TWI818710B - Conductive frame of batteries - Google Patents

Abstract

The invention provides a conductive frame of batteries, which includes a conductive sheet, a plurality of first protruding welding portions and a fixing unit. The first protruding welding portions are arranged on a first surface of the conductive sheet, and the conductive sheet is connected to at least one battery cell through the first protruding welding portion. The fixing unit includes a fixing potion and a pressing potion, wherein the fixing potion is connected to the battery cell, and the pressing potion is configured to press a second surface of the conductive sheet to improve the connection strength between the conductive sheet and the battery cell, and avoid separation of the conductive sheet and the battery cell.

Description

Battery conductive frame

The invention provides a battery conductive frame for connecting the battery core, which can improve the connection strength with the battery core and prevent the battery conductive frame from being separated from the battery core.

Secondary batteries mainly include nickel metal hydride batteries, nickel cadmium batteries, lithium ion batteries, and lithium polymer batteries. Lithium batteries have high energy density, high operating voltage, wide operating temperature range, no memory effect, long life, and can be charged multiple times. It has the advantages of discharge and other advantages, and is widely used in portable electronic products such as mobile phones, notebook computers, digital cameras, etc. In recent years, it has also expanded to the automotive field.

The structure of the battery cell (Cell) mainly includes positive electrode material, electrolyte, negative electrode material, isolation layer and casing. The isolation membrane separates the positive electrode material and negative electrode material to avoid short circuit, and the electrolyte is set in the porous isolation membrane. , and works as a conductor of ionic charges. The casing is used to cover the above-mentioned positive electrode material, isolation film, electrolyte and negative electrode material. Generally speaking, the casing is usually made of metal material.

When in use, a plurality of battery cells are connected in series and/or in parallel through the battery conductive frame to form a battery pack, so that the battery pack can output the voltage required by the product. Generally speaking, the battery conductive frame and the battery core are connected by electric welding. During the welding process, the temperature of the battery conductive frame and the battery core needs to be increased, and the battery conductive frame is applied to the positive electrode/or negative electrode casing of the battery cell. Press to complete the connection between the battery conductive frame and the battery core. However, during the process of welding or using the battery pack, external forces may cause the battery conductive frame and battery core to become loose, causing the battery pack to fail to function normally.

One object of the present invention is to provide a battery conductive frame, which mainly includes a conductive sheet and a fixed unit, wherein the conductive sheet is welded to the battery core through at least a first protruding welding portion and used to connect a plurality of battery cells in series or parallel. The fixing unit can also connect the battery core through welding, and contact and press some or all of the conductive sheets to strengthen the connection strength between the conductive sheets and the battery core. Through the arrangement of the battery conductive frame of the present invention, the battery conductive frame and the battery core can be effectively prevented from becoming loose due to external forces during the process of making or using the battery pack, and the reliability of the product can be effectively improved. Spend.

In order to achieve the above object, the present invention proposes a battery conductive frame, which includes: a conductive sheet including a first surface and a second surface, wherein the first surface and the second surface are two facing surfaces; a plurality of The first protruding welding portion is provided on the first surface of the conductive sheet and is used to connect a plurality of battery cells; and a fixing unit includes a fixing portion and at least one pressing portion, wherein the fixing portion is used to connect the battery cells, and The pressing part is used to press the conductive sheet.

In at least one embodiment of the present invention, the pressing portion of the fixing unit overlaps the first protruding welding portion of the conductive sheet.

In at least one embodiment of the present invention, at least one second protruding welding portion is located on the pressing portion of the fixing unit, and the pressing portion of the fixing unit is connected to the second surface of the conductive sheet through the second protruding welding portion.

In at least one embodiment of the present invention, at least one third protruding welding portion is located on the fixing portion of the fixing unit, and the fixing portion of the fixing unit is connected to the battery core through the third protruding welding portion.

In at least one embodiment of the present invention, the fixing unit includes two fixing parts, respectively connected to different battery cells.

In at least one embodiment of the present invention, there are a plurality of fixed units, each of which is connected to a plurality of battery cells.

In at least one embodiment of the present invention, the fixing unit includes two pressing parts, and the same battery cell is connected through the two pressing parts.

In at least one embodiment of the present invention, the conductive sheet includes a plurality of branches, and the first protruding welding portion is disposed on the branches.

In at least one embodiment of the present invention, the electrical conductivity of the fixed unit is smaller than that of the conductive sheet.

In at least one embodiment of the present invention, the thickness of the fixing unit is smaller than the conductive sheet.

Please refer to FIGS. 1 and 2 , which are respectively a schematic cross-sectional view and a top perspective view of an embodiment of a battery conductive frame and a battery cell according to the present invention. The battery conductive frame 10 is mainly used to connect a plurality of battery cells 12, and includes a conductive sheet 11 and at least one fixing unit 13, wherein the conductive sheet 11 is used to connect a plurality of battery cells 12 in series or in parallel.

Generally speaking, the conductive sheet 11 is usually made of a metal material with low resistance and high conductivity, such as copper, to reduce energy loss caused by the battery core 12 charging and discharging through the conductive sheet 11 .

In practical applications, the conductive sheet 11 and the casing 121 of the battery core 12 are mainly connected by welding, such as resistance welding. Welding is a process technology for joining dissimilar metals by heating or pressurizing. When the conductivity of the conductive sheet 11 is high, it may be unfavorable to weld the conductive sheet 11 and the battery core 12 through resistance welding.

The conductive sheet 11 includes a first surface 111 and a second surface 113. The first surface 111 and the second surface 113 are two surfaces facing each other on the conductive sheet 11. For example, the first surface 111 is a lower surface, and the second surface 113 is a lower surface. Surface 113 is the upper surface. A plurality of first protruding welding parts 115 are provided on the first surface 111 of the conductive sheet 11 , wherein the first protruding welding parts 115 may be bumps protruding from the first surface 111 of the conductive sheet 11 and used to connect battery cells. 12.

In one embodiment of the present invention, the first protruding welding portion 115 can be formed on the first surface 111 of the conductive sheet 11 by stamping, and at least one recessed portion is formed on the second surface 113 of the conductive sheet 11, wherein The position of the recessed portion corresponds to the position of the first protruding welding portion 115 .

Of course, forming the first protruding welding portion 15 on the conductive sheet 11 by stamping is only an embodiment of the present invention and does not limit the scope of the present invention. In practical applications, the conductive sheet 11 can be made in other ways, such as casting the conductive sheet 11 and the first protruding welding portion 115 , in which there will be no recessed portion on the second surface 113 of the conductive sheet 11 .

During the welding process, the first protruding welding portion 115 of the conductive sheet 11 can first be connected to the case 121 of the battery cell 12 , where the case 121 is made of metal, for example, the positive electrode or the negative electrode of the case 121 is connected. The welding current is then delivered to the conductive sheet 11 , the first protruding welding portion 115 and the casing 121 of the battery core 12 , so that the temperatures of the first protruding welding portion 115 of the conductive sheet 11 and the contacting casing 121 rise.

When the temperatures of the conductive sheet 11 , the first protruding welding portion 115 and the casing 121 of the battery core 12 reach a specific value, they will melt to form a molten pool. Then, pressure is applied to the casing 121 of the battery core 12 through the conductive sheet 11 and the first protruding welding part 115, so that the first protruding welding part 115 sinks into the casing 121 of the battery core 12. After the temperatures of the welding portion 115 and the casing 121 of the battery core 12 drop, the connection between the conductive sheet 11 and the battery core 12 is completed.

Although the connection between the conductive sheet 11 and the battery core 12 can be completed through the above method, the conductive sheet 11 and the battery core 12 are only connected through the first protruding welding portion 115 and the contact point of the battery core 12, resulting in The connection relationship between the conductive sheet 11 and the battery core 12 is not firm, and may cause the conductive sheet 11 to separate from the battery core 12 during subsequent manufacturing or use.

In practical applications, the conductive sheet 11 is usually connected to a plurality of battery cells 12 in sequence. For example, after one end of the conductive sheet 11 is connected to the battery cell 12 on the left side of Figure 1, the other end of the conductive sheet 11 is connected to the battery cell 12 through welding. Cell 12 on the right.

As shown in the above-mentioned welding sequence of the conductive sheet 11 and the plurality of battery cells 12, the conductive sheet 11 usually exerts pressure on the battery cell 12 during the process of connecting the battery cell 12 on the right side. Although the pressure exerted by the conductive sheet 11 on the battery core 12 is usually not too great, the connection between the conductive sheet 11 and the battery core 12 is only the first protruding welding portion 115 and its contact point. In addition, there is a certain distance between the conductive sheet 11 and the two battery cells 12, so that the pressure exerted by the conductive sheet 11 on the battery cell 12 on the right side will cause the first protrusion connecting the conductive sheet 11 and the battery cell 12 on the left side. The welding portion 115 creates a moment and may cause the conductive sheet 11 to separate from the battery cell 12 on the left side.

In order to avoid the above situation, the present invention further provides a fixing unit 13 on the conductive sheet 11 and the battery core 12 . The fixing unit 13 includes a fixing part 131 and a pressing part 133. The fixing part 131 is used to connect the housing 121 of the battery cell 12, and the pressing part 133 is used to contact and press the conductive sheet 11 to increase the number of conductive sheets. 11 and the connection strength between the battery cell 12.

In an embodiment of the present invention, the fixing unit 13 may be a metal sheet, in which the fixing part 131 and the pressing part 133 have different heights. For example, the fixing part 131 is connected to the pressing part 133 through a connecting part 132, wherein the fixing part 131 is connected to the pressing part 133 through a connecting part 132. 131 is approximately parallel to the pressing part 133, and the connecting part 132 has an included angle greater than 90 degrees with the fixing part 131 and the pressing part 133. In the drawings of the present invention, the included angle is 90 for description, so that the fixing unit 13 The cross section is stepped.

In addition, in the drawings of the present invention, the connecting portion 132 of the fixing unit 13 will fit against the side of the conductive sheet 11 , but in different embodiments, there may be a gap between the connecting portion 132 of the fixing unit 13 and the conductive sheet 11 .

In practical applications, after the conductive sheet 11 is connected to one of the battery cells 12 , a fixing unit 13 can be provided on the battery cell 12 connected to the conductive sheet 11 to strengthen the connection relationship between the conductive sheet 11 and the battery core 12 . Then, the conductive sheet 11 is connected to another or other battery cores 12 to prevent the conductive sheet 11 from being separated from the connected battery core 12 during the process of connecting the conductive sheet 11 to other battery cells 12 .

In the embodiment of the present invention, there are a plurality of fixed units 13 and battery cells 12 , and each fixed unit 13 is connected to each battery cell 12 respectively.

The fixing portion 131 of the fixing unit 13 can be connected to the casing 121 of the battery cell 12 through welding, and the pressing portion 133 of the fixing unit 13 can also be connected to the conductive sheet 11 through welding, such as resistance welding. Therefore, after the welding between the first surface 111 of the conductive sheet 11 and the casing 121 of the battery cell 12 is completed using the welding equipment, the fixing unit 13 can be welded to the casing 121 of the battery cell 12 and the conductive sheet 11 using the same welding equipment. Second surface 113.

The fixing unit 13 is mainly used to fix the conductive sheet 11 on the battery core 12 and is not used to transmit current. Therefore, the fixing unit 13 can be made of metal with low conductivity to facilitate the connection of the fixing unit 13 and the battery core 12 with the conductive sheet 11 through welding. For example, the fixing unit 13 can be a nickel sheet. Specifically, the electrical conductivity of the fixing unit 13 can be smaller than that of the conductive sheet 11 , and the thickness of the fixing unit 13 can also be smaller than that of the conductive sheet 11 .

In an embodiment of the present invention, at least one second protruding welding portion 135 can be provided on the surface of the pressing portion 133 of the fixing unit 13 , wherein the pressing portion 133 is connected to the second protruding welding portion 135 of the conductive sheet 11 via the second protruding welding portion 135 . Surface 113. The arrangement of the second protruding welding portion 135 facilitates the connection of the pressing portion 133 of the fixing unit 13 and the second surface 113 of the conductive sheet 11 through welding.

In addition, at least one third protruding welding portion 137 can also be provided on the surface of the fixing portion 131 of the fixing unit 13 , wherein the fixing portion 131 is connected to the battery core 12 through the third protruding welding portion 137 . The fixing unit 13 including the second protruding welding portion 135 and the third protruding welding portion 137 is only an embodiment of the present invention and does not limit the scope of the present invention.

In addition, the pressing part 133 of the fixing unit 13 can cover the conductive sheet 11 above the first protruding welding part 115, so that the pressing part 133 overlaps the first protruding welding part 115, which is conducive to further strengthening the conductive sheet through the fixing unit 13 11 and the connection between battery cell 12.

In the above embodiment of the present invention, the fixing unit 13 is made of metal, and is connected to the battery core 12 and the conductive sheet 11 through welding. In different embodiments, the fixing unit 13 may also be non-metal. For example, the fixing unit 13 may be made of plastic, and may be connected to the battery core 12 and/or the conductive sheet 11 through gluing or ultrasonic welding. The fact that the fixing unit 13 is made of metal is only an embodiment of the present invention and does not limit the scope of the present invention.

In addition, when the fixing unit 13 connects the battery core 12 and the conductive sheet 11 through gluing or ultrasonic welding, the second protruding welding portion 135 and the third protruding welding portion 137 do not need to be provided on the fixing unit 13 .

In the embodiment of FIG. 2 of the present invention, the appearance of the conductive sheet 11 is approximately fork-shaped, and there are a plurality of branches 117 at the end of the conductive sheet 11, where there is a gap 112 between adjacent branches 117, for example, the conductive sheet A plurality of branches 117 are provided at both ends of 11. The first protruding welding portions 115 are respectively provided on each branch 117 of the conductive sheet 11 , wherein a plurality of branches 117 located at the same end of the conductive sheet 11 are used to connect the same battery cell 12 .

As shown in Figures 3 and 4, the main difference between the embodiment of the present invention and Figures 1 and 2 is that in the embodiments of Figures 1 and 2, each battery cell 12 is provided with a fixing unit 13, wherein the fixing unit 13 and The number of battery cells 12 is the same, and the connection relationship between the end of the conductive sheet 11 and the battery cells 12 is strengthened through the fixing unit 13 .

In the embodiments of FIG. 3 and FIG. 4 , a plurality of battery cells 12 share the same fixing unit 13 . In the embodiment of the present invention, the fixing unit 13 includes two fixing parts 131 and a pressing part 133. The two fixing parts 131 of the fixing unit 13 are respectively connected to different battery cells 12, and the pressing part 133 spans the conductive Both ends of piece 11. The pressing portion 133 is used to contact and cover part or all of the second surface 113 of the conductive sheet 11 , and press the conductive sheet 11 toward the battery core 12 .

Specifically, the fixing unit 13 will be disposed along the conductive sheet 11, and the two fixing parts 131 of the fixing unit 13 are respectively welded to two different battery cells 12. The pressing part 133 of the fixing unit 13 does not need to be welded to the conductive sheet. on the second surface 113 of 11 . In different embodiments, the pressing portion 133 of the fixing unit 13 can also be welded to the second surface 113 of the conductive sheet 11 to further enhance the fixing effect of the fixing unit 13 .

As shown in FIGS. 5 and 6 , in the embodiment of the present invention, each battery cell 12 is provided with a fixing unit 13 , where the number of fixing units 13 and battery cells 12 is the same. The fixing unit 13 of this embodiment includes two fixing parts 131 and a pressing part 133. The two fixing parts 131 of the fixing unit 13 are connected to the same battery cell 12, and the pressing part 133 contacts and covers the conductive sheet 11. The conductive sheet 11 is pressed onto the second surface 113 toward the battery core 12 .

Since the fixing portions 131 at both ends of the fixing unit 13 are welded to the housing 121 of the same battery cell 12 , the pressing portion 133 of the fixing unit 13 does not need to be welded to the second surface 113 of the conductive sheet 11 . In different embodiments, the pressing portion 133 of the fixing unit 13 can also be welded to the second surface 113 of the conductive sheet 11 to further enhance the fixing effect of the fixing unit 13 .

The above is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. That is, all changes in shape, structure, characteristics and spirit described in the patent scope of the present invention may be equal to those described above. Modifications should be included in the patentable scope of the present invention.

10:Battery conductive frame

11: Conductive sheet

111: First surface

112:Interval

113: Second surface

115: First protruding welding part

117: Branch

12:Battery core

121: Shell

13: Fixed unit

131: Fixed part

132:Connection part

133: Pressing part

135: The second protruding welding part

137: The third protruding welding part

[Fig. 1] is a schematic cross-sectional view of an embodiment of the battery conductive frame and battery core of the present invention.

[Fig. 2] is a top perspective view of the battery conductive frame and battery core according to the above embodiment of the present invention.

[Fig. 3] is a schematic cross-sectional view of another embodiment of the battery conductive frame and battery core of the present invention.

[Fig. 4] is a top perspective view of the battery conductive frame and battery core according to the above embodiment of the present invention.

[Fig. 5] is a schematic cross-sectional view of another embodiment of the battery conductive frame and battery core of the present invention.

[Fig. 6] is a top perspective view of the battery conductive frame and battery core according to the above embodiment of the present invention.

10:Battery conductive frame

11: Conductive sheet

111: First surface

113: Second surface

115: First protruding welding part

12:Battery core

121: Shell

13: Fixed unit

131: Fixed part

132:Connection part

133: Pressing part

135: The second protruding welding part

137: The third protruding welding part

Claims (10)

A battery conductive frame includes: a conductive sheet including a first surface and a second surface, wherein the first surface and the second surface are two facing surfaces; a plurality of first protruding welding parts, Disposed on the first surface of the conductive sheet and used to connect a plurality of battery cells; and at least one fixing unit, each of the fixing units includes at least one fixing part and a pressing part, wherein the fixing part is used to connect the battery core, and the pressing part is used to press the conductive sheet. The battery conductive frame of claim 1, wherein the pressing portion of the fixing unit passes through the conductive sheet to be stacked above the first protruding welding portion of the conductive sheet. The battery conductive frame according to claim 1, including at least a second protruding welding portion located on the pressing portion of the fixing unit, and the pressing portion of the fixing unit is connected to the conductive portion through the second protruding welding portion. the second surface of the piece. The battery conductive frame of claim 3 includes at least a third protruding welding portion located on the fixing portion of the fixing unit, and the fixing portion of the fixing unit is connected to the battery core through the third protruding welding portion. The battery conductive frame according to claim 1, wherein the fixing unit includes two fixing parts, respectively connected to different battery cells. The battery conductive frame as claimed in claim 1, wherein there are a plurality of fixing units, which are respectively connected to the plurality of battery cells. The battery conductive frame according to claim 6, wherein the fixing unit includes two fixing parts and is connected to the same battery core via the two fixing parts. The battery conductive frame of claim 1, wherein the conductive sheet includes a plurality of branches, and the first protruding welding portion is disposed on the branches. The battery conductive frame as claimed in claim 1, wherein the conductivity of the fixing unit is smaller than that of the conductive sheet. The battery conductive frame as claimed in claim 1, wherein the thickness of the fixing unit is smaller than that of the conductive sheet.

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