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CN-115966814-B - Cooling device, motor vehicle battery and method for operating a cooling unit

CN115966814BCN 115966814 BCN115966814 BCN 115966814BCN-115966814-B

Abstract

A cooling device (12) for cooling a cell assembly (16) of a motor vehicle battery (10) having a plurality of cell units (14, 14a, 14 b), wherein the cooling device (12) has a plurality of cooling units (22, 22a, 22 b), each of the cooling units (22, 22a, 22 b) being assigned to one of the cell units (14, 14a, 14 b), the cooling device (12) having a control device (24) which is designed to control the cooling power of each of the cooling units (22, 22a, 22 b) in each case. The control device (24) is designed to control the cooling units (22, 22a, 22 b) in a determined first cooling mode (M1) differently than in a determined second cooling mode (M2) different from the first cooling mode, the cooling arrangement (12) being arranged to switch from the first cooling mode (M1) to the second cooling mode (M2) in case of a fault condition (F) involving a first monomer unit (14, 14a, 14 b) of the plurality of monomer units (14, 14a, 14 b).

Inventors

  • MAIN EDUARD

Assignees

  • 奥迪股份公司

Dates

Publication Date
20260512
Application Date
20221012
Priority Date
20211013

Claims (8)

  1. 1. A cooling device (12) for cooling a cell assembly (16) of a motor vehicle battery (10) having a plurality of cell units (14, 14a, 14 b), -Wherein the cooling device (12) has a plurality of cooling units (22, 22a, 22 b); -wherein each of the cooling units (22, 22a, 22 b) is assigned to one of the monomer units (14, 14a, 14 b), respectively, -wherein the cooling device (12) has a control device (24) which is designed to control the cooling power of each of the cooling units (22, 22a, 22 b), respectively; It is characterized in that the method comprises the steps of, Wherein the control device (24) is designed to control the cooling units (22, 22a, 22 b) in a defined first cooling mode (M1) in a different manner than in a defined second cooling mode (M2) different from the first cooling mode, wherein the cooling arrangement (12) is arranged to switch from the first cooling mode (M1) to the second cooling mode (M2) in the event of a fault (F) involving a first monomer unit (14, 14a, 14 b) of the plurality of monomer units (14, 14a, 14 b), The control device (24) is configured to switch from a first cooling mode (M1) to a second cooling mode (M2) when a fault condition (F) is detected, which relates to a first monomer unit (14, 14 a) of the plurality of monomer units (14, 14a, 14 b), wherein the cooling system (12) has a detection device (46) which is configured to detect the fault condition (F), The first monomer unit (14, 14 a) being assigned a first cooling unit (22, 22 a) of a plurality of cooling units (22, 22a, 22 b), a second monomer unit (14, 14 b) of the plurality of monomer units (14, 14a, 14 b) being different from the first monomer unit (14, 14 a) being assigned a second cooling unit (22, 22 b) of the plurality of cooling units (22, 22a, 22 b) being different from the first cooling unit (22, 22 a), respectively, wherein the control device (24) is arranged to deactivate at least one of the second cooling units (22, 22 b) in the second cooling mode (M2), The cooling unit that is spatially farthest from the first cooling unit assigned to the damaged monomer module is first deactivated, At least one of the second cooling units is deactivated to increase the cooling power for the first cooling unit.
  2. 2. The cooling device (12) according to claim 1, characterized in that the detection means (46) are designed to detect a temperature of the first monomer unit (14, 14 a) for detecting a fault condition (F) and to detect a fault condition (F) when the temperature exceeds a predetermined first limit value.
  3. 3. The cooling device (12) according to claim 1, characterized in that the cooling device (12) has a cooling circuit (26) through which a coolant can flow, wherein the cooling units (22, 22a, 22 b) are configured to be flowed through by the coolant and are part of the cooling circuit (26), wherein each of the cooling units (22, 22a, 22 b) is assigned at least one valve device (40 a, 40 b) of the cooling device (12) which can be controlled by a control device (24), by means of which the coolant flow through the respective cooling unit (22, 22a, 22 b) can be adjusted, wherein the cooling units (22, 22a, 22 b) can be supplied with coolant via a common supply line (32) of the cooling device (12) and/or via a common coolant reservoir (28) of the cooling device (12).
  4. 4. The cooling device (12) according to claim 1, characterized in that a first monomer unit (14, 14 a) is assigned to a first cooling unit (22, 22 a) of a plurality of cooling units (22, 22a, 22 b), a second monomer unit (14, 14 b) of the plurality of monomer units (14, 14a, 14 b), which is different from the first monomer unit (14, 14 a), is assigned to a second cooling unit (22, 22 b) of the plurality of cooling units (22, 22a, 22 b), respectively, which is different from the first cooling unit (22, 22 a), wherein the control means (24) are arranged to increase the cooling power assigned to the first cooling unit (22, 22 a) and/or to maximize the cooling power assigned to the first cooling unit (22, 22 a) in the second cooling mode (M2) under at least one predetermined boundary condition.
  5. 5. The cooling apparatus (12) of claim 4 wherein the predetermined boundary conditions include: -controlling the second cooling unit (22, 22 b) in the same way as in the first cooling mode (M1), and/or -Operating at least one of the second cooling units (22, 22 b) with a lower cooling power than the first cooling mode (M1), and/or -Deactivating at least one of the second cooling units (22, 22 b).
  6. 6. The cooling device (12) according to claim 4 or 5, characterized in that the control means (24) are arranged to deactivate at least one of the second cooling units (22, 22a, 22 b) and/or to deactivate all of the second cooling units (22, 22 b) in the second cooling mode (M2) depending on the position of the second cooling units (22, 22a, 22 b) relative to the first cooling units (22, 22 a).
  7. 7. A motor vehicle battery (10) having a cooling device (12) according to any one of claims 1-6.
  8. 8. A method of operating a plurality of cooling units (22, 22a, 22 b) for cooling a monomer assembly (16) having a plurality of monomer units (14, 14a, 14 b), wherein each of the cooling units (22, 22a, 22 b) is assigned to one of the monomer units (14, 14a, 14 b), respectively, and wherein a control device (24) controls the cooling power of each of the cooling units (22, 22a, 22 b), respectively; It is characterized in that the method comprises the steps of, In a defined first cooling mode (M1), the control device (24) controls the cooling units (22, 22a, 22 b) in a different manner than in a defined second cooling mode (M2) different from the first cooling mode, wherein, in dependence on a fault situation (F) involving a first monomer unit (14, 14 a) of the plurality of monomer units (14, 14a, 14 b), a transition is made from the first cooling mode (M1) to the second cooling mode (M2), The control device (24) is configured to switch from a first cooling mode (M1) to a second cooling mode (M2) when a fault condition (F) is detected, which relates to a first monomer unit (14, 14 a) of the plurality of monomer units (14, 14a, 14 b), wherein the cooling system (12) has a detection device (46) which is configured to detect the fault condition (F), The first monomer unit (14, 14 a) being assigned a first cooling unit (22, 22 a) of a plurality of cooling units (22, 22a, 22 b), a second monomer unit (14, 14 b) of the plurality of monomer units (14, 14a, 14 b) being different from the first monomer unit (14, 14 a) being assigned a second cooling unit (22, 22 b) of the plurality of cooling units (22, 22a, 22 b) being different from the first cooling unit (22, 22 a), respectively, wherein the control device (24) is arranged to deactivate at least one of the second cooling units (22, 22 b) in the second cooling mode (M2), The cooling unit that is spatially farthest from the first cooling unit assigned to the damaged monomer module is first deactivated, At least one of the second cooling units is deactivated to increase the cooling power for the first cooling unit.

Description

Cooling device, motor vehicle battery and method for operating a cooling unit Technical Field The invention relates to a cooling device for cooling a cell assembly of a motor vehicle battery, comprising a plurality of cell units, wherein the cooling device comprises a plurality of cooling units, wherein each of the cooling units is assigned to one of the cell units, and wherein the cooling units comprise a control device which is designed to control the cooling power of each of the cooling units. The invention further relates to a motor vehicle battery having such a cooling device and to a method for operating a cooling unit. Background Batteries for motor vehicles, in particular for electric or hybrid vehicles, are known from the prior art. The battery is usually designed as a high-voltage battery and comprises a plurality of battery cells, which can also form a battery module, for example. The monomer must generally be cooled during charging and during operation of the motor vehicle. For this purpose, current high-voltage batteries are equipped with large cooling plates according to the prior art. In this case, all or at least a plurality of individual modules are positioned on a cooling plate. Thus, a plurality of individual modules always share one cooling plate. The cooling water always runs over all modules located on the common cooling plate at the same time. Since the modules are spread over a common cooling plate, the disadvantage is that only the modules can be cooled or heated jointly. As a result, individual modules cannot be cooled in a targeted manner. The cooling power is thus always controlled according to the cooling demand of the hottest module. In order to avoid this disadvantage, cooling systems are also known from the prior art which achieve individual cooling of the cells or of the battery modules. For example, WO 2013/178577 A1 describes a coolant distribution system according to which individual monomers can be cooled individually. Furthermore, DE 10 2010 025 525 A1 describes a method for cooling a battery pack, wherein at least one battery pack is divided into a plurality of modules, each module being cooled separately. Here, the cooling of one module can be performed independently of the cooling temperature of the other modules. Cooling of one module may also be based on the temperature of another module having the highest temperature value. In this case, simplification is achieved by adjusting the temperature of the hottest module. But this compromises the advantages of the cooling-only option. Furthermore, DE 10 2016 215 851 A1 describes a cooling device for battery components. The cooling device has at least two individual cooling elements which are designed separately and are located opposite the battery, and are each supplied with coolant via a respective valve which is associated with the respective individual cooling element. Furthermore, DE 10 2019 213 757 B3 describes a cooling circuit arrangement for a battery arrangement having a plurality of battery modules, in which a coolant valve associated with a respective battery module is opened, in particular for the purpose of cooling the respective battery module when the operating temperature of the respective battery module exceeds a predetermined threshold value or for the purpose of heating the respective battery module when the operating temperature of the respective battery module falls below a predetermined threshold value. In the above-described system, it is here always the precondition that all the cells of the battery are cooled as uniformly as possible in order to achieve as uniform aging of all the cells as possible, thereby increasing the service life of the entire battery as much as possible. But at the same time other aspects, in particular safety aspects, are omitted. Disclosure of Invention It is therefore an object of the present invention to provide a cooling device, a motor vehicle battery and a method which increase the safety associated with a motor vehicle battery. This object is achieved by a cooling device, a motor vehicle battery and a method having the features according to the respective independent claims. The subject matter of the dependent claims, the description and the figures is an advantageous embodiment of the invention. The cooling device according to the invention for cooling a cell assembly of a motor vehicle battery, which has a plurality of cell units, has a plurality of cooling units, wherein each of the cooling units is assigned to one of the cell units, and the cooling device has a control device, which is designed to control the cooling power of each of the cooling units individually. The control device is designed to control the cooling unit in a defined first cooling mode in a different manner than in a defined second cooling mode different from the first cooling mode, wherein the cooling system is configured to switch from the first cooling mode to the second cooling mode in the