Convergence assembly, battery and vehicle

Abstract

The utility model relates to the field of thermal runaway management, and provides a confluence assembly, a battery and a vehicle. The confluence assembly comprises a confluence piece and a thermal switch. The confluence piece is arranged on one side, provided with an anti-explosion valve, of a battery cell of the battery, the thermal switch is mounted on the confluence piece, and the thermal switch and the anti-explosion valve are oppositely arranged; the thermal switch is electrically connected with the control assembly through the confluence piece to form a loop, and the thermal switch is used for disconnecting or closing the loop when a preset temperature is reached. The thermal switch is switched off or switched on in response to the temperature of the battery cell, so that the level signal received by the control assembly changes, thermal runaway detection of the battery is completed through the temperature of the battery cell, and the problem that the reliability of thermal runaway detection of the battery is reduced due to factors such as battery aging and capacity fading is solved; and the stability of thermal runaway detection is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal runaway management, and in particular to a busbar assembly, a battery and a vehicle. Background Art

[0002] With the transformation of the global energy structure and the need for environmental protection, electric vehicles have developed rapidly as a clean and efficient means of transportation. As one of the core components of electric vehicles, the performance of batteries directly affects the vehicle's range, safety and overall cost. However, there are safety hazards such as overheating, overcharging, and internal short circuits during battery operation. These problems may lead to thermal runaway of the battery, causing fire or explosion accidents.

[0003] In the related art, by monitoring the voltage change or current change of the battery during the charging and discharging process, the abnormal behavior of the battery is discovered, and then it is determined whether the battery will experience thermal runaway.

[0004] However, factors such as battery aging and capacity attenuation can easily interfere with voltage and current detection, resulting in low reliability for detecting battery thermal runaway through voltage or current changes. Utility Model Content

[0005] The utility model provides a busbar assembly, a battery and a vehicle, which are used to solve the defect of low reliability in the prior art of detecting thermal runaway of a battery through voltage change or current change.

[0006] On the one hand, the utility model provides a busbar assembly, which is applied to a battery, and the busbar assembly includes a busbar and a thermal switch; wherein the busbar is arranged on a side of the battery cell where an explosion-proof valve is provided, and the thermal switch is installed on the busbar, and the thermal switch is arranged opposite to the explosion-proof valve; the thermal switch is electrically connected to a control assembly through the busbar to form a loop, and the thermal switch is used to open or close the loop when a preset temperature is reached.

[0007] According to a confluence assembly provided by the utility model, a through-opening is arranged at a position of the confluence piece opposite to the explosion-proof valve, and the thermal switch is arranged opposite to the through-opening.

[0008] According to a confluence assembly provided by the utility model, the thermal switch spans across both sides of the through opening.

[0009] According to a confluence assembly provided by the utility model, two ends of the thermal switch are bonded or welded to two sides of the through opening.

[0010] According to a busbar assembly provided by the utility model, the thermal switch includes a first switch;

[0011] The first switch disconnects the circuit when a preset temperature is reached, the number of the first switches is set to at least two, and at least two of the first switches are arranged in series and connected to the control component, and each of the first switches is respectively arranged opposite to the corresponding explosion-proof valve.

[0012] According to a busbar assembly provided by the utility model, the thermal switch includes a second switch;

[0013] The second switch closes the circuit when a preset temperature is reached, the number of the second switches is set to at least two, and at least two of the second switches are arranged in parallel and connected to the control component, and each of the second switches is arranged opposite to the corresponding explosion-proof valve.

[0014] According to a busbar assembly provided by the utility model, the busbar component includes a flexible circuit board or a busbar.

[0015] On the other hand, the utility model further provides a battery, comprising a battery cell and the above-mentioned busbar assembly.

[0016] According to a battery provided by the utility model, the control component is connected to the output switch of the battery, and the control component is used to control the on and off of the output switch.

[0017] On the other hand, the utility model also provides a vehicle, wherein the vehicle comprises the battery as described above.

[0018] The utility model provides a busbar assembly, which forms a loop by placing a thermal switch opposite to the explosion-proof valve of the battery cell, and electrically connecting the thermal switch to the control assembly through the busbar. The thermal switch can open or close the loop when a preset temperature is reached. When thermal runaway occurs in the battery cell, the heat emitted from the explosion-proof valve heats the thermal switch, so that the thermal switch is heated to the preset temperature and closed or opened, thereby causing the level signal received by the control assembly from the loop to change, thereby enabling the control assembly to detect that the battery cell is in a thermal runaway state.

[0019] With such an arrangement, in the busbar assembly provided by the utility model, the thermal switch is opened or closed in response to the temperature of the battery cell, causing the level signal received by the control assembly to change, thereby completing the thermal runaway detection of the battery through the temperature of the battery cell, solving the problem of reduced reliability in detecting thermal runaway of the battery due to factors such as battery aging and capacity attenuation, and making the thermal runaway detection more stable.

[0020] The battery and the vehicle provided by the utility model, because they include the busbar assembly provided by the utility model, also include all the above advantages of the busbar assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the principle of the battery provided by the embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the structure of a battery provided by an embodiment of the utility model;

[0024] Figure 3 It is a three-dimensional structural schematic diagram of a battery provided in an embodiment of the utility model.

[0025] Reference numerals:

[0026] 1. Thermal switch; 2. Power supply; 3. Control component; 301. First pin; 302. Second pin; 4. Explosion-proof valve; 5. Battery cell; 6. Busbar; 7. Output switch; 8. Warning device; 9. Power supply device. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Combine the following Figure 1-Figure 3 The confluence assembly provided in the embodiment of the utility model is described.

[0029] Specifically, the busbar assembly is applied to a battery and includes a busbar 6 and a thermal switch 1 .

[0030] The busbar 6 is arranged on the side of the battery cell 5 where the explosion-proof valve 4 is arranged, the thermal switch 1 is installed on the busbar 6, and the thermal switch 1 is arranged opposite to the explosion-proof valve 4 so that the temperature emitted by the explosion-proof valve can be transferred to the thermal switch 1.

[0031] The thermal switch 1 is electrically connected to the control assembly 3 via the busbar 6 to form a loop. The thermal switch 1 is used to open or close the loop when a preset temperature is reached.

[0032] Specifically, the thermal switch 1 can be set to a normally closed structure. When the temperature does not reach the preset temperature, the thermal switch 1 is closed and the control component 3 receives a level signal. When the temperature reaches the preset temperature, the thermal switch 1 is disconnected and the control component 3 does not receive a level signal.

[0033] Alternatively, the thermal switch 1 can also be set to a normally open structure. When the temperature does not reach the preset temperature, the thermal switch 1 is disconnected and the control component 3 does not receive a level signal. When the temperature reaches the preset temperature, the thermal switch 1 is closed and the control component 3 receives a level signal.

[0034] The busbar assembly provided in the embodiment of the utility model forms a loop by placing the thermal switch 1 opposite to the explosion-proof valve of the battery cell 5, and the thermal switch 1 is electrically connected to the control component 3 through the busbar 6. The thermal switch 1 can open or close the loop when the preset temperature is reached. When the battery cell 5 has thermal runaway, the heat emitted from the explosion-proof valve heats the thermal switch 1, so that the thermal switch 1 is heated to the preset temperature and closed or opened, thereby causing the level signal received by the control component 3 from the loop to change, thereby enabling the control component 3 to detect that the battery cell is in a thermal runaway state.

[0035] With such an arrangement, in the busbar assembly provided in the embodiment of the utility model, the thermal switch 1 is opened or closed in response to the temperature of the battery cell 5, so that the level signal received by the control assembly 3 changes, thereby completing the thermal runaway detection of the battery through the temperature of the battery cell 5, solving the problem of reduced reliability in detecting thermal runaway of the battery due to factors such as battery aging and capacity attenuation, and making the thermal runaway detection more stable.

[0036] Since heat is concentrated in the explosion-proof valve 4 when thermal runaway occurs in the battery, the temperature of the explosion-proof valve 4 is relatively high. In this embodiment, the thermal switch 1 is arranged on the explosion-proof valve 4 to ensure that the heat released can heat the thermal switch 1 to a preset temperature immediately after thermal runaway occurs in the battery, thereby improving the accuracy and reliability of thermal runaway detection of the battery.

[0037] In addition, by integrating the thermal switch 1 on the busbar 6, the space of the busbar 6 can be fully utilized, thus saving the space inside the battery and improving the energy density of the battery.

[0038] Optionally, the control component 3 includes a first pin 301 and a second pin 302. In use, the first pin 301 is electrically connected to one end of the power supply 2, and the second pin 302 is electrically connected to the other end of the power supply 2 through the thermal switch 1. The thermal switch 1 is opened or closed, so that the level signal between the first pin 301 and the second pin 302 changes. It should be noted that the control component 3 can be powered by a power supply device 9 independent of the power supply 2.

[0039] In some embodiments provided by the utility model, a through hole is provided at a position where the busbar 6 is opposite to the explosion-proof valve 4, and the thermal switch 1 is provided opposite to the through hole. By providing the through hole on the busbar 6, and the thermal switch 1 being provided opposite to the through hole, the heat ejected by the explosion-proof valve can directly act on the thermal switch 1 through the through hole, ensuring that the released heat can heat the thermal switch 1 to a preset temperature immediately after the thermal runaway of the battery occurs, thereby improving the accuracy and reliability of the thermal runaway detection of the battery.

[0040] In some embodiments provided by the present invention, the thermal switch 1 spans across both sides of the through hole. In this way, both ends of the thermal switch are supported evenly, making the thermal switch more stable.

[0041] In some embodiments provided by the utility model, the two ends of the thermal switch are bonded or welded to the two sides of the through hole. In this way, the connection structure of the thermal switch is simple and easy to manufacture.

[0042] In some embodiments provided by the present invention, the thermal switch 1 includes a first switch.

[0043] The first switch disconnects the circuit when the preset temperature is reached, the number of first switches is set to at least two, and at least two first switches are arranged in series and connected to the control component 3, and each first switch is arranged opposite to the corresponding explosion-proof valve.

[0044] In this way, by means of at least two first switches connected in series, the thermal runaway state of at least two battery cells 5 can be detected simultaneously, thereby improving the detection capability of thermal runaway of the battery. At the same time, the at least two first switches connected in series share the control component 3 and the power source 2, making the battery structure simple and compact. Figure 2 As shown, by arranging the first switches in series, it is convenient to lay out the lines of the first switches.

[0045] Optionally, the first switch is configured as a bimetallic thermal protection switch, which uses the difference in expansion coefficients of the two layers of metal in the bimetallic strip to bend after being heated. When the temperature reaches a preset temperature, the bending deformation is sufficient to disconnect the switch contacts. Alternatively, the first switch can also be configured as a thermal fuse or a positive temperature coefficient thermistor switch.

[0046] In some embodiments provided by the present invention, the thermal switch 1 includes a second switch.

[0047] The second switch closes the circuit when the preset temperature is reached, the number of the second switches is set to at least two, and at least two second switches are arranged in parallel and connected to the control component 3, and each second switch is arranged opposite to the corresponding explosion-proof valve.

[0048] With such an arrangement, the thermal runaway state of at least two battery cells 5 can be detected simultaneously by at least two second switches arranged in parallel, thereby improving the detection capability of thermal runaway of the battery. At the same time, at least two second switches arranged in parallel share the control component 3 and the power supply 2, making the structure of the battery simple and compact.

[0049] Optionally, the second switch is configured as a bimetallic thermal protection switch, which uses the difference in expansion coefficients of the two layers of metal in the bimetallic strip to bend after being heated. When the temperature reaches a preset temperature, the bending deformation is sufficient to close the switch contacts. Alternatively, the second switch can also be configured as a semiconductor thermal switch or a memory alloy switch.

[0050] In some embodiments provided by the present invention, the busbar is configured as a metal busbar or a flexible circuit board, wherein the flexible circuit board can be used to sample the voltage of the battery cell or transmit current, and the metal busbar is used to transmit current to the battery cell.

[0051] A battery is also provided in an embodiment of the utility model.

[0052] Specifically, the battery includes a battery cell, a control component and the busbar component as described above.

[0053] It should be noted that the vehicle includes a battery and also includes all the above advantages of the battery, which will not be repeated here. Optionally, the control component can be a battery management system.

[0054] In some embodiments provided by the present utility model, the control component 3 is connected to the output switch 7 of the battery, for example, the output switch 7 is connected to the corresponding output pin of the control component 3. The control component 3 is used to control the on and off of the output switch 7, for example, the control component 3 outputs a corresponding level signal through the output pin to control the on and off of the output switch 7. Specifically, when the level signal between the first pin 301 and the second pin 302 of the control component 3 changes, it indicates that the battery has thermal runaway, and the control component 3 controls the output switch 7 to disconnect, that is, cuts off the output of the battery, thereby reducing the spread of thermal runaway. Optionally, the output switch 7 is a relay.

[0055] A vehicle is also provided in an embodiment of the utility model.

[0056] Specifically, the vehicle includes a battery as described above.

[0057] It should be noted that the vehicle includes a battery and also includes all the above-mentioned advantages of the battery, which will not be elaborated here.

[0058] In some embodiments provided by the present utility model, the vehicle further includes a warning device 8. The control component 3 is connected to the warning device 8, for example, the warning device 8 is connected to the corresponding output pin of the control component 3. The control component 3 is used to control the warning device 8 to alarm, for example, the control component 3 outputs a corresponding level signal through the output pin to control the warning device 8 to alarm. Specifically, when the level signal between the first pin 301 and the second pin 302 of the control component 3 changes, it indicates that the battery has thermal runaway, and the control component 3 controls the warning device 8 to alarm to draw the attention of the operator to handle it in time or stay away.

[0059] Optionally, the warning device 8 includes a warning light or a speaker. Further, the warning device 8 is configured as an audible and visual alarm.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A busbar assembly, characterized in that: Applied to a battery, the busbar assembly comprises a busbar and a thermal switch; Wherein, the current collector is arranged on a side of the battery cell of the battery where the explosion-proof valve is arranged, the thermal switch is installed on the current collector, and the thermal switch is arranged opposite to the explosion-proof valve; The thermal switch is electrically connected to the control component through the busbar to form a loop, and the thermal switch is used to open the loop or close the loop when a preset temperature is reached.

2. The busbar assembly according to claim 1, characterized in that: A through hole is arranged at a position of the manifold opposite to the explosion-proof valve, and the thermal switch is arranged opposite to the through hole.

3. The busbar assembly according to claim 2, characterized in that: The thermal switch spans across both sides of the through opening.

4. The busbar assembly according to claim 3, characterized in that: The two ends of the thermal switch are bonded or welded to the two sides of the through opening.

5. The busbar assembly according to any one of claims 1 to 4, characterized in that: The thermal switch includes a first switch; The first switch disconnects the circuit when a preset temperature is reached, the number of the first switches is set to at least two, and at least two of the first switches are arranged in series and connected to the control component, and each of the first switches is respectively arranged opposite to the corresponding explosion-proof valve.

6. The busbar assembly according to any one of claims 1 to 4, characterized in that: The thermal switch includes a second switch; The second switch closes the circuit when a preset temperature is reached, the number of the second switches is set to at least two, and at least two of the second switches are arranged in parallel and connected to the control component, and each of the second switches is arranged opposite to the corresponding explosion-proof valve.

7. The busbar assembly according to any one of claims 1 to 4, characterized in that: The busbar includes a flexible printed circuit board or a busbar.

8. A battery, characterized in that: It comprises a battery cell, a control component and a busbar component as described in any one of claims 1 to 7.

9. The battery according to claim 8, characterized in that The control component is connected to the output switch of the battery, and the control component is used to control the on and off of the output switch.

10. A vehicle, characterized in that: The vehicle comprises a battery as claimed in claim 8 or 9.

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