TWI758528B - Battery pack case and battery pack with heat exchange function - Google Patents

Abstract

The invention relates to a battery pack case and a battery pack with heat exchange function, belonging to the technical field of batteries. The battery pack case disclosed in the present invention includes a heat exchange base plate and a plurality of side plates fixed on the heat exchange base plate, wherein the heat exchange base plate and the plurality of side plates basically surround and form a space for accommodating and fixing one or more battery modules. Cavity; heat exchange base plate is formed by assembling one or more heat exchange base plate units, each heat exchange base plate unit is an integral structure and is provided with a plurality of first flow channels; the side plate is an integral structure and at least one of which is provided with The second flow channel; one or more heat exchange substrate units connecting the side plate and the heat exchange substrate by welding so that the first flow channel and the plurality of second flow channels together form a heat exchange loop channel, wherein the heat exchange loop The liquid inlet and the liquid outlet of the channel are arranged on at least one side plate provided with the second flow channel. The battery pack case of the invention has high material utilization rate, low cost, good expandability and good reliability.

Description

Battery pack case and battery pack with heat exchange function

The invention belongs to the technical field of batteries, and relates to a battery pack case with a heat exchange function and a battery pack using the battery pack case.

At present, in the application of battery packs (also known as "battery power systems"), especially in the field of new energy electric vehicles, battery packs are required to have high specific energy, high safety factor and long service life; The battery pack with high energy density will generate a certain amount of heat during operation. If the heat cannot be taken away in time, it will cause great harm to the life and safety performance of the battery pack. Therefore, thermal management of the battery pack is required. For example, a lightweight battery pack needs to be designed to ensure that the battery is maintained at a suitable temperature, so as to meet the requirements of the high energy density of the battery pack and the lightweight of the entire vehicle. With increasing competition, cost control and lightweighting of automotive design have become important indicators. In the traditional battery pack with a battery liquid cooling system, its structure and its shortcomings are mainly manifested in the following aspects: (1) The cooling plate or cooling pipe and the shell structure are designed separately, and then assembled together to form the battery pack. The utilization rate is low and the processing cost is high; (2) The cooling pipes are designed separately, and they are connected with the heat exchange substrate through joints, which increases the risk of coolant leakage, increases the manufacturing cost, and has certain requirements for the installation space; (3) When When the battery module or the structure of the battery pack in the battery pack changes (for example, if the size of the battery pack simply changes from the length and width directions), the battery pack casing needs to be redesigned and re-molded, and the processing cost is high. Portability is poor.

The aim of the present invention is to disclose a solution which obviates or at least mitigates the drawbacks of the prior art solutions as stated in one or more of the above aspects. The aim of the present invention is also to achieve one or more of the following advantages: - Improve the material utilization of the battery pack casing and reduce its manufacturing and processing costs; - Avoid the use of separate cooling pipes and joints; - Improve the reliability of the battery pack casing - Improve the scalability of the battery pack case; - Reduce the cost of developing battery pack cases of different sizes and shorten the development cycle. In order to achieve the above purpose or other purposes, the present invention provides the following technical solutions. According to an aspect of the present invention, there is provided a battery pack case with a heat exchange function, comprising a heat exchange base plate and a plurality of side plates fixed on the heat exchange base plate, wherein the heat exchange base plate and the plurality of side plates are basically Surrounding and forming a cavity for accommodating and fixing one or more battery modules; The heat exchange substrate is formed by assembling one or more heat exchange substrate units, and each of the heat exchange substrate units is an integral structure and is provided with There are a plurality of first flow passages; The side plate is an integral structure and at least one of the side plates is provided with a second flow passage; One or more heat exchange substrate units of the side plate and the heat exchange substrate are connected by welding so as to make the The first flow channel and the plurality of second flow channels together form a heat exchange loop channel, wherein the liquid inlet and the liquid outlet of the heat exchange loop channel are arranged on the second flow channel provided with the liquid inlet and outlet. of at least one side panel. According to the battery pack case of an embodiment of the present invention, the heat exchange base plate unit and its first flow channel are integrally formed by extrusion, and the side plate is integrally formed by extrusion. According to the battery pack case of an embodiment of the present invention, the heat exchange base plate unit and the side plate of the corresponding size suitable for the size of the cavity are formed by cutting after extrusion and integral molding. According to the battery pack case according to an embodiment of the present invention, the number and/or size of the heat exchange substrate units is determined according to the size of the cavity. According to the battery pack case of an embodiment of the present invention, the size of the side plate is determined according to the size of the cavity. According to the battery pack case according to an embodiment of the present invention, the size of the cavity is determined according to the number and/or size of the battery modules contained therein. According to the battery pack case of an embodiment of the present invention, the inner surface of the first flow channel of the heat exchange base plate unit is provided with reinforced heat exchange ribs. According to the battery pack case according to an embodiment of the present invention, the heat exchange base plate unit includes a support structure rib provided between the adjacent first flow channels. The battery pack case according to an embodiment of the present invention, wherein a plurality of the first flow channels of the heat exchange substrate unit are arranged in parallel and pass through the heat exchange substrate unit. According to the battery pack case according to an embodiment of the present invention, the widths of the plurality of first flow channels of the heat exchange substrate unit are configured to be the same or different; and/or the widths of all the different heat exchange substrate units are configured to be the same or different. The widths of the first flow channels are configured to be the same or different. According to the battery pack case according to an embodiment of the present invention, the heat exchange substrate unit is provided with a module mounting beam and a module mounting hole for fixedly installing the battery module. According to the battery pack case according to an embodiment of the present invention, the side plates include two left and right side plates, a front side plate and a rear side plate, and the second flow channel is disposed in at least one of the two left and right side plates, The second flow channel is provided in at least one of the front side plate and the rear side plate. According to the battery pack case according to an embodiment of the present invention, the left and right side plates include anti-collision beams disposed protruding toward the outer side of the battery pack case. According to the battery pack case according to an embodiment of the present invention, the anti-collision beam is provided with a fixing hole for fixing the battery pack case as a whole. According to the battery pack case of an embodiment of the present invention, a heat exchange substrate connecting groove is provided on the side of the second flow channel of the left and right side plates facing the heat exchange substrate. According to the battery pack case according to an embodiment of the present invention, a second flow channel connecting interface is provided on the side of the second flow channel of the front side plate and/or the rear side plate facing the left and right side plates. According to the battery pack case of an embodiment of the present invention, a liquid inlet slot is provided on the outer side wall of at least one of the side plates, and a water inlet and outlet structure is installed on the liquid inlet slot. According to the battery pack case of an embodiment of the present invention, the liquid inlet, the liquid outlet and the liquid separator are provided on the water inlet and outlet structure, wherein the liquid separator extends into the side plate in the second channel. According to the battery pack case of an embodiment of the present invention, the top end of the side plate is provided with a sealing groove for accommodating the sealant. The battery pack case according to an embodiment of the present invention, wherein the battery pack case further includes a cover plate, and the cover plate seals the cavity through the sealant. According to the battery pack case according to an embodiment of the present invention, at least one of the side plates is provided with a plurality of hollow grooves and reinforcing ribs between the hollow grooves. According to the battery pack case of an embodiment of the present invention, the heat exchange base plate unit and its first flow channel are integrally formed by extrusion of an aluminum material, and the side plate is integrally formed by extrusion of an aluminum material. According to the battery pack case of an embodiment of the present invention, the welding is friction stir welding or laser welding. According to an embodiment of the present invention, the battery pack case further includes a heat shield placed below the heat exchange substrate. According to the battery pack case according to an embodiment of the present invention, a flow damping member is provided inside at least a part of the second flow channel. According to yet another aspect of the present invention, a battery pack is provided, comprising: any one of the battery pack casings described above; and one or more battery modules fixed in the cavity of the battery pack casing. In the battery pack case of the present disclosure, the first flow channel and the second flow channel for forming the heat exchange loop channel are respectively integrated in the heat exchange base plate and the side plate of the integrated structure, avoiding the use of separate cooling Tubes and joints can improve the material utilization rate of the battery pack casing, reduce its manufacturing and processing costs, and at the same time have good reliability, low risk of coolant leakage, reduce the installation space of the battery pack casing, and reduce its maintenance costs; The case has good expandability, and the cost and cycle of developing battery cases of different sizes are low.

The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the same reference numerals refer to the same elements or components, and thus, their descriptions will be omitted. Herein, orientation terms such as "upper", "lower", "front", "rear", "left", "right" are defined relative to the orientation in which the battery pack is exemplarily located in FIG. 1 and should be It is understood that these directional terms are relative concepts, they are used for relative description and clarification, rather than limiting the orientation of any embodiment to a specific direction or orientation, and the corresponding orientation of each directional term may vary according to the battery case The orientation of the body placement changes accordingly. FIG. 1 is a schematic structural diagram of a battery pack case according to an embodiment of the present invention. FIG. 1 also shows an expanded view of a battery pack (or referred to as a power battery system) and a battery pack case 100 used in the battery pack according to an embodiment of the present invention, wherein one of the battery modules 2 inside the battery pack is not shown. The electrical connection components and the control and detection unit between the components. The battery pack can be used as a power battery system of an electric vehicle, which is fixed on the electric vehicle to provide energy for components such as motors. The battery pack case 100 mainly includes a heat exchange base plate 5 and a plurality of side plates fixed on the heat exchange base plate 5, wherein the heat exchange base plate 5 and the plurality of side plates basically surround and form a cavity 101 as one of the energy storage components or the plurality of side plates. A plurality of battery modules 2 are fixed in the cavity 101. Therefore, the shape and size of the cavity 101 can be determined according to factors such as the number, size and shape of the battery modules 2. For example, the battery can be pre-determined according to the vehicle type, etc. The specification, size, quantity, etc. of the module 2 can determine the size of the cavity 101 to be formed. As shown in FIG. 1 , the heat exchange substrate 5 can be used as a bearing component of the battery module 2 , and a cover plate 1 (eg, a casing upper cover) can be provided on the opposite side thereof to close the cavity 101 . The cover plate 1 can be integrally stamped and formed by using a better thermally conductive material (for example, aluminum material). As shown in FIG. 1 , in one embodiment, the cavity 101 is substantially block-shaped, and the side panels used to surround and form the cavity 101 mainly include a left side panel, a right side panel, a front side panel 8 and a rear side panel 3 , wherein the left side panel and the right side plate have a completely symmetrical structure in the direction, therefore, they are marked as 4, that is, the left and right side plates 4. Specifically, the battery pack case 100 further includes a heat insulation plate 6 , a blocking plate 7 and a water inlet and outlet structure 9 provided on the front side plate 8 . Wherein, the heat insulation plate 6 is placed under the heat exchange substrate 5, and is used to isolate the heat of the battery pack casing 100 from being transferred to other components of the electric vehicle or the outside world. As shown in FIG. 1 , one rear side plate 3 , two left and right side plates 4 , one front side plate 8 , one heat exchange base plate 5 , one heat insulation plate 6 , one water inlet and outlet structure 9 and multiple blocking plates 7 basically The lower battery casing that constitutes the battery pack casing 100 can be fixedly connected by welding methods such as friction stir welding or laser welding. The cover plate 1 constitutes the upper battery casing of the battery pack casing 100 , and the installation method thereof will be exemplified below. The main components of the battery pack case 100 according to the embodiment of the present invention are further described below with reference to FIGS. 2 to 6 . FIG. 2 shows one of the heat exchange substrate units 50 of the heat exchange substrate 5 . The heat exchange substrate 5 may be formed by assembling one or more heat exchange substrate units 50 , and the number and/or size of the heat exchange substrate units 50 is determined according to the size of the cavity 101 surrounded by the heat exchange substrate 5 . Each heat exchange base plate unit 50 is of an integral structure and is provided with a plurality of first flow channels 54 . Specifically, as shown in FIG. 2 , each heat exchange base plate unit 50 has a heat exchange surface 51 for fixedly installing the battery module 2 . The module mounting beam 52 and the module mounting hole 53, as well as the first flow channel 54, the strengthening heat exchange rib 55, and the supporting structure rib 56. The heat exchange surface 51 is in contact with the bottom of the battery module 2 through the thermal conductive material, and exchanges heat with the battery module 2, thereby heating or cooling it, and the reinforced heat exchange ribs 55 on the inner surface of the first flow channel 54 can strengthen The heat exchange between the heat exchange surface 51 and the battery module 2 improves the heating or cooling efficiency; the battery module 2 is installed and fixed on the module mounting beam 52 of the heat exchange substrate 5 at the bottom, specifically, for example, locked to the bottom of the heat exchange substrate 5 by bolts. The battery module 2 is locked by the module mounting hole 53 . In this way, the heat exchange substrate 5 not only serves as a bearing and fixing structure for the battery module 2 , but also has a heat exchange function. In one embodiment, the heat exchange substrate unit 50 can be integrally formed by extrusion using, but not limited to, aluminum, which not only has high strength, but also has good thermal conductivity, simple processing, high material utilization, and low cost. In the process of extrusion and integral molding, the heat exchange surface 51 , the module mounting beam 52 , the first flow channel 54 , the strengthening heat exchange ribs 55 , the support structure ribs 56 , etc. can be formed together at the same time. Wherein, the plurality of first flow channels 54 may be arranged in parallel and pass through the heat exchange substrate unit 50, for example, and occupy the main area of the heat exchange substrate unit 50. Therefore, not only the heat exchange efficiency is high, but also the material utilization rate is high. Support structural ribs 56 are arranged between the flow channels 54 . The number and specific arrangement of the first flow channels 54 are not limited. It should be understood that when the plurality of heat exchange substrate units 50 are assembled to form the heat exchange substrate 5, the plurality of first flow channels 54 of the plurality of heat exchange substrate units 50 Correspondingly, they can be connected to each other to form a flow channel inside the heat exchange substrate 5 . In one embodiment, as shown in FIG. 3 , the left and right side plates 4 of the battery pack case 100 are left or right side plates. The left and right side plates 4 are integral structures and at least one of the left and right side plates 4 is provided with a second flow channel 43 . In one embodiment, the left and right side plates 4 have horizontal portions and vertical portions as side walls, which are substantially inverted T-shaped structures. In one embodiment, a second flow channel 43 is provided in the horizontal portion of the left and right side plates 4 , and a heat exchange substrate connecting groove 45 is arranged on the side of the second flow channel 43 facing the heat exchange substrate 5 . One each is symmetrically arranged, and the heat exchange substrates 5 are connected through the heat exchange substrate connecting grooves 45, so that the second flow channel 43 in the left and right side plates 4 and the first flow channel 54 in the heat exchange substrate 5 can communicate with each other, and can be used together to form The heat exchange loop channel 10 is shown in FIG. 6 . In one embodiment, the leveling portion of the left and right side plates 4 includes an anti-collision beam 47 protruding toward the outer side of the battery pack casing. The package body 100 is installed and fixed with the vehicle. Therefore, the anti-collision beam 47 can play the role of integrally fixing and supporting the battery pack and preventing the collision. Continuing as shown in FIG. 3 , in one embodiment, a sealing groove 42 is provided at the top of the vertical part of the left and right side plates 4 , and sealant can be applied to the sealing groove 42 before the cover plate 1 is installed to realize the battery upper casing and the battery Seal of the lower case. In order to realize the overall light structure, several hollow grooves 44 can be arranged in the anti-collision beam 47 of the horizontal part and the vertical part of the left and right side plates 4, and reinforcing ribs 46 can be arranged between the hollow grooves 44 to ensure the structural strength of the left and right side plates 4. The left and right side plates 4 shown in FIG. 3 can be integrally formed by extrusion using, but not limited to, aluminum materials, which not only have high strength, but also are simple to process, high in material utilization, and low in cost. In the process of extrusion and integral molding, the anti-collision beam 47, the hollow groove 44, the second flow channel 43 and the sealing groove 42 shown in FIG. 3 can be formed at the same time, thereby forming an integral structure. The processing method and the like are used to form the mounting holes 41 and the like, and the entire preparation process is simple. It should be understood that the size of the left and right side plates 4 can be determined according to the size of the cavity 101 . During its processing, after extrusion and integral molding, it can be cut and formed according to the size. Even if the size of the cavity 101 of the battery pack case 100 changes, there is no need to open a separate mold to form a mold for extrusion integral molding. Just adjust the size when cutting. Similarly, for the heat exchange substrate unit 50, it can also be cut and formed according to the size after extrusion and integral molding. Even if the size of the cavity 101 of the battery pack case 100 changes, there is no need to open another mold for extrusion. The one-piece mold can be adjusted in size when cutting. Therefore, the expandability of the battery pack case 100 is good, and the cost and cycle of developing the battery pack case 100 of different sizes can be greatly reduced. In one embodiment, the structure of the front side plate 8 of the battery pack case 100 is shown in FIG. 4 , the front side plate 8 is an integral structure and at least one of the front side plates 8 is provided with a second flow channel 84 . The front side plate 8 also includes a liquid inlet slot 81, a sealing groove 82, a second flow channel connecting interface 83, a hollow groove 85 and a reinforcing rib 86; wherein, on the side of the second flow channel 84 facing the left and right plates A second flow channel connecting interface 83 is provided, and the second flow channel 84 of the front side plate 8 communicates and seals with the second flow channel 43 of the left or right plate through the second flow channel connecting interface 83, so that it can be used together to form a The heat exchange loop channel 10 shown in FIG. 6; the sealing groove 82 can be arranged at the top of the front side plate 8, and before installing the cover plate 1, a sealant can be applied to the sealing groove 82 to realize the battery upper casing and the battery lower casing. In order to realize the overall light structure, several hollow grooves 85 can be arranged in the front side plate 8, and reinforcing ribs 86 can be arranged between the hollow grooves 85 to ensure the structural strength of the front side plate 8. Therefore, the front side plate 8 has high strength, It can take into account both the structure and the function of circulating coolant. Continuing as shown in FIG. 4 , the liquid inlet slot 81 may be provided on the outer side wall of the front side plate 8 , which is used to install the water inlet and outlet structure 9 shown in FIG. 5 . The front side plate 8 shown in FIG. 4 can be integrally formed by extrusion using, but not limited to, aluminum, which not only has high strength, but also is simple to process, high in material utilization, and low in cost. In the process of extrusion and integral molding, the sealing groove 82, the second flow channel connecting interface 83, the hollow groove 85 and the reinforcing ribs 86 shown in FIG. It should be noted that the structure of the rear side plate 3 can be basically the same as that of the front side plate 8, and it can also be integrally formed by extrusion. When both the liquid inlet and the liquid outlet are arranged on the front side plate 8 , the liquid inlet slot 81 may not be arranged on the outer side wall of the rear side plate 3 . In other embodiments, the liquid inlet notch 81 may be provided on both the front side plate 8 and the rear side plate 3 according to the loop mode of the heat exchange loop channel 10 , or the liquid inlet slot 81 may be provided on the rear side plate 3 . The second flow channel connecting interface 83 may not be provided on the outer side wall of the rear side plate 3 , and the second flow channel 84 in the rear side plate 3 does not participate in forming the heat exchange loop channel 10 as shown in FIG. 6 . It should be understood that the size of the rear side panel 3 and the front side panel 8 may be determined according to the size of the cavity 101 . During its processing, after extrusion and integral molding, it can be cut and formed according to the size. Even if the size of the cavity 101 of the battery pack case 100 changes, there is no need to open a separate mold to form a mold for extrusion integral molding. Just adjust the size when cutting. In one embodiment, the water inlet and outlet structure 9 is specifically shown in FIG. 5 , which includes a liquid inlet 91, a liquid outlet 92, a liquid separator 93 and an installation slot 94; when installing the water inlet and outlet structure 9, the installation slot is The port 94 is in sealing engagement with the liquid inlet slot 81, and the liquid separator 93 extends into the second flow channel 84 to basically isolate the left and right parts of the second flow channel 84, so that the liquid passes through the liquid inlet 91 and the liquid outlet 92 in the battery pack. Flow in the heat exchange loop channel 10 in the casing 100 . Specifically, the specific embodiment is illustrated by taking the cavity 101 containing 8 battery modules 2 as shown in FIG. 1 as an example to illustrate the specific embodiment. In order to form the cavity 101 of the corresponding size, the heat exchange substrate 5 is assembled by using, for example, eight heat exchange substrate units 50 . , at the same time use two left and right side plates 4 oppositely arranged, one front side plate 8 and one rear side plate 3 oppositely arranged, at the corner connection of the front side plate 8 and the left and right side plates 4, or the rear side plate 3 and the left and right side plates 4 corners At the connection, a plurality of blocking plates 7 are used, and they are connected and sealed by friction stir welding or laser welding, so as to form the lower casing of the battery, and basically surround the cavity 101 . In addition, the lower casing of the battery is fixed on the heat insulation plate 6 by means of bolting or glue connection, and the heat insulation plate 6 acts as a heat insulation function of the battery pack and reduces the heat exchange between the battery pack and the outside world. It should be noted that, each heat exchange base plate unit 50 of the heat exchange base plate 5 can be integrally formed by extrusion of aluminum material, and has the characteristics of high strength structure and light quality. The base plate 5 as a whole plays the role of fixing and supporting the battery module 2, and at the same time, it can also heat or cool the battery module 2 to realize heat exchange. In this example, the left or right side plate 4 and the front side plate 8 are aluminum extruded profiles, which have high-strength structure and light-weight characteristics, and the inside is extruded with a flow channel for the circulation of cooling liquid, which saves the cost of separately arranging cooling pipes and avoids cooling pipes. The safety risks caused by cracks and the like are greatly improved, and the reliability is greatly improved; the anti-collision beam 47 also plays the role of fixedly supporting the battery pack system and anti-collision. In this embodiment, the sealing grooves 42 , 82 and 31 are respectively extruded by the left or right side plate 4 , the front side plate 8 and the rear side plate 3 by extrusion, and the connected sealing grooves can be formed by welding between the side plates. , to facilitate the sealing between the cover plate 1 and the lower case of the battery. In this embodiment, each plate of the battery lower case is connected by friction stir welding or laser welding, so as to achieve high-strength structural sealing and connection, and form a sealed heat exchange loop channel 10 . As shown in FIG. 6 , in the heat exchange loop channel 10 , a fluid such as water can be used as the cooling liquid. The flow direction of the cooling liquid is shown by the arrow in FIG. 6 . Specifically, the cooling liquid enters the battery case through the liquid inlet 91 . In the body 100, the flow distribution is performed in the second flow channel 43 in the left and right side plates 4 on one side, and then flows to the first flow channel 54 in the heat exchange substrate 5, and the cooling liquid flowing in the first flow channel 54 can mainly interact with the battery. The module 2 exchanges heat, for example, to achieve heating or cooling of the battery module 2, and then flows through the second flow channel 43 in the left and right side plates 4 on the other side, and further flows into the second flow channel 84 of the front side plate 8, It flows out through the liquid outlet 92 . Further as shown in FIG. 6 , the two left and right side plates 4 , the front side plate 8 , the rear side plate 3 , the liquid partition plate 93 and the heat exchange substrate 5 together constitute the cooling liquid circulation boundary, and the cooling liquid enters the first part of the front side plate 8 from the liquid inlet 91 . The second flow channel 84 then enters the second flow channel 43 of the left and right side plates 4 on one side. The fluid is divided in the second flow channel 43 and enters the different first flow channels 54 of different heat exchange substrate units 50 respectively, and is installed on the The plurality of battery modules 2 on the heat exchange substrate 5 are heated or cooled, and the cooling liquid collects in the second flow channels 43 of the left and right side plates 4 on the other side, flows into the second flow channels 84 of the front side plate 8, and passes through the liquid outlet. 92 flows out to realize the coolant circulation. The non-stop circulation of the cooling liquid in the heat exchange circulation channel 10 can continuously heat or cool the battery modules 2 in the battery pack. It can be seen that the formation of the heat exchange loop channel 10 does not depend on a separate cooling pipe, and there is no need to set a joint inside the battery pack shell 100, which effectively avoids the use of cooling pipes and joints, greatly reduces the risk of coolant leakage, and also The cost of the battery pack case 100 is reduced; the installation space of the battery pack case 100 is reduced, the heat exchange loop channel 10 is less risky and maintenance is not required or reduced, and the maintenance cost of the battery pack case 100 is reduced. It should be noted that the second flow channel 43 and the second flow channel 84 mainly function to communicate with the different first flow channels 54, thereby jointly forming the heat exchange loop channel 10. However, the second flow channel 43 and the second flow channel The fluid in the flow channel in 84 also has a heat exchange function in part, and because of its small volume, it does not serve as the main body of heat exchange. It should be noted that the heat exchange loop channel 10 in the battery pack casing 100 is roughly in the “U” shape as shown in FIG. 6 . In other embodiments, by arranging the first flow channel 43 , the second flow channel 43 , The second flow channel 84 and the like can make the heat exchange loop channel 10 in the battery pack case 100 approximately in a "Z" or "S" shape. In one embodiment, corresponding flow damping structures or flow damping components are added to the second flow channels 43 in the left and right side plates 4 according to requirements, and at the same time, different first flow channels 54 and/or different heat exchange of the heat exchange substrate unit 50 can be adjusted. The widths of the different first flow channels 54 of the base plate unit 50 are used to realize the overall flow distribution function in the battery pack casing 100 , which can meet the heat exchange requirements when the battery module 2 is expanded. In one embodiment, the expandable heat exchange substrate 5 can be formed by connecting a plurality of heat exchange substrate units 5 according to requirements, and the lengths of the corresponding left and right side plates 4, front side plates 8, and rear side plates 3 also change; 4. The number and cross-sectional size of the second flow channels of the front side plate 8 and the rear side plate 3 can be specifically set to meet different requirements. It should be noted that, even if the size of the cavity 101 of the battery pack case 100 changes, there is no need to separately open a mold to form a mold for extrusion integral molding, and the size of the heat exchange substrate unit 50 and the side plate can be adjusted during cutting. Therefore, the battery pack case 100 of the embodiment of the present invention has good expandability, and does not need to develop additional molds for extrusion and integral molding, thereby reducing the cost and cycle of developing battery pack cases 100 of different sizes or models. It should be noted that the overall weight of the battery pack case 100 of the embodiment of the present invention is light, therefore, the weight of the battery pack formed based on the battery pack is also light, which is beneficial to realize the lightweight requirement of electric vehicles when applied to electric vehicles . The above examples mainly illustrate the battery pack case and the battery pack of the present invention. Although only a few of these embodiments of the present invention have been described, it will be understood by those of ordinary skill in the art that the present invention may be embodied in many other forms without departing from the spirit and scope thereof. Accordingly, the examples and embodiments shown are to be regarded as illustrative and not restrictive, and the present invention may cover various modifications and replace.

100‧‧‧Battery pack shell 1‧‧‧Cover plate 2‧‧‧Battery module 3‧‧‧Rear side plate 4‧‧‧Left and right side plate 5‧‧‧Heat exchange substrate 6‧‧‧Insulation plate 7‧‧‧Blocking plate 8‧‧‧Front side plate 9‧‧‧Water inlet and outlet structure 11‧‧‧Reinforcing ribs 12‧‧‧Installation side 13‧‧‧Installation hole 101‧‧‧Cavity 50‧‧‧Heat exchange substrate Unit 51‧‧‧Heat exchange surface 52‧‧‧Module mounting beam 53‧‧‧Module mounting hole 54‧‧‧First flow channel 55‧‧‧Reinforcing heat exchange rib 56‧‧‧Supporting structural rib 31‧‧‧ Seal groove 41‧‧‧Fixing hole 42‧‧‧Sealing groove 43‧‧‧Second flow channel 44‧‧‧Hollow groove 45‧‧‧Heat exchange substrate connecting groove 46‧‧‧Reinforcing rib 47‧‧‧anti-collision beam 81‧‧‧Inlet slot82‧‧‧Sealing slot83‧‧‧Second runner interface 84‧‧‧Second runner85‧‧‧Hollow slot86‧‧‧Reinforcing rib91‧‧‧Inlet Port 92‧‧‧Outlet 93‧‧‧Liquid Baffle 94‧‧‧Installation Slot

The above and other objects and advantages of the present invention will be more fully apparent from the following detailed description taken in conjunction with the accompanying drawings, wherein the same or similar elements are designated by the same reference numerals. FIG. 1 is a schematic structural diagram of a battery pack case according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a heat exchange substrate unit of a battery pack case according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of a left side panel or a right side panel of a battery pack case according to an embodiment of the present invention. FIG. 4 is a schematic structural diagram of a front side plate of a battery pack case according to an embodiment of the present invention. FIG. 5 is a schematic structural diagram of the water inlet and outlet of the battery pack case according to an embodiment of the present invention. 6 is a schematic diagram of a heat exchange loop channel of a battery pack case according to an embodiment of the present invention.

1‧‧‧Cover

2‧‧‧Battery module

3‧‧‧Rear side panel

4‧‧‧Left side panel, Right side panel

5‧‧‧Heat exchange substrate

6‧‧‧Insulation Board

7‧‧‧Blocking plate

8‧‧‧Front side panel

9‧‧‧Water inlet and outlet structure

11‧‧‧Reinforcing ribs

12‧‧‧Installation side

13‧‧‧Mounting holes

31‧‧‧Sealing groove

41‧‧‧Fixing hole

42‧‧‧Sealing groove

81‧‧‧Inlet slot

82‧‧‧Sealing groove

100‧‧‧Battery case

101‧‧‧Cavity

Claims (25)

A battery pack case (100) with heat exchange function, comprising a heat exchange base plate (5) and a plurality of side plates (3, 4, 8) fixed on the heat exchange base plate (5), wherein the heat exchange base plate (5) The thermal base plate (5) and the plurality of side plates (3, 4, 8) substantially surround and form a cavity (101) for accommodating and fixing one or more battery modules (2); characterized in that the heat exchange The base plate (5) is formed by assembling one or more heat exchange base plate units (50), each of the heat exchange base plate units (50) is an integral structure and is provided with a plurality of first flow channels (54); the side plates (3, 4, 8) are integral structures and at least one of them is provided with a second flow channel (43, 84); the side plates (3, 4, 8) and the heat exchange substrate (5) are connected by welding One or more heat exchange substrate units (50) so that the first flow channel (54) and the plurality of second flow channels (43, 84) together form a heat exchange loop channel (10), wherein , the liquid inlet (91) and the liquid outlet (92) of the heat exchange loop channel (10) are arranged on at least one side plate (3, 4, 8) provided with the second flow channel (43, 84) ), which further comprises a heat shield (6) placed under the heat exchange substrate (5). The battery pack case (100) according to claim 1, wherein the heat exchange base plate unit (50) and its first flow channel (54) are integrally formed by extrusion, and the side plates (3, 4) are integrally formed by extrusion. , 8) One-piece molding by extrusion. The battery pack case (100) according to item 2 of the claimed scope, wherein the heat exchange base plate unit of the corresponding size suitable for the size of the cavity (101) is formed by cutting after extrusion and integral molding (50) and the side panels (3, 4, 8). The battery pack case (100) according to claim 1, wherein the number and/or size of the heat exchange base plate units (50) are determined according to the size of the cavity (101). The battery pack case (100) according to claim 1, wherein the size of the side plates (3, 4, 8) is determined according to the size of the cavity (101). The battery pack case (100) according to item 3 or item 4 or item 5 of the claimed scope, wherein the size of the cavity (101) is based on the size of the battery module (2) contained therein. Quantity and/or size determined. The battery pack case (100) according to claim 1, wherein the inner surface of the first flow channel (54) of the heat exchange base plate unit (50) is provided with reinforced heat exchange ribs (55). The battery pack case (100) according to claim 1, wherein the heat exchange base plate unit (50) is included in the adjacent first flow channel Supporting structural ribs (56) arranged between (54). The battery pack case (100) according to claim 1, wherein the plurality of first flow channels (54) of the heat exchange substrate unit (50) are arranged in parallel and pass through the heat exchange substrate unit (50). The battery pack case (100) according to claim 1 or claim 9, wherein the widths of the plurality of first flow channels (54) of the heat exchange substrate unit (50) are configured to be the same or different; and/or the widths of the first flow channels (54) of the different heat exchange substrate units (50) are configured to be the same or different. The battery pack case (100) according to claim 1, wherein the heat exchange substrate unit (50) is provided with a module mounting beam (52) for fixedly mounting the battery module (2) ) and the module mounting hole (53). The battery pack case (100) according to the claim 1, wherein the side plates (3, 4, 8) comprise two left and right side plates (4), a front side plate (8) and a rear side plate ( 3), at least one of the two left and right side plates (4) is provided with the second flow channel (43), and at least one of the front side plate (8) and the rear side plate (3) is provided with the first flow channel (43). Second runner (84). The battery pack case (100) according to claim 12, wherein the left and right side plates (4) include outer surfaces facing the battery pack case (100). The anti-collision beam (47) provided on the side protrudes. The battery pack case (100) according to claim 13, wherein the anti-collision beam (47) is provided with a fixing hole (41) for fixing the battery pack case (100) as a whole ). The battery pack case (100) according to claim 12, wherein a side of the second flow channel (43) of the left and right side plates (4) facing the heat exchange substrate (5) is provided There is a heat exchange substrate connecting groove (45). The battery pack case (100) according to claim 12, wherein the second flow channel (84) of the front side plate (8) and/or the rear side plate (3) faces the left and right side plates A second flow channel connecting interface (83) is arranged on one side of (4). The battery pack case (100) according to claim 1, wherein a liquid inlet slot (81) is provided on the outer side wall of at least one of the side plates (3, 4, 8), and the inlet A water inlet and outlet structure (9) is installed on the liquid trough (81). The battery pack case (100) according to claim 17, wherein the water inlet and outlet structure (9) is provided with the liquid inlet (91), the liquid outlet (92) and the liquid A separator (93), wherein the liquid separator (93) extends into the second flow channels (43, 84) of the side plates (3, 4, 8). The battery pack case (100) according to claim 1, wherein the top ends of the side plates (3, 4, 8) are provided with sealing grooves (82) for accommodating sealants. The battery pack case (100) according to claim 19, wherein the battery pack case (100) further comprises a cover plate (1), and the cover plate (1) is sealed by the sealant the cavity (101). The battery pack case (100) according to claim 1, wherein at least one of the side plates (3, 4, 8) is provided with a plurality of hollow grooves (44, 85) and the hollow grooves Ribs (46, 86) between (44, 85). The battery pack case (100) according to claim 2, wherein the heat exchange base plate unit (50) and its first flow channel (54) are integrally formed by extrusion of an aluminum material, and the side plate (3) , 4, 8) are integrally formed by extrusion of aluminum. The battery pack case (100) according to item 1 or item 22 of the claimed scope, wherein the welding is friction stir welding or laser welding. The battery pack case (100) according to claim 1, wherein at least a part of the second flow channel (43, 84) is provided with a flow damping member. A battery pack, characterized in that it comprises: a battery pack case (100) as described in any one of items 1 to 24 of the scope of the patent application; and a cavity (100) fixed to the battery pack case (100). One or more battery modules (2) in 101).

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