Full-string type liquid metal battery system with busbar connection structure

Abstract

The utility model provides a full-string type liquid metal battery system with a busbar connection structure, which relates to the technical field of battery systems and comprises a positive electrode output end, a negative electrode output end, a plurality of liquid metal batteries and a plurality of busbars, the positive pole and the negative pole of the liquid metal battery are respectively a battery cell positive pole rod and a battery cell negative pole rod, the busbar comprises a bridge connecting piece and two lock catch rings, the lock catch rings are respectively locked and fixed on the battery cell positive pole rod and the battery cell negative pole rod, and the bridge connecting piece is connected with the two lock catch rings. The busbar connecting structure has the beneficial effects that the busbar connecting structure is stable and reliable, the dismounting and mounting processes are flexible and convenient, and meanwhile, the contact area between the lock catch ring and the positive and negative electrodes of the liquid metal battery is large, so that the electric bearing capacity of the busbar can be greatly improved. The full-string type liquid metal battery system can effectively solve the problem of insufficient soldering of the battery cells of traditional battery laser welding, the electrode connection structure of the battery system is simplified, and the production cost of the liquid metal battery system is reduced.

Description

Technical Field

[0001] The utility model relates to the field of battery systems, in particular to a full-series liquid metal battery system with a busbar connection structure. Background Art

[0002] Liquid metal battery is a new type of battery. The normal operating environment temperature of the battery is 420℃-480℃. There is no mature electrical connection method for liquid metal batteries on the market. The current traditional battery connection method is mainly laser welding. The electrical connection material is the bus. The bus is made of steel-clad copper. The existing laser welding battery connection solution has the following defects: the bus welding method cannot be disassembled, the electrical connection and battery cell recycling process are complicated and costly; the risk of cold welding is high in the arc surface welding process between the bus and the battery cell pole. Utility Model Content

[0003] In view of this, in order to improve the reliability of the electrode connection structure of the liquid metal battery system, and enable it to be flexibly disassembled and have a higher electrical carrying capacity, the utility model provides a full-series liquid metal battery system with a busbar connection structure, including a positive electrode output terminal, a negative electrode output terminal, a plurality of liquid metal batteries and a plurality of busbars;

[0004] All liquid metal batteries are equipped with positive and negative electrode rods at their ends;

[0005] The busbar includes a bridge connector and two locking rings connected at both ends of the bridge connector, the two locking rings are respectively a first locking ring and a second locking ring, the busbar connects two adjacent liquid metal batteries, the first locking ring and the second locking ring are respectively sleeved and fixed on the positive electrode rod and the negative electrode rod of the two liquid metal batteries connected to the busbar, so that all the liquid metal batteries are connected in series to form a liquid metal battery group, wherein the negative electrode rod of the liquid metal battery cell at the head end of the liquid metal battery group is connected to the negative electrode output end, and the positive electrode rod of the liquid metal battery cell at the tail end of the liquid metal battery group is connected to the positive electrode output end.

[0006] Furthermore, the middle part of the locking ring is bent into a ring shape, so that the middle part of the locking ring can be sleeved on the positive pole of the battery cell or the negative pole of the battery cell, and the two ends of the locking ring are respectively a long connection end and a short connection end, the short connection end is connected to the long connection end, and the long connection end is connected to the bridge connector.

[0007] Furthermore, a locking bolt is provided on the locking ring, and a first locking hole and a second locking hole are respectively provided on the short connecting end and the long connecting end. The first locking hole and the second locking hole are aligned with each other. The locking bolt passes through the first locking hole and the second locking hole to connect the short connecting end to the long connecting end.

[0008] Furthermore, a third locking hole is provided on the long connecting end, and a connecting hole and a connecting bolt are provided on the end of the bridge connecting piece. The connecting bolt passes through the third locking hole and the connecting hole to connect the long connecting end to the end of the bridge connecting piece.

[0009] Furthermore, the bridge connector and the two locking rings are both made of copper, and the bridge connector and the two locking rings are both provided with a nickel plating layer.

[0010] Furthermore, the thickness of the nickel plating layer is not less than 8 um.

[0011] Furthermore, the locking bolt and the connecting bolt are both made of stainless steel.

[0012] Furthermore, it also includes a voltage collection harness, which includes a plurality of voltage collection wires, and each bridge connector is connected to one of the voltage collection wires.

[0013] Furthermore, it also includes a temperature collection harness, which includes a plurality of temperature collection wires. A thermocouple is provided at the end of each temperature collection wire, and the thermocouple is tightly fixed to the side wall of the liquid metal battery.

[0014] Furthermore, it also includes a bottom plate and a limit plate, the bottoms of all liquid metal batteries are supported on the bottom plate, a plurality of limit holes are provided on the limit plate, each liquid metal battery passes through a limit hole, the limit plate is fixed on the bottom plate, the limit plate and the bottom plate are arranged in parallel, and there is a gap between the two.

[0015] The utility model has the following beneficial effects of a full-string liquid metal battery system with a busbar connection structure: the full-string liquid metal battery system connects the positive and negative electrodes of two adjacent liquid metal batteries through a busbar, wherein the positive and negative electrodes of the liquid metal battery are respectively the positive electrode rod and the negative electrode rod of the battery cell, the busbar includes a bridge connector and two locking rings, the locking rings are respectively locked and fixed on the positive electrode rod and the negative electrode rod of the battery cell, the bridge connector connects the two locking rings, the connection structure is stable and reliable and can be flexibly disassembled and installed, and at the same time, the locking ring has a large contact area with the positive and negative electrodes of the liquid metal battery, which can greatly improve the electrical carrying capacity of the busbar. The full-string liquid metal battery system can effectively solve the problem of cell cold welding in traditional battery laser welding, and simplify the electrode connection structure of the battery system, reducing the production cost of the liquid metal battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a full-series liquid metal battery system with a bus connection structure according to an embodiment of the utility model.

[0017] Figure 2 yes Figure 1 A three-dimensional diagram of the busbar.

[0018] Figure 3 yes Figure 1 Top view of the busbar.

[0019] In the above figure: 1-bottom plate, 11-limiting plate, 2-liquid metal battery, 3-battery cell positive pole, 31-positive output terminal, 4-battery cell negative pole, 41-negative output terminal, 5-bus, 51-bridge connector, 52-first locking ring, 53-second locking ring, 54-connecting bolt, 55-locking bolt, 6-voltage collection harness, 61-voltage collection line, 7-voltage collection connecting ring, 8-temperature collection harness. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model clearer, the implementation mode of the utility model will be further described below in conjunction with the accompanying drawings.

[0021] Please refer to Figures 1 to 3 The utility model provides a full-string liquid metal battery system with a busbar connection structure, including a bottom plate 1, a limiting plate 11, a positive output terminal 31, a negative output terminal 41, a plurality of liquid metal batteries 2 and a plurality of busbars 5.

[0022] All liquid metal batteries 2 are densely arranged in parallel, and the bottom of the liquid metal battery 2 is supported on the bottom plate 1. The limiting plate 11 is provided with a plurality of limiting holes, and each liquid metal battery 2 passes through a limiting hole. The limiting plate 11 is fixed on the bottom plate 1. The limiting plate 11 and the bottom plate 1 are arranged in parallel, and there is a gap between the two, so that the limiting plate 11 limits the liquid metal battery 2 from the middle. The ends of all liquid metal batteries 2 are provided with a positive electrode rod 3 and a negative electrode rod 4, and the positive electrode rod 3 and the negative electrode rod 4 are both cylindrical structures.

[0023] The busbar 5 includes a bridge connector 51 and two locking rings connected to both ends of the bridge connector 51, the two locking rings are respectively a first locking ring 52 and a second locking ring 53, the busbar 5 connects two adjacently arranged liquid metal batteries 2, the first locking ring 52 and the second locking ring 53 are respectively sleeved and fixed on the positive electrode rod 3 and the negative electrode rod 4 of the two liquid metal batteries 2 connected to the busbar, the number of the liquid metal batteries 2 is N, and the number of the busbars 5 is N-1, so that the busbar 5 can connect all the liquid metal batteries in series into a liquid metal battery group, wherein the negative electrode rod 4 of the liquid metal battery cell at the head end of the liquid metal battery group is connected to the negative electrode output end, and the positive electrode rod 3 of the liquid metal battery cell at the tail end of the liquid metal battery group is connected to the positive electrode output end, and the liquid metal battery group outputs electrical energy through the positive electrode output end and the negative electrode output end.

[0024] Preferably, the bridge connector 51 is a metal plate structure, the locking ring is a ring structure formed by bending the middle of the metal plate, the middle of the locking ring can be sleeved on the positive pole 3 or the negative pole 4 of the battery cell, the two ends of the locking ring are respectively a long connection end and a short connection end, the short connection end is connected to the long connection end, and the long connection end is connected to the bridge connector 51. The locking ring is also provided with a locking bolt 55, and the short connection end and the long connection end are respectively provided with a first locking hole and a second locking hole, the first locking hole and the second locking hole are aligned with each other, and the locking bolt 55 passes through the first locking hole and the second locking hole to connect the short connection end to the long connection end. The long connection end is also provided with a third locking hole, and the end of the bridge connector 51 is provided with a connection hole and a connection bolt 54, and the connection bolt 54 passes through the third locking hole and the connection hole to connect the long connection end to the end of the bridge connector 51. In this embodiment, the bridge connector 51 and the two locking rings are made of copper, and the bridge connector 51 and the two locking rings are provided with a nickel plating layer. The thickness of the nickel plating layer is not less than 8um. The locking bolt 55 and the connecting bolt 54 are both made of stainless steel.

[0025] In the above structure, the locking ring of the busbar 5 is fixed to the positive pole 3 or the negative pole 4 of the battery cell by a locking bolt 55, and the bridge connector 51 of the busbar 5 is fixed to the long connection end of the locking ring by a connecting bolt 54, so that the electrode connection of the liquid metal battery can be reliable and easy to install and disassemble. This structure can effectively solve the problem of cold welding of the battery cell in traditional battery laser welding, and simplify the electrode connection structure of the battery system, and reduce the production cost of the liquid metal battery 2 system. The locking ring of the bridge connector 51 of the busbar 5 is made of a strip of metal plate, so that the locking ring and the bridge connector 51, and the locking ring and the liquid metal battery electrode are in surface contact, thereby increasing the contact area between the locking ring and the electrode and the contact area between the locking ring and the bridge connector 51, thereby improving the electrical carrying capacity of the liquid metal battery system.

[0026] Preferably, the full-string liquid metal battery system also includes a voltage collection harness 6 and a temperature collection harness 8, wherein the voltage collection harness 6 includes a plurality of voltage collection wires 61, and a voltage collection connecting ring 7 is provided at the end of each voltage collection wire 61, wherein the voltage collection connecting ring 7 is sleeved on the connecting bolt 54 and is pressed against the bridge connector 51 by the connecting bolt 54, so that each bridge connector 51 is connected to one of the voltage collection wires, and the voltage collection harness 6 is used to collect voltage data of each liquid metal battery 2.

[0027] The temperature collection harness 8 includes multiple temperature collection wires, each of which has a thermocouple at the end thereof. The thermocouple is fixed tightly to the side wall of the liquid metal battery 2 by welding. The temperature collection harness 8 is used to collect temperature data of each liquid metal battery 2 .

[0028] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0029] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A full-series liquid metal battery system with a busbar connection structure, characterized in that: It includes a positive output terminal, a negative output terminal, a plurality of liquid metal batteries, and a plurality of bus bars; All liquid metal batteries are equipped with positive and negative electrode rods at their ends; The busbar includes a bridge connector and two locking rings connected at both ends of the bridge connector, the two locking rings are respectively a first locking ring and a second locking ring, the busbar connects two adjacent liquid metal batteries, the first locking ring and the second locking ring are respectively sleeved and fixed on the positive electrode rod and the negative electrode rod of the two liquid metal batteries connected to the busbar, so that all the liquid metal batteries are connected in series to form a liquid metal battery group, wherein the negative electrode rod of the liquid metal battery at the head end of the liquid metal battery group is connected to the negative electrode output end, and the positive electrode rod of the liquid metal battery at the tail end of the liquid metal battery group is connected to the positive electrode output end.

2. A full-series liquid metal battery system with a busbar connection structure according to claim 1, characterized in that: The middle part of the locking ring is bent into a ring shape, so that the locking ring can be put on the positive pole or the negative pole of the battery cell. The two ends of the locking ring are respectively a long connection end and a short connection end. The short connection end is connected to the long connection end, and the long connection end is connected to the bridge connector.

3. A full-series liquid metal battery system with a busbar connection structure according to claim 2, characterized in that: The locking ring is also provided with a locking bolt, and the short connecting end and the long connecting end are respectively provided with a first locking hole and a second locking hole, the first locking hole and the second locking hole are aligned with each other, and the locking bolt passes through the first locking hole and the second locking hole to connect the short connecting end to the long connecting end.

4. A full-series liquid metal battery system with a busbar connection structure according to claim 3, characterized in that: The long connecting end is also provided with a third locking hole, and the end of the bridge connecting piece is provided with a connecting hole and a connecting bolt. The connecting bolt passes through the third locking hole and the connecting hole to connect the long connecting end to the end of the bridge connecting piece.

5. A full-series liquid metal battery system with a busbar connection structure according to claim 2, characterized in that: The bridge connector and the two locking rings are both made of copper, and the bridge connector and the two locking rings are both provided with a nickel plating layer.

6. A full-series liquid metal battery system with a busbar connection structure according to claim 5, characterized in that: The thickness of the nickel plating layer is not less than 8um.

7. A full-series liquid metal battery system with a busbar connection structure according to claim 4, characterized in that: The locking bolt and the connecting bolt are both made of stainless steel.

8. The full-series liquid metal battery system with a busbar connection structure according to claim 1, characterized in that: It also includes a voltage collection harness, which includes a plurality of voltage collection wires, and each bridge connector is connected with one of the voltage collection wires.

9. A full-series liquid metal battery system with a busbar connection structure according to claim 1, characterized in that: It also includes a temperature collection harness, which includes a plurality of temperature collection wires. A thermocouple sheet is provided at the end of each temperature collection wire, and the thermocouple sheet is tightly fixed to the side wall of the liquid metal battery.

10. A full-series liquid metal battery system with a busbar connection structure according to claim 1, characterized in that: It also includes a bottom plate and a limiting plate. The bottoms of all liquid metal batteries are supported on the bottom plate. The limiting plate is provided with a plurality of limiting holes. Each liquid metal battery passes through a limiting hole. The limiting plate is fixed on the bottom plate. The limiting plate and the bottom plate are arranged in parallel with a gap between them.

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