Battery pack thermal runaway protection device, power battery system and electric equipment

Abstract

The utility model discloses a battery pack thermal runaway protection device, a power battery system and electric equipment. The battery pack thermal runaway protection device comprises a current device, a control module and at least one connection switch module. The current device surrounds the inner side wall of the battery pack box body and is fixedly connected with the battery pack box body; the battery packs in the battery pack box body are connected through the connection switch module; the input end and the output end of the current device are connected to the control module; the control module is also connected with the connection switch module; the control module and the current device form a detection element; the control module is used for generating a detection signal, receiving the detection signal and generating a control signal when the detection signal in the detection element is interrupted; and the connection switch module is used for cutting off the electric connection among the battery packs according to the control signal. According to the embodiment of the utility model, the connection among the battery packs in the battery pack box body can be cut off when collision occurs, so that the thermal runaway spreading of the battery packs is prevented, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack thermal runaway protection device, a power battery system and electrical equipment. Background Art

[0002] As electric vehicle sales and ownership increase, the collision safety of electric vehicle power batteries, as core components, has become a major concern for consumers. Currently, the most common approach in the industry to ensure collision safety is through structural reinforcement.

[0003] However, when a battery pack collides and thermal runaway occurs, the thermal runaway within the battery pack is prone to spread, and the safety of the battery pack is low. Utility Model Content

[0004] The utility model provides a battery pack thermal runaway protection device, a power battery system and electrical equipment, so as to prevent the thermal runaway of the battery pack from spreading and improve safety.

[0005] According to one aspect of the present invention, a battery pack thermal runaway protection device is provided, the battery pack thermal runaway protection device comprising:

[0006] A current device, the current device is fixedly connected around the inner wall of the battery pack body;

[0007] at least one connection switch module, through which the battery packs in the battery pack case are connected;

[0008] A control module, the input and output ends of the current device are both connected to the control module; the control module is also connected to the connection switch module; the control module and the current device constitute a detection element;

[0009] The control module is used to generate and receive detection signals, and to generate a control signal when the detection signal in the detection element is interrupted; the connection switch module is used to cut off the electrical connection between the battery packs according to the control signal.

[0010] Optionally, the current device comprises: at least one metal conductor, at least one insulating layer and two connectors;

[0011] The metal conductor is connected between the two connectors; the insulating layer is coated on the metal conductor; and the metal conductor corresponds to the insulating layer one by one.

[0012] Optionally, a plurality of notches are provided on the metal conductor; and the notches are spaced apart from each other.

[0013] Optionally, the metal conductor is a nickel wire or an aluminum wire.

[0014] Optionally, the connection switch module includes: a connection relay and two connection bars;

[0015] The input end of the connecting relay is connected to the first battery pack through the first connecting bar; the output end of the connecting relay is connected to the second battery pack through the second connecting bar; and the control end of the connecting relay is connected to the control module;

[0016] The connection bar is used to connect the connection relay and the battery pack; the connection relay is used to cut off the connection between the battery packs according to the control signal.

[0017] Optionally, the control module includes: a signal generating unit, a signal receiving unit and a control unit;

[0018] The signal generating unit and the signal receiving unit are both connected to the control unit;

[0019] The signal generating unit is used to generate the detection signal and send the detection signal; the signal receiving unit is used to receive the detection signal; and the control unit is used to generate a control signal when the detection signal in the detection element is interrupted.

[0020] Optionally, the current device and the battery pack body are fixed by bonding or riveting.

[0021] According to another aspect of the present invention, a power battery system is provided, comprising the battery pack thermal runaway protection device, the battery pack case, the battery protection device, and the battery pack according to any of the above embodiments;

[0022] The battery protection device is arranged in the battery pack case, and the total positive pole and the total negative pole of the battery pack are electrically connected to the battery protection device; the battery protection device is also connected to the control module of the battery pack thermal runaway protection device; the battery protection device is used to cut off the electrical connection between the battery pack and the external load according to the control signal sent by the control module of the battery pack thermal runaway protection device.

[0023] Optionally, the battery protection device includes: a total positive relay and a total negative relay;

[0024] The total positive relay is connected to the total positive pole of the battery pack; the total negative relay is connected to the total negative pole of the battery pack;

[0025] The main positive relay and the main negative relay are used to cut off the connection between the battery pack and the external load.

[0026] According to another aspect of the present invention, an electric device is provided, which includes the power battery system described in any of the above embodiments.

[0027] This utility model connects a control module and a current device to form a detection element. The detection element is arranged around the battery pack inside the battery pack case. The control module determines whether the battery pack inside the battery pack case is at risk of thermal runaway by detecting changes in the detection signal from the detection element. Specifically, the control module generates a control signal when the detection signal from the detection element is interrupted. The switch module receives the control signal and, based on the control signal, disconnects the battery packs from each other to prevent the spread of thermal runaway within the battery pack case. This utility model can control the disconnection between the battery packs inside the battery pack case in the event of a collision, thereby preventing the spread of thermal runaway and improving safety.

[0028] The power battery system and electrical equipment provided by the present invention both include the above-mentioned battery pack thermal runaway protection device. The power battery system and electrical equipment can also control the disconnection between the battery packs in the battery pack box in the event of a collision to prevent the thermal runaway of the battery pack from spreading and improve safety.

[0029] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only 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.

[0031] Figure 1 This is a schematic diagram of a battery pack thermal runaway protection device provided by the first embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of a current device provided in Example 2 of the present utility model;

[0033] Figure 3 This is a partially enlarged schematic diagram of a current device provided in the second embodiment of the present utility model;

[0034] Figure 4 This is a schematic diagram of a connection switch module provided in the third embodiment of the present utility model;

[0035] Figure 5This is a schematic structural diagram of a battery pack thermal runaway protection device provided in the fourth embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of a power battery system provided in Example 5 of the present utility model.

[0037] Figure ID

[0038] Current device 110, metal conductor 111, insulation layer 112, connector 113, connection switch module 120, connection relay 121, connection bar 122, control module 130, signal generating unit 131, signal receiving unit 132, control unit 133, battery pack case 210, battery pack 310, battery protection device 410 DETAILED DESCRIPTION

[0039] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] Example 1

[0042] Figure 1 This is a schematic diagram of a battery pack thermal runaway protection device provided by the first embodiment of the present invention. The battery pack thermal runaway protection device can control the disconnection between the battery packs in the battery pack box in the event of a collision to prevent the thermal runaway of the battery pack from spreading and improve safety. Figure 1 The battery pack thermal runaway protection device includes: a current device 110, a control module 130 and at least one connection switch module 120.

[0043] The current device 110 is fixed on the inner wall of the battery pack case 210, and the inner wall 211 of the battery pack case 210 is arranged around the edge of the bottom plate 212 of the battery pack case 210; the inner wall 211 of the battery pack case 210 is perpendicular to the bottom plate 212 of the battery pack case 210; the battery groups in the battery pack case 210 are connected through the connecting switch module 120; wherein, multiple battery groups are arranged in the battery pack case 210; the input and output ends of the current device 110 are both connected to the control module 130; the control module 130 is also connected to the connecting switch module 120; the control module 130 and the current device 110 constitute a detection element; the control module 130 is used to generate a detection signal, and to generate a control signal when the detection signal in the detection element is interrupted; the connecting switch module 120 is used to cut off the connection between the battery groups according to the control signal.

[0044] Specifically, the current device 110 and the control module 130 constitute a closed detection element, and the shape of the detection element can be rectangular or circular, which is not limited in this embodiment. Each battery pack is arranged in the closed shape formed by the current device 110 and the control module 130. The current device 110 obtains the detection signal generated by the control module 130 through its input end and outputs the detection signal through its output end. The control module 130 obtains the detection signal output by the output end of the current device 110. The control module 130 detects thermal runaway of the battery pack through changes in the detection signal in the current device 110.

[0045] Because the current device 110 and the control module 130 form a closed pattern surrounding each battery pack, when the battery pack case 210 is impacted and deformed, the battery pack case 210 squeezes the current device 110. The current device 110 is squeezed by the battery pack case 210 and breaks. For example, the current device 110 and the battery pack case 210 can be fixed by bonding or riveting.

[0046] When the control module 130 continuously receives the detection signal output by the current device 110, the battery pack housing 210 has not been impacted, and the battery packs within the battery pack housing 210 are not at risk of thermal runaway. If the control module 130 loses the detection signal output by the current device 110, it indicates that the current device 110 has broken, the battery pack housing 210 has been impacted, and the battery packs within the battery pack housing 210 are at risk of thermal runaway. In this case, the control module 130 generates a control signal. The connection switch module 120 receives the control signal and, in response to the control signal, disconnects the battery packs. It should be noted that the battery packs are interconnected via the connection switch module 120. The battery packs can be connected in series or in parallel. When the connections between the battery packs within the battery pack housing 210 are disconnected, the energy of each battery pack within the battery pack housing 210 is separated, resulting in a relatively small energy content within each individual battery pack and a correspondingly reduced risk of thermal runaway.

[0047] In this embodiment of the utility model, a control module 130 and a current device 110 are connected to form a detection element. The detection element is arranged around the battery pack within the battery pack case 210. The control module 130 determines whether the battery pack within the battery pack case 210 is at risk of thermal runaway by detecting changes in the detection signal in the detection element. Specifically, the control module 130 generates a control signal when the detection signal in the detection element is interrupted, connects to the switch module 120 to obtain the control signal, and disconnects the battery packs based on the control signal to prevent the spread of thermal runaway within the battery pack case 210. This embodiment of the utility model can control the disconnection between the battery packs within the battery pack case in the event of a collision, thereby preventing the spread of thermal runaway of the battery pack and improving safety.

[0048] Example 2

[0049] Figure 2 This is a schematic diagram of a current device provided in Example 2 of the present utility model. Figure 3 This is a partially enlarged schematic diagram of a current device provided by the second embodiment of the present invention. This embodiment is based on the first embodiment, and optionally, Figure 2 and Figure 3 The current device 110 includes: at least one metal conductor 111 , at least one insulating layer 112 and two connectors 113 .

[0050] The metal conductor 111 is connected between the two connectors 113 ; the insulating layer 112 covers the metal conductor 111 ; the metal conductor 111 and the insulating layer 112 correspond one to one.

[0051] Specifically, due to the influence of various factors such as the angle and force of the impact on the battery pack case 210, the area of the deformed portion and the degree of deformation of the battery pack case 210 are difficult to predict. Therefore, multiple metal conductors 111 are arranged around the battery pack, and the metal conductors 111 are arranged at intervals. Since the battery pack itself has a certain height, multiple metal conductors 111 are arranged around the battery pack to expand the area where the battery pack case 210 impact is detected, thereby improving the sensitivity of thermal runaway protection. Among them, the multiple metal conductors 111 in the current device 110 are used to transmit detection signals, and each metal conductor 111 in the current device 110 has a detection signal transmitted. When one or more metal conductors 111 in the current device 110 are broken, that is, when the detection signal transmission in one or more metal conductors 111 in the current device 110 is interrupted, the control module 130 generates a control signal. In other words, when the control module 130 detects that the detection signal in one or more metal conductors 111 in the current device 110 is interrupted, the control module 130 generates a control signal. The connection switch module 120 obtains a control signal and cuts off the connection between the battery packs according to the control signal.

[0052] Optionally, a plurality of notches are provided on the metal conductor 111; each notch is spaced apart. Specifically, the notch on the metal conductor 111 is the weak point of the metal conductor 111, and the strength of the weak point of the metal conductor 111 is lower than the strength of other parts of the metal conductor 111. When the battery pack case 210 is impacted and squeezes the metal conductor 111, the weak point of the metal conductor 111 is more likely to break, thereby reducing the effect of the ductility of the material of the metal conductor 111 itself on thermal runaway protection. It should be noted that the metal conductor 111 can be a nickel wire, an aluminum wire, or an alloy. In actual application, the material of the metal conductor 111 can be set according to actual conditions, and this embodiment does not impose any restrictions on this.

[0053] Example 3

[0054] Figure 4 This is a schematic diagram of a connection switch module provided by the third embodiment of the present invention. Based on the above embodiments, optionally, refer to Figure 4 The connection switch module 120 includes a connection relay 121 and two connection bars 122. The battery pack box 210 includes at least two battery packs 310.

[0055] The input end of the connecting relay 121 is connected to the first battery pack 310 through the first connecting row 122; the output end of the connecting relay 121 is connected to the second battery pack 310 through the second connecting row 122; the control end of the connecting relay 122 is connected to the control module 130; the connecting row 122 is used to connect the battery pack 310 and the connecting relay 121; the connecting relay 121 is used to cut off the connection between each battery pack 310 according to the control signal.

[0056] Figure 4 The structure of the battery packs 310 connected in series within the battery pack housing 210 is shown as an example. Taking two battery packs 310 within the battery pack housing 210 as an example, the input of the connecting relay 121 is connected to the positive electrode of the first battery pack 310, and the output of the connecting relay 121 is connected to the negative electrode of the second battery pack 310, thereby connecting the first battery pack 310 and the second battery pack 310 in series. For example, the material of the connecting bar 122 can be copper or aluminum. In actual applications, the material of the connecting bar 122 can be set according to actual needs, and this embodiment does not impose any restrictions on this.

[0057] Optionally, in actual applications, the battery packs 310 within the battery pack case 210 may be connected in parallel. When the battery packs 310 within the battery pack case 210 are connected in parallel, at least two connection switch modules 120 are provided within the battery pack case 310. Again, taking the example of two battery packs 310 within the battery pack case 210, the positive electrode of the first battery pack 310 is connected to the positive electrode of the second battery pack 310 via the first connection switch module 120, and the negative electrode of the first battery pack 310 is connected to the negative electrode of the second battery pack 310 via the second connection switch module 120.

[0058] Example 4

[0059] Figure 5 This is a schematic diagram of the structure of a battery pack thermal runaway protection device provided by the fourth embodiment of the present invention. Based on the above embodiments, optionally, refer to Figure 5 The control module 130 includes: a signal generating unit 131, a signal receiving unit 132 and a control unit 133.

[0060] The signal generating unit 131 and the signal receiving unit 132 are both connected to the control unit 133; the signal generating unit 131 is used to generate a detection signal and send a detection signal; the signal receiving unit 132 is used to receive a detection signal; and the control unit 133 is used to generate a control signal when the detection signal in the detection element is interrupted.

[0061] Specifically, the signal generating unit 131 continuously generates a detection signal and sends the detection signal to the detection element. The signal receiving unit 132 continuously obtains the detection signal from the detection element. The control module 133 determines whether the detection signal in the detection element is interrupted based on whether the signal receiving unit 132 receives the detection signal in the detection element, and generates a control signal when the detection signal in the detection element is interrupted. The control unit 133 can be an independent control device or a non-independent control device. When the control unit 133 is a non-independent control device, the control unit 133 can be, for example, a battery management system.

[0062] Example 5

[0063] An embodiment of the present utility model provides a power battery system. Figure 6 This is a schematic diagram of a power battery system provided by the fifth embodiment of the present invention. Figure 6 The power battery system 10 includes the battery pack thermal runaway protection device provided in any of the above embodiments, a battery pack box 210, a battery protection device 410 and a battery pack 310.

[0064] The battery protection device 410 is arranged in the battery pack case 210, and the total positive pole and the total negative pole of the battery pack 310 are electrically connected to the battery protection device 410; the battery protection device 410 is also connected to the control module 130 of the battery pack thermal runaway protection device; the battery protection device 410 is used to cut off the electrical connection between the battery pack 310 and the load according to the control signal sent by the control module 130 of the battery pack thermal runaway protection device.

[0065] Specifically, when the control module 130 of the battery pack thermal runaway protection device determines that the battery pack 310 within the battery pack housing 210 is at risk of thermal runaway, the control module 130 generates a control signal, which is then received by both the battery protection device 410 and the connection switch module 120. Based on the control signal, the battery protection device 410 disconnects the battery pack from the load to prevent thermal runaway of the battery pack 310 in the battery string from impacting and damaging the load.

[0066] Among them, the power battery system 10 provided in the embodiment of the present invention has the beneficial effects of the battery pack thermal runaway protection device provided in any of the above embodiments, which will not be repeated here.

[0067] Optionally, the battery protection device 410 includes: a main positive relay and a main negative relay.

[0068] The total positive relay is connected to the total positive pole of the battery pack; the total negative relay is connected to the total negative pole of the battery pack; the total positive relay and the total negative relay are used to cut off the connection between the battery pack and the external load. Specifically, the battery pack is connected to the load through the total positive relay and the total negative relay. When the battery pack 310 in the battery pack box 210 is at risk of thermal runaway, the total positive relay and the total negative relay obtain the control signal and cut off the connection between the battery pack and the load according to the control signal. At this time, the total positive and total negative poles of the battery pack are disconnected from the load to prevent the battery pack 310 in the battery string from thermal runaway and causing impact and damage to the load.

[0069] Example 6

[0070] The present invention provides an electrical device. The electrical device includes the power battery system provided by any of the above embodiments. The electrical device provided by the present invention has the beneficial effects of the power battery system provided by any of the above embodiments, which will not be further elaborated here.

[0071] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this utility model can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this utility model can be achieved. This is not limited herein.

[0072] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A battery pack thermal runaway protection device, characterized in that: include: A current device, the current device is fixedly connected around the inner wall of the battery pack body; at least one connection switch module, through which the battery packs in the battery pack case are connected; A control module, the input and output ends of the current device are both connected to the control module; the control module is also connected to the connection switch module; the control module and the current device constitute a detection element; The control module is used to generate and receive detection signals, and to generate a control signal when the detection signal in the detection element is interrupted; the connection switch module is used to cut off the electrical connection between the battery packs according to the control signal.

2. The battery pack thermal runaway protection device according to claim 1, characterized in that: The current device comprises: at least one metal conductor, at least one insulating layer and two connectors; The metal conductor is connected between the two connectors; the insulating layer is coated on the metal conductor; and the metal conductor corresponds to the insulating layer one by one.

3. The battery pack thermal runaway protection device according to claim 2, characterized in that: The metal conductor is provided with a plurality of notches, and the notches are spaced apart from each other.

4. The battery pack thermal runaway protection device according to claim 2, characterized in that: The metal conductor is a nickel wire or an aluminum wire.

5. The battery pack thermal runaway protection device according to claim 1, characterized in that: The connection switch module includes: a connection relay and two connection bars; The input end of the connecting relay is connected to the first battery pack through the first connecting bar; the output end of the connecting relay is connected to the second battery pack through the second connecting bar; and the control end of the connecting relay is connected to the control module; The connection bar is used to connect the connection relay and the battery pack; the connection relay is used to cut off the connection between the battery packs according to the control signal.

6. The battery pack thermal runaway protection device according to claim 1, characterized in that: The control module includes: a signal generating unit, a signal receiving unit and a control unit; The signal generating unit and the signal receiving unit are both connected to the control unit; The signal generating unit is used to generate the detection signal and send the detection signal; the signal receiving unit is used to receive the detection signal; and the control unit is used to generate a control signal when the detection signal in the detection element is interrupted.

7. The battery pack thermal runaway protection device according to any one of claims 1 to 6, characterized in that: The current device and the battery pack body are fixed together by bonding or riveting.

8. A power battery system, characterized in that: Comprising the battery pack thermal runaway protection device, battery pack box, battery protection device and battery pack according to any one of claims 1 to 7; The battery protection device is arranged in the battery pack case, and the total positive pole and the total negative pole of the battery pack are electrically connected to the battery protection device; the battery protection device is also connected to the control module of the battery pack thermal runaway protection device; the battery protection device is used to cut off the electrical connection between the battery pack and the external load according to the control signal sent by the control module of the battery pack thermal runaway protection device.

9. The power battery system according to claim 8, characterized in that: The battery protection device includes: a total positive relay and a total negative relay; The total positive relay is connected to the total positive pole of the battery pack; the total negative relay is connected to the total negative pole of the battery pack; The main positive relay and the main negative relay are used to cut off the connection between the battery pack and the external load.

10. An electrical device, characterized in that: Comprising a power battery system as described in any one of claims 8-9.

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