CN211088377U

CN211088377U - Battery conductive frame

Info

Publication number: CN211088377U
Application number: CN201922149713.5U
Authority: CN
Inventors: 张古博
Original assignee: STL Technology Co Ltd
Current assignee: STL Technology Co Ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-07-24
Anticipated expiration: 2029-12-04

Abstract

The utility model provides a battery conducting frame for connect a plurality of battery cores, wherein the battery conducting frame includes a first conductive part and a plurality of second conductive part, and the upper surface of each second conductive part connects first conductive part through an eutectic portion respectively. The lower surface of each second conductive part is provided with at least one protruding welding part, and the second conductive parts are connected with a shell of a battery cell through the protruding welding parts. The first conductive part and the second conductive part are made of different materials, wherein the resistance of the second conductive part is larger than that of the first conductive part. Because the second conductive part has a larger resistance value, when the battery conductive frame and the battery core are connected in an electric welding mode, a smaller current can be used, so that the energy consumed in the electric welding process can be reduced, and the battery core can be prevented from being damaged in the electric welding process.

Description

Battery conductive frame

Technical Field

The utility model provides a battery conducting frame for connect the battery core and can avoid causing the harm to the battery core at the in-process of connecting the battery core.

Background

The secondary battery mainly comprises a nickel-hydrogen battery, a nickel-cadmium battery, a lithium ion battery and a lithium polymer battery. The lithium battery has the advantages of high energy density, high operating voltage, wide use temperature range, no memory effect, long service life, capability of being charged and discharged for many times and the like, is widely used in portable electronic products such as mobile phones, notebook computers, digital cameras and the like, and expands the field of automobiles in recent years.

The Cell structure mainly includes a positive electrode material, an electrolyte, a negative electrode material, an isolation layer and a case, wherein the isolation layer separates the positive electrode material from the negative electrode material to prevent short circuit. The electrolyte is disposed in the porous separator and operates as a conduction of ionic charges. The shell is used for coating the anode material, the isolating film, the electrolyte and the cathode material. Generally, the housing is made of metal.

When the battery pack is used, a plurality of battery cells are connected in series and/or in parallel through the battery conducting frame to form the battery pack, so that the battery pack can output the voltage required by a product. Generally speaking, a battery conductive frame and a battery core are connected by electric welding, during the electric welding process, the temperature of the battery conductive frame and the battery core needs to be increased, and the battery conductive frame is pressed to a positive electrode shell and/or a negative electrode shell of the battery core to complete the connection between the battery conductive frame and the battery core. However, in the process of connecting the battery conductive frame and the battery cell, the casing of the battery cell is often damaged due to excessive pressure and/or excessive temperature, which may result in damage to the battery cell.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery conducting rack, including a first conductive part and a plurality of second conductive part, wherein second conductive part is connected through eutectic portion to first conductive part. The first conductive part and the second conductive part are made of different metal materials respectively, wherein the resistance of the second conductive part is larger than that of the first conductive part. Through electrically conductive application of frame of battery, reducible energy that consumes when connecting electrically conductive frame of battery and battery core through electric welding mode more can reduce the harm that causes the structure of battery core at electric welding in-process to the yield and the reliability of improvement product.

An object of the present invention is to provide a battery conductive frame, which mainly comprises a first conductive part and a plurality of second conductive parts, wherein the second conductive part is completely overlapped with the first conductive part, and a protrusion is formed on the surface of the first conductive part. The battery conducting frame is connected with the battery core through the second conducting part, wherein a gap is formed between the first conducting part and the battery core, so that battery liquid gas sprayed out of a failed battery core can be discharged from the gap, and the possibility of contact between the battery liquid gas and the battery conducting frame or other battery cores and possible damage to the battery liquid gas are reduced.

An object of the present invention is to provide a battery conductive frame for connecting a plurality of battery cores in series and/or in parallel, wherein the battery core includes a positive electrode, a negative electrode and an insulating ring, and the insulating ring is used for isolating the positive electrode and the negative electrode of the battery core. The battery conductive frame can be connected with the positive electrode of the battery core through a second conductive part, wherein the sectional area of the second conductive part is smaller than that of a surrounding area formed by the positive electrode or the insulating ring.

The utility model provides a battery leads electrical frame, include: a first conductive portion; a plurality of second conductive parts including a first surface and a second surface, wherein the first surface of the second conductive part is connected with the first conductive part through a eutectic part; and at least one protruding welding part arranged on the second surface of the second conductive part and used for connecting a battery core, wherein the first conductive part and the second conductive part are made of different materials, and the resistance of the second conductive part is greater than that of the first conductive part.

The battery conductive frame is characterized in that the second conductive part comprises at least one concave part which is positioned on the first surface of the second conductive part, and the position of the concave part corresponds to the protruding welding part.

The battery conducting frame is characterized in that the second conducting part is partially overlapped with the first conducting part.

The battery conducting frame is characterized in that the protruding welding part on the second conducting part is not overlapped with the first conducting part.

In the battery conducting frame, the second conducting part is completely overlapped with the first conducting part, and a bulge is formed on one surface of the first conducting part, so that a gap is formed between the first conducting part and the connected battery core.

The battery conducting frame comprises an insulating ring for isolating a positive electrode and a negative electrode of a battery core, wherein the insulating ring is provided with a surrounding area, the positive electrode of the battery core is positioned in the surrounding area, and the sectional area of the second conducting part is smaller than or equal to that of the surrounding area of the insulating ring or the positive electrode.

The battery conducting frame is characterized in that the second conducting part comprises at least one concave part which is positioned on the first surface of the second conducting part, the concave part corresponds to the protruding welding part, and the eutectic part is connected with the first surface of the second conducting part and the concave part.

The battery conducting frame is characterized in that the first conducting part comprises a plurality of branches which are respectively connected with the second conducting parts.

The battery conducting frame is characterized in that the first conducting part comprises a plurality of branches which are respectively connected with a plurality of secondary branches and connected with a second conducting part through the secondary branches.

Drawings

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

Fig. 2 is a partial side view of an embodiment of the battery conductive frame and the battery cell of the present invention.

Fig. 3 is a side connection diagram of an embodiment of the battery conductive frame and the battery core according to the present invention.

Fig. 4 is a top view of another embodiment of the battery conductive frame of the present invention.

Fig. 5 is a top view of another embodiment of the battery conductive frame of the present invention.

Fig. 6 is a partial enlarged view of another embodiment of the battery conductive frame and the battery cell according to the present invention.

FIG. 7 is a side connection diagram of an embodiment of the battery conductive frame and the battery core of the present invention

Fig. 8 is a top view of another embodiment of the battery conductive frame of the present invention.

Description of the main component symbols:

10 battery conducting rack

11 first conductive part

111 branch of

113 times of branching

12 eutectic part

13 second conductive part

131 first surface

133 second surface

151 projection welding part

153 concave part

17 cell core

171 casing

173 deformation part

20 battery conducting rack

21 first conductive part

211 branch of

213 times branching

22 eutectic part

23 second conductive part

231 first surface

233 second surface

24 surrounding area

251 projecting welding part

253 recess

27 cell core

271 casing

272 positive electrode

273 deformed part

274 negative electrode

275 insulating ring

A1 cross sectional area

A2 cross sectional area

A3 cross sectional area

G gap

Detailed Description

Please refer to fig. 1 and fig. 2, which are a top view and a side view of an embodiment of a battery conductive frame according to the present invention. As shown in the figure, the battery conductive frame 10 mainly includes a first conductive portion 11, at least one second conductive portion 13, and at least one protruding solder portion 151, wherein the first conductive portion 11 and the second conductive portion 13 are made of different materials, and are connected to the first conductive portion 11 and the second conductive portion 13 through a eutectic portion 12.

The second conductive portion 13 includes a first surface 131 and a second surface 133, for example, the first surface 131 and the second surface 133 may be two opposite surfaces of the second conductive portion 13, wherein a portion of the first surface 131 of the second conductive portion 13 is connected to the first conductive portion 11 through the eutectic portion 12 to form a main body structure of the battery conductive frame 10, for example, the first conductive portion 11 and the second conductive portion 13 may be connected by welding (welding).

In an embodiment of the present invention, the first surface 131 of the second conductive part 13 may be provided with at least one protruding solder portion 155, wherein the protruding solder portion 155 may be a bump protruding from the first surface 131 of the second conductive part 13, and the second conductive part 13 may be connected to the first conductive part 11 via the protruding solder portion 155. In practical applications, the first conductive part 11 and the second conductive part 13 may be connected by resistance welding, for example, the protruding solder portion 155 on the first surface 131 of the second conductive part 13 may be contacted with the lower surface of the first conductive part 11, and power may be supplied to the second conductive part 13 through the first conductive part 11, so as to increase the temperature of the protruding solder portion 155 of the second conductive part 13 and the contacted first conductive part 11, and form the eutectic portion 12 between the first conductive part 11 and the second conductive part 13.

Furthermore, the second surface 133 of the second conductive part 13 is provided with at least one protruding solder 151, wherein the protruding solder 151 may be a bump protruding from the second surface 133 of the second conductive part 13, and the second conductive part 13 may be connected to the housing 171 of the battery cell 17 via the protruding solder 151, such as to the positive electrode or the negative electrode of the housing.

In an embodiment of the present invention, the protruding solder portions 155/151 are formed on the first surface 131 and the second surface 133 of the second conductive portion 13 respectively by stamping, and the second surface 133 and the first surface 131 of the second conductive portion 13 form at least one concave portion 157/153, wherein the position of the concave portion 157/153 corresponds to the position of the protruding solder portion 155/151.

Of course, the second conductive portion 13 is manufactured by stamping and forming only an embodiment of the present invention, not a limitation of the scope of the invention, and therefore, the at least one concave portion 153/157 on the first surface 131 and the second surface 133 of the second conductive portion 13 is not a limitation of the invention. In practical applications, the second conductive part 13 may be manufactured in other manners, such as manufacturing the second conductive part 13 by casting, so that the first surface 131 and the second surface 133 of the second conductive part 13 have no recessed portion 153/157.

In an embodiment of the present invention, the second conductive part 13 and the first conductive part 11 are partially overlapped, wherein the protruding solder 151 and/or the concave part 153 of the second conductive part 13 do not overlap with the first conductive part 11. Specifically, the projection solder 151 and/or the concave portion 153 may be provided in a region of the second conductive portion 13 that does not overlap with the first conductive portion 11, so that the eutectic portion 12 connecting the first conductive portion 11 and the second conductive portion 13 does not contact the concave portion 153 of the second conductive portion 13.

In practical applications, the second conductive part 13, the projection welding part 151 and the case 171 of the battery cell 17 are connected mainly by welding, which is a process technique for joining dissimilar metals by heating or pressing.

In an embodiment of the present invention, the second conductive part 13, the protruding welding part 151 and the casing 171 of the battery cell 17 can be connected by resistance welding, and the protruding welding part 151 on the second conductive part 13 is first contacted with the battery cell 17, for example, contacted with the casing 171 of the positive electrode or the negative electrode of the battery cell 17, wherein the casing 171 is made of metal.

Since second conductive portion 13, projection welding portion 151, and case 171 of battery cell 17 are made of metal and have resistance, when current passes through second conductive portion 13, projection welding portion 151, and case 171 of battery cell 17, the temperature of projection welding portion 151 and case 171 of battery cell 17 in contact therewith increases.

When the temperature of second conductive portion 13, projection weld 151, and case 171 of cell 17 reaches a certain value, it will melt to form a molten pool. Then, the case 171 of the battery cell 17 is pressed by the second conductive part 13 and the projection welding part 151, so that the projection welding part 151 on the second conductive part 13 sinks into the case 171 of the battery cell 17. After the temperature of second conductive part 13, projection welding part 151 and case 171 of battery cell 17 is lowered, the connection between second conductive part 13 and battery cell 17 is completed.

Generally, the battery frame is made of a material with low resistance and high conductivity to reduce energy loss caused by charging and discharging the battery core through the battery frame. When the low-resistance battery conducting frame and the shell of the battery core are connected in a resistance welding mode, large current must be supplied to the battery conducting frame and the shell of the battery core, and energy consumed by welding the battery conducting frame and the battery core is increased.

In addition, the battery frame usually has a larger thickness to increase the sectional area of the battery frame and reduce the resistance of the battery frame. However, as the thickness of the battery conductive frame is increased, the structural strength of the battery conductive frame is improved, so that the battery conductive frame is less prone to deformation when the battery conductive frame is connected with the shell of the battery core. Therefore, when pressure is applied to the shell of the battery cell through the battery conductive frame, the shell of the battery cell is greatly deformed, for example, the protruding welding parts on the battery conductive frame form deeper or wider depressions on the shell of the battery cell.

Therefore, in the process of connecting the battery conductive frame and the battery core, the casing structure of the battery core may be damaged, for example, metal cracks may be generated in the casing of the battery core, thereby affecting the reliability and durability of the battery core. However, if a battery lead frame with high resistance and low conductivity is selected to avoid the above-mentioned problems occurring when welding the battery lead frame and the battery cell, energy loss caused when the battery cell is charged and discharged through the battery lead frame is increased.

In order to solve the above problem, the present invention provides a battery frame 10 made of two different materials, wherein the first conductive part 11 and the second conductive part 13 are made of different materials, and the resistance and/or the resistivity of the second conductive part 13 is greater than that of the first conductive part 11, i.e. the conductivity of the first conductive part 11 is higher than that of the second conductive part 13. For example, first conductive portion 11 may be copper and second conductive portion 13 may be nickel.

Since the second conductive part 13 has a large resistance, when the second conductive part 13 of the battery holder 10 and the case 171 of the battery cell 17 in contact are connected by resistance welding, the current supplied to the second conductive part 13 can be reduced, and the second conductive part 13 and the case 171 of the battery cell 17 can be connected by resistance welding, whereby the energy consumed in connecting the battery conductive part 10 and the battery cell 17 can be effectively reduced.

In addition, the thickness of the second conductive portion 13 can be further reduced to reduce the structural strength of the second conductive portion 13, for example, the thickness or the cross-sectional area of the second conductive portion 13 is smaller than that of the first conductive portion 11. When second conductive portion 13 and case 171 of battery cell 17 are joined by resistance welding, second conductive portion 13 and case 171 of battery cell 17 are deformed, and the degree of deformation of case 171 of battery cell 17 can be reduced, for example, projection welding portion 151 of second conductive portion 13 is deformed during resistance welding, and the depth and/or area of deformation portion 173 generated by pressing projection welding portion 151 against case 171 of battery cell 17 can be reduced, as shown in fig. 3. Therefore, the damage to the structure of the case 171 of the battery cell 17 can be avoided in the process of connecting the battery conductive frame 10 and the battery cell 17, for example, the metal crack of the case 171 of the battery cell 17 can be prevented, and the durability and reliability of the battery cell 17 can be improved.

In addition, since the resistance of the first conductive part 11 is low, the resistance of the battery frame 10 is not greatly increased by the second conductive part 13, and the energy loss caused by charging and discharging the battery core 17 through the battery frame 10 can be reduced.

In the embodiment of fig. 1, the first conductive part 11 is similar to a fishbone in appearance and has a plurality of branches 111, wherein each branch 111 of the first conductive part 11 is connected to a second conductive part 13 through the eutectic part 12, for example, the first conductive part 11 may include six branches 111, and six second conductive parts 13 are connected to six branches 111, wherein the six second conductive parts 13 are connected to a battery core 17, respectively, so that the battery conductive frames 10 are connected in series and/or in parallel with six battery cores 17.

In another embodiment of the present invention, as shown in fig. 4, each branch 111 of the first conductive part 11 may be respectively provided with a plurality of sub-branches 113, wherein each sub-branch 113 is respectively connected to a second conductive part 13, so that each branch 111 of the first conductive part 11 is respectively connected to a plurality of second conductive parts 13. For example, the first conductive part 11 may include six branches 111, wherein each branch 111 connects two sub-branches 113, and each sub-branch 113 connects a second conductive part 13, so that each branch 111 connects a battery cell 17 through two second conductive parts 13.

Specifically, the number of branches 111 and sub-branches 113 on first conductive part 11, and the number of second conductive parts 13 and battery cells 17 connected to first conductive part 11 are not limited by the scope of the present invention.

Please refer to fig. 5 and fig. 6, which are a top view and a side view of another embodiment of the battery conductive frame of the present invention. As shown in the figure, the battery conductive frame 20 mainly includes a first conductive portion 21, at least one second conductive portion 23, and at least one protruding solder portion 251, wherein the first conductive portion 21 and the second conductive portion 23 are made of different materials and are connected through a eutectic portion 22.

Specifically, the second conductive portion 23 includes a first surface 231 and a second surface 233, wherein the first surface 231 of the second conductive portion 23 is connected to the first conductive portion 21 through the eutectic portion 22 to form the main structure of the battery frame 20.

In an embodiment of the present invention, at least one protruding solder portion 255 may be disposed on the first surface 231 of the second conductive portion 23, wherein the protruding solder portion 255 may be a protruding point protruding from the first surface 231 of the second conductive portion 23, and the second conductive portion 23 may be connected to the first conductive portion 21 via the protruding solder portion 255. In practical applications, the first conductive part 21 and the second conductive part 23 may be connected by resistance welding, for example, the protruding solder 255 on the first surface 231 of the second conductive part 23 may be contacted with the lower surface of the first conductive part 21, and power may be supplied to the second conductive part 23 through the first conductive part 21, so as to increase the temperature of the protruding solder 255 of the second conductive part 23 and the contacted first conductive part 21, and form the eutectic part 22 between the first conductive part 21 and the second conductive part 23.

In the embodiment of the present invention, as shown in fig. 6, the cross-sectional area a2 of the second conductive portion 23 is smaller than the cross-sectional area a1 of the first conductive portion 21, wherein the second conductive portion 23 completely overlaps the first conductive portion 21, and a protrusion is formed on the surface of the first conductive portion 21, for example, the first conductive portion 21 completely overlaps the first surface 231 and/or the second surface 233 of the second conductive portion 23. After the second conductive portion 23 is connected to the first conductive portion 21 through the eutectic portion 22, the second conductive portion 23 forms a convex conductive portion on a surface (e.g., a lower surface) of the first conductive portion 21.

The second surface 233 of the second conductive portion 23 is provided with at least one protruding solder portion 251, wherein the protruding solder portion 251 can be a bump protruding from the second surface 233 of the second conductive portion 213, and the first surface 231 of the second conductive portion 23 can be provided with at least one recess 253, wherein the position of the recess 253 corresponds to the position of the protruding solder portion 251. In various embodiments, the recess 253 may not be present on the first surface 231 of the second conductive portion 23.

Since the second conductive portion 23 completely overlaps the first conductive portion 21, the protruding solder portion 251 and/or the recessed portion 253 on the second conductive portion 23 also overlap the first conductive portion 21. When the first surface 231 of the second conductive portion 23 has the recess 253, the eutectic portion 22 connecting the first conductive portion 21 and the second conductive portion 23 may be located only on the first surface 231 of the second conductive portion 23, wherein the eutectic portion 22 is not disposed in the recess 253. In various embodiments, the eutectic portion 22 is disposed in both the first surface 231 and the recess 253 of the second conductive portion 23.

In an embodiment of the present invention, the second conductive part 23, the protruding welding part 251 and the housing 271 of the battery cell 27 can be connected by resistance welding to complete the connection between the second conductive part 23 and the battery cell 27. The embodiment of the present invention uses two different materials to manufacture the battery conductive frame 20, wherein the resistance and/or the resistivity of the second conductive portion 23 is greater than that of the first conductive portion 21, i.e. the conductivity of the first conductive portion 21 is higher than that of the second conductive portion 23. For example, the first conductive portion 21 may be copper and the second conductive portion 23 may be nickel.

Therefore, when the battery frame 20 and the case 271 of the battery cell 27 are connected by resistance welding, the current supplied from the first conductive part 21 to the second conductive part 23 and the case 271 of the battery cell 27 can be reduced, and the energy consumed for connecting the battery conductive part 20 and the battery cell 27 can be effectively reduced.

In addition, the thickness of the second conductive portion 23 can be reduced to reduce the structural strength of the second conductive portion 23, so that the projection welding portion 251 on the second conductive portion 23 is also deformed during the resistance welding process, and the depth and/or area of the deformation portion 273 generated by pressing the projection welding portion 251 on the case 271 of the battery cell 27 can be reduced, as shown in fig. 7, to avoid damaging the case structure of the battery cell 27 during connection.

In the embodiment of the present invention shown in fig. 5, the first conductive part 21 has a fishbone-like appearance, has a plurality of branches 211, and is connected to a second conductive part 23 via eutectic portions 22 on each branch 211 of the first conductive part 21, wherein each second conductive part 23 completely overlaps with the branch 211 of the connected first conductive part 21.

In another embodiment of the present invention, as shown in fig. 8, each branch 211 of the first conductive part 21 can be connected to a plurality of sub-branches 213, wherein each sub-branch 213 is connected to a second conductive part 23, so that each branch 211 of the first conductive part 21 is connected to a plurality of second conductive parts 23, and connected to a battery 27 through a plurality of second conductive parts 23.

Specifically, the number of branches 211 and sub-branches 213 on the first conductive part 21, and the number of second conductive parts 23 and battery cores 27 connected to the first conductive part 21 are not limited by the scope of the present invention.

Since the second conductive portion 23 completely overlaps the first conductive portion 21 and protrudes from the surface (such as the lower surface) of the first conductive portion 21, when the battery frame 20 is connected to the case 271 of the battery cell 27 through the second conductive portion 23, a gap G is formed between the first conductive portion 21 and the connected battery cell 27, as shown in fig. 7. When the battery cell 27 is damaged to cause the gas of the battery liquid to be ejected, the ejected gas of the battery liquid can be discharged from the gap G between the first conductive part 21 and the battery cell 27, and the time or the chance of the battery liquid gas contacting the battery conductive frame 20 and/or other battery cells 27 is reduced, so as to reduce the damage to other battery cells 27.

In one embodiment of the present invention, the battery cell 27 may include a positive electrode 272 and a negative electrode 274, and the positive electrode 272 and the negative electrode 274 of the battery cell 27 are separated by an insulating ring 275. Specifically, the insulating ring 275 can form a surrounding region 24, wherein the positive electrode 272 of the battery cell 27 is located within the surrounding region 24 of the insulating ring 275, the area of the positive electrode 272 is less than or equal to the area of the surrounding region 24, and the negative electrode 274 is located outside the insulating ring 275.

In an embodiment of the present invention, the sectional area a2 of the second conductive portion 23 is smaller than or equal to the sectional area A3 of the surrounding area 24 inside the insulating ring 275, i.e., the sectional area a2 of the second conductive portion 23 is smaller than or equal to the sectional area of the positive electrode 272 of the battery cell 27. When the battery frame 20 is connected to the positive electrode of the battery cell 27, only the second conductive portion 23 will contact the positive electrode located in the insulating ring 275.

Generally, when the battery 27 fails, the battery fluid gas inside the battery 27 is generally ejected out of the battery 27 from the insulating ring 275 where the positive electrode 272 and the negative electrode 274 border. In the embodiment of the present invention, since the second conductive part 23 is only connected to the positive electrode 272 inside the insulating ring 275, there is a gap G between the first conductive part 21 and the insulating ring 275 and the housing 271 of the battery cell 27, so that the battery liquid gas sprayed from the battery cell 27 can be transmitted to the outside through the gap G.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, which is to be construed as broadly as the appended claims in all respects, all of which are intended to cover all such changes and modifications as fall within the true spirit and scope of the invention.

Claims

1. A battery conductive frame, comprising:

a first conductive portion;

a plurality of second conductive parts including a first surface and a second surface, wherein the first surface of the second conductive part is connected to the first conductive part through a eutectic part;

at least one protruding welding part arranged on the second surface of the second conductive part and used for connecting a battery core, wherein the first conductive part and the second conductive part are made of different materials, and the resistance of the second conductive part is greater than that of the first conductive part.

2. The battery holder as claimed in claim 1, wherein the second conductive portion includes at least one recess formed on the first surface of the second conductive portion, the recess corresponding to the protruding solder portion.

3. The battery holder as set forth in claim 1, wherein the second conductive portion partially overlaps the first conductive portion.

4. The battery holder as set forth in claim 3, wherein the projection solder on the second conductive portion does not overlap the first conductive portion.

5. The battery holder as claimed in claim 1, wherein the second conductive part completely overlaps the first conductive part and forms a protrusion on a surface of the first conductive part such that a gap is formed between the first conductive part and the battery cell connected thereto.

6. The battery holder as claimed in claim 5, comprising an insulating ring for separating a positive electrode and a negative electrode of the battery cell, wherein the insulating ring has a surrounding region, the positive electrode of the battery cell is located in the surrounding region, and the cross-sectional area of the second conductive part is smaller than or equal to the cross-sectional area of the surrounding region or the positive electrode of the insulating ring.

7. The battery holder as claimed in claim 5, wherein the second conductive portion includes at least one recess on the first surface of the second conductive portion, the recess corresponding to the protruding solder portion, and the eutectic portion connecting the first surface of the second conductive portion and the recess.

8. The battery holder as claimed in claim 1, wherein the first conductive portion includes a plurality of branches connecting the second conductive portions, respectively.

9. The battery conducting frame as claimed in claim 1, wherein the first conducting portion includes a plurality of branches respectively connected to a plurality of sub-branches, and the sub-branches are connected to the second conducting portion.

10. The battery holder of claim 1, wherein the thickness or cross-sectional area of the second conductive portion is less than the thickness or cross-sectional area of the first conductive portion.