Battery pack and power device

Abstract

The utility model provides a battery pack and a power device. The battery pack comprises an upper shell integrated with a liquid cooling plate, the upper shell comprises an upper shell frame and a liquid cooling plate, a hollow hole is formed in the middle of the upper shell frame, the liquid cooling plate is connected with the upper shell frame and blocks the hollow hole, a containing groove is defined by the upper shell frame and the liquid cooling plate, and the top of the battery module is located in the containing groove and connected with the liquid cooling plate; the ratio i of the distance from the bottom of the upper shell frame to the top of the liquid cooling plate to the height of the battery module meets the condition that i is greater than or equal to 0.06 and less than or equal to 0.8. According to the battery pack disclosed by the utility model, the upper shell is simple in structure and convenient to prepare and form, the integration of the liquid cooling plate is facilitated, and the liquid cooling plate integrated on the upper shell can enable the battery module to be kept at the optimal working temperature, so that the battery pack has a very good using effect.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery pack. The utility model also relates to a power device provided with the battery pack. Background Art

[0002] At present, in terms of the structure of the battery pack, the liquid cooling plate is arranged at the bottom of the lower shell, which makes the lower shell heavy and the side beams high. In addition, due to its arrangement at the bottom, the strength and rigidity of the liquid cooling plate are poor. To solve this problem, it is usually necessary to set a reinforcement plate under the liquid cooling plate, which makes the battery pack heavy and is not conducive to improving the space utilization. Utility Model Content

[0003] In view of this, the utility model aims to provide a battery pack to improve the space utilization of the battery pack.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A battery pack includes an upper housing integrated with a liquid cooling plate;

[0006] The upper shell includes an upper shell frame with a hollow hole formed in the middle, and a liquid cooling plate connected to the upper shell frame and blocking the hollow hole, the upper shell frame and the liquid cooling plate are surrounded by a receiving groove, the top of the battery module is located in the receiving groove and connected to the liquid cooling plate;

[0007] The ratio i of the distance between the bottom of the upper shell frame and the top of the liquid cooling plate and the height of the battery module satisfies: 0.06≤i≤0.8.

[0008] Furthermore, the upper shell frame has a frame body composed of multiple vertical plates connected end to end in sequence, and an upper connecting flange connected to the top of each vertical plate and extending toward the inside of the frame body, and a lower connecting flange connected to the bottom of each vertical plate and extending toward the outside of the frame body; the upper connecting flange is connected to the liquid cooling plate, and the lower connecting flange is connected to the lower shell of the battery pack.

[0009] Furthermore, a seal is provided between the lower connecting flange and the lower shell.

[0010] Furthermore, the liquid cooling plate has a flow channel plate and a support plate that are snap-fitted together, and a coolant flow channel is formed between the flow channel plate and the support plate; the flow channel plate and the support plate are respectively provided with a first overlapping edge and a second overlapping edge in the circumferential direction, the second overlapping edge is located between the first overlapping edge and the upper connecting flange, and the first overlapping edge, the second overlapping edge and the upper connecting flange are welded together.

[0011] In the height direction of the battery pack, the height of the cooling liquid flow channel is between 1 mm and 5 mm; and / or the liquid inlet and outlet modules of the liquid cooling plate are arranged on the support plate.

[0012] Furthermore, the battery module and the liquid cooling plate are connected by gluing, and the thickness of the glue layer is between 0.2 mm and 4 mm.

[0013] Furthermore, the battery module has a plurality of single cells stacked together, and a pole of each of the single cells is located in the length direction of the battery module or in the width direction of the battery module.

[0014] Furthermore, the side surface of each of the single cells that is bonded to the liquid cooling plate has a glue-coated area, and the area of ​​the glue-coated area accounts for 60%-100% of the total area of ​​the side surface.

[0015] Furthermore, the bonding length between each of the single battery cells and the liquid cooling plate accounts for 80%-98% of the total length of the aluminum shell of each of the single battery cells.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The battery pack described in the utility model is provided with an upper shell body that adopts an upper shell body frame with a hollowed-out middle portion, and the liquid cooling plate is connected to the upper shell body frame and blocked at the hollowed-out hole position, and a receiving groove for accommodating the top of the battery module is formed between the upper shell body frame and the liquid cooling plate, and at the same time, the ratio between the distance between the bottom of the upper shell body frame and the top of the liquid cooling plate and the height value of the battery module is limited, which not only makes the upper shell body structure simple and easy to prepare and form, but also facilitates the integration of the liquid cooling plate, and can improve the space utilization rate of the battery pack, and at the same time, the liquid cooling plate integrated on the upper shell body can keep the battery module at the optimal operating temperature, thereby having a good use effect.

[0018] In addition, the upper shell frame adopts a frame body and an upper connecting flange and a lower connecting flange connected to the frame body. The structure is simple and easy to prepare and form. The setting of the upper connecting flange is conducive to the connection of the liquid cooling plate and to ensuring the reliability of the connection between the upper shell frame and the liquid cooling plate. The setting of the lower connecting flange is convenient for the connection between the upper shell frame and the lower shell and to ensure the reliability of the connection between the upper shell frame and the lower shell.

[0019] Secondly, the seal provided between the lower connecting flange and the lower shell helps to ensure the sealing of the connection between the upper shell and the lower shell. The liquid cooling plate adopts a flow channel plate and a support plate that are connected by snapping, which has a simple structure and is easy to process and prepare. The flow channel plate, the support plate and the upper connecting flange are connected together to form a three-layer structure, which can help to improve the rigidity of the liquid cooling plate. The height limitation of the coolant flow channel can ensure a better cooling effect while ensuring that the overall thickness of the liquid cooling plate is thin. The inlet and outlet liquid modules on the liquid cooling plate are arranged on the support plate, which can facilitate the structural arrangement of the inlet and outlet liquid modules.

[0020] In addition, the battery module and the liquid cooling plate are bonded together by a thermally conductive structural adhesive, and the thickness of the thermally conductive structural adhesive is limited, so as to ensure the reliability of the connection between the battery module and the liquid cooling plate while facilitating the conduction of heat. The battery module adopts a single cell with a long strip structure, that is, a long cell, which makes the module size large and the variety small, easy to assemble, and makes the layout in the battery pack more flexible and structurally sound. Setting the area of ​​the glue coating area is conducive to ensuring the reliability of the connection between each single cell and the liquid cooling plate. Setting the bonding length between each single cell and the liquid cooling plate is also conducive to ensuring the reliability of the connection between each single cell and the night cooling plate.

[0021] Another object of the present invention is to provide a power device, on which the battery pack as described above is provided.

[0022] The power device of the present invention and the battery pack as described above have the same beneficial effects as those of the prior art, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the structure of the battery pack according to an embodiment of the utility model;

[0025] Figure 2 A partial enlarged view of the battery pack according to an embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the upper housing according to an embodiment of the utility model;

[0027] Figure 4 This is an exploded view of the upper housing according to an embodiment of the utility model;

[0028] Figure 5 This is a structural schematic diagram of the frame body described in an embodiment of the utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the liquid cooling plate according to an embodiment of the utility model;

[0030] Figure 7 This is a schematic structural diagram of the lower housing with a battery module installed according to an embodiment of the utility model from a first perspective;

[0031] Figure 8 A schematic diagram of the structure of the lower housing equipped with a battery module according to an embodiment of the utility model from a second viewing angle;

[0032] Fig. 9 This is a schematic diagram of the structure of a single cell according to an embodiment of the utility model;

[0033] Description of reference numerals:

[0034] 1. Upper shell; 2. Lower shell; 3. Battery module; 4. Module support plate;

[0035] 10. Thermal conductive structural adhesive; 11. Upper shell frame; 111. Frame body; 112. Upper connecting flange; 113. Lower connecting flange; 12. Liquid cooling plate; 120. Cooling liquid flow channel; 121. Flow channel plate; 122. Support plate; 123. Liquid inlet and outlet module; 1211. First overlapping edge; 1221. Second overlapping edge; 30. Single battery cell; 301. Pole. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 an indirect connection 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 in combination with specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] Embodiment 1

[0041] This embodiment relates to a battery pack, which has an overall structure such as Figures 1 to 6 As shown, the battery pack includes an upper shell 1 integrated with a liquid cooling plate 12. The upper shell 1 includes an upper shell frame 11 with a hollow hole formed in the middle, and a liquid cooling plate 12 connected to the upper shell frame 11 and blocked at the hollow hole. The upper shell frame 11 and the liquid cooling plate 12 are surrounded to form a receiving groove, and the top of the battery module 3 is located in the receiving groove and connected to the liquid cooling plate 12. In addition, the ratio i between the distance from the bottom of the upper shell frame 11 to the top of the liquid cooling plate 12 and the height value of the battery module 3 satisfies: 0.06≤i≤0.8.

[0042] At this time, the upper shell 1 adopts an upper shell frame 11 with a hollow middle part, and the liquid cooling plate 12 is blocked at the hollow hole, so that a receiving groove for accommodating the top of the battery module 3 is formed between the upper shell frame 11 and the liquid cooling plate 12, and the ratio of the overall height of the upper shell 1 to the height of the battery module 3 is limited. Not only does the upper shell 1 have a simple structure and is easy to prepare and form, but it is also conducive to the integration of the liquid cooling plate 12, which can improve the space utilization of the battery pack. At the same time, the liquid cooling plate 12 integrated on the upper shell 1 can keep the battery module 3 at the optimal operating temperature.

[0043] Based on the above overall introduction, specifically, continue to refer to Figures 1 to 6 As shown, in this embodiment, the upper shell frame 11 has a frame body 111 connected end to end by a plurality of vertical plates, an upper connecting flange 112 connected to the top of each vertical plate and extending to the inside of the frame body 111, and a lower connecting flange 113 connected to the bottom of each vertical plate and extending to the outside of the frame body 111. The upper connecting flange 112 is connected to the liquid cooling plate 12, and the lower connecting flange 113 is connected to the lower shell 2 of the battery pack.

[0044] By providing the upper shell frame 11 with a frame body 111, an upper connection flange 112 and a lower connection flange 113, the structure is simple and easy to form and prepare. The provision of the upper connection flange 112 is conducive to ensuring the reliability of the connection between the upper shell frame 11 and the liquid cooling plate 12, and the provision of the lower connection flange 113 is conducive to ensuring the reliability of the connection between the upper shell frame 11 and the lower shell 2.

[0045] In specific implementation, the upper shell frame 11 is formed by stamping, and its thickness is usually thin, about 1 mm or less, which can ensure sufficient structural strength while reducing the weight of the upper shell 1, thereby realizing a lightweight design of the battery pack. In addition, in this embodiment, the ratio i between the distance from the bottom of the upper shell frame 11 to the top of the liquid cooling plate 12 and the height value b of the battery module 3 can be set to, for example, 0.06, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75 or 0.8, etc.

[0046] The liquid cooling plate 12 of this embodiment, as a preferred embodiment, has a flow channel plate 121 and a support plate 122 that are connected by buckling, and a cooling liquid flow channel 120 is formed between the flow channel plate 121 and the support plate 122. Specifically, a flow channel groove is formed on the flow channel plate 121, and corresponding to the flow channel groove, a concave plane that is recessed toward one side of the battery module 3 is formed on the support plate 122. When the flow channel plate 121 and the support plate 122 are buckled and connected, the above-mentioned cooling liquid flow channel 120 is formed between the flow channel groove and the concave plane, and the outer side of the concave plane on the support plate 122 is bonded and connected to the battery module 3.

[0047] Moreover, in this embodiment, if Figure 2 As shown, the flow channel plate 121 and the support plate 122 are respectively provided with a first overlapping edge 1211 and a second overlapping edge 1221 in the circumferential direction, and the second overlapping edge 1221 is located between the first overlapping edge 1211 and the upper connecting flange 112, and the first overlapping edge 1211, the second overlapping edge 1221 and the upper connecting flange 112 are welded together. At this time, the flow channel plate 121, the support plate 122 and the upper connecting flange 112 are connected together to form a three-layer structure, which can be beneficial to improving the rigidity of the liquid cooling plate 12.

[0048] In a specific implementation, as a preferred method, the first overlap edge 1211 and the second overlap edge 1221 can be brazed together to form the liquid cooling plate 12. Then the liquid cooling plate 12 and the upper connection flange 112 are welded together, so that the entire upper shell 1 does not need to be brazed, which can save production processes and storage space. In addition, the effective welding size between the first overlap edge 1211 and the second overlap edge 1221 is preferably greater than 7 mm to ensure the reliability of the welding connection.

[0049] In this embodiment, the liquid inlet and outlet module 123 on the liquid cooling plate 12 is specifically arranged on the support plate 122. The liquid inlet and outlet module 123 may include, for example, a coolant inlet pipe, a coolant outlet pipe, and connectors such as pipe joints. At this time, arranging the liquid inlet and outlet module 123 on the support plate 122 can facilitate the structural arrangement of the liquid inlet and outlet module 123.

[0050] As a preferred implementation, in this embodiment, in the height direction of the battery pack, the height h of the coolant channel 120 is between 1mm and 5mm. By limiting the height h of the coolant channel 120, a better cooling effect can be ensured, while ensuring that the overall thickness of the liquid cooling plate 12 is relatively thin. The inlet and outlet liquid modules 123 on the liquid cooling plate 12 are arranged on the support plate 122, which can facilitate the structural arrangement of the inlet and outlet liquid modules 123. In specific implementation, the height h of the coolant channel 120 can be set to 1mm, 2mm, 3mm, 4mm or 5mm, for example.

[0051] In addition, it should be noted that, in order to improve the performance of the liquid cooling plate 12 , in this embodiment, a thermal insulation coating or thermal insulation cotton may also be provided on the upper surface of the liquid cooling plate 12 .

[0052] In this embodiment, a seal is provided between the lower connection flange 113 on the upper shell 1 and the lower shell 2. The seal is preferably a sealing ring, which helps to ensure the sealing of the connection between the upper shell 1 and the lower shell 2. Figure 7 and Figure 8 The lower housing 2 of this embodiment also forms a receiving cavity for receiving the battery module 3, and the receiving cavity and the receiving cavity on the upper housing 1 together form a relatively closed space. A module support plate 4 is provided at the bottom of the lower housing 2 for supporting the battery module 3.

[0053] Among them, the battery module 3 is bonded to the module support plate 4 by a thermally conductive structural adhesive 10. In addition, the module support plate 4 can be a plurality of long strips arranged at intervals, or a whole plate that supports the entire bottom of the battery module 3. In addition, the ratio n between the height value a of the lower shell 2 and the height value b of the battery cell is between 0.25-1.1. In specific implementation, the ratio n can be set to 0.25, 0.5, 0.7, 0.75, 1.0, 1.05, or 1.1, etc.

[0054] In this embodiment, the battery module 3 and the liquid cooling plate 12 are connected by gluing, and the thickness of the glue layer is between 0.2mm-4mm. Specifically, the battery module 3 and the liquid cooling plate 12 are connected by gluing through the thermal conductive structural adhesive 10, that is, the thickness of the thermal conductive structural adhesive 10 is between 0.2mm-4mm. In this way, while ensuring the reliability of the connection between the battery module 3 and the liquid cooling plate 12, it is also beneficial to the conduction of heat. In the specific implementation, the thickness of the thermal conductive structural adhesive 10 can be set to 0.2mm, 0.3mm or 0.4mm, for example.

[0055] As a preferred implementation, in this embodiment, Figures 7 to 9As shown, the battery module 3 has a plurality of stacked single cells 30, wherein each single cell 30 is in a long strip structure, that is, each single cell 30 adopts a blade cell, and the pole 301 of each single cell 30 is located in the length direction of the battery module 3 or in the width direction of the battery module 3. The battery module 3 adopts a single cell 30 with a long strip structure, that is, a long cell, so that the module size is large, the types are few, and it is easy to assemble, and the layout in the battery pack is more flexible and the structure is good.

[0056] The length c of each single cell 30 (excluding the size of the pole 301), i.e. the length c of the aluminum shell of the cell, is usually about 350mm-1000mm, and the height of the cell is usually not more than 160mm. The two poles 301 are located at both ends of the length direction of the single cell 30. In order to ensure the expansion reliability of the single cell 30, a gap is set between adjacent single cells 30, and the gap is about 0.2mm-0.3mm.

[0057] In addition, in this embodiment, as a preference, the side surface of each single battery cell 30 that is bonded to the liquid cooling plate 12 has a glue-coated area, and the area of ​​the glue-coated area accounts for 60%-100% of the total area of ​​the side surface. The setting of the area of ​​the glue-coated area is conducive to ensuring the reliability of the connection between each single battery cell 30 and the liquid cooling plate 12. In specific implementation, the area of ​​the glue-coated area accounts for 60%, 70%, 80%, 90% or 100% of the total area of ​​the side surface.

[0058] Also as a preference, in this embodiment, the bonding length between each single cell 30 and the liquid cooling plate 12 accounts for 80%-98% of the total length of the aluminum shell of each single cell 30. The bonding length between each single cell 30 and the liquid cooling plate 12 is also conducive to ensuring the reliability of the connection between each single cell 30 and the night cooling plate. In specific implementation, the bonding length accounts for 80%, 83%, 85%, 87%, 90%, 92%, 95% or 98% of the total length of the aluminum shell of each single cell 30.

[0059] The battery pack of this embodiment integrates a liquid cooling plate 12 on the upper shell 1, which not only makes the upper shell 1 simple in structure and easy to prepare and form, but also improves the space utilization of the battery pack. The liquid cooling plate 12 integrated on the upper shell 1 can keep the battery module 3 at the optimal operating temperature, thereby having a good use effect.

[0060] Embodiment 2

[0061] This embodiment relates to a power device, which is provided with the battery pack of Embodiment 1. The power device may be, for example, a vehicle such as a passenger car, a commercial vehicle or a special vehicle, or it may also be other equipment using a battery pack as a power source.

[0062] The power device of this embodiment adopts the battery pack of the first embodiment so that the liquid cooling plate 12 is integrated on the upper shell 1, which can improve the space utilization of the battery pack and also keep the battery module 3 at the best working stability, thereby improving the performance of the power device.

[0063] The above description is only a preferred embodiment of the present invention and is 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 in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: including an upper housing integrated with a liquid cooling plate; The upper shell includes an upper shell frame with a hollow hole formed in the middle, and a liquid cooling plate connected to the upper shell frame and blocking the hollow hole, the upper shell frame and the liquid cooling plate are surrounded by a receiving groove, the top of the battery module is located in the receiving groove and connected to the liquid cooling plate; The ratio i of the distance between the bottom of the upper shell frame and the top of the liquid cooling plate and the height of the battery module satisfies: 0.06≤i≤0.

8.

2. The battery pack according to claim 1, characterized in that: The upper shell frame comprises a frame body which is connected end to end by a plurality of vertical plates, an upper connecting flange connected to the top of each vertical plate and extending toward the inside of the frame body, and a lower connecting flange connected to the bottom of each vertical plate and extending toward the outside of the frame body; The upper connecting flange is connected to the liquid cooling plate, and the lower connecting flange is connected to the lower shell of the battery pack.

3. The battery pack according to claim 2, characterized in that: A sealing member is provided between the lower connecting flange and the lower shell body.

4. The battery pack according to claim 2, characterized in that: The liquid cooling plate comprises a flow channel plate and a support plate which are connected by buckling, and a cooling liquid flow channel is formed between the flow channel plate and the support plate; The flow channel plate and the support plate are provided with a first overlapping edge and a second overlapping edge in the circumference thereof, respectively. The second overlapping edge is located between the first overlapping edge and the upper connecting flange, and the first overlapping edge, the second overlapping edge and the upper connecting flange are welded together.

5. The battery pack according to claim 4, characterized in that: In the height direction of the battery pack, the height of the coolant flow channel is between 1 mm and 5 mm; and / or, The liquid inlet and outlet modules of the liquid cooling plate are arranged on the supporting plate.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The battery module and the liquid cooling plate are connected by gluing, and the thickness of the glue layer is between 0.2 mm and 4 mm.

7. The battery pack according to claim 6, characterized in that: The battery module comprises a plurality of stacked single cells, and a pole of each of the single cells is located in the length direction of the battery module or in the width direction of the battery module.

8. The battery pack according to claim 7, characterized in that: The side surface of each single battery cell which is bonded to the liquid cooling plate has a glue-coated area, and the area of ​​the glue-coated area accounts for 60%-100% of the total area of ​​the side surface.

9. The battery pack according to claim 7, characterized in that: The bonding length between each of the single battery cells and the liquid cooling plate accounts for 80%-98% of the total length of the aluminum shell of each of the single battery cells.

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

Images