Protective plate of battery module and battery module

Abstract

The utility model discloses a protection board of a battery module and the battery module, the protection board of the battery module comprises a PCB (100), a first electric connection part (200) and a PTC (300), the PTC (300) is arranged between the first electric connection part (200) and the PCB (100), at least part of the PTC (300) is overlapped with the first electric connection part (200), and the first electric connection part (200) is electrically connected with the PCB (100) through the PTC (300). According to the technical scheme, the problem that the overall size of the protection plate is large due to the fact that the size of the surface area of a device arranged on a PCB in the background technology is large can be solved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a protection plate of a battery module and a battery module. Background Art

[0002] The protection board of the battery module usually refers to the protection board of the lithium battery module. This is mainly because the material of the lithium battery itself determines that it cannot be overcharged, over-discharged, over-current and short-circuited. Therefore, a special protection board is needed to protect the battery module.

[0003] The protection board of the battery module mainly includes a PCB (printed circuit board), a control IC (Integrated Circuit), a MOS (MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor) switch, a precision resistor and a PTC (Positive Temperature Coefficient) thermistor, an ID memory, etc. In the related art, devices such as PTC, control IC and control MOS switch are evenly distributed on the surface of the PCB board, which makes the surface area of ​​the devices on the PCB board larger, which in turn leads to a larger overall size of the protection board. Utility Model Content

[0004] The purpose of the embodiments of the present application is to disclose a protection board for a battery module, which can solve the problem that the surface area of ​​the components arranged on the PCB board of the background technology is large, which leads to a large overall size of the protection board.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a protection plate for a battery module, the disclosed protection plate comprising a PCB board, a first electrical connection portion and a PTC, the PTC being arranged between the first electrical connection portion and the PCB board, at least a portion of the PTC being overlapped with the first electrical connection portion, and the first electrical connection portion being electrically connected to the PCB board through the PTC.

[0007] In a second aspect, an embodiment of the present application provides a battery module, wherein the disclosed battery module comprises a battery module body and the protection plate described above, wherein the protection plate is electrically connected to the battery module body.

[0008] The technical solution adopted in this application can achieve the following beneficial effects:

[0009] The protection plate of the battery module disclosed in the embodiment of the present application is a technical improvement on the structure of the protection plate in the related art, by arranging the PTC between the first electrical connection part and the PCB board, and arranging at least part of the PTC to overlap with the first electrical connection part, so that on the surface of the PCB board layout device, the actual layout area occupied by the first electrical connection part and the PTC is smaller than the layout area occupied by the two overlapping with the PCB board respectively, thereby being able to reduce the surface area occupied by the layout device on the PCB board, which is conducive to reducing the size of the surface area of ​​the layout device on the PCB board, and further reducing the overall size of the protection plate. The technical solution adopted in the present application can solve the problem that the surface area of ​​the layout device on the PCB board in the background technology is large, which leads to a large overall size of the protection plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the protection plate of the battery module disclosed in the embodiment of the present application.

[0011] Description of reference numerals:

[0012] 100-PCB board, 110-mounting slot, 120-first board surface, 130-second board surface;

[0013] 200-first electrical connection portion;

[0014] 300-PTC;

[0015] 400-MOS switch;

[0016] 500-control IC;

[0017] 600-Connection line. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0020] The protection plate of the battery module disclosed in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, an embodiment of the present application discloses a protection plate for a battery module, that is, a protection plate for a lithium battery module. Optionally, the protection plate in the present application can be applied to lithium-ion battery modules such as lithium iron phosphate battery modules, lithium nickel oxide battery modules, lithium manganese oxide battery modules, and lithium cobalt oxide battery modules to provide overcharge protection, discharge protection, overcurrent protection, and short circuit protection.

[0022] The battery module disclosed in the present application includes a PCB board 100, a first electrical connection part 200 and a PTC300, wherein the PTC300 is arranged between the first electrical connection part 200 and the PCB board 100, at least a part of the PTC300 overlaps with the first electrical connection part 200, and the first electrical connection part 200 is electrically connected to the PCB board 100 through the PTC300, so that on the surface of the PCB board 100 where the components are arranged, the first electrical connection part 200 and the PTC300 can share the arrangement area of ​​the overlapping area of ​​the two, that is, compared with the related art, in which each component is evenly distributed on the surface of the PCB board 100, the present application can reduce the area occupied by the first electrical connection part 200 and the PTC300 arranged on the PCB board 100. At this time, other components arranged on the PCB board 100 can be arranged in a centralized manner, thereby reducing the size of the PCB board 100, and further reducing the overall size of the entire protection plate.

[0023] The protection board of the battery module disclosed in the embodiment of the present application is a technical improvement on the structure of the protection board in the related art, by arranging the PTC300 between the first electrical connection part 200 and the PCB board 100, and arranging at least part of the PTC300 to overlap with the first electrical connection part 200, so that on the surface of the PCB board 100 where the device is arranged, the actual arrangement area occupied by the first electrical connection part 200 and the PTC300 is smaller than the arrangement area occupied by the two overlapping with the PCB board 100 respectively, so that the surface area occupied by the device arranged on the PCB board 100 can be reduced, which is conducive to reducing the size of the surface area of ​​the device arranged on the PCB board 100, and further reducing the overall size of the protection board. The technical solution adopted in the present application can solve the problem that the surface area of ​​the device arranged on the PCB board in the background technology is large, which leads to the problem that the overall size of the protection board is large.

[0024] Reducing the surface area of ​​the device on the PCB board 100 can reduce the size of the PCB board 100 and the overall size of the protection board, which is beneficial to improving the mass energy density of the battery module. Optionally, in the protection board disclosed in the present application, in the direction perpendicular to the board surface of the PCB board 100, the orthographic projection of the first electrical connection part 200 can cover the orthographic projection of the PTC 300. In this case, on the surface of the PCB board 100 where the device is arranged, the PTC 300 and the first electrical connection part 200 can completely share the arrangement area, which can further reduce the occupation of the surface area of ​​the PCB board 100 by the device.

[0025] In an optional embodiment, the PTC 300 can be embedded in the PCB board 100 to reduce the space occupied by the entire protection board. In a specific embodiment, the PCB board 100 can be provided with a mounting groove 110, and the PTC 300 is arranged in the mounting groove 110. In this case, the embedded setting mode of the PTC 300 in the PCB board 100 can reduce the surface area occupied by the PTC 300 on the PCB board 100, and is also conducive to the thinning design of the entire protection board. At the same time, the PTC 300 is arranged in the mounting groove 110, so that the groove wall of the mounting groove 110 forms protection for the surroundings of the PTC 300, thereby alleviating the phenomenon of aging caused by the invasion of external water vapor into the interior of the PTC 300.

[0026] The dimension in the direction perpendicular to the surface of the PCB 100 where the components are arranged is the thickness of each component, which is also the height of the mounting groove 110. In a further optional embodiment, in the direction perpendicular to the board surface of the PCB 100, the first dimension of the PTC 300 and the second dimension of the mounting groove 110 may be equal. In other words, the height of the mounting groove 110 is equal to the thickness of the PTC 300, so that after the PTC 300 is installed in the mounting groove 110, the surface of the PTC 300 facing the first electrical connection portion 200 can be flush with the surface of the PCB 100 facing the first electrical connection portion 200, so that the PTC 300 can be more appropriately installed in the mounting groove 110, while avoiding excessive increase in the height of the mounting groove 110, which may cause adverse effects on the structural strength of the area of ​​the PCB 100 where the mounting groove 110 is opened.

[0027] In order to better protect the installed PTC300, optionally, the first electrical connection part 200 can cover the notch of the installation groove 110 to form an installation space, and the PTC300 is arranged in the installation space. In this case, the groove walls of the installation groove 110 and the side of the first electrical connection part 300 facing the PTC300 together form an installation space where the PTC300 can be installed. Specifically, the installation space can be a sealed space, so that the installation space can play a protective role on all surfaces of the PTC300, which is conducive to further avoiding the invasion of external water vapor into the PTC300 and causing the aging of the PTC300.

[0028] In the protection plate disclosed in the embodiment of the present application, the protection plate may further include a connector, which is disposed at the bottom of the mounting groove 110, and the PTC 300 is disposed in the mounting groove 110 through the connector, so that the PTC 300 can be relatively stably installed in the mounting groove 110. Optionally, the connector may be an adhesive film.

[0029] In an optional embodiment, the protection board of the battery module may further include a connection line 600 and an electrically connected MOS switch 400 and a control IC 500, the PCB board 100 includes a first board surface 120 and a second board surface 130 that are arranged opposite to each other, the MOS switch 400 and the control IC 500 are arranged on the second board surface 130, the first electrical connection portion 200 is arranged on the first board surface 120, and the MOS switch 400 is electrically connected to the PTC 300 through the connection line 600. In this case, arranging different devices on two opposite board surfaces of the PCB board 100 is conducive to avoiding all devices being arranged on one side of the PCB board 100, resulting in a larger size of the PCB board 100 being occupied. In addition, arranging different devices on two opposite board surfaces of the PCB board 100 can reduce the length of the connection line 600 connecting the MOS switch 400 and the PTC 300. In the present application, the length of the connection line 600 connecting the MOS switch 400 and the PTC 300 is less than the thickness of the PCB board 100, and the reduction in the length of the connection line 600 can reduce the internal resistance of the connection line 600, thereby reducing the temperature rise of the battery module during charging.

[0030] Under normal circumstances, the control IC 500 can control the MOS switch 400 to be turned on, so that the battery module body is connected to the external circuit. When the voltage or loop current of the battery module body exceeds the specified value, the control IC 500 can immediately (for example, tens of milliseconds) control the MOS switch 400 to be turned off to protect the safety of the battery module body.

[0031] In an optional embodiment, the connection line 600 may be a via-filling line. The via-filling process has the advantages of being able to prevent impurities from entering, being conducive to reducing pollution and improving the mechanical strength of the via. It should be noted that the via-filling line is a via-plated copper line, which may be specifically opened at the position where the connection line 600 is to be arranged on the PCB board 100, and the hole wall may be electroplated to make it conductive, and then a conductive or non-conductive material may be filled in the hole.

[0032] Based on the protection plate of the battery module disclosed in the embodiment of the present application, the embodiment of the present application also discloses a battery module, the disclosed battery module includes a battery module body and any one of the protection plates described above, and the protection plate is electrically connected to the battery module body.

[0033] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0034] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A protective plate for a battery module, characterized in that: The invention comprises a PCB board (100), a first electrical connection part (200) and a PTC (300), wherein the PTC (300) is arranged between the first electrical connection part (200) and the PCB board (100), at least a part of the PTC (300) overlaps with the first electrical connection part (200), and the first electrical connection part (200) is electrically connected to the PCB board (100) via the PTC (300).

2. The protection plate of the battery module according to claim 1, characterized in that: In a direction perpendicular to the surface of the PCB board (100), the orthographic projection of the first electrical connection portion (200) covers the orthographic projection of the PTC (300).

3. The protection plate of the battery module according to claim 1, characterized in that: The PCB board (100) is provided with a mounting groove (110), and the PTC (300) is arranged in the mounting groove (110).

4. The protection plate of the battery module according to claim 3, characterized in that: In a direction perpendicular to the surface of the PCB board (100), a first dimension of the PTC (300) is equal to a second dimension of the mounting groove (110).

5. The protection plate of the battery module according to claim 4, characterized in that: The first electrical connection portion (200) covers the notch of the installation slot (110) to form an installation space, and the PTC (300) is arranged in the installation space.

6. The protection plate of the battery module according to claim 3, characterized in that: The protection plate further comprises a connecting piece, the connecting piece being arranged at the bottom of the installation groove (110), and the PTC (300) being arranged in the installation groove (110) via the connecting piece.

7. The protection plate of the battery module according to claim 6, characterized in that: The connecting member is an adhesive film.

8. The protection plate of the battery module according to claim 3, characterized in that: The protection board also includes a connection circuit (600) and an electrically connected MOS switch (400) and a control IC (500); the PCB board (100) includes a first board surface (120) and a second board surface (130) that are arranged opposite to each other; the MOS switch (400) and the control IC (500) are arranged on the second board surface (130); the first electrical connection portion (200) is arranged on the first board surface (120); and the MOS switch (400) is electrically connected to the PTC (300) via the connection circuit (600).

9. The protection plate of the battery module according to claim 8, characterized in that: The connecting circuit (600) is a via-filling circuit.

10. A battery module, characterized in that: It comprises a battery module body and the protection plate according to any one of claims 1 to 9, wherein the protection plate is electrically connected to the battery module body.

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