Battery box body and battery pack

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to a battery box and a battery pack, the battery box comprises a cold plate, and a middle longitudinal beam, a first side beam and two second side beams which are all mounted on the cold plate, the middle longitudinal beam is parallel to the first side beam, the middle longitudinal beam is connected with the two second side beams in a first direction, and the middle longitudinal beam is parallel to the first side beam in a second direction. The first edge beam is connected with the two second edge beams in the first direction, the cold plate, the middle longitudinal beam, the first edge beam and the two second edge beams define a module installation cavity, and the module installation cavity penetrates from one second edge beam to the other second edge beam in the first direction. The first direction is parallel to the middle longitudinal beam. The utility model aims to provide a battery box body and a battery pack aiming at at least one technical problem related in the background technology.

Description

Technical Field

[0001] This application relates to the technical field of energy storage devices, and more particularly, to a battery box body and a battery pack. Background Art

[0002] With the continuous development of electric vehicles, the requirements for the safety and driving range of battery packs are getting higher and higher. In the existing battery pack design, an intermediate longitudinal beam and an intermediate cross beam perpendicular to each other are arranged on the cold plate in the battery box body, which will occupy the space inside the battery pack and reduce the volume utilization rate of the battery pack. Summary of the Utility Model

[0003] The purpose of this application is to provide a battery box body and a battery pack for at least one technical problem involved in the background art.

[0004] To achieve the above purpose, this application adopts the following technical solutions:

[0005] One aspect of this application provides a battery box body, including a cold plate, and an intermediate longitudinal beam, a first side beam, and two second side beams all installed on the cold plate. The intermediate longitudinal beam is parallel to the first side beam. In a first direction, the intermediate longitudinal beam is connected to both of the two second side beams, and in the first direction, the first side beam is also connected to both of the two second side beams. The cold plate, the intermediate longitudinal beam, the first side beam, and the two second side beams enclose a module installation cavity. In the first direction, the module installation cavity penetrates from one second side beam to the other second side beam, and the first direction is parallel to the intermediate longitudinal beam.

[0006] Optionally, the battery box body provided by this application further includes a cold plate reinforcing beam installed on the cold plate. The cold plate reinforcing beam includes a first reinforcing plate and a second reinforcing plate whose length directions are both parallel to the first direction. The first reinforcing plate and the second reinforcing plate are perpendicularly connected to each other. The cross section of the cold plate reinforcing beam is L-shaped. The first reinforcing plate is fixedly connected to the first side beam, and the second reinforcing plate is fixedly connected to the cold plate.

[0007] The beneficial effect of this technical solution is that in this way, the cold plate reinforcing beam can bear the acting force perpendicular to the intermediate longitudinal beam, and strengthen the cold plate and the side beam through the cold plate reinforcing beam.

[0008] Optionally, the cold plate reinforcing beam is arranged in the module installation cavity. The first reinforcing plate is attached to and fixedly connected to the first side beam, and the second reinforcing plate is attached to and fixedly connected to the cold plate.

[0009] The beneficial effects of this technical solution are as follows: If the cold plate reinforcing beam is arranged outside the module installation cavity, the cold plate reinforcing beam is likely to fall off when colliding with the outside world. In the embodiment of the present application, the cold plate reinforcing beam is arranged in the module installation cavity, thus avoiding possible collisions between the cold plate reinforcing beam and the outside world.

[0010] Optionally, the cold plate reinforcing beam further includes a plurality of reinforcing ribs arranged in the first direction. The reinforcing ribs are located at the junction of the first reinforcing plate and the second reinforcing plate, and the reinforcing ribs are connected to both the first reinforcing plate and the second reinforcing plate.

[0011] The beneficial effects of this technical solution are as follows: By means of each reinforcing rib, the strength of the cold plate reinforcing beam is increased, and further the purpose of further strengthening the first side beam and the cold plate is achieved.

[0012] Optionally, the first side beam includes a first cylinder and a second cylinder both having a square cross-section. The first cylinder is sleeved outside the second cylinder, and the inner wall of the first cylinder is in contact with the inner wall of the second cylinder.

[0013] The beneficial effects of this technical solution are as follows: In this way, by designing the first side beam into a structure form in which the first cylinder and the second cylinder are sleeved, the overall strength of the first side beam is improved, enabling the first side beam to withstand greater acting forces.

[0014] Another aspect of the present application provides a battery pack, including a battery module and the battery box body provided by the present application. The battery box body is installed in the module installation cavity.

[0015] Optionally, it further includes a cold plate reinforcing beam installed on the cold plate. The cold plate reinforcing beam includes a first reinforcing plate and a second reinforcing plate both having a length direction parallel to the first direction. A groove with a length direction parallel to the first direction is formed on the cold plate. The second reinforcing plate includes a first plate portion, a stepped portion, and a second plate portion sequentially connected in a direction perpendicular to the first reinforcing plate. The first plate portion is connected to the first reinforcing plate. In a direction perpendicular to the second reinforcing plate, the distance between the second plate portion and the first reinforcing plate is greater than the distance between the first plate portion and the first reinforcing plate. The second plate portion is arranged in the groove. The top surface of the second plate portion is fixedly connected to the battery module, the bottom surface of the second plate portion is fixedly connected to the bottom of the groove, and the top surface of the second plate portion is at the same height as the top surface of the cold plate, or the top surface of the second plate portion is located below the top surface of the cold plate.

[0016] The beneficial effects of this technical solution are as follows: In this way, after the second plate part is arranged in the groove, the top surface height of the second plate part is approximately the same as the top surface height of the cold plate, so that the bottom of the battery module installed in the module installation cavity can contact both the top surface of the cold plate and the top surface of the second plate part, thereby enabling the battery module to be stably installed in the module installation cavity.

[0017] Optionally, the top surface of the second plate part is located below the top surface of the cold plate, and the top surface of the second plate part is connected to the battery module through a thermally conductive structural adhesive layer.

[0018] The beneficial effects of this technical solution are as follows: In this way, the gap between the battery module and the second plate part can be filled through the thermally conductive structural adhesive layer, and the thermally conductive structural adhesive can transfer the heat generated by the battery module to the cold plate. In the embodiment of the present application, the second reinforcing plate is connected to the cold plate through structural adhesive.

[0019] Optionally, the battery pack provided by the present application further includes a first module pressing plate. The length direction of the first module pressing plate is parallel to the first direction. The first module pressing plate is located above the battery module and is in contact with the battery module. At both ends of the first module pressing plate in the first direction, they are respectively connected to the two second side beams.

[0020] The beneficial effects of this technical solution are as follows: In this way, the first module pressing plate can effectively fix the battery module in the module installation cavity.

[0021] Optionally, the battery pack provided by the present application includes a second module pressing plate, two battery modules, and two first module pressing plates. Two module installation cavities are formed on the battery box body. The two battery modules are respectively installed in the two module installation cavities in a one-to-one correspondence. One first module pressing plate is located above one battery module, and the other first module pressing plate is located above the other battery module. The second module pressing plate is located above the two battery modules and is in contact with both battery modules. At both ends of the second module pressing plate in the length direction of the second module pressing plate, they are respectively fixedly connected to the two first side beams.

[0022] The beneficial effects of this technical solution are as follows: In this way, the battery pack includes at least two battery modules, improving the power storage capacity of the battery pack. At the same time, through the first module pressing plate and the second module pressing plate, the battery modules can be more firmly fixed in the module installation cavity, improving the safety and reliability of the battery pack during use.

[0023] Optionally, an insulating layer is provided between the cold plate and the battery module, and between the second plate part and the battery module.

[0024] The beneficial effects of this technical solution are as follows: In this way, it is difficult for the battery module to discharge through the cold plate and the cold plate reinforcement plate, improving the safety of the battery pack during use.

[0025] Optionally, the cold plate is riveted to the first side beam, and the cold plate and the first side beam are bonded with structural sealant.

[0026] The beneficial effects of this technical solution are as follows: On the one hand, this provides a relatively high connection strength between the first side beam and the cold plate. On the other hand, it is difficult for external dust and other debris to enter the battery box from the connection position between the first side beam and the cold plate.

[0027] The technical solution provided by this application can achieve at least one of the following beneficial effects:

[0028] For the battery box and the battery pack provided by this application, due to the structural form in which the module installation cavity penetrates from one second side beam to the other second side beam in the direction parallel to the middle longitudinal beam, the middle cross beam in the existing battery pack is removed, enabling the space originally occupied by the middle cross beam to be utilized by the battery module. On the one hand, this improves the volume utilization rate of the battery pack, and on the other hand, it can also improve the energy density of the battery pack.

[0029] The additional technical features and their advantages of this application will be more clearly described in the following content, or can be understood through the specific practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the specific embodiments of this application, the drawings required for use in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 Partial three-dimensional structural schematic diagram of an embodiment of the battery pack provided by an embodiment of this application;

[0032] Figure 2 Partial cross-sectional schematic diagram of an embodiment of the battery pack provided by an embodiment of this application;

[0033] Figure 3 Partial three-dimensional structural schematic diagram of an embodiment of the cold plate reinforcement beam provided by an embodiment of this application;

[0034] Figure 4 Front view structural schematic diagram of an embodiment of the cold plate reinforcement beam provided by an embodiment of this application;

[0035] Figure 5This is a top - view structural schematic diagram of an embodiment of the battery box provided by the embodiments of the present application.

[0036] Reference numerals:

[0037] 01, the first module pressing plate; 02, the second module pressing plate;

[0038] 03, the battery module; 04, the battery box;

[0039] 05, the first cylinder; 06, the second cylinder;

[0040] 07, the first side beam; 08, the first reinforcing plate;

[0041] 09, the first plate part; 10, the step part;

[0042] 11, the second plate part; 12, the cold plate;

[0043] 13, the reinforcing rib; 14, the cold - plate reinforcing beam;

[0044] 15, the second reinforcing plate; 16, the second side beam;

[0045] 17, the middle longitudinal beam; 18, the groove. Detailed implementation manners

[0046] Next, the technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0047] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application 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 thus cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0049] As Figures 1 to 5 shown, one aspect of the present application provides a battery box 04, including a cold plate 12, and a middle longitudinal beam 17, a first side beam 07, and two second side beams 16 all installed on the cold plate 12. The middle longitudinal beam 17 is parallel to the first side beam 07. In a first direction, the middle longitudinal beam 17 is connected to both of the two second side beams 16, and in the first direction, the first side beam 07 is connected to both of the two second side beams 16. The cold plate 12, the middle longitudinal beam 17, the first side beam 07, and the two second side beams 16 enclose a module installation cavity. In the first direction, the module installation cavity penetrates from one second side beam 16 to the other second side beam 16. The first direction is parallel to the middle longitudinal beam 17.

[0050] In the embodiment of the present application, the statement that the module installation cavity penetrates from one second side beam 16 to the other second side beam 16 in the first direction means that the middle cross beam perpendicular to the middle longitudinal beam 17 in the existing battery pack is removed, so that there is no middle cross beam in the module installation cavity. It can be understood that in the embodiment of the present application, the middle longitudinal beam 17 is located in the middle of one side plate of the cold plate 12.

[0051] For the battery box 04 provided by the embodiment of the present application, due to the structural form that the module installation cavity penetrates from one second side beam 16 to the other second side beam 16 in the direction parallel to the middle longitudinal beam 17, the middle cross beam in the existing battery pack is removed, so that the space originally occupied by the middle cross beam can be utilized by the battery module. On the one hand, the volume utilization rate of the battery pack is improved, and on the other hand, the energy density of the battery pack can also be improved.

[0052] Optionally, the battery box body 04 provided in the embodiment of the present application further includes a cold plate reinforcing beam 14 mounted on the cold plate 12. The cold plate reinforcing beam 14 includes a first reinforcing plate 08 and a second reinforcing plate 15 whose length directions are both parallel to the first direction. The first reinforcing plate 08 and the second reinforcing plate 15 are perpendicularly connected to each other. The cross-section of the cold plate reinforcing beam 14 is L-shaped. The first reinforcing plate 08 is fixedly connected to the first side beam 07, and the second reinforcing plate 15 is fixedly connected to the cold plate 12. In this way, the cold plate reinforcing beam 14 can bear the acting force perpendicular to the middle longitudinal beam 17, and strengthen the cold plate 12 and the side beam through the cold plate reinforcing beam 14.

[0053] Optionally, the cold plate reinforcing beam 14 is arranged in the module installation cavity. The first reinforcing plate 08 is attached to and fixedly connected to the first side beam 07, and the second reinforcing plate 15 is attached to and fixedly connected to the cold plate 12. If the cold plate reinforcing beam 14 is arranged outside the module installation cavity, the cold plate reinforcing beam 14 is likely to fall off when colliding with the outside world. In the embodiment of the present application, by arranging the cold plate reinforcing beam 14 in the module installation cavity, the possible collision between the cold plate reinforcing beam 14 and the outside world is avoided.

[0054] Optionally, the cold plate reinforcing beam 14 further includes a plurality of reinforcing ribs 13 arranged in the first direction. The reinforcing ribs 13 are located at the junction of the first reinforcing plate 08 and the second reinforcing plate 15, and the reinforcing ribs 13 are connected to both the first reinforcing plate 08 and the second reinforcing plate 15. The strength of the cold plate reinforcing beam 14 is increased through each reinforcing rib 13, and further the purpose of strengthening the first side beam 07 and the cold plate 12 is achieved.

[0055] Optionally, the first side beam 07 includes a first cylinder 05 and a second cylinder 06 both having a square cross-section. The first cylinder 05 is sleeved outside the second cylinder 06, and the inner wall of the first cylinder 05 is attached to the inner wall of the second cylinder 06. In this way, by designing the first side beam 07 into a structure form in which the first cylinder 05 and the second cylinder 06 are sleeved, the overall strength of the first side beam 07 is improved, so that the first side beam 07 can bear a greater acting force.

[0056] Another aspect of the present application provides a battery pack, including a battery module 03 and the battery box body 04 provided in the embodiment of the present application. The battery box body 04 is installed in the module installation cavity.

[0057] The battery pack provided by this application adopts the battery box body 04 provided by this application. Due to the structural form that the module installation cavity penetrates from one second side beam 16 to the other second side beam 16 in a direction parallel to the middle longitudinal beam 17, the middle cross beam in the existing battery pack is removed, so that the space originally occupied by the middle cross beam can be utilized by the battery module 03. On the one hand, the volume utilization rate of the battery pack is improved, and on the other hand, the energy density of the battery pack can also be improved.

[0058] Optionally, a groove 18 is formed on the cold plate 12, and the length direction of the groove 18 is parallel to the first direction. The second reinforcing plate 15 includes a first plate portion 09, a stepped portion 10, and a second plate portion 11 that are sequentially connected in a direction perpendicular to the first reinforcing plate 08. The first plate portion 09 is connected to the first reinforcing plate 08. In a direction perpendicular to the second reinforcing plate 15, the distance between the second plate portion 11 and the first reinforcing plate 08 is greater than the distance between the first plate portion 09 and the first reinforcing plate 08. The second plate portion 11 is disposed in the groove 18. The top surface of the second plate portion 11 is fixedly connected to the battery module 03, the bottom surface of the second plate portion 11 is fixedly connected to the bottom of the groove 18, and the top surface of the second plate portion 11 is at the same height as the top surface of the cold plate 12, or the top surface of the second plate portion 11 is located below the top surface of the cold plate 12. In this way, after the second plate portion 11 is disposed in the groove 18, the top surface height of the second plate portion 11 is approximately the same as the top surface height of the cold plate 12, so that the bottom of the battery module 03 installed in the module installation cavity can contact both the top surface of the cold plate 12 and the top surface of the second plate portion 11, and further the battery module 03 is stably installed in the module installation cavity.

[0059] Optionally, the top surface of the second plate portion 11 is located below the top surface of the cold plate 12, and the top surface of the second plate portion 11 is connected to the battery module 03 through a thermally conductive structural adhesive layer. In this way, the gap between the battery module 03 and the second plate portion 11 can be filled through the thermally conductive structural adhesive layer, and the thermally conductive structural adhesive can transfer the heat generated by the battery module 03 to the cold plate 12. In the embodiment of this application, the second reinforcing plate 15 and the cold plate 12 are connected through structural adhesive. In the embodiment of this application, the overlapping distance between the battery module 03 and the second plate portion 11 is not less than 50 mm.

[0060] Optionally, an insulating layer is provided between the cold plate 12 and the battery module 03, and between the second plate portion 11 and the battery module 03. In this way, it is not easy for the battery module 03 to discharge through the cold plate 12 and the cold plate 12 reinforcing plate, improving the safety of the battery pack during use.

[0061] Optionally, the cold plate 12 is riveted to the first side beam 07, and the cold plate 12 and the first side beam 07 are bonded with structural sealant. In this way, on the one hand, the connection strength between the first side beam 07 and the cold plate 12 is relatively high, and on the other hand, it is not easy for external dust and other sundries to enter the battery box 04 from the position where the first side beam 07 is connected to the cold plate.

[0062] Optionally, the battery pack provided by the embodiment of the present application further includes a first module pressing plate 01. The length direction of the first module pressing plate 01 is parallel to the first direction. The first module pressing plate 01 is located above the battery module 03, and the first module pressing plate 01 is in contact with the battery module 03. At both ends of the first module pressing plate 01 in the first direction, they are respectively connected to the two second side beams 16. In this way, the first module pressing plate 01 can effectively fix the battery module 03 in the module installation cavity.

[0063] Optionally, the battery pack provided by the embodiment of the present application includes a second module pressing plate 02, two battery modules 03, and two first module pressing plates 01. Two module installation cavities are formed on the battery box 04. The two battery modules 03 are respectively installed in the two module installation cavities. One first module pressing plate 01 is located above one battery module 03, and the other first module pressing plate 01 is located above the other battery module 03. The second module pressing plate 02 is located above the two battery modules 03, and the second module pressing plate 02 is in contact with both battery modules 03. At both ends of the second module pressing plate 02 in the length direction of the second module pressing plate 02, they are respectively fixedly connected to the two first side beams 07. In this way, the battery pack includes at least two battery modules 03, improving the power storage capacity of the battery pack. At the same time, the battery module 03 can be relatively firmly fixed in the module installation cavity through the first module pressing plate 01 and the second module pressing plate 02, improving the safety and reliability of the battery pack during use.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery box, characterized in that: It includes a cold plate, and an intermediate longitudinal beam, a first side beam and two second side beams all installed on the cold plate, the intermediate longitudinal beam is parallel to the first side beam, the intermediate longitudinal beam is connected to the two second side beams in a first direction, and the first side beam is connected to the two second side beams in a first direction, the cold plate, the intermediate longitudinal beam, the first side beam and the two second side beams enclose a module installation cavity, the module installation cavity passes through from one second side beam to another second side beam in the first direction, and the first direction is parallel to the intermediate longitudinal beam.

2. The battery box according to claim 1, characterized in that: It also includes a cold plate reinforcement beam installed on the cold plate, the cold plate reinforcement beam includes a first reinforcement plate and a second reinforcement plate whose length directions are parallel to the first direction, the first reinforcement plate and the second reinforcement plate are vertically connected to each other, the cross-section of the cold plate reinforcement beam is L-shaped, the first reinforcement plate is fixedly connected to the first side beam, and the second reinforcement plate is fixedly connected to the cold plate.

3. The battery box according to claim 2, characterized in that: The cold plate reinforcement beam is arranged in the module installation cavity, the first reinforcement plate is fitted and fixedly connected to the first side beam, and the second reinforcement plate is fitted and fixedly connected to the cold plate.

4. The battery box according to claim 3, characterized in that: The cold plate reinforcement beam further includes a plurality of reinforcement ribs arranged in the first direction, the reinforcement ribs are located at the intersection of the first reinforcement plate and the second reinforcement plate, and the reinforcement ribs are connected to both the first reinforcement plate and the second reinforcement plate.

5. The battery case according to any one of claims 1 to 4, characterized in that: The first side beam comprises a first cylinder and a second cylinder both of which have square cross sections. The first cylinder is sleeved outside the second cylinder, and the inner wall of the first cylinder fits the inner wall of the second cylinder.

6. A battery pack, characterized in that: It comprises a battery module and a battery box as claimed in any one of claims 1 to 5, wherein the battery box is installed in the module installation cavity.

7. The battery pack according to claim 6, characterized in that: It also includes a cold plate reinforcement beam installed on the cold plate, the cold plate reinforcement beam including a first reinforcement plate and a second reinforcement plate whose length directions are both parallel to the first direction, a groove whose length direction is parallel to the first direction is formed on the cold plate, the second reinforcement plate including a first plate portion, a step portion and a second plate portion connected in sequence in a direction perpendicular to the first reinforcement plate, the first plate portion is connected to the first reinforcement plate, the distance between the second plate portion and the first reinforcement plate in a direction perpendicular to the second reinforcement plate is greater than the distance between the first plate portion and the first reinforcement plate, the second plate portion is arranged in the groove, the top surface of the second plate portion is fixedly connected to the battery module, the bottom surface of the second plate portion is fixedly connected to the bottom of the groove, the top surface of the second plate portion is at the same height as the top surface of the cold plate, or the top surface of the second plate portion is located below the top surface of the cold plate.

8. The battery pack according to claim 7, characterized in that: The top surface of the second plate portion is located below the top surface of the cold plate, and the top surface of the second plate portion is connected to the battery module via a heat-conducting structural adhesive layer.

9. The battery pack according to claim 6, characterized in that: It also includes a first module pressure plate, the length direction of the first module pressure plate is parallel to the first direction, the first module pressure plate is located above the battery module, and the first module pressure plate is in contact with the battery module, and the two ends of the first module pressure plate in the first direction are respectively connected to the two second side beams.

10. The battery pack according to claim 9, characterized in that: It includes a second module pressure plate, two battery modules and two of the first module pressure plates, two module installation cavities are formed on the battery box, two battery modules are installed in the two module installation cavities one by one, one of the first module pressure plates is located above one of the battery modules, another of the first module pressure plates is located above another of the battery modules, the second module pressure plate is located above the two battery modules, and the second module pressure plate is fitted with the two battery modules, and the two ends of the second module pressure plate in the length direction of the second module pressure plate are fixedly connected to the two first side beams respectively.

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