Battery conducting rack

Abstract

The present application relates to a battery conducting frame, comprising a conducting sheet, a plurality of first protruding welding parts and a fixing unit. The first protruding welding parts are arranged on a first surface of the conducting sheet, and the conducting sheet is connected to a battery core through the first protruding welding parts. The fixing unit comprises a 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 a second surface of the conducting sheet, so as to improve the connection strength between the conducting sheet and the battery core, and avoid separation of the conducting sheet and the battery core.

Description

TECHNICAL FIELD

[0001] The present application relates to a battery conductive frame for connecting battery cells, which can improve the connection strength between the battery conductive frame and the battery cells and avoid the separation of the battery conductive frame and the battery cells. BACKGROUND

[0002] Secondary batteries mainly include nickel-hydrogen batteries, nickel-cadmium batteries, lithium-ion batteries, and lithium polymer batteries. Lithium batteries have the advantages of high energy density, high operating voltage, wide temperature range, no memory effect, long service life, and multiple charging and discharging, and are widely used in portable electronic products such as mobile phones, notebook computers, digital cameras, etc. In recent years, they have also been extended to the automotive field.

[0003] The structure of a battery cell mainly includes a positive material, an electrolyte, a negative material, a separator, and a shell. The separator separates the positive material and the negative material to avoid short circuiting, and the electrolyte is disposed in the porous separator and serves as the ion charge conduction work. The shell is used to cover the positive material, the separator, the electrolyte, and the negative material. Generally, the shell is usually made of metal material.

[0004] In use, multiple battery cells are connected in series and / or parallel through a battery conductive frame to form a battery pack, so that the battery pack can output the required voltage of the product. Generally, the battery conductive frame and the battery cell are connected by welding. In the welding process, the temperature of the battery conductive frame and the battery cell needs to be increased, and the battery conductive frame is pressed against the positive / negative shell of the battery cell to complete the connection of the battery conductive frame and the battery cell. However, during welding or use of the battery pack, the battery conductive frame and the battery cell may be loosened due to external force, thereby causing the battery pack to be unable to function normally. SUMMARY

[0005] An object of the present application is to provide a battery conductive frame, which mainly includes a conductive sheet and a fixing unit. The conductive sheet is welded to the battery cell by at least one first protruding welding part and is used to connect multiple battery cells in series or in parallel. The fixing unit is also connected to the battery cell by welding and contacts and compresses part or all of the conductive sheet to strengthen the connection between the conductive sheet and the battery cell. Through the arrangement of the battery conductive frame, the loosening of the battery conductive frame and the battery cell due to external force during the manufacture or use of the battery pack can be effectively prevented, and the reliability of the product can be effectively improved.

[0006] To achieve the above object, the present application provides a battery conducting frame, comprising: a conducting sheet, comprising a first surface and a second surface, wherein the first surface and the second surface are two surfaces facing each other; a plurality of first protruding welding parts, arranged on the first surface of the conducting sheet, and used to connect a plurality of battery cores; and a fixing unit, comprising a fixing part and at least one pressing part, wherein the fixing part is used to connect the battery core, and the pressing part is used to press the conducting sheet.

[0007] Preferably, the pressing part of the fixing unit overlaps the first protruding welding part of the conducting sheet.

[0008] Further, the battery conducting frame further comprises at least one second protruding welding part arranged on the pressing part of the fixing unit, and the pressing part of the fixing unit connects the second surface of the conducting sheet through the second protruding welding part.

[0009] Further, the battery conducting frame further comprises at least one third protruding welding part arranged on the fixing part of the fixing unit, and the fixing part of the fixing unit connects the battery core through the third protruding welding part.

[0010] Preferably, the fixing unit comprises two fixing parts, respectively connecting different battery cores.

[0011] Preferably, the fixing unit is a plurality of fixing units, respectively connecting a plurality of battery cores.

[0012] Preferably, the fixing unit comprises two pressing parts, and connects the same battery core through the two pressing parts.

[0013] In at least one embodiment of the present application, the conducting sheet comprises a plurality of branches, and the first protruding welding part is arranged on the branch.

[0014] Preferably, the conductivity of the fixing unit is less than the conductivity of the conducting sheet.

[0015] Preferably, the thickness of the fixing unit is less than the thickness of the conducting sheet. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a cross-sectional view of an embodiment of the battery conducting frame and the battery core of the present application.

[0017] Figure 2 is a top perspective view of the battery conducting frame and the battery core of the above embodiment of the present application.

[0018] Figure 3 is a cross-sectional view of another embodiment of the battery conducting frame and the battery core of the present application.

[0019] Figure 4 is a top perspective view of the battery conducting frame and the battery core of the above embodiment of the present application.

[0020] Figure 5It is a cross-sectional schematic diagram of another embodiment of the battery conductive frame and battery core of the present invention.

[0021] Figure 6 1 is a top perspective view of the battery conductive frame and the battery core according to the above embodiment of the present invention.

[0022] Explanation of the reference numerals: 10 - battery conductive frame; 11 - conductive sheet; 111 - first surface; 112 - spacer; 113 - second surface; 115 -; first protruding weld portion; 117 - branch; 12 - battery core; 121 - shell; 13 - fixing unit; 131 - fixing portion; 132 - connecting portion; 133 - pressing portion; 135 - second protruding weld portion; 137 - third protruding weld portion. DETAILED DESCRIPTION

[0023] See also Figure 1 and Figure 2 , respectively, are cross-sectional schematic and top perspective views of an embodiment of a battery conductive frame and battery cell according to the present invention. The battery conductive frame 10 is used to connect multiple battery cells 12 and includes a conductive sheet 11 and at least one fixing unit 13. The conductive sheet 11 is used to connect multiple battery cells 12 in series or in parallel.

[0024] 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 charging and discharging of the battery cell 12 through the conductive sheet 11 .

[0025] In practice, the conductive sheet 11 and the battery cell 12 housing 121 are typically connected by welding, such as resistance welding. Welding is a process that joins dissimilar metals by applying heat or pressure. High conductivity of the conductive sheet 11 may hinder resistance welding of the conductive sheet 11 and the battery cell 12.

[0026] 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 opposing surfaces of the conductive sheet 11. For example, the first surface 111 is the bottom surface, and the second surface 113 is the top surface. A plurality of first protruding solder joints 115 are disposed on the first surface 111 of the conductive sheet 11. The first protruding solder joints 115 may be bumps protruding from the first surface 111 of the conductive sheet 11 and are used to connect to the battery cells 12.

[0027] In one embodiment of the present invention, the first protruding portion 115 may be formed on the first surface 111 of the conductive sheet 11 by stamping, and at least one recess may be formed on the second surface 113 of the conductive sheet 11 , wherein the position of the recess corresponds to the position of the first protruding portion 115 .

[0028] Of course, forming the first protruding weld portion 15 on the conductive sheet 11 by stamping is merely one embodiment of the present invention and is not intended to limit the scope of the present invention. In actual applications, the conductive sheet 11 may be manufactured by other methods, such as casting the conductive sheet 11 and the first protruding weld portion 115, in which case the second surface 113 of the conductive sheet 11 will not have a recessed portion.

[0029] During the welding process, the first protruding portion 115 of the conductive sheet 11 is first connected to the housing 121 of the battery cell 12, where the housing 121 is made of metal, for example, the positive or negative terminal of the housing 121. A welding current is then transmitted to the conductive sheet 11, the first protruding portion 115, and the housing 121 of the battery cell 12, causing the temperatures of the first protruding portion 115 of the conductive sheet 11 and the housing 121 to rise.

[0030] When the temperature of the conductive sheet 11, first protruding weld 115, and battery cell 12 casing 121 reaches a specific value, they melt to form a molten pool. Pressure is then applied to the battery cell 12 casing 121 by the conductive sheet 11 and first protruding weld 115, causing the first protruding weld 115 to sink into the battery cell 12 casing 121. Once the temperatures of the conductive sheet 11, first protruding weld 115, and battery cell 12 casing 121 drop, the connection between the conductive sheet 11 and battery cell 12 is complete.

[0031] Although the conductive sheet 11 and the battery cell 12 can be connected in the above manner, since the conductive sheet 11 and the battery cell 12 are connected only through the contact point of the first protruding welding portion 115 and the battery cell 12, the connection between the conductive sheet 11 and the battery cell 12 is not firm and may cause the conductive sheet 11 and the battery cell 12 to separate during subsequent manufacturing or use.

[0032] In practical applications, the conductive sheet 11 is usually connected to a plurality of battery cells 12 in sequence. For example, one end of the conductive sheet 11 is connected to Figure 1 After the battery cell 12 on the left is connected, the other end of the conductive sheet 11 and the battery cell 12 on the right are connected by welding.

[0033] As shown in the welding sequence between the conductive sheet 11 and the multiple battery cells 12 described above, the conductive sheet 11 typically applies pressure to the battery cell 12 during the connection process to the right battery cell 12. Although the pressure applied by the conductive sheet 11 on the battery cell 12 is generally not significant, the connection between the conductive sheet 11 and the battery cell 12 lies solely at the first protruding weld portion 115 and its contact point. Furthermore, the distance between the two battery cells 12 connected by the conductive sheet 11 creates a certain pressure. This pressure exerted by the conductive sheet 11 on the right battery cell 12 creates a torque at the first protruding weld portion 115 connecting the conductive sheet 11 to the left battery cell 12, potentially causing the conductive sheet 11 to separate from the left battery cell 12.

[0034] To avoid the above-mentioned situation, the present application further provides a fixing unit 13 on the conductive sheet 11 and the battery core 12. The fixing unit 13 includes a fixing portion 131 and a pressing portion 133, wherein the fixing portion 131 is used to connect the shell 121 of the battery core 12, and the pressing portion 133 is used to contact and press the conductive sheet 11, so as to increase the connection strength between the conductive sheet 11 and the battery core 12.

[0035] In an embodiment of the present application, the fixing unit 13 can be a metal sheet, wherein the fixing portion 131 and the pressing portion 133 have different setting heights. For example, the fixing portion 131 is connected to the pressing portion 133 through a connecting portion 132, wherein the fixing portion 131 is roughly parallel to the pressing portion 133, and the connecting portion 132 has an included angle greater than 90 degrees with the fixing portion 131 and the pressing portion 133. In the drawings of the present application, the included angle is described as 90 degrees, so that the cross section of the fixing unit 13 is in a stepped shape.

[0036] In addition, in the drawings of the present application, the connecting portion 132 of the fixing unit 13 is attached to the side surface of the conductive sheet 11, but in different embodiments, the connecting portion 132 of the fixing unit 13 can also have a gap with the conductive sheet 11.

[0037] In actual application, when the conductive sheet 11 is connected to one of the battery cores 12, the fixing unit 13 can be arranged on the battery core 12 connected to the conductive sheet 11, so as 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, so as to avoid the separation of the conductive sheet 11 from the battery core 12 which has been connected during the connection of the conductive sheet 11 to other battery cores 12.

[0038] In an embodiment of the present application, the number of the fixing units 13 and the number of the battery cores 12 are both plural, wherein each fixing unit 13 is connected to each battery core 12.

[0039] The fixing portion 131 of the fixing unit 13 can be connected to the shell 121 of the battery core 12 by welding, and the pressing portion 133 of the fixing unit 13 can also be connected to the conductive sheet 11 by welding, such as resistance welding. Therefore, after the welding between the first surface 111 of the conductive sheet 11 and the shell 121 of the battery core 12 is completed by the welding equipment, the same welding equipment can be used to weld the fixing unit 13, the shell 121 of the battery core 12 and the second surface 113 of the conductive sheet 11.

[0040] 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 a metal material with low conductivity, so as to facilitate the connection of the fixing unit 13, the battery core 12 and the conductive sheet 11 by welding. For example, the fixing unit 13 can be a nickel sheet. Specifically, the conductivity of the fixing unit 13 can be less than that of the conductive sheet 11, and the thickness of the fixing unit 13 can also be less than that of the conductive sheet 11.

[0041] In an embodiment of the present application, the surface of the pressing portion 133 of the fixing unit 13 can be provided with at least one second protruding welding portion 135, wherein the pressing portion 133 connects the second surface 113 of the conductive sheet 11 through the second protruding welding portion 135. The provision 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 by welding.

[0042] In addition, the surface of the fixing portion 131 of the fixing unit 13 can also be provided with at least one third protruding welding portion 137, wherein the fixing portion 131 connects the battery core 12 through the third protruding welding portion 137. The provision of the second protruding welding portion 135 and the third protruding welding portion 137 in the fixing unit 13 is only an embodiment of the present application, and is not a limitation of the claims of the present application.

[0043] In addition, the pressing portion 133 of the fixing unit 13 can cover the conductive sheet 11 above the first protruding welding portion 115, so that the pressing portion 133 overlaps the first protruding welding portion 115, which facilitates further strengthening the connection between the conductive sheet 11 and the battery core 12 by the fixing unit 13.

[0044] In the above-mentioned embodiments of the present application, the fixing unit 13 is made of metal and connects the battery core 12 and the conductive sheet 11 by welding. In different embodiments, the fixing unit 13 can also be non-metallic, for example, the fixing unit 13 can be plastic and can connect the battery core 12 and / or the conductive sheet 11 by gluing or ultrasonic welding. The fixing unit 13 being made of metal is only an embodiment of the present application, and is not a limitation of the claims of the present application.

[0045] In addition, when the fixing unit 13 connects the battery core 12 and the conductive sheet 11 by gluing or ultrasonic welding, the fixing unit 13 can not be provided with the second protruding welding portion 135 and the third protruding welding portion 137.

[0046] In the present application Figure 2In some embodiments, the conductive sheet 11 has a fork-like appearance, and the end of the conductive sheet 11 has a plurality of branches 117, wherein the branches 117 are spaced apart from each other, for example, the two ends of the conductive sheet 11 have a plurality of branches 117. The first protruding welding part 115 is arranged on each branch 117 of the conductive sheet 11, and the branches 117 on the same end of the conductive sheet 11 are connected to the same battery core 12.

[0047] As shown in Figure 3 and Figure 4 , the main difference between the embodiments of the present application and Figure 1 and Figure 2 is that, Figure 1 and Figure 2 In some embodiments, each battery core 12 is provided with a fixing unit 13, wherein the number of fixing units 13 is the same as the number of battery cores 12, and the fixing units 13 are used to strengthen the connection between the ends of the conductive sheet 11 and the battery cores 12.

[0048] In Figure 3 and Figure 4 , a plurality of battery cores 12 share the same fixing unit 13. In the embodiments of the present application, the fixing unit 13 includes two fixing parts 131 and a pressing part 133, wherein the two fixing parts 131 of the fixing unit 13 are connected to different battery cores 12, and the pressing part 133 spans the two ends of the conductive sheet 11. The pressing part 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 towards the battery core 12.

[0049] Specifically, the fixing unit 13 is arranged along the conductive sheet 11, wherein the two fixing parts 131 of the fixing unit 13 are welded to two different battery cores 12, and the pressing part 133 of the fixing unit 13 can not be welded to the second surface 113 of the conductive sheet 11. In different embodiments, the pressing part 133 of the fixing unit 13 can also be welded to the second surface 113 of the conductive sheet 11 to further strengthen the fixing effect of the fixing unit 13.

[0050] As shown in Figure 5 and Figure 6 , in the embodiments of the present application, each battery core 12 is provided with a fixing unit 13, wherein the number of fixing units 13 is the same as the number of battery cores 12. The fixing unit 13 of the present embodiment includes two fixing parts 131 and a pressing part 133, wherein the two fixing parts 131 of the fixing unit 13 are connected to the same battery core 12, and the pressing part 133 contacts and covers part of the second surface 113 of the conductive sheet 11, and presses the conductive sheet 11 towards the battery core 12.

[0051] Since the fixing portions 131 at both ends of the fixing unit 13 are welded on the same housing 121 of the battery cell 12, the pressing portion 133 of the fixing unit 13 does not need to be welded on 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 on the second surface 113 of the conductive sheet 11 to further strengthen the fixing effect of the fixing unit 13.

[0052] The above description is only some embodiments of the present application, and is not intended to limit the scope of the present application. Any equivalent changes and modifications made in accordance with the shape, structure, features and spirit of the present application described in the claims should be included in the scope of the present application.

Claims

1. A battery conductive frame, characterized in that: include: A conductive sheet comprising a first surface and a second surface, wherein the first surface and the second surface are two surfaces facing each other; a plurality of first protruding welding portions, disposed on the first surface of the conductive sheet and used for connecting a plurality of battery cells; and The fixing unit includes a fixing portion and at least one pressing portion, wherein the fixing portion is used to connect the plurality of battery cells, and the pressing portion is used to press the conductive sheet.

2. The battery conductive frame according to claim 1, characterized in that: The pressing portion of the fixing unit overlaps with the plurality of first protruding welding portions of the conductive sheet.

3. The battery conductive frame according to claim 1, characterized in that: It also includes at least one 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 second surface of the conductive sheet through the at least one second protruding welding portion.

4. The battery conductive frame according to claim 3, characterized in that: It also includes at least one 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 multiple battery cells through the at least one third protruding welding portion.

5. The battery conductive frame according to claim 1, characterized in that: The fixing unit includes two fixing parts, each connected to a different one of the plurality of battery cells.

6. The battery conductive frame according to claim 1, characterized in that: There are multiple fixing units, each of which is connected to the multiple battery cells.

7. The battery conductive frame according to claim 6, characterized in that: The fixing unit includes two pressing parts, and is connected to the same battery core through the two pressing parts.

8. The battery conductive frame according to claim 1, characterized in that: The conductive sheet includes a plurality of branches, and the plurality of first protruding portions are disposed on the plurality of branches.

9. The battery conductive frame according to claim 1, characterized in that: The conductivity of the fixing unit is lower than the conductivity of the conductive sheet.

10. The battery conductive frame according to claim 1, characterized in that: The thickness of the fixing unit is smaller than the thickness of the conductive sheet.

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