A battery separator, a battery case, and a battery thermal management system

Abstract

The application discloses a battery separator, a battery box and a battery thermal management system. A temperature sensor of the battery separator is arranged in the inside of a first heat-conducting insulating plate. The first heat-conducting insulating plate comprises a plurality of first boron nitride epoxy resin sheets and is used for being in contact with a battery and conducting heat of the battery to realize uniform heating or heat dissipation of the battery. The inside of the first boron nitride epoxy resin sheet is provided with a glass fiber cloth. The first boron nitride epoxy resin sheet of the separator can build an effective three-dimensional heat-conducting link and improve the strength of the separator by using boron nitride and the glass fiber cloth, can quickly and uniformly conduct the heat of the battery to a shell or other structures and avoid heat concentration. The temperature sensor is arranged in the inside of the first heat-conducting insulating plate, so that the temperature sensor is prevented from falling off or being damaged. The shell and the cover of the battery box can uniformly heat and dissipate heat of a battery cell and an electrode tab. The battery thermal management system can effectively obtain the temperature of each battery cell, quickly make a control decision and effectively reduce the fire occurrence probability.

Description

Technical Field

[0001] This utility model relates to the field of battery thermal management technology, and in particular to a battery separator, a battery box, and a battery thermal management system. Background Technology

[0002] With the widespread adoption of new energy vehicles, spontaneous combustion incidents involving car batteries are occurring frequently. Battery safety is a pressing issue that urgently needs to be addressed. Generally, new energy vehicles use multiple battery packs for power supply to meet range requirements, and these packs are typically separated by insulating materials. Due to the large number of battery packs and the complex chemical structure of the batteries, uneven heating can occur, leading to localized overheating and poor heat dissipation, potentially causing fires. Furthermore, battery management systems typically control battery operation based on temperature sensors. Currently, many temperature sensors are attached to the battery pack, making them prone to aging, displacement, or damage. Therefore, current batteries suffer from concentrated heat generation, poor heat dissipation, and inefficient temperature sensor placement. Summary of the Invention

[0003] To improve battery heat dissipation and reduce the risk of thermal failure, this application proposes a battery separator, a battery box, and a battery thermal management system.

[0004] To achieve the above objectives, this utility model provides a battery separator, comprising: a temperature sensor and a first thermally conductive insulating plate; the temperature sensor is disposed inside the first thermally conductive insulating plate and is used to detect the temperature of the battery; the first thermally conductive insulating plate is used to contact the battery and conduct the battery heat to achieve uniform heating or heat dissipation of the battery; the first thermally conductive insulating plate comprises: a plurality of first boron nitride epoxy resin sheets; glass fiber cloth is disposed inside the first boron nitride epoxy resin sheets.

[0005] Optionally, the temperature sensor is an NTC sensor.

[0006] Secondly, this utility model provides a battery box, including: the aforementioned battery separator and a shell; the shell is used to place multiple battery cells; the battery separator is disposed between each battery cell and is used to detect the temperature of each battery cell and conduct heat to each battery cell; the shell is composed of multiple first heat-conducting plates for heat equalization and heat dissipation of the battery cells and the battery separator.

[0007] Optionally, a cover is provided; the cover is mounted on the housing; the cover consists of multiple second heat-conducting plates for heat equalization and dissipation of the electrode tabs.

[0008] Optionally, the first heat-conducting plate and the second heat-conducting plate are one or more of the following: aluminum plate, iron plate, and stainless steel plate.

[0009] Optionally, a second thermally conductive insulating sheet is provided between the housing and the cover and the battery cell, the second thermally conductive insulating sheet being used to conduct the heat of the battery cell to the housing and the cover.

[0010] Optionally, the second thermally conductive insulating sheet includes: a plurality of second boron nitride epoxy resin sheets; the second boron nitride epoxy resin sheets are internally provided with glass fiber cloth.

[0011] Optionally, the inner wall shape of the cover matches the shape of the electrode tab; the shape of the second thermally conductive insulating plate between the cover and the battery cell matches the shape of the electrode tab.

[0012] Optionally, the cover, the second thermally conductive insulating plate, and the electrode tabs are arranged in sequential contact.

[0013] Furthermore, this utility model provides a battery thermal management system, including: the aforementioned battery box and a battery management circuit; the battery management circuit is connected to the temperature sensor of the battery separator, and is used to control the working state of each cell according to the temperature detected by the temperature sensor.

[0014] This utility model has the following beneficial effects: 1. The battery separator of this utility model is provided with a first thermally conductive insulating plate, which includes multiple first boron nitride epoxy resin sheets and glass fiber cloth disposed inside the first boron nitride epoxy resin sheets. Boron nitride has high thermal conductivity and is dispersed in the resin matrix to form an effective three-dimensional thermal conduction link. At the same time, the glass fiber is modified and coated with boron nitride, which not only improves the material strength but also constructs a thermally conductive lateral pathway. Therefore, the first thermally conductive insulating plate can quickly and evenly conduct the heat of the battery cell to the shell or other structures, avoiding heat concentration and greatly reducing the probability of battery thermal failure. At the same time, the temperature sensor is placed inside the first thermally conductive insulating plate, which can effectively measure the temperature of the battery and prevent the temperature sensor from falling off or being damaged, thus improving the stability of temperature measurement.

[0015] 2. The battery box of this utility model is composed of multiple first heat-conducting plates and multiple second heat-conducting plates, respectively. Therefore, the shell and cover can effectively heat and dissipate the heat of all cells and all electrode tabs, reducing the possibility of fire caused by concentrated battery heat.

[0016] 3. The shape of the inner wall of the cover of the battery box of this utility model matches the shape of the electrode tab, and the shape of the second thermally conductive insulating plate between the cover and the battery cell also matches the shape of the electrode tab. The cover, the second thermally conductive insulating plate and the electrode tab are arranged in sequence to contact each other, so that the cover, the second thermally conductive insulating plate and the electrode tab can fit together and directly conduct the heat of the electrode tab to the cover, so as to achieve better heat conduction and heat dissipation effect on the electrode tab.

[0017] 4. The battery thermal management system of this utility model includes a battery management circuit connection, which is connected to a temperature sensor. The battery management circuit can effectively obtain the temperature of each cell, make control decisions quickly, and effectively reduce the probability of fire. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein: Figure 1 This is a schematic diagram of the battery box structure provided in an embodiment of the present utility model; Figure 2 This is another structural schematic diagram of the battery box provided in this embodiment of the utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the battery box AA provided in an embodiment of this utility model.

[0019] Explanation of icon numbers: 1. Battery separator; 11. Temperature sensor; 12. First thermally conductive insulating plate; 2. Housing; 21. First thermally conductive plate; 3. Battery cell; 4. Cover; 41. Second thermally conductive plate; 5. Electrode tabs. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Reference Figures 1 to 3 A battery separator 1 includes: a temperature sensor 11 and a first thermally conductive insulating plate 12; the temperature sensor 11 is disposed inside the first thermally conductive insulating plate 12 and is used to detect the temperature of the battery; the first thermally conductive insulating plate 12 is used to contact the battery and conduct the battery heat to achieve uniform heating or heat dissipation of the battery.

[0022] The first thermally conductive insulating plate 12 includes: a plurality of first boron nitride epoxy resin sheets; glass fibers are disposed inside the first boron nitride epoxy resin sheets. Further, the first boron nitride epoxy resin sheets are formed by hot pressing epoxy resin, boron nitride, and glass fibers; the epoxy resin serves as the matrix; the boron nitride serves as a thermally conductive filler, possessing excellent thermal conductivity, and is dispersed in the resin matrix to construct an effective three-dimensional thermal conductivity pathway; the glass fibers are modified and coated with boron nitride, which both improves the material strength and constructs lateral thermal conductivity pathways. The first thermally conductive insulating plate 12 is formed by pressing together a plurality of first boron nitride epoxy resin sheets.

[0023] Furthermore, the glass fiber is glass fiber cloth; that is, glass fiber cloth is disposed inside the first boron nitride epoxy resin sheet.

[0024] Furthermore, the temperature sensor 11 is an NTC sensor.

[0025] Reference Figures 1 to 3 A battery box includes: the aforementioned battery separator 1 and a housing 2; the housing 2 is used to place multiple battery cells 3; the battery separator 1 is disposed between each battery cell 3 and is used to detect the temperature of each battery cell 3 and conduct heat to each battery cell 3; the housing 2 is composed of multiple first heat-conducting plates 21, which are used to evenly heat and dissipate heat between the battery cells 3 and the battery separator 1.

[0026] The battery box also includes: a cover 4; the cover 4 is mounted on the housing 2; the cover 4 is composed of multiple second heat-conducting plates 41, which are used to evenly heat and dissipate heat from the electrode tabs 5.

[0027] Furthermore, the first heat-conducting plate 21 and the second heat-conducting plate 41 are one or more of the following: aluminum plate, iron plate, and stainless steel plate.

[0028] Furthermore, a second thermally conductive insulating plate (not shown) is respectively provided between the housing 2 and the cover 4 and the battery cell 3. The second thermally conductive insulating plate is used to conduct heat from the battery cell 3 to the housing 2 and the cover 4. The second thermally conductive insulating plate includes a plurality of second boron nitride epoxy resin sheets. The structure and material of the second boron nitride epoxy resin sheets are the same as those of the first boron nitride epoxy resin sheets. Furthermore, the interior of the second boron nitride epoxy resin sheets is also provided with glass fiber cloth.

[0029] In one embodiment, the inner wall shape of the cover 4 matches the shape of the electrode tab 5 (not shown), and correspondingly, the shape of the second thermally conductive insulating plate between the cover 4 and the battery cell 3 also matches the shape of the electrode tab 5; the cover 4, the second thermally conductive insulating plate and the electrode tab 5 are sequentially arranged in contact, so that the cover 4, the second thermally conductive insulating plate and the electrode tab 5 can fit together and directly conduct the heat of the electrode tab 5 to the cover, so as to achieve better heat conduction and heat dissipation effect on the electrode tab.

[0030] A battery thermal management system includes: the aforementioned battery box and a battery management circuit; the battery management circuit is connected to the temperature sensor 11 of the battery separator, and is used to control the working state of each battery cell 3 according to the temperature detected by the temperature sensor.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A battery separator, characterized in that, include: Temperature sensor (11) and first thermally conductive insulating plate (12); the temperature sensor (11) is disposed inside the first thermally conductive insulating plate (12) for detecting the temperature of the battery; the first thermally conductive insulating plate (12) is used to contact the battery and conduct the battery heat to achieve uniform heating or heat dissipation of the battery; the first thermally conductive insulating plate (12) includes: a plurality of first boron nitride epoxy resin sheets; The first boron nitride epoxy resin sheet has a glass fiber cloth inside.

2. The battery separator according to claim 1, characterized in that, The temperature sensor (11) is an NTC sensor.

3. A battery box, characterized in that, include: The battery separator (1) and housing (2) as described in any one of claims 1-2; the housing (2) is used to place multiple battery cells (3); the battery separator (1) is disposed between each battery cell (3) and is used to detect the temperature of each battery cell and conduct heat to each battery cell; the housing (2) is composed of multiple first heat-conducting plates (21) for heat equalization and heat dissipation of the battery cells (3) and the battery separator (1).

4. The battery box according to claim 3, characterized in that, Also includes: Cover (4); the cover (4) is mounted on the housing (2); the cover (4) is composed of multiple second heat-conducting plates (41) for uniform heating and heat dissipation of the electrode tabs (5).

5. The battery box according to claim 4, characterized in that, The first heat-conducting plate (21) and the second heat-conducting plate (41) are one or more of the following: aluminum plate, iron plate, and stainless steel plate.

6. The battery box according to claim 5, characterized in that, A second thermally conductive insulating sheet is provided between the housing (2) and the cover (4) and the battery cell (3), respectively. The second thermally conductive insulating sheet is used to conduct the heat of the battery cell (3) to the housing (2) and the cover (4).

7. The battery box according to claim 6, characterized in that, The second thermally conductive insulating sheet includes: a plurality of second boron nitride epoxy resin sheets; the second boron nitride epoxy resin sheets are internally provided with glass fiber cloth.

8. The battery box according to claim 6, characterized in that, The inner wall shape of the cover (4) matches the shape of the electrode tab (5); the shape of the second thermally conductive insulating plate between the cover (4) and the battery cell (3) matches the shape of the electrode tab (5).

9. The battery box according to claim 8, characterized in that, The cover (4), the second thermally conductive insulating plate, and the electrode tabs (5) are sequentially arranged in contact.

10. A battery thermal management system, characterized in that, include: The battery box and battery management circuit as described in any one of claims 3-9; The battery management circuit is connected to the temperature sensor (11) of the battery separator and is used to control the working state of each cell (3) according to the temperature detected by the temperature sensor (11).

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