Cooling protection structure for battery pack and battery pack

Abstract

The utility model provides a cooling protection structure for a battery pack and the battery pack, the cooling protection structure for the battery pack comprises a protection structural member and a battery module installed on the battery pack, the protection structural member is provided with a plurality of nozzles, and the nozzles can spray cooling liquid to a busbar of the battery module; the storage part is communicated with the protective structural member, the cooling liquid is stored in the storage part, and the storage part is communicated with the battery pack and used for recycling the cooling liquid. According to the cooling protection structure for the battery pack and the battery pack, the problem of how to reduce the harm caused by high temperature under the condition of meeting the quick charging requirement of the battery pack can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a cooling protection structure for a battery pack and a battery pack. Background Art

[0002] With the development of technology, people have put forward higher and higher requirements on the charging speed of battery packs. However, high-rate fast charging of batteries will inevitably lead to a significant increase in heat generation, especially in the tab area inside the battery cell and the battery pack.

[0003] Since the battery temperature rises sharply, the excessively high temperature will have a great negative impact on the battery life and safety. Therefore, people have begun to put forward higher requirements for battery cooling and thermal runaway protection. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a temperature reduction protection structure and a battery pack for a battery pack, so as to solve the problem of how to reduce the harm caused by high temperature while meeting the fast charging requirements of the battery pack.

[0005] According to the first aspect of the utility model, a cooling protection structure for a battery pack is provided, wherein the cooling protection structure for the battery pack comprises: a protection structure member, which is installed on the battery module of the battery pack, and a plurality of nozzles are provided on the protection structure member, and the nozzles can spray cooling liquid to the bus of the battery module; and a storage part, which is connected to the protection structure member, and the cooling liquid is stored in the storage part, and the storage part is connected to the battery pack for recovering the cooling liquid.

[0006] Preferably, the protective structural member includes: a structural inlet connected to the storage portion; a main channel arranged along a first direction, and the coolant can flow into the main channel through the structural inlet; and a plurality of branch channels connected to the main channel, the plurality of branch channels are arranged at intervals in the first direction, the plurality of branch channels extend along the second direction, and the plurality of nozzles are respectively arranged in the plurality of branch channels.

[0007] Preferably, the plurality of nozzles are arranged corresponding to the plurality of bus bars of the battery module, and the nozzles are arranged directly above the bus bars.

[0008] Preferably, the coolant includes an immersion liquid for spraying during temperature reduction and a fire extinguishing agent for spraying during thermal runaway.

[0009] Preferably, the storage unit includes: a first storage device connected to the protective structure, the immersion liquid is stored in the first storage device, the first storage device is connected to the battery pack and is used to recover the immersion liquid; and a second storage device connected to the protective structure, the fire extinguishing agent is stored in the second storage device.

[0010] Preferably, the storage unit further includes: a three-way valve connected to the protective structure, the protective structure selectively connected to the first storage device or the second storage device through the three-way valve; and a first hydraulic pump disposed between the three-way valve and the protective structure.

[0011] Preferably, the storage unit further includes a second hydraulic pump, the second hydraulic pump being connected to the battery pack and the first storage device, and the second hydraulic pump being used to allow the immersion liquid to flow to the first storage device.

[0012] According to a second aspect of the present invention, a battery pack is provided, wherein the battery pack is equipped with the above-mentioned temperature reduction protection structure for the battery pack.

[0013] Preferably, the battery modules of the battery pack are mounted on an upper portion of a cold plate, and the cold plate is provided with windows at the busbars corresponding to the battery modules.

[0014] Preferably, the battery pack further comprises a bottom guard plate, wherein the bottom guard plate is mounted at the lower portion of the cold plate, a sealing gasket is provided between the bottom guard plate and the cold plate, a collecting hole is provided on the bottom guard plate, and the storage portion is connected to the collecting hole.

[0015] The cooling protection structure and battery pack for the battery pack of the embodiment of the utility model have a storage part storing coolant. The protection structure is installed on the battery module of the battery pack and is connected to the storage part, so that the storage part can provide coolant to the protection structure. A plurality of nozzles are arranged on the protection structure. The nozzle can spray coolant to the bus of the battery module to cool the battery pack when the temperature of the battery pack is too high. In addition, the storage part is connected to the battery pack, which can recover the coolant in the battery pack. This can effectively solve the problem of how to reduce the harm caused by high temperature while meeting the fast charging requirements of the battery pack.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of a protective structural member of a temperature reduction protective structure for a battery pack according to the utility model.

[0019] Figure 2 The utility model is a schematic diagram of a cooling protection structure for a battery pack and a structure of the battery pack.

[0020] Figure 3 It is a schematic diagram of a battery module according to the utility model.

[0021] Figure 4 It is a schematic diagram of a cooling protection structure for a battery pack and a partial structure of the battery pack according to the utility model.

[0022] Figure 5 It is a schematic diagram of a partial structure of a battery pack according to the utility model.

[0023] Figure 6 It is a schematic diagram of the temperature reduction protection structure for the battery pack and the battery pack according to another angle of the present invention.

[0024] Figure 7 It is a schematic diagram of a temperature reduction protection structure for a battery pack according to the utility model.

[0025] Figure markings: 1-protective structural member; 10-nozzle; 11-structure inlet; 12-main channel; 13-branch channel; 21-first storage device; 22-second storage device; 23-three-way valve; 24-first hydraulic pump; 25-second hydraulic pump; 3-battery module; 30-bus; 300-explosion-proof valve; 31-cold plate; 310-window; 32-sealing gasket; 33-bottom guard plate; 330-collection hole. DETAILED DESCRIPTION

[0026] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0027] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0028] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0029] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0030] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0031] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0032] The terms used herein are only used to describe various examples and are not used to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprising" and "having" list the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0033] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0034] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0035] like Figures 1 to 7 As shown, according to a first aspect of the present invention, a cooling protection structure for a battery pack is provided. The cooling protection structure for a battery pack includes a protection structure member 1 and a storage portion.

[0036] In the following description, reference will be made to Figures 1 to 7 The specific structure of the above components of the temperature reduction protection structure for the battery pack and the connection relationship of the above components are specifically described.

[0037] like Figures 1 to 7As shown, in an embodiment, the storage portion may be provided outside the battery pack, and coolant may be stored in the storage portion. The protective structure 1 may be installed on the battery module 3 of the battery pack. The protective structure 1 may be connected to the storage portion, and the storage portion may provide coolant to the protective structure 1. A plurality of nozzles 10 may be provided on the protective structure 1. The nozzle 10 may spray coolant onto the bus 30 of the battery module 3 to cool the battery pack when the temperature of the battery pack is too high, thereby reducing the harm caused by high temperature.

[0038] Preferably, Figures 1 to 6 As shown, in an embodiment, the protective structure 1 may include a structure inlet 11, a main channel 12 and a plurality of branch channels 13. The structure inlet 11 may be a channel opening for allowing coolant to flow into the protective structure 1. The structure inlet 11 may be connected to the storage part through a pipeline. The main channel 12 may be a tubular structure. Preferably, as Figure 4 As shown, the main channel 12 can be arranged along a first direction (the first direction can be the width direction of the battery module 3). The coolant can flow into the main channel 12 from the structural inlet 11, and the structural inlet 11 and the main channel 12 can be connected by a pipeline. A plurality of branch channels 13 can be respectively connected to the main channel 12. Preferably, a plurality of branch channels 13 are arranged at intervals in the first direction, and a plurality of the branch channels 13 can extend along a second direction (the second direction can be the length direction of the battery module 3). A plurality of nozzles 10 can be respectively arranged in a plurality of branch channels 13, so that the coolant can be sprayed out from the nozzles 10 of the branch channels 13. Such an arrangement makes it easy for the protective structure 1 to spray the coolant to the bus 30 of the battery module 3.

[0039] Further, preferably, Figure 2 , Figure 4 and Figure 6 As shown, in an embodiment, a plurality of nozzles 10 may be arranged corresponding to a plurality of busbars 30 of a battery module 3. Specifically, the nozzles 10 may be arranged one-to-one with the busbars 30, or every two nozzles 10 may be arranged corresponding to one busbar 30. More preferably, the nozzle 10 may be arranged directly above the busbar 30, so that the coolant sprayed from the nozzle 10 can flow through the busbar 30 below under the action of gravity, so as to achieve a better cooling effect. In this case, a plurality of branch channels 13 are respectively arranged directly above the multiple rows of busbars 30 of the battery module 3.

[0040] In addition, preferably, in an embodiment, the coolant may include an immersion liquid for spraying during cooling, and a fire extinguishing agent for spraying during thermal runaway. The immersion liquid may be a fluorocarbon or a hydrocarbon (such as mineral oil, etc.). Since the immersion liquid is an insulator, it can be used to cool the battery pack to achieve a cooling function. The fire extinguishing agent may be a material such as heptafluoropropane. In the event of thermal runaway, the fire extinguishing agent can reduce the temperature of the gas and prevent heat from spreading. At the same time, the fire extinguishing agent can consume active functional groups in the high-temperature gas and reduce the possibility of ignition of the high-temperature gas, thereby greatly reducing the risk of thermal runaway.

[0041] Preferably, Figure 7 As shown, in an embodiment, the storage unit may include a first storage unit 21 and a second storage unit 22. The first storage unit 21 and the second storage unit 22 may be arranged inside the vehicle body. Among them, the first storage unit 21 may be connected to the protective structure 1 through a pipeline. Immersion liquid may be stored in the first storage unit 21, that is, the first storage unit 21 is used to provide immersion liquid to the protective structure 1. The first storage unit 21 may be connected to the battery pack through a pipeline, so that the first storage unit 21 can recover the immersion liquid after heat exchange from the battery pack. The second storage unit 22 may be connected to the protective structure 1 through a pipeline. Fire extinguishing agent may be stored in the second storage unit 22, that is, the second storage unit 22 is used to provide fire extinguishing agent to the protective structure 1.

[0042] More preferably, Figure 7 As shown, in an embodiment, the storage unit may further include a three-way valve 23 and a first hydraulic pump 24. The three-way valve 23 may be connected to the protective structure 1 through a pipeline. The protective structure 1 may be selectively connected to the first storage 21 or the second storage 22 through the three-way valve 23, so that the protective structure 1 may selectively spray immersion liquid or fire extinguishing agent according to the situation. The first hydraulic pump 24 may be arranged between the three-way valve 23 and the protective structure 1, and is used to extract the coolant in the first storage 21 or the second storage 22, and transport it to the protective structure 1.

[0043] Preferably, Figure 7 As shown, in an embodiment, the storage unit may further include a second hydraulic pump 25. The second hydraulic pump 25 may be connected to the battery pack and the first storage 21. The second hydraulic pump 25 is used to extract the immersion liquid in the battery pack and make the immersion liquid flow to the first storage 21.

[0044] In addition, if Figures 1 to 7 As shown, according to a second aspect of the present utility model, a battery pack is provided, wherein the battery pack is equipped with the above-mentioned temperature reduction protection structure for the battery pack.

[0045] Preferably, Figures 2 to 6 As shown, in an embodiment, the battery module 3 of the battery pack can be fixed on the cold plate 31 by a thermally conductive structural adhesive. The cold plate 31 is provided with a window 310 at the bus 30 corresponding to the battery module 3. The window 310 can be in a strip shape, so that the immersion liquid sprayed on the bus 30 can flow to the lower part of the cold plate 31 through the window 310. Preferably, the number of the windows 310 can be multiple, and the multiple windows 310 can be arranged one-to-one corresponding to the multiple rows of buses 30 of the battery module 3.

[0046] More preferably, Figures 5 to 7 As shown, in an embodiment, the battery pack may further include a bottom guard plate 33. The bottom guard plate 33 may be installed at the lower part of the cold plate 31. Preferably, a sealing gasket 32 ​​may be provided between the bottom guard plate 33 and the cold plate 31, so that a closed space is formed between the cold plate 31 and the bottom guard plate 33 for accommodating the immersion liquid flowing down from the upper part of the cold plate 31. A collecting hole 330 may be provided on the plate surface of the bottom guard plate 33, so that the immersion liquid can flow out from the collecting hole 330. The storage part may be connected to the collecting hole 330, and the immersion liquid can flow from the collecting hole 330 to the first storage device 21 under the action of the second hydraulic pump 25.

[0047] During use, when the battery pack is fast charged at a high rate, the cooling protection structure for the battery pack can cooperate with the cold plate 31 to cool the battery pack. Specifically, the immersion liquid can flow from the structure inlet 11 to the main channel 12, and be distributed to the nozzles 10 of multiple branch channels 13. The nozzle 10 sprays the immersion liquid onto the bus 30 and the cell cover below, thereby cooling the battery cells of the battery pack (i.e., cooling the heating structures such as the tabs). Subsequently, the immersion liquid flows downward under the action of gravity, and flows through the window 310 to between the cold plate 31 and the bottom guard plate 33. Finally, the immersion liquid is collected and flows from the collection hole 330 to the first storage 21 under the action of the second hydraulic pump 25. The protective structure 1 can be connected only to the first storage 21 through a three-way valve, so that the first hydraulic pump 24 can only extract the immersion liquid from the first storage 21, so that the immersion liquid can be recycled.

[0048] When thermal runaway occurs in the battery pack, the protective structure 1 can be connected only to the second storage 22 through the three-way valve, so that the first hydraulic pump 24 can only extract the fire extinguishing agent from the second storage 22. The fire extinguishing agent enters the protective structure 1 under the action of the first hydraulic pump 24, and then is sprayed out from the nozzle 10 (the fire extinguishing agent does not need to be recovered). When the battery module 3 is in thermal runaway, the corresponding explosion-proof valve 300 will open and spray high-temperature gas. The fire extinguishing agent sprayed from the nozzle 10 can reduce the temperature of the gas and prevent heat from spreading. At the same time, the fire extinguishing agent can consume the active functional groups in the high-temperature gas, reduce the possibility of ignition of the high-temperature gas, and thus greatly reduce the risk of thermal runaway.

[0049] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A cooling protection structure for a battery pack, installed in the battery pack, characterized in that: The cooling protection structure for the battery pack includes: A protective structure installed on the battery module of the battery pack, wherein the protective structure is provided with a plurality of nozzles, and the nozzles are capable of spraying cooling liquid toward the busbar of the battery module; and A storage unit is connected to the protective structure, the cooling liquid is stored in the storage unit, and the storage unit is connected to the battery pack for recovering the cooling liquid.

2. The cooling protection structure for a battery pack according to claim 1, characterized in that: The protective structure comprises: a structural inlet, connected to the storage portion; A main flow channel is arranged along a first direction, and the coolant can flow into the main flow channel through the structural inlet; and A plurality of branch channels are connected to the main channel, the plurality of branch channels are arranged at intervals in the first direction, the plurality of branch channels extend along the second direction, and the plurality of nozzles are respectively arranged in the plurality of branch channels.

3. The cooling protection structure for a battery pack according to claim 2, characterized in that: The plurality of nozzles are arranged corresponding to the plurality of bus bars of the battery module, and the nozzles are arranged directly above the bus bars.

4. The cooling protection structure for a battery pack according to claim 1, characterized in that: The coolant includes an immersion liquid for spraying during temperature reduction and a fire extinguishing agent for spraying during thermal runaway.

5. The cooling protection structure for a battery pack according to claim 4, characterized in that: The storage unit includes: a first storage device connected to the protective structure, the immersion liquid being stored in the first storage device, the first storage device being connected to the battery pack and used for recovering the immersion liquid; and The second storage device is connected to the protection structure, and the fire extinguishing agent is stored in the second storage device.

6. The cooling protection structure for a battery pack according to claim 5, characterized in that: The storage unit also includes: a three-way valve connected to the protective structure, wherein the protective structure is selectively connected to the first storage device or the second storage device through the three-way valve; and The first hydraulic pump is arranged between the three-way valve and the protective structure.

7. The cooling protection structure for a battery pack according to claim 6, characterized in that: The storage unit further includes a second hydraulic pump connected to the battery pack and the first storage unit, and the second hydraulic pump is used to allow the immersion liquid to flow to the first storage unit.

8. A battery pack, characterized in that: The battery pack is equipped with a temperature reduction protection structure for the battery pack according to any one of claims 1 to 7.

9. The battery pack according to claim 8, characterized in that: The battery modules of the battery pack are mounted on the upper part of the cold plate, and the cold plate is provided with windows at the busbars corresponding to the battery modules.

10. The battery pack according to claim 9, characterized in that: The battery pack further includes a bottom guard plate, which is installed at the bottom of the cold plate. A sealing gasket is provided between the bottom guard plate and the cold plate. A collecting hole is provided on the bottom guard plate, and the storage part is connected to the collecting hole.

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