Battery protection board, battery and electronic equipment

Abstract

The embodiment of the utility model provides a battery protection board, a battery and electronic equipment. Comprising a circuit board, cooling fins and a cooling shell. The circuit board is provided with a protruding part, and a conducting strip is arranged on the protruding part and used for being connected with a tab of the battery cell; the radiating shell is provided with a cavity and an opening communicated with the cavity, and the radiating fins are arranged in the cavity; the conducting strip and the protruding part of the circuit board are arranged at the opening, and the cooling fin is used for being attached to the tab. According to the utility model, the radiating fins are arranged at the upper parts of the tabs, the radiating areas of the circuit board and the conducting strips are enlarged through the cavity structure of the radiating shell, and heat generated by the circuit board and the conducting strips is radiated towards multiple directions, so that the working temperatures of the circuit board and the conducting strips are effectively reduced; therefore, the working temperature is kept within the threshold range of safe operation, and too high temperature rise caused by excessive heat production is avoided. Normal operation and structural stability of the circuit board are ensured, and safety accidents are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and specifically relates to a battery protection plate, a battery and an electronic device. Background Art

[0002] The battery protection board is integrated with the battery cell package. It is an integrated circuit board that protects the battery cell during charging and discharging. It has overcharge, over-discharge, over-current and short-circuit protection functions.

[0003] With the rapid development of battery fast charging technology, fast charging technology has also put forward higher requirements for battery heat dissipation. During operation, excessive temperature rise will have an adverse effect on the performance of circuit boards and battery cells.

[0004] The battery protection board will generate a certain amount of heat during operation. The relevant technology lacks effective heat dissipation measures to reduce the temperature of the battery protection board to maintain safe operation. Utility Model Content

[0005] The purpose of the embodiments of the utility model is to provide a battery protection board, a battery assembly and an electronic device, in order to solve the problem that the battery protection board in the related art lacks effective heat dissipation measures.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] In a first aspect, an embodiment of the utility model provides a battery protection board, including a circuit board, a heat sink and a heat dissipation housing;

[0008] The circuit board has a protruding portion, on which a conductive sheet is arranged, and the conductive sheet is used to connect the tab of the battery cell;

[0009] The heat dissipation shell has a cavity and an opening connected to the cavity. The heat sink is arranged in the cavity and connected to the heat dissipation shell. The conductive sheet and the protrusion of the circuit board are both arranged at the opening. The heat sink is used to attach the pole ear.

[0010] Optionally, heat dissipation holes are provided on the heat dissipation housing.

[0011] Optionally, the protruding portion of the circuit board is located on a side edge of the circuit board.

[0012] Optionally, the opening includes a first opening portion and a second opening portion that are interconnected;

[0013] The first opening is located at the bottom of the heat dissipation shell, and the second opening is located at the side of the heat dissipation shell; the conductive sheet is arranged at the first opening, and the second opening is used to extend the tab of the battery cell.

[0014] Optionally, the circuit board is provided with a positive conductive sheet and a negative conductive sheet, and each of the conductive sheets is connected to one of the heat dissipation shells.

[0015] Optionally, the circuit board includes a PCB and an FPC connected to each other;

[0016] The conductive sheet is disposed on the protruding portion of the PCB.

[0017] Optionally, the heat dissipation housing is an insulating heat dissipation housing.

[0018] In a second aspect, an embodiment of the utility model further provides a battery, including a battery cell and the battery protection board described in the above one;

[0019] The tabs of the battery cell are connected to the conductive sheet.

[0020] Optionally, the protrusion and / or the tab are bonded to the opening.

[0021] In a third aspect, an embodiment of the utility model further provides an electronic device, comprising the battery described in any one of the above embodiments.

[0022] In an embodiment of the utility model, the battery protection board includes a circuit board, a heat sink and a heat sink housing. A protrusion extends from one side of the circuit board, and a conductive sheet is provided on the protrusion. The heat sink housing has a cavity and an opening, the opening is connected to the cavity, and the heat sink is connected to the cavity. The connection structure between the conductive sheet and the protrusion is located at the opening and connected to the heat sink housing. The conductive sheet is used to connect the pole ear of the battery cell, and the heat sink is attached to the upper part of the pole ear. The heat sink absorbs and transfers the heat generated by the conductive sheet and the pole ear, and the heat is transferred to the outside through the heat sink housing. The cavity structure of the heat sink housing expands the heat dissipation area of ​​the circuit board and the conductive sheet, and allows the heat generated by the circuit board and the conductive sheet to dissipate in multiple directions, effectively reducing the operating temperature of the circuit board and the conductive sheet, so that the operating temperature is kept within the threshold range of safe operation, avoiding excessive heat generation resulting in excessive temperature rise, affecting the normal operation of the circuit board and even causing safety problems.

[0023] The battery provided in the embodiment of the utility model adopts the battery protection board provided in the above embodiment, which effectively reduces the operating temperature of the battery protection board, avoids excessive temperature rise of the protection board affecting the performance of the battery, meets the fast charging and heat dissipation requirements of the battery, and improves the battery life.

[0024] The electronic device provided by the embodiment of the utility model adopts the battery provided by the above embodiment, which effectively reduces the operating temperature of the battery and the electronic device and improves the performance and service life of the electronic device.

[0025] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 It is a schematic diagram of the structure of a battery protection board provided by an embodiment of the utility model;

[0028] Figure 2 It is an exploded diagram of the heat dissipation component structure in the embodiment of the utility model;

[0029] Figure 3 This is a schematic diagram of the connection structure between the battery protection board and the battery cell provided in an embodiment of the utility model;

[0030] Figure 4 In the present utility model embodiment Figure 3 Plan view along direction A.

[0031] Reference numerals:

[0032] 1-circuit board, 101-surface, 102-side, 11-PCB, 12-FPC, 111-conductive sheet, 112-soldering pad, 111a-positive conductive sheet, 111b-negative conductive sheet, 13-reinforcement steel sheet, 2-heat dissipation assembly, 21-heat dissipation sheet, 22-heat dissipation shell, 221-heat dissipation hole, 23-cavity, 24-opening, 241-first opening, 242-second opening, 3-battery cell, 31-ear. DETAILED DESCRIPTION

[0033] 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 part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0034] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0035] The battery protection board, battery and electronic device provided by the embodiments of the utility model are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0036] The utility model embodiment provides a battery protection board, referring to Figure 1 and Figure 3 , the battery protection board includes a circuit board 1, a heat sink 21 and a heat dissipation housing 22;

[0037] The circuit board 1 has a protruding portion, on which a conductive sheet 111 is disposed, and the conductive sheet 111 is used to connect to the tab 31 of the battery cell 3;

[0038] The heat dissipation housing 22 has a cavity 23 and an opening 24 connected to the cavity 23 . The heat sink 21 is disposed in the cavity 23 and connected to the heat dissipation housing 22 . The conductive sheet 111 and the protrusion of the circuit board 1 are both disposed at the opening 24 . The heat sink 21 is used to attach the pole ear 31 .

[0039] Specifically, if Figure 1 and Figure 2 As shown, the battery protection board includes a circuit board 1 and a heat dissipation component 2, and the heat dissipation component 2 includes a heat sink 21 and a heat dissipation shell 22. In this embodiment, the heat dissipation shell 22 is arranged in a cube shape, including but not limited to a cube or a cuboid. The heat dissipation shell 22 has a cavity 23 inside, and the heat dissipation shell 22 has an opening 24 connected to the cavity 23. The heat sink 21 is arranged in the cavity 23 and connected to the side wall of the heat dissipation shell 22, and the heat sink 21 is spaced apart from the top of the heat dissipation shell 22. The heat sink 21 is made of a heat-conducting material, including but not limited to metal, ceramic, silicone or carbon fiber composite material, and a thermally conductive adhesive can be applied on the surface of the heat sink 21 to improve its thermal conductivity. And the heat dissipation shell 22 has good thermal conductivity.

[0040] Specifically, if Figures 1 to 3As shown, a protrusion for non-electronic devices is provided on one side of the circuit board 1, and a conductive sheet 111 is located on the protrusion. The connection between the conductive sheet 111 and the circuit board 1 includes but is not limited to welding, pin or wire connection. Considering the convenience of operation, the embodiment of the utility model welds the conductive sheet 111 to the circuit board. The conductive sheet 111 is made of nickel sheet, which has the characteristics of conductivity, stability and corrosion resistance. It is used to carry and conduct electric charge. The conductive sheet 111 is bent into an L shape to meet the electrical connection requirements of different battery structures. The conductive sheet 111 is used to connect the pole ear 31 of the battery cell 3. The embodiment of the utility model welds the upper surface of the conductive sheet 111 to the pole ear 31 to form a current path between the battery cell 3 and the battery protection board to ensure the stable transmission of the charge inside the battery. After the conductive sheet 111 is welded to the pole ear 31, the heat sink 21 is attached to the upper part of the pole ear 31, so that the conductive sheet 111, the protrusion of the circuit board 1 and the pole ear 31 are located at the opening 24 and connected to the heat dissipation housing 22. Since the heat dissipation shell 22 has good thermal conductivity, during the operation of the battery, the heat generated by the circuit board 1 and the tab 31 rises in temperature, and the heat is transferred from the circuit board 1 and the tab 31 to the heat sink 21 and then transferred out from the side walls of the heat dissipation shell 22, thereby increasing the heat dissipation area and heat dissipation efficiency.

[0041] The battery protection board provided by the embodiment of the utility model includes a circuit board 1, a heat sink 21 and a heat dissipation housing 22. The protruding portion of the circuit board 1 is provided with a conductive sheet 111. The conductive sheet 111, the protruding portion of the circuit board 1 and the pole ear 31 are connected to the heat dissipation housing 22 at the opening 24, and the heat sink 21 is connected to the inside of the heat dissipation housing 22. After the protruding portion of the circuit board 1 is connected to the lower surface of the pole ear 31, the heat sink 21 is connected to the upper surface of the pole ear 31. The heat dissipation housing 22 is connected to the heat sink 21, and its cavity structure expands the heat dissipation area and heat dissipation efficiency, effectively reduces the operating temperature of the circuit board 1 and the conductive sheet 111, so that the operating temperature is kept within the threshold range of safe operation, avoiding excessive heat generation and excessive temperature rise. That is, to ensure the normal operation and structural stability of the circuit board, and avoid safety accidents.

[0042] Optionally, refer to Figure 1 and Figure 2 The heat dissipation housing 22 is provided with heat dissipation holes 221 .

[0043] Specifically, if Figure 1 and Figure 2As shown, at least a heat dissipation hole 221 is provided on the top of the heat dissipation housing 22, and a heat dissipation hole 221 can also be provided on the side wall. The heat dissipation hole 221 is a circular through hole, and the number of the heat dissipation hole 221 can be set to one, two or more. On the basis of ensuring the heat dissipation performance, the number of the heat dissipation holes 221 can be set according to actual needs of the heat dissipation housing 22. When the battery protection board is powered on, the conductive sheet 111 and the pole ear 31 transfer the heat to the heat dissipation sheet 21 by heat conduction. The heat dissipation sheet 21 absorbs the heat and discharges it to the air outside the heat dissipation housing 22 through the heat dissipation hole 221, thereby improving the heat dissipation efficiency of the heat dissipation assembly 2 and effectively reducing the operating temperature of the battery protection board.

[0044] Optionally, refer to Figure 1 , the protruding portion of the circuit board 1 is located on the side 102 of the circuit board 1 .

[0045] Specifically, if Figure 1 As shown, the surface 101 of the circuit board 1 is used to lay out electronic devices and related electrical circuits, and the conductive sheet 111 is arranged on the protruding portion of the circuit board 1, and the protruding portion extends out of the side 102 of the circuit board 1. The setting position of the conductive sheet 111 avoids the layout position of the electronic devices and electrical circuits, avoids the conductive sheet 111 from occupying too much layout space of the electronic devices and electrical circuits, improves the space utilization rate of the battery protection board, and can be used to set more electronic devices and electrical circuits, which is conducive to increasing the battery capacity. And the setting position of the conductive sheet 111 can be flexibly adjusted according to the layout position of the electronic devices and electrical circuits. The electronic device is integrated on the circuit board 1 and is the core component that plays the function of the battery protection board, including but not limited to MOS (MOSFET, metal-oxide semiconductor field effect transistor) switching devices, precision resistors, auxiliary devices and ID memory. Among them, the MOS switch controls the switch on and off by detecting the battery cell voltage or loop current to protect the safety of the battery cell.

[0046] Optionally, refer to Figures 2 to 4 , the opening 24 includes a first opening portion 241 and a second opening portion 242 which are connected to each other;

[0047] The first opening 241 is located at the bottom of the heat dissipation housing 22 , and the second opening 242 is located at the side of the heat dissipation housing 22 ; the conductive sheet 111 is disposed at the first opening 241 , and the second opening 242 is used to extend into the tab 31 of the battery cell 3 .

[0048] Specifically, if Figures 2 to 4As shown, the bottom of the heat dissipation housing 22 is provided with a first opening 241, and the side of the housing is provided with a second opening 242, and the first opening 241 and the second opening 242 form an L-shaped opening 24. In some embodiments, after the conductive sheet 111, i.e., the nickel sheet, is welded to the pole lug 31, the first opening 241 of the heat dissipation housing 22 is aligned with the conductive sheet 111 and the pole lug 31, so that the heat dissipation fin 21 is attached to the upper surface of the pole lug 31, and at the same time, the pole lug 31 extends from the second opening 242 of the housing. The opening height of the second opening 242 is consistent with the thickness of the pole lug 31 or slightly greater than the thickness of the pole lug 31. Therefore, the first opening 241 and the second opening 242 are provided to facilitate the assembly connection between the heat dissipation housing 22 and the conductive sheet 111 and the pole lug 31, and the heat dissipation fin 21 can be effectively attached to the upper part of the pole lug 31, thereby improving the heat dissipation efficiency of the pole lug 31 and the circuit board 1.

[0049] Optionally, refer to Figure 1 The circuit board 1 is provided with a positive conductive sheet 111 a and a negative conductive sheet 111 b , and each of the conductive sheets 111 is connected to one of the heat dissipation shells 22 .

[0050] Specifically, if Figure 1 As shown, a positive conductive sheet 111a and a negative conductive sheet 111b are arranged at intervals along the length direction of one side of the circuit board 1. The positive conductive sheet 111a is used to connect to the positive pole ear 31 of the battery cell 3, and the negative conductive sheet 111b is used to connect to the negative pole ear 31 of the battery cell 3. A current path is formed between the battery protection board and the positive and negative poles of the battery cell, so as to realize the protection function of the battery protection board during the charging and discharging process of the battery cell. Each conductive sheet 111 and the protruding part of the circuit board 1 are connected to a heat dissipation housing 22, and a heat sink 21 is arranged in each heat dissipation housing for attachment and connection with the pole ear 31. Balanced heat dissipation and cooling of the positive conductive sheet 111a and the negative conductive sheet 111b are realized.

[0051] Optionally, refer to Figure 1 , the circuit board 1 includes a PCB 11 and a FPC 12 connected to each other;

[0052] The conductive sheet 111 is disposed on the protruding portion of the PCB.

[0053] Specifically, if Figure 1As shown, the circuit board 1 includes a PCB (Printed Circuit Board) and an FPC (Flexible Printed Circuit) connected to each other, wherein the PCB is the main support of the electrical components and has a relatively hard texture; the FPC is a printed circuit board made of polyimide or polyester film as a substrate with good reliability and flexibility, and has the characteristics of high wiring density, light weight, thin thickness, good bending, and a relatively soft texture. The conductive sheet 111 is arranged on the PCB11. A hard board pad 112 is arranged on the protruding portion of the PCB, and a soft board pad is arranged on the FPC12. The hard board pad 112 and the soft board pad are welded and connected to connect the PCB and the FPC to form a current path between the two boards. The shape of the pad includes but is not limited to square, circular, island, polygonal, elliptical, open or other irregular shapes. In order to improve the convenience of welding operation, the present embodiment mainly adopts a square pad. In addition, conductive glue can be bonded between the PCB and the FPC in the form of dispensing glue to strengthen the connection strength between the PCB and the FPC. Reinforcing steel sheets 13 are connected to the front of both sides of the FPC to enhance the structural strength of the FPC. Connectors are provided at the corresponding positions of the reinforcing steel sheets 13 on the back of both sides of the FPC for electrical connection with electrical equipment to form a current path between the battery cell, the protection board and the electrical equipment to realize the charging and discharging function of the battery cell. The two sides are respectively the positive connector and the negative connector.

[0054] Optionally, the heat dissipation housing 22 is an insulating heat dissipation housing.

[0055] Specifically, the heat dissipation housing 22 is made of a heat-conducting insulating material, including but not limited to alumina ceramics, silicone rubber or PI film (Polyimide film), which has excellent thermal conductivity, high withstand voltage insulation and strong mechanical properties. The heat dissipation housing 22 is wrapped around the outside of the heat sink 21, and on the basis of ensuring the heat dissipation performance, the battery protection board is insulated and isolated from the external equipment to avoid the unsafe problem caused by the leakage of the conductive sheet 111.

[0056] Reference Figure 3 and Figure 4 , the embodiment of the utility model further provides a battery, comprising a battery cell 3 and a battery protection board as described in any of the above embodiments;

[0057] The tab 31 of the battery cell 3 is connected to the conductive sheet 111 .

[0058] Specifically, if Figure 3 and Figure 4The connection structure between the battery protection board and the battery cell 3, i.e., the schematic diagram of the battery structure, is shown. After the conductive sheet 111, i.e., the nickel sheet, is welded to the pole ear 31, the heat sink 21 is connected to the upper part of the pole ear 31. The cavity structure of the heat dissipation housing 22 expands the heat dissipation area of ​​the circuit board 1 and the conductive sheet 111, and allows the heat generated when the circuit board 1 and the conductive sheet 111 are powered on to be dissipated in multiple directions, effectively dissipating the heat of the circuit board 1 and the conductive sheet 111 and reducing their operating temperature. Further, the battery cell 3 and the battery protection board are packaged to form a battery structure. Since the battery protection board is provided with electronic components and electrical circuits, the system is turned on and off by detecting the battery cell voltage or loop current to protect the power safety of the battery cell 3.

[0059] Optionally, refer to Figure 3 and Figure 4 The protrusion and / or the tab 31 are bonded to the opening 24 .

[0060] Specifically, if Figure 3 and Figure 4 As shown, the protrusion of the circuit board 1 and / or the ear 31 are bonded to the heat dissipation housing 22 at the opening 24. In order to improve the bonding strength and heat dissipation performance, the embodiment of the utility model adopts thermal conductive silicone or AD glue (acrylic hot melt adhesive) to bond the heat dissipation housing 22 and the ear 31 or the protrusion of the circuit board 1.

[0061] In some embodiments, the following steps are used to assemble and connect the heat dissipation component 2, the circuit board 1 and the tab 31.

[0062] Step 1: Weld the conductive sheet 111 , ie the nickel sheet, to the lower surface of the tab 31 .

[0063] Step 2: The heat dissipation housing 22 covers the upper part of the conductive sheet 111 and the pole tab 31 , and makes the heat dissipation sheet 21 attached to the upper surface of the pole tab 31 , while the pole tab 31 extends out from the second opening 242 .

[0064] Step 3: At the first opening 241 , the protruding portion and the tab of the circuit board 1 are bonded to the heat dissipation housing 22 at the same time to enhance the structural connection strength and heat dissipation efficiency.

[0065] An embodiment of the utility model further provides an electronic device, comprising the battery described in any one of the above embodiments.

[0066] The electronic device provided in the embodiment of the utility model is a 3C electronic device, including computer products, communication products and consumer electronic products, such as laptop computers, tablet computers, cameras, mobile phones, digital audio players, wireless data communication devices, video game devices, smart wearable devices, etc. The electronic device adopts the battery of any of the above embodiments to improve the heat dissipation efficiency, effectively reduce the operating temperature of the circuit board and the conductive sheet, and improve the performance and service life of the electronic device.

[0067] 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.

[0068] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A battery protection board, characterized in that: It comprises a circuit board (1), a heat sink (21) and a heat dissipation housing (22); The circuit board (1) has a protruding portion, a conductive sheet (111) is provided on the protruding portion, and the conductive sheet (111) is used to connect to a tab (31) of a battery cell (3); The heat dissipation housing (22) has a cavity (23) and an opening (24) communicating with the cavity (23); the heat dissipation fin (21) is arranged in the cavity (23) and connected to the heat dissipation housing (22); The conductive sheet (111) and the protruding portion of the circuit board (1) are both arranged at the opening (24) and connected to the heat dissipation housing (22); the heat dissipation sheet (21) is used to attach the pole ear (31).

2. The battery protection board according to claim 1, characterized in that: The heat dissipation housing (22) is provided with heat dissipation holes (221).

3. The battery protection board according to claim 1, characterized in that: The protruding portion of the circuit board (1) is located on a side edge (102) of the circuit board (1).

4. The battery protection board according to claim 1, characterized in that: The opening (24) comprises a first opening portion (241) and a second opening portion (242) which are connected to each other; The first opening (241) is located at the bottom of the heat dissipation shell (22), and the second opening (242) is located at the side of the heat dissipation shell (22); the conductive sheet (111) is arranged at the first opening (241), and the second opening (242) is used to extend into the pole ear (31) of the battery cell (3).

5. The battery protection board according to claim 1, characterized in that: The circuit board (1) is provided with a positive electrode conductive sheet (111a) and a negative electrode conductive sheet (111b), and each of the conductive sheets (111) is connected to one of the heat dissipation shells (22).

6. The battery protection board according to claim 1, characterized in that: The circuit board (1) comprises a PCB (11) and an FPC (12) which are connected to each other; The conductive sheet (111) is arranged on the protruding portion of the PCB (11).

7. The battery protection board according to claim 1, characterized in that: The heat dissipation housing (22) is an insulating heat dissipation housing.

8. A battery, characterized in that: Comprising a battery cell and a battery protection plate as claimed in any one of claims 1 to 7; The pole lug (31) of the battery cell (3) is connected to the conductive sheet (111).

9. The battery according to claim 8, characterized in that The protrusion and / or the pole ear (31) are bonded to the opening (24).

10. An electronic device, characterized in that: A battery comprising the battery of claim 8 or 9.

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