Temperature collection assembly, FPC, collection module and battery module

Abstract

The utility model discloses a temperature collecting assembly, an FPC, a collecting module and a battery module. Wherein the temperature collecting assembly comprises a thermistor and a flexible heat conduction piece; the thermistor is fixedly connected to the flexible circuit board main body; the flexible heat conduction piece is connected to the upper part of the battery cell top cover and is arranged corresponding to the thermistor in position; and the thermistor collects the temperature of the battery cell module through the flexible heat conduction piece. According to the temperature collecting assembly, the corresponding FPC, the temperature collecting module and the battery module, the temperature collecting assembly directly collects the temperature of the battery cell top cover, the collecting path is short, and compared with a traditional scheme of collecting the temperature of a busbar through a nickel sheet, the temperature collecting path is short, and delay is low.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, and in particular to a temperature collection component, an FPC, a collection module and a battery module. Background Art

[0002] With the rapid development of the new energy industry, power battery systems have become the main power source for new energy vehicles. Their performance has attracted much attention and has become the focus of development in this industry. Lithium-ion batteries have many advantages, such as high specific energy, high specific power, long life cycle, low self-discharge rate, energy saving and environmental protection. The service life and capacity attenuation of the battery are closely related to the temperature difference and temperature change amplitude of the battery module during charging and discharging. At the same time, in order to provide a basis for the safe use and life optimization of the battery system, it is necessary to monitor the working status of the power battery pack in real time and accurately, and collect data such as the battery voltage and temperature. At present, many companies in the industry use flexible circuit boards to set thermistors, fix them on nickel sheets, and collect the temperature of the nickel sheets. The temperature is transmitted to the bus through the battery cell, and then to the nickel sheet through the bus. This collection method cannot accurately reflect the real temperature of the battery cell. On the other hand, the temperature collection path is long, and the collected temperature change has a large lag. In addition, as the performance requirements of vehicle manufacturers for high-rate fast charging and high-power output are growing, under the charging and discharging conditions with a rate exceeding 1C, the temperature rise of the bus and the temperature rise of the battery itself will be very different. The collected temperature does not match the internal temperature of the battery, affecting the discharge power of the battery module, and then affecting the performance of the battery module. Therefore, more accurate collection of battery temperature plays a fundamental and key role in promoting the design of battery system thermal management strategies and optimizing the performance and cycle life of power battery packs.

[0003] Therefore, there is an urgent need to improve the current temperature collection method to solve the existing technical problems in the industry. Utility Model Content

[0004] In view of the technical problems pointed out in the above background technology that the current temperature acquisition has a large lag and a large difference with the actual temperature of the battery cell, the purpose of the utility model is to provide a temperature acquisition component, FPC, acquisition module and battery module.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] A first aspect of the present application provides a temperature collection component, including a thermistor and a flexible heat conductor;

[0007] The thermistor is fixedly connected to the flexible circuit board body;

[0008] The flexible heat-conducting member is connected above the top cover of the battery cell and is arranged at a position corresponding to the thermistor; the thermistor collects the temperature of the battery cell module through the flexible heat-conducting member.

[0009] Further, it also includes a top reinforcement plate and a bottom reinforcement plate;

[0010] The top reinforcing plate is fixedly connected to the module bracket, and an avoidance hole is provided at the fixed connection, through which the thermistor is wrapped in a return shape, and the height of the top reinforcing plate is higher than the thermistor;

[0011] The bottom reinforcing plate is connected between the flexible circuit board body and the flexible heat conductive member and is located corresponding to the thermistor.

[0012] Furthermore, the flexible heat-conducting member is a heat-conducting silicone pad, and its thickness is greater than the gap between the module bracket and the battery cell top cover.

[0013] A second aspect of the present application provides an FPC, comprising a flexible circuit board body, and the temperature collection component and nickel sheet as described above connected to the flexible circuit board body.

[0014] Furthermore, the temperature collection component is connected to the first cantilever beam of the flexible circuit board body, and the nickel sheet is connected to the second cantilever beam of the flexible circuit board body and to the bus bar for collecting the voltage of the battery module.

[0015] Furthermore, the first cantilever beam and the second cantilever beam are both S-shaped.

[0016] A third aspect of the present application provides a collection module, including a module bracket, a bus connected to the module bracket, and the FPC as described above.

[0017] Furthermore, the module bracket is provided with a flexible heat conductive component avoidance hole at the position corresponding to the temperature collection component, which is used for the flexible heat conductive component to pass through the module bracket and contact the battery cell top cover; the bus is electrically connected to the battery cell pole and is used for series connection of multiple battery cells in the battery module.

[0018] A fourth aspect of the present application provides a battery module, including a battery cell module, a collection module and an upper cover assembly;

[0019] The battery cell module is connected to the upper collection module, and the collection module is connected to the upper cover assembly.

[0020] Furthermore, the upper cover assembly includes a module upper cover and foam;

[0021] The module upper cover is provided with a downward protrusion at the position corresponding to the temperature collection component, the lower surface of the protrusion is in contact with the upper surface of the top reinforcement plate in the temperature collection component, the upper surface of the protrusion is provided with foam and the upper surface of the foam is in contact with the battery box upper cover.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. The present application provides a temperature collection component and a corresponding FPC, a temperature collection module and a battery module. The temperature collection component directly collects the temperature of the top cover of the battery cell, and the collection path is short. Compared with the traditional solution of collecting the bus temperature through a nickel sheet, the temperature collection path is short and the delay is low. The temperature collection component is placed between the module cover and the top cover of the battery cell. The module cover provides pressure to the collection module to keep the temperature collection component and the top cover of the battery cell in contact, so that the temperature of the battery cell can be collected more accurately, solving the technical problems of large hysteresis in temperature collection and large difference from the actual temperature of the battery cell, and providing information data basis for the thermal management control strategy and cycle life optimization of the battery system. In addition, the temperature collection component compression scheme provided by the present application utilizes the compression force provided by the buffer foam between the battery case cover and the battery case cover and the battery module, and realizes the compression of the temperature collection component by designing the foam and its position and the protruding part of the downward protruding structure of the module cover. Compared with some solutions in the industry that add a compression structure specifically for the temperature collection component in the module, it reduces the types and quantities of parts and saves more cost and space.

[0024] 2. This application provides an FPC and acquisition module for power battery temperature and voltage acquisition, which can accurately acquire the temperature of the battery cell while ensuring the high integration, high reliability, high scalability and low cost of the temperature and voltage acquisition module, thereby improving the integration degree and production efficiency of the battery module and reducing weight and cost;

[0025] 3. The present application provides a collection module, including an FPC, a bus and a module bracket. The temperature collection component and the flexible circuit board contained in the FPC are the main components for directly collecting the battery cell temperature. The temperature collection component is mainly composed of a top reinforcement plate, a thermistor, a bottom reinforcement plate and a thermal pad. Compared with the temperature collection component solutions in the industry, it has the following advantages: the temperature collection component is provided with double-layer reinforcement plates at the top and bottom of the thermistor for protection. Compared with some solutions in the industry that use a single-layer reinforcement plate to protect the thermistor, the structural strength around the thermistor is enhanced, making temperature collection more reliable. The thinner design of the bottom reinforcement plate does not reduce the performance of heat conduction while reinforcing the temperature collection component. At the same time, the bottom flexible thermal conductor has both thermal conductivity and buffering functions. The above design enables the temperature collection module to quickly, accurately and reliably collect the battery cell temperature under various impact and vibration conditions.

[0026] 4. The temperature collection component, nickel sheet and flexible circuit board provided in this application are all connected by an "S-shaped" cantilever beam. For the cyclic expansion of long-life battery cells, the "S-shaped" cantilever beam can absorb certain dimensional changes, reduce the pulling of the flexible circuit board by the expansion force in the length direction of the module, and provide structural reliability for monitoring the battery cell temperature and voltage data throughout the life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a battery module provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the exploded structure of a battery module provided in an embodiment of the present application;

[0029] In the figure, the battery cell module 1, the collection module 2, the upper cover assembly 3, the module upper cover 301, the foam 302, the module bracket 201, the bus 202, the FPC 203, the battery cell top cover 101, the battery cell pole 102, and the temperature collection assembly 2031;

[0030] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0031] In the figure, the protrusion 3011 and the button 3012;

[0032] Figure 4 A schematic diagram of the structure of the acquisition module provided in the embodiment of the present application;

[0033] Figure 5 for Figure 4 The enlarged structural diagram at B in the middle;

[0034] Figure 6 A schematic diagram of the structure of the FPC provided in the embodiment of the present application;

[0035] In the figure, the flexible circuit board body 2032, the nickel sheet 2033, and the second cantilever beam 20322;

[0036] Figure 7 for Figure 6 Schematic diagram of the explosion structure at point C in the middle;

[0037] In the figure, a first cantilever beam 20321, a thermistor 20311, a top reinforcement plate 20312, a bottom reinforcement plate 20313, a flexible heat conductor 20314, a mounting hole 203121, an avoidance hole 203123, and an observation hole 203122;

[0038] Figure 8 A schematic diagram of a top view of a battery module provided in an embodiment of the present application;

[0039] Fig. 9 for Figure 8 Middle DD cutaway diagram;

[0040] Fig.10 for Fig. 9 The enlarged structural diagram at E in the middle;

[0041] Fig.11 A schematic diagram of the bottom structure of the acquisition module provided in an embodiment of the present application;

[0042] Fig.12 for Fig.11 The enlarged structural diagram at F in the middle;

[0043] In the figure, the flexible heat conductive part avoids the hole 2011. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0047] like Figure 1-Figure 12 The figure is a schematic diagram of the structure of an embodiment of the present application.

[0048] Example 1

[0049] This embodiment provides a temperature collection component, including a thermistor 20311 and a flexible heat conductive member 20314;

[0050] The thermistor 20311 is fixedly connected to the flexible circuit board body 2032;

[0051] The flexible heat-conducting member 20314 is connected to the top of the battery cell cover 101 and is arranged at a position corresponding to the thermistor 20311 ; the thermistor 20311 directly collects the temperature of the battery cell module 1 through the flexible heat-conducting member 20314 .

[0052] Compared with the traditional solution of collecting bus temperature through nickel sheets, this structural setting has a short temperature collection path, low delay, and can collect the temperature of the battery cell more accurately.

[0053] In addition, in a preferred embodiment, it further includes a top reinforcing plate 20312 and a bottom reinforcing plate 20313; the top reinforcing plate 20312 is fixedly connected to the module bracket 201, and an avoidance hole 203123 is provided at the fixed connection, through which the thermistor 20311 is wrapped in a return shape, and the height of the top reinforcing plate 20312 is higher than the thermistor 20311;

[0054] The bottom reinforcing plate 20313 is connected between the flexible circuit board body 2032 and the flexible heat conductive member 20314 and is located corresponding to the thermistor 20311 .

[0055] It should be noted that the thermistor 20311 is fixed to the flexible circuit board body 2032 by welding, and a top reinforcement plate 20312 and a bottom reinforcement plate 20313 are respectively provided on the top and bottom for protection, and can be connected by adhesive, and the flexible heat conductive member 20314 is placed at the bottom of the bottom reinforcement plate 20313 and can be bonded by adhesive; the top reinforcement plate 20312 is provided with a mounting hole 203121 fixed by hot riveting to realize the connection and fixation of the entire temperature collection component 2031 and the module bracket 201, and its The height is higher than the thermistor 20311, and an avoidance hole 203123 is provided on the thermistor 20311 to protect it by wrapping it in a reverse shape, and the exposed part of the thermistor 20311 is protected by glue. At the same time, an observation hole 203122 is provided to check the installation status of the incoming material of the flexible thermal conductive member 20314, so as to avoid the risk of the production staff not discovering that the incoming material of the flexible thermal conductive member 20314 falls off and the acquisition module is welded and fixed to the module, and the offline test cannot collect the battery cell temperature, resulting in the risk of module repair problems;

[0056] In a preferred embodiment, the top reinforcement plate 20312 can be made of FR4 material, which has high mechanical strength, good flame retardancy and good insulation performance.

[0057] In a preferred embodiment, in order to minimize the loss of conducted temperature, the bottom reinforcement plate 20313 is preferably designed to have a thickness of 0.2 mm, and the material may be FR4, stainless steel or other better materials.

[0058] In a preferred embodiment, the flexible thermal conductive member 20314 can be made of a thermally conductive silicone pad with a high thermal conductivity coefficient or other better materials. The thickness dimension should be larger than the gap between the module bracket 201 and the battery cell top cover 101, and it should be designed with a certain amount of compression to ensure reliable contact between the flexible thermal conductive member 20314 and the battery cell top cover 101 under the condition of external pressure.

[0059] It should be noted that the temperature collection component 2031 provided in this embodiment has double-layer reinforcement plates on the top and bottom of the thermistor for protection. Compared with some solutions in the industry that use single-layer reinforcement plates to protect thermistors, the structural strength around the thermistor 20311 is enhanced, making temperature collection more reliable. In addition, the thinner design of the bottom reinforcement plate does not reduce the performance of heat conduction while reinforcing the temperature collection component. At the same time, the bottom flexible thermal conductor 20314 has both heat conduction and buffering functions. The above design enables the temperature collection module 2031 to quickly, accurately and reliably collect the battery cell temperature under various impact and vibration conditions.

[0060] Example 2

[0061] Based on Example 1, this embodiment provides an FPC, which includes a flexible circuit board body 2032 and a temperature collection component 2031 and a nickel sheet 2033 as described in Example 1 and connected to the flexible circuit board body 2032 .

[0062] In a preferred embodiment, the temperature collection component 2031 is connected to the first cantilever beam 20321 of the flexible circuit board body 2032, and the nickel sheet 2033 is connected to the second cantilever beam 20322 of the flexible circuit board body 2032 and to the bus 202 for collecting the voltage of the battery cell module 1.

[0063] It should be noted that FPC203 mainly includes components such as flexible circuit board body 2032, temperature collection component 2031, and nickel sheet 2033. The temperature collection component 2031 is connected to the flexible circuit board body 2032 by being electrically connected to the first cantilever beam 20321; the nickel sheet 2033 is connected to the flexible circuit board body 2032 by being electrically connected to the second cantilever beam 20322, and the voltage of the battery cell module 1 is collected by welding with the bus 202. The temperature collection component 2031, the nickel sheet 2033, and the flexible circuit board body 2032 are all connected by an "S-shaped" cantilever beam. For the late cycle expansion of long-life batteries, the "S-shaped" cantilever beam can absorb certain dimensional changes, reduce the pulling of the flexible circuit board body 2032 by the expansion force in the length direction of the module, and provide structural reliability for monitoring the temperature and voltage data of the battery cells throughout the life cycle.

[0064] Example 3

[0065] Based on the second embodiment, this embodiment provides a collection module, including a module bracket 201, a bus 202 connected to the module bracket 201, and the FPC 203 as described in the second embodiment.

[0066] In a preferred embodiment, the module bracket 201 is provided with a flexible heat conductive component avoidance hole 2011 at a position corresponding to the temperature collection component 2031, which is used for the flexible heat conductive component 20314 to pass through the module bracket 201 and contact the battery cell top cover 1012; the bus 202 is electrically connected to the battery cell pole 102 and is used for series connection of multiple battery cells in the battery module.

[0067] It should be noted that the acquisition module 2 mainly includes three parts: module bracket 201, bus 202, and FPC 203. Among them, the module bracket 201 is formed by vacuum forming, and the product is thin, light, and highly flexible, with high flatness and strong scalability in size, and can be adapted to a variety of large-capacity module application scenarios. Under the premise of integrating the acquisition modules of three single-row long modules into one, this embodiment can ensure the performance requirements of high integration, low cost, and low manufacturing difficulty of the product; in addition, the module bracket 201 is provided with a flexible heat-conducting member avoidance hole 2011 at the position corresponding to the temperature collection component 2031, so that the flexible heat-conducting member 20314 can directly contact the battery cell top cover 1012 through the module bracket 201; the bus 202 and FPC 203 are fixed to the module bracket 201 by hot riveting and pressing, completing the assembly of the acquisition module 2. This solution is simple and reliable to group, and no additional fixed connection parts are required. In addition, the collection module 2 is integrated with the raw materials, which reduces the process and human resources for assembling the bus and FPC, improves production efficiency and reduces manufacturing costs.

[0068] Example 4

[0069] Based on Example 3, this embodiment adopts a battery module, including a battery cell module 1, a collection module 2 as described in Example 3, and an upper cover assembly 3;

[0070] The battery cell module 1 is connected to the upper collection module 2 , and the collection module 2 is connected to the upper cover assembly 3 .

[0071] In a preferred embodiment, the upper cover assembly 3 includes a module upper cover 301 and a foam 302;

[0072] The module upper cover 301 is provided with a downward protrusion 3011 at the position corresponding to the temperature collection component 2031, and the lower surface of the protrusion 3011 is in contact with the upper surface of the top reinforcement plate 20312 in the temperature collection component 2031. The upper surface of the protrusion 3011 is provided with foam 302 and the upper surface of the foam 302 is in contact with the battery box upper cover.

[0073] It should be noted that the base cell module of the battery module of this embodiment is composed of three rows of cells arranged one by one, the collection module 2 above the cell module 1 is welded and fixed to the cell pole 102 through the bus 202, and the upper cover assembly 3 is connected to the collection module 2 through the snap button 3012 to form the battery module.

[0074] In a preferred embodiment, the acquisition module 2 is positioned in the horizontal direction by cooperating with the tooling through the outer edge of the module bracket 201, and the vertical direction is limited by the lower surface of the busbar 202 and the upper surface of the battery cell pole 102. Furthermore, the busbar 202 is welded and fixed to the battery cell pole 102 to realize the installation of the acquisition module 2 on the battery module substrate;

[0075] In a preferred embodiment, the module upper cover 301 is formed by vacuum forming, and the vacuum forming snaps 3012 are fixed to the corresponding holes of the module bracket 201 through interference fit, thereby completing the connection between the upper cover assembly 3 and the collection module 2 to form the battery module of this embodiment.

[0076] It should be noted that the upper surface of the foam 302 is in contact with the upper cover of the battery box, and is designed to have a certain amount of compression, which plays a role in supporting and buffering the upper cover 301 of the module, and will provide pressure for the temperature collection component 2031 to ensure the reliability of the fit between the thermistor 20311, the flexible thermal conductor 20314 and the battery cell top cover 101; in addition, the design height of the thermistor 20311 is lower than the top reinforcement plate 20312, and the protrusion 3011 presses the top reinforcement plate 20312 in the vertical direction, and will not directly contact The thermistor 20311 is connected to the thermistor 20311, thereby avoiding the risk of the module cover 301 crushing the thermistor 20311 and causing the temperature collection component 2031 to fail; this solution utilizes the compression force provided by the battery case cover, the buffer foam between the battery case cover and the battery module, and realizes the compression of the temperature collection component by designing the foam and its position and the downward protruding structure of the module cover. Compared with some solutions in the industry that add a compression structure specifically for the temperature collection component in the module, this reduces the types and quantities of parts and components, and saves more cost and space.

[0077] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A temperature collection component, characterized in that: It includes a thermistor (20311) and a flexible thermal conductor (20314); The thermistor (20311) is fixedly connected to the flexible circuit board body (2032); The flexible heat-conducting member (20314) is connected to the top of the battery cell top cover (101) and is arranged at a position corresponding to the thermistor (20311); the thermistor (20311) collects the temperature of the battery cell module (1) through the flexible heat-conducting member (20314); The thickness of the flexible heat-conducting member (20314) is greater than the gap between the module support (201) and the battery cell top cover (101).

2. A temperature collection component according to claim 1, characterized in that: It also includes a top reinforcement plate (20312) and a bottom reinforcement plate (20313); The top reinforcing plate (20312) is fixedly connected to the module bracket (201), and an avoidance hole (203123) is provided at the fixed connection, and the thermistor (20311) is wrapped in a return shape through the avoidance hole (203123), and the height of the top reinforcing plate (20312) is higher than that of the thermistor (20311); The bottom reinforcement plate (20313) is connected between the flexible circuit board body (2032) and the flexible heat conductive member (20314) and is located corresponding to the thermistor (20311).

3. A temperature collection component according to claim 1, characterized in that: The flexible heat-conducting component (20314) adopts a heat-conducting silicone pad.

4. An FPC, characterized in that: It comprises a flexible circuit board main body (2032) and a temperature collection component (2031) and a nickel sheet (2033) as claimed in claim 1 which are connected to the flexible circuit board main body (2032).

5. The FPC according to claim 4, characterized in that: The temperature collection component (2031) is connected to the first cantilever beam (20321) of the flexible circuit board body (2032), and the nickel sheet (2033) is connected to the second cantilever beam (20322) of the flexible circuit board body (2032) and to the bus bar (202), for collecting the voltage of the battery cell module (1).

6. The FPC according to claim 5, characterized in that: The first cantilever beam (20321) and the second cantilever beam (20322) are both S-shaped.

7. A collection module, characterized in that: It comprises a module support (201), a bus bar (202) connected to the module support (201), and the FPC (203) as claimed in claim 4.

8. A collection module according to claim 7, characterized in that: The module support (201) is provided with a flexible heat-conducting component avoidance hole (2011) at a position corresponding to the temperature collection component (2031), which is used for the flexible heat-conducting component (20314) to pass through the module support (201) and contact the battery cell top cover (101); the busbar (202) is electrically connected to the battery cell pole (102) and is used for connecting multiple battery cells in series in the battery module.

9. A battery module, characterized in that: It comprises a battery cell module (1), a collection module (2) as claimed in claim 7, and an upper cover assembly (3); The battery cell module (1) is connected to an upper collection module (2), and the collection module (2) is connected to an upper cover assembly (3).

10. The battery module according to claim 9, characterized in that: The upper cover assembly (3) comprises a module upper cover (301) and foam (302); The module upper cover (301) is provided with a downward protrusion (3011) at a position corresponding to the temperature collection component (2031), the lower surface of the protrusion (3011) is in contact with the upper surface of the top reinforcement plate (20312) in the temperature collection component (2031), and the upper surface of the protrusion (3011) is provided with foam (302), and the upper surface of the foam (302) is in contact with the battery box upper cover.

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