A battery pack

Abstract

The utility model provides a kind of battery pack, including bottom tray and box, the box has the accommodating groove of downward opening, the box is connected on the tray and is enclosed together to form accommodating cavity, battery module is equipped in the accommodating cavity, the battery module at least includes the first module and the second module of laminated arrangement, and intermediate liquid cooling plate is connected between the first module and the second module.Not only improve space utilization efficiency, and improve the single liquid cooling plate heat preservation performance by intermediate liquid cooling plate, reduce customer use cost and battery pack manufacturing cost.

Description

Technical Field

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

[0002] With the accelerated electrification of heavy-duty trucks, the market has placed higher demands on electric heavy-duty trucks, mainly in terms of core performance indicators such as long range, low energy consumption, super-fast charging, and long lifespan. These goals directly drive the rapid development of power battery systems towards lightweighting, high energy density, high volume utilization, high current carrying capacity, and long cycle life.

[0003] Currently, mainstream electric heavy-duty truck battery packs generally adopt a standardized architecture of single-layer modules, which results in the battery pack's vertical space not being fully utilized, limiting the battery capacity per unit volume and restricting the improvement of system energy density; this structure has obvious shortcomings in terms of system integration and space utilization efficiency. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a battery pack, including a bottom tray and a housing, the housing having a downward-opening receiving groove, the housing being connected to the top of the tray and enclosing it to form a receiving cavity, a battery module being provided in the receiving cavity, at least one end of the battery module in the horizontal direction being provided with a busbar structure, the busbar structure being located above the top of the bottom tray, the battery module including at least a first module and a second module stacked together, and an intermediate liquid cooling plate being connected between the first module and the second module.

[0005] Furthermore, the bottom pallet includes a pallet frame and a pallet cold plate that are fixedly connected to each other. The first module is connected to the pallet cold plate, and the first module has first module end plates at both ends that mechanically constrain it. The first module end plates are fixedly connected to the pallet frame.

[0006] Furthermore, the second module has end plates at both ends for mechanical constraint, and the second module end plates are fixedly connected to the intermediate liquid cooling plate and the first module end plate.

[0007] Furthermore, the intermediate liquid cooling plate includes a liquid cooling base plate, a first temperature distribution plate, and a second temperature distribution plate, with the first temperature distribution plate and the second temperature distribution plate respectively disposed on the upper and lower sides of the liquid cooling base plate.

[0008] Furthermore, there are multiple boxes, and the multiple boxes are stacked along the height direction. Two adjacent boxes are enclosed together to form a receiving cavity, and a battery module is provided in the receiving cavity.

[0009] Furthermore, the enclosure includes an enclosure frame and an enclosure liquid cooling plate. The enclosure liquid cooling plate is integrated on the enclosure frame and connected to the first module on its upper side. The first module has first module end plates at both ends for mechanical constraint, and the first module end plates are fixedly connected to the enclosure.

[0010] Furthermore, the bottom of the box is fixedly connected to the tray by bolts around its perimeter, and the bottom of the upper box is fixedly connected to the lower box by bolts around its perimeter.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. The battery pack of this utility model features a double-layer battery module within a single housing cavity, with an intermediate liquid cooling plate connecting the first and second modules. This not only improves space utilization efficiency but also enhances the thermal insulation performance of the individual liquid cooling plates through the intermediate liquid cooling plate, thereby reducing customer usage costs and battery pack manufacturing costs.

[0012] 2. In this utility model, the battery pack housing and bottom tray, as well as the upper and lower housings, are all connected by bolts, eliminating the battery system frame and reducing the overall weight. The gapless design between each battery pack layer saves space in the height of the battery system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the bottom tray of this utility model; Figure 2 This is a schematic diagram of the battery module of this utility model; Figure 3 This is a schematic diagram of the structure of the intermediate liquid cooling plate of this utility model; Figure 4 This is a schematic diagram of the structure of the box body of this utility model; Figure 5 This is a schematic diagram of the battery pack structure of this utility model; In the picture: 1. Base tray; 11. Tray frame; 12. Tray cold plate; 2. Battery module; 21. First module; 22. Second module; 3. Intermediate liquid cooling plate; 31. Liquid cooling base plate; 32. First heat spreader; 33. Second heat spreader; 4. Module end plate; 41. First module end plate; 42. Second module end plate; 5. Housing; 51. Housing frame; 52. Housing liquid cooling plate; 53. Housing maintenance window; 6. Maintenance cover. Detailed Implementation

[0014] To facilitate understanding of this utility model, 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, and 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.

[0015] The present invention will now be described in detail. In the following paragraphs, different aspects of the embodiments are defined in more detail. These aspects may be combined with any other aspect or multiple aspects unless explicitly stated otherwise. In particular, any feature considered preferred or advantageous may be combined with one or more other features considered preferred or advantageous.

[0016] In the description of this utility model, it should be understood that the terms "inner", "outer", "upper", "lower", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. Example

[0017] refer to Figure 1-2 As shown, this embodiment discloses a battery pack, including a bottom tray 1 and a housing 5. The housing 5 has a downward-opening receiving groove. The housing 5 is connected to the tray 1 and surrounds it to form a receiving cavity. A battery module 2 is provided in the receiving cavity. At least one end of the battery module 2 in the horizontal direction is provided with a busbar structure. The busbar structure is located above the top of the bottom tray 1. The battery module 2 includes a first module 21 and a second module 22 stacked together, and an intermediate liquid cooling plate 3 is connected between the first module 21 and the second module 22.

[0018] Existing technologies all employ a single-layer module structure, which has significant shortcomings in terms of system integration and space utilization efficiency. In contrast, the battery pack of this embodiment incorporates a double-layer battery module 2 within a single housing cavity, with an intermediate liquid cooling plate 3 connecting the first module 21 and the second module 22. Both the first module 21 and the second module 22 can transfer heat to the intermediate liquid cooling plate 3, which then dissipates the heat to the external environment. This structure not only improves space utilization efficiency but also enhances the insulation performance of the individual liquid cooling plate through the intermediate liquid cooling plate 3, reducing customer operating costs and battery pack manufacturing costs.

[0019] The bottom pallet 1 includes a pallet frame 11 and a pallet cold plate 12 that are fixedly connected to each other. The first module 21 is connected to the pallet cold plate 12, and the first module 21 has first module end plates 41 at both ends for mechanical constraint. The first module end plates 41 are fixedly connected to the pallet frame 11.

[0020] Specifically, the pallet frame 11 and the pallet cold plate 12 are connected together by welding. The first module end plate 41 is arranged vertically and perpendicular to the axis of the pallet frame 11. The bottom ends of the first module end plate 41 are fixed to the pallet frame 11 by welding. The two ends of the first module 21 are fixed by the first module end plate 41, and the bottom of the first module 21 is bonded to the pallet cold plate 12 by thermally conductive structural adhesive. The intermediate liquid cooling plate 3 is bonded to the upper side of the first module 21 by thermally conductive structural adhesive.

[0021] Additionally, refer to Figure 3 As shown, the second module 22 has second module end plates 42 at both ends for mechanical constraint. The second module end plates 42 are fixedly connected to the intermediate liquid cooling plate 3 and the first module end plate 41. Specifically, the first module 21 has a first mounting hole at the top, the second module 22 has a second mounting hole corresponding to the first mounting hole at the bottom, and the intermediate liquid cooling plate 3 has through holes corresponding to the first and second mounting holes. The second module 22 is connected to the intermediate liquid cooling plate 3 and the first module 21 together with bolts. The overall structure composed of the second module 22, the intermediate liquid cooling plate 3, and the first module 21 ensures the structural strength of the double-layer module to reduce module failure caused by bumps and collisions during vehicle operation. The second module 22 is fixed at both ends by the second module end plates 42, and the second module 22 is bonded to the intermediate liquid cooling plate 3 with thermally conductive adhesive. The thermally conductive structure not only improves the thermal conductivity between the first module 21, the second module 22, and the intermediate liquid cooling plate 3, but also... This improved the overall structural stability.

[0022] In addition, refer to Figure 3 As shown, the intermediate liquid cooling plate 3 includes a liquid cooling base plate 31, a first heat spreader 32, and a second heat spreader 33. The first heat spreader 32 and the second heat spreader 33 are respectively disposed on the upper and lower sides of the liquid cooling base plate 31. The first heat spreader 32 and the second heat spreader 33 are tightly attached to the upper and lower surfaces of the liquid cooling base plate 31, respectively. By having the upper and lower heat spreaders work simultaneously, the effective heat dissipation area is significantly increased, enabling simultaneous heat dissipation for the first module 21 and the second module 22, greatly improving the overall efficiency of heat transfer from the battery cell to the coolant.

[0023] The side of the enclosure frame 51 is equipped with a removable maintenance cover 6, which allows for simple electrical repairs without system disassembly. Example

[0024] refer to Figure 5 As shown, based on Embodiment 1, there are multiple housings 5, and these housings 5 ​​are stacked along the height direction. Two adjacent housings 5 ​​are joined together to form a receiving cavity, within which a battery module 2 is housed. The busbar structure of the battery module 2 is located above the top of the lower housing 5. In this embodiment, the specific number of housings 5 ​​can be selected according to actual needs. For example, there are three housings 5, with the bottom housing 5 and the middle housing 5 connected to the top of the battery module 2.

[0025] For details, please refer to Figure 4 As shown, the housing 5 includes a housing frame 51 and a housing liquid cooling plate 52, with the liquid cooling plate 52 integrated onto the housing frame 51. The liquid cooling plates 52 of the bottom housing 5 and the middle housing 5 are connected to the first module 21 on their upper sides, and the first module 21 has first module end plates 41 at both ends for mechanical constraint, which are fixedly connected to the housing 5. The housing frame 51 and the housing liquid cooling plate 52 are connected together by welding. The first module end plates 41 are arranged vertically and perpendicular to the axis of the housing frame 51, and the bottom ends of the first module end plates 41 are fixed to the housing frame 51 by welding. The two ends of the first module 21 are fixed by the first module end plates 41, and the bottom of the first module 21 is bonded to the housing liquid cooling plate 52 with thermally conductive structural adhesive. The housing liquid cooling plate 52 is bonded to the upper side of the first module 21 with thermally conductive structural adhesive.

[0026] The bottom of the housing 5 is fixedly connected to the bottom tray 1 by bolts around its perimeter. The bottom of the upper housing 5 is also fixedly connected to the lower housing 5 by bolts around its perimeter. The housing 5 and the bottom tray 1, as well as the upper and lower housing 5, are all connected by bolts, eliminating the need for a battery system frame and reducing overall weight. The gapless design between each battery pack layer saves space in the height of the battery system. After the multiple housings 5 ​​are stacked into a system, all electrical wiring harnesses are integrated inside the pack for connection, saving space in the length direction and reducing the risk of electric shock to personnel later.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A battery pack, characterized by, Includes a bottom tray (1) and a housing (5). The housing (5) has a downward-opening receiving groove. The housing (5) is connected to the tray (1) and surrounds it to form a receiving cavity. A battery module (2) is provided in the receiving cavity. At least one end of the battery module (2) in the horizontal direction is provided with a busbar structure. The busbar structure is located above the top of the bottom tray (1). The battery module (2) includes at least a first module (21) and a second module (22) stacked together. An intermediate liquid cooling plate (3) is connected between the first module (21) and the second module (22).

2. The battery pack of claim 1, wherein, The bottom pallet (1) includes a pallet frame (11) and a pallet cold plate (12) that are fixedly connected to each other. The first module (21) is connected to the pallet cold plate (12), and the first module (21) has a first module end plate (41) at both ends for mechanical constraint. The first module end plate (41) is fixedly connected to the pallet frame (11).

3. The battery pack of claim 2, wherein, The second module (22) has a second module end plate (42) at both ends for mechanical constraint. The second module end plate (42) is fixedly connected to the intermediate liquid cooling plate (3) and the first module end plate (41).

4. The battery pack of claim 1, wherein, The intermediate liquid cooling plate (3) includes a liquid cooling base plate (31), a first temperature distribution plate (32), and a second temperature distribution plate (33), with the first temperature distribution plate (32) and the second temperature distribution plate (33) respectively disposed on the upper and lower sides of the liquid cooling base plate (31).

5. The battery pack according to claim 1, characterized in that, The number of the boxes (5) is multiple, and the multiple boxes (5) are stacked along the height direction. Two adjacent boxes (5) are enclosed together to form a receiving cavity. The busbar structure of the battery module (2) is located above the top of the lower box (5).

6. The battery pack according to claim 5, characterized in that, The enclosure (5) includes an enclosure frame (51) and an enclosure liquid cooling plate (52). The enclosure liquid cooling plate (52) is integrated on the enclosure frame (51) and connected to the first module (21) on its upper side. The first module (21) has first module end plates (41) at both ends for mechanical constraint. The first module end plates (41) are fixedly connected to the enclosure (5).

7. The battery pack according to claim 5, characterized in that, The bottom of the box (5) is fixedly connected to the tray (1) by bolts around its perimeter, and the bottom of the upper box (5) is fixedly connected to the lower box (5) by bolts around its perimeter.

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