Novel temperature sensing structure for collecting temperature of battery cell

Abstract

The utility model relates to the technical field of cell temperature monitoring, in particular to a novel temperature sensing structure for collecting cell temperature, which comprises an FPC (flexible printed circuit) board, an epoxy board, an injection molding board, a heat conduction pad and a temperature sensor, and is characterized in that the FPC board is clamped and fixed between the epoxy board and the injection molding board; the heat conduction pad is arranged on the injection molding plate, the top end of the heat conduction pad abuts against the bottom end of the FPC board, and the bottom end of the heat conduction pad is used for abutting against the top end of a battery cell top cover; the temperature sensor is arranged on the epoxy board, and the bottom end of the temperature sensor abuts against the top end of the FPC board; the utility model provides a novel temperature sensing structure for acquiring the temperature of a battery cell, and aims to directly acquire the temperature from an FPC (Flexible Printed Circuit) so as to more accurately reflect the real temperature of the battery cell and reduce the fault rate of temperature sensing. The problem that a traditional temperature sensing structure adopted in an existing fast charging system cannot accurately reflect the actual temperature of a battery cell is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery cell temperature monitoring technology, and in particular to a novel temperature sensing structure for collecting battery cell temperature. Background Technology

[0002] In the field of new energy, the safety, performance, and reliability of battery packs largely depend on the accurate monitoring of cell temperature. The importance of cell temperature acquisition is reflected in four aspects: safety protection, performance optimization, state estimation, and fault prevention.

[0003] like Figure 1 As shown, the traditional method for acquiring cell temperature is to place a temperature sensor on the FPC (where the nickel sheet has a window), fix it by soldering and filling it with UV glue, and then use the nickel sheet to acquire the temperature of the aluminum foil.

[0004] In fast charging systems (such as 3C, 4C, 5C, etc.), high current causes the aluminum bar temperature to rise rapidly. Using a traditional temperature sensing structure has some drawbacks: the temperature sensor collects the temperature of the aluminum bar through a nickel plate, which can easily lead to an overestimation of the measured temperature and cannot accurately reflect the true temperature of the battery cell. Utility Model Content

[0005] In view of this, this utility model proposes a novel temperature sensing structure for collecting battery cell temperature, aiming to directly collect temperature from the FPC, thereby more accurately reflecting the true temperature of the battery cell and reducing the failure rate of the temperature sensor. This solves the problem that traditional temperature sensing structures used in existing fast charging systems cannot accurately reflect the actual temperature of the battery cell.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides a novel temperature sensing structure for collecting battery cell temperature, including an FPC board, an epoxy board, an injection-molded board, a thermal pad, and a temperature sensor.

[0008] The FPC board is clamped and fixed between the epoxy board and the injection molded board;

[0009] The thermal pad is disposed on the injection molding plate, the top end of the thermal pad abuts against the bottom end of the FPC plate, and the bottom end of the thermal pad is used to abut against the top end of the battery cell top cover;

[0010] The temperature sensor is mounted on the epoxy board, with its bottom end abutting against the top end of the FPC board.

[0011] Based on the above technical solutions, preferably, the injection molding plate is provided with receiving holes, wherein,

[0012] The thermal pad is fitted into the receiving hole with a gap.

[0013] Preferably, on the basis of the above technical solutions, the epoxy plate is provided with an implantation hole, wherein,

[0014] The implantation hole is coaxially arranged with the accommodation hole;

[0015] The temperature sensor is fixed to the inside of the implantation hole.

[0016] Preferably, on the basis of the above technical solutions, the FPC plate is provided with a mounting portion, wherein,

[0017] One end of the mounting portion is bent downward to form a vertical portion, and one end of the vertical portion is bent upward to form a horizontal portion;

[0018] The horizontal portion is clamped and fixed between the epoxy plate and the injection molding plate.

[0019] Preferably, on the basis of the above technical solutions, the vertical portion and the horizontal portion are arranged in a T shape.

[0020] Preferably, on the basis of the above technical solutions, the epoxy plate is provided with an observation hole, and the horizontal portion is provided with a matching hole, wherein,

[0021] The matching hole is coaxially arranged with the observation hole;

[0022] One end of the heat-conducting pad extends to below the matching hole in the horizontal direction.

[0023] Preferably, on the basis of the above technical solutions, the epoxy plate and the injection molding plate are fixedly connected through a first hot rivet column.

[0024] Preferably, on the basis of the above technical solutions, the epoxy plate is provided with a rivet hole, and the horizontal portion is provided with a through hole, wherein,

[0025] One end of the first hot rivet column is fixed to the injection molding plate, and the other end penetrates the through hole and the rivet hole upward.

[0026] Preferably, on the basis of the above technical solutions, the rivet hole and the through hole are both waist-shaped holes.

[0027] Preferably, on the basis of the above technical solutions, the bracket further comprises a bracket, wherein,

[0028] The bracket is used to cover the top of the battery cell and is used to fix the aluminum bar and the FPC plate;

[0029] The bracket is provided with a clearance hole, the vertical portion penetrates the clearance hole downward, and the epoxy plate is located in the clearance hole;

[0030] The support is fixedly connected with the injection molding plate through the second hot riveting column.

[0031] The temperature sensing structure for collecting the temperature of the battery cell of the utility model has the following advantages over the prior art

[0032] Advantages:

[0033] (1) The top end of the heat-conducting pad is abutted against the bottom end of the FPC plate, the bottom end of the heat-conducting pad is abutted against the top end of the battery cell top cover, and the bottom end of the temperature sensor is abutted against the top end of the FPC plate, so that the temperature sensor can directly detect the temperature of the battery cell top cover through the FPC plate and the heat-conducting pad, errors caused by indirect measurement through aluminum bars in the traditional method are reduced, and the real temperature of the battery cell can be more accurately reflected.

[0034] (2) The FPC plate is clamped and fixed between the epoxy plate and the injection molding plate, and the whole structure is further reinforced through the first hot riveting column and the second hot riveting column, so that the reliability under vibration or mechanical impact is improved, and good measurement accuracy is ensured.

[0035] (3) The assembly between the components is more convenient and accurate through the hole-shaped structures such as the accommodating hole, the implantation hole and the cooperation hole, and large-scale production is facilitated.

[0036] (4) The observation hole is arranged on the epoxy plate, so that whether the heat-conducting pad is correctly installed can be checked, and later maintenance and fault checking are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0038] Figure 1 It is a temperature sensing structure schematic diagram for collecting the temperature of the battery cell of the prior art;

[0039] Figure 2 It is a perspective view of the temperature sensing structure for collecting the temperature of the battery cell of the utility model;

[0040] Figure 3 It is Figure 2 the enlarged view of point A;

[0041] Figure 4This is a perspective view of another novel temperature sensing structure for collecting battery cell temperature according to this utility model.

[0042] Figure 5 This is a partial three-dimensional view of a novel temperature sensing structure for collecting battery cell temperature according to this utility model.

[0043] Figure 6 This is a partial exploded view of a novel temperature sensing structure for collecting battery cell temperature according to this utility model;

[0044] In the diagram: 1. FPC board; 2. Epoxy board; 3. Injection molded board; 4. Thermal pad; 5. Temperature sensor; 6. Bracket; 7. Aluminum bar; 31. First hot riveting post; 32. Second hot riveting post; 101. Mounting part; 201. Implant hole; 202. Observation hole; 203. Riveting hole; 301. Receiving hole; 601. Clearance hole; 1011. Vertical part; 1012. Horizontal part; 10121. Mating hole; 10122. Through hole. Detailed Implementation

[0045] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0046] like Figures 1-6 As shown, this utility model discloses a novel temperature sensing structure for collecting battery cell temperature, comprising an FPC board 1, an epoxy board 2, an injection molded board 3, a thermal pad 4, and a temperature sensor 5.

[0047] The FPC board 1 is clamped and fixed between the epoxy board 2 and the injection molded board 3. A thermal pad 4 is disposed on the injection molded board 3, with its top end abutting against the bottom end of the FPC board 1 and its bottom end abutting against the top end of the battery cell cover. A temperature sensor 5 is disposed on the epoxy board 2, with its bottom end abutting against the top end of the FPC board 1.

[0048] During temperature measurement, the temperature sensor 5 can directly detect the temperature of the cell top cover through the FPC board 1 and the thermal pad 4, reducing the errors caused by indirect measurement through the aluminum bar in traditional methods, and can more accurately reflect the true temperature of the cell. Therefore, this temperature sensing structure is particularly suitable for fast charging environments such as 3C, 4C, and 5C, and can quickly sense temperature changes during high-current charging, promptly feeding back to the battery management system (BMS) to take appropriate measures to ensure safety.

[0049] In the aforementioned temperature-sensing structure, the injection-molded plate 3 has a receiving hole 301, in which the thermal pad 4 is fitted with a clearance fit. The epoxy plate 2 has an implantation hole 201, which is coaxially arranged with the receiving hole 301, and the temperature sensor 5 is fixed inside the implantation hole 201. This perforated structure facilitates the assembly of various components and allows the FPC plate 1 to easily contact the temperature sensor 5 and the thermal pad 4, improving the temperature measurement quality. After the temperature sensor 5 is inserted into the implantation hole 201, it is fixed by soldering and filling with UV adhesive.

[0050] In the aforementioned temperature sensing structure, an installation portion 101 is provided on the FPC board 1. One end of the installation portion 101 is bent downwards to form a vertical portion 1011, and the other end of the vertical portion 1011 is bent upwards to form a horizontal portion 1012. The vertical portion 1011 and the horizontal portion 1012 are arranged in a T-shape. In this structure, the installation portion 101 is obtained by stamping, and after stamping, it is bent to form the vertical portion 1011 and the horizontal portion 1012. From a top-view angle, the vertical portion 1011 and the horizontal portion 1012 are arranged in a T-shape, and the horizontal portion 1012 is clamped and fixed between the epoxy board 2 and the injection-molded board 3. This structure shortens the distance between the temperature sensor 5 and the battery cell end cap, which helps to shorten the heat transfer path and improve detection quality.

[0051] In the aforementioned temperature-sensing structure, an observation hole 202 is provided on the epoxy plate 2, and a mating hole 10121 is provided on the horizontal part 1012. The mating hole 10121 and the observation hole 202 are coaxially aligned, and one end of the thermal pad 4 extends horizontally to below the mating hole 10121. The observation hole 202 and the mating hole 10121 facilitate inspection of whether the thermal pad 4 is correctly installed, simplifying later maintenance and troubleshooting. Furthermore, the thermal pad 4 is a thermally conductive silicone pad. Since compressing the thermally conductive silicone pad can improve heat transfer efficiency, the thermal pad 4 under the epoxy plate 2 has a 25% compression during CCS assembly.

[0052] In the aforementioned temperature-sensitive structure, the epoxy board 2 and the injection-molded board 3 are fixedly connected by a first hot-riveting post 31. Specifically, the epoxy board 2 is provided with a riveting hole 203, and the horizontal part 1012 is provided with a through hole 10122. One end of the first hot-riveting post 31 is fixed to the injection-molded board 3 by injection molding, and the other end of the first hot-riveting post 31 extends upward through the riveting hole 203 and the through hole 10122. In this structure, the first hot-riveting post 31 is solid at room temperature. After the above structure is assembled, the first hot-riveting post 31 is heat-melted and pressed to increase the diameter of its top end to form a mortise, thereby riveting the epoxy board 2 and the injection-molded board 3.

[0053] In addition, both the rivet hole 203 and the through hole 10122 are oblong holes, providing adjustment space and facilitating fine-tuning in actual operation.

[0054] In addition, the aforementioned temperature-sensing structure also includes a bracket 6, which covers the top of the battery cell and is used to fix the aluminum core 7 and the FPC board 1. The bracket 6 is provided with a clearance hole 601, through which the vertical portion 1011 extends downwards, and the epoxy board 2 is located within the clearance hole 601. The bracket 6 and the injection-molded board 3 are fixedly connected by a second hot-riveting post 32.

[0055] The injection molded plate 3 is provided with a second hot riveting post 32 at both ends. The second hot riveting post 32 at one end is used for the fixed connection between the injection molded plate 3 and the bracket 6, and the second hot riveting post 32 at the other end is used for the fixed connection between the injection molded plate 3 and the aluminum bar 7.

[0056] The method of using the novel temperature sensing structure for collecting battery cell temperature according to this utility model is as follows:

[0057] The injection-molded plate 3 is fixed to the bottom surface of the bracket 6. Then, the receiving hole 301 is inserted into the thermal pad 4, with the lower end of the thermal pad 4 contacting the cell end cap. The FPC plate 1 is installed on the top surface of the bracket 6. During installation, the mounting part 101 of the FPC plate 1 is placed into the clearance hole 601 of the bracket 6. An epoxy plate 2 is installed on the mounting part 101. The temperature sensor 5 is fixed to the implantation hole 201, with the lower end of the temperature sensor 5 contacting the top surface of the FPC plate 1. During temperature measurement, the temperature sensor 5 can directly detect the temperature of the cell top cap through the FPC plate 1 and the thermal pad 4, reducing the error caused by indirect measurement via aluminum foil in traditional methods and more accurately reflecting the true temperature of the cell.

[0058] The above are merely preferred embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel temperature sensing structure for collecting battery cell temperature, comprising an FPC board (1), characterized in that: It also includes an epoxy board (2), an injection-molded board (3), a thermal pad (4), and a temperature sensor (5), among which, The FPC board (1) is clamped and fixed between the epoxy board (2) and the injection molded board (3); The thermal pad (4) is disposed on the injection molding plate (3), the top end of the thermal pad (4) abuts against the bottom end of the FPC plate (1), and the bottom end of the thermal pad (4) is used to abut against the top end of the battery cell top cover; The temperature sensor (5) is disposed on the epoxy board (2), and the bottom end of the temperature sensor (5) abuts against the top end of the FPC board (1).

2. The novel temperature sensing structure for collecting battery cell temperature as described in claim 1, characterized in that: The injection molding plate (3) is provided with a receiving hole (301), wherein, The thermal pad (4) is fitted into the receiving hole (301) with a gap.

3. The novel temperature sensing structure for collecting battery cell temperature as described in claim 2, characterized in that: The epoxy board (2) is provided with implantation holes (201), wherein, The implantation hole (201) and the receiving hole (301) are coaxially arranged; The temperature sensor (5) is fixed inside the implantation hole (201).

4. The novel temperature sensing structure for collecting battery cell temperature as described in claim 1, characterized in that: The FPC board (1) is provided with a mounting part (101), wherein, One end of the mounting part (101) is bent downward to form a vertical part (1011), and one end of the vertical part (1011) is bent upward to form a horizontal part (1012); The horizontal part (1012) is clamped and fixed between the epoxy board (2) and the injection molded board (3).

5. The novel temperature sensing structure for collecting battery cell temperature as described in claim 4, characterized in that: The vertical portion (1011) and the horizontal portion (1012) are arranged in a T-shape.

6. The novel temperature sensing structure for collecting battery cell temperature as described in claim 4, characterized in that: An observation hole (202) is provided on the epoxy board (2), and a mating hole (10121) is provided on the horizontal part (1012). The mating hole (10121) and the observation hole (202) are coaxially arranged; One end of the thermal pad (4) extends horizontally to below the mating hole (10121).

7. The novel temperature sensing structure for collecting battery cell temperature as described in claim 4, characterized in that: The epoxy board (2) and the injection molded board (3) are fixedly connected by the first hot riveting post (31).

8. The novel temperature sensing structure for collecting battery cell temperature as described in claim 7, characterized in that: The epoxy board (2) is provided with rivet holes (203), and the horizontal part (1012) is provided with through holes (10122), wherein, One end of the first hot riveting post (31) is fixed on the injection molding plate (3), and the other end extends upward through the through hole (10122) and the riveting hole (203).

9. The novel temperature sensing structure for collecting battery cell temperature as described in claim 8, characterized in that: Both the rivet hole (203) and the through hole (10122) are waist-shaped holes.

10. The novel temperature sensing structure for collecting battery cell temperature as described in claim 4, characterized in that: It also includes a support (6), wherein, The bracket (6) is used to cover the top of the battery cell and to fix the aluminum bar (7) and the FPC board (1); The bracket (6) is provided with a clearance hole (601), the vertical part (1011) extends downward through the clearance hole (601), and the epoxy board (2) is located in the clearance hole (601); The bracket (6) and the injection molded plate (3) are fixedly connected by the second hot riveting post (32).

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