CN214542460U

CN214542460U - Battery protection board, battery module and consumer

Info

Publication number: CN214542460U
Application number: CN202120538496.3U
Authority: CN
Inventors: 宁勤恒; 刘灼鹏; 沈江腾; 欧阳光
Original assignee: Dongguan Nvt Technology Co Ltd
Current assignee: Dongguan Nvt Technology Co Ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2021-10-29
Anticipated expiration: 2031-03-15

Abstract

The application discloses battery protection shield, battery module and consumer. The battery protection board comprises a first circuit board and a second circuit board, the first circuit board comprises a main body part and a connecting part, the thickness of the main body part is D in the thickness direction of the first circuit board, and the height difference H between the connecting part and the first surface of the main body part is more than or equal to 0.15 and less than or equal to 0.5; the second circuit board is electrically connected with the first surface of the connecting part. The connecting portion of this application design first circuit board is less than the main part, can enough promote the stability of electricity connection between connecting portion and the second circuit board, can also reduce the thickness of the connection region of two circuit boards to be favorable to reducing the thickness of battery protection shield and battery, consumer.

Description

Battery protection board, battery module and consumer

Technical Field

The application relates to the technical field of batteries, in particular to a battery protection board, a battery module and electric equipment.

Background

The battery is a large space-occupying part, and has a great influence on the thickness of the electric equipment. In order to reduce the overall thickness of the consumer as much as possible, manufacturers generally strive to maximize the use of the head space of the battery. The head of the battery mainly comprises a battery protection plate and some elements for insulation protection, wherein the space occupied by the battery protection plate is large. Therefore, improving the structural design of the battery protection plate is one of the effective measures for reducing the thickness of the battery.

Disclosure of Invention

In view of this, the present application provides a battery protection board, a battery module and an electric device, so as to solve the problem of large thickness of the battery.

A first aspect of the present application provides a battery protection board including a first circuit board and a second circuit board. The first circuit board comprises a main body part and a connecting part, wherein the thickness of the main body part is D, and the height difference H between the first surface of the connecting part and the first surface of the main body part is more than or equal to 0.15 and less than or equal to 0.5. The second circuit board is in contact with and electrically connected with the first surface of the connecting part, and the first surface of the connecting part and the first surface of the main body part are positioned on the same side of the first circuit board.

Optionally, the first surface of the connecting portion is provided with a pad, and the second circuit board is soldered to the first surface of the connecting portion through the pad.

Optionally, in the thickness direction of the first circuit board, an orthographic projection of the end portion of the second circuit board falls into the first surface of the connecting portion, and the battery protection board further includes a packaging body covering a connecting area of the connecting portion and the second circuit board.

Optionally, a height difference H between the first surface of the connecting portion and the first surface of the main body portion is greater than a thickness of the second circuit board, and the package body is lower than or flush with the first surface of the main body portion.

Optionally, the package comprises a UV glue block, an injection molded rubber block or an injection molded plastic block.

Optionally, the first circuit board is a rigid circuit board and the second circuit board is a flexible circuit board.

The second aspect of the present application provides a battery module, including electric core and the above-mentioned battery protection shield of any one. The battery core comprises an electrode assembly and a lug, wherein the lug is electrically connected with the electrode assembly, and the conductive piece of the battery protection plate is electrically connected with the lug.

Optionally, the first circuit board further includes a conductive component disposed on one side of the main body portion, the conductive component is electrically connected to a tab of the battery cell, the first surface of the connecting portion faces the tab, and an end of the second circuit board is located between the connecting portion and the tab.

Optionally, the thickness direction of the first circuit board is parallel to or perpendicular to the thickness direction of the battery cell.

The second aspect of the present application provides an electric device, which includes the battery module described in any one of the above loads, and the battery module is used for supplying power to the load.

In the battery protection board, the battery module and the electric equipment, in a connecting area of the first circuit board and the second circuit board, a height difference H is formed between the first surface of the connecting part and the first surface of the main body part, namely, the connecting part is lower than the main body part, and a concave area is arranged in the connecting area corresponding to the first circuit board, so that the thickness of the connecting area is smaller than the sum of the thicknesses of the first circuit board and the second circuit board, the thickness of the battery protection board in the connecting area can be reduced, and the thickness of the battery and the thickness of the electric equipment with the battery can be reduced; in addition, the height difference H and the thickness of the main body part are D, H/D is more than or equal to 0.15 and less than or equal to 0.5, the connecting part can be enabled to have the thickness meeting the structural strength, and the stability of electric connection between the connecting part and the second circuit board is improved.

Drawings

Fig. 1 and 2 are schematic structural views of a battery protection plate according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a battery module according to an embodiment of the present application;

FIG. 4 is an enlarged view of the structure of selected area II shown in FIG. 3;

FIG. 5 is a schematic sectional view of the joint region I shown in FIG. 2 taken along the direction A-A;

fig. 6 and 7 are schematic structural views of a battery protection plate according to another embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments and accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and are not to be taken as the whole. Based on the embodiments in the present application, the following respective embodiments and technical features thereof may be combined with each other without conflict.

It should be understood that in the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions and simplifying the description of the respective embodiments of the present application, and do not indicate or imply that a device or an element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.

The embodiment of the application firstly provides a battery protection board, in the connection area of two circuit boards, the connection part of one circuit board is lower than the main body part, and equivalently, the circuit board is provided with a depressed area or a step in the connection area, so that the thickness of the connection area is smaller than the sum of the thicknesses of the two circuit boards, and the thickness of the battery protection board in the connection area is reduced.

The type of the battery to which the battery protection plate is applied is not limited in the embodiments of the present application, and the shape, size, function, and the like of the battery protection plate may be determined according to the application scenario. For example, in some scenarios, the Battery protection board may be a BMS (Battery management system) circuit board, which controls charging and discharging of the Battery module to ensure safety.

Referring to fig. 1 to 5, the battery protection plate 10 includes two circuit boards, namely a first circuit board 11 and a second circuit board 12.

The first circuit board 11 includes a main body portion 11a and a connecting portion 11 b. A conductive member 111 is provided at one side of the body part 11a, and the conductive member 111 is used to electrically connect the tab 21 of the battery module 20.

In the thickness direction of the first circuit board 11, i.e., in the direction indicated by the arrow x in fig. 5, the thickness of the main body portion 11a is D, the first surface 11c of the connecting portion 11b and the first surface 11D of the main body portion 11a are located on the same side of the first circuit board 11, the first surface 11c of the connecting portion 11b and the first surface 11D of the main body portion 11a have a height difference H therebetween, i.e., the thickness D1 of the connecting portion 11b is smaller than the thickness D of the main body portion 11a, i.e., D1 < D, and the first surface 11c of the connecting portion 11b is lower than the first surface 11D of the main body portion 11 a. It should be understood that the thickness D of the main body portion 11a is only the thickness of a plate body, and includes the thickness of components arranged thereon, i.e., the thickness in the present embodiment does not include the thickness of components on a circuit board.

The height difference H and the thickness of the main body portion are D, H/D is more than or equal to 0.15 and less than or equal to 0.5, so that the connecting portion 11b has the thickness meeting the structural strength, and the stability of electric connection between the connecting portion 11b and the second circuit board 12 is improved.

The second circuit board 12 is in contact with and electrically connected to the first surface 11c of the connection portion 11 b.

The connecting portion 11b is lower than the main body portion 11a, and a recessed area (or a step) is formed in the connecting area I corresponding to the first circuit board 11, so that the thickness of the connecting area I is smaller than the sum of the thicknesses of the first circuit board 11 and the second circuit board 12, and thus the thickness of the battery protection plate 10 in the connecting area I can be reduced, which is beneficial to reducing the thicknesses of the battery module 20 and the electric device.

In one scenario, as shown in fig. 3, the first Circuit Board 11 may be a rigid Circuit Board, such as a Printed Circuit Board (PCB), and the second Circuit Board 12 may be a Flexible Printed Circuit (FPC). The second circuit board 12 may be provided with an external terminal 121, and electrically connected to an external device or an electric device through the external terminal 121.

When the battery protection plate 10 is mounted on the head of the battery module 20, as shown in fig. 3 and 4, the first surface 11c of the connection portion 11b may face the tab 21 of the battery cell 22, and the end portion of the second circuit board 12 electrically connected to the first circuit board 11 is located between the connection portion 11b and the tab 21. Since the tab 21 occupies a certain space in the thickness direction of the head of the battery module 20 after being connected to the conductive member 111, even if the connection region I has a protrusion of a small thickness, the protrusion can be received in the head space without enlarging the head of the battery module 20.

In the embodiment shown in fig. 3, the thickness direction x of the first circuit board 11 is parallel to the thickness direction of the battery cell 22. In other embodiments, the thickness direction x of the first circuit board 11 may also be perpendicular to the thickness direction of the battery cell 22, and further optionally, an end portion of the second circuit board 12, which is electrically connected to the first circuit board 11, is located between the connection portion 11b and the battery cell 22.

In one implementation, the first surface 11c of the connection portion 11b may be provided with a pad 112, and the second circuit board 12 is soldered to the first surface 11c of the connection portion 11b through the pad 112. The number, size and shape of the pads 112, the embodiment of the present application may be determined according to the actual situation, and the six pads 112 shown in fig. 2 are only for exemplary illustration.

In another implementation, the second circuit board 12 and the first surface 11c of the connecting portion 11b are reserved with or exposed to a conductive element, and the two are directly soldered.

It should be understood that the present application does not limit the manner of electrical connection between the second circuit board 12 and the first surface 11c of the connection portion 11b, for example, in a scenario where the first surface 11c of the connection portion 11b is provided with the pad 112, after the second circuit board 12 is placed on the connection portion 11b and is in contact with the first surface 11c of the connection portion 11b, the two are bonded by an encapsulation body such as glue, so as to achieve electrical connection between the first circuit board 11 and the second circuit board 12.

The battery protection plate 10 may be further provided with an encapsulation 13, the encapsulation 13 partially covering the connection region I, in the connection region I along the thickness direction x of the first circuit board 11, with an orthographic projection of the end portion of the second circuit board 12 falling within the first surface 11c of the connection portion 11 b.

In other implementations, the package 13 may cover the entire connection region I.

The package body 13 is not only favorable for increasing the structural strength of the connection region I, so that the stability of electrical connection is good, but also can prevent water, oxygen, dust and the like from entering between the first surface 11c of the connection portion 11b and the second circuit board 12, which is favorable for further improving the stability of electrical connection.

In an implementation, the height difference H may be greater than the thickness of the second circuit board 12, so that the second circuit board 12 is lower than the first surface 11d of the main body portion 11a, which can facilitate further thinning of the thickness of the connection region I. With this implementation, the package body 13 may be lower than or flush with the first surface 11d of the main body portion 11a, so that the thickness of the battery protection board 10 at the connection region I is still smaller than the sum of the thicknesses of the first circuit board 11 and the second circuit board 12.

The material of the package 13 is not limited in the embodiment of the application, for example, the package 13 may be a UV glue block, an injection rubber block, or an injection plastic block. The preparation method of the package 13 may be selected according to material suitability.

Another embodiment of the present application provides a battery module 20, as shown in fig. 3, the battery module 20 includes a battery core 22 and the battery protection plate 10 of any of the above embodiments. The battery cell 20 includes an electrode assembly (not shown) and a tab 21, the tab 21 is electrically connected to the electrode assembly, and the conductive member 111 of the battery protection plate 10 is electrically connected to the tab 21.

It should be understood that the battery module 20 shown in fig. 3 includes only one battery cell 22, which is shown only for exemplary illustration, in other scenarios, the battery module 20 may include a plurality of battery cells 22, each battery cell 22 may be electrically connected to one battery protection board 10, or all the battery cells 22 may be electrically connected to one battery protection board 10.

Since the battery module 20 has the battery protection sheet 10 of any one of the foregoing embodiments, the battery module 20 can produce the advantageous effects that the battery protection sheet 10 of the corresponding embodiment has.

In a particular scenario, the battery module 20 includes, but is not limited to, all kinds of primary batteries, secondary batteries, fuel cells, solar cells, and capacitor (e.g., supercapacitor) batteries. The battery module 20 may preferably be a lithium secondary battery including, but not limited to, a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, and a lithium ion polymer secondary battery. The battery module 20 of the embodiment of the present application may be in the form of a single battery or a plurality of batteries.

In another embodiment of the present application, an electrical device is provided, where the electrical device includes a load and the battery module 20 of any of the above embodiments, and the battery module 20 is configured to supply power to the load.

The electric device may be implemented in various specific forms, for example, in practical application scenarios, the electric device includes, but is not limited to, an electric tool, an unmanned aerial vehicle, an electric cleaning tool, an energy storage product, an electric vehicle, an electric bicycle, an electric navigation tool, and other electronic products.

It will be appreciated by those skilled in the art that the configuration according to the embodiments of the present application can be applied to stationary type electric devices in addition to elements specifically used for mobile purposes.

Since the electric equipment has the battery module 20 of any one of the foregoing embodiments, the electric equipment can produce the beneficial effects of the battery module 20 of the corresponding embodiment.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent structural changes made by using the contents of the specification and the drawings are included in the scope of the present application.

Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element, and that elements, features, or elements having the same designation in different embodiments may or may not have the same meaning as that of the other elements, and that the particular meaning will be determined by its interpretation in the particular embodiment or by its context in further embodiments.

In addition, although the terms "first, second, third, etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well. The terms "or" and/or "are to be construed as inclusive or meaning any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

Claims

1. A battery protection board includes a first circuit board and a second circuit board,

the first circuit board comprises a main body part and a connecting part, the thickness of the main body part is D in the thickness direction of the first circuit board, and the height difference H between the first surface of the connecting part and the first surface of the main body part is more than or equal to 0.15 and less than or equal to 0.5;

the second circuit board is connected with the first surface of the connecting part, and the first surface of the connecting part and the first surface of the main body part are positioned on the same side of the first circuit board.

2. The battery protection plate as claimed in claim 1, wherein the first surface of the connection part is provided with a soldering land, and the second circuit board is soldered to the first surface of the connection part through the soldering land.

3. The battery protection plate according to claim 1 or 2, wherein an orthogonal projection of an end portion of the second circuit board falls within the first surface of the connection portion in a thickness direction of the first circuit board, the battery protection plate further comprising a package body covering a connection region of the connection portion and the second circuit board.

4. The battery protection plate according to claim 3, wherein a height difference H between the first surface of the connecting portion and the first surface of the main body portion is greater than a thickness of the second circuit board, and the package body is lower than or flush with the first surface of the main body portion.

5. The battery protection plate according to claim 3, wherein the package body comprises a UV glue block, an injection molded rubber block, or an injection molded plastic block.

6. The battery protection plate as claimed in claim 1, wherein the first circuit board is a rigid circuit board and the second circuit board is a flexible circuit board.

7. A battery module comprising a battery cell and the battery protection plate of any one of claims 1 to 6, wherein the battery cell comprises an electrode assembly and a tab, the tab is electrically connected with the electrode assembly, and a conductive member of the battery protection plate is electrically connected with the tab.

8. The battery module of claim 7, wherein the first circuit board further comprises a conductive member disposed on one side of the main body, the conductive member is electrically connected to a tab of the battery cell, the first surface of the connecting portion faces the tab, and an end of the second circuit board is located between the connecting portion and the tab.

9. The battery module according to claim 8, wherein the thickness direction of the first circuit board is parallel to or perpendicular to the thickness direction of the battery core.

10. An electric device, comprising a load and the battery module according to any one of claims 7 to 9, wherein the battery module is configured to supply power to the load.