High-voltage battery with a valve arrangement for degassing

Abstract

A high-voltage battery comprising a battery housing (101) with a space (103) for receiving cell modules (102) of the high-voltage battery, wherein the battery housing (101) includes an opening (108) for degassing the high-voltage battery through which gas from the oil-filled space (103) can escape from the battery housing (101), wherein a valve arrangement closes the opening (108), the valve arrangement comprising a first valve (105) and a second valve (106), the first valve (105) being arranged between the second valve (106) and the oil-filled space (103), the first valve (105) being configured to close a passage (109) of the valve arrangement for degassing the high-voltage battery, the second valve (106) being configured to close the passage (109), the first valve (105) being irreversibly configured for degassing the high-voltage battery is designed to be openable, wherein the second valve (106) is designed toto open the passage (109) for degassing the high-voltage battery and to close it again after degassing, wherein a spring (107) is designed as a tension spring which is arranged between the first valve (105) and the second valve (106) in the valve housing (104) and which pulls the second valve (106) onto an opening in the passage (109).

Description

The invention relates to a high-voltage battery having a valve arrangement for degassing.US 2021 / 0 341 068 A1 discloses a valve for forming a passage through an inside and an outside of a container made of resin molded parts or sheets which communicate with each other. A rupture valve is arranged to block and rupture the passageway when the internal pressure of the packaging container increases due to gas generated in the container. A check valve is also provided which is disposed on a secondary side which is located on an outer side of the burst valve in the passage and through which the gas discharges to the outside from the inside of the container. The container is particularly well suited for contents that generate gas over time. Examples of the contents of the container are coffee, fermented foods (e.g., miso), and long-shelf-life foods. According to another embodiment, the container is a lithium ion secondary battery and includes battery elements such as electrodes and an electrolyte solution as contents.DE 19 08 041 U discloses a pressure relief device for tanks. In an opening of the tank, a screw-in pipe socket has a valve seat in the region of its upper end. A closure piece interacting directly or indirectly with the valve seat is held on the pipe socket by means of a load spring, which closure piece closes the valve seat from above in its rest position.DE 12 08 579 A discloses a spring-loaded safety valve with a cup-shaped closure piece placed on a cylindrical housing. A spring designed as a tension spring is fastened on the one hand to a flange of the housing. On the other hand, the spring is screwable into threads provided in the inner surface of the closure piece.EP 4 231 426 A1 discloses a valve which adjoins an outer space of a high-voltage battery in order to degas the high-voltage battery.The high-voltage battery according to Claim 1 comprises a battery housing having a space for accommodating cell modules of the high-voltage battery. The battery housing comprises an opening for degassing the high-voltage battery, through which gas can escape from the oil-filled space from the battery housing, wherein a valve arrangement closes the opening, wherein the valve arrangement comprises a first valve and a second valve, wherein the first valve is arranged between the second valve and the oil-filled space, wherein the first valve is designed to close a passage of the valve arrangement for degassing the high-voltage battery, wherein the second valve is designed to close the passage, wherein the first valve for degassing the high-voltage battery is designed to be irreversibly openable, wherein the second valve is designed to open the passage for degassing the high-voltage battery and to close it again after degassing, wherein the spring is designed as a tension spring which is designed as a tension spring which opens up the passage for degassing the high-voltage batteryis arranged between the first valve and the second valve, anddrawing the second valve onto an opening in the passage.Preferably, the first valve comprises a rupture disk, wherein the rupture disk is designed to rupture for degassing the high-voltage battery.Preferably, the valve arrangement has a common valve housing for the first valve and the second valve.The second valve is preferably designed as a spring valve with a spring, wherein the spring is designed to hold the second valve in a position in which the second valve closes the passage before degassing and after degassing.According to the invention, the spring is thus designed as a tension spring, wherein the spring pulls the second valve onto an opening in the passage.According to the invention, the spring is thus arranged in the valve housing.According to the invention, the spring is thus arranged between the first valve and the second valve.Thus, the high-voltage battery according to the invention has the valve arrangement, wherein the high-voltage battery comprises the battery housing with the oil-filled space for receiving cell modules of the high-voltage battery, wherein the battery housing comprises the opening for degassing the high-voltage battery, through which gas can escape from the space from the battery housing, wherein the valve arrangement closes the opening. The first valve is arranged between the second valve and the space.Further advantageous embodiments can be seen from the following description and the drawing. The drawing shows: FIG. 1 shows a schematic illustration of a high-voltage battery with a valve arrangement in a first operating state of the high-voltage battery, FIG. 2 shows a schematic illustration of the high-voltage battery with the valve arrangement in a second operating state of the high-voltage battery, FIG. 3 shows a schematic illustration of the high-voltage battery with the valve arrangement in a third operating state of the high-voltage battery.FIG. 1 shows a schematic illustration of a high-voltage battery with a valve arrangement in a first operating state of the high-voltage battery.In the first operating state, the high-voltage battery is in a state before degassing of the high-voltage battery.The high-voltage battery comprises a battery housing 101. Cell modules 102 of the high-voltage battery are arranged in the battery housing 101. an oil-filled space 103 is arranged between the cell modules 102 and the battery housing 101. The valve assembly includes a valve housing 104. In the valve housing 104, a first valve 105 and a second valve 106 are arranged in series.The first valve 105 comprises a rupture disk in the example. The second valve 106 is spring-mounted, i.e. designed as a spring valve with a spring 107. The battery housing 101 has an opening 108 for degassing the battery housing 101. The opening 108 is closed by the valve assembly. The valve arrangement has a passage 109 for degassing the battery housing 101.The passage 109 is closed by the undamaged first valve 105 and by the second valve 106.The spring 107 is configured to hold the second valve 106 in a position in which the second valve 106 closes the passage 109 before degassing and after degassing. The spring 107 is disposed in the valve housing 104. The spring is a tension spring that pulls the second valve 106 onto an opening in the passage 109 of the valve assembly 104.The first valve 105 is disposed between the oil-filled space 103 and the second valve 107.The first valve 105 is designed to irreversibly open in the event of a defined overpressure in the battery housing 101. In the example, the rupture disk is designed to rupture at a defined overpressure.The second valve 106 is designed to open when the overpressure in the battery housing 101 exceeds a defined overpressure. The second valve 106 is designed to close when the overpressure in the battery housing 101 falls below a defined overpressure. In the example, the positive pressure at which the second valve 106 opens and the positive pressure at which the second valve 106 closes are the same positive pressure. For example, the spring force is designed accordingly.In the example, the positive pressure at which the first valve 105 irreversibly opens and the positive pressure at which the second valve 106 opens is the same positive pressure. It can be provided that the overpressures at which the valves open differ.The valve body 104 comprises a passage 109 through which gas can escape from the oil-filled space 103 through the valve arrangement from the battery housing 101 when the first valve 105 and the second valve 106 are open.Oil from the oil-filled space 103 cannot flow through the passage 109 in the example when one of the valves or when both of the valves are closed.Gas exiting a cell module 102 may not flow through the passage 109 when one or both of the valves are closed, in the example.The first operating state represents a normal state of the high voltage battery.No leakage occurs through the first valve 105 in the first operating state. In the first operating state, the first valve 105 prevents foreign bodies from entering the battery housing 101. The second valve 106 can be designed as a mechanical valve with spring 107, in which a minimum leakage cannot be avoided.The second valve 106 prevents oil from continuing to drain out of the battery housing 101 after degassing or damage to the first valve 105, in which the first valve 105 irreversibly opens.The two valves are arranged in series. The first valve 105 abuts the oil-filled space 103 and holds the oil inside the battery.In the case of an outgassing cell module, the first valve 105 opens irreversibly in a second operating state and reversibly the second valve 106 directly thereafter.FIG. 2 shows a schematic illustration of the high-voltage battery with the valve arrangement in the second operating state of the high-voltage battery.In the second operating state, the high-voltage battery is in a state caused by a outgassing cell module 201 during degassing of the high-voltage battery. A gas flow 202 with irreversibly destroyed first valve 105 and reversibly open second valve 106 through the space 103 and the passage 109 from the battery housing 101 is schematically illustrated in FIG. 2.The second valve 106 closes in a third operating state after degassing the high-voltage battery and ensures that no further oil can escape.FIG. 3 shows a schematic illustration of the high-voltage battery with the valve arrangement in the third operating state of the high-voltage battery.In the third operating state, the high-voltage battery is in a state after degassing the high-voltage battery. The first valve 105 is irreversibly open. The second valve 106 is closed again.It is advantageous that the serially arranged valves compensate for the disadvantages of a single valve. After degassing, the oil remains inside the high-voltage battery.The second valve 106 is closed again after degassing. No further oil can escape.The high-voltage battery is arranged, for example, in a vehicle which comprises battery management.It can be provided that degassing of the high-voltage battery is detected by the battery management and continued driving of the vehicle is prevented.In this case, it is no longer problematic that the oil directly abuts on the second valve 106. Low leakage rates are acceptable since the high-voltage battery has already ejected a small amount of oil during degassing.

Claims

High-voltage battery, which comprises a battery housing (101) having a space (103) for receiving cell modules (102) of the high-voltage battery, wherein the battery housing (101) comprises an opening (108) for degassing the high-voltage battery, through which gas can escape from the oil-filled space (103) from the battery housing (101), wherein a valve arrangement closes the opening (108), wherein the valve arrangement comprises a first valve (105) and a second valve (106), wherein the first valve (105) is arranged between the second valve (106) and the oil-filled space (103), wherein the first valve (105) is designed to close a passage (109) of the valve arrangement for degassing the high-voltage battery, wherein the second valve (106) is designed to close the passage (109), wherein the first valve (105) for degassing the high-voltage battery is designed such that it can be opened irreversibly, wherein the second valve (106) is designed to open the passage (109) for degassing the high-voltage battery and to close it again after degassing, wherein a spring (107) is designed as a tension spring which - is arranged between the first valve (105) and the second valve (106) in the valve housing (104) and - pulls the second valve (106) onto an opening in the passage (109).High-voltage battery according to Claim 1, characterized in that the first valve (105) comprises a rupture disc, the rupture disc being designed to rupture for degassing the high-voltage battery.High-voltage battery according to one of the preceding claims, characterized in that the valve arrangement has the valve housing (104) as a common valve housing (104) for the first valve (105) and the second valve (106).High-voltage battery according to one of the preceding claims, characterized in that the second valve (106) is designed as a spring valve with the spring (107), wherein the spring (107) is designed to hold the second valve (106) in a position in which the second valve (106) closes the passage (109) before degassing and after degassing.

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