Battery pack lower shell and battery pack with same

Abstract

The utility model provides a lower shell of a battery pack and the battery pack with the lower shell. The lower shell of the battery pack comprises a cold plate, a lining plate and a reinforcing beam, the cold plate is provided with a plate body and a flow channel formed in the plate body in a stamping mode, and the flow channel is communicated with a liquid inlet pipe and a liquid outlet pipe. The lining plate covers the plate body from the upper part of the cold plate so as to seal the flow channel; turned edges which protrude upwards and then are turned outwards are formed at the edges of the periphery of the lining plate; the two reinforcing beams are arranged at an interval in the width direction of the lining plate; the two reinforcing beams are fixed to the inner sides of the two opposite turned-over edges respectively, and each reinforcing beam has the height extending upwards from the upper surface of the lining plate, so that a space for containing a module is formed between the reinforcing beams. The lower shell structure of the battery pack is simplified, the number of parts of the battery pack is reduced, the cost and the weight of the battery pack are reduced while rapid cooling of the battery pack is ensured, and the use quality of a vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack lower shell and a battery pack having the same. Background Art

[0002] With the rise of revolutionary changes in the contemporary automobile industry, major automobile manufacturers have shifted their focus to new energy vehicles. Pure electric vehicles, as new energy vehicles, are increasingly favored by all sectors of society. In new energy electric vehicles, the battery pack is a key component that determines the endurance and safety of electric vehicles, and is a key constraint for electric vehicles to gain market recognition and customer trust.

[0003] The battery pack mainly includes a battery pack lower shell and a battery pack upper shell, as well as a battery module, a high-voltage electrical system and a thermal management system located between the battery pack lower shell and the battery pack upper shell; the battery pack lower shell, as one of the core components of the battery pack, mainly plays the role of protecting the battery module, high-voltage electrical system and thermal management system.

[0004] In the related art, there are two ways to cool the battery pack: air cooling and water cooling. When the temperature of the power battery is high, the air cooling system can use the cold air generated by the air conditioner in the passenger compartment to cool the battery pack, but the cooling speed is slow; the water cooling system uses liquids such as water and refrigerant, and arranges pipelines between battery modules or around battery modules, and connects the cooler to the pipeline, and uses the heat exchange between the liquid and the wall of the battery module to achieve rapid cooling of the battery pack. However, the battery pack configured in this way has a large number of parts and a complex structure, and the cost and weight of the battery pack are high, which affects the quality of vehicle use. Utility Model Content

[0005] In view of this, the utility model aims to propose a battery pack lower shell, which simplifies the battery pack lower shell structure and reduces the number of battery pack components, thereby ensuring rapid cooling of the battery pack and reducing the cost and weight of the battery pack to improve the quality of vehicle use.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A battery pack lower shell comprises: a cold plate, the cold plate having a plate body, and a flow channel formed by stamping on the plate body, the flow channel being connected with a liquid inlet pipe and a liquid outlet pipe;

[0008] A lining plate is sealed on the plate body to seal the flow channel; the edges of the lining plate are punched to form flanges that protrude upward and then turn outward;

[0009] The reinforcing beams are arranged in two intervals along the width direction of the lining plate; the two reinforcing beams are respectively fitted and fixed on the inner sides of the two opposite flanges, and each reinforcing beam has a height extending upward from the upper surface of the lining plate to form a space for accommodating the module between the two symmetrically arranged reinforcing beams.

[0010] Furthermore, the reinforcing beam adopts an "L"-shaped profile; the bottom surface of the horizontal plate constituting the reinforcing beam is bonded to the upper surface of the lining plate, and one side surface of the horizontal plate is bonded and welded to the inner side surface of the flange.

[0011] Furthermore, in the area covered by the horizontal plate, there are flow drill screws which penetrate from the plate body upwards and connect the lining plate and the horizontal plate.

[0012] Furthermore, the plate body and the lining plate are fixedly connected by brazing.

[0013] Furthermore, a rivet nut facing the plate body is provided on the lining plate, and a through hole exposing the rivet nut is provided on the plate body.

[0014] Furthermore, the liquid inlet pipe and the liquid outlet pipe are fixedly retained on the lining plate.

[0015] Furthermore, the flanged section is arranged at one of the width edges of the lining plate, and a mounting plate extending upward is stamped at the flanged section, and the liquid inlet pipe and the liquid outlet pipe respectively penetrate the mounting plate and the lining plate in sequence from the outside of the mounting plate to connect the flow channel.

[0016] Furthermore, a hanging beam is fixedly connected to the outer side of the flange where each reinforcing beam is located.

[0017] Furthermore, the hanging beam is constructed as a profile structure bonded and welded to the outer side of the flange.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The lower shell of the battery pack described in the utility model realizes the injection of coolant into the flow channel from the liquid inlet pipe and discharge from the liquid outlet pipe by providing a cold plate with a flow channel stamped thereon and a lining plate sealed on the cold plate for sealing the flow channel, as well as a liquid inlet pipe and a liquid outlet pipe connected to the lining plate, thereby completing the circulation of coolant in the flow channel, making the modules and electrical components in the battery pack contact with the lining plate, and ensuring the cooling of the modules and electrical components in the battery pack.

[0020] The split cold plate and liner are combined with the reinforcing beam to form a battery pack lower shell with a cooling function. Compared with the existing battery pack lower shell, there is no need to set cooling components in the battery pack to cool the internal modules and electrical components, thereby simplifying the battery pack lower shell structure and reducing the parts required for the battery pack. At the same time, the cost and weight of the battery pack are reduced, thereby improving the quality of vehicle use.

[0021] Secondly, the horizontal plate bonded and welded to the upper surface of the lining plate improves the impact resistance and bending resistance of the reinforcing beam; at the same time, the horizontal plate is arranged to increase the connection surface between the reinforcing beam and the lining plate, strengthen the connection strength between the reinforcing beam and the lining plate, ensure the stability of the space for accommodating the module formed by the two reinforcing beams and the lining plate, and improve the strength of the lower shell of the battery pack.

[0022] The flow drill screws that penetrate the lining plate and the horizontal plate in sequence upward from the plate body realize auxiliary reinforcement of the connection between the lining plate and the horizontal plate, improve the connection strength of the lining plate and the reinforcement beam, and improve the impact resistance of the lower shell.

[0023] In addition, the plate body and the liner are fixedly connected by brazing, making the welding point between the two smoother and more beautiful. At the same time, brazing prevents the plate body and the liner from melting, only the brazing material melts, thereby making the welding more precise and improving the sealing of the flow channel.

[0024] The setting of the rivet nut provides installation points for the vehicle and the battery pack guard plate; it facilitates the installation of the lower shell of the battery pack while ensuring the sealing of the flow channel.

[0025] The mounting plate integrally formed with the flanging stamping has better stability. After the liquid inlet pipe and the liquid outlet pipe penetrate the mounting plate and are fixed to the mounting plate, the liquid inlet pipe and the liquid outlet pipe will not be misaligned with the flow channel due to force, thereby ensuring the sealing of the flow channel and the liquid inlet pipe and the liquid outlet pipe.

[0026] The profile structure of the hanging beam facilitates the installation of the lower shell of the battery pack and can effectively protect the liner from external impact and vibration, providing higher stability.

[0027] The utility model also provides a battery pack, comprising the battery pack lower shell as described above.

[0028] The battery pack of the utility model simplifies the structure of the battery pack and reduces the number of battery pack components by assembling the battery pack lower shell as set above. While ensuring rapid cooling of the battery pack, it reduces the cost and weight of the battery pack, thereby improving the quality of vehicle use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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:

[0030] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the utility model;

[0031] Figure 2 The first embodiment of the present utility model is a schematic diagram showing a cold plate;

[0032] Figure 3 This is an exploded view of the overall structure of the first embodiment of the utility model;

[0033] Figure 4 The first embodiment of the utility model is a cross-sectional view showing a flow drill screw;

[0034] Figure 5 This is the first embodiment of the utility model Figure 2 A partial enlarged schematic diagram of part A.

[0035] Description of the accompanying drawings: 1. cold plate;

[0036] 101, plate body; 1011, flow channel; 1012, via hole;

[0037] 2. Lining board;

[0038] 201, flange; 202, mounting plate;

[0039] 3. Strengthen the beam;

[0040] 301, horizontal plate; 302, vertical plate;

[0041] 4. Flow drill screws;

[0042] 5. Pull rivet nut;

[0043] 6. Hanging beam;

[0044] 601, hanging hole;

[0045] 7. Liquid inlet pipe;

[0046] 8. Liquid outlet pipe. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

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

[0051] Embodiment 1

[0052] The present embodiment relates to a battery pack lower shell, which simplifies the battery pack lower shell structure and reduces the number of battery pack components. While ensuring rapid cooling of the battery pack, it reduces the cost and weight of the battery pack to improve the quality of vehicle use.

[0053] In terms of overall structure, the lower shell of the battery pack includes a cold plate 1, which has a plate body 101 and a flow channel 1011 formed by stamping on the plate body 101, and the flow channel 1011 is connected to a liquid inlet pipe 7 and a liquid outlet pipe 8;

[0054] The liner 2 is sealed on the plate body 101 from above the cold plate 1 to seal the flow channel 1011; the edges of the upper surface of the liner 2 are punched to form flanges 201 that protrude upward and then turn outward;

[0055] The reinforcing beams 3 are arranged as two spaced apart along the width direction of the lining plate 2; the two reinforcing beams 3 are respectively fitted and fixed on the inner sides of two opposite flanges 201, and each reinforcing beam 3 has a height extending upward from the upper surface of the lining plate 2, so as to form a space for accommodating the module between the two symmetrically arranged reinforcing beams 3.

[0056] As described above, the lower shell of the battery pack in this embodiment is provided with a cold plate 1 stamped with a flow channel 1011, a liner 2 sealed on the cold plate 1 for sealing the flow channel 1011, and a liquid inlet pipe 7 and a liquid outlet pipe 8 connected to the liner 2. The coolant is injected into the flow channel 1011 from the liquid inlet pipe 7 and discharged from the liquid outlet pipe 8, so that the coolant circulates in the flow channel 1011, so that the modules and electrical components in the battery pack are in contact with the liner 2, ensuring that the modules and electrical components in the battery pack are cooled.

[0057] The split cold plate 1 and lining plate 2 are combined with the reinforcing beam 3 to form a battery pack lower shell with a cooling function. Compared with the existing battery pack lower shell, there is no need to set cooling components in the battery pack to cool the internal modules and electrical components, thereby simplifying the battery pack lower shell structure and reducing the parts required for the battery pack. At the same time, the cost and weight of the battery pack are reduced, thereby improving the quality of vehicle use.

[0058] Based on the above overall introduction, refer to Figures 1 to 5 The cold plate 1 and the flow channel 1011 stamped on the plate body 101 are formed by stamping an aluminum plate. In this embodiment, an aluminum material formed by a composite of 6-series aluminum and 3-series aluminum is selected; compared with cutting the flow channel 1011 on the plate, stamping can form the flow channel 1011 without increasing the overall thickness of the cold plate 1, and the flow channel 1011 and the cold plate 1 are integrally formed without the risk of leakage. The cold plate 1 is made of aluminum plate as raw material, and aluminum has the advantages of both thermal conductivity and light weight; as an alternative embodiment, other materials can be selected to stamp the cold plate 1, such as copper, which is heavier than aluminum.

[0059] In order to make the plate body 101 and the liner 2 more precisely fixed; the plate body 101 and the liner 2 are fixedly connected by brazing, and the liner 2 is also made of aluminum material formed by a composite of 6-series aluminum and 3-series aluminum; brazing makes the welding point between the two smoother and more beautiful, and at the same time, brazing will not melt the plate body 101 and the liner 2, but only the brazing material will melt, thereby making the welding more precise and improving the sealing of the flow channel 1011. Before brazing, the contact surface of the plate body 101 and the liner 2 is cleaned to remove the oil film and oxide film that may exist on the plate body 101 and the liner 2, and the brazing material is placed between the plate body 101 and the liner 2. When the plate body 101, the liner 2 and the brazing material are heated together to a temperature slightly higher than the melting temperature of the brazing material, the brazing material melts and infiltrates between the contact surface of the plate body 101 and the liner 2. The liquid solder spreads between the plate body 101 and the lining plate 2 by means of capillary action, so that the lining plate 2, the plate body 101 and the solder dissolve and penetrate each other to form an alloy layer, and the brazing is completed after the solder condenses.

[0060] Based on the purpose of symmetrically arranging the two reinforcing beams 3 and connecting them to the lining plate 2 to form a space for accommodating the module, in order to improve the connection strength between the reinforcing beams 3 and the lining plate 2; Figures 1 to 4The reinforcing beam 3 is an L-shaped profile; the bottom surface of the horizontal plate 301 constituting the reinforcing beam 3 is bonded to the upper surface of the lining plate 2, and one side surface of the horizontal plate 301 is bonded and welded to the inner side surface of the flange 201. The vertical plate 302 constituting the reinforcing beam 3 is integrally formed on the upper surface of the horizontal plate 301 away from the lining plate 2. The two vertical plates 302 are located on the side where the two reinforcing beams 3 are close to each other, and the space between the two vertical plates 302 constitutes a space for accommodating the module.

[0061] The horizontal plate 301 bonded and welded to the upper surface of the lining plate 2 improves the impact resistance and bending resistance of the reinforcing beam 3; at the same time, the horizontal plate 301 is provided to improve the connection surface between the reinforcing beam 3 and the lining plate 2, strengthen the connection strength between the reinforcing beam 3 and the lining plate 2, ensure the stability of the space for accommodating the module formed by the two reinforcing beams and the lining plate 2, and improve the strength of the lower shell of the battery pack. The bottom surface of the reinforcing beam 3 and the lining plate 2 are coated with glue to achieve the adhesion of the reinforcing beam 3 and the lining plate 2, which helps to achieve the pre-fixation of the reinforcing beam 3 and the lining plate 2 before brazing, and the enhanced fixation of the two after brazing.

[0062] In order to increase the integrity of the cold plate 1, the lining plate 2 and the reinforcing beam 3; Figure 4 , located in the area covered by the horizontal plate 301, there are flow drill screws 4 that penetrate upward from the plate body 101 to connect the lining plate 2 and the horizontal plate 301. The flow drill screws 4 do not need to be pre-drilled with fixing holes, so the damage to the lining plate 2 and the horizontal plate 301 is small; because the flow drill screws 4 can strengthen the surface of the lining plate 2, the cold plate 1 and the horizontal plate 301 while also strengthening the inside, effectively preventing the generation of fatigue cracks; at the same time, they can achieve quick connection and improve production efficiency.

[0063] In order to improve the connection stability and sealing performance between the liquid inlet pipe 7 and the liquid outlet pipe 8 and the flow channel 1011; Figure 1 and Figure 2 , the liquid inlet pipe 7 and the liquid outlet pipe 8 are fixedly maintained on the lining plate 2; specifically, as an implementable method, a flange 201 section is arranged at the width edge of one lining plate 2, and an upwardly extending mounting plate 202 is stamped and formed at the flange 201 section, and the liquid inlet pipe 7 and the liquid outlet pipe 8 respectively penetrate the mounting plate 202 and the lining plate 2 in sequence from the outside of the mounting plate 202, and then connect the flow channel 1011.

[0064] The mounting plate 202 integrally formed by stamping with the flange 201 has better stability. After the liquid inlet pipe 7 and the liquid outlet pipe 8 pass through the mounting plate 202 and are fixed on the mounting plate 202, the liquid inlet pipe 7 and the liquid outlet pipe 8 have better integrity with the flange 201, so that the liquid inlet pipe 7 and the liquid outlet pipe 8 will not be misaligned with the flow channel 1011 due to force, thereby ensuring the sealing of the flow channel 1011 with the liquid inlet pipe 7 and the liquid outlet pipe 8.

[0065] In order to provide installation points for the vehicle and the battery pack guard plate; refer to Figure 2 and 5 , a rivet nut 5 facing the plate body 101 is provided on the lining plate 2, and a through hole 1012 exposing the rivet nut 5 is provided on the plate body 101. When the vehicle is assembled or the battery pack guard is installed, the rivet nut 5 can achieve a high-strength connection between the bolt and the rivet nut 5, has good mechanical properties and seismic resistance, and improves the quality and reliability of the battery pack lower shell after connection; secondly, the rivet nut 5 can achieve a high-sealing connection that is not easy to loosen, waterproof, and oil-proof, ensuring a close connection between parts to prevent leakage. Furthermore, the rivet nut 5 has a simple structure and is easy to use. Only customized tools are needed to easily complete the tightening operation, which effectively saves labor and time costs and improves production efficiency. Compared with welding, it has higher connection strength, and there is no need to worry about the material being fusible; compared with tapping internal threads, it has the characteristics of stable connection and no slipping.

[0066] In order to facilitate the connection between the lower shell of the battery pack and the whole vehicle; Figures 1 to 4 The outer side of the flange 201 where each reinforcing beam 3 is located is fixedly connected with a hanging beam 6. The battery pack is connected to the whole vehicle through the hanging beam 6. The hanging beam 6 is provided with a hanging hole 601, which is used for mounting and installing the whole vehicle components. The connection between the hanging beam 6 and the flange 201 is located below the flange 201, so that the flange 201 can be lifted after the hanging beam 6 is fixed to the whole vehicle.

[0067] Based on the purpose of connecting the hanging beam 6 with the flange 201, in order to improve the stability of the connection between the hanging beam 6 and the flange 201, the hanging beam 6 is constructed as a profile structure that is adhered and welded to the outside of the flange 201. By setting the hanging beam 6 as a profile structure, it has a hollow energy absorption structure and improves the structural strength of the hanging beam 6. The hanging beam 6 and the flange 201 are brazed, and brazing makes the welding point between the two smoother and more beautiful. At the same time, brazing will not melt the hanging beam 6 and the flange 201, but only the brazing material melts, thereby making the welding more precise. The hanging beam 6 and the flange 201 are bonded by coating glue, which helps to achieve the pre-fixation of the reinforcing beam 3 and the lining plate 2 before brazing, and the strengthening fixation of the two after brazing. Optionally, a strengthening nail is provided between the flange 201 and the hanging beam 6 to improve the connection stability between the flange 201 and the hanging beam 6.

[0068] When the lower shell of the battery pack of this embodiment is used, the cold plate 1 with the flow channel 1011 stamped thereon and the liner 2 sealed on the cold plate 1 for sealing the flow channel 1011 are bonded and welded, and then the liquid inlet pipe 7 and the liquid outlet pipe 8 are connected to the flow channel 1011 and fixed to the liner 2 after passing through the mounting plate 202. The coolant is injected into the flow channel 1011 from the liquid inlet pipe 7 and discharged from the liquid outlet pipe 8, so that the coolant circulates in the flow channel 1011, so that the modules and electrical components in the battery pack are in contact with the liner 2, ensuring that the modules and electrical components in the battery pack are cooled. The split cold plate 1 and the liner 2 are combined with the reinforcing beam 3 to form a lower shell of the battery pack with a cooling function; compared with the existing lower shell of the battery pack, there is no need to set a cooling component in the battery pack to cool the internal modules and electrical components, so as to simplify the structure of the lower shell of the battery pack and reduce the components required for the battery pack; at the same time, the cost and weight of the battery pack are reduced, so as to improve the quality of use of the vehicle.

[0069] Embodiment 2

[0070] This embodiment relates to a battery pack, including the battery pack lower shell as described above. The battery pack of this embodiment simplifies the structure of the battery pack and reduces the number of battery pack components by assembling the battery pack lower shell as described above, thereby ensuring rapid cooling of the battery pack and reducing the cost and weight of the battery pack, thereby improving the quality of vehicle use.

[0071] 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 lower shell, characterized in that: include: A cold plate, the cold plate comprising a plate body and a flow channel formed by stamping on the plate body, wherein the flow channel is connected with a liquid inlet pipe and a liquid outlet pipe; A lining plate is sealed on the plate body to seal the flow channel; the edges of the lining plate are punched to form flanges that protrude upward and then turn outward; The reinforcing beams are arranged in two intervals along the width direction of the lining plate; the two reinforcing beams are respectively fitted and fixed on the inner sides of the two opposite flanges, and each reinforcing beam has a height extending upward from the upper surface of the lining plate to form a space for accommodating the module between the two symmetrically arranged reinforcing beams.

2. The battery pack lower shell according to claim 1, characterized in that: The reinforcing beam is an "L"-shaped profile; the bottom surface of the horizontal plate constituting the reinforcing beam is bonded to the upper surface of the lining plate, and one side surface of the horizontal plate is bonded and welded to the inner side surface of the flange.

3. The battery pack lower shell according to claim 2, characterized in that: Located in the area covered by the horizontal plate, flow drill screws are provided which penetrate from the plate body upwards in sequence and connect the lining plate and the horizontal plate.

4. The battery pack lower shell according to claim 1, characterized in that: The plate body and the lining plate are fixedly connected by brazing.

5. The battery pack lower shell according to claim 1, characterized in that: The lining plate is provided with a rivet nut facing the plate body, and the plate body is provided with a through hole for exposing the rivet nut.

6. The battery pack lower shell according to claim 1, characterized in that: The liquid inlet pipe and the liquid outlet pipe are fixedly held on the lining plate.

7. The battery pack lower shell according to claim 6, characterized in that: The flanged section is arranged at the width edge of one of the lining plates, and a mounting plate extending upward is stamped at the flanged section. The liquid inlet pipe and the liquid outlet pipe respectively penetrate the mounting plate and the lining plate in sequence from the outside of the mounting plate to connect the flow channel.

8. The battery pack lower shell according to any one of claims 1 to 7, characterized in that: The outer side of the flange where each reinforcement beam is located is fixedly connected with a hanging beam.

9. The battery pack lower shell according to claim 8, characterized in that: The hanging beam is constructed as a profile structure bonded and welded to the outer side of the flange.

10. A battery pack, characterized in that: The battery pack is provided with a battery pack lower casing as claimed in any one of claims 1 to 9.

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