Battery pack and vehicle

Abstract

The utility model discloses a battery pack which comprises a battery cell module and an explosion-proof valve, the battery pack further comprises an isolation plate and a cover plate, the isolation plate is arranged on the battery cell module, a plurality of isolation through holes are formed in the isolation plate, the cover plate is arranged on the side, away from the battery cell module, of the isolation plate, and the explosion-proof valve is arranged on the side, away from the battery cell module, of the isolation plate. The cover plate is attached to the circumferential outer portion of the isolation port to form an isolation area, the isolation port and the explosion-proof valve are arranged correspondingly, an embedded part is arranged in the isolation port, and the embedded part is attached to the circumferential edge of the explosion-proof valve to form a high-temperature-resistant gas flowing channel. According to the utility model, when the battery cell module is subjected to thermal runaway, the isolation plate can effectively perform thermoelectric isolation, so that the safety performance of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and in particular to a battery pack and a vehicle. Background Technology

[0002] With the continuous development of new energy vehicles, the performance requirements for power battery packs are also gradually increasing. Existing power battery packs adopt an integrated cell module arrangement. When thermal runaway occurs, the electrolyte ejected from the explosion-proof valve of a single cell has a large impact force under its internal pressure. The generated high-temperature gas can melt the surrounding plates and affect other electrical components installed on the plates, posing a significant safety problem. The overall safety performance of the power battery pack needs to be improved. Utility Model Content

[0003] The purpose of this utility model is to solve the aforementioned technical problems by providing a battery pack and vehicle, thereby enabling the separator to effectively isolate the battery pack thermally when thermal runaway occurs in the cell module, thus improving the safety performance of the battery pack. To achieve the above objective, the technical solution of this utility model is as follows:

[0004] A battery pack includes a cell module and an explosion-proof valve. The battery pack also includes an isolation plate and a cover plate. The isolation plate is disposed on the cell module and has several isolation openings. The cover plate is disposed on the side of the isolation plate away from the cell module and is attached to the circumferential outer side of the isolation openings to form an isolation zone. The isolation openings are correspondingly disposed to the explosion-proof valve. An insert is disposed inside the isolation opening and is attached to the circumferential edge of the explosion-proof valve to form a high-temperature resistant gas flow channel.

[0005] Specifically, the insert conforms to the isolation port, and the insert is made of a high-temperature resistant material.

[0006] Specifically, the isolation plate includes a first isolation part and a second isolation part connected together. The first isolation part is attached to the cover plate to form the isolation area, and the second isolation part and the cover plate form an accommodating cavity.

[0007] Specifically, an isolation element is provided at the connection between the isolation area and the accommodating cavity to separate the isolation area from the accommodating cavity.

[0008] Specifically, the isolation element is disposed on the first isolation part and / or the cover plate, and the first isolation part and the cover plate are in contact to compress and deform the isolation element.

[0009] Specifically, a busbar is provided on the second isolation section, and the busbar is electrically connected to the battery cell module.

[0010] Specifically, the cavity contains circuit devices, which are electrically connected to the busbar and the battery cell module.

[0011] Specifically, the cover plate is provided with a plurality of exhaust sections, which are provided in correspondence with the isolation opening.

[0012] Specifically, the exhaust section is provided with a plurality of exhaust holes, and / or the exhaust section is configured as a partially thinned area relative to the cover plate.

[0013] The vehicle, including the aforementioned battery pack.

[0014] Compared with the prior art, the beneficial effects of this utility model battery pack and vehicle are mainly reflected in:

[0015] The isolation port has an embedded component attached to the circumferential edge of the explosion-proof valve to form a high-temperature resistant gas flow channel. This channel guides the high-temperature, high-pressure gas ejected from the explosion-proof valve to escape, preventing the gas from melting the isolation port and spreading to the electrical components around the isolation plate, thus achieving effective thermoelectric isolation and preventing the rapid spread of thermal runaway. Attached Figure Description

[0016] Figure 1 An exploded view of the battery pack is provided for the embodiments of this application;

[0017] Figure 2 An exploded view of the isolation plate and the cell module is provided for the embodiments of this application;

[0018] Figure 3 A schematic diagram of two battery cell modules located on opposite sides is provided for an embodiment of this application.

[0019] Figure label:

[0020] Battery module 1, individual battery cell 11, explosion-proof valve 12;

[0021] 2. Isolation plate; 21. Isolation opening; 22. Embedded part; 23. First isolation part; 24. Second isolation part; 25. Through hole;

[0022] Cover plate 3, exhaust section 31, exhaust hole 32;

[0023] 41. Isolation zone; 42. Reception cavity; 43. Isolation component;

[0024] Busbar 5;

[0025] Circuit component 6, connecting piece 61. Detailed Implementation

[0026] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0027] Example 1

[0028] This embodiment provides a battery pack, including a cell module 1, which is disposed within the battery pack housing. The cell module 1 includes a plurality of individual cells 11. Each individual cell 11 is equipped with an explosion-proof valve 12. When a single cell 11 experiences thermal runaway, the electrolyte inside the cell 11 is ejected through the explosion-proof valve 12 due to pressure. The resulting high-temperature gas affects other electrical components surrounding the cell module 1. This embodiment improves the battery pack to achieve thermal and electrical isolation, which will be described in detail below.

[0029] like Figures 1-3 As shown, the battery pack also includes an isolation plate 2 and a cover plate 3.

[0030] An isolation plate 2 is disposed on the cell module 1, and the isolation plate 2 is provided with a plurality of isolation openings 21. A cover plate 3 is disposed on the side of the isolation plate 2 away from the cell module 1, and the cover plate 3 is provided with a plurality of exhaust parts 31. The cover plate 3 and the isolation plate 2 are attached to the circumferential outer side of the isolation openings 21 to form an isolation zone 41. The explosion-proof valve 12, the isolation openings 21 and the exhaust parts 31 correspond to each other. An insert 22 is disposed inside the isolation opening 21. The insert 22 is attached to the circumferential edge of the explosion-proof valve 12 to form a high-temperature resistant gas flow channel.

[0031] The insert 22 conforms to the isolating port 21 to ensure a tight connection between the insert 22 and the isolating port 21, preventing the insert 22 from detaching from the isolating port 21. The insert 22 is made of a high-temperature resistant material, which can improve the circumferential structural strength and high-temperature resistance of the isolating port 21, preventing the isolating port 21 from melting. The insert 22 and the isolating port 21 can be fixed by snap-fitting, welding, bonding, or integral connection.

[0032] When thermal runaway occurs inside the single cell 11, high-temperature and high-pressure gas is ejected from the explosion-proof valve 12 and smoothly discharged from the exhaust section 31 through the guidance of the embedded part 22. This avoids the failure of the isolation zone 41 caused by the melting of the isolation port 21 by the high-temperature and high-pressure gas, thereby improving the safety function of the isolation zone 41 and effectively exerting the thermoelectric isolation function of the isolation zone 41.

[0033] The number of battery cell modules 1 can be one or more; the battery cell module 1 includes several individual battery cells 11, which can be stacked and connected sequentially with the surface containing the largest cross-section as the joint surface to form the battery cell module 1. Adjacent individual modules can be fixed together by structural adhesive, so that the several individual battery cells 11 are fixed side by side. The explosion-proof valves 12 on the several individual battery cells 11 are arranged in the same straight line direction.

[0034] The isolation plate 2 includes a first isolation part 23 and a second isolation part 24 connected together. The first isolation part 23 is abutted and connected to the end face of the battery cell module 1. The connection method can be welding, bonding or riveting. In this embodiment, the first isolation part 23 is bonded and fixed to the end face of the battery cell module 1.

[0035] A busbar 5 is provided on the second isolation section 24. The busbar 5 is electrically connected to the cell module 1 and to the terminal of the individual cell 11. The busbar 5 enables all the individual cells 11 in the cell module 1 to be connected in series, specifically, the busbar 5 is welded to the terminal of the individual cell 11. The second isolation section 24 serves to support and fix the busbar 5. The isolation plate 2 is made of insulating material, and the busbar 5 can be embedded in the second isolation section 24 without affecting the electrical connection between the busbar 5 and the individual cell 11.

[0036] The first isolation section 23 abuts against the cover plate 3 to form an isolation zone 41. The first isolation section 23 is provided with a plurality of isolation openings 21, the arrangement of which corresponds to the arrangement of the explosion-proof valve 12. The diameter of the isolation openings 21 is greater than or equal to the diameter of the explosion-proof valve 12, allowing the high-temperature gas ejected from the explosion-proof valve 12 to be smoothly discharged through the isolation openings 21. The first isolation section 23 and the cover plate 3 can be connected by welding, bonding, or riveting. In this embodiment, the first isolation section 23 is bonded and fixed to the cover plate 3.

[0037] A cavity 42 is formed between the second isolation section 24 and the cover plate 3. A circuit device 6 is disposed within the cavity 42, and the circuit device 6 is electrically connected to the busbar 5 and the individual battery cell 11. In this embodiment, the circuit device 6 is a circuit board. The second isolation section 24 has several vias 25. One end of the circuit device 6 is directly connected to the busbar 5 via a connecting piece 61, and the other end of the circuit device 6 is connected to the individual battery cell 11 via the connecting piece 61 through the via 25. In this embodiment, the connecting piece 61 is a nickel plate. The circuit device 6 can collect the voltage signal of the battery cell module 1 through the nickel plate, which can be fixed to the busbar 5 and the individual battery cell 11 by soldering.

[0038] To further enhance the thermoelectric isolation effect of the isolation zone 41, an isolation element 43 is provided at the connection between the isolation zone 41 and the accommodating cavity 42. The isolation element 43 can be installed on the cover plate 3 or on the first isolation part 23. The isolation element 43 can be installed by hot riveting or bonding. When the cover plate 3 is close to the first isolation part 23, the isolation element 43 can be elastically compressed and deformed, thus separating the isolation zone 41 from the accommodating cavity 42. In this embodiment, the isolation element 43 is foam. Foam has the characteristic of high temperature resistance. When the foam is compressed and deformed, the compression of the foam is used to prevent the high-temperature gas from entering the accommodating cavity 42 from the isolation zone 41 during thermal runaway of the single cell 11, thereby protecting the electrical components in the accommodating cavity 42 and preventing arcing from the busbar 5 and circuit board.

[0039] The cover plate 3 is made of a high-temperature resistant material, such as mica. The cover plate 3 is provided with several exhaust parts 31. The exhaust parts 31 and the cover plate 3 can be an integral structure or a separate structure. The thickness of the exhaust parts 31 is less than the thickness of the cover plate 3. The exhaust parts 31 are local thinning areas on the cover plate 3.

[0040] Several vent holes 32 can be provided on the vent section 31 to weaken the local strength of the vent section 31; alternatively, vent holes 32 can be provided on the basis of the vent section 31 being a locally thinned area. When a single battery cell 11 experiences thermal runaway, the high-pressure gas breaks through the vent section 31. By providing vent holes 32 and / or locally thinning the vent section 31, the high-pressure gas can be slowed down, preventing it from rushing directly from the vent section 31 to the opposite battery cell module 1, thus protecting the opposite battery cell module 1 and improving the overall safety of the battery pack.

[0041] In this embodiment, an insert 22 is provided inside the isolation port 21. The insert 22 is attached to the circumferential edge of the explosion-proof valve 12 to form a high-temperature resistant gas flow channel. This prevents the high-temperature and high-pressure gas from melting the isolation port 21 and spreading to the electrical components around the isolation plate 2, thus avoiding any impact. The gas flow channel can guide the high-temperature and high-pressure gas ejected from the explosion-proof valve 12 to be discharged directly from the exhaust part 31 of the cover plate 3, achieving effective thermoelectric isolation and preventing the rapid spread of thermal runaway.

[0042] Example 2

[0043] This embodiment provides a vehicle that includes the battery pack described in the above embodiment, and therefore has the same characteristics as the battery pack described above. To avoid repetition, it will not be described again here.

[0044] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of those features. In the description of this application, "some" means at least two, such as two, three, etc., unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "joined," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0047] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A battery pack, comprising a cell module (1) and an explosion-proof valve (12), characterized in that: The battery pack also includes an isolation plate (2) and a cover plate (3). The isolation plate (2) is disposed on the cell module (1). An isolation port (21) is provided on the isolation plate (2). The cover plate (3) is disposed on the side of the isolation plate (2) away from the cell module (1). The cover plate (3) abuts against the circumferential outside of the isolation port (21) to form an isolation area (41). The isolation port (21) is correspondingly disposed with the explosion-proof valve (12). An insert (22) is provided inside the isolation port (21). The insert (22) is attached to the circumferential edge of the explosion-proof valve (12) to form a high-temperature resistant gas flow channel.

2. The battery pack according to claim 1, characterized in that: The insert (22) conforms to the isolation port (21) and is made of a high-temperature resistant material.

3. The battery pack according to claim 1, characterized in that: The isolation plate (2) includes a first isolation part (23) and a second isolation part (24) connected together. The first isolation part (23) abuts against the cover plate (3) to form the isolation area (41), and the second isolation part (24) forms a receiving cavity (42) between the cover plate (3).

4. The battery pack according to claim 3, characterized in that: An isolation element (43) is provided at the connection between the isolation area (41) and the accommodating cavity (42) to separate the isolation area (41) and the accommodating cavity (42).

5. The battery pack according to claim 4, characterized in that: The isolation element (43) is disposed on the first isolation part (23) and / or the cover plate (3), and the first isolation part (23) and the cover plate (3) are pressed together to compress the isolation element (43) to deform.

6. The battery pack according to claim 3, characterized in that: The second isolation section (24) is provided with a busbar (5), which is electrically connected to the battery cell module (1).

7. The battery pack according to claim 6, characterized in that: The accommodating cavity (42) is provided with a circuit device (6), which is electrically connected to the bus (5) and the battery cell module (1).

8. The battery pack according to claim 1, characterized in that: The cover plate (3) is provided with an exhaust section (31), which is provided in correspondence with the isolation port (21).

9. The battery pack according to claim 8, characterized in that: The exhaust section (31) is provided with an exhaust hole (32), and / or the exhaust section (31) is configured as a partially thinned area relative to the cover plate (3).

10. A vehicle, characterized in that: Includes the battery pack as described in any one of claims 1-9.

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