A power battery pack with an overhead liquid cooling plate

Abstract

The utility model provides a kind of power battery pack with top-mounted liquid cooling plate, including box body, battery module, box upper cover, battery module is placed in the inside of box body, beam is provided in the inside of box body, the top of battery module is provided with liquid cooling plate, liquid cooling plate avoids beam and forms multiple partition liquid cooling flow channel;Box upper cover, liquid cooling plate and beam are fixedly connected by fastener.It can ensure the safety and reliability of liquid cooling plate, reduce the structural deformation and damage caused by external force extrusion stress, realize the expected function of heat conduction.

Description

Technical Field

[0001] This utility model relates to the field of battery system design, and in particular to a power battery pack with a top-mounted liquid cooling plate. Background Technology

[0002] In existing technologies, due to the relatively large heat dissipation space at the bottom of the battery and the ease of arranging liquid cooling pipes, the liquid cooling plate in the battery system is usually placed at the bottom of the battery. However, with the increasing application scenarios of new energy vehicles, factors such as the battery pack's position in the vehicle can also affect its structural design. For example, the battery pack's installation position on the anti-collision beam in the vehicle may be on the same plane as the liquid cooling plate, leading to the risk of the liquid cooling plate being crushed and failing. In this case, additional protective measures need to be designed, including strengthening the battery pack frame, changing the distribution of liquid cooling channels and the box structure design within the battery pack, or adjusting the position of the liquid cooling plate to reduce the impact force inside the box. Among these, the main risks of adjusting the position of the liquid cooling plate from the bottom to the top of the battery module are: the risk of the liquid cooling plate being fixed in the Z direction and subjected to lateral force compression; and the possibility that the upper space between the battery pack cover and the liquid cooling plate may be compressed due to bumps and vibrations during vehicle operation, which may cause the liquid cooling plate to be stressed, resulting in damage to the flow channels and leakage. Utility Model Content

[0003] Based on the above, this utility model provides a power battery pack with a top-mounted liquid cooling plate, aiming to reduce technical problems such as structural deformation and damage caused by external force extrusion on the liquid cooling channel.

[0004] A power battery pack with a top-mounted liquid cooling plate includes a housing body, a battery module, and a housing cover. The battery module is placed inside the housing body, and a crossbeam is provided inside the housing body. A liquid cooling plate is provided above the battery module, and the liquid cooling plate avoids the crossbeam to form multiple partitioned liquid cooling channels. The top cover, liquid cooling plate, and crossbeams of the enclosure are fixedly connected by fasteners.

[0005] Furthermore, the box body has a long sidewall extending along the length direction and a short sidewall extending along the width direction, and the crossbeam extends along the width direction of the box body. The distribution of the partitioned liquid cooling channels corresponds to the area between the crossbeams, as well as the area between the short frame of the housing body and the nearest crossbeam. The liquid cooling plate includes a first liquid cooling main channel and a second liquid cooling main channel, and the second liquid cooling main channel is connected to liquid cooling branch channels that correspond one-to-one with the partitioned liquid cooling channels. One end of the partitioned liquid cooling channel is connected to the first liquid cooling main channel, and the other end of the partitioned liquid cooling channel is connected to the corresponding liquid cooling branch channel, which in turn connects to the second liquid cooling main channel.

[0006] Furthermore, a longitudinal beam extending along the length direction is provided in the middle of the box body, and the two ends of the longitudinal beam are respectively connected to the two short side frames of the box body; The longitudinal beams divide the interior of the box body into two sub-regions. Several crossbeams are arranged in parallel within each sub-region. The first end of the crossbeams is connected to the long edge of the box body, and the second end of the crossbeams is connected to the longitudinal beams. In each sub-region, the first liquid cooling main channel is close to the long frame side of the main body of the box, and each liquid cooling branch channel is close to the longitudinal beam side and extends along the length direction. The second liquid cooling main channel is located near the short frame of the cabinet body and extends along the width direction.

[0007] Furthermore, the second liquid cooling main channel in both sub-regions is close to the first short frame of the housing body. The second liquid cooling main channel in one sub-region has an inlet, and the second liquid cooling main channel in the other sub-region has an outlet. The first liquid cooling main channel of the two sub-regions is connected on one side of the second short frame near the main body of the enclosure.

[0008] Furthermore, each zone's liquid cooling channel includes several straight channels parallel to the crossbeam; The partitioned liquid cooling channel has multiple straight channel groups, and the straight channels in each straight channel group are connected to each other at a first end and also connected to each other at a second end. The straight flow channel group located in the middle region of the partitioned liquid cooling flow channel is connected to a straight flow channel group adjacent to the first side at the first end, and is connected to a straight flow channel group adjacent to the second side at the second end.

[0009] Furthermore, in each sub-region, the length of the straight flow channel of the partitioned liquid cooling flow channel near the first short frame of the housing body is shorter than the length of the straight flow channel of the partitioned liquid cooling flow channel away from the first short frame of the housing body.

[0010] Furthermore, the partitioned liquid cooling channels in the two sub-regions are symmetrically arranged along the longitudinal beams.

[0011] Furthermore, the fastener is a rivet bolt; Some crossbeams and liquid cooling plates have fixing holes at corresponding positions for rivet bolts to pass through.

[0012] Furthermore, foam is filled between the upper end of the liquid cooling plate and the top cover of the housing.

[0013] Furthermore, the lower end of the liquid cooling plate is coated with thermally conductive adhesive.

[0014] The beneficial technical effects of this utility model are as follows: the liquid cooling plate, the top cover of the box, and the crossbeam of the box are fixedly connected by the same fastener, and the liquid cooling flow channel is partitioned to avoid the crossbeam, which ensures the safety and reliability of the liquid cooling plate, reduces structural deformation and damage caused by external pressure, and achieves the expected function of heat conduction and heat transfer. Attached Figure Description

[0015] Figure 1 This is an isometric view of the external structure of a power battery pack with a top-mounted liquid cooling plate according to this utility model. Figure 2 This is a front view of a power battery pack with a top-mounted liquid cooling plate according to the present invention. Figure 3 This is a bottom view of a power battery pack with a top-mounted liquid cooling plate according to the present invention. Figure 4 This is a side view of a power battery pack with a top-mounted liquid cooling plate according to the present invention. Figure 5 This is a top view of the inside of a power battery pack with a top-mounted liquid cooling plate (with the cover removed). Figure 6 This is an isometric view of the interior of a power battery pack with a top-mounted liquid cooling plate (with the cover removed). in: 1-Top cover of the box; 2a-Second short frame; 2b-First short frame.

[0016] 2-Box body; 3-Fasteners; 4-Liquid inlet; 5-Liquid outlet; 6-Liquid cooling plate; 7-Crossbeam; 8-Longitudinal beam. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0020] See Figure 1 , Figures 5-6 This utility model provides a power battery pack with a top-mounted liquid cooling plate, including a housing body 2, a battery module, and a housing cover 1. The battery module is placed inside the housing body 2. A crossbeam 7 is provided inside the housing body 2. A liquid cooling plate 6 is provided above the battery module. The liquid cooling plate 6 avoids the crossbeam 7 to form multiple partitioned liquid cooling channels. The top cover 1, liquid cooling plate 6, and crossbeam 7 of the enclosure are fixedly connected by fasteners 3.

[0021] When the liquid cooling plate is placed on top of the battery module, an integrated structural design is adopted. The liquid cooling plate, the top cover of the housing, the crossbeam, etc. are fixedly connected by the same fastener to ensure the safety and reliability of the liquid cooling plate, reduce structural deformation and damage caused by external pressure, and achieve the expected function of heat conduction and heat transfer.

[0022] Furthermore, the box body 2 has a long sidewall extending along the length direction and a short sidewall extending along the width direction, and the crossbeam 7 extends along the width direction of the box body 2. The distribution of the partitioned liquid cooling channels corresponds to the area between the crossbeams 7 and 7, as well as the area between the short frame of the box body 2 and the nearest crossbeam 7. The liquid cooling plate 6 includes a first liquid cooling main channel and a second liquid cooling main channel, and the second liquid cooling main channel is connected to liquid cooling branch channels that correspond one-to-one with the partitioned liquid cooling channels. One end of the partitioned liquid cooling channel is connected to the first liquid cooling main channel, and the other end of the partitioned liquid cooling channel is connected to the corresponding liquid cooling branch channel, which in turn connects to the second liquid cooling main channel.

[0023] The battery pack housing is used to support the battery modules and liquid cooling plates, etc. Several battery modules are distributed inside the housing, and liquid cooling plates are arranged above the battery modules. The battery modules are placed between the crossbeams.

[0024] Furthermore, a longitudinal beam 8 extending along the length direction is provided in the middle of the box body 2, and the two ends of the longitudinal beam are respectively connected to the two short side frames of the box body. The longitudinal beam 8 divides the internal area of ​​the box body 2 into two sub-areas. Several crossbeams 7 are arranged in parallel within each sub-area. The first end of the crossbeam 7 is connected to the long side frame of the box body 2, and the second end of the crossbeam 7 is connected to the longitudinal beam 8. In each sub-region, the first liquid cooling main channel is close to the long side of the housing body 2, and each liquid cooling branch channel is close to the side of the longitudinal beam 8 and extends along the length direction. The second liquid cooling main channel is located near the short side of the cabinet body 2 and extends along the width direction.

[0025] On the one hand, the longitudinal beam 8 helps to improve the strength and rigidity of the box body. On the other hand, the longitudinal beam 8 forms a longitudinal cavity that extends along the length direction, which can accommodate the BMS management system connected to the battery module.

[0026] The crossbeams are used to enhance the strength and rigidity of the battery pack housing. The housing and crossbeams resist external impacts and pressures, reducing the stress and deformation of the battery modules and liquid cooling plates.

[0027] In addition, the liquid cooling channels of the liquid cooling plate are distributed to avoid the position of the crossbeam inside the box, and are divided into several partitioned liquid cooling channels. Each partitioned liquid cooling channel is connected by a main channel distributed near the edge of the long frame. The temperature of the liquid cooling plate can be controlled by adjusting parameters such as the flow rate of the liquid inlet, thereby realizing the temperature regulation of the battery pack system.

[0028] Furthermore, the second liquid cooling main channel in both sub-regions is close to the first short frame 2b of the main body of the enclosure. The second liquid cooling main channel in one sub-region has an inlet 4, and the second liquid cooling main channel in the other sub-region has an outlet 5. The first liquid cooling main channel of the two sub-regions is connected on the side of the second short frame 2a near the main body of the enclosure 2.

[0029] The liquid inlet and outlet of the battery pack liquid cooling plate are located on the same short frame near the main body of the box. The NTC temperature sensors distributed in the battery pack can collect the temperature distribution data of each battery module / cell. After analysis and calculation by the battery management system (BMS), the temperature difference of each area is determined, thereby adjusting the flow rate of the liquid inlet and outlet pipes, so as to achieve uniform temperature control of battery modules in different distribution positions.

[0030] Furthermore, each zone's liquid cooling channel includes several straight channels parallel to the crossbeam 7; The partitioned liquid cooling channel has multiple straight channel groups, and the straight channels in each straight channel group are connected to each other at the first end and also connected to each other at the second end. The straight flow channel group in the middle region of the partitioned liquid cooling flow channel is connected to a straight flow channel group adjacent to the first side at the first end, and is connected to a straight flow channel group adjacent to the second side at the second end.

[0031] Specifically, the straight flow channel group includes two straight flow channels.

[0032] Furthermore, in each sub-region, the length of the straight flow channel in the partitioned liquid cooling channel near the first short frame 2b of the housing body 2 is shorter than the length of the straight flow channel in the partitioned liquid cooling channel away from the first short frame 2b of the housing body 2. The lengths of all straight flow channels in the partitioned liquid cooling channel are the same.

[0033] The liquid cooling plate is placed on top of the battery module. Since the heat of the battery cells inside the housing will accumulate in the top space during operation, the liquid cooling plate can fully exert its heat dissipation effect when placed on top. In addition, the liquid cooling channel partition design can focus on the heat concentration area. Based on the high temperature area collected by the BMS and the battery module temperature sensor, the flow rate of the inlet and outlet pipes can be adjusted to achieve targeted adjustment.

[0034] Furthermore, the partitioned liquid cooling channels in the two sub-regions are symmetrically arranged along the longitudinal beam 8.

[0035] Furthermore, fastener 3 is a rivet bolt; Some of the crossbeams 7 and liquid cooling plates 6 have corresponding fixing holes for rivet bolts to pass through.

[0036] Fastener 3 is a sealing rivet bolt. A fixing hole is opened in the middle of the liquid cooling plate 6, and a fixing hole is opened on the crossbeam 7, allowing the sealing rivet bolt to pass through for fixed connection. The sealing rivet bolt sequentially passes through the battery pack's top cover 1, the liquid cooling plate 6, and the crossbeam 7 inside the box body 2 to achieve integrated fixed connection, reducing the amplitude of vibration when the battery pack is in vehicle mode and improving the overall rigidity of the liquid cooling plate and battery pack. The overall appearance structure is as follows: Figure 1 As shown, the overall front view is as follows. Figure 2 As shown. Furthermore, as... Figure 3 As shown, there are also perforations at the bottom of the housing body, allowing the sealing rivet bolts to connect the housing cover 1, liquid cooling plate 6, crossbeam 7, and the bottom of the housing body 2 into a single unit. This enables the battery pack to be connected to the vehicle's mounting points when necessary, increasing the rigidity and strength of the battery pack system and providing mechanical support for the liquid cooling plate. Figure 4 As shown, lifting points are provided on the two short sides of the main body of the box.

[0037] The method of positioning by the rivet bolts on the crossbeam 7 inside the housing body 2 can also be used for marking the position of the liquid cooling channel in different zones. As part of the foolproof measures, the position of the opening of the crossbeam should be determined according to the size of the liquid cooling plate and should be as close as possible to the center of gravity of the liquid cooling plate.

[0038] In addition, a certain gap is maintained between the two sides of the battery module and the crossbeams 7 arranged inside the box body 2. The first end of the crossbeam 7 is welded to the long frame of the box body 2 as a whole, so that the battery pack has a high bending cross section and torsional stiffness, which can reduce the impact of external extrusion on the battery module and improve the strength of the box.

[0039] Furthermore, foam is filled between the upper end of the liquid cooling plate 6 and the top cover of the housing.

[0040] The foam is flame-retardant. The thickness of the foam is determined based on the distance between the liquid cooling plate and the top cover of the battery pack. It should maintain a certain amount of compression to improve the dynamic rigidity of the entire battery pack housing while reducing the risk of excessive vibration of the top cover due to harsh operating conditions, and reducing damage to the liquid cooling plate caused by stress.

[0041] Furthermore, the lower end of the liquid cooling plate 6 is coated with thermally conductive adhesive.

[0042] Thermally conductive adhesive is applied to the lower end of the liquid cooling plate 6 to facilitate the removal of heat generated by the battery module.

[0043] The liquid cooling plate 6 is also secured to the battery cover in the battery module using thermally conductive adhesive. The thermally conductive adhesive also facilitates later disassembly and maintenance.

[0044] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power battery pack with a top-mounted liquid cooling plate, comprising a housing body, a battery module, and a housing cover, wherein the battery module is placed inside the housing body, and a crossbeam is provided inside the housing body, characterized in that, A liquid cooling plate is provided above the battery module, and the liquid cooling plate forms multiple partitioned liquid cooling channels, avoiding the crossbeam. The top cover of the enclosure, the liquid cooling plate, and the crossbeam are fixedly connected by fasteners.

2. A power battery pack with a top-mounted liquid cooling plate as described in claim 1, characterized in that, The box body has a long sidewall extending along the length direction and a short sidewall extending along the width direction, and the crossbeam extends along the width direction of the box body. The distribution of the partitioned liquid cooling channels corresponds to the area between the crossbeams and the area between the short frame of the housing body and the nearest crossbeam. The liquid cooling plate includes a first liquid cooling main channel and a second liquid cooling main channel, and the second liquid cooling main channel is connected to liquid cooling branch channels that correspond one-to-one with the partitioned liquid cooling channels. One end of the partitioned liquid cooling channel is connected to the first liquid cooling main channel, and the other end of the partitioned liquid cooling channel is connected to the corresponding liquid cooling branch channel, which in turn connects to the second liquid cooling main channel.

3. A power battery pack with a top-mounted liquid cooling plate as described in claim 2, characterized in that, The box body is provided with a longitudinal beam extending along the length direction in the middle position, and the two ends of the longitudinal beam are respectively connected to the two short side frames of the box body; The longitudinal beam divides the interior area of ​​the box body into two sub-areas. Several transverse beams are arranged in parallel within each sub-area. The first end of the transverse beam is connected to the long frame of the box body, and the second end of the transverse beam is connected to the longitudinal beam. In each of the sub-regions, the first liquid cooling main channel is close to the long frame side of the housing body, and each of the liquid cooling branch channels is close to the longitudinal beam side and extends along the length direction; The second liquid cooling main channel is located near the short frame side of the housing body and extends along the width direction.

4. A power battery pack with a top-mounted liquid cooling plate as described in claim 3, characterized in that, The second liquid cooling main channel in both sub-regions is close to the first short frame of the housing body. The second liquid cooling main channel in one sub-region has a liquid inlet, and the second liquid cooling main channel in the other sub-region has a liquid outlet. The first liquid cooling main channel of the two sub-regions is connected on one side of the second short frame near the main body of the enclosure.

5. A power battery pack with a top-mounted liquid cooling plate as described in claim 4, characterized in that, Each of the partitioned liquid cooling channels includes several straight channels parallel to the crossbeam; The partitioned liquid cooling channel has multiple straight channel groups, and the straight channels in each straight channel group are connected to each other at the first end and also connected to each other at the second end. The straight channel group located in the middle region of the partitioned liquid cooling channel is connected to a straight channel group adjacent to the first side at the first end, and is connected to a straight channel group adjacent to the second side at the second end.

6. A power battery pack with a top-mounted liquid cooling plate as described in claim 5, characterized in that, In each of the sub-regions, the length of the straight flow channel of the partitioned liquid cooling flow channel near the first short frame of the housing body is shorter than the length of the straight flow channel of the partitioned liquid cooling flow channel away from the first short frame of the housing body.

7. A power battery pack with a top-mounted liquid cooling plate as described in claim 4, characterized in that, The partitioned liquid cooling channels in the two sub-regions are symmetrically arranged along the longitudinal beam.

8. A power battery pack with a top-mounted liquid cooling plate as described in claim 2, characterized in that, The fastener is a rivet bolt; Fixing holes are provided at corresponding positions on the crossbeam and the liquid cooling plate for the rivet bolts to pass through.

9. A power battery pack with a top-mounted liquid cooling plate as described in claim 1, characterized in that, Foam is filled between the upper end of the liquid cooling plate and the top cover of the box.

10. A power battery pack with a top-mounted liquid cooling plate as described in claim 1, characterized in that, The lower end of the liquid cooling plate is coated with thermally conductive adhesive.

Images