WO2016197567A1

WO2016197567A1 - Secondary electrochemical battery sealer body having packaged chip heat dissipation structure and battery

Info

Publication number: WO2016197567A1
Application number: PCT/CN2015/096612
Authority: WO
Inventors: 张清顺; 陈进添; 常海涛; 苏盛; 张志明
Original assignee: 福建南平南孚电池有限公司
Priority date: 2015-06-12
Filing date: 2015-12-08
Publication date: 2016-12-15

Abstract

Provided in the present invention is a secondary electrochemical battery sealer body having a packaged chip heat dissipation structure, for use in sealing an opening of a battery housing of a secondary electrochemical battery. The sealer body comprises: a negative electrode cap, a circuit board module, and an insulating washer. A recessed loop line structure is provided at an extremity of a battery housing in proximity to the negative electrode cap. The circuit board module is arranged between the loop line and the negative electrode cap. Multiple electronic components and a thermally-conductive wiring are provided on the circuit board module. The circuit board module is configured with the diameter thereof being sized between the inner diameter of a recess constituted by the loop line and the inner diameter of the battery housing, thus being fitted at a side of the loop line and used for sealing the opening part of the battery housing. The circuit board module is connected to the negative electrode cap via a thermally-conductive material and is used for thermal contact respectively with the negative electrode cap and the thermally-conductive wiring. The insulating washer has an ㄣ-shaped cross section and is arranged in a gap between both the battery housing and the circuit board module and the negative electrode cap, thus pressingly fixing the circuit board module between the loop line and the battery housing, and separating the battery housing form the negative electrode cap.

Description

Secondary electrochemical cell sealing body and battery with package type chip heat dissipation structure

Technical field

The invention relates to a secondary battery, in particular to a secondary electrochemical battery sealing body and a battery having a package type chip heat dissipation structure.

Background technique

In recent years, secondary batteries (also referred to as rechargeable batteries) have been widely used in various portable electrical devices and electronic devices, such as toys, handheld devices, etc., which place ever-increasing demands on the energy storage energy of secondary batteries. Lithium ion secondary batteries are gradually being applied in the above fields due to their high energy, high power discharge, and environmental protection.

The normal operation of the rechargeable battery often needs to cooperate with other functional integrated circuit chips, and has achieved the desired working effect. Usually, the rechargeable battery and the integrated circuit chip are separately packaged, and then connected together by the connection of the circuit board and the wires. In this way, there are many external components, many production processes, and high cost. The rechargeable battery and the integrated circuit chip are bulky and have poor performance, which is disadvantageous for miniaturization or miniaturization.

In the lithium ion secondary battery package, the space occupied by each part of the lithium ion secondary battery is relatively fixed, wherein the inside of the polymer battery core includes a positive electrode pole piece, a separator film and a negative electrode pole piece, and is at the positive electrode pole The sheet is sealed from the end of the separator with a specified height of the core, and the cell top seal occupies a certain height of the polymer cell, thereby reducing the effective space inside the polymer cell. The space utilization rate of the polymer battery has a great relationship with the energy density and capacity of the lithium ion secondary battery. Generally, the space utilization ratio of the polymer battery core is larger, and the energy density of the lithium ion secondary battery is The capacity is also large. Therefore, the conventional lithium ion secondary battery generally has a problem that the energy density and capacity of the lithium ion secondary battery are low due to the low space utilization ratio of the polymer battery.

Summary of the invention

The present invention provides a secondary electrochemical cell sealing body having a package type chip heat dissipating structure, the sealing body being used for closing an opening of a battery case of the secondary electrochemical cell, wherein the sealing body comprises: a negative electrode cap, a circuit board module and an insulating gasket, the battery case having a recessed twisted wire structure at an end thereof adjacent to the negative electrode cap; the circuit board module being located between the twisted wire and the negative electrode cap, a plurality of electronic components and a thermally conductive wiring for conducting heat conduction when the electronic component is operated, the circuit board module being sized to have an inner diameter of the recess formed by the twisted wire and an inner diameter of the battery case Interlocking on the side of the twisting wire for closing the opening of the battery case, the circuit board module and the negative electrode cap being connected by a heat conductive material for respectively contacting the negative electrode cap and the The thermal conductive wiring is in thermal contact; the cross section of the insulating gasket is

Forming a gap between the battery case, the circuit board module and the negative electrode cap, pressing the fixed circuit board module between the twisted wire and the battery case, and isolating the battery case and the negative cap .

Preferably, a solder connection is formed between the circuit board module and the negative electrode cap.

Preferably, the circuit board module has a metal substrate and a circuit copper-clad surface on both sides thereof, and the circuit copper-clad surface is provided with at least one heat-conducting hole for transferring heat from the circuit board away from the negative electrode cap. One side leads to a side close to the negative electrode cap, wherein the metal substrate is connected to an electronic component capable of generating heat and the circuit copper surface, and a circuit copper surface adjacent to the negative electrode cap side is connected to the circuit board module The part in contact with the negative electrode cap.

Preferably, the portion of the circuit board module that is in contact with the negative electrode cap has a shape of a "C" shape.

Preferably, the negative electrode cap is provided with a card slot on the other side of the rifling, and the number of the card slots is at least two for clamping and fixing the negative cap, and the card slot A layer of heat dissipation material is provided.

Preferably, a chuck corresponding to the position of the card slot is disposed at an edge of the negative electrode cap for fixing the negative cap on the circuit board module.

Preferably, the negative electrode cap is made of a thermally conductive material.

Preferably, the battery case is a steel case of a cylinder or a rectangular parallelepiped structure.

Preferably, the insulating gasket is a flexible and resilient annular insulating mat.

Preferably, said

A portion of the insulating gasket is used to squeeze the fixed circuit board module between the twisted wire and the battery case, and the other portion is used to isolate the battery case and the negative electrode cap.

Preferably, the ridge line has a recess depth of 0.2 to 1.2 mm with respect to the surface of the battery case.

Preferably, the sealing body is used for closing an opening of a battery case of the secondary electrochemical cell, the battery further comprising a battery core and a positive electrode cap, wherein the positive electrode cap is connected to the battery case a positive electrode of the secondary battery; the battery core is placed in the battery case between the positive electrode cap and the twisted wire structure.

The structure of the sealing body fitting for the electrochemical cell of the invention is ingenious and reasonable, and has an electrode cover at the electrode sealing of the electrochemical cell, and the electrode cover can cooperate with the circuit board to form a shielding structure, which can prevent the internal high frequency component pair External interference, and can transfer the heat generated by the circuit board to the outside, to protect the circuit board and components. In addition, a wire structure is arranged on the battery casing corresponding to the battery core and the circuit board for positioning the relative positions of the battery core and the circuit board, and is matched with the insulating gasket between the electrode cover and the battery case. The board is fixed without any soldering.

DRAWINGS

Further objects, features, and advantages of the present invention will be made apparent by the following description of the embodiments of the invention.

Figure 1a is a schematic view showing the structure of an electrochemical cell of the present invention.

Figure 1b is an exploded perspective view of an electrochemical cell of the present invention.

Figure 1c is a cross-sectional view of Figure 1a taken along the line A-A.

Figure 1d is a circuit diagram of a circuit board module of the present invention.

Fig. 2a schematically shows a perspective exploded view of a sealing body fitting 200 for an electrochemical cell of a first embodiment of the secondary electrochemical cell of the present invention.

Figure 2b is a schematic enlarged cross-sectional view of a closure body assembly 200 for an electrochemical cell of a first embodiment of a secondary electrochemical cell of the present invention.

Figure 3a is a schematic view showing the structure of a second embodiment of a secondary electrochemical cell according to the present invention.

Figure 3b is a schematic illustration of the split structure of a second embodiment of a secondary electrochemical cell in accordance with the present invention.

Figure 3c is a cross-sectional view of Figure 3b taken along line C-C.

4 is a perspective view of a sealing body fitting 400 for an electrochemical cell according to a third embodiment of the present invention; Body decomposition diagram.

FIG. 5 is a schematic structural view of a second printed circuit board in a third embodiment of the present invention.

detailed description

Objects and functions of the present invention, and methods for achieving the objects and functions will be clarified by referring to the exemplary embodiments. However, the invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of the description is merely to assist those skilled in the relevant art to understand the specific details of the invention.

It is to be understood that the foregoing general descriptions

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figures, the same reference numerals are used to refer to the same or similar parts, or the same or similar steps.

The present invention provides an electrochemical secondary battery, and FIGS. 1a and 1b are respectively a structural schematic view and an exploded perspective view of the electrochemical cell of the present invention. As shown in FIGS. 1a and 1b, an electrochemical cell 100 includes a battery case 101, a battery cell 102 disposed in the battery case 101, a negative electrode cap 103, and is disposed between the battery cell 102 and the negative electrode cap 103. The circuit board module 104 of the space and the positive electrode cap 105. The battery cell 102 is jacketed with a battery case 101 which is a cylindrical or rectangular steel case. According to an embodiment of the present invention, the positive electrode cap 105 is formed in a right-handed structure with the battery case 101 in a right-handed manner.

The circuit board module 104 is at least one printed circuit board (PCB) having a first side and a second side, wherein the first side is directed relative to the electrochemical cell 100 to the negative cap 103 and the second side is opposite the electrochemical Battery 100 is directed to cell 102. The PCB is a circuit board on which a wiring pattern is printed (as shown in FIG. 1d) and has a size substantially corresponding to the inner diameter of the casing of the battery 100. A plurality of printed conductors and components are disposed on a first side or a second side of the circuit board module 104. The circuit board module 104 is adjacent to the negative electrode cap 103 side of the battery 100 between the battery cell 102 and the negative electrode cap 103. The circuit board module 104 is provided with a connector to fix the negative electrode cap 103 to the circuit board module 104. For example, the negative electrode cap 103 may be fixed to the circuit board module 104 by soldering, or may be fixed by snapping or the like. The circuit board module is used for lithium battery charging protection, charging indication, and can also be used for battery discharge protection, short circuit protection, over discharge protection, and control output voltage.

Electrode connecting wires

108a and 108b are disposed between the circuit board module 104 and the battery cell 102, and the positive and negative electrodes of the battery are respectively taken out, wherein 108a is a positive connecting wire and 108b is a negative connecting wire. Figure 1c is a cross-sectional view of Figure 1a taken along the line AA. An insulating gasket 106 is disposed between the circuit board module 104 and the external battery case 101 between the negative electrode cap 103 and the battery case 101. The insulating gasket 106 is a flexible and resilient annular insulating mat layer having a shape along the cross section of the electrochemical cell 101A-A.

The insulating gasket 106 can function to isolate the battery case 101 as the first electrode and the negative electrode cap 103 as the second electrode, and can press and fix the circuit board module 104 due to the elastic action of the insulating pad layer 106, The gap between the battery case 101 and the negative electrode cap 103 is sealed. Specifically, as shown in FIG. 1c,

A portion of the shape is used to press the fixed circuit board module 104 between the twisted wire 107 and the battery case 101, and the other portion is used to isolate the battery case 101 and the negative electrode cap 103.

On the outer surface of the battery case 101, there is a ring-shaped inward annular recess corresponding to the position between the battery cell 102 and the printed circuit board 106, which is a twist line 107. The battery cell 102 is placed in the battery case 101 between the positive electrode cap 105 and the structure of the twist line 107. The arrangement of the insulating gasket 106 and the twist wire 107 allows the circuit board module 104 to be fixed between the annular recess of the battery case 101 and the bottom of the battery case 101, so that the connection of the battery case 101 and the negative electrode cap 103 does not require any soldering.

The structure of the twist line 107 is used to position the circuit board module 104. Specifically, the diameter of the circuit board module 104 is set to be between the inner diameter of the annular recess formed by the twist line 107 and the inner diameter of the battery case 101. In the case of a battery, the battery cell 102 is first placed in the battery case 101, and then the circuit board module 104 is assembled into the battery case 101. The size of the circuit board module 104 can be caught on the structure of the twisted wire 107 to avoid The contact of the battery cell 102, and then the battery case 101 and the negative electrode cap 103 are separated by the insulating pad layer 106, completing the assembly of the battery 100. The above structure allows the circuit board module 104 to form a closed space inside the battery case 101 for accommodating the battery cells 102 by means of the structure of the twisted wire 107, so that the volume of the battery cells 102 can be increased, thereby increasing the capacity of the secondary battery. . Preferably, the battery cell 102 is a hermetic structure, and operates by connecting the positive and negative electrodes from the inside of the battery cell 102 to the positive and negative terminals of the corresponding battery.

Preferably, the depth of the recessed line 107 with respect to the surface of the battery case 101 is 0.2-1.2 mm.

Fig. 2a schematically shows a perspective exploded view of a sealing body fitting 200 for an electrochemical cell of a first embodiment of the secondary electrochemical cell of the present invention. Fig. 2b is a schematic enlarged cross-sectional view showing a sealing body fitting 200 for an electrochemical cell of a first embodiment of the present invention. As shown in FIGS. 2a and 2b, the sealing body assembly 200 includes a first PCB 201, a second PCB 202, a negative electrode cap 203, and insulation disposed between the exterior of the second PCB 202 and the negative electrode cap 203 and the battery case 206. Washer 207. According to an embodiment of the invention, the first PCB 201 and the second PCB 202 are two printed circuit boards of the same area. The first PCB 201 is adjacent to the battery core 204, and the second PCB 202 is remote from the battery core 204. The first PCB 201 is stuck on the battery case 206 through the twist line 205. The second PCB 202 is electrically connected to the negative electrode cap 203 by a snap-fit structure disposed thereon, and constitutes a shield structure therewith. A plurality of chips or circuit components are disposed on a side of the first PCB 201 adjacent to the battery cell 204 and a side of the second PCB 202 remote from the battery core 204, wherein components that generate radiation during operation are disposed on the second PCB 202 is in the shielding structure composed of the negative electrode cap 203. An insulating gasket 207 is disposed between the outside of the second PCB 202 and the negative electrode cap 203 and the battery case 206. The insulating gasket 207 is a flexible annular insulating mat layer capable of squeezing and fixing the first PCB 201 and the second PCB 202 at the turns 205 to seal the gap between the battery case 206 and the negative electrode cap 103. At a portion where the battery case 206 is in contact with the first PCB and the second PCB, the contact tin plating 210 is reinforced to seal a gap between the circuit board and the battery case. A negative connection line 208b (208a is a positive connection line, not shown) that leads the battery cell 204 through the through hole 209 between the first PCB and the second PCB is connected to the wires on the first PCB and the second PCB. . The inner surface of the through hole 209 is plated with a conductive material, for example, copper plating, so that wiring of a plurality of circuit boards can be connected through the through holes 209 and connected to a portion where the negative electrode cap and the circuit board are in contact, thereby conducting the same. To the negative cap.

Since the structure of the secondary electrochemical cell according to the present invention is small, the area of the PCB placed inside the battery case is also small. Since a large number of electronic components are integrated on the PCB, the integration degree is high. Therefore, when the secondary electrochemical battery is charged, the electronic components may generate heat, which may cause the temperature of the PCB to rise, which is not conducive to the normal operation of the PCB. The above-described sealing body fitting 200 according to the present invention can effectively achieve heat dissipation of the PCB by a special structure provided. Specifically, a thermally conductive wiring (not shown in FIG. 2) for performing heat conduction when the electronic component is operated may be disposed on the PCB, for example, in the form of printed wiring. The PCB board is opposite to the twist line On the other side of the 205, that is, on the side of the second PCB 202 facing the negative electrode cap 203 as shown in FIG. 2, a card slot 208 is provided for engaging and fixing the negative electrode cap 203. In order to achieve good heat dissipation, the card slot 208 is provided with a layer of heat dissipating material, such as a layer of metal material, which is connected on the one hand to the negative cap to achieve thermal contact, and on the other hand to the PCB. The thermal conductive wiring for performing heat conduction during operation of the electronic component is in thermal contact, so that heat radiated by the electronic component during operation can be transferred to the negative electrode cap 203 via the heat conductive wiring and the card slot 208, and transmitted to the outside through the negative electrode cap 203. Conduct effective diffusion.

The negative electrode cap 203 is preferably made of a thermally conductive material to effectively diffuse heat generated by the electronic component. For example made of metal.

It will be understood by those skilled in the art that the closure body fitting 200 including the two PCBs shown in FIG. 2 is merely exemplary, and the sealing body fitting of the present invention is also applicable to the case of one PCB or a multilayer PCB combination.

3 is a further embodiment of a secondary electrochemical cell heat dissipation structure in accordance with the present invention. As shown in FIG. 3a, on the side away from the negative cap, the chips and components on the circuit board conduct heat during operation to the metal substrate 301 by contacting the metal substrate 301 on the circuit board, and then transfer it to the metal substrate 301. A circuit copper surface 302 soldered to a metal substrate. One or more heat conduction holes 303 are disposed on the circuit copper surface 302. The heat conduction holes 303 are through hole structures and are integrated with the circuit copper surface 302. Therefore, the heat generated by the chip and the component is finally transmitted to the heat conduction hole 303 on the copper-clad surface 302 of the circuit, and the heat is transmitted through the heat conduction hole 303 to the other side of the circuit board, that is, the side close to the negative electrode cap. Figure 3b is a schematic illustration of the split structure of a second embodiment of a secondary electrochemical cell in accordance with the present invention. As can be seen from Figure 3b, the edge of the negative cap 304 is soldered to the contact portion 306 of the circuit board 305 in contact therewith. Preferably, the shape of the contact portion is a "C" type ring shape. Similarly, the circuit board on the side close to the negative electrode cap has a heat dissipation structure corresponding to the circuit board on the side away from the negative electrode cap, that is, the metal substrate 301' and the circuit copper surface 302'. The heat conducting holes 303 communicate with the metal substrates 301 and 301' on both sides of the board, and the circuit copper faces 302 and 302'. At the same time, the circuit copper-clad surface 302' on the circuit board near the side of the negative electrode cap is connected to the contact portion 306 of the negative electrode cap and the circuit board. Thus, the heat generated when the chip away from the side of the negative electrode is operated can be transferred in the following manner: the metal substrate 301 - the circuit copper surface 302 - the heat conduction hole 303 - the circuit copper surface 302' - the contact portion of the negative electrode cap and the circuit board 306 - negative cap. Chip near the side of the negative cap The generated heat can be directly transmitted to the outside through the metal substrate 301'-the circuit copper-clad surface 302'-the negative electrode cap and the contact portion 306 of the circuit board-the negative electrode cap. Preferably, the material of the heat conduction hole 303 is a copper plating material. As shown in FIG. 3c, the heat of the heat generating chip and the electronic component can be conducted to the other side of the circuit board through the heat conduction hole 303, thereby being transmitted to the negative electrode cap.

4 is an exploded perspective view of a sealing body fitting 400 for an electrochemical cell according to a third embodiment of the present invention. The sealing body fitting 400 includes a first PCB 401, a second PCB 402, and a negative cap 403. A plurality of circuit components are disposed on the first PCB 401 and the second PCB 402. A plurality of small holes 404 are provided at edges of the first PCB 401 and the second PCB 402 for fixing the first PCB 401 and the second PCB 402 together. Preferably, the side of the second PCB 402 connected to the negative cap 403 has at least two card slots 405 (not shown) corresponding to the edge of the negative cap 403, and the edge of the negative cap 403 has the corresponding slot 405. The chuck 406 is used to fix the negative cap 403 on the second PCB 402 and can realize electrical connection and thermal contact. A contact portion of the second PCB 402 and the negative electrode cap 403 is disposed with a metal ring 501 (shown in FIG. 5), and the negative electrode cap 403 cooperates with the metal ring 501 to function as an electromagnetic shielding cover. The material of the negative electrode cap 403 is metal, and the heat generated during the operation of the components on the circuit board can be led out to the outside of the battery through the contact between the card slot 405 and the chuck 406, thereby functioning as a heat sink.

Other embodiments of the invention will be apparent to those skilled in the <RTIgt; The description and the examples are to be considered as illustrative only, and the true scope and spirit of the invention are defined by the claims.

Claims

A secondary electrochemical cell sealing body having a package type chip heat dissipation structure, the sealing body is used for closing an opening of a battery case of the secondary electrochemical cell, wherein the sealing body comprises: a negative electrode cap and a circuit Board module and insulating gasket,

The battery case has a concave twisted line structure at an end thereof adjacent to the negative electrode cap;

The circuit board module is located between the twist line and the negative electrode cap, and is provided with a plurality of electronic components and a heat conducting wiring for conducting heat conduction when the electronic component is operated, the diameter of the circuit board module Between the inner diameter of the recess formed by the twisted wire and the inner diameter of the battery case, so as to be stuck on the side of the twisted wire for closing the opening of the battery case, the circuit board module and the The negative electrode cap is connected by a heat conductive material for respectively in thermal contact with the negative electrode cap and the heat conducting wiring;

The circuit board module has a metal substrate and a circuit copper-clad surface on both sides thereof, and the circuit copper-clad surface is provided with at least one heat-conducting hole for guiding heat from the circuit board away from the side of the negative electrode cap To a side close to the negative electrode cap, wherein the metal substrate is connected to an electronic component capable of generating heat and the circuit copper surface, and a circuit copper surface close to a side of the negative electrode cap is connected to the circuit board module in contact with the negative electrode cap Part

The cross section of the insulating gasket is
Forming a gap between the battery case, the circuit board module and the negative electrode cap, pressing the fixed circuit board module between the twisted wire and the battery case, and isolating the battery case and the negative cap .
The secondary electrochemical cell sealing body according to claim 1, wherein a solder connection is provided between the circuit board module and the negative electrode cap.
The secondary electrochemical cell sealing body according to claim 1, wherein a portion of the circuit board module that is in contact with the negative electrode cap has a shape of a "C" shape.
The secondary electrochemical cell sealing body according to claim 1, wherein the negative electrode cap is provided with a card slot on the other side of the twisting wire, and the number of the card slots is at least two for the card. The negative electrode cap is connected and fixed, and a heat dissipation material layer is disposed in the card slot.
The electrochemical cell according to claim 4, wherein a chuck corresponding to a position of said card slot is provided at an edge of said negative electrode cap for fixing said negative cap on said circuit board module.
The secondary electrochemical cell sealing body according to claim 1, wherein the negative electrode cap is made of a heat conductive material.
The secondary electrochemical cell sealing body according to claim 1, wherein the battery case is a cylindrical or rectangular steel shell.
The secondary electrochemical cell seal of claim 1 wherein said insulating gasket is a flexible and resilient annular insulating mat.
The secondary electrochemical cell sealing body according to claim 1, wherein a portion of said insulating gasket is used for pressing a fixed circuit board module between said twisted wire and a battery case, and the other portion is for isolating the same. The battery case and the negative electrode cap are described.
The electrochemical cell of claim 1 wherein the ridge line has a recess depth of from 0.2 to 1.2 mm with respect to the surface of the battery housing.
A secondary electrochemical cell comprising the battery sealing body according to claim 1, wherein the sealing body is for closing an opening of a battery case of the secondary electrochemical cell, the battery further comprising a battery cell and Positive cap, where

Connecting the positive electrode cap to the battery case to form a positive electrode of the secondary battery;

The battery core is placed in the battery case between the positive electrode cap and the twisted wire structure.