Power battery CCS temperature acquisition structure

Abstract

The utility model discloses a power battery CCS temperature acquisition structure, which comprises an acquisition branch structure and a busbar, the acquisition branch structure comprises an acquisition plate, a temperature sensing device and a reinforcing plate, the temperature sensing device is fixed on the upper surface of the acquisition plate, and the reinforcing plate is fixed on the lower surface of the acquisition plate. The projection of the temperature sensing device on the acquisition plate falls in the projection of the reinforcing plate on the acquisition plate, and the reinforcing plate and the busbar are in lap joint and welded connection. The temperature acquisition precision is high, the reinforcing plate for acquiring the temperature is attached to the surface of the busbar, the heat conductivity coefficient of the reinforcing plate is far greater than that of glue, and the temperature conducted by the acquired reinforcing plate is almost completely consistent with the actual temperature of the busbar; the structure is compact, the space of the acquisition board main body is not occupied, and the wiring pressure of the large-module acquisition board is reduced; product procedures are reduced, production efficiency is improved, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, concretely relates to a power battery CCS temperature acquisition structure. BACKGROUND

[0002] With the rapid development of electric vehicle industry, the electrification trend of power assembly is more and more obvious. As the power core of electric vehicle, the battery is a very important part of the whole electric vehicle, and its temperature characteristics directly affect the performance, service life and durability of electric vehicle. At present, under the condition that the capacity of power battery is limited, the grouping technology level of power battery, especially the power battery thermal management system, is crucial to improve the consistency of power battery and ensure the safety of the whole vehicle. During the operation of electric vehicle, a large amount of heat will be generated during the charging and discharging of power battery. If heat dissipation is not carried out in time, the internal temperature of power battery pack will rise sharply, resulting in continuous increase of temperature difference, thus aggravating the inconsistency of power battery internal resistance and capacity, and even leading to thermal runaway, which has great safety hidden danger. Therefore, according to the demand of the battery system, a certain number of temperature signal acquisition structures will be arranged on the CCS integrated busbar to monitor the temperature.

[0003] According to the different temperature signal acquisition positions, it is generally divided into battery top cover temperature acquisition and busbar temperature acquisition. For the busbar temperature acquisition structure, the commonly used schemes include two kinds of temperature acquisition structures, one is 3D nickel sheet temperature acquisition structure, and the other is busbar embedded NTC temperature acquisition structure. However, the applicant finds that the 3D nickel sheet temperature acquisition structure at least has the following disadvantages: the temperature acquisition position is a certain distance away from the aluminum bar, the collected temperature is conducted from the aluminum bar to the nickel sheet, and then the nickel sheet conducts the temperature to the NTC through the heat-conducting glue, so there is a certain difference between the collected temperature and the actual temperature of the aluminum bar, which needs to be compensated in the control system; the acquisition position will occupy the width of the signal acquisition circuit board, and in the case that there are many acquisition lines on the circuit board, it will lead to insufficient wiring space. For the busbar embedded NTC temperature acquisition structure, at least the following disadvantages exist: the NTC position needs to be glued for protection in the processing of the circuit board, and the NTC needs to be glued again after being embedded in the aluminum bar, and during the processing, the product needs to be turned over for gluing, which will lead to more overall processes. Because there is a protection frame around the NTC, the protection frame itself is not heat-conductive, so the thickness of the aluminum bar needs to be greater than the thickness of the protection frame to ensure that the glue can conduct the temperature of the aluminum bar to the NTC after filling, which has great limitation in use. Therefore, it is necessary to develop a new type of power battery CCS temperature acquisition structure to solve the above problems. UTILITY MODEL CONTENTS

[0004] In view of at least one of the above technical problems, the utility model aims to provide a power battery CCS temperature acquisition structure with high temperature acquisition precision, simple processing and low cost.

[0005] The technical scheme of the utility model discloses

[0006] The utility model discloses a kind of power battery CCS temperature acquisition structures, including collection branch structure and the busbar being connected with the collection branch structure, the collection branch structure includes collection board, temperature sensing device and reinforcing plate, the temperature sensing device is fixed on the upper surface of the collection board, the reinforcing plate is fixed on the lower surface of the collection board, and the projection of the temperature sensing device on the collection board falls in the projection of the reinforcing plate on the collection board, the reinforcing plate is overlapped and fixedly connected with the busbar.

[0007] Preferably, the reinforcing plate is divided into a reinforcing region and at least one connecting region adjacent to the reinforcing region, the region of the reinforcing plate where the collection board is fixed is implemented as the reinforcing region, and the region of the reinforcing plate where the busbar is connected is implemented as the connecting region.

[0008] Preferably, the connecting region of the reinforcing plate is implemented as a welding region or an adhesive region, the welding region of the reinforcing plate is welded with the busbar, or the adhesive region is adhesively fixed with the busbar.

[0009] Preferably, the middle region of the upper surface of the reinforcing plate is implemented as the reinforcing region, each end region of the upper surface of the reinforcing plate is provided with one welding region, the reinforcing plate around the temperature sensing device is fitted into the mounting slot of the busbar, and the welding region at each end of the upper surface of the reinforcing plate is overlapped and welded with the lower surface of the busbar.

[0010] Preferably, the temperature acquisition structure further comprises an insulating film, the insulating film is hot-pressed on the lower surface of the collection board and the reinforcing plate, and the insulating film is provided with a first avoiding through hole corresponding to the two welding regions of the reinforcing plate.

[0011] Preferably, one end of the upper surface of the reinforcing plate is implemented as the reinforcing region, the other end of the lower surface of the reinforcing plate is implemented as the welding region, and the welding region is welded with the upper surface of the busbar.

[0012] Preferably, the temperature acquisition structure further comprises an insulating film, the insulating film is hot-pressed on the upper surface of the collection board, and the insulating film is provided with a second avoiding through hole corresponding to the welding region of the reinforcing plate.

[0013] Preferably, the collection branch structure further comprises a protection block, the protection block is wrapped around the temperature sensing device and is provided with protection glue.

[0014] Preferably, the reinforcing plate is bonded to the lower surface of the acquisition plate with thermosetting adhesive, and the thermal conductivity of the reinforcing plate is greater than that of the thermosetting adhesive and the protective adhesive.

[0015] Preferably, the reinforcing plate is one of aluminum sheet, nickel sheet, copper sheet, or stainless steel sheet.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] This utility model discloses a CCS temperature acquisition structure for power batteries, which has the following advantages: 1. High temperature acquisition accuracy: The reinforcing plate for acquiring temperature is attached to the surface of the busbar, and the thermal conductivity of the reinforcing plate is much greater than that of the adhesive. The temperature conducted through the reinforcing plate is almost completely consistent with the actual temperature of the busbar; 2. Compact structure: It does not occupy the main space of the acquisition board, reducing the wiring pressure of the large module acquisition board; 3. Reduced product processes and improved production efficiency: The reduction of processes or materials lowers costs. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is an exploded view of the acquisition branch structure of the power battery CCS temperature acquisition structure according to an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the first acquisition branch structure;

[0021] Figure 3 For containing Figure 2 An exploded structural diagram of the temperature acquisition structure of the first acquisition branch structure, the first busbar, and the first insulating film;

[0022] Figure 4 For containing Figure 3 A schematic diagram of the temperature acquisition structure;

[0023] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0024] Figure 6 This is a schematic diagram of the second acquisition branch structure;

[0025] Figure 7 For containing Figure 6 An exploded structural diagram of the temperature acquisition structure of the second acquisition branch, the second busbar, and the second insulating membrane;

[0026] Figure 8 For containing Figure 7 A schematic diagram of the temperature acquisition structure;

[0027] Figure 9 For Figure 8 The local enlarged view of the middle B part.

[0028] Wherein: 10, collection branch structure; 10a, first collection branch structure; 10b, second collection branch structure; 11, collection plate; 12, reinforcing plate; 12a, first reinforcing plate; 121a, first welding area; 12b, second reinforcing plate; 121b, second welding area; 13, temperature sensing device; 14, protective block; 15, protective glue; 20a, first busbar; 20b, second busbar; 21, mounting notch; 30a, first insulating film; 31, first avoiding through hole; 30b, second insulating film; 32, second avoiding through hole. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further explained in detail below in combination with specific implementation manners and with reference to the drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0030] The utility model discloses a power battery CCS temperature collection structure, see Figures 1 to 9 , including collection branch structure 10 and busbar, collection branch structure 10 includes collection plate 11, temperature sensing device 13 (exemplary for the existing conventional NTC), reinforcing plate 12 and protective block 14. Temperature sensing device 13 is fixed on the upper surface of collection plate 11. Reinforcing plate 12 is fixed on the lower surface of collection plate 11, and the surface of reinforcing plate 12 is divided into a reinforcing area and at least one connecting area adjacent to the reinforcing area. It should be noted that, since reinforcing plate 12 has two upper and lower surfaces, therefore, the reinforcing area and the welding area of the utility model embodiment are the reinforcing area and the connecting area including the upper surface and the lower surface. The area of reinforcing plate 12 fixed with collection plate 11 is implemented as a reinforcing area. In the utility model embodiment, temperature sensing device 13 is fixedly connected, such as welded, on the upper surface of collection plate 11 and corresponds to the reinforcing area, that is, the projection of temperature sensing device 13 on collection plate 11 falls within the projection of reinforcing plate 12 on collection plate 11. Protective block 14 is a square frame body with a hollow middle, open upper and lower end faces, and is made of existing conventional F4R protective frame. Protective block 14 is wrapped around the outer periphery of temperature sensing device 13 and is point protected with protective glue 15 (protective glue 15 is existing conventional NTC protective glue 15 that can connect busbar and collection branch structure 10). The connecting area of reinforcing plate 12 is overlapped and fixedly connected with the busbar.

[0031] For the fixed connection mode of the reinforcing plate 12 and the busbar, it can include welding (the existing conventional laser welding) or bonding (the existing conventional CCS glue) and the like connection mode known by those skilled in the art. That is, the connection area of the reinforcing plate 12 in the embodiment of the utility model is implemented as a welding area or a bonding area. In some preferred embodiments of the utility model, the reinforcing plate 12 and the busbar are fixed by welding, that is, the above-mentioned connection area is implemented as a welding area.

[0032] The reinforcing plate 12 of the collection branch structure 10 has two arrangement modes, and correspondingly, the connection mode of the collection branch structure 10 and the busbar and the structure of the busbar also have two modes. More specifically, the first arrangement mode of the reinforcing plate 12 of the collection branch structure 10 is as shown in the figure Figures 2 to 5 For convenience of distinction, the collection branch structure of this embodiment is described as the first collection branch structure 10a, the middle area of the upper surface of the reinforcing plate (for the same reason, for convenience of distinction, the reinforcing plate 12 of this embodiment is described as the first reinforcing plate 12a) is implemented as a reinforcing area (for the same reason, for convenience of distinction, it is described as the first reinforcing area here), the two end areas of the upper surface of the first reinforcing plate 12a are respectively provided with a welding area (for the same reason, for convenience of distinction, it is described as the first welding area 121a here), the first reinforcing plate 12a of the outer periphery of the temperature sensing device 13 is loaded into the mounting slot 21 of the busbar (for the same reason, for convenience of distinction, it is described as the first busbar 20a here) and is provided with protective glue (for the same reason, the protective glue is exemplarily NTC protective glue 15 which can connect the first busbar 20a and the first collection branch structure 10a, so as to ensure that the temperature of the first busbar 20a can be conducted to the NTC through the protective glue) in the mounting slot 21, and the first welding area 121a of the two ends of the upper surface of the first reinforcing plate 12a is respectively overlapped and welded with the lower surface of the first busbar 20a. Preferably, when the protective block 14 is loaded into the mounting slot 21 of the first busbar 20a, an insulating film (the material is not limited to the conventional insulating film in the existing temperature collection structure, for the sake of distinction from the insulating film in the latter embodiment, the insulating film in this embodiment is described as the first insulating film 30a) is hot-pressed on the lower surface of the collection plate 11 and the first reinforcing plate 12a. In this embodiment, the first insulating film 30a is provided with a first avoiding through hole 31 corresponding to the two first welding areas 121a of the first reinforcing plate 12a, and the first avoiding through hole 31 is provided for the welding gun to provide an avoiding space, so as to facilitate the welding operation of the welding gun on the first welding area of the first reinforcing plate 12a. For the shape of the first avoiding through hole 31, it is exemplarily square. For the size of the first avoiding through hole 31, preferably, the length of the first avoiding through hole 31 is not less than the width of the first reinforcing plate 12a, and the width of the first avoiding through hole 31 is not greater than the length of the first welding area 121a. The structure of the first busbar 20a corresponding to this embodiment is as shown in the figureFigure 3 As shown in the drawings, a square mounting notch 21 matching the shape and size of the protection block 14 is formed on the first busbar 20a, and the protection block 14 is pressed into the mounting notch 21 upward or the first busbar 20a is pressed downward so that the protection block 14 is pressed in the mounting notch 21 during installation, and then the first insulating film 30a is hot-pressed on the lower surface of the collection plate 11 and the first reinforcing plate 12a. After hot-pressing the first insulating film 30a, the integrated busbar needs to be turned over, and the mounting notch 21 on the first busbar 20a is glued and solidified.

[0033] The second arrangement of the reinforcing plate 12 of the collection branch structure 10 in the embodiment of the utility model is shown in the drawings Figures 6 to 9 As shown in the drawings, similarly, in order to facilitate description and distinction, the collection branch structure of this embodiment is described as the second collection branch structure 10b, and one end (exemplarily left end in the drawings) of the upper surface of the reinforcing plate (similarly, in order to facilitate distinction, the reinforcing plate of this embodiment is described as the second reinforcing plate 12b) is implemented as a reinforcing area (similarly, in order to facilitate distinction, the reinforcing area of this embodiment is described as the second reinforcing area), and the other end of the lower surface of the second reinforcing plate 12b, that is, the right end exemplarily shown in the drawings, is implemented as a welding area (similarly, in order to facilitate distinction, the welding area of this embodiment is described as the second welding area 121b), and the second welding area 121b is welded and connected with the upper surface of the busbar (similarly, in order to facilitate distinction, the busbar of this embodiment is described as the second busbar 20b). Preferably, the insulating film (in order to distinguish from the previous embodiment, the insulating film of this embodiment is described as the second insulating film 30b) is hot-pressed on the upper surface of the collection plate 11, and similarly, the material of the second insulating film 30b is the insulating film of the existing conventional temperature collection structure, which is not limited. Preferably, in order to provide an avoidance for the welding gun and facilitate the welding gun to be pressed on the second welding area 121b of the second reinforcing plate 12b to perform welding operation, a second avoidance through hole 32 is formed on the second insulating film 30b corresponding to the second welding area 121b of the second reinforcing plate 12b in this embodiment. As for the shape of the second avoidance through hole 32, it is exemplarily circular. As for the size of the second avoidance through hole 32, preferably, the diameter of the second avoidance through hole 32 is not less than the width of the second reinforcing plate 12b, and the diameter of the second avoidance through hole 32 is not greater than the length of the second welding area 121b. As shown in the drawings, Figure 7 As shown in the drawings, the mounting notch is not formed on the second busbar 20b corresponding to this embodiment, as shown in the drawings, Figure 8 and Figure 9 As shown in the drawings, the second busbar 20b is directly overlapped and fixed by welding with the second welding area 121b of the right end of the lower surface of the second reinforcing plate 12b.

[0034] For the reinforcing plate 12 of the above two embodiments, the structure and shape are the same, and are all rectangular plates, and the difference is only in the distribution of the reinforcing area and the welding area, and the material can be selected from aluminum sheet, nickel sheet, copper sheet or stainless steel sheet and other materials that can be laser welded with the bus bar. Preferably, the thermal conductivity of the reinforcing plate 12 of the utility model embodiment is greater than the thermal conductivity of the protective glue 15 and the thermosetting glue. In the utility model embodiment, the aluminum sheet is preferred, and the thermal conductivity thereof is greater than the thermal conductivity of the NTC protective glue 15, and the reinforcing plate 12 is directly in contact (welded or pasted) with the surface of the bus bar, so that the temperature conducted by the aluminum sheet is almost completely consistent with the actual temperature of the bus bar, thereby improving the accuracy of temperature acquisition.

[0035] The power battery CCS temperature acquisition structure of the utility model embodiment has the following advantages: high temperature acquisition accuracy, the reinforcing plate 12 for acquiring temperature is attached to the surface of the bus bar, and the thermal conductivity of the reinforcing plate 12 is much greater than that of the glue, so that the temperature conducted by the reinforcing plate 12 is almost completely consistent with the actual temperature of the bus bar; compact structure, does not occupy the main space of the acquisition plate 11, reduces the wiring pressure of the large module acquisition plate 11; reduces product processes, improves production efficiency; reduces processes or materials, and reduces costs.

[0036] It should be understood that the above specific embodiments of the utility model are only used for illustrative or explanatory purposes of the principles of the utility model, and do not constitute a limitation on the utility model. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the utility model shall be included in the protection scope of the utility model. In addition, the appended claims of the utility model are intended to cover all changes and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. A power battery CCS temperature acquisition structure, comprising an acquisition branch structure and a busbar connected to the acquisition branch structure, characterized in that, The data acquisition branch structure includes a data acquisition plate, a temperature sensing device, and a reinforcing plate. The temperature sensing device is fixed to the upper surface of the data acquisition plate, and the reinforcing plate is fixed to the lower surface of the data acquisition plate. The projection of the temperature sensing device on the data acquisition plate falls within the projection of the reinforcing plate on the data acquisition plate. The reinforcing plate overlaps with and is fixedly connected to the busbar.

2. The temperature acquisition structure according to claim 1, characterized in that, The reinforcing plate is divided into a reinforcing area and at least one connecting area adjacent to the reinforcing area. The area on the reinforcing plate that is fixed to the acquisition plate is the reinforcing area, and the area on the reinforcing plate that is connected to the busbar is the connecting area.

3. The temperature acquisition structure according to claim 2, characterized in that, The connecting area of ​​the reinforcing plate is implemented as a welding area or an adhesive area, wherein the welding area of ​​the reinforcing plate is welded to the busbar or the adhesive area is bonded to the busbar.

4. The temperature acquisition structure according to claim 3, characterized in that, The middle area of ​​the upper surface of the reinforcing plate is the reinforcing area, and each of the two ends of the upper surface of the reinforcing plate is provided with a welding area. The reinforcing plate on the outer periphery of the temperature sensing device is inserted into the mounting slot opened on the busbar, and protective glue is applied in the mounting slot. The welding areas at both ends of the upper surface of the reinforcing plate overlap and are welded to the lower surface of the busbar.

5. The temperature acquisition structure according to claim 4, characterized in that, The temperature acquisition structure also includes an insulating film, which is hot-pressed onto the lower surfaces of the acquisition plate and the reinforcing plate. A first clearance through hole is opened on the insulating film corresponding to the two welding areas of the reinforcing plate.

6. The temperature acquisition structure according to claim 3, characterized in that, One end of the upper surface of the reinforcing plate is the reinforcing area, and the other end of the lower surface of the reinforcing plate is the welding area, which is welded to the upper surface of the busbar.

7. The temperature acquisition structure according to claim 6, characterized in that, The temperature acquisition structure also includes an insulating film, which is hot-pressed onto the upper surface of the acquisition plate. A second clearance through hole is opened on the insulating film corresponding to the welding area of ​​the reinforcing plate.

8. The temperature acquisition structure according to any one of claims 1-7, characterized in that, The acquisition branch structure also includes a protective block, which covers the outer periphery of the temperature sensing device and applies protective adhesive.

9. The temperature acquisition structure according to claim 8, characterized in that, The reinforcing plate is bonded to the lower surface of the acquisition plate with thermosetting adhesive, and the thermal conductivity of the reinforcing plate is greater than that of the thermosetting adhesive and the protective adhesive.

10. The temperature acquisition structure according to claim 1, characterized in that, The reinforcing plate is one of aluminum sheet, nickel sheet, copper sheet, or stainless steel sheet.

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