Soft package battery cell support and electric connection buckle thereof

Abstract

The invention relates to the field of lithium batteries, and discloses a soft package battery cell bracket and an electric connection buckle thereof. The soft package battery cell support comprises supports and liquid cooling plates, the liquid cooling plates are located in the middles of the inner sides of the supports, battery cells are placed between the liquid cooling plates in the middles of the adjacent supports, and the large faces of the battery cells make contact with the liquid cooling plates for heat dissipation. The supports and the water inlets and outlets of the liquid cooling plate are integrally formed through injection molding, the water inlets and outlets of the supports are of buckle type sealing structures, and the water inlets and outlets of the adjacent supports are sequentially connected in series to form water circulation. The electric connection buckle comprises a plastic shell and a built-in conductive device, and the conductive device and the conductive block of the support are connected in series and in parallel in a clamping mode to achieve series connection and parallel connection of the whole bag. The liquid cooling plate is arranged in the support, the structural strength of the support is improved through the manufacturing process of embedding and injection integrated forming, meanwhile, the battery cells can be cooled, the adjacent battery cells are separated through the support, and the electrical insulating property of the whole pack is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of lithium batteries, and in particular to a soft-pack battery cell bracket and an electrical connection buckle thereof. Background Art

[0002] With the popularization of lithium-ion batteries, soft-pack batteries are favored by users for their small size, light weight and high energy density. However, because their outer shell is made of aluminum-plastic film, they have poor rigidity and unstable structural performance. During the stacking process of the battery cell tabs, bending and welding are performed, which may cause leakage, resulting in the entire package being scrapped and ineffective. After the batteries are stacked into groups, the high-rate discharge of the modules may cause heating of the batteries, which may easily cause safety hazards such as thermal runaway of the entire package. When an abnormality such as zero voltage occurs in a single battery cell, the traditional battery series-parallel connection process may cause the entire package to be scrapped, increasing the user's cost. Summary of the invention

[0003] The purpose of the present invention is to provide a soft-pack lithium battery pack bracket, which can make the module have a strong structural strength. At the same time, the bracket is designed with a detachable electrical connection buckle. When a local battery cell is abnormal, the detachable electrical connection buckle can be used to directly replace the single battery cell, avoiding the scrapping of the entire pack and reducing the user's use cost.

[0004] The technical solution of the present invention is: A soft-pack battery cell bracket comprises a bracket and a liquid cooling plate, wherein the liquid cooling plate is located in the middle of the inner side of the bracket, and the battery cells are placed between the liquid cooling plates in the middle of adjacent brackets, and the large surface of the battery cells contacts the liquid cooling plate for heat dissipation.

[0005] Preferably, the bracket and the water inlet and outlet of the liquid cooling plate are integrally injection molded, the water inlet and outlet of the bracket adopt a snap-on sealing structure, and the water inlets and outlets of adjacent brackets are connected in series in sequence to form a water circulation.

[0006] Preferably, a battery cell disassembly opening is provided at the bottom of the bracket, and the disassembly opening is configured to allow directional disassembly and assembly of a single battery cell.

[0007] Preferably, a conductive block is integrated inside the bracket, and the conductive block is integrally formed with the bracket by injection molding and is arranged at the welding position of the battery cell tab.

[0008] Preferably, a U-shaped protective structure is formed inside the bracket, and the U-shaped protective structure is arranged around the battery cell and provides position limiting protection.

[0009] Preferably, it also includes an electrical connection buckle, which includes a plastic shell and a built-in conductive device, and the conductive device and the conductive block of the bracket are connected in series and parallel to achieve the series connection of the whole package through a snap connection.

[0010] Preferably, the electrical connection buckle is a single buckle or multiple rows of buckles; the interior of the bracket is designed with conductive foam, and the electrical connection buckle and the bracket achieve circuit conduction by compressing the conductive foam.

[0011] Preferably, the electrical connection buckle is provided with a fuse device inside, and when an overcurrent condition occurs in the entire package, the fuse device is triggered to cut off the circuit.

[0012] Preferably, the electrical connection buckle is a detachable buckle.

[0013] The advantages of the present invention are: 1. The present invention provides a soft-pack battery cell bracket, wherein a liquid cooling plate is arranged inside the bracket, and the manufacturing process of embedded injection molding improves the structural strength of the bracket, and can dissipate heat for the battery cell at the same time, and the bracket is used to separate adjacent battery cells, which effectively improves the electrical insulation of the whole package.

[0014] 2. The left and right brackets of the present invention are connected by a snap-on method, and the connection port is the water inlet and outlet of the cold plate, which is designed with an error-proofing function to ensure that the left and right brackets are connected and have a water cooling circulation function, thereby improving the thermal stability of the entire package; 3. The bracket of the present invention is designed with a battery cell tab fixing groove on the right side to avoid leakage of the battery cell due to external force during the production process of the battery cell tab, thereby improving the safety performance of the whole package; at the same time, there is a transfer block inside the bracket, and the embedded injection manufacturing process is adopted to achieve welding of the battery cell tab without bending, thereby simplifying the manufacturing process of module production and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a structural schematic diagram of the soft-pack battery cell support of the present invention; Figure 2 It is a schematic diagram of the front side of bracket A; Figure 3 is a schematic diagram of the rear side of bracket A; Figure 4 It is a schematic diagram of the front side of bracket B; Figure 5 is a schematic diagram of the rear side of bracket B; Figure 6 This is a schematic diagram of water circulation in the soft-pack battery cell support; Figure 7 This is a schematic diagram of the buckle seal design for the water inlet and outlet of the bracket; Figure 8 Design a schematic diagram for the conductive block; Fig. 9 Design another perspective schematic diagram for the conductive block; Fig.10 is a schematic diagram of an electrical connection buckle; Fig.11 It is a schematic diagram of a bracket for connecting multiple rows of electrical connection clips; Fig.12 It is a schematic diagram of the interior of the electrical connection buckle; Fig.13 is a cross-sectional view of an electrical connection buckle; Fig.14 It is a cross-sectional view of the electrical connection clip connection bracket. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, a soft-pack battery cell bracket proposed by the present invention includes a bracket 1 and a liquid cooling plate 2, wherein the liquid cooling plate 2 is located in the middle of the inner side of the bracket 1, and a battery cell 4 is placed between the liquid cooling plates 2 in the middle of adjacent brackets 1, and the large surface of the battery cell contacts the liquid cooling plate for heat dissipation. This composite method improves the overall structural strength of the bracket, and can dissipate heat from the large surface of the battery cell at the same time, with a large contact area and a fast heat dissipation speed, thereby avoiding the risk of thermal runaway of the entire pack during high-rate discharge.

[0017] The adjacent brackets are represented as bracket A and bracket B, respectively. Figure 2-5 As shown, they are schematic diagrams of the front and rear sides of bracket A and bracket B, respectively. A water inlet 11 is set at the upper left corner of the front side of bracket A, and a water outlet 12 is set at the lower right corner of the rear side of bracket A. A water inlet 11 is set at the lower left corner of the front side of bracket B, and a water outlet 12 is set at the upper right corner of the rear side of bracket B. The water outlet 12 of bracket A is connected to the water inlet 11 of bracket B. The water inlets and outlets of multiple brackets are connected in sequence to form a water cycle, such as Figure 6 shown.

[0018] like Figure 7 As shown, the bracket and the water inlet and outlet of the liquid cooling plate are integrally injection molded, and the water inlet and outlet of the bracket adopt a snap-on sealing structure, which includes a snap 13 and a sealing ring 14. The sealing ring 14 is sleeved at the junction of the water inlet and outlet of the liquid cooling plate, and the snap 13 fixes the interface and the sealing ring 14. The water circulation connection provides a reliable connection for the left and right brackets, which improves the thermal stability of the whole package. At the same time, a disassembly port is designed at the bottom, and the disassembly port is configured to allow directional disassembly and assembly of the single battery cell. When a single battery cell fails, it can be disassembled and replaced through the disassembly port, avoiding the risk of scrapping the whole package and reducing the user-end use cost.

[0019] like Figure 8 , 9 As shown, a conductive block 15 is designed inside the bracket. The conductive block 15 is integrally formed with the bracket by injection molding and is arranged at the welding position of the battery cell tab. The soft-pack battery is placed in the bracket for tab welding. The welding can be performed without bending the tab, thereby avoiding the bending and crushing of the battery cell tab to cause leakage of the battery cell. At the same time, a U-shaped protective structure is formed inside the bracket. The U-shaped protective structure surrounds the battery cell and provides limit protection, thereby providing strong structural protection for the battery cell and improving the safety performance of the entire package.

[0020] like Fig.10 As shown, the present invention provides an electrical connection buckle 3, the buckle shell is a plastic shell 31, and a conductive device 32 is designed inside. The bracket can be designed as a single buckle or a plurality of rows of buckles, and the whole package is connected in series and parallel by a clamping method with the conductive block part of the bracket, such as Fig.11 shown.

[0021] like Fig.12 As shown, the electrical connection buckle has a fuse device 33 inside, and when the whole package has an overcurrent condition, the fuse device 33 is triggered to cut off the circuit, thereby avoiding safety accidents caused by excessive current in the whole package and improving the safety of the whole package.

[0022] like Fig.13 , 14 As shown, the bracket is designed with conductive foam 34, and the electrical connection buckle 3 and the bracket 1 are connected to the conductive block 15 by compressing the conductive foam 34. The interference fit method avoids the problem of electrical connection failure of the whole package under vibration conditions, and improves the safety of the whole package. At the same time, the buckle is a detachable buckle, and when a single battery cell is abnormal, it can be disassembled without a trace, avoiding the problem of the whole package being scrapped due to abnormal single battery cells, and reducing user costs.

[0023] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any modifications made according to the spirit of the main technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A soft-pack battery cell support, characterized in that: It includes a bracket and a liquid cooling plate. The liquid cooling plate is located in the middle of the inner side of the bracket. Battery cells are placed between the liquid cooling plates in the middle of adjacent brackets. The large surface of the battery cells is in contact with the liquid cooling plate for heat dissipation.

2. The soft-pack battery cell support according to claim 1, characterized in that: The bracket and the water inlet and outlet of the liquid cooling plate are integrally injection molded, the water inlet and outlet of the bracket adopt a snap-on sealing structure, and the water inlets and outlets of adjacent brackets are connected in series in sequence to form a water cycle.

3. The soft-pack battery cell support according to claim 2, characterized in that: A battery cell disassembly opening is provided at the bottom of the bracket, and the disassembly opening is configured to allow directional disassembly and assembly of a single battery cell.

4. The soft-pack battery cell support according to claim 2, characterized in that: A conductive block is integrated inside the bracket, and the conductive block is integrally formed with the bracket by injection molding and is arranged at the welding position of the battery cell tab.

5. The soft-pack battery cell support according to claim 4, characterized in that: A U-shaped protective structure is formed inside the bracket, and the U-shaped protective structure is arranged around the battery core and provides position limiting protection.

6. The soft-pack battery cell support according to claim 4, characterized in that: It also includes an electrical connection buckle, which includes a plastic shell and a built-in conductive device. The conductive device and the conductive block of the bracket are connected in series and parallel to achieve the series connection of the whole package through a snap connection.

7. The soft-pack battery cell support according to claim 6, characterized in that: The electrical connection buckle is a single buckle or multiple rows of buckles; the interior of the bracket is designed with conductive foam, and the electrical connection buckle and the bracket achieve circuit conduction by compressing the conductive foam.

8. The soft-pack battery cell support according to claim 7, characterized in that: The electrical connection buckle is provided with a fuse device inside. When an overcurrent occurs in the entire package, the fuse device is triggered to cut off the circuit.

9. The soft-pack battery cell support according to claim 8, characterized in that: The electrical connection buckle is a detachable buckle.

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