Thermal runaway protection device, battery system and electric ship

Abstract

According to the thermal runaway protection device, the battery system and the electric ship, an exhaust valve is made of a conductive material, so that after the exhaust valve is installed on an exhaust hole of a battery shell, the battery shell, the exhaust valve, a control circuit and a power supply can form a loop, and the control circuit is powered on, so that the control circuit is coupled with an output circuit; when the battery pack normally discharges, if a single battery in the battery pack is subjected to thermal runaway, thermal runaway gas rushes through the exhaust valve on the battery shell, the exhaust valve is separated from the battery shell and is not in contact with the battery shell, the control circuit is powered off, and the output circuit is powered off, so that the battery pack does not carry a load for use any more; therefore, the load can be disconnected immediately after thermal runaway of the single battery, so that the accident risk is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a thermal runaway protection device, a battery system and an electric ship. BACKGROUND

[0002] With the application of lithium batteries in various power fields, the safety control of the battery also needs to be gradually improved. In the field of large vehicle and ship power or energy storage, the lithium battery system usually has a large energy. In order to ensure that the system can effectively respond and protect in the event of an emergency, the system generally needs to add an automatic control mode.

[0003] On the battery pack level, a pressure relief valve, a fuse and a manual maintenance switch are generally provided. The pressure relief valve is used to timely and directional exhaust when high pressure gas is generated inside the thermal runaway. The fuse is used to quickly melt and cut off the circuit when the current is large. The manual maintenance switch is used to cut off the circuit in advance to ensure electrical safety when the personnel manually operates. However, these need to be detected by arranging a plurality of temperature sensors in the battery pack shell.

[0004] However, after the thermal runaway occurs in the battery pack, the heat needs to be conducted through the heat conduction of the battery itself. However, the temperature sensor may not detect the high temperature anomaly in the first time due to the arrangement position, and the BMS thermal runaway related safety strategy is not triggered. This situation will cause the battery pack to continue to carry the load in the abnormal state, and expand the accident risk. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a thermal runaway protection device, a battery system and an electric ship, which can disconnect the load in the first time after the thermal runaway of the battery monomer, thereby effectively reducing the accident risk.

[0006] The embodiments of the present application can be implemented as follows:

[0007] In a first aspect, the utility model provides a thermal runaway protection device, including control circuit and exhaust valve, the exhaust valve is used for setting in the exhaust hole of battery shell, the exhaust valve is conductive material, the control circuit is used for electric connection power supply and the exhaust valve, and is coupled with the output circuit of battery pack, in the case where the exhaust valve is hit open by the thermal runaway gas inside the battery shell, the control circuit can be powered off, so that the output circuit of battery pack is powered off.

[0008] In an optional implementation, the thermal runaway protection device further includes a relay, the input side of the relay is connected in series with the control circuit, and the output side of the relay is connected in series with the output circuit. In the case where the exhaust valve is hit open by the thermal runaway gas inside the battery shell, the output side of the relay is disconnected to make the output circuit powered off.

[0009] In an optional embodiment, the exhaust valve is sealingly connected to the exhaust hole, and a contact sheet made of conductive material is connected to the outer surface of the battery shell and is pressed against the exhaust valve.

[0010] In an optional embodiment, the contact sheet is annular and surrounds the outer periphery of the exhaust hole.

[0011] In an optional embodiment, the contact sheet comprises a connecting portion for connecting the battery shell and a contact portion for pressing against the exhaust valve.

[0012] In an optional embodiment, the outer surface of the battery shell further comprises an upper cover plate and a compression spring, and the compression spring abuts between the exhaust valve and the upper cover plate.

[0013] In a second aspect, the utility model provides a battery system, including battery pack and the heat run away protection device of any preceding embodiment, the battery pack has output circuit, shell and fixed in the battery monomer of shell, there is the exhaust valve in the exhaust hole on the battery shell of battery monomer, the output circuit is coupled with the control circuit, and the positive pole of battery monomer is electrically connected with the output circuit through the positive pole end plate.

[0014] In an optional embodiment, the battery shell is welded to the shell to share a ground wire.

[0015] In an optional embodiment, a sealing ring is arranged between the exhaust valve and the exhaust hole.

[0016] In a third aspect, the utility model provides an electric ship, including the battery system of any preceding embodiment.

[0017] The beneficial effects of the embodiments of the present application include, for example:

[0018] The exhaust valve is made of conductive material, so that after the exhaust valve is installed on the exhaust hole of the battery shell, the battery shell, the exhaust valve, the control circuit and the power supply can form a loop, the control circuit is powered on to couple the control circuit with the output circuit, the battery pack is normally discharged, if a battery monomer in the battery pack experiences thermal runaway, the thermal runaway gas will rush open the exhaust valve on the battery shell, the exhaust valve and the battery shell are separated and not in contact, so that the control circuit is powered off, and the output circuit is also powered off, so that the battery pack is no longer used to carry the load, so that the load can be disconnected in the first time after the thermal runaway of the battery monomer, thereby effectively reducing the risk of accidents. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 The structural schematic diagram of the battery system in the embodiments of the present application is shown.

[0021] Figure: 10-battery shell; 11-exhaust hole; 12-contact sheet; 121-connection part; 122-contact part; 13-upper cover plate; 14-ground wire; 15-compression spring; 20-exhaust valve; 21-sealing ring; 30-control circuit; 31-power supply; 40-output circuit; 41-positive electrode end plate; 42-positive electrode interface; 50-relay; 51-input side; 52-output side. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] It should be noted that: similar labels and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship commonly used when the product of the present application is used, and are merely intended to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following examples and features in the examples can be combined with each other without conflict.

[0029] The battery system disclosed in the embodiments of the present application can be used in battery replacement ships or other electrically driven vehicles, such as vehicles, etc.

[0030] Reference Figure 1 The battery system includes a battery pack and a thermal runaway protection device, the battery pack has an output circuit 40, a shell and a plurality of battery monomers fixed in the shell, the positive electrode of each battery monomer is electrically connected with the output circuit 40 through a positive electrode end plate 41, that is, the positive electrode end plate 41 connects the positive electrodes of each battery monomer, and then the positive electrode end plate 41 is connected to the output circuit 40, and the end of the output circuit 40 is used as a high-voltage positive electrode interface 42 of the battery pack to connect a power consumption device or a charger. The high-voltage positive electrode interface 42 of the battery pack, so that each battery monomer can realize the discharge or charging of the positive electrode. There is an exhaust hole 11 on the battery shell 10 of each battery monomer, which is used for sealingly installing an exhaust valve 20 of the thermal runaway protection device.

[0031] The thermal runaway protection device comprises a control circuit 30, and an exhaust valve 20 arranged in an exhaust hole 11 of the battery shell 10, wherein the exhaust valve 20 is made of conductive material, the control circuit 30 is electrically connected to a power supply 31 and the exhaust valve 20, and is coupled to an output circuit 40 of the battery pack, that is, the exhaust valve 20 on the battery shell 10 of each battery monomer is electrically connected to a control circuit 30; in the case that the exhaust valve 20 is opened by the thermal runaway gas in the battery shell 10, the control circuit 30 can be powered off to make the output circuit 40 of the battery pack powered off.

[0032] In this way, the exhaust valve 20 is made of conductive material, so that after the exhaust valve 20 is installed on the exhaust hole 11 of the battery shell 10, the battery shell 10, the exhaust valve 20, the control circuit 30 and the power supply 31 can form a loop, the control circuit 30 is powered on to make the control circuit 30 coupled to the output circuit 40, the battery pack is normally discharged, if the thermal runaway occurs in the battery monomer in the battery pack, the thermal runaway gas will open the exhaust valve 20 on the battery shell 10, the exhaust valve 20 and the battery shell 10 are separated and not in contact, so that the control circuit 30 is powered off, so that the output circuit 40 is also powered off, so that the battery pack is no longer used to carry the load, so that the load can be disconnected in the first time after the thermal runaway of the battery monomer, thereby effectively reducing the risk of accidents.

[0033] In detail, the battery shell 10 is welded to the shell to share the ground wire 14, and the thermal runaway protection device further comprises a relay 50, the input side 51 of the relay 50 is connected in series to the control circuit 30, and the output side 52 of the relay 50 is connected in series to the output circuit 40, so that the control circuit 30 and the output circuit 40 are coupled through the relay 50. In this way, in the case that the exhaust valve 20 is opened by the thermal runaway gas in the battery shell 10, the input side 51 of the relay 50 is powered off, the output side 52 of the relay 50 is disconnected to make the output circuit 40 powered off, and the battery is disconnected from the output circuit 40.

[0034] In the embodiment, the exhaust valve 20 is sealingly connected to the exhaust hole 11, the contact sheet 12 is connected to the outer surface of the battery shell 10, the contact sheet 12 is made of conductive material, and the contact sheet 12 is pressed on the exhaust valve 20, so that the electrical conduction between the battery shell 10 and the exhaust valve 20 is realized through the contact sheet 12 on the basis of ensuring the sealing connection between the exhaust valve 20 and the battery shell 10, and when the thermal runaway gas impacts the exhaust valve 20 to make the exhaust valve 20 be lifted up, the contact sheet 12 is separated from the battery shell 10 or the contact sheet 12 is separated from the exhaust valve 20, the control circuit 30 is powered off, the output side 52 of the relay 50 is disconnected, and the output circuit 40 is powered off.

[0035] In detail, the contact piece 12 is annular around the outer periphery of the exhaust hole 11, is convenient to set and reliably connects with the battery shell 10 and the exhaust valve 20 respectively when the thermal runaway does not occur. The contact piece 12 comprises an angle-joined connecting part 121 and a contact part 122, the connecting part 121 is used to connect the battery shell 10, and the contact part 122 is used to press on the exhaust valve 20.

[0036] The upper cover plate 13 and the compression spring 15 are further arranged on the outer surface of the battery shell 10, the compression spring 15 abuts between the exhaust valve 20 and the upper cover plate 13, so that the exhaust valve 20 is pressed in the exhaust hole 11, and the sealing ring 21 is arranged between the exhaust valve 20 and the exhaust hole 11, to ensure the sealing property in the non-exhaust state.

[0037] The working principle of the embodiment is shown as follows:

[0038] When the battery monomer works normally, the low-voltage power supply 31 forms a loop through the input side 51 of the relay 50-the control circuit 30-the exhaust valve 20-the contact piece 12-the battery shell 10-ground, so that the output side 52 of the relay 50 generates an attraction force, and the high-voltage output circuit 40 is powered on and conducted. When the battery monomer internally generates gas due to thermal runaway, the exhaust valve 20 is lifted, the contact piece 12 and the battery shell 10 are disconnected or the contact piece 12 is disconnected with the exhaust valve 20, the control circuit 30 is powered off, so that the output side 52 of the relay 50 is quickly disconnected, so that the output circuit 40 is powered off.

[0039] In addition, the embodiment of the application further discloses an electric ship comprising the battery system of the above embodiment, and thus has corresponding beneficial effects.

[0040] Finally, it should be noted that in this document, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device.

[0041] The above embodiments are only used to illustrate the technical solutions of the application, rather than limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A thermal runaway protection device, characterized in that, The thermal runaway protection device comprises a control circuit (30) and an exhaust valve (20) arranged in an exhaust hole (11) of a battery shell (10), the exhaust valve (20) is made of conductive material, the control circuit (30) is electrically connected to a power supply (31) and the exhaust valve (20), and is coupled to an output circuit (40) of a battery pack, and the control circuit (30) can be powered off to make the output circuit (40) of the battery pack powered off when the exhaust valve (20) is opened by thermal runaway gas inside the battery shell (10).

2. The thermal runaway protection device of claim 1, wherein, The thermal runaway protection device further comprises a relay (50), an input side (51) of the relay (50) is connected in series to the control circuit (30), and an output side (52) of the relay (50) is connected in series to the output circuit (40), and the output side (52) of the relay (50) is disconnected to make the output circuit (40) powered off when the exhaust valve (20) is opened by thermal runaway gas inside the battery shell (10).

3. The thermal runaway protection device of claim 1, wherein, The exhaust valve (20) is sealingly connected to the exhaust hole (11), and a contact sheet (12) made of conductive material is connected to an outer surface of the battery shell (10) and pressed against the exhaust valve (20).

4. The thermal runaway protection device of claim 3, wherein, The contact sheet (12) is annular around an outer periphery of the exhaust hole (11).

5. The thermal runaway protection device of claim 3 or 4, wherein, The contact sheet (12) comprises an angle-connected connecting part (121) and a contact part (122), the connecting part (121) is used to connect the battery shell (10), and the contact part (122) is used to press against the exhaust valve (20).

6. The thermal runaway protection device of claim 3 or 4, wherein, An upper cover plate (13) and a compression spring (15) are further arranged on the outer surface of the battery shell (10), and the compression spring (15) abuts between the exhaust valve (20) and the upper cover plate (13).

7. A battery system characterized by, The battery system comprises a battery pack and the thermal runaway protection device according to any one of claims 1-6, the battery pack has an output circuit (40), a shell, and a battery cell fixed in the shell, the exhaust valve (20) is arranged in an exhaust hole (11) of a battery shell (10) of the battery cell, the output circuit (40) is coupled to the control circuit (30), and a positive electrode of the battery cell is electrically connected to the output circuit (40) through a positive electrode end plate (41).

8. The battery system of claim 7, wherein, The battery shell (10) is welded to the shell to share a ground wire (14).

9. The battery system of claim 7, wherein, A sealing ring (21) is arranged between the exhaust valve (20) and the exhaust hole (11).

10. An electrically powered boat, characterized in that The battery system comprises the battery system according to any one of claims 7-9.

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