Busbar anti-overheat structure

Abstract

The utility model belongs to the technical field of energy storage battery discloses busbar prevents overheating structure, including: insulating frame, the side wall of insulating frame one end is equipped with the spigot, cooling box, cooling box fixedly connected in the inside of insulating frame, and the circumferential side of cooling box is provided with cooling liquid inlet and cooling liquid outlet, first busbar, present channel steel shape structure, the slot of first busbar is towards cooling box and is inserted from the spigot until is tightly sleeved on cooling box, first electric core, first electric core fixedly connected in the upper end of cooling box, and first electric core has the first negative ear of being connected to the outer wall of first busbar, second electric core, second electric core fixedly connected in the lower end of cooling box, and second electric core has the second positive ear of being connected to the outer wall of first busbar. Further reduce the situation that busbar is easy high temperature overheating, thereby reduce the situation that the electric core support of adopting plastic support is easy to be influenced by the high temperature of busbar and the plastic deformation of outer frame and lose the insulation performance.

Description

Technical Field

[0001] This utility model belongs to the field of energy storage battery technology, specifically relating to a busbar overheat protection structure. Background Technology

[0002] Chinese utility model patent CN109904378A discloses a lithium battery energy storage module and a lithium battery energy storage assembly. Its specification specifically discloses the following technical contents: "The busbar 30 includes a first busbar 31, a second busbar 32 arranged in parallel, and a connecting plate 33 connecting the adjacent ends of the first busbar 31 and the second busbar 32. The first busbar 31 is welded to the tab 11 of the battery cell 10 installed in the first mounting surface 21, and the second busbar 32 is welded to the tab 11 of the battery cell 10 installed in the second mounting surface 22. The connecting plate 33 is fixedly connected to the tab fixing part 23. In some specific embodiments, two busbars 30 are generally connected to the same cell support 20 for connecting the left and right tabs 11 of a single-headed dual-tab soft-pack lithium battery cell," and "The cell support 20 is a plastic support."

[0003] Therefore, it can be seen that in the above-mentioned patent solution, the electrodes of the two battery cells are connected by being welded to the two ends of the busbar respectively.

[0004] However, the above-mentioned patented solution still has the following problems: the busbar is prone to overheating, which makes the battery cell support using plastic brackets susceptible to plastic deformation of the outer frame and loss of insulation performance due to the high temperature of the busbar. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a busbar overheat protection structure, thereby reducing the busbar's tendency to overheat, and thus reducing the likelihood of plastic frame deformation and loss of insulation performance of the battery cell support using plastic brackets due to the high temperature of the busbar.

[0006] The objective of this utility model can be achieved through the following technical solutions: The busbar overheat protection structure includes: An insulating frame, wherein an insertion port is provided on the side wall at one end of the insulating frame; A cooling tank is fixedly connected inside an insulating frame, and a coolant inlet and a coolant outlet are provided on the periphery of the cooling tank. The first busbar has a channel steel structure, with the slot of the first busbar facing the cooling box and being inserted from the socket until it is tightly fitted onto the cooling box; The first battery cell is fixedly connected to the upper end of the cooling box, and the first battery cell has a first negative electrode tab connected to the outer wall of the first busbar; The second battery cell is fixedly connected to the lower end of the cooling box, and the second battery cell has a second positive electrode tab connected to the outer wall of the first busbar.

[0007] The principles and technical effects of the above technical solution are as follows: The coolant enters the cooling tank through the coolant inlet and flows out through the coolant outlet. As the coolant flows through the cooling tank, the heat generated between the first negative electrode tab and the first busbar, the heat generated between the second positive electrode tab and the first busbar, and the heat generated by the first and second battery cells themselves are all transferred to the outer casing of the cooling tank. As the coolant flows through the cooling tank, it absorbs and carries away the heat from the outer casing, thus achieving cooling. This reduces the likelihood of the busbar overheating, thereby reducing the risk of plastic-framed battery cells being susceptible to plastic deformation and loss of insulation due to the high temperature of the busbar.

[0008] In a preferred embodiment, the present invention can be further configured such that the first negative electrode tab and the second positive electrode tab both extend along the outer contour of the first busbar until they are overlapped and welded together.

[0009] In a preferred embodiment, the present invention can be further configured such that the coolant inlet and coolant outlet extend outward through the sidewall of the insulating frame.

[0010] In a preferred embodiment, the present invention can be further configured such that: a heat-conducting sheet is fixedly connected between the first battery cell and the cooling box, and between the second battery cell and the cooling box; a plurality of heat-conducting columns are fixedly connected between the upper and lower heat-conducting sheets, and the heat-conducting columns penetrate the cooling box.

[0011] In a preferred embodiment, the present invention can be further configured such that a first slot and a second slot are provided on the side wall at the other end of the insulating frame; The overheat protection structure of the busbar also includes: The second busbar is inserted into the first slot from the outside of the insulating frame and connected to the end of the first battery cell that is not connected to the second battery cell; The third busbar is inserted into the second slot from the outside of the insulating frame and connected to the end of the second battery cell that is not connected to the first battery cell; The first battery cell also has a first positive electrode connected to the second busbar, and the second battery cell also has a second negative electrode connected to the third busbar.

[0012] In a preferred embodiment, the present invention can be further configured such that: a positioning blind hole is provided on the upper end face of the side wall of the insulating frame, and a positioning pin is fixedly connected to the lower end face of the side wall of the insulating frame and directly below the positioning blind hole.

[0013] In a preferred embodiment, the present invention can be further configured such that: the side wall of the insulating frame is provided with a through mounting hole.

[0014] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows: A fixed connection refers to a connection in which parts or components are fixed in place, with no relative movement between them. These connections are divided into two types: detachable and non-detachable.

[0015] (1) Detachable connections use screws, splines, wedges, etc. to fix parts together. This type of connection can be disassembled during maintenance without damaging the parts. However, the specifications of the connecting parts used must be correct (such as the length of bolts, keys, wedges) and properly tightened.

[0016] (2) Non-removable connections mainly refer to welding, riveting, and tenon joints. Since disassembly is required by forging, sawing, or oxyacetylene cutting during repair or replacement, the parts generally cannot be reused. At the same time, attention should be paid to process quality, technical inspection, and remedial measures (such as correction, polishing, etc.) when making connections.

[0017] A threaded connection is a detachable connection in which threaded parts (or the threaded portion of the connected parts) are joined together to form a single unit.

[0018] A sliding connection refers to two objects that are in contact but not fixed, and can slide relative to each other.

[0019] A rotating connection is a connection between parts that allows the parts to rotate relative to each other.

[0020] The beneficial effects of this utility model are: The coolant enters the cooling tank through the coolant inlet and flows out through the coolant outlet. As the coolant flows through the cooling tank, the heat generated between the first negative electrode tab and the first busbar, the heat generated between the second positive electrode tab and the first busbar, and the heat generated by the first and second battery cells themselves are all transferred to the outer casing of the cooling tank. As the coolant flows through the cooling tank, it absorbs and carries away the heat from the outer casing, thus achieving cooling. This reduces the likelihood of the busbar overheating, thereby reducing the risk of plastic-framed battery cells being susceptible to plastic deformation and loss of insulation due to the high temperature of the busbar. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2This is a schematic diagram of the insulating frame structure according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the busbar structure according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the cooling box structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the heat-conducting sheet structure according to an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Based on the concept of this application, combined with Figures 1 to 6 This describes an embodiment of a busbar overheat protection structure. Specifically, the busbar overheat protection structure is constructed as a split structure, which has an insulating frame 1, a cooling tank 2, and a first busbar 3 working together. Coolant enters the cooling tank 2 through the coolant inlet 21 and flows out through the coolant outlet 22. When the coolant flows through the cooling tank 2, the heat generated between the first negative electrode tab 42 and the first busbar 3, the heat generated between the second positive electrode tab 51 and the first busbar 3, and the heat generated by the first battery cell 4 and the second battery cell 5 themselves are all transferred to the outer shell of the cooling tank 2. When the coolant flows through the cooling tank 2, the coolant absorbs the heat from the outer shell of the cooling tank 2 and carries it away, thereby achieving cooling. This reduces the likelihood of the busbar overheating, and thus reduces the likelihood of the battery cell support using a plastic support being affected by the high temperature of the busbar, resulting in plastic deformation of the outer frame and loss of insulation performance.

[0026] like Figures 1 to 6 As shown, the busbar overheat protection structure includes: An insulating frame 1 has an insertion port 11 on the side wall at one end; Cooling box 2 is fixedly connected inside the insulating frame 1. Cooling box 2 has a coolant inlet 21 and a coolant outlet 22 on its periphery. The first busbar 3 has a channel steel structure. The slot of the first busbar 3 faces the cooling box 2 and is inserted from the inlet 11 until it is tightly fitted onto the cooling box 2. The first battery cell 4 is fixedly connected to the upper end of the cooling box 2. The first battery cell 4 has a first negative electrode tab 42 connected to the outer wall of the first busbar 3. The second battery cell 5 is fixedly connected to the lower end of the cooling box 2. The second battery cell 5 has a second positive electrode tab 51 connected to the outer wall of the first busbar 3.

[0027] In use, the coolant enters the cooling tank 2 through the coolant inlet 21 and flows out through the coolant outlet 22. When the coolant flows through the cooling tank 2, the heat generated between the first negative tab 42 and the first busbar 3, the heat generated between the second positive tab 51 and the first busbar 3, and the heat generated by the first battery cell 4 and the second battery cell 5 themselves are all transferred to the outer shell of the cooling tank 2. When the coolant flows through the cooling tank 2, the coolant absorbs the heat from the outer shell of the cooling tank 2 and carries it away, thereby achieving cooling.

[0028] In one embodiment of this utility model, the first negative electrode tab 42 and the second positive electrode tab 51 both extend along the outer contour of the first busbar 3 until they are overlapped and welded together.

[0029] It is important to emphasize that in conventional battery pack setups, the negative tab of the first cell 4 and the positive tab of the second cell 5 are typically laser-welded to both ends of the busbar, meaning the negative tab of the first cell 4 and the positive tab of the second cell 5 are electrically connected via the busbar. However, the inventor of this invention has discovered that in the energy storage battery cell of this case, due to the presence of an insulating frame 1, if the busbar adopts the aforementioned conventional arrangement, on the one hand, when the first negative tab 42 and the second positive tab 51 are laser-welded and fixed to the first busbar 3, it will cause the first busbar 3 to overheat, resulting in the loss of insulation performance of the insulating frame 1 and thermal deformation of the outer frame of the insulating frame 1. On the other hand, it will also cause the current of the first cell 4 to flow from the first negative tab 42 through the first busbar 3 to the second positive tab 51 of the second cell 5, meaning the first busbar 3 acts as a conductor. This causes the first busbar 3 to generate heat due to the current, resulting in overheating, which further contributes to the high temperature of the first busbar 3 and significantly affects the insulation performance and deformation of the insulating frame 1.

[0030] Therefore, in this case, the first negative electrode tab 42 of the first battery cell 4 and the second positive electrode tab 51 of the second battery cell 5 are directly stacked and welded together, and are also kept in contact with the first busbar 3. On the one hand, since the first negative electrode tab 42 and the second positive electrode tab 51 are directly connected, the current will not flow directly through the first busbar 3, effectively avoiding the situation where the first busbar 3 becomes a heat source due to the heat generated by the internal resistance caused by the current. On the other hand, the stacking of the first negative electrode tab 42, the second positive electrode tab 51 and the first busbar 3 increases the overall thickness, which indirectly improves the heat absorption capacity of the first busbar 3, thereby solving the problem of deformation or impact on insulation performance of the insulating frame 1 due to overheating of the first busbar 3. The first busbar 3 is a pure copper / purple copper busbar with a channel steel structure, which is evenly connected to the first negative electrode tab 42 and the second positive electrode tab 51. The contact and contact of ear 51 will not form a circuit, and it can also support the first negative electrode ear 42 and the second positive electrode ear 51. It also ensures that the first negative electrode ear 42 and the second positive electrode ear 51 can be bent and bonded more firmly and tightly, and avoids bending deformation or detachment of the first negative electrode ear 42 and the second positive electrode ear 51 due to external force. The pure copper material enables the first busbar 3 to improve its heat absorption capacity, so that when the first busbar 3 absorbs the same unit of heat, the temperature rise will be lower, thereby further reducing the impact of the first busbar 3 overheating. The thickness of the first busbar 3 is 1T~2T, preferably 1.5T or 2T. Increasing the thickness of the first busbar 3 can further improve its heat absorption capacity. When the heat of the heat source is constant, the higher the heat absorption capacity of the first busbar 3, the less heat is conducted to the insulating frame 1.

[0031] In one embodiment of this utility model, the coolant inlet 21 and the coolant outlet 22 extend outward through the sidewall of the insulating frame 1.

[0032] In one embodiment of this utility model, heat-conducting plates 6 are fixedly connected between the first battery cell 4 and the cooling box 2, and between the second battery cell 5 and the cooling box 2. A plurality of heat-conducting pillars 61 are fixedly connected between the upper and lower heat-conducting plates 6, and the heat-conducting pillars 61 penetrate the cooling box 2. Heat from the first busbar 3, the second busbar 7, and the third busbar 8 is transferred to the first battery cell 4 and the second battery cell 5 through the first positive electrode tab 41, the first negative electrode tab 42, the second positive electrode tab 51, and the second negative electrode tab 52. The first battery cell 4 and the second battery cell 5 also generate heat themselves, which is transferred to the heat-conducting pillars 61 through the heat-conducting plates 6. When the cooling plate comes into contact with the heat-conducting pillars 61, it carries away the heat, thereby cooling the battery. This design is intended to accelerate heat transfer.

[0033] In one embodiment of this utility model, a first slot 12 and a second slot 13 are provided on the side wall of the other end of the insulating frame 1; The overheat protection structure of the busbar also includes: The second busbar 7 is inserted into the first slot 12 from the outside of the insulating frame 1 and is connected to the end of the first battery cell 4 that is not connected to the second battery cell 5; The third busbar 8 is inserted into the second slot 13 from the outside of the insulating frame 1 and connected to the end of the second battery cell 5 that is not connected to the first battery cell 4; The first battery cell 4 also has a first positive electrode tab 41 connected to the second busbar 7, and the second battery cell 5 also has a second negative electrode tab 52 connected to the third busbar 8.

[0034] In this application, an insulating frame 1 includes two battery cells, namely a first battery cell 4 and a second battery cell 5. The first battery cell 4 and the second battery cell 5 are connected in series to form a whole through a first negative electrode tab 42, a first busbar 3, and the second battery cell 5. At this time, charging and discharging can be performed externally through the first positive electrode tab 41 and the second negative electrode tab 52. Of course, in the energy storage battery cluster, external connection can also be made through the first positive electrode tab 41 and the second negative electrode tab 52. Since the second busbar 7 and the third busbar 8 are also in contact with the outer shell of the cooling box 2, cooling of the second busbar 7 and the third busbar 8 is also possible.

[0035] In one embodiment of this utility model, a positioning blind hole 14 is provided on the upper end face of the side wall of the insulating frame 1, and a positioning pin 15 is fixedly connected to the lower end face of the side wall of the insulating frame 1, directly below the positioning blind hole 14. A vertically penetrating mounting hole 16 is also provided on the side wall of the insulating frame 1. The energy storage battery cluster includes at least two insulating frames 1. When several insulating frames 1 are installed, the positioning pin 15 on the upper insulating frame 1 is inserted into the positioning blind hole 14 on the lower insulating frame 1 to achieve positioning. At this time, the mounting holes 16 on the several insulating frames are connected, and bolts are passed through the mounting holes 16 and fixed with nuts to achieve installation and fixation.

[0036] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims of this utility model.

Claims

1. A busbar overheat protection structure, characterized in that, include: An insulating frame (1) is provided with an insertion port (11) on the side wall at one end of the insulating frame (1); Cooling box (2), the cooling box (2) is fixedly connected to the inside of the insulating frame (1), and the cooling box (2) is provided with a coolant inlet (21) and a coolant outlet (22) on its periphery; The first busbar (3) has a channel steel structure. The slot of the first busbar (3) faces the cooling box (2) and is inserted from the socket (11) until it is tightly fitted onto the cooling box (2). The first battery cell (4) is fixedly connected to the upper end of the cooling box (2). The first battery cell (4) has a first negative electrode tab (42) connected to the outer wall of the first busbar (3). The second battery cell (5) is fixedly connected to the lower end of the cooling box (2). The second battery cell (5) has a second positive electrode tab (51) connected to the outer wall of the first busbar (3).

2. The busbar overheat protection structure according to claim 1, characterized in that, The first negative electrode tab (42) and the second positive electrode tab (51) both extend along the outer contour of the first busbar (3) until they overlap and are welded together.

3. The busbar overheat protection structure according to claim 2, characterized in that, The coolant inlet (21) and coolant outlet (22) extend outward through the sidewall of the insulating frame (1).

4. The busbar overheat protection structure according to claim 3, characterized in that, A heat-conducting plate (6) is fixedly connected between the first battery cell (4) and the cooling box (2) and between the second battery cell (5) and the cooling box (2). Several heat-conducting columns (61) are fixedly connected between the upper and lower heat-conducting plates (6) and the heat-conducting columns (61) penetrate the cooling box (2).

5. The busbar overheat protection structure according to claim 4, characterized in that, The insulating frame (1) has a first slot (12) and a second slot (13) on the side wall at the other end; The overheat protection structure of the busbar also includes: The second bus (7) is inserted into the first slot (12) from the outside of the insulating frame (1) and connected to the end of the first cell (4) that is not connected to the second cell (5); The third bus (8) is inserted into the second slot (13) from the outside of the insulating frame (1) and connected to the end of the second cell (5) that is not connected to the first cell (4); The first battery cell (4) also has a first positive electrode tab (41) connected to the second busbar (7), and the second battery cell (5) also has a second negative electrode tab (52) connected to the third busbar (8).

6. The busbar overheat protection structure according to claim 1, characterized in that, A positioning blind hole (14) is provided on the upper end face of the side wall of the insulating frame (1), and a positioning pin (15) is fixedly connected to the lower end face of the side wall of the insulating frame (1) and directly below the positioning blind hole (14).

7. The busbar overheat protection structure according to claim 1, characterized in that, The insulating frame (1) also has a through mounting hole (16) on its side wall.

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