CCS module adopting NTC to collect battery cell temperature

Abstract

The utility model relates to the technical field of batteries, and discloses a CCS module adopting NTC (Negative Temperature Coefficient) to collect battery cell temperature, which comprises a plurality of battery cells, and further comprises a heat conduction block correspondingly attached to the top end of a single battery cell; the second FR4 plate is mounted at the top end of the heat conduction block; the first FPC board is mounted at the top end of the second FR4 board; the NTC is located at the top end of the first FPC board, electrically connected with the first FPC board and used for collecting the temperature of the corresponding single battery cell. According to the utility model, the temperature of the battery cell can be accurately acquired.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a CCS module that uses an NTC to collect the temperature of battery cells. Background Art

[0002] The temperature condition of the battery cells inside the battery pack is a key factor to ensure its performance, which is directly related to core performance parameters such as charging efficiency, energy output density, and cycle service life. Maintaining the battery cells within an appropriate temperature range is a prerequisite for ensuring the optimal performance of the battery pack; conversely, too high or too low temperature will not only weaken the battery performance but also may pose potential safety hazards.

[0003] Implementing a real-time monitoring mechanism for the temperature of battery cells is crucial for preventing serious accidents such as thermal runaway and fire of the battery pack. It can immediately identify and respond to temperature anomalies, preventing problems before they occur. Especially in the context of the rapid development of new energy vehicle fast charging technology, the fast charging process will cause the temperature of the battery cells to change rapidly. At this time, accurate temperature measurement becomes particularly important because any deviation may lead to a significant reduction in charging efficiency, overheating of the battery cells, and even trigger dangerous thermal runaway events.

[0004] Currently, in the field of battery pack battery cell temperature collection technology, a scheme of collecting the temperatures of multiple battery cells through nickel sheets in the CCS module is generally adopted. In this process, the heat of all battery cells is first conducted to the battery cell terminal posts respectively, and then all the heat is conducted from the battery cell terminal posts to the aluminum bar, and finally transferred to the nickel sheet for temperature sensing. However, when the temperature is conducted to the aluminum bar, the overall area of the aluminum bar is relatively large, and affected by the fact that the aluminum bar itself is made of aluminum, the heat absorption capacity of the aluminum bar is relatively strong. In this way, when the heat transferred from the battery cells is transmitted to the nickel sheet through the aluminum bar, the heat attenuation is fast and large, resulting in a large difference between the temperature sensed by the nickel sheet and the actual temperature of the battery cells. At the same time, since there are multiple battery cells on the battery pack and the aluminum bar directly covers all the battery cells, the temperatures of all the battery cells are directly transmitted to the same aluminum bar. This leads to the fact that when using the nickel sheet to detect the actual temperature of the battery cells, the detected is the average temperature of all the battery cells. Once the temperature of a certain battery cell is abnormal, the nickel sheet cannot timely and accurately obtain whether a certain battery cell is in an abnormal state. Summary of the Utility Model

[0005] An embodiment of the utility model provides a CCS module that uses an NTC to collect the temperature of battery cells, which can solve the problem of inaccurate measurement of battery cell temperature.

[0006] The embodiments of the present utility model adopt the following technical solutions: A CCS module that uses an NTC to collect the temperature of battery cells, including multiple battery cells, further including: a heat conduction block, correspondingly attached to the top of a single battery cell; a second FR4 board, installed on the top of the heat conduction block; a first FPC board, installed on the top of the second FR4 board; an NTC, located on the top of the first FPC board and electrically connected to the first FPC board, for collecting the temperature of the corresponding single battery cell.

[0007] Beneficial effects: The structure of this solution is different from that of the prior art. This solution can collect the temperature of the battery cells more accurately. There are multiple battery cells in the battery pack. In this solution, a heat conduction block is attached to a certain battery cell, transferred from the heat conduction block to the second FR4 board, then to the first FPC board, and finally collected by the NTC, realizing the direct collection of the actual temperature of the battery cell by the NTC, and it can be applied to collect each battery cell one by one. Moreover, the error between the temperature collected by the NTC and the actual temperature of the battery cell is within 2°C.

[0008] Preferably, it further includes: a second bracket, fixedly installed on the top of the battery cell; a first bracket, installed on the top of the second bracket; a first FR4 board, installed on the top of the second FPC board; a first through hole for the heat conduction block to pass through is opened on the second bracket, and a second through hole matching the first through hole is opened on the first bracket, and the heat conduction block passes through the first through hole and is located in the second through hole; the bottom of the first FPC board covers the second through hole; the second FR4 board is located in the gap between the first FPC board and the heat conduction block.

[0009] Beneficial effects: First of all, this solution can not only collect the temperature of the battery cells more accurately, but also ensure the structural strength of the CCS module. Through the layered protection of the first bracket, the second bracket, the first FR4 board and the second FPC board, the structural strength of the entire CCS module can be enhanced, and the NTC and the heat conduction block can be better protected. Secondly, the actual temperature of the battery cell is transferred to the heat conduction block and the second FR4 board in the first through hole and the second through hole, and then transferred from the second FR4 board to the first FPC board, and the NTC can achieve collection. Such a heat conduction method will not be absorbed by larger components such as the first bracket, the second bracket and the second FPC board, and in terms of conduction, it can be said that it is transferred to the NTC with relatively small loss, further improving the measurement accuracy.

[0010] Preferably, the heat conduction block is heat-conducting silica gel.

[0011] Beneficial effects: Heat-conducting silica gel is not only affordable, but also has strong heat conductivity, and is suitable for the environments of electronic components and interfaces with various shapes. Whether it is a plane or an irregular surface, it can be closely attached.

[0012] Preferably, the first bracket is an injection-molded bracket.

[0013] Beneficial effects: The injection-molded bracket has good strength and stability.

[0014] Preferably, the second bracket is a blister bracket.

[0015] Beneficial effects: The blister bracket is lighter and has a relatively low cost. The structure of the blister bracket is relatively simple and suitable for mass production.

[0016] Preferably, the first FPC board and the NTC are connected by welding.

[0017] Beneficial effects: Welding has high durability and also has good seismic performance.

[0018] Preferably, it further includes heat riveting posts; the first FR4 board, the second FPC board, the first FPC board and the first bracket are connected by heat riveting posts.

[0019] Beneficial effects: The connection by heat riveting posts is more reliable than welding, and can make the connection between the first FR4 board, the second FPC board, the first FPC board and the first bracket more firm and reliable.

[0020] Preferably, the thickness of the thermal conductive silicone is 4 mm.

[0021] Beneficial effects: Due to the elastic deformation of the thermal conductive silicone, when the top of the thermal conductive silicone is abutted by the second FR4 board, the thermal conductive silicone will deform to a certain extent; when the thickness of the thermal conductive silicone is less than 4 mm and is abutted by the second FR4 board, under a certain amount of deformation, during the process of handling the battery pack, an irregular force will be generated on the thermal conductive block, and this force will cause the thermal conductive silicone to deform again. At this time, since the thickness of the thermal conductive silicone is too small, the thermal conductive silicone is easily deformed to the limit and it is difficult to continue to buffer the battery cell and the NTC. Therefore, it is necessary to ensure that the thickness of the thermal conductive silicone is at least 4 mm so that the thermal conductive silicone can better play a buffering role during the process of handling the battery pack. When the thickness of the thermal conductive silicone is greater than 4 mm, it will increase the weight of the CCS module, and at the same time increase the material cost and the corresponding production cost.

[0022] Preferably, the thickness of the second FR4 board is 0.2 mm.

[0023] Beneficial effects: If the thickness of the FR4 board is too large, it will cause an increase in the overall thickness of the CCS module and absorb more heat. If the thickness of the FR4 is too small, when the FR4 board is used as a welding plate, it is not firm.

[0024] Preferably, the thickness of the first FR4 board is 2 mm.

[0025] Beneficial effects: The first FR4 board is used to protect the NTC. When its thickness is less than 2 mm, the seismic resistance is insufficient; when it is greater than XX mm, it will increase the weight of the CCS module, and also increase the material cost and the corresponding production cost.

[0026] Beneficial effects of the embodiments of the present utility model

[0027] First, compared with the prior art solution of collecting the temperature of the battery cells through the nickel sheets in the CCS module, this mechanism of collecting the average temperature of all the battery cells inevitably causes the attenuation and distortion of the temperature signal on a single battery cell. The structure of this embodiment is different from that of the prior art. This embodiment can not only ensure the structural strength of the CCS module, but also collect the temperature of the battery cells more accurately.

[0028] Second, the battery cell transfers the temperature to the heat conduction block, and the loss of this temperature is extremely small. Then it is transferred to the second FR4 board. In the prior art, the thickness of the FR4 board is extremely thin, and the damage to the temperature caused by both the FR4 board and the heat conduction block can be ignored. Therefore, by collecting the temperature of the battery cell through the NTC, an effect similar to direct collection can be achieved.

[0029] At the same time, through the layer-by-layer protection of the blister bracket, injection molding bracket and the first FR4 board, the structural strength of the entire CCS module can be enhanced, and the NTC and the heat conduction block can be better protected. Description of the drawings

[0030] Figure 1 The front view of a CCS module that uses an NTC to collect the temperature of the battery cells in an embodiment;

[0031] Figure 2 For Figure 1 The partial enlarged schematic diagram;

[0032] Figure 3 The structural schematic diagram (a) of a CCS module that uses an NTC to collect the temperature of the battery cells in an embodiment;

[0033] Figure 4 The structural schematic diagram (b) of a CCS module that uses an NTC to collect the temperature of the battery cells in an embodiment. Detailed implementation manners

[0034] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0035] The reference numerals in the attached drawings of the specification include:

[0036] The first FR4 board 1, NTC 2, the first FPC board 3, heat riveting posts 4, injection molding bracket 5, the second FR4 board 6, blister packaging bracket 7, thermal conductive silica gel 8, battery cell 9, the second FPC board 10.

[0037] Further explanations are given for some terms in the specific embodiments:

[0038] FPC board: Refers to a flexible printed circuit board, also known as a flexible circuit board, flexible wiring board or flexible printed circuit. It is a printed circuit board with high reliability and excellent flexibility, mainly made of flexible copper clad laminates such as polyimide or polyester film.

[0039] FR4 board: Also known as "glass fiber reinforced epoxy resin board" or "glass fiber board". It is mainly made of epoxy resin and glass fiber cloth through hot pressing or lamination processes. FR4 is widely used in manufacturing circuit boards (also known as "PCB" or "mother board") of various electronic devices due to its excellent electrical properties, mechanical strength, heat resistance and moisture resistance.

[0040] NTC: NTC is a thermistor, which is a semiconductor device whose resistance value decreases as the temperature increases. They are usually used in applications such as temperature measurement, temperature control, and temperature compensation. Since the resistance value of the NTC thermistor is very sensitive to temperature, they can measure temperature very accurately.

[0041] Embodiment

[0042] As Figure 1 、 2 and shown in 3, this embodiment provides a CCS module that uses an NTC to collect the temperature of the battery cell 9, which sequentially includes a first FR4 board, a second FPC board, NTC 2, the first FPC board, a first bracket, the second FR4 board, a second bracket, a heat conducting block and the battery cell 9 from top to bottom. In this embodiment, the first bracket is the injection molding bracket 5, and the second bracket is the blister packaging bracket 7. In the prior art, the CCS module also includes a battery cell terminal post. The battery cell terminal post is installed on the battery cell 9, and the battery cell terminal post and the second FPC board can be fixedly connected by bolts. In this embodiment, the first FPC board and the second FPC board are made of the same material, only differing in shape and size. In this embodiment, the heat conducting block is the thermal conductive silica gel 8. A separate thermal conductive silica gel 8, the second FR4 board 6 and NTC 2 are correspondingly arranged on each battery cell 9.

[0043] Specifically, the bottom end of the thermal conductive silicone 8 is adhered to the top end of the battery cell 9, and the plastic suction bracket 7 is fixedly installed on the battery cell 9, and this fixed installation method is a prior art. The thermal conductive silicone 8 is located between the battery cell 9 and the plastic suction bracket 7. The top of the thermal conductive silicone 8 abuts against the bottom of the plastic suction bracket 7. A first through hole is formed in the plastic suction bracket 7, and the first through hole is directly opposite to the top of the heat conduction block, and the area of the first through hole is just large enough for the heat conduction block to pass through the first through hole.

[0044] The injection molding bracket 5 is fixedly installed on the plastic suction bracket 7, and its fixing method is a prior art. A second through hole is formed in the injection molding bracket 5, and the second through hole is directly opposite to the heat conduction block. The heat conduction block does not pass through the second through hole but is located inside the second through hole and is surrounded by the second through hole. The top of the heat conduction block abuts against the lower end of the second FR4 board. The upper end of the second FR4 board is welded to the first FPC board, and the first FPC board is pressed against the injection molding bracket 5.

[0045] Specifically, the first FPC board is pressed against the injection molding bracket 5 and covers the second through hole on the injection molding bracket 5. A second FR4 board is arranged in the gap between the first FPC board and the heat conduction block. The second FR4 board is located inside the second through hole, and its top is welded to the first FPC board and its bottom abuts against the top of the heat conduction block.

[0046] The top of the second FR4 board is fixedly connected to the bottom of the NTC2, the top of the NTC2 is fixedly connected to the second FPC board, and the top of the second FPC board is pressed against the first FR4 board.

[0047] A CCS module that uses an NTC to collect the temperature of the battery cell 9 further includes 2 thermal riveting posts 4. First positioning holes for the thermal riveting posts 4 to pass through are provided at the left and right ends of the first FR4 board, second positioning holes for the thermal riveting posts 4 to pass through are provided at the left and right ends of the second FPC board, third positioning holes for the thermal riveting posts 4 to pass through are provided at the left and right ends of the first FPC board, and the openings of the first positioning holes, the second positioning holes, and the third positioning holes match. Fourth positioning holes are provided at both ends of the injection molding bracket 5. The fourth positioning hole is not a through hole but a connection point for thermal riveting connection between the thermal riveting post 4 and the injection molding bracket 5. The thermal riveting post 4 passes through the first positioning hole, the second positioning hole, and the third positioning hole, so that a thermal riveting connection is formed among the first FR4 board, the second FPC board, the first FPC board, and the injection molding bracket 5.

[0048] As Figure 4 shown, the thickness of the thermal conductive silicone 8 is a, and a = 4 mm. The thickness of the first FR4 board is b, and b = 2 mm. The thickness of the second FR4 board is 0.2 mm. The second FR4 board abuts against the lower surface of the first FPC board and is used as a positioning point for welding and fixing the NTC2 to the first FPC board.

[0049] In this embodiment, pasting is a prior art that uses a viscous jelly-like substance to paste between two objects to achieve a close-fitting effect. The heat-conducting block is heat-conducting silica gel 8, and the heat-conducting silica gel 8 has a cuboid structure.

[0050] The actual temperature of the battery cell 9 is conducted into the heat-conducting silica gel 8, then conducted from the heat-conducting silica gel 8 to the second FR4 board, and then conducted from the second FR4 board to the first FPC board. The first FPC board conducts to the NPC, completing the measurement of the actual temperature of the battery cell 9 by the NPC. Since the thickness of the heat-conducting silica gel 8 is 4 mm, its thickness is small, and based on the properties of silica gel, its heat transfer ability is strong and the heat loss is small. The thickness of the second FR4 board is only 0.2 mm, which is relatively thin, and its volume is small, so the heat loss can be ignored. Then it is conducted to the first FPC board. The existing first FPC board is relatively thin, and its heat loss is small. Therefore, through such a transmission path, the direct collection of a certain battery cell 9 among multiple battery cells 9 in the CCS module can be realized, and the heat loss is small and the measurement accuracy is high.

[0051] Test example

[0052] According to the technical content of the embodiment, a test comparison is made with the prior art, and 10 tests are carried out, and the obtained results are the average values. The embodiment provides a CCS module that uses an NTC to collect the temperature of the battery cell. The prior art is the same as in the background art, and the prior art collects the temperature of the battery cell 9 through the nickel sheet in the CCS module.

[0053] Table 1 The corresponding measurement of the actual temperature of the battery cell in the embodiment and the prior art

[0054]

[0055] As shown in Table 1, compared with the prior art, the solution of the embodiment can accurately collect the actual temperature of the battery cell 9, and the difference between the collected temperature and the actual temperature of the battery cell 9 is less than 2 °C.

[0056] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0057] It should be understood that the term "and / or" used herein is merely a description of the same fields of related objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally indicates that the related objects before and after are in an "or" relationship.

[0058] Although the subject matter has been described in language specific to structural features and / or method logical acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. On the contrary, the specific features and acts described above are merely example forms for implementing the claims.

[0059] The above are only embodiments of the present utility model. Specific structures and characteristics and other common knowledge that are already known in the solution are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the utility model belongs before the application date or the priority date, are able to know all the prior art in this field, and have the ability to apply the conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to complete and implement this solution. Some typical well-known structures or well-known methods should not be an obstacle to those of ordinary skill in the art in implementing this application. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners and other records in the specification can be used to interpret the content of the claims.

Claims

1. A CCS module using NTC to collect battery core temperature, comprising a plurality of battery cells, characterized in that: Also includes: The heat conductive block is correspondingly attached to the top of a single battery cell; The second FR4 board is mounted on the top of the thermal block; A first FPC board is mounted on top of the second FR4 board; The NTC is located at the top of the first FPC board and is electrically connected to the first FPC board, and is used to collect the temperature of the corresponding single battery cell.

2. A CCS module using NTC to collect core temperature according to claim 1, characterized in that: Also includes: A second bracket is fixedly mounted on the top of the battery cell; A first bracket is mounted on the top of the second bracket; A first FR4 board is mounted on top of the second FPC board; The second bracket is provided with a first through hole for the heat-conducting block to pass through, the first bracket is provided with a second through hole matching the first through hole, the heat-conducting block passes through the first through hole and is located in the second through hole; the bottom of the first FPC board covers the second through hole; the second FR4 board is located in the gap between the first FPC board and the heat-conducting block.

3. A CCS module using NTC to collect core temperature according to claim 1, characterized in that: The heat conducting block is made of thermally conductive silicone.

4. A CCS module using NTC to collect core temperature according to claim 2, characterized in that: The first bracket is an injection-molded bracket.

5. The CCS module using NTC to collect core temperature according to claim 2, characterized in that: The second bracket is a blister bracket.

6. A CCS module using NTC to collect core temperature according to claim 1, characterized in that: The first FPC board and the NTC are connected by welding.

7. The CCS module using NTC to collect core temperature according to claim 2, characterized in that: It also includes thermal rivet columns; the first FR4 board, the second FPC board, the first FPC board and the first bracket are connected by thermal rivet columns.

8. The CCS module using NTC to collect core temperature according to claim 3, characterized in that: The thickness of the thermal conductive silicone is 4mm.

9. The CCS module using NTC to collect core temperature according to claim 1, characterized in that: The thickness of the second FR4 board is 0.2 mm.

10. The CCS module using NTC to collect core temperature according to claim 1, characterized in that: The thickness of the first FR4 board is 2 mm.

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