TWI723746B - Conductive frame of batteries - Google Patents

Abstract

The invention provides a conductive frame of batteries for connecting a plurality of battery cells, wherein the conductive frame includes a first conductive portion and a plurality of second conductive portions. The first conductive portion is provided with a plurality of connection holes. The second conductive portions are respectively provided in the connection holes of the first conductive portion, and form a plurality of protruding parts on the surface of the first conductive portion, wherein the resistance of the second conductive portion is greater than the first conductive portion. The protruding parts on the first conductive part are connected to the battery cell by resistance welding. The second conductive part has a larger resistance value, and thus the current for resistance welding can be reduced to conserve energy and avoid battery cell damage during the welding process.

Description

Battery conductive frame

The invention provides a battery conductive frame for connecting battery cores, which can reduce the energy consumed in the connection process and avoid damage to the battery cores.

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, large operating temperature range, no memory effect, long life, and can be charged multiple times. Discharge and other advantages, and are widely used in portable electronic products such as mobile phones, notebook computers, digital cameras, etc. In recent years, it has expanded to the automotive field.

The structure of the battery cell (Cell) mainly includes positive electrode material, electrolyte, negative electrode material, separator and casing. The separator separates the positive electrode material and the negative electrode material to avoid short circuits, while the electrolyte is placed on the porous separator. In, and work as the conduction of ionic charge. The casing is used to cover the above-mentioned positive electrode material, separator, electrolyte, and negative electrode material. Generally, the casing is usually made of a 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 cell are connected by electric welding. During the electric welding process, the temperature of the battery conductive frame and the battery cell needs to be increased, and the battery conductive frame is applied to the positive/negative case of the battery cell. Press to complete the connection between the battery conductive frame and the battery core. However, during the above process of connecting the battery conductive frame and the battery cell, the shell of the battery cell is often damaged due to excessive pressure and/or high temperature, which may cause damage to the battery cell.

An object of the present invention is to provide a battery conductive frame, including a first conductive portion and a plurality of second conductive portions, wherein the first conductive portion is provided with a plurality of connecting holes, and the second conductive portion is provided on the first conductive portion Inside the connecting hole, a protruding part is formed on the surface of the first conductive part, and the resistance of the second conductive part is greater than the resistance of the first conductive part. Through the application of the battery conductive frame of the present invention, the energy consumed when connecting the battery conductive frame and the battery cell through resistance welding can be reduced, and the damage to the structure of the battery cell during the resistance welding process can be reduced to improve the product. The yield and reliability.

An object of the present invention is to provide a battery conductive frame, which mainly includes a first conductive part and a plurality of second conductive parts, wherein a plurality of through holes are provided on the first conductive part, and an inner spiral is arranged in the through holes, and the second conductive part The surface of the conductive part is provided with an outer spiral. The second conductive part can be fixed to the inner spiral of the perforation of the first conductive part through the outer screw, and the second conductive part is fixed on the first conductive part to improve the convenience of arranging the second conductive part on the first conductive part Sex.

An object of the present invention is to provide a battery conductive frame, wherein the second conductive part is arranged in the connecting hole of the first conductive part, and a protrusion is formed on the surface of the first conductive part, and the resistance of the second conductive part is greater than Resistance of the first conductive part. Due to the poor structural strength of the protruding part protruding from the surface of the first conductive part, when the second conductive part is connected to the battery cell by resistance welding, the second conductive part and the shell of the battery cell will be deformed, which can effectively avoid The structure of the battery cell is damaged during the resistance welding process.

The present invention provides a battery conductive frame, including: a first conductive part, including a plurality of connecting holes; and a plurality of second conductive parts, arranged in the connecting hole of the first conductive part, and part of the second conductive part is located in the connecting hole A protruding part is formed on a surface of the first conductive part. The protruding part is used to connect a battery cell. The first conductive part and the second conductive part are made of different materials, and the second conductive part The resistance is greater than the resistance of the first conductive part.

In the battery conductive frame, the first conductive portion includes a first surface and a second surface, the first surface and the second surface are two opposite surfaces on the first conductive portion, and the connecting hole penetrates the first conductive portion , And communicate with the first surface and the second surface of the first conductive portion, and the second conductive portion extends from the first surface to the second surface of the first conductive portion.

In the battery conductive frame, the second conductive part includes a first end and a second end. The first end protrudes from the first surface of the first conductive part to form a protruding part, and the second end includes a head The cross-sectional area of the head is larger than the cross-sectional area of the connecting hole.

In the battery conductive frame, an outer thread is provided on an outer surface of the second conductive portion, and an inner thread is provided on an inner surface of the connecting hole, and the second conductive portion is locked on the connecting hole through the outer thread and the inner thread .

In the battery conductive frame, the protruding part is a bump, and the cross-sectional area of the bump is larger than the cross-sectional area of the connecting hole.

In the battery conductive frame, the protruding part is connected to the battery core, and a eutectic part is formed between the first conductive part and the battery core.

In the battery conductive frame, the first conductive part includes a plurality of branches, and each branch is respectively connected to a battery core.

In the battery conductive frame, the branches include a plurality of sub-branches, and there is a gap between adjacent sub-branches, the plurality of sub-branches of the same branch are connected to the same battery core, and the plurality of sub-branches are connected to the same battery cell. At least one second electrical part is arranged on each of them.

Please refer to FIG. 1, FIG. 2 and FIG. 3, which are respectively a top view and a schematic cross-sectional view of an embodiment of the battery conductive frame of the present invention. As shown in the figure, the battery conductive frame 10 mainly includes a first conductive portion 11 and a plurality of second conductive portions 13, wherein the first conductive portion 11 includes a plurality of connecting holes 12, and the second conductive portion 13 is disposed on the first conductive portion. In the connecting hole 12 of the conductive portion 11, the first conductive portion 11 and the second conductive portion 13 are made of different materials.

The first conductive portion 11 includes a first surface 111 and a second surface 113, wherein the first surface 111 and the second surface 113 may be two opposite surfaces on the first conductive portion 11, and the connecting hole 12 is provided on the first surface 111 and the second surface 113. The first surface 111 and/or the second surface 113 of a conductive portion 11, for example, the first surface 111 is the lower surface, and the second surface 113 is the upper surface.

The second conductive portion 13 can be inserted into the connecting hole 12, and part of the second conductive portion 13 is located in the connecting hole 12, and part of the second conductive portion 13 is located outside the connecting hole 12 and on the surface of the first conductive portion 11. (For example, the first surface 111) is formed with a protrusion 131. The battery conductive frame 10 can be connected to a battery core 15 through the protruding portion 131, such as a casing 151 connected to the battery core 15, wherein the casing 151 is made of a metal material.

In practical applications, the battery conductive frame 10 and the battery cell 15 can be connected by welding or resistance welding. As shown in FIG. 4, the protrusion 131 on the second surface 113 of the first conductive part 11 can contact the battery cell. 15 and the second conductive portion 13 is supplied with power through a power supply electrode 19, so that the current is transmitted to the housing 151 of the battery cell 15 through the protrusion 131 of the second conductive portion 13, so as to improve the second conductive portion 13 The temperature of the protruding portion 131 and the casing 151 of the battery core 15 in contact with each other, and the eutectic portion 17 is formed between the battery conductive frame 10, the first conductive portion 11 and/or the second conductive portion 13 and the battery core 15.

In the process of resistance welding, the battery conductive frame 10 can also be pressurized in the direction of the battery core 15 through the power supply electrode 19 to facilitate the connection of the battery conductive frame 10 and the battery core 15. Specifically, when current passes through the protrusion 131 of the second conductive portion 13 and the casing 151 of the battery cell 15, the protrusion 131 of the second conductive portion 13 and the casing 151 of the battery cell 15 in contact with each other will be affected by the temperature. Rising and softening, when the temperature of the protrusion 131 of the second conductive portion 13 and the casing 151 of the battery core 15 reaches a certain value, it will melt to form a molten pool. At this time, the softened protruding portion 131 can be squeezed through the first conductive portion 11 through the power supply electrode 19 to facilitate the formation of the eutectic portion 17 between the battery conductive frame 10 and/or the first conductive portion 11 and the battery core 15, and The connection between the battery conductive frame 10 and the battery core 15 is completed.

Generally speaking, the battery conductive frame is usually made of materials with low resistance and high conductivity characteristics to reduce the energy loss caused when the battery cells are charged and discharged through the battery conductive frame. However, when the low-resistance battery conductive frame and the shell of the battery cell are connected by resistance welding, it is necessary to provide a larger current to the battery conductive frame and the shell of the battery cell, and increase the welding of the battery conductive frame and the battery cell. The energy consumed.

In addition, the battery conductive frame usually has a larger thickness to increase the cross-sectional area of the battery conductive frame and reduce the resistance of the battery conductive frame. However, as the thickness of the battery conductive frame increases, the structural strength of the battery conductive frame will be improved, so that the battery conductive frame is less likely to be deformed when it is connected to the shell of the battery core. Therefore, when pressure is applied to the shell of the battery core through the battery conductive frame, the shell of the battery core will be deformed. For example, the protruding welding part on the battery conductive frame will form deeper in the shell of the battery core. Or a wider depression.

As a result, during the process of connecting the battery conductive frame and the battery core, the shell structure of the battery core may be damaged, for example, metal cracks are generated in the shell of the battery core, thereby affecting the reliability and durability of the battery core. However, in order to avoid the above-mentioned problems when welding the battery conductive frame and the battery cell, the battery conductive frame with high resistance and low conductivity is selected, which will increase the energy loss caused by the battery cell charging and discharging through the battery conductive frame.

In order to solve the above-mentioned problems, the present invention proposes to fabricate the battery conductive frame 10 with two different materials, wherein the first conductive portion 11 and the second conductive portion 13 are made of different materials, and the resistance and/or resistance of the second conductive portion 13 The coefficient is greater than that of the first conductive portion 11, that is, the conductivity of the first conductive portion 11 is higher than that of the second conductive portion 13. For example, the first conductive portion 11 may be copper, and the second conductive portion 13 may be nickel.

Since the second conductive portion 13 has a relatively large resistance, when the second conductive portion 13 of the battery conductive frame 10 and the casing 151 of the battery cell 15 that are in contact are connected by resistance welding, the supply to the second conductive portion can be reduced. The current of 13 can be used to connect the second conductive portion 13 and the casing 151 of the battery core 15 by resistance welding, thereby effectively reducing the energy consumed when connecting the battery conductive portion 10 and the battery core 15.

In addition, because the structural strength of the protruding portion 131 of the second conductive portion 13 protruding from the surface of the first conductive portion 11 is poor, when the second conductive portion 13 is connected to the casing 151 of the battery core 15 through resistance welding, the second conductive portion Both the portion 13 and the housing 151 of the battery core 15 will be deformed, which can reduce the degree of deformation of the housing 151 of the battery core 15. For example, the protrusion 131 on the surface of the first conductive portion 11 will deform during resistance welding. It can also reduce the depth and/or area of the deformed portion caused by the protrusion 131 pressing the shell 151 of the battery core 15. In this way, it can avoid damaging the structure of the casing 151 of the battery core 15 during the process of connecting the battery conductive frame 10 and the battery core 15, for example, it can prevent the casing 151 of the battery core 15 from producing metal cracks, so as to improve the durability of the battery core 15 and Reliability.

Since the resistance value of the first conductive portion 11 is low, the resistance value of the battery conductive frame 10 will not be greatly increased due to the arrangement of the second conductive portion 13, which can reduce the charging and discharging of the battery cell 15 through the battery conductive frame 10 The energy loss caused.

In an embodiment of the present invention, as shown in FIG. 1, the first conductive portion 11 has a fishbone-like appearance and has a plurality of branches 115. For example, the first conductive portion 11 may include six branches 115, each of which The branches 115 are respectively connected to a battery cell 15 so that the battery conductive frame 10 is connected in series and/or in parallel with six battery cells 15.

In another embodiment of the present invention, each branch 115 of the first conductive portion 11 may include a plurality of sub-branches 117, and there is a gap 112 between adjacent sub-branches 117. A plurality of secondary branches 117 are used to connect the same battery cell 15. In addition, at least one connecting hole 12 may be provided on each secondary branch 117, and the second conductive portion 13 may be arranged in the connecting hole 12 of each secondary branch 117. For example, the first conductive portion 11 may include six branches 115, wherein each branch 115 includes two secondary branches 117 respectively, and each branch 115 is connected to the same battery cell 15 through the two second conductive portions 13. Specifically, the number of branches 115 and sub-branches 117 on the first conductive portion 11, and the number of second conductive portions 13 and battery cells 15 are not limited by the scope of the present invention.

Each branch 115 of the first conductive portion 11 is provided with two or more sub-branches 117, and each sub-branch 117 is provided with at least one second conductive portion 13. As shown in FIG. 4, the power supply electrode 19 includes a first electrode 191 and a second electrode 193, wherein the first electrode 191 and the second electrode 193 are respectively connected to different sub-branch on a branch 115 of the first conductive portion 11 The second conductive portion 13 of the 117 and the second conductive portion 13 on the connected sub-branch 117 are supplied with current through the first electrode 191.

Since there is a gap between the sub-branch 117, most of the current will be transmitted to the casing 151 of the battery cell 15 by the second conductive portion 13 on the sub-branch 117 connected to the first electrode 191, and then connected to the second The second conductive portion 13 on the secondary branch 117 of the electrode 193 is transmitted back to the second electrode 193, thereby increasing the current flowing through the second conductive portion 13 and the shell 151 of the battery cell 15 in contact, and is beneficial to increase The temperature of the second conductive portion 13 and the case 151 of the battery cell 15 in contact.

In an embodiment of the present invention, the connecting hole 12 can penetrate the first conductive portion 11 and communicate with the first surface 111 and the second surface 113 of the first conductive portion 11, and the second conductive portion 13 disposed in the connecting hole 12 The first surface 111 of the first conductive portion 11 extends to the second surface 113, and the second conductive portion 13 forms a protrusion 131 on the first surface 111 of the first conductive portion 11.

In another embodiment of the present invention, an internal thread may be provided on the inner surface of the connecting hole 12, and the second conductive portion 13 has an appearance similar to a cylinder, and an outer thread is provided on the outer surface of the second conductive portion 13. For example, the connecting hole 12 of the first conductive portion 11 is similar to a screw hole, and the second conductive portion 13 is similar to a screw, so that the second conductive portion 13 can be locked on the connecting hole 12 via internal and external threads.

As shown in FIGS. 2 and 3, the second conductive portion 13 includes a first end 132 and a second end 134. When the second conductive portion 13 is disposed in the connecting hole 12 of the first conductive portion 11, the second conductive portion 13 The first end 132 of the portion 13 will protrude from the first surface 111 of the first conductive portion 11 to form a protruding portion 131. In addition, the second end 134 of the second conductive portion 13 may be provided with a head 135, wherein the cross-sectional area of the head 135 is larger than the cross-sectional area of the connecting hole 12.

In another embodiment of the present invention, as shown in FIG. 5, the appearance of the second conductive portion 23 may be a columnar body with a uniform cross-sectional area, such as a cylinder. In other words, the second conductive portion 23 of this embodiment does not have the head portion 135 of the second conductive portion 13 described in FIG. 2. In addition, the outer surface of the second conductive portion 23 of this embodiment can be provided with an external thread, and the inner surface of the connecting hole 12 can be provided with an internal thread.

In another embodiment of the present invention, as shown in FIG. 6, one end of the second conductive portion 33 is a bump 331, wherein the cross-sectional area of the bump 331 is larger than the cross-sectional area of the connecting hole 12. Specifically, the second conductive portion 33 can be inserted into the connecting hole 12 on the first surface 111 of the first conductive portion 11, wherein the bumps 331 of the second conductive portion 33 are located on the first surface 111 of the first conductive portion 11, As a result, the bump 331 forms a protrusion 131 on the first surface 111 of the first conductive portion 11. The bumps 331 of the second conductive portion 33 are used to connect the casing 151 of the battery core 15 and can increase the area and/or thickness of the eutectic portion 17 between the first conductive portion 11 and the casing 151 of the battery core 15. In order to increase the connection strength between the first conductive portion 11 and the battery core 15.

In addition, the outer surface of the second conductive portion 33 of this embodiment can be provided with an external thread, and the inner surface of the connecting hole 12 can be provided with an internal thread. The second conductive portion 33 can be provided on the first surface 111 of the first conductive portion 11. The connecting hole 12 is locked on the second conductive portion 33 so that the bump 331 is located on the first surface 111 of the first conductive portion 11.

In the embodiment of the present invention, the second conductive portion 13/23/33 completely overlaps the first conductive portion 11 and protrudes from the first surface 111 (the lower surface) of the first conductive portion 11. Therefore, when the battery conductive frame 10 is connected to the casing 151 of the battery core 15 through the second conductive portion 13/23/33, a gap will be formed between the first conductive portion 11 and the connected battery core 15, as shown in FIG. 4. When the battery cell 15 is damaged and the battery fluid gas is ejected, the ejected battery fluid gas can be discharged from the gap G between the first conductive portion 11 and the battery cell 15, and reduce the battery fluid gas and the battery conductive frame 10 and/or The time or opportunity for other battery cells 15 to contact to reduce damage to other battery cells 15.

In an embodiment of the present invention, the battery core 15 may include a positive electrode 152 and a negative electrode 154, and the positive electrode 152 and the negative electrode 154 of the battery core 25 are separated by an insulating ring 155. Specifically, the positive electrode 152 of the battery core 15 is located inside the insulating ring 155, and the negative electrode 154 is located outside the insulating ring 155.

Generally speaking, when the battery core 15 fails, the battery liquid gas inside the battery core 15 is usually sprayed out of the battery core 15 from the insulating ring 155 at the junction of the positive electrode 152 and the negative electrode 154. In the embodiment of the present invention, because the second conductive portion 13 is only connected to the positive electrode 152 inside the insulating ring 155, there is a gap between the first conductive portion 11 and the insulating ring 155 of the battery core 15 and the casing 151 so that The battery liquid gas ejected from the battery cell 15 can be transmitted to the outside through the gap G.

The above is only one of the preferred embodiments of the present invention, and is not used to limit the scope of implementation of the present invention. That is to say, all the shapes, structures, features and spirits described in the scope of the patent application of the present invention are equally changed and changed. All modifications shall be included in the scope of the patent application of the present invention.

10: Battery conductive frame 11: The first conductive part 111: first surface 112: gap 113: second surface 115: branch 117: Sub-branch 12: connecting hole 13: The second conductive part 131: Protruding part 132: first end 134: second end 135: Head 15: battery cell 151: Shell 152: Positive 154: Negative 155: Insulation ring 17: Eutectic part 19: Power supply electrode 191: first electrode 193: second electrode 23: The second conductive part 33: second conductive part 331: bump

Figure 1 is a top view of an embodiment of the battery conductive frame of the present invention.

Figure 2 is a schematic cross-sectional view of an embodiment of the battery conductive frame of the present invention.

Fig. 3 is a schematic cross-sectional view of an embodiment of the battery conductive frame of the present invention.

Figure 4 is a schematic cross-sectional view of an embodiment of the battery conductive frame of the present invention.

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

Fig. 6 is a schematic cross-sectional view of another embodiment of the battery conductive frame of the present invention.

11: The first conductive part

111: first surface

112: gap

113: second surface

12: connecting hole

13: The second conductive part

131: Protruding part

132: first end

134: second end

135: Head

15: battery cell

151: Shell

Claims (4)

A battery conductive frame includes: a first conductive part including a plurality of connecting holes; and a plurality of second conductive parts arranged in the connecting hole of the first conductive part, and a part of the second conductive part is located in the connecting hole A protrusion is formed on a surface of the first conductive part outside the hole, and the protrusion is used to connect a battery cell, wherein the first conductive part and the second conductive part are made of different materials, and The resistance of the second conductive portion is greater than the resistance of the first conductive portion; wherein the first conductive portion includes a first surface and a second surface, and the first surface and the second surface are opposite to each other on the first conductive portion The connecting hole penetrates through the first conductive portion and communicates with the first surface and the second surface of the first conductive portion, and the second conductive portion is formed by the first conductive portion of the first conductive portion. The surface extends to the second surface; wherein the protruding portion is a bump, and the cross-sectional area of the bump is larger than the cross-sectional area of the connecting hole. The battery conductive frame according to claim 1, wherein the protruding portion is connected to the battery core, and a eutectic portion is formed between the first conductive portion and the battery core. The battery conductive frame according to claim 1, wherein the first conductive portion includes a plurality of branches, and each branch is connected to a battery core. The battery conductive frame according to claim 3, wherein the branch includes a plurality of sub-branches, and there is a gap between the adjacent sub-branches, and the plurality of branches is the same Each of the sub-branches is connected to the same battery core, and at least one second conductive part is provided on the plurality of sub-branches.

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