Structure for improving CCS temperature acquisition precision

Abstract

The utility model discloses a structure for improving CCS temperature acquisition precision, which comprises a special-shaped conducting bar, an FPC acquisition soft bar, a nickel sheet and an NTC thermistor, the special-shaped conducting bar comprises a pressing and attaching detection convex part pressed and attached to the FPC acquisition soft bar, the pressing and attaching detection convex part is provided with a monitoring avoiding hole, the NTC thermistor is arranged in the monitoring avoiding hole, and the nickel sheet is arranged in the monitoring avoiding hole. The special-shaped conducting bar is connected with a first flat cable of the FPC acquisition flexible bar, and the special-shaped conducting bar is connected with a second flat cable of the FPC acquisition flexible bar through a nickel sheet. The beneficial effects are that the special-shaped conducting bar is provided with the protruding pressing detection convex part and the monitoring avoiding hole matched with the NTC thermistor, the module cell temperature acquisition precision and the temperature difference stabilizing effect are improved, the lower surface of the pressing detection convex part is attached to the upper surface of the FPC, the influence of the external environment on the NTC thermistor is reduced, the FPC material and the internal stress can be reduced, and the production cost is reduced. The device has the advantages of low cost and long service life.

Description

Technical Field

[0001] The utility model relates to the field of battery module temperature acquisition devices, in particular to a structure for improving the CCS temperature acquisition accuracy. Background Art

[0002] When using the energy storage PACK, you need to install CCS (Cells Contact System, integrated busbar), which is a collection harness + conductive busbar + integration method. The collection harness is used to collect the voltage and temperature of the single battery cell. The FPC (Flexible Printed Circuit) is a form of the collection harness. It communicates with the BMS board through a connector to monitor the voltage and temperature of the battery cell in real time. The conductive busbar is used to connect the single battery cells in series (parallel) to ensure that the connected battery module can reach the corresponding voltage or power. The integration method refers to the process of integrating the FPC and the conductive busbar. Common plastic bracket assembly integration, blister integration and PET film hot pressing integration.

[0003] The main component for collecting the cell temperature and providing it to the main control program for operation strategy regulation is the NTC thermistor. With the gradual development of related technical research, the system's requirements for temperature sampling accuracy are gradually increasing. The traditional energy storage module temperature sampling solution generally has the problem of insufficient temperature sampling accuracy due to the NTC thermistor being in an open position and requiring multi-level path transmission such as aluminum bars and nickel sheets. For example Figure 5 , 6 In the prior art shown in the figure, the temperature conduction path is: the pole of the battery cell → the conductive bus → the nickel sheet → the FPC collection soft bus → the NTC thermistor. The temperature actually collected by the NTC thermistor is quite different from the actual temperature of the conductive bus. The main reasons are: ① the heat loss is large in the transfer path; ② the NTC thermistor is in an open position and is greatly affected by the environment; the temperature difference collected by the NTC thermistor fluctuates irregularly according to the different environments in the PACK, resulting in the system being unable to accurately control the operating status.

[0004] Therefore, a new CCS structure is needed to ensure accurate and stable temperature sampling. Utility Model Content

[0005] The purpose of the utility model is to provide a structure for improving the CCS temperature acquisition accuracy in order to solve the above problems.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A structure for improving the temperature acquisition accuracy of CCS comprises a special-shaped conductive bus, an FPC acquisition bus, a nickel sheet and an NTC thermistor, wherein the special-shaped conductive bus comprises a pressing detection convex portion, the pressing detection convex portion is pressed and attached to the FPC acquisition bus, the pressing detection convex portion is provided with a monitoring avoidance hole, the NTC thermistor is arranged in the monitoring avoidance hole, the NTC thermistor is connected to a first row of wires of the FPC acquisition bus, and the special-shaped conductive bus is connected to a second row of wires of the FPC acquisition bus through the nickel sheet.

[0008] Furthermore, the nickel sheet is composed of a conductive bar mounting portion, a soft bar mounting portion, and a connecting portion connecting the conductive bar mounting portion and the soft bar mounting portion, and the height of the connecting portion is equal to or approximately equal to the thickness of the special-shaped conductive bar.

[0009] Furthermore, the special-shaped conductive bar consists of a conductive bar main body and the pressing detection protrusion integrally connected to the conductive bar main body.

[0010] Furthermore, the NTC thermistor is welded to the first row of cables.

[0011] Furthermore, the monitoring avoidance hole outside the NTC thermistor is filled with an anti-interference glue layer.

[0012] Furthermore, a battery core group is provided at the bottom of the special-shaped conductive bar, a welding groove is provided on the conductive bar body, and the pole of the battery core group is fitted with the lower part of the welding groove.

[0013] Furthermore, the battery core group includes a plurality of battery cells, and each of the battery cells includes two poles.

[0014] Furthermore, the special-shaped conductive bus is electrically connected to the pole.

[0015] Furthermore, the plurality of battery cells are connected in series via special-shaped conductive bars.

[0016] The beneficial effects of the utility model are:

[0017] 1. The special-shaped conductive bar has a protruding pressing detection convex part and is provided with a monitoring hole that cooperates with the NTC thermistor. The remaining space is filled with glue to improve the temperature collection accuracy of the module core and the effect of stabilizing the temperature difference;

[0018] 2. The lower surface of the pressing detection convex part of the special-shaped conductive bar is fitted with the upper surface of the FPC, which can reduce the impact of the external environment on the NTC thermistor, reduce FPC materials, reduce costs, reduce FPC internal stress, and increase life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a structure for improving the CCS temperature collection accuracy and a battery core assembly structure diagram of the utility model;

[0020] Figure 2 This is an overall structural diagram of a structure for improving the CCS temperature acquisition accuracy of the utility model;

[0021] Figure 3 This is an enlarged schematic diagram of area A of a structure for improving the temperature acquisition accuracy of CCS in the utility model;

[0022] Figure 4 This is a structural diagram of a special-shaped conductive bar of the utility model for improving the temperature acquisition accuracy of CCS;

[0023] Figure 5 This is the overall diagram of the traditional CCS temperature acquisition structure;

[0024] Figure 6 This is a partial enlarged view of the traditional CCS temperature collection structure.

[0025] The following are the descriptions of the reference numerals:

[0026] 1 Special-shaped conductive bar 2 FPC acquisition software 4 NTC Thermistors 11 Conductive bar body 3 Nickel Sheet 5 Traditional conductive bar 12 Pressing detection convex part 31 Conductive bar installation 6 Traditional thermal conductive nickel sheet 13 Monitoring hole avoidance 32 Connection 7 Battery Cells 14 Welding slot 33 Soft row installation department 71 Battery Cell DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings, embodiments and comparative examples: Example

[0028] like Figure 1 - Figure 4 As shown, a structure for improving the CCS temperature acquisition accuracy is composed of a special-shaped conductive bus 1, an FPC acquisition soft bus 2, a nickel sheet 3 and an NTC thermistor 4;

[0029] A monitoring hole 13 is provided on the special-shaped conductive bar 1, and an NTC thermistor 4 is arranged in the monitoring hole 13, which is used to directly detect the heat conducted by the special-shaped conductive bar 1. The NTC thermistor 4 is connected to the first row of wires of the FPC collection soft bar 2, so that the temperature collected by the NTC thermistor 4 is transmitted through the first row of wires of the FPC collection soft bar 2;

[0030] The special-shaped conductive bus 1 is connected with the second row of wires of the FPC collection soft bus 2 through the nickel sheet 3, so as to facilitate the transmission of parameters such as the voltage and power of the battery through the second row of wires of the FPC collection soft bus 2.

[0031] like Figure 1 - Figure 4 As shown, the utility model also discloses the following more optimized specific structures:

[0032] The special-shaped conductive bus 1 consists of a conductive bus body 11 and a pressing detection protrusion 12 integrally connected to the conductive bus body 11. The pressing detection protrusion 12 is pressed and attached to the FPC collection soft bus 2. The monitoring avoidance hole 13 is arranged on the pressing detection protrusion 12. In other words, the pressing detection protrusion 12 is provided with a monitoring avoidance hole 13.

[0033] The NTC thermistor 4 is welded to the first row of wires of the FPC collection soft row 2 to achieve electrical connection between the two.

[0034] In one embodiment, the thickness of the special-shaped conductive row 1 is uniform, and the thickness of the FPC collection soft row 2 is uniform.

[0035] The monitoring avoidance hole 13 outside the NTC thermistor 4 is filled with an anti-interference glue layer, for example, it can be filled and fixed by UV glue, so as to effectively reduce the interference of the external environment.

[0036] The nickel sheet 3 is composed of a conductive bar mounting portion 31, a flexible bar mounting portion 33, and a connecting portion 32 connecting the conductive bar mounting portion 31 and the flexible bar mounting portion 33. There is a certain height difference between the conductive bar mounting portion 31 and the flexible bar mounting portion 33, namely, the height of the connecting portion 32. The height of the connecting portion 32 is equal to or approximately equal to the thickness of the special-shaped conductive bar 1. The nickel sheet 3 can better realize the electrical connection between the conductive bar body 11 and the FPC collection soft bar 2. At the same time, there is a certain height difference between the conductive bar mounting portion 31 and the flexible bar mounting portion 33, which facilitates the better pressing of the pressing detection protrusion 12 of the special-shaped conductive bar 1 onto the FPC collection soft bar 2, and avoids the special-shaped conductive bar 1 being lifted up when the nickel sheet is connected to the special-shaped conductive bar 1 and the FPC collection soft bar 2, so that the bottom of the pressing detection protrusion 12 cannot be perfectly pressed onto the FPC collection soft bar 2.

[0037] A battery core group 7 is provided at the bottom of the special-shaped conductive bar 1. The battery core group 7 includes a plurality of battery cells 71 ( Figure 1 In the embodiment, the battery core group 7 includes 9 battery cells 71. In other embodiments, the battery cells 71 may also be other numbers, such as 3, 6, 12, etc., which can be selected according to actual needs). A welding groove 14 is provided on the conductive bar body 11. The pole of the battery core group 7 fits the lower part of the welding groove 14. The conductive bar body 11 and the pole can be welded together at the welding groove 14 by laser welding to achieve electrical connection between the conductive bar body 11 and the pole, that is, to achieve electrical connection between the special-shaped conductive bar 1 and the pole; it can be understood that the pole of the battery core group 7 is also the pole of the battery cell 71, and each battery cell 71 has two poles, namely the positive pole and the negative pole; in one embodiment, the positive pole of a battery cell is electrically connected to the negative pole of another adjacent battery cell through the special-shaped conductive bar 1, so as to achieve series connection between the battery cells, that is, when there are two battery cells, the two battery cells are connected in series; when there are more than two battery cells, the more than two battery cells are connected in series.

[0038] like Figure 1 - Figure 4 The pole of the battery core group 7 transfers heat to the special-shaped conductive bar 1, and the NTC thermistor 4 in the monitoring avoidance hole 13 directly transfers the temperature to the FPC acquisition soft bar 2 after detecting the temperature, effectively shortening the heat transfer path and eliminating the nickel sheet node with large heat loss. The NTC thermistor 4 is placed in the monitoring avoidance hole 13 inside the special-shaped conductive bar 1 and fixed with UV glue to form an anti-interference glue layer, which effectively reduces external environmental interference and improves the module battery core temperature acquisition accuracy and temperature difference stability;

[0039] In this embodiment, the medium through which heat is conducted is reduced, the heat conduction path is shortened, heat loss and environmental interference are reduced, and the temperature difference between the conductive bar temperature and the NTC thermistor collection temperature is controlled to be lower, meeting the accuracy requirements of thermal design and temperature collection.

[0040] Comparative Example

[0041] like Figure 5 - Figure 6 As shown, a traditional CCS temperature collection structure is composed of an FPC collection soft row 2, an NTC thermistor 4, a traditional conductive row 5 and a traditional thermal conductive nickel sheet 6;

[0042] The NTC thermistor 4 is mounted on a conventional thermally conductive nickel sheet 6 , and the FPC collection soft row 2 and the conventional conductive row 5 are connected via the conventional thermally conductive nickel sheet 6 .

[0043] In this comparative example, the heat of the battery cell pole is first transferred to the traditional thermal conductive nickel sheet 6 after passing through the traditional conductive bar 5 and then detected by the NTC thermistor 4. During the transfer process, part of the heat is lost, and the NTC thermistor 4 is in an open position with no cover on the top, and is greatly affected by the environmental interference. The temperature difference after collection fluctuates irregularly according to the different environments in the battery PACK (battery pack), resulting in the system being unable to accurately control the operating status.

[0044] Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected.

Claims

1. A structure for improving the CCS temperature acquisition accuracy, characterized by: It includes a special-shaped conductive bus, an FPC collection bus, a nickel sheet and an NTC thermistor. The special-shaped conductive bus includes a pressing detection convex portion, the pressing detection convex portion is pressed and attached to the FPC collection bus, the pressing detection convex portion is provided with a monitoring avoidance hole, the NTC thermistor is arranged in the monitoring avoidance hole, the NTC thermistor is connected to the first row of wires of the FPC collection bus, and the special-shaped conductive bus is connected to the second row of wires of the FPC collection bus through the nickel sheet.

2. A structure for improving CCS temperature acquisition accuracy according to claim 1, characterized in that: The nickel sheet is composed of a conductive bar mounting portion, a soft bar mounting portion, and a connecting portion connecting the conductive bar mounting portion and the soft bar mounting portion, and the height of the connecting portion is equal to or approximately equal to the thickness of the special-shaped conductive bar.

3. The structure for improving the CCS temperature acquisition accuracy according to claim 1, characterized in that: The special-shaped conductive bar is composed of a conductive bar main body and the pressing detection protrusion integrally connected to the conductive bar main body.

4. The structure for improving the CCS temperature acquisition accuracy according to claim 1, characterized in that: The NTC thermistor is welded to the first row of wires.

5. The structure for improving the CCS temperature acquisition accuracy according to claim 1, characterized in that: The monitoring avoidance hole outside the NTC thermistor is filled with an anti-interference glue layer.

6. The structure for improving the CCS temperature acquisition accuracy according to claim 3, characterized in that: A battery core group is arranged at the bottom of the special-shaped conductive bar, a welding groove is arranged on the conductive bar body, and the pole of the battery core group is fitted with the lower part of the welding groove.

7. A structure for improving CCS temperature acquisition accuracy according to claim 6, characterized in that: The battery core group includes a plurality of battery cells, and each of the battery cells includes two poles.

8. The structure for improving the CCS temperature acquisition accuracy according to claim 7, characterized in that: The special-shaped conductive bus is electrically connected to the pole.

9. The structure for improving the CCS temperature acquisition accuracy according to claim 8, characterized in that: The plurality of battery cells are connected in series via special-shaped conductive bars.

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