Battery box, battery device, power utilization device and battery box injection mold

Abstract

The utility model discloses a battery box, a battery device, a power utilization device and a battery box injection mold. The battery box comprises a box body, a heat management part and a buffer layer, the box body is provided with an accommodating space for accommodating the battery monomer and comprises a wall part; the heat management component is located on the side, facing the containing space, of the wall part or located on the side, deviating from the containing space, of the wall part. The buffer layer is at least partially formed between the heat management component and the wall part in an injection molding mode, and the heat management component and the wall part are connected into an integrated structure through the buffer layer. According to the scheme, the heat management part and the wall part are connected into an integrated structure through injection molding of the buffer layer, so that the subsequent assembly process of the heat management part, the buffer layer and the wall part is omitted, and the manufacturing efficiency of the battery box is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box, a battery device, an electrical device and a battery box injection mold. Background Art

[0002] During the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. Usually, a thermal management component can be installed in the battery box to exchange heat with the battery cells. There is usually a buffer layer between the thermal management component and the battery box body to absorb part of the impact energy when the battery device is hit, thereby improving the protection capability of the battery device.

[0003] However, the battery box body, thermal management components and buffer layer are usually independent parts that need to be assembled and fixed together as a whole through subsequent processes. Assembly tolerances and gaps need to be considered during assembly to reduce interference between independent parts during assembly, resulting in assembly difficulties. The assembly process is relatively complicated and the manufacturing efficiency of the battery box is low. Utility Model Content

[0004] The purpose of the present application is to provide a battery box, a battery device, an electrical device and a battery box injection mold to simplify the connection and assembly process of the battery box body, a buffer layer and thermal management components, thereby improving the manufacturing efficiency of the battery box.

[0005] To achieve the above-mentioned purpose, the first technical solution provided in the present application is: a battery box, comprising a box body, a thermal management component and a buffer layer; the box body has a storage space for accommodating battery cells, and the box body includes a wall portion; the thermal management component is located on the side of the wall portion facing the storage space, or on the side of the wall portion away from the storage space; the buffer layer is at least partially injection molded between the thermal management component and the wall portion, and the thermal management component and the wall portion are connected into an integrated structure through the buffer layer.

[0006] The beneficial effect of the battery box provided by the present application is that: by at least partially injection molding the buffer layer between the thermal management component and the wall portion, the thermal management component and the wall portion can be directly connected into an integrated structure through injection molding of the buffer layer, that is, the thermal management component, the buffer layer and the wall portion are integrated into an integral part, eliminating the need for subsequent assembly of the thermal management component, the buffer layer and the wall portion of the box body, thereby saving the time required to consider assembly tolerances and gaps during assembly, and improving the manufacturing efficiency of the battery box.

[0007] In some embodiments, the box body includes a bottom wall and multiple side walls, the multiple side walls are connected to the bottom wall and enclose a accommodating space, the bottom wall is used to support the battery cell, and the wall portion is the bottom wall; along the thickness direction of the bottom wall, the thermal management component is located on one side of the bottom wall, and the buffer layer is integrally injection molded between the bottom wall and the thermal management component.

[0008] In this embodiment, the bottom wall of the box is used as the wall portion, and the buffer layer is integrally injection molded between the bottom wall and the thermal management component. Therefore, the buffer layer can play a buffering role in the thickness direction of the bottom wall, thereby improving the protection effect on the bottom of the battery cell.

[0009] In some embodiments, the box body includes a bottom wall and multiple side walls, the multiple side walls are connected to the bottom wall and enclose a storage space, the bottom wall is used to support the battery cell, and along the thickness direction of the bottom wall, the thermal management component is located on the side of the bottom wall facing the storage space, and the wall portion is the bottom wall; wherein the buffer layer includes a first buffer portion and a second buffer portion, the first buffer portion is injection molded between the bottom wall and the thermal management component; the second buffer portion is injection molded on the side wall.

[0010] In this embodiment, the bottom wall of the box body is used as the wall portion, and a portion of the buffer layer is injection molded between the bottom wall and the thermal management component. This portion of the buffer layer can play a buffering and energy-absorbing role in the thickness direction of the bottom wall, thereby improving the protection capability for the bottom of the battery cell. Another portion of the buffer layer is injection molded on the side wall. This portion of the buffer layer can play a buffering and energy-absorbing role in the thickness direction of the side wall, thereby improving the protection capability for the side of the battery cell, and also reducing the risk of direct collision and electrical contact between the battery cell and the side wall.

[0011] Furthermore, in the present embodiment, the injection molding of the first buffer portion and the second buffer portion of the buffer layer only requires one set of injection molds, thereby saving one set of injection molds and simplifying the injection molding process.

[0012] In some embodiments, the first buffer portion and the second buffer portion are connected as one piece.

[0013] In this way, the first buffer part and the second buffer part can be injection molded at one time, and the injection molding process is simpler.

[0014] In some embodiments, the first buffer portion and the second buffer portion are disposed separately from each other.

[0015] In this way, the protective effect of the first buffer portion on the bottom of the battery cell and the protective effect of the second buffer portion on the side of the battery cell do not affect each other.

[0016] In some embodiments, along the thickness direction of the bottom wall, one end of the second buffer portion away from the thermal management component is located between one end of the side wall away from the thermal management component and the thermal management component, or one end of the second buffer portion away from the thermal management component is located flush with one end of the side wall away from the thermal management component.

[0017] In this embodiment, the height of the second buffer portion on the side wall is limited to not protrude from the side wall, which can reduce the risk of damage to the end of the second buffer portion away from the heat management component.

[0018] In some embodiments, at least one of the plurality of side walls is provided with an inlet and outlet water joint for communicating with the interior of the thermal management component, and the second buffer portion is formed on the side wall without the inlet and outlet water joint.

[0019] In this embodiment, the second buffer portion is formed on the side wall where no water inlet and outlet joints are provided, which can reduce the influence of the second buffer portion on the water inlet and outlet of the thermal management component.

[0020] In some embodiments, the thickness of the second buffer portion is 20 mm to 50 mm, and the thickness of the first buffer portion is 5 mm to 10 mm.

[0021] In this embodiment, the thickness of the second buffer part is limited to the range of 20mm~50mm, and the thickness of the first buffer part is limited to the range of 5mm~10mm, so that the thickness of the second buffer part is greater than the thickness of the first buffer part. This is because the thickness of the first buffer part is limited by the overall height of the battery box, and therefore the thickness of the first buffer part is usually set to be relatively small, while the thickness of the second buffer part is set to be slightly larger, which can provide better protection for the side surfaces of the battery cells.

[0022] In some embodiments, the first buffer portion and the second buffer portion are both full-surface continuous structures, and the first buffer portion covers the thermal management component in its entirety.

[0023] The first buffer part and the second buffer part are both continuous structures. The first buffer part and the second buffer part have better buffering effect and better protection for the battery device. The first buffer part covers the thermal management component on its entire surface, which can reduce the risk of contact and collision between the bottom wall of the box and the thermal management component.

[0024] In order to achieve the above-mentioned purpose, the second technical solution provided in the present application is: a battery device, including a battery cell and a battery box of any of the above solutions, wherein the battery cell is arranged in the accommodating space.

[0025] The beneficial effects of the battery device provided in the present application are the same as those of the battery box, and will not be repeated here.

[0026] In order to achieve the above-mentioned purpose, the third technical solution provided in the present application is: an electrical device, including the above-mentioned battery device, and the battery device is used to provide electrical energy to the electrical device.

[0027] The beneficial effects of the electrical device provided in the present application are the same as the beneficial effects of the battery box, and will not be repeated here.

[0028] To achieve the above-mentioned purpose, the fourth technical solution provided in the present application is: a battery box injection mold, the battery box injection mold includes an injection mold body, the injection mold body is formed with a accommodating cavity, the accommodating cavity is used to accommodate the thermal management component and the wall of the box body, so as to form a cavity at least between the thermal management component and the wall, and the cavity is used to receive injection molding raw materials to form a buffer layer, so as to obtain the thermal management component, wall and buffer layer connected into an integrated structure in the battery box.

[0029] The beneficial effect of the battery box injection mold provided in the present application is: the battery box injection mold provided in the embodiment of the present application is used to manufacture the thermal management components, wall portions and buffer layers connected into an integrated structure in the battery box of the above-mentioned embodiment, and the thermal management components and the wall portions of the box body are embedded in the accommodating cavity formed by the injection mold body of the battery box injection mold as embedded parts, so that a cavity is formed at least between the thermal management components and the wall portions, and the buffer layer is formed after the injection molding raw material is solidified by injecting injection molding raw materials into the cavity, and the thermal management components and the wall portions are connected into an integrated structure through the solidification molding of the buffer layer, thereby eliminating the need for subsequent assembly of the thermal management components, the buffer layer and the wall portions, thereby saving the time required to consider assembly tolerances and gaps during assembly, and improving the manufacturing efficiency of the battery box.

[0030] In some embodiments, the box body includes a bottom wall and multiple side walls, the multiple side walls are connected to the bottom wall and enclose a receiving space, the bottom wall is used to support the battery cell, and the wall portion is the bottom wall; wherein the cavity is sandwiched as a whole between the bottom wall and the thermal management component.

[0031] In this embodiment, the cavity is entirely sandwiched between the bottom wall and the thermal management component. Therefore, after the molding material is injected into the cavity, the molding material filled in the cavity is solidified to form a buffer layer that is entirely sandwiched between the bottom wall and the thermal management component. The buffer layer can play a buffering role in the thickness direction of the bottom wall, thereby enhancing the protective effect on the bottom of the battery cell.

[0032] In some embodiments, the box body includes a bottom wall and multiple side walls, the multiple side walls are connected to the bottom wall and enclose a accommodating space, the bottom wall is used to support the battery cell, and the wall portion is the bottom wall; wherein the cavity includes a first cavity portion and a second cavity portion, the first cavity portion is sandwiched between the bottom wall and the thermal management component in the thickness direction of the bottom wall; the second cavity portion is located between the first cavity portion and the side wall in the thickness direction of the side wall.

[0033] In this embodiment, the first cavity portion is sandwiched between the bottom wall and the thermal management component in the thickness direction of the bottom wall. Therefore, after the injection molding material is injected into the first cavity portion, the injection molding material filled in the first cavity portion is solidified to form a first buffer portion sandwiched between the bottom wall and the thermal management component. The first buffer portion can play a buffering role in the thickness direction of the bottom wall, thereby enhancing the protection capability of the bottom of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0035] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments provided by the present application;

[0036] Figure 2 is a schematic diagram of a three-dimensional structure of a battery box according to one or more embodiments provided in the present application;

[0037] Figure 3 yes Figure 2 An exploded view of the battery box;

[0038] Figure 4 yes Figure 2 A top view of a battery box;

[0039] Figure 5 yes Figure 4 AA cross-sectional view of the battery box;

[0040] Figure 6 yes Figure 5 The enlarged view of point B in the middle;

[0041] Figure 7 is a three-dimensional diagram of a battery box according to another embodiment provided by the present application;

[0042] Figure 8 yes Figure 7 A partial enlarged view of the cross-sectional structure;

[0043] Fig. 9 is an exploded view of a battery device according to one or more embodiments provided by the present application;

[0044] Fig.10 is a top view of a battery device according to one or more embodiments provided by the present application;

[0045] Fig.11 yes Fig.10 Middle CC cross section;

[0046] Fig.12 yes Fig.11 The enlarged view of point D in the middle;

[0047] Fig.13 is a schematic diagram of the three-dimensional structure of a battery box injection mold before mold closing according to one or more embodiments of the present application;

[0048] Fig.14 The thermal management components and the wall of the box are mounted to Fig.13 Schematic diagram of the three-dimensional structure of the battery box after injection molding;

[0049] Fig.15 The injection molding material is placed Fig.14 State diagram of the battery box inside the injection mold;

[0050] Fig.16 yes Fig.15 Schematic diagram of the three-dimensional structure of the battery box injection mold in the mold closing state;

[0051] Fig.17 yes Fig.16 Middle EE cross section;

[0052] Fig.18 yes Fig.17 The enlarged view of F in the middle;

[0053] Fig.19 yes Fig.18 Schematic diagram of the structure after removing the buffer layer;

[0054] Fig. 20 yes Fig.19 Schematic diagram after removing the thermal management components and the box;

[0055] Fig.21 yes Fig.16 A schematic diagram of the structure of the battery box injection mold in the mold opening state;

[0056] Fig. 22 is a partial enlarged view of the cross-sectional structure of a battery box injection mold at the cavity according to another embodiment provided by the present application;

[0057] Fig.23 yes Fig. 22 Schematic diagram of the structure after removing the thermal management components and the box.

[0058] Description of reference numerals:

[0059] Vehicle 1000; controller 200; motor 300; battery device 100; battery cell 10; battery box 20; accommodating space 201; box body 21; box body 21A; wall 210; bottom wall 211; side wall 212; management component 22; first plate 221; second plate 222; buffer layer 23; first buffer part 231; second buffer part 232; battery box injection mold 1; injection mold body 101; first mold 102; first fixed cavity 1020; insertion part 1021; docking part 1022; second mold 103; second fixed cavity 1030; cavity 104; first cavity part 1041; second cavity part 1042; accommodating cavity 105; injection molding material 2. DETAILED DESCRIPTION

[0060] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0062] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0063] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0065] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", "height direction", "first direction", and "second direction" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0068] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. In the related art, the battery device usually includes a battery box and a battery cell contained in the battery box. A thermal management component can usually be installed in the battery box for heat exchange with the battery cell. There is usually a buffer layer between the thermal management component and the battery box body to absorb part of the impact energy when the battery device is hit, thereby improving the protection capability of the battery device.

[0069] However, the battery box body, thermal management components and buffer layer need to be manufactured and formed into independent parts first, and then assembled into a whole through subsequent processes, and the connection and fixation between the thermal management components and the buffer layer, as well as between the buffer layer and the box body need to be achieved through a gluing process. Assembly tolerances and gaps need to be considered during assembly to reduce interference problems when assembling independent parts, resulting in assembly difficulties, complex assembly processes, and low manufacturing efficiency of the battery box.

[0070] In view of this, in order to simplify the connection and assembly process of the case, the buffer layer and the thermal management component and improve the manufacturing efficiency of the battery case, an embodiment of the present application provides a battery case, comprising a case, a thermal management component and a buffer layer; the case has a storage space for accommodating battery cells, and the case includes a wall portion; the thermal management component is located on the side of the wall portion facing the storage space, or on the side of the wall portion away from the storage space; the buffer layer is at least partially injection molded between the thermal management component and the wall portion, and the thermal management component and the wall portion are connected into an integrated structure through the buffer layer.

[0071] The battery box provided in the embodiment of the present application has a buffer layer that is at least partially injection molded between the thermal management component and the wall portion. The thermal management component and the wall portion can be connected into an integrated structure by injection molding of the buffer layer, that is, the thermal management component, the buffer layer and the wall portion are integrated into one part, eliminating the need for subsequent assembly steps of the thermal management component, the buffer layer and the wall portion, thereby saving time for considering assembly tolerances and gaps during assembly, simplifying the assembly process of the battery box, and improving the manufacturing efficiency of the battery box.

[0072] The battery device involved in the embodiments of the present application can be used in an electrical device that uses the battery device as a power source. The electrical device involved in the embodiments of the present application may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, a vehicle, a ship, a spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. According to the drive mode, the vehicle may be a front-wheel drive vehicle, a rear-wheel drive vehicle, or a four-wheel drive vehicle.

[0073] The electrical device includes a device body and a battery device as mentioned in the context. The device body is the main frame structure of the electrical device. For example, when the electrical device is a vehicle, the device body is the vehicle body. When the electrical device is a ship, the device body is the ship body.

[0074] In other embodiments, the battery device involved in the embodiments of the present application can also be used in an energy storage system that uses the battery device as an energy storage element. Among them, the energy storage system can include an energy storage container, an energy storage cabinet, etc.

[0075] For ease of description, the embodiments of the present application are described using an electrical device as a vehicle as an example.

[0076] See also Figure 1 , Figure 11 is a schematic diagram of the structure of a vehicle according to one or more embodiments provided by the present application. A controller 200, a motor 300 and a battery device 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery device 100 to power the motor 300. For example, a battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] The battery device 100 according to the embodiment of the present application refers to a single physical module including a plurality of battery cells to provide higher voltage and capacity.

[0078] The battery cell involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. The battery cell may be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after the battery cell is discharged and continue to be used. Each battery cell may also be a primary battery.

[0079] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the present embodiment. The battery cell can be cylindrical, flat, rectangular or other shapes.

[0080] This application provides a battery box, please refer to Figures 2 to 6 , Figure 2 is a schematic diagram of a three-dimensional structure of a battery box according to one or more embodiments provided in the present application, Figure 3 yes Figure 2 Exploded view of the battery box. Figure 4 yes Figure 2 A top view of the battery box. Figure 5 yes Figure 4 AA cross-section of the battery box, Figure 6 yes Figure 5The battery box 20 includes a box body 21, a thermal management component 22 and a buffer layer 23; the box body 21 has a storage space 201 for storing battery cells, and the box body 21 includes a wall 210; the thermal management component 22 is located on the side of the wall 210 facing the storage space 201, or on the side of the wall 210 away from the storage space 201; the buffer layer 23 is at least partially injection-molded between the thermal management component 22 and the wall 210, and the thermal management component 22 and the wall 210 are connected to form an integrated structure through the buffer layer 23.

[0081] The battery box 20 provided in the embodiment of the present application is used to encapsulate the battery cells, thereby protecting the battery cells and reducing the impact of liquid or other foreign matter on the charging or discharging of the battery cells.

[0082] The box 21 is a component for accommodating battery cells. Specifically, the battery cells are accommodated in the accommodating space 201 of the box 21. The box 21 can be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The material of the box 21 can be alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam plastics, or composite materials such as glass fiber and epoxy resin.

[0083] The wall portion 210 of the box body 21 means that the box body 21 can be a shell structure composed of multiple walls. For example, the multiple walls of the box body 21 can include a top wall, a bottom wall and multiple side walls. The wall portion 210 of the box body 21 can be the top wall, bottom wall or side wall of the box body 21.

[0084] The thermal management component 22 is used to perform heat exchange with the battery cell 10, thereby cooling the battery cell 10 and reducing the heat generated by the battery cell 10 during use of the battery device 100, thereby alleviating the problem of adverse effects on the performance and service life of the battery device 100 caused by excessive heat of the battery cell 10.

[0085] As an example, the thermal management component 22 contains a heat exchange medium, and the heat exchange medium flows to perform heat exchange with the plurality of battery cells 10. When the flow of the heat exchange medium is used to cool the battery cells 10, the thermal management component 22 may also be referred to as a cold plate or cooling plate, where the heat exchange medium may be a liquid such as water, and the thermal management component 22 may also be referred to as a liquid cooling plate or a water cooling plate.

[0086] In some embodiments, the thermal management component 22 may be located on the side of the wall 210 facing the accommodation space 201 , that is, the thermal management component 22 may be accommodated in the box 21 , and the thermal management component 22 is located between the battery cell 10 and the wall 210 of the box 21 .

[0087] In other embodiments, the thermal management component 22 may be located on the side of the wall 210 away from the accommodating space 201 , that is, the thermal management component 22 is located outside the box body 21 , and the thermal management component 22 is located on the side of the wall 210 of the box body 21 away from the battery cell 10 .

[0088] The above-mentioned buffer layer 23 is at least partially injection molded between the thermal management component 22 and the wall portion 210, which means that the buffer layer 23 can be integrally injection molded between the thermal management component 22 and the wall portion 210, that is, the buffer layer 23 is sandwiched between the thermal management component 22 and the wall portion 210 as a whole; the buffer layer 23 can also be only partially injection molded between the thermal management component 22 and the wall portion 210, that is, the buffer layer 23 is only partially sandwiched between the thermal management component 22 and the wall portion 210, and the other part of the buffer layer 23 is not sandwiched between the thermal management component 22 and the wall portion 210. Figures 2 to 6 It is shown that the buffer layer 23 is only partially injection molded between the thermal management component 22 and the wall portion 210 .

[0089] Among them, the injection molding of the buffer layer 23 means that when the battery box 20 is manufactured, the injection molding process is adopted, and the thermal management component 22 and the wall 210 of the box body 21 are pre-embedded in the first mold and the second mold of the injection mold respectively as embedded parts. After the first mold and the second mold are molded together, they are enclosed together to form a cavity, and liquid or semi-solid injection molding material is injected into the cavity. The shape and size of the cavity are the same as the buffer layer 23 to be formed. The liquid or semi-solid injection molding material fills the cavity and solidifies to form. After the injection molding material solidifies to form a buffer layer 23, the curing process of the buffer layer 23 realizes the close bonding between the buffer layer 23 and the thermal management component 22, as well as the close bonding between the buffer layer 23 and the wall 210 of the box body 21, thereby realizing that the thermal management component 22 and the wall 210 are connected as an integrated structure through the buffer layer 23.

[0090] In some embodiments, the buffer layer 23 may be made of foam materials such as foam plastics and foam rubber.

[0091] Specifically, in some embodiments, the buffer layer 23 may be made of but not limited to polyurethane (PU) foam material. The polyurethane foam material has good sealing performance, can prevent the penetration of solids, liquids, and gases such as water and corrosive gases, has high water resistance and corrosion resistance, long service life, and light weight, which can reduce the overall weight of the battery box 20, and thus reduce the overall weight of the battery device 100. It also has strong compressive strength and tensile strength, can withstand a certain external pressure, and the polyurethane foam material has a rich pore structure inside, which can absorb impact energy through its own elastic deformation, and has good buffering and protection effects.

[0092] In other embodiments, the buffer layer 23 may be made of but not limited to polypropylene (EPP) foam material. Polypropylene foam material has high strength and high toughness, and also has excellent thermal insulation performance, chemical corrosion resistance, and environmental protection and recyclability. It is widely used due to its light weight, high strength and excellent buffering performance. Applying polypropylene foam material to the buffer layer 23 of the battery device 100 can improve the protection capability of the battery device 100 and reduce the overall weight of the battery device 100.

[0093] In the related art, the thermal management component 22, the buffer layer 23 and the wall 210 of the box body 21 are first manufactured and formed separately, and then assembled into a whole. Since the thermal management component 22, the buffer layer 23 and the wall 210 are independent of each other, assembly tolerances and gaps need to be considered during assembly. Therefore, the assembly is difficult, time-consuming and labor-intensive, and the manufacturing efficiency of the battery box 20 is low.

[0094] The battery box 20 provided in the present application has a buffer layer 23 that is at least partially injection molded between the thermal management component 22 and the wall 210. The thermal management component 22 and the wall 210 can be directly connected into an integrated structure through injection molding of the buffer layer 23, that is, the thermal management component 22, the buffer layer 23 and the wall 210 are integrated into an integral part, eliminating the process of connecting and assembling the thermal management component 22, the buffer layer 23 and the wall 210, thereby saving time for considering assembly tolerances and gaps during assembly, and improving the manufacturing efficiency of the battery box 20.

[0095] Compared with the solution in the related art that the thermal management component 22, the buffer layer 23 and the wall 210 need to be subsequently assembled to connect an integral part, the battery box 20 provided in the present application realizes the connection between the thermal management component 22, the buffer layer 23 and the wall 210 after the buffer layer 23 is manufactured and formed. It can be regarded as combining the molding steps of the buffer layer 23 and the assembling steps of the thermal management component 22, the buffer layer 23 and the wall 210 into one. The assembly is completed when the buffer layer 23 is molded, so the manufacturing efficiency of the battery box 20 can be greatly improved.

[0096] In the related art, when the thermal management component 22, the buffer layer 23 and the wall 210 are assembled, it is necessary to use glue to achieve a fixed connection between the buffer layer 23 and the wall 210 of the box body 21, as well as a fixed connection between the thermal management component 22 and the buffer layer 23. However, the present application achieves the connection and fixation of the thermal management component 22, the buffer layer 23 and the wall 210 through injection molding of the buffer layer 23, which saves the gluing cost, and also saves the space occupied by the glue, thereby improving the space utilization rate in the battery box 20.

[0097] It should be noted that the wall portion 210 of the box body 21, the thermal management component 22 and the buffer layer 23 of the battery box 20 in the embodiment of the present application are an integrated structure. After the buffer layer 23 is injection molded, the wall portion 210 of the box body 21, the thermal management component 22 and the buffer layer 23 are actually not disassembled. Figure 3 The exploded view is only for more clearly showing the respective structures of the wall portion 210 of the box body 21, the thermal management component 22 and the buffer layer 23.

[0098] In some embodiments, refer again to Figures 2 to 6 The box body 21 includes a box body 21A, which is a hollow structure with one end open. The box body 21A forms the above-mentioned accommodation space 201. The battery monomer can be loaded into the accommodation space 201 through the opening of the box body 21A, so as to facilitate the installation of the battery monomer. The box body 21A can be in various shapes, such as a cylinder, a cuboid, etc.

[0099] In some embodiments, the box body 21 further includes a box cover (not shown in the figure), which covers the opening of the box body 21A to close the opening.

[0100] The box cover body can be a plate-like structure, and the box cover body covers the open side of the box body 21A to form a box body 21 with a storage space 201; the box cover body can also be a hollow structure with one side open, and the open side of the box cover body covers the open side of the box body 21A to form a box body 21 with a storage space 201. When the box body 21A and the box cover body are both hollow structures with one side open, the box cover body can also be called an upper box body, and the box body 21A can also be called a lower box body. The box body 21 formed by the box body 21A and the box cover body can be in various shapes, such as a cylinder, a cuboid, etc.

[0101] In this embodiment, the box body 21 includes a box body 21A and a box cover body. The battery cells can be loaded into the storage space 201 of the box body 21 through the opening of the box body 21A, and the box cover body covers the opening of the box body 21A, so as to improve the anti-interference ability of the battery cells in the storage space 201 and improve the protection ability of the battery cells.

[0102] It can be understood that after the buffer layer 23 is injection molded to form an integrated structure with the thermal management component 22, the buffer layer 23 and the box body 21, the battery cell needs to be subsequently loaded into the box body 21A of the box body 21. Therefore, during the injection molding of the buffer layer 23, the box body 21 actually only needs to embed the box body 21A and the thermal management component 22 as embedded parts into the injection mold to realize the injection molding of the buffer layer 23. After the battery cell is subsequently loaded into the box body 21A, the box cover body is closed on the opening of the box body 21A. Therefore, the above-mentioned integrated structure actually refers to the integrated structure formed by the box body 21A, the thermal management component 22 and the buffer layer 23.

[0103] Of course, the present application does not exclude the situation where the entire box body 21 having the box body 21A and the box cover body is embedded in the injection mold as a pre-embedded part to realize the injection molding of the buffer layer 23. For example, when the thermal management component 22 and the buffer layer 23 are located outside the box body 21, the entire structure of the box body 21 consisting of the box body 21A and the box cover body can be embedded in the mold as a pre-embedded part to realize the injection molding of the buffer layer 23, or only the box body 21A can be embedded in the mold as an embedded part to realize the injection molding of the buffer layer 23.

[0104] In some embodiments, see Figure 7 and Figure 8 , Figure 7 is a three-dimensional diagram of a battery box 20 according to another embodiment provided by the present application. Figure 8 yes Figure 7 A partial enlarged view of the cross-sectional structure shows that the box body 21 includes a bottom wall 211 and multiple side walls 212. The multiple side walls 212 are connected to the bottom wall 211 and enclose a accommodating space 201. The bottom wall 211 is used to carry battery cells, and the wall portion 210 is the bottom wall 211. Along the thickness direction of the bottom wall 211, the thermal management component 22 is located on one side of the bottom wall 211, and the buffer layer 23 is integrally injection molded between the bottom wall 211 and the thermal management component 22.

[0105] In this embodiment, the bottom wall 211 of the box body 21 is used as the wall portion 210, and the buffer layer 23 is integrally injection molded between the bottom wall 211 and the thermal management component 22. Therefore, the buffer layer 23 can play a buffering role in the thickness direction of the bottom wall 211, thereby enhancing the protection effect on the bottom of the battery cell.

[0106] The heat management component 22 may be located on the side of the bottom wall 211 facing the accommodation space 201 , or may be located on the side of the bottom wall 211 facing away from the accommodation space 201 . Figure 7 and Figure 8 The heat management component 22 is shown as being located on the side of the bottom wall 211 facing the accommodation space 201 .

[0107] In some embodiments, refer again to Figures 2 to 6 The box body 21 includes a bottom wall 211 and a plurality of side walls 212. The plurality of side walls 212 are connected to the bottom wall 211 and enclose a receiving space 201. The bottom wall 211 is used to carry the battery cells. Along the thickness direction of the bottom wall 211, the thermal management component 22 is located on a side of the bottom wall 211 facing the receiving space 201. The wall portion 210 is the bottom wall 211.

[0108] The buffer layer 23 includes a first buffer portion 231 and a second buffer portion 232 . The first buffer portion 231 is injection molded between the bottom wall 211 and the thermal management component 22 , and the second buffer portion 232 is injection molded on the side wall 212 .

[0109] In this embodiment, the bottom wall 211 of the box body 21 is used as the wall portion 210, and a portion of the buffer layer 23 is injection molded between the bottom wall 211 and the thermal management component 22. This portion of the buffer layer 23 can play a buffering and energy-absorbing role in the thickness direction of the bottom wall 211, thereby improving the protection capability for the bottom of the battery cell. Another portion of the buffer layer 23 is injection molded on the side wall 212. This portion of the buffer layer 23 can play a buffering and energy-absorbing role in the thickness direction of the side wall 212, thereby improving the protection capability for the side of the battery cell, and also reducing the risk of direct collision and electrical contact between the battery cell and the side wall 212.

[0110] Moreover, in the related art, the thermal management component 22, the first buffer part 231, the second buffer part 232 and the wall 210 of the box body 21 are four independent components, and these four parts are first manufactured and molded separately and then assembled. Therefore, the injection molding of the first buffer part 231 and the second buffer part 232 requires each to use a set of corresponding injection molds, and the injection molding cost is relatively high.

[0111] In this embodiment, the injection molding of the first buffer portion 231 and the second buffer portion 232 of the buffer layer 23 only requires one set of injection molds, thereby saving one set of injection molds and simplifying the injection molding process.

[0112] Specifically, a portion of the cavity in the injection mold corresponds to the shape of the first buffer portion 231, and another portion of the cavity corresponds to the shape of the second buffer portion 232. During injection molding, the injection molding material is injected into the cavity of the injection mold, and the first buffer portion 231 and the second buffer portion 232 are formed after the injection molding material in the cavity is solidified.

[0113] In some embodiments, continue to refer to Figures 2 to 6 , the first buffer part 231 and the second buffer part 232 are connected as one body. In this way, the first buffer part 231 and the second buffer part 232 can be injection molded at one time, and the injection molding process is simpler.

[0114] Specifically, during injection molding, the cavity in the injection mold used to form the first buffer part 231 is connected to the cavity for forming the second buffer part 232. As an example, the cavity in the injection mold used to form the first buffer part 231 is the first cavity part, and the cavity in the injection mold used to form the second buffer part 232 is the second cavity part. The first cavity part and the second cavity part are connected to form a large cavity, and injection molding material is injected into the large cavity. The injection molding material fills the first cavity part and the second cavity part. After the injection molding material is solidified, a structure in which the first buffer part 231 and the second buffer part 232 are connected as one body can be formed.

[0115] In some embodiments, the first buffer portion 231 and the second buffer portion 232 are disposed separately from each other, so that the first buffer portion 231 protects the bottom of the battery cell and the second buffer portion 232 protects the side of the battery cell independently of each other.

[0116] Specifically, during injection molding, the cavity in the injection mold for molding the first buffer part 231 and the cavity in the injection mold for molding the second buffer part 232 can be separated from each other. As an example, the cavity in the injection mold for molding the first buffer part 231 is the first cavity part, and the cavity in the injection mold for molding the second buffer part 232 is the second cavity part. The first cavity part and the second cavity part are separated from each other. Injection molding material is injected into the first cavity part. After the injection molding material in the first cavity part is solidified, the first buffer part 231 can be formed. Injection molding material is injected into the second cavity part. After the injection molding material in the second cavity is solidified, the second buffer part 232 can be formed. Since the first cavity part and the second cavity part are separated from each other, the first buffer part 231 and the second buffer part 232 are also separated from each other.

[0117] It should be noted that when the first buffer part 231 and the second buffer part 232 are arranged separately from each other, the injection molding of the first buffer part 231 and the injection molding of the second buffer part 232 can use the same set of molds. Of course, the present application does not exclude the situation where the injection molding of the first buffer part 231 and the injection molding of the second buffer part 232 are injection molded separately using two sets of molds.

[0118] In some embodiments, along the thickness direction of the bottom wall 211, one end of the second buffer portion 232 away from the thermal management component 22 is located between one end of the side wall 212 away from the thermal management component 22 and the thermal management component 22, or one end of the second buffer portion 232 away from the thermal management component 22 is flush with one end of the side wall 212 away from the thermal management component 22.

[0119] In this embodiment, the height of the second buffer portion 232 on the side wall 212 is limited to not protrude above the top of the side wall 212 , which can reduce the risk of damage to the end of the second buffer portion 232 away from the heat management component 22 .

[0120] Specifically, after the battery cell 10 is loaded into the box body 21A, the box cover body needs to cover the opening of the box body 21A, that is, the box cover body needs to be connected and fixed to the end of each side wall 212 away from the bottom wall 211 by fasteners such as bolts. When the box cover body is installed, the end of the second buffer part 232 away from the thermal management component 22 may be damaged. In this embodiment, the end of the second buffer part 232 away from the thermal management component 22 is arranged not to protrude from the side wall 212, which can reduce the risk of damage to the end of the second buffer part 232 away from the thermal management component 22. Figure 6 It is shown that along the thickness direction of the bottom wall 211 , one end of the second buffer portion 232 away from the heat management component 22 is located between one end of the side wall 212 away from the heat management component 22 and the heat management component 22 .

[0121] Of course, the present application does not exclude the situation where one end of the second buffer portion 232 away from the thermal management component 22 protrudes out of the other end of the side wall 212 away from the thermal management component 22. However, in this case, the box cover body needs to adopt a hollow structure with one side open. When the box cover body is installed to the end of each side wall 212 away from the bottom wall 211, the box cover body accommodates the part of the second buffer portion 232 protruding from the side wall 212.

[0122] In some embodiments, at least one of the plurality of side walls 212 is provided with an inlet and outlet water joint (not shown) for connecting to the interior of the thermal management component 22, and the second buffer portion 232 is formed on the side wall 212 without the inlet and outlet water joint.

[0123] In this embodiment, the second buffer portion 232 is formed on the side wall 212 where no water inlet and outlet joints are provided, which can reduce the interference of the second buffer portion 232 on the water inlet and outlet of the thermal management component 22 .

[0124] Furthermore, generally speaking, the side wall 212 provided with the water inlet and outlet joints may also be provided with functional components such as high and low pressure joints, so the second buffer portion 232 should be avoided as much as possible on the side wall 212 provided with the water inlet and outlet joints.

[0125] In some embodiments, the thermal management component 22 includes a first plate 221 and a second plate 222, which are fixed together and enclosed to form a heat exchange channel, and the heat exchange channel is used for the heat exchange medium to flow through, so as to achieve heat exchange between the thermal management component 22 and the battery cells inside the box 21. The inlet and outlet water joints on the side wall 212 are respectively connected to the two ends of the heat exchange channel to achieve the flow of the heat exchange medium. The inlet and outlet water joints generally include an inlet joint and an outlet joint, the inlet joint is connected to the water inlet end of the heat exchange channel, and the outlet joint is connected to the water outlet end of the heat exchange channel.

[0126] Exemplarily, the box body 21 has four side walls 212. In some embodiments, one of the side walls 212 is provided with an inlet and outlet water joint for connecting the inside of the thermal management component, and the other three side walls 212 are not provided with inlet and outlet water joints, and at least one of the three side walls 212 without inlet and outlet water joints is injection molded with a second buffer portion 232. In other embodiments, two of the four side walls 212 that are opposite to each other are respectively provided with an inlet joint and an outlet joint, and at least one of the other two of the four side walls 212 that are opposite to each other is injection molded with a second buffer portion 232.

[0127] Figures 2 to 4 The second buffer portion 232 is shown as being injection-molded on two opposite side walls 212 where no water inlet and outlet joints are provided.

[0128] In some embodiments, the thickness of the second buffer portion 232 is 20 mm to 50 mm, and the thickness of the first buffer portion 231 is 5 mm to 10 mm.

[0129] In this embodiment, the thickness of the second buffer part 232 is limited to the range of 20 mm to 50 mm, and the thickness of the first buffer part 231 is limited to the range of 5 mm to 10 mm, so that the thickness of the second buffer part 232 is greater than the thickness of the first buffer part 231. This is because the thickness of the first buffer part 231 is limited by the overall height of the battery box 20. Therefore, the thickness of the first buffer part 231 is usually set to be relatively small, and the thickness of the second buffer part 232 is set to be slightly larger, which can provide better protection for the side of the battery cell.

[0130] Exemplarily, the thickness of the second buffer portion is 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm or 50 mm, and the thickness of the first buffer portion is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0131] Furthermore, the thickness of the second buffer part is 20 mm to 40 mm, and the thickness of the first buffer part is preferably 6 mm to 9 mm.

[0132] Furthermore, the thickness of the second buffer part is preferably 25 mm to 35 mm, and the thickness of the first buffer part is preferably 7 mm to 8 mm.

[0133] In some embodiments, the first buffer portion 231 and the second buffer portion 232 are both entire-surface continuous structures, and the first buffer portion 231 entirely covers the thermal management component 22 .

[0134] In this embodiment, the first buffer portion 231 and the second buffer portion 232 are both continuous structures on the entire surface, and the first buffer portion 231 and the second buffer portion 232 have better buffering effects and better protection capabilities for battery cells. The first buffer portion 231 covers the thermal management component 22 on the entire surface, which can reduce the risk of contact and collision between the bottom wall 211 of the box body 21 and the thermal management component 22. Of course, it is not necessary for the first buffer portion 231 and the second buffer portion 232 to be continuous structures on the entire surface, and for the first buffer portion 231 to cover the thermal management component 22 on the entire surface. As long as the first buffer portion 231 can separate the bottom wall 211 of the box body 21 from the thermal management component 22, in other embodiments, it is not excluded that the first buffer portion 231 and the second buffer portion 232 adopt a solution of partially hollowing out or hollowing out on the entire surface, and the solution that the first buffer portion 231 does not cover the thermal management component 22 on the entire surface.

[0135] The shape of the first buffer portion 231 can be designed to match the shape of the thermal management component 22, so that the first buffer portion 231 can play a better role in isolating the thermal management component 22 from the bottom wall 211. However, it should be noted that after the thermal management component 22 is fixed to the bottom wall 211 through the first buffer portion 231 of the buffer layer 23, a certain distance is required between the edge of the thermal management component 22 and the side wall 212 of the box body 21, so as to avoid contact between the thermal management component 22 and the side wall 212 of the box body 21 as much as possible, so as to reduce the risk of electrical contact between the battery cells through the thermal management component 22 and the box body 21.

[0136] The present application also provides a battery device. Fig. 9 and Fig.10 , Fig. 9 is an exploded view of a battery device according to one or more embodiments provided in the present application, Fig.10 1 is a top view of a battery device according to one or more embodiments provided in the present application. The battery device 100 may include a battery box 20 and a battery cell 10. The battery cell 10 is accommodated in an accommodation space 201 of the battery box 20. The introduction of the battery box 20 can be referred to the above description and will not be repeated here.

[0137] In the battery device 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. Multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the battery box 20. It is also possible that all battery cells 10 are directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all battery cells 10 is accommodated in the battery box 20. In some embodiments, the battery device 100 may also include a busbar, and multiple battery cells 10 may be electrically connected through the busbar to achieve the series connection, parallel connection, or mixed connection of multiple battery cells 10. The busbar may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0138] In some embodiments, see Fig.11 and Fig.12 , Fig.11 yes Fig.10 Middle CC cross section, Fig.12 yes Fig.11 In the enlarged view at D in the middle, the battery cells 10 and the second buffer portion 232 are spaced apart along the thickness direction of the side wall 212. In this way, it is convenient to assemble multiple battery cells 10 into the battery box 20.

[0139] In some embodiments, along the thickness direction of the side wall 212 (ie, Fig.12 In the X direction of the image, the distance between the battery cell 10 and the second buffer portion 232 is 5 mm to 40 mm. For example, the distance between the battery cell 10 and the second buffer portion 232 is 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm or 40 mm.

[0140] It can be understood that the larger the distance between the battery cell 10 and the second buffer part 232, the easier it is to assemble the battery cell 10 into the battery box 20, but the lower the battery energy density; the smaller the distance between the battery cell 10 and the second buffer part 232, the more difficult it is to assemble the battery cell 10 into the battery box 20, but the higher the battery energy density.

[0141] This embodiment limits the distance between the battery cell 10 and the second buffer portion 232 to within the range of 5 mm to 40 mm, which not only facilitates the assembly of multiple battery cells 10 into the battery box 20, but also improves the space utilization rate in the battery box 20, thereby increasing the battery energy density.

[0142] In some embodiments, when the buffer layer 23 includes a first buffer portion 231 and a second buffer portion 232, the distance between the battery cell 10 and the second buffer portion 232 is 10 mm to 20 mm along the thickness direction of the side wall 212. Limiting the distance between the battery cell 10 and the second buffer portion 232 to a more optimal range of 10 mm to 20 mm can achieve a higher battery energy density while making it less difficult to assemble multiple battery cells 10 into the battery box 20.

[0143] The present application also provides an electric device, which includes the battery device 100, and the battery device 100 is used to provide electric energy for the electric device. The introduction of the electric device can be referred to the above records, and will not be repeated here.

[0144] The present application also provides a battery box injection mold, see Fig.13 , Fig.13 is a schematic diagram of the three-dimensional structure of a battery box injection mold before mold closing according to one or more embodiments of the present application, Fig.14 The heat management component 22 and the wall 210 of the box body 21 are installed to Fig.13 Schematic diagram of the three-dimensional structure of the battery box after injection molding, wherein: Fig.13 (a) and (b) show the exploded structural stereograms of the battery box injection mold at different viewing angles before mold closing. Fig.14 (a) and (b) show exploded structural stereograms at different viewing angles after the thermal management component 22 and the wall portion 210 of the box body 21 are installed in the battery box injection mold before mold closing.

[0145] The battery box injection mold 1 includes an injection mold body 101, which is formed with a accommodating cavity. The accommodating cavity is used to accommodate the thermal management component 22 and the wall 210 of the box body 21, so as to form a cavity at least between the thermal management component 22 and the wall 210, and the cavity is used to receive injection molding materials to form a buffer layer 23, so as to obtain the thermal management component 22, wall 210 and buffer layer 23 connected into an integrated structure in the battery box 20 of the above embodiment.

[0146] See also Figures 15 to 21 , Fig.15 The injection molding material is placed Fig.14 State diagram of the battery box injection mold 1, Fig.16 yes Fig.15 A schematic diagram of the three-dimensional structure of the battery box injection mold 1 in the mold closing state, Fig.17 yes Fig.16 Middle EE cross section, Fig.18 yes Fig.17 The enlarged image of F in the middle. Fig.19 yes Fig.18 The schematic diagram of the structure after removing the buffer layer 23, Fig.191 shows a schematic structural diagram of the cavity 104, Fig. 20 yes Fig.19 Schematic diagram after removing the thermal management component 22 and the box body 21, Fig. 20 shows a schematic structural diagram of the accommodating cavity 105, Fig.21 yes Fig.16 A schematic structural diagram of a battery box injection mold 1 in an open mold state.

[0147] Generally speaking, the injection mold body 101 may include a first mold 102 and a second mold 103, and the thermal management component 22 and the wall portion 210 of the box body 21 are respectively fixed to the first mold 102 and the second mold 103 as embedded parts, and the first mold 102 and the second mold 103 are closed to form a cavity 104 at least between the thermal management component 22 and the wall portion 210. Therefore, the meaning of the cavity 104 involved in the embodiment of the present application refers to the closed cavity for filling the injection molding material formed inside the mold when the first mold 102 with the thermal management component 22 embedded and the second mold 103 with the box body 21 embedded are closed.

[0148] In some embodiments, the thermal management component 22 can be fixed to the first mold 102 in a tightly fitting manner, and the fixation between the thermal management component 22 and the first mold 102 is achieved by the static friction and extrusion between the thermal management component 22 and the first mold 102; similarly, the wall 210 of the box body 21 can be fixed to the second mold 103 in a tightly fitting manner, and the fixation between the two is achieved by the static friction and extrusion between the box body 21 and the second mold 103. In other embodiments, the thermal management component 22 and the wall 210 of the box body 21 can be fixed to the first mold 102 and the second mold 103 respectively by, but not limited to, magnetic attraction or vacuum adsorption.

[0149] Specifically, a first fixing cavity 1020 may be provided on one side of the first mold 102 facing the second mold 103, and the thermal management component 22 is tightly embedded in the first fixing cavity 1020, so that the thermal management component 22 is fixed to the first mold 102. The shape of the first fixing cavity 1020 may be designed to match the overall shape of the thermal management component 22, so as to increase the degree of fastening of the thermal management component 22 in the first fixing cavity 1020.

[0150] A second fixing cavity 1030 may be provided on one side of the second mold 103 facing the first mold 102, and the box body 21 is tightly embedded in the second fixing cavity 1030, so that the wall portion 210 of the box body 21 is fixed to the second mold 103. The shape of the second fixing cavity 1030 may be designed to match the overall shape of the box body 21, so as to increase the degree of fastening of the box body 21 in the second fixing cavity 1030.

[0151] The above-mentioned accommodating cavity 105 is composed of a cavity body enclosed by the first fixed cavity 1020 and the second fixed cavity 1030 after the mold is closed, that is, Fig. 20 The actual space of the middle accommodating cavity 105 is Fig.19 The sum of the space occupied by the heat management component 22 , the space occupied by the cavity 104 and the space occupied by the box body 21 .

[0152] After the thermal management component 22 is embedded in the first mold 102 and the wall portion 210 of the box body 21 is embedded in the second mold 103, the first mold 102 and the second mold 103 are molded together to enclose the above-mentioned cavity 104. The specific structure of the cavity 104 can be seen in Fig.19 The mold cavity 104 is filled with the injection molding material 2, and after the injection molding material 2 solidifies and forms, the mold cavity 104 is formed. Fig.18 The buffer layer 23 is shown in FIG.

[0153] The injection molding material 2 may be liquid or semi-solid, and may be, but not limited to, polyurethane foam material, polypropylene foam material, etc. The liquid or semi-solid injection molding material 2 filled in the mold cavity 104 solidifies into a solid state to form a buffer layer 23 .

[0154] In the battery box injection mold 1 provided in the embodiment of the present application, there are also various ways to inject the injection molding material 2 into the cavity 104. After the thermal management component 22 and the wall portion 210 of the box body 21 are respectively fixed to the first mold 102 and the second mold 103 as embedded parts, the first mold 102 and the second mold 103 can be first molded together, and then the liquid or semi-solid injection molding material 2 is injected into the cavity 104, so that the injection molding material 2 fills the cavity 104; the injection molding material 2 can also be placed in the accommodating space 201 of the box body 21, that is, placed on the wall portion 210 ( Fig.15 As shown), the first mold 102 and the second mold 103 are then closed together, and the injection molding material 2 placed on the wall 210 of the box body 21 automatically fills the mold cavity 104 through the closing process. Figures 14 to 18 This type of injection of the injection molding material 2 is shown.

[0155] by Figures 13 to 21 The injection molding process of the battery box injection mold 1 provided in the embodiment of the present application is roughly described as follows:

[0156] First, the heat management component 22 and the wall portion 210 of the box body 21 are fixed to the first mold 102 and the second mold 103 as embedded parts respectively ( Fig.14 Then the injection molding material 2 is placed on the wall 210 of the box 21 ( Fig.15 Then the first mold 102 and the second mold 103 are molded together ( Figures 16 to 182 shows the mold closing state of the first mold 102 and the second mold 103), the injection molding material 2 placed on the wall 210 of the box body 21 automatically fills the mold cavity 104; after the injection molding material 2 in the mold cavity 104 is solidified and formed, the thermal management component 22 and the wall 210 are connected to form an integrated structure through the buffer layer 23, and the first mold 102 and the second mold 103 are opened again ( Fig.21 The figure shows the open mold state of the first mold 102 and the second mold 103), the first mold 102 is separated from the thermal management component 22, the wall portion 210 and the buffer layer 23 connected to form an integrated structure, and finally the thermal management component 22, the wall portion 210 and the buffer layer 23 connected to form an integrated structure are taken out from the second mold 103.

[0157] It can be seen that the battery box injection mold 1 provided in the embodiment of the present application is used to manufacture the thermal management component 22, wall portion 210 and buffer layer 23 connected into an integrated structure in the battery box 20 of the above-mentioned embodiment. The thermal management component 22 and the wall portion 210 of the box body 21 are embedded in the accommodating cavity 105 formed by the injection mold body 101 of the battery box injection mold 1 as embedded parts, so that at least a cavity 104 is formed between the thermal management component 22 and the wall portion 210, and the injection molding material 2 is filled into the cavity 104. After the injection molding material 2 is solidified, the buffer layer 23 is formed. The thermal management component 22 and the wall portion 210 are connected into an integrated structure through the solidification molding of the buffer layer 23, which eliminates the need for subsequent assembly of the thermal management component 22, the buffer layer 23 and the wall portion 210, thereby saving time for considering assembly tolerances and gaps during assembly, and improving the manufacturing efficiency of the battery box 20.

[0158] Compared with the solution in the related art that the thermal management component 22, the buffer layer 23 and the wall 210 need to be subsequently assembled to connect an integral part, the battery box 20 manufactured by the battery box injection mold 1 provided in the embodiment of the present application can realize the connection between the thermal management component 22, the buffer layer 23 and the wall 210 after the buffer layer 23 is manufactured and formed. It can be regarded as combining the molding steps of the buffer layer 23 and the assembling steps of the thermal management component 22, the buffer layer 23 and the wall 210 into one. The assembly is completed when the buffer layer 23 is molded, so the manufacturing efficiency of the battery box 20 can be greatly improved.

[0159] In some embodiments, see Fig. 22 and Fig.23 , Fig. 22 is a partial enlarged view of the cross-sectional structure of the battery box injection mold 1 at the cavity 104 according to another embodiment provided by the present application, Fig.23 yes Fig. 22 The schematic diagram of the structure after removing the thermal management component 22 and the box body 21, Fig.23A schematic structural diagram of the accommodating chamber 105 is shown.

[0160] The box body 21 includes a bottom wall 211 and a plurality of side walls 212 . The plurality of side walls 212 are connected to the bottom wall 211 and enclose the aforementioned accommodation space 201 . The bottom wall 211 is used to carry the battery cells, and the wall portion 210 is the bottom wall 211 .

[0161] The cavity 104 is entirely sandwiched between the thermal management component 22 and the bottom wall 211 of the box body 21 .

[0162] The battery box injection mold 1 of this embodiment is used to manufacture Figure 7 and Figure 8 The illustrated structure is an integrated structure formed by the wall portion 210 of the box body 21 , the buffer layer 23 and the heat management component 22 .

[0163] In this embodiment, the cavity 104 is integrally sandwiched between the bottom wall 211 and the thermal management component 22. Therefore, after the injection molding material 2 is injected into the cavity 104, the injection molding material 2 filled in the cavity 104 is solidified to form a buffer layer 23 integrally sandwiched between the bottom wall 211 and the thermal management component 22. The buffer layer 23 can play a buffering role in the thickness direction of the bottom wall 211, thereby enhancing the protective effect on the bottom of the battery cell.

[0164] In some embodiments, continue to refer to Fig.13 and Fig. 22 The first mold 102 includes an insertion portion 1021 and a docking portion 1022, the insertion portion 1021 is located radially inward of the docking portion 1022, and the insertion portion 1021 protrudes from the docking portion 1022, and the first fixed cavity 1020 is arranged on the side of the insertion portion 1021 facing the second fixed cavity 1030 in the thickness direction of the bottom wall 211.

[0165] When the first mold 102 and the second mold 103 are molded together, the insert portion 1021 is inserted into the accommodating space 201 of the box body 21 fixed in the second fixed cavity 1030 to form a cavity 104 between the thermal management component 22 and the bottom wall 211 along the thickness direction of the bottom wall 211. The insert portion 1021 is in contact with the side wall 212 on one side facing the side wall 212 in the thickness direction of the side wall 212, and the docking portion 1022 is in contact with the radially outer portion of the second mold 103 in the second fixed cavity 1030, so that after the first mold 102 and the second mold 103 are molded together, the cavity 104 is formed only between the bottom wall 211 and the thermal management component 22 along the thickness direction of the bottom wall 211.

[0166] In some embodiments, refer again to Figures 14 to 21The box body 21 includes a bottom wall 211 and a plurality of side walls 212 . The plurality of side walls 212 are connected to the bottom wall 211 and enclose the above-mentioned accommodation space 201 . The bottom wall 211 is used to carry the battery cells, and the wall portion 210 is the bottom wall 211 .

[0167] The cavity 104 includes a first cavity portion 1041 and a second cavity portion 1042. The first cavity portion 1041 is sandwiched between the bottom wall 211 and the thermal management component 22 in the thickness direction of the bottom wall 211, and the second cavity portion 1042 is located between the side wall 212 and the first cavity portion 1041 in the thickness direction of the side wall 212.

[0168] The battery box injection mold 1 of this embodiment is used to manufacture Figures 2 to 6 The illustrated structure is an integrated structure formed by the wall portion 210 of the box body 21 , the buffer layer 23 and the heat management component 22 .

[0169] In this embodiment, the first cavity portion 1041 is sandwiched between the bottom wall 211 and the thermal management component 22 in the thickness direction of the bottom wall 211. Therefore, after the injection molding material 2 is injected into the first cavity portion 1041, the injection molding material 2 filled in the first cavity portion 1041 is solidified to form a first buffer portion 231 sandwiched between the bottom wall 211 and the thermal management component 22. The first buffer portion 231 can play a buffering role in the thickness direction of the bottom wall 211, thereby enhancing the protection capability of the bottom of the battery cell.

[0170] The second cavity portion 1042 is located between the side wall 212 and the first cavity portion 1041 in the thickness direction of the side wall 212. Therefore, after the injection molding material 2 is injected into the second cavity portion 1042, the injection molding material 2 filled in the second cavity portion 1042 is solidified to form a second buffer portion 232. The second buffer portion 232 can protect the battery cell in the thickness direction of the side wall 212, that is, enhance the protection capability of the side of the battery cell, and can also reduce the risk of direct collision and electrical contact between the battery cell and the side wall 212.

[0171] Moreover, the first buffer part 231 and the second buffer part 232 are both injection molded by the battery box injection mold 1 of this embodiment, that is, the injection molding of the first buffer part 231 and the second buffer part 232 only requires one set of molds, which can save injection molds and injection molding processes.

[0172] In some embodiments, continue to refer to Fig.13 as well as Fig.19The first mold 102 includes an insertion portion 1021 and a docking portion 1022, the insertion portion 1021 is located radially inward of the docking portion 1022, and the insertion portion 1021 protrudes from the docking portion 1022, and the first fixed cavity 1020 is arranged on the side of the insertion portion 1021 facing the second fixed cavity 1030 in the thickness direction of the bottom wall 211.

[0173] When the first mold 102 and the second mold 103 are molded together, the inserting portion 1021 is inserted into the accommodating space 201 of the box body 21 fixed in the second fixed cavity 1030 to form the first cavity portion 1041 of the cavity 104 between the thermal management component 22 and the bottom wall 211 along the thickness direction of the bottom wall 211. The inserting portion 1021 is spaced apart from the side wall 212 in the thickness direction of the side wall 212 to form the second cavity portion 1042 of the cavity 104. And the docking portion 1022 is in contact with the radially outer portion of the second mold 103 of the second fixed cavity 1030, so that after the first mold 102 and the second mold 103 are molded together, the first cavity portion 1041 and the second cavity portion 1042 of the cavity 104 are formed.

[0174] In some embodiments, the first cavity portion 1041 and the second cavity portion 1042 are connected to each other or are separated from each other.

[0175] When the first cavity portion 1041 and the second cavity portion 1042 are connected, during injection molding, the injected injection molding material 2 can simultaneously fill the first cavity portion 1041 and the second cavity portion 1042 to simplify the injection molding process.

[0176] When the first cavity portion 1041 and the second cavity portion 1042 are separated from each other, the first buffer portion 231 molded by the injection molding material 2 filled in the first cavity portion 1041 and the second buffer portion 232 molded by the injection molding material 2 filled in the second cavity portion 1042 are also separated from each other, and the protective effect of the first buffer portion 231 on the bottom of the battery cell and the protective effect of the second buffer portion 232 on the side of the battery cell do not affect each other.

[0177] It should be noted that when the first cavity portion 1041 and the second cavity portion 1042 are separated from each other, the process of molding the first buffer portion 231 in the first cavity portion 1041 and the process of molding the second buffer portion 232 in the second cavity portion 1042 can be performed simultaneously or separately. Specifically, after the first mold 102 and the second mold 103 are molded together, the injection molding material 2 can be filled into the first cavity part 1041 and the second cavity part 1042 respectively, so that the first cavity part 1041 can form the first buffer part 231, and the second cavity part 1042 can form the second buffer part 232; or after the first mold 102 and the second mold 103 are molded together, the injection molding material 2 can be first filled into the first cavity part 1041, so that the first cavity part 1041 can form the first buffer part 231, and after the first mold 102 and the second mold 103 are opened, the injection molding material 2 can be filled into the second cavity part 1042 to form the second buffer part 232.

[0178] In the description of the present application, the description with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0179] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A battery box, characterized in that: include: A box body having a receiving space for receiving a battery cell, the box body comprising a wall portion; a heat management component, located on a side of the wall portion facing the accommodating space, or located on a side of the wall portion facing away from the accommodating space; A buffer layer, wherein at least a portion of the buffer layer is injection-molded between the thermal management component and the wall portion, and the thermal management component and the wall portion are connected to form an integral structure through the buffer layer.

2. The battery box according to claim 1, characterized in that: The box body includes a bottom wall and a plurality of side walls, the plurality of side walls are connected to the bottom wall and enclose the accommodation space, the bottom wall is used to carry the battery monomer, and the wall portion is the bottom wall; Along the thickness direction of the bottom wall, the heat management component is located at one side of the bottom wall, and the buffer layer is integrally injection-molded between the bottom wall and the heat management component.

3. The battery box according to claim 1, characterized in that: The box body includes a bottom wall and a plurality of side walls, the plurality of side walls are connected to the bottom wall and enclose the accommodation space, the bottom wall is used to carry the battery cells, and along the thickness direction of the bottom wall, the thermal management component is located on a side of the bottom wall facing the accommodation space, and the wall portion is the bottom wall; Wherein, the buffer layer comprises: a first buffer portion, the first buffer portion being injection molded between the bottom wall and the thermal management component; A second buffer portion, wherein the second buffer portion is injection molded on the side wall.

4. The battery box according to claim 3, characterized in that: The first buffer portion and the second buffer portion are connected as one body.

5. The battery box according to claim 3, characterized in that: The first buffer portion and the second buffer portion are disposed separately from each other.

6. The battery box according to claim 3, characterized in that: Along the thickness direction of the bottom wall, one end of the second buffer portion away from the thermal management component is located between one end of the side wall away from the thermal management component and the thermal management component, or one end of the second buffer portion away from the thermal management component is flush with one end of the side wall away from the thermal management component.

7. The battery box according to claim 3, characterized in that: At least one of the plurality of side walls is provided with an inlet and outlet water joint for communicating with the interior of the thermal management component, and the second buffer portion is formed on the side wall where the inlet and outlet water joint is not provided.

8. The battery box according to claim 3, characterized in that: The thickness of the second buffer part is 20 mm to 50 mm, and the thickness of the first buffer part is 5 mm to 10 mm.

9. The battery box according to claim 3, characterized in that: The first buffer portion and the second buffer portion are both full-surface continuous structures, and the first buffer portion covers the thermal management component in its entirety.

10. A battery device, characterized in that: include: The battery box according to any one of claims 1 to 9; The battery cell is arranged in the accommodation space.

11. An electrical device, characterized in that: The battery device comprises the battery device as claimed in claim 10, wherein the battery device is used to provide electrical energy to the electrical device.

12. A battery box injection mold, characterized in that: The battery box injection mold includes an injection mold body, which is formed with a accommodating cavity. The accommodating cavity is used to accommodate the thermal management component and the wall of the box body, so as to form a cavity at least between the thermal management component and the wall. The cavity is used to receive injection molding raw materials to mold a buffer layer, thereby obtaining the thermal management component, the wall and the buffer layer connected into an integrated structure in the battery box as described in any one of claims 1 to 9.

13. The battery box injection mold according to claim 12, characterized in that: The box body includes a bottom wall and a plurality of side walls, the plurality of side walls are connected to the bottom wall and enclose the accommodation space, the bottom wall is used to carry the battery monomer, and the wall portion is the bottom wall; Wherein, the cavity is entirely sandwiched between the bottom wall and the thermal management component.

14. The battery box injection mold according to claim 12, characterized in that: The box body comprises a bottom wall and a plurality of side walls, the plurality of side walls are connected to the bottom wall and enclose the accommodation space, the bottom wall is used to carry the battery monomer, and the wall portion is the bottom wall; Wherein, the cavity comprises: a first cavity portion, sandwiched between the bottom wall and the thermal management component in the thickness direction of the bottom wall; The second cavity portion is located between the first cavity portion and the side wall in the thickness direction of the side wall.

15. The battery box injection mold according to claim 14, characterized in that: The first cavity portion and the second cavity portion are connected to each other or are separated from each other.

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