Battery box

Abstract

The utility model discloses a battery box which comprises a battery box body, a box cover and battery cell modules, the battery box body and the box cover are matched with each other to form a closed space for containing multiple battery cell modules, each battery cell module comprises an air guide partition plate made of an insulating material and multiple battery cells, the air guide partition plate is arranged between every two battery cells, and the air guide partition plate is arranged between every two battery cells. And air guide channels among the battery cells are formed among the battery cells so as to cool the battery box body. According to the battery box, through the arrangement of the air guide plates and the air guide partition plates, the air distribution in the battery box is optimized, so that the purposes of reducing the temperature rise of the battery cell module and the temperature uniformity of the battery cell module are achieved, the heat dissipation effect of the battery box is improved, and by designing a multi-surface direct contact structure of cold air and the battery cells, the heat dissipation efficiency of the battery box is improved. The machining and mounting steps of the heat exchange structural part are omitted, and the cost and the production efficiency are optimized.

Description

Technical Field

[0001] The present application relates to the field of battery energy storage technology, and in particular to a battery box. Background Art

[0002] As a key technology for building a safe, economical and flexible smart grid and realizing renewable energy generation, energy storage technology has experienced explosive growth. As a lithium battery energy storage technology in electrochemical energy storage, lithium iron phosphate energy storage technology has the advantages of high safety, long life and low cost, and is currently widely used in the energy storage field.

[0003] Lithium batteries will cause heat accumulation during the charging and discharging process. In the battery module of integrated battery cells, the internal resistance and capacity of different single battery cells will further increase due to the temperature difference, shortening the cycle life of the battery system. The accumulation of heat exceeds the battery cell limit, which is easy to cause thermal runaway of the battery cell and cause safety hazards of the energy storage system. In the 1C energy storage system, the common air-cooled battery pack heat dissipation ideas are mostly to add heat exchange components such as harmonica tubes, heat exchange fins and other structural parts directly in contact with the surface of the battery cell, increase the heat exchange area of ​​the module, and then let the heat exchange components and cold air convection take away the heat of the battery cell. The heat exchange components in direct contact with the battery cell often need to be insulated. Due to cost constraints, the thermal conductivity of the heat exchange components after insulation treatment will be greatly reduced, and the heat exchange performance cannot be fully exerted. At the same time, it will also increase the complexity of the process. The increase in the types and number of heat exchange components will also complicate the structure and assembly of the product to a certain extent, which is not conducive to cost control and production efficiency.

[0004] It should be noted that the statements herein merely provide background information related to the present application and do not necessarily constitute prior art. Utility Model Content

[0005] In view of the above problems, the present application proposes a battery box that overcomes the above problems or at least partially solves the above problems.

[0006] The present application embodiment adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a battery box, comprising: a battery box body, a box cover, and a battery cell module, wherein the battery box body and the box cover cooperate with each other to form a closed space for accommodating multiple groups of the battery cell modules, the battery cell module comprises an air guide baffle made of an insulating material and a plurality of battery cells, the air guide baffle is arranged between each of the battery cells, and an inter-battery cell air guide channel is formed between the battery cells to dissipate heat from the battery box body.

[0008] Preferably, the battery box includes an air guide fixing frame, the air guide fixing frame is arranged at the bottom of the battery box, and the air guide fixing frame is provided with air guide holes. The air guide holes include longitudinal air guide holes of the fixing frame and transverse air guide holes of the fixing frame. An insulating Mylar sheet is arranged on the cross beam of the air guide fixing frame, and a battery cell module positioning groove and a battery cell module fixing screw hole are arranged on the vertical beam of the air guide fixing frame.

[0009] Preferably, the battery box further comprises a plurality of wind guide plates, through which the wind direction inside the battery box is guided. The wind guide plates comprise a front wind guide plate, a rear wind guide plate and a bottom wind guide plate.

[0010] Preferably, the battery cell module further comprises a module end plate, wherein the module end plate is arranged at both ends of the battery cell module, and the module end plate, the battery cell and the air guide partition between the battery cells are fastened by a cable tie.

[0011] Preferably, a fan module, an output module and a communication module are arranged on one side wall of the battery box, and box heat dissipation holes are arranged on the other side walls of the battery box. The fan module includes a plurality of axial flow fans. The output module includes an output terminal, and the communication module includes a communication terminal.

[0012] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0013] The present application arranges insulating air guide partitions between battery cells and sets an air guide fixing frame under the battery cell module to achieve the convergence of cold air and the main air duct and make multiple surfaces of the battery cell directly contact with the cold air, thereby optimizing the air flow organization in the battery box, thereby slowing down the temperature rise of the battery cell module and achieving the purpose of battery cell temperature uniformity.

[0014] The above description of the technical solution of the present application is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0016] Figure 1 This is an axonometric view of the battery box in the embodiment of the present application;

[0017] Figure 2This is an isometric view of the module structure in the battery box in the embodiment of the present application;

[0018] Figure 3 This is a rear axonometric view of the module structure in the battery box in the embodiment of the present application;

[0019] Figure 4 This is an axonometric view of the battery module fixing frame in the embodiment of the present application;

[0020] Figure 5 This is a right view of the battery module fixing frame in the embodiment of the present application

[0021] Figure 6 This is a schematic diagram of the wind flow at the bottom of the battery module in the embodiment of the present application;

[0022] Figure 7 This is an axonometric view of the air guide baffle between the battery modules in the embodiment of the present application;

[0023] Figure 8 Schematic diagram of the flow of cold air in the battery box in the embodiment of the present application.

[0024] In the present application, 1-battery box, 2-box cover, 3-axial flow fan, 4-output terminal, 5-box heat dissipation hole, 6-communication terminal, 7-module end plate, 8-front air guide plate, 9-battery cell module, 10-air guide partition, 11-air guide fixing frame, 12-rear air guide plate, 13-steel tie, 14-insulating Mylar sheet, 15-lateral air guide hole of fixing frame, 16-bottom air guide plate, 17-battery cell module positioning groove, 18-battery cell module fixing screw hole, 19-longitudinal air guide hole of fixing frame. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0026] The idea of ​​the present application is to design a battery box with strong universality in view of the current situation in which the heat generated by the battery cells in the battery box during operation cannot be efficiently discharged. By arranging insulating air-guiding partitions between the battery cells and providing an air-guiding fixing frame under the battery cell module, the cold air and the main air duct are merged and the battery cells are directly in contact with the cold air on multiple sides, thereby optimizing the air flow organization in the battery box, thereby slowing down the temperature rise of the battery cell module, achieving temperature uniformity of the battery cell module, improving the heat dissipation effect of the battery box, reducing the types of heat exchange components and processing procedures, and optimizing product cost and production efficiency.

[0027] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0028] The present application embodiment provides a battery box, combined with Figure 1-8 The battery box includes a battery box body 1, a box cover 2 and a battery cell module 9. The battery box body 1 and the box cover 2 cooperate with each other to form a closed space for accommodating multiple groups of the battery cell modules. The battery cell module 9 includes an air guide baffle 10 made of insulating material and multiple battery cells. The air guide baffle is arranged between each of the battery cells and forms an inter-battery cell air guide channel between the battery cells to dissipate heat from the battery box.

[0029] The battery box in this application can hold multiple groups of battery modules. This application only takes a battery box that holds two groups of battery modules 9 as an example, wherein the battery module includes multiple parallel-arranged battery cells. This application takes each group of battery modules as an example of 6 battery cells. The air guide baffle 10 is arranged between the parallel-arranged battery cells in each group of battery modules. One of its functions is to form insulation between the battery cells, and the other is to facilitate ventilation and heat dissipation between the battery cells to avoid heat accumulation. Figure 7 As shown, the air guide baffle 10 is generally square and hollow in structure, which is convenient for lateral ventilation. A protrusion is provided in the middle to facilitate longitudinal ventilation. The two ends are provided with criss-crossing plate ribs, which make the air guide baffle 10 more solid while ventilating. The air guide baffle in the present application is preferably made of plastic material, which can solve the insulation safety protection problem caused by the air guide structure between the battery cells in the air-cooled energy storage battery pack and realize the direct contact between the heat dissipation surface of the battery cell and the cold air for heat dissipation, reduce the heat dissipation devices, omit the processing and installation steps of the heat exchange structure, and optimize the cost and production efficiency.

[0030] In some examples of the present application, the battery box includes an air guide fixing frame 11, the air guide fixing frame is arranged at the bottom of the battery box, and the air guide fixing frame 11 is provided with air guide holes; the air guide holes include a fixing frame longitudinal air guide hole 19 and a fixing frame transverse air guide hole 15. An insulating Mylar sheet 14 is arranged on the crossbeam of the air guide fixing frame, and a battery cell module positioning groove 17 and a battery cell module fixing screw hole 18 are arranged on the vertical beam of the air guide fixing frame.

[0031] like Figure 4 , 5 As shown, in the present application, the air guide fixing frame 11 includes a horizontal beam and a longitudinal beam. There are four horizontal beams, on which insulating Mylar sheets 14 are arranged, and a horizontal air guide hole 15 is arranged inside the horizontal beam. There are two longitudinal beams, on which a battery cell module positioning groove 17 and a battery cell module fixing screw hole 18 are arranged. Among them, the battery cell module positioning groove 17 plays a positioning role when installing the battery cell module, which facilitates the installation of the battery cell module and the air guide fixing frame; the battery cell module fixing screw hole 18 facilitates the use of nuts to fasten the battery cell module and the air guide fixing frame. As shown in FIG. Figure 5As shown, the side of the wind guide fixing frame 11, that is, on the crossbeam, is provided with cross-frame air guide holes 15 of different vertical positions and sizes, and the front and rear of the wind guide fixing frame, that is, on the longitudinal beam, are provided with longitudinal air guide holes 19 of different vertical positions. The wind guide fixing frame 11 is placed at the bottom of the battery box 1. In this application, the insulating Mylar sheet 14 is used for the insulation treatment of the battery cell module. Since the direct contact between the battery cell module and the wind guide fixing frame may cause leakage, an insulating Mylar sheet is provided on the crossbeam of the wind guide fixing frame.

[0032] In some examples of the present application, the battery box further includes a plurality of air guide plates, through which the wind direction inside the battery box is guided. The air guide plates include a front air guide plate 8, a rear air guide plate 12 and a bottom air guide plate 16.

[0033] Combination Figure 2 , Figure 3 as well as Figure 6 In this application, in order to guide the direction of the wind flow inside the battery box, a plurality of air guide plates are arranged inside the battery box, including a front air guide plate 8, a rear air guide plate 12 and a bottom air guide plate 16, wherein the front air guide plate 8 is a metal triangular sheet metal, and the front air guide plate 8 is close to the battery cell module to reinforce the battery cell module 9. The bottom air guide plate 16 is arranged at the bottom of the battery box body and fixed to the battery box body. The bottom air guide plate is also arranged below the air guide fixing frame 11, and the bottom air guide plate 16 and the air guide fixing frame 11 are not in contact with each other. Figure 6 As shown in the schematic diagram of wind flow at the bottom of the battery cell module, the wind at the bottom of the battery box passes through the bottom wind guide plate located under the battery cell module during the blowing process. The bottom wind guide plate guides the wind upward and guides the wind to the bottom of the battery cell to speed up the air exchange at the bottom of the battery cell module and improve the heat dissipation efficiency.

[0034] In the present application, the air guide fixing frame 11 and the box body 1 form an air duct at the bottom of the battery cell module 9. Part of the cold air is supplemented by the lateral air guide holes 15 of the fixing frame and converges into the air duct at the bottom of the two battery cell modules 9, flows through the air guide plate 16 at the bottom of the box body, and is discharged out of the box body through the axial flow fan 3.

[0035] In some examples of the present application, the battery cell module also includes a module end plate 7, which is arranged at both ends of the battery cell module, and the module end plate 7, the battery cell and the air guide partition 10 between the battery cells are combined by a cable tie, and the battery cell module is fixed to the air guide fixing frame 11 by screws, wherein the cable tie is a steel cable tie 13.

[0036] In the present application, the module end plate 7 is an insulating material, preferably plastic. In order to fix the battery cells and the air guide baffle 10 in the battery cell module, the present application sets the module end plate 7 instead of the air guide baffle on the outside of the battery cells at both ends of the battery cell module. Since the module end plate is more wear-resistant and extrusion-resistant, a tie groove can be set on the module end plate, so that the steel tie 13 is not easy to fall off when fixing the module end plate, the battery cell and the air guide baffle between the battery cells. Two steel tie ties 13 are tied on each group of battery cell modules described in the present application. It can be understood that the module end plate is used to support the battery cells and air guide baffles inside it to form a battery cell module.

[0037] In some examples of the present application, the battery box 1 is provided with box heat dissipation holes 5 on the left, right and back sides to facilitate ventilation of the battery box and heat exchange with the outside.

[0038] In some examples of the present application, a fan module, an output module and a communication module are provided on one side wall of the battery box 1, and a box heat dissipation hole 5 is provided on the other side wall of the battery box. The fan module includes a plurality of axial flow fans 3. The output module includes an output terminal 4, and the communication module includes a communication terminal 6.

[0039] like Figure 8 As shown, the schematic diagram of the flow of cold air in the battery box, the front air guide plate 8, the rear air guide plate 12, the battery box 1, form two air ducts on the left and right of the battery module 9, and converge between the two battery modules 9 through the air guide partition 10 in the middle of the module, and are sent out of the box through the axial flow fan 3. The cold air is supplemented and converged in the main air duct, and the battery cells are directly cooled on multiple sides at the same time, thereby optimizing the internal temperature field in the battery box, realizing balanced heat exchange control of all batteries in the battery pack, improving the consistency of battery operating temperature, and extending the safe service life of the battery.

[0040] It can be understood that the battery box in this application is assembled, and its components can be processed separately, simplifying the production process and improving manufacturing efficiency. At the same time, this application reduces the types of heat exchange components and processing procedures, optimizes product costs, and improves production efficiency.

[0041] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0042] In this application, unless otherwise clearly specified and limited, the terms "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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 present application. In this specification, 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 any one or more embodiments or examples in a suitable manner.

[0046] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery box, characterized in that: include: A battery box, a box cover and a battery cell module, wherein the battery box and the box cover cooperate with each other to form a closed space for accommodating multiple groups of battery cell modules, the battery cell module includes an air guide baffle made of insulating material and multiple battery cells, the air guide baffle is arranged between each of the battery cells, and an inter-battery cell air guide channel is formed between the battery cells to dissipate heat from the battery box.

2. The battery box according to claim 1, characterized in that: The battery box body comprises an air guide fixing frame, the air guide fixing frame is arranged at the bottom of the battery box body, and the air guide fixing frame is provided with air guide holes.

3. The battery box according to claim 2, characterized in that: An insulating Mylar sheet is arranged on the horizontal beam of the air guide fixing frame, and a battery cell module positioning groove and a battery cell module fixing screw hole are arranged on the vertical beam of the air guide fixing frame.

4. The battery box according to claim 1, characterized in that: The battery box body also includes a plurality of wind guide plates, through which the wind direction inside the battery box is guided.

5. The battery box according to claim 4, characterized in that: The air guide plate includes a front air guide plate, a rear air guide plate and a bottom air guide plate.

6. The battery box according to claim 3, characterized in that: The battery cell module further includes a module end plate, which is arranged at both ends of the battery cell module, and the module end plate, the battery cell and the air guide partition between the battery cells are fastened by a cable tie.

7. The battery box according to claim 1, characterized in that: A fan module, an output module and a communication module are arranged on one side wall of the battery box, and box heat dissipation holes are arranged on the other side walls of the battery box.

8. The battery box according to claim 7, characterized in that: The fan module includes a plurality of axial flow fans.

9. The battery box according to claim 7, characterized in that: The output module includes an output terminal, and the communication module includes a communication terminal.

10. The battery box according to claim 2, characterized in that: The air guide holes include a longitudinal air guide hole of the fixing frame and a transverse air guide hole of the fixing frame.

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