedly sealed to the top opening of the lower shell, and the bottom opening of the lower shell is capable of allowing the battery module to be assembled into the lower shell; The top of the battery module is fixed to the cold plate and generates heat exchange; the battery module includes a battery cell, the pole of the battery cell is side-exposed, and the battery cell length is ≥250mm.

2. The battery pack according to claim 1, wherein: An internal beam is provided in the lower shell, the bottom end of the internal beam is connected to a support body, and the battery core is bonded to the upper surface of the support body.

3. The battery pack according to claim 1, wherein: A bushing is embedded in the lower shell, one end of the bushing is provided with a flange, and the mounting base and the lower shell jointly clamp the flange.

4. The battery pack according to claim 1, wherein: The fasteners installed from bottom to top in the battery pack account for more than 80% of the total; the assembly direction of the battery module is the same as the direction in which the battery pack is assembled to the mounting base.

5. The battery pack according to claim 1, wherein: The battery pack includes a protective plate, which is detachably and sealedly connected to the bottom opening of the lower shell.

6. The battery pack according to claim 5, wherein: The distance between the battery cell and the guard plate is z, the height of the battery cell is b, and z / b≥0.

08.

7. The battery pack according to claim 1, wherein: The battery cells are stacked along the width direction of the battery cells in the battery module, adjacent battery cells in the same battery module are provided with a spacing d and filled with structural adhesive, the width of the battery cells is a, 0.025≤d / a≤0.5; and / or, The entire height of the battery pack is h, the height of the battery cell is b, and b / h≥0.

82.

8. The battery pack according to claim 1, wherein: The battery modules are arranged in n groups along the Y direction in the lower shell, n≥1, the length direction of the battery cells is arranged along the Y direction, the length of the battery cells is c, the Y-direction width of the battery pack is w1, n*c / w1>87%.

9. The battery pack according to any one of claims 1 to 8, characterized in that: A heat-conducting structural adhesive is provided between the battery core and the cold plate; and / or, A sealing member is connected between the cold plate and the lower shell.

10. An electrical device, characterized in that: The electrical device is provided with a battery pack according to any one of claims 1 to 9.

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