Battery cell assembly, battery pack and vehicle

Abstract

The embodiment of the utility model provides a battery cell assembly, a battery pack and a vehicle. The battery cell assembly comprises a shell, a high-voltage connecting piece and a protective piece, the shell is provided with a groove, and the high-voltage connecting piece is arranged at the bottom of the groove; the high-voltage connecting piece is wrapped by the protection piece, and the protection piece is connected to the groove bottom of the groove so as to protect the high-voltage connecting piece. Therefore, when the battery pack is subjected to thermal runaway and the spraying head sprays the spraying liquid to the battery cell module, the high-voltage connecting piece can be protected through the protection piece, so that the spraying liquid is prevented from flowing to the high-voltage connecting piece to cause short circuit, the battery pack has relatively good performance, and the potential safety hazard is reduced.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and specifically relates to a battery cell assembly, a battery pack and a vehicle. Background Art

[0002] Battery packs are used to provide electrical energy for vehicles and are an important source of power. Battery packs generate a lot of heat during operation. Therefore, the thermal safety of battery packs has also received widespread attention.

[0003] A battery pack typically consists of a housing and a liquid cooling plate, along with battery modules and high-voltage connectors housed within the housing. The liquid cooling plate is equipped with a spray head that sprays liquid onto the battery modules to cool them down and prevent fire in the event of thermal runaway.

[0004] However, when the spray head sprays the spray liquid on the battery cell module, the spray liquid easily flows to the high-voltage connector, causing the high-voltage connector to easily generate a short circuit risk, affecting the electrical performance of the battery pack. Utility Model Content

[0005] In view of the above problems, the present invention is proposed to provide a battery cell assembly, a battery pack and a vehicle that overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides a battery cell assembly, the battery cell assembly comprising: a housing, a high-voltage connector, and a protective member;

[0008] The housing is provided with a groove, and the high-voltage connector is arranged at the bottom of the groove;

[0009] The protective member is covered on the high-voltage connecting member, and the protective member is connected to the bottom of the groove to protect the high-voltage connecting member.

[0010] Optionally, the battery cell assembly further includes a battery cell module, the battery cell module is disposed in the groove and connected to the high-voltage connector, and the protective member is sealed to the bottom surface and / or peripheral surface of the battery cell module;

[0011] The height of the battery cell module is L, the distance between the protective member and the notch of the groove is h2, and h2 and L satisfy: h2≧1 / 3*L.

[0012] Optionally, the battery cell module includes a tab member, which is disposed at the bottom of the battery cell module and is electrically connected to the high-voltage connector.

[0013] Optionally, the battery cell assembly further includes a liquid cooling plate, which is connected to the notch of the groove and is arranged above the battery cell module to cool the battery cell module.

[0014] Optionally, a spray head is provided on one side of the liquid cooling plate facing the bottom of the groove, and the spray head is used to spray a cooling medium to cool the battery cell module.

[0015] Optionally, the battery cell module includes a plurality of battery cells, and the number of the spray heads includes a plurality, and the plurality of spray heads are arranged at intervals to cool down the plurality of battery cells respectively.

[0016] Optionally, the protective member is a foam expansion member.

[0017] Optionally, the foam expansion element is made of polyurethane.

[0018] In a second aspect, an embodiment of the present application provides a battery pack, which includes the battery cell assembly.

[0019] In a third aspect, an embodiment of the present application proposes a vehicle, which includes the above-mentioned battery pack or the above-mentioned battery cell assembly.

[0020] In an embodiment of the present application, the battery cell assembly includes: a housing, a high-voltage connector, and a protective member; the housing has a groove, and the high-voltage connector is disposed at the bottom of the groove; the protective member covers the high-voltage connector and is connected to the bottom of the groove to protect the high-voltage connector. In this way, in the event of thermal runaway of the battery pack, when the spray head sprays liquid on the battery cell module, the protective member can protect the high-voltage connector, preventing the spray liquid from flowing to the high-voltage connector and causing a short circuit, thereby improving the performance of the battery pack and reducing safety risks.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic structural diagram of a battery cell assembly according to an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of a battery cell assembly described in an embodiment of the present application;

[0025] Figure 3 This is a structural schematic diagram of a battery module of a battery assembly according to an embodiment of the present application;

[0026] Figure 4 This is another structural schematic diagram of a battery cell module of a battery cell assembly according to an embodiment of the present application;

[0027] Figure 5 This is a schematic structural diagram of a liquid cooling plate for a battery cell assembly described in an embodiment of the present application.

[0028] Figure numerals: 10 - housing; 11 - groove; 20 - high-voltage connector; 30 - protective member; 40 - battery cell module; 41 - ear piece; 42 - explosion-proof valve; 50 - liquid cooling plate; 51 - spray head. DETAILED DESCRIPTION

[0029] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of these features. In the description of this utility model, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected items, and the character " / " generally indicates an "or" relationship between the connected items.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] Reference Figures 1 to 5 , shows a structural schematic diagram of a battery cell assembly applied to a battery pack in an embodiment of the present application. The battery cell assembly may specifically include: a shell 10, a high-voltage connector 20 and a protective member 30; the shell 10 is provided with a groove 11, and the high-voltage connector 20 is arranged at the bottom of the groove 11; the protective member 30 is covered on the high-voltage connector 20, and the protective member 30 is connected to the bottom of the groove 11 to protect the high-voltage connector 20.

[0034] In an embodiment of the present application, in the event of thermal runaway of the battery pack, when the spray head 51 sprays the spray liquid on the battery cell module 40, the protective member 30 can protect the high-voltage connector 20 to prevent the spray liquid from flowing to the high-voltage connector 20 and causing a short circuit, thereby enabling the battery pack to have better performance and reducing safety hazards.

[0035] In the embodiment of the present application, the high-voltage connector 20 is a high-voltage connector within the battery pack, used to transmit high-voltage, high-current circuits to electrical devices such as the motor used to drive the vehicle. The high-voltage connector 20 can be a connector with an operating voltage of 60-800V. In addition, there are also cases where the operating voltage of the high-voltage connector 20 is greater than 800V, and the configuration can be adjusted according to actual needs.

[0036] For example, in an embodiment of the present application, the battery cell assembly can be used in a device with a sprinkler fire extinguishing structure installed on the top of the battery pack. The recess 11 of the housing 10 is used to provide space for the battery cell module 40, the high-voltage connector 20, and the protective structure, providing better protection.

[0037] In the embodiment of the present application, for example, the protective member 30 is a foam expansion member. In this way, the protective member 30 can provide a denser wrapping effect on the high-voltage connector 20 through the foam expansion member. Specifically, during the assembly of the battery pack, the battery cell module 40 can be pre-connected and assembled with the high-voltage connector 20, and then the foam expansion member can be injected into the shell 10. At this time, the foam expansion member is in liquid state. Then, the battery cell module 40 connected to the high-voltage connector 20 is placed in the shell 10. As time goes by, the foam expansion member expands into a gel state or a solid state, achieving a relatively tight wrapping of the high-voltage connector 20.

[0038] In the embodiment of the present application, adding a foam expansion member to fill the high-voltage circuit at the bottom of the protective battery cell module 40 can also achieve an improvement in the mode and stiffness of the battery pack, thereby improving the reliability and safety performance of the battery pack in working conditions such as vibration and impact. It can also improve the protection effect and battery safety performance in bottom safety working conditions such as the bottom of the battery pack being hit, the bottom of the vehicle being supported, and the bottom of the vehicle being scraped.

[0039] For example, in the embodiment of the present application, the material of the foam expansion part is polyurethane. In addition, other materials that can achieve better protection effects on the high-voltage connector 20 can also be used. The embodiment of the present application does not limit the specific material of the foam expansion part.

[0040] Optionally, in an embodiment of the present application, the battery cell assembly further includes a battery cell module 40, which is arranged in the groove 11 and connected to the high-voltage connector 20, and the protective member 30 is sealed with the bottom surface and / or the peripheral surface of the battery cell module 40. The height of the battery cell module 40 is L, and the distance between the protective member 30 and the notch of the groove 11 is h2, and h2 and L satisfy: h2≧1 / 3*L. In this way, a better sealing effect is formed by the protective member 30 and the bottom surface and / or the peripheral surface of the battery cell module 40, so that the protective member 30 can achieve relatively tight protection at the connection position between the high-voltage connector 20 and the battery cell module 40, thereby achieving a reliable protective effect. In addition, through the above-mentioned dimensional relationship setting, other electrical components (such as wiring harnesses, copper busbars, collection boards, etc.) arranged on the upper surface of the protective member 30 can also have relatively sufficient layout space.

[0041] For example, in the embodiment of the present application, the battery cell module 40 includes a plurality of battery cell units, which are arranged in an array to form the battery cell module 40. For example, the battery cell units can be square battery cells, cylindrical battery cells, etc. In addition, the battery cell units can be lithium-ion battery cells, polymer lithium battery cells, lithium iron phosphate battery cells, etc. The embodiment of the present application does not limit the specific shape and specific type of the battery cell units.

[0042] In the embodiment of the present application, the cell module 40 optionally includes a tab 41, which is disposed at the bottom of the cell module 40 and electrically connected to the high-voltage connector 20. The tab 41 is disposed at the bottom of the cell module 40, that is, the cell module 40 in the embodiment of the present application is an inverted cell module. In this way, a more reliable electrical connection is achieved between the cell module 40 and the high-voltage connector 20 through the tab 41 at the bottom.

[0043] Optionally, in the embodiment of the present application, the battery cell assembly further includes a liquid cooling plate 50, which is connected to the notch of the groove 11 of the housing 10, and the liquid cooling plate 50 is arranged above the battery cell module 40 to cool the battery cell module 40. The battery cell module 40 in the embodiment of the present application is an inverted battery cell module, and an explosion-proof valve 42 is provided on the top of the battery cell module 40. The liquid cooling plate 50 is arranged above the battery cell module 40 so that the liquid cooling plate 50 can be arranged relative to the explosion-proof valve 42 on the top of the battery cell module 40, so that when the battery cell module 40 has thermal runaway and high-temperature and high-pressure gas is ejected from the explosion-proof valve 42, the liquid cooling plate 50 can cool the high-temperature and high-pressure gas relatively quickly, thereby reducing the risk of fire.

[0044] In the embodiment of the present application, a spray head 51 is optionally provided on one side of the liquid cooling plate 50 facing the bottom of the groove 11. The spray head 51 is used to spray a cooling medium to cool the battery cell module 40. In other words, the spray head 51 is provided on the inner side of the liquid cooling plate 50, and the cooling medium is sprayed by the spray head 51 to cool the explosion-proof valve 42 on the battery cell module 40.

[0045] Optionally, in the embodiment of the present application, the battery module 40 includes multiple battery cells, and the number of spray heads 51 includes multiple, and the multiple spray heads 51 are arranged at intervals to cool the multiple battery cells separately. In this way, the cooling medium can be sprayed on the multiple battery cells separately through the multiple spray heads 51 to cool them down, further improving the cooling efficiency of the battery module 40.

[0046] For example, in the embodiment of the present application, the cooling medium sprayed by the spray head 51 can be cooling water or cooling air, etc. The embodiment of the present application does not limit the specific type of the cooling medium.

[0047] In the embodiment of the present application, for example, the assembly process of the battery cell assembly can be as follows: first, a foam expansion member is injected into the bottom of the groove 11 of the housing 10. At this time, the foam expansion member is in liquid form, and the injection height of the foam expansion member is flush with the gap h1 between the high-voltage connector 20 and the bottom of the groove 11 of the housing 10, so that the foam expansion member is more evenly distributed and has a better covering and protective effect on the high-voltage connector 20. In addition, the injection height of the foam expansion member can also be set to be greater than the gap h1 between the high-voltage connector 20 and the bottom of the groove 11 of the housing 10, and this embodiment of the present application is not limited to this.

[0048] Then, the inverted cell module is pre-assembled with the high-voltage connector 20 in the groove 11 of the housing 10, so that the tab piece 41 at the bottom of the cell module 40 is connected and assembled with the high-voltage connector 20. Alternatively, the cell module can be pre-assembled with the high-voltage connector 20 in the groove 11 of the housing 10, so that the tab piece 41 at the bottom of the cell module 40 is connected and assembled with the high-voltage connector 20, and then the foam expansion piece is injected into the bottom of the groove 11 of the housing 10. The specific operation steps are not limited in the embodiment of the present application.

[0049] Next, the foam expandable element expands over time, gradually solidifying into a solid structure and effectively encapsulating the high-voltage connector 20, forming a relatively stable and reliable protective structure. At this point, the foam expandable element can be further injected to further enhance the encapsulation effect and further increase the overall rigidity of the battery pack.

[0050] Furthermore, electrical components such as wiring harnesses, copper busbars, and a collection board can be placed on the upper surface of the protective member 30 formed by the expanded foam. Because the distance h2 between the protective member 30 and the notch of the recess 11 is ≥ 1 / 3 the height L of the cell module 40, ample space is reserved for these components, facilitating assembly. Finally, the liquid cooling plate 50 is connected to the notch of the recess 11 of the housing 10, sealing the housing 10.

[0051] In summary, the battery cell assembly of the embodiment of the present application can at least include the following advantages:

[0052] In an embodiment of the present application, the battery cell assembly includes a housing, a high-voltage connector, and a protective member. The housing has a groove, and the high-voltage connector is disposed at the bottom of the groove. The protective member covers the high-voltage connector and is connected to the bottom of the groove to protect the high-voltage connector. In this way, if the battery pack experiences thermal runaway, when the spray head sprays liquid onto the battery cell module, the protective member can protect the high-voltage connector through the protective member, preventing the liquid from flowing into the high-voltage connector and causing a short circuit, thereby improving the battery pack's performance and reducing safety risks.

[0053] An embodiment of the present application also provides a battery pack, which includes the above-mentioned battery cell assembly.

[0054] The battery pack of the embodiment of the present application may have at least the following advantages:

[0055] In an embodiment of the present application, a battery pack includes a cell assembly, which includes: a housing, a high-voltage connector, and a protective member. The housing has a groove, and the high-voltage connector is disposed at the bottom of the groove. The protective member covers the high-voltage connector and is connected to the bottom of the groove to protect the high-voltage connector. In this way, if the battery pack experiences thermal runaway, when the spray head sprays liquid on the cell module, the protective member can protect the high-voltage connector, preventing the spray liquid from flowing to the high-voltage connector and causing a short circuit, thereby improving the performance of the battery pack and reducing safety risks.

[0056] An embodiment of the present application also provides a vehicle, which includes the above-mentioned battery pack or the above-mentioned battery cell assembly.

[0057] For example, in the embodiments of the present application, vehicles may include small cars, medium-sized cars, three-box cars, trucks, trailers, CDVs (Car Derived Vans, vans based on sedan platforms), MPVs (multi-Purpose Vehicles), SUVs (Sport Utility Vehicles), etc. The embodiments of the present application may not limit the specific types of vehicles.

[0058] The vehicle according to the embodiment of the present application may have at least the following advantages:

[0059] In an embodiment of the present application, a vehicle includes a battery pack or cell assembly, which includes a housing, a high-voltage connector, and a protective member. The housing has a groove, and the high-voltage connector is disposed at the bottom of the groove. The protective member covers the high-voltage connector and is connected to the bottom of the groove to protect the high-voltage connector. In this way, if the battery pack experiences thermal runaway, when the spray head sprays liquid on the cell module, the protective member can protect the high-voltage connector, preventing the spray liquid from flowing to the high-voltage connector and causing a short circuit, thereby improving the performance of the battery pack and reducing safety risks.

[0060] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0061] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell assembly, characterized in that: The battery core assembly comprises: a housing (10), a high-voltage connector (20) and a protective member (30); The housing (10) is provided with a groove (11), and the high-voltage connecting piece (20) is arranged at the bottom of the groove (11); The protective member (30) covers the high-voltage connector (20), and the protective member (30) is connected to the bottom of the groove (11) to protect the high-voltage connector (20).

2. The battery core assembly according to claim 1, characterized in that The battery core assembly further includes a battery core module (40), the battery core module (40) being arranged in the groove (11) and connected to the high-voltage connector (20), and the protective member (30) being sealed in contact with the bottom surface and / or peripheral surface of the battery core module (40); The height of the battery cell module (40) is L, the distance between the protective member (30) and the notch of the groove (11) is h2, and h2 and L satisfy: h2≧1 / 3*L.

3. The battery core assembly according to claim 2, characterized in that: The battery cell module (40) includes a pole ear component (41), the pole ear component (41) is arranged at the bottom of the battery cell module (40), and the pole ear component (41) is electrically connected to the high-voltage connector (20).

4. The battery core assembly according to claim 2, characterized in that The battery core assembly further includes a liquid cooling plate (50), the liquid cooling plate (50) being connected to the notch of the groove (11), and the liquid cooling plate (50) being arranged above the battery core module (40) for cooling the battery core module (40).

5. The battery core assembly according to claim 4, characterized in that: A spray head (51) is provided on one side of the liquid cooling plate (50) facing the bottom of the groove (11), and the spray head (51) is used for spraying a cooling medium to cool the battery module (40).

6. The battery core assembly according to claim 5, characterized in that: The battery core module (40) includes a plurality of battery cores, and the number of the spray heads (51) includes a plurality, and the plurality of spray heads (51) are arranged at intervals to cool down the plurality of battery cores respectively.

7. The battery cell assembly according to claim 1, characterized in that The protective member (30) is a foam expansion member.

8. The battery core assembly according to claim 7, characterized in that: The foam expansion element is made of polyurethane.

9. A battery pack, characterized in that: The battery pack includes the battery cell assembly according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle includes the battery pack according to claim 9, or the battery cell assembly according to any one of claims 1 to 8.

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