Battery

Abstract

The utility model relates to a battery. Comprising a box body; the first exhaust valve is arranged on the box body and is configured to exhaust when the air pressure in the box body exceeds a first air pressure threshold value; the plurality of battery cells are arranged in the box body, and each battery cell is provided with an explosion-proof valve which faces the same direction and faces outwards; the battery cell exhaust assembly comprises a supporting plate and a second exhaust valve arranged on the supporting plate; the supporting plate covers one end surfaces, with the anti-explosion valves, of the battery cells; a plurality of second exhaust valves are arranged and correspond to the anti-explosion valves respectively; the second exhaust valve is provided with a valve cover capable of being opened when the air pressure exceeds a second air pressure threshold value and an elastic piece capable of closing the valve cover after exhaust is completed. According to the technical scheme, the safety of the battery can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power batteries, in particular to a battery. BACKGROUND

[0002] A power battery is a storage battery for providing power for high-energy-consumption devices such as electric vehicles and electric tools. Its core features are high energy density, high power output capability and long cycle life, and it is regarded as the "heart" of new energy vehicles. A single power battery is generally referred to as a battery assembly or a battery pack, and the battery assembly is composed of many battery cells.

[0003] A large amount of heat is generated in the battery cells during operation, which needs to be regulated by a thermal management system. For safety considerations, the thermal runaway caused by the failure of the thermal management system needs to be considered. After thermal runaway occurs, high-temperature and high-pressure gas and solid particles are generated, which, if not promptly and effectively discharged from the battery pack, will cause the temperature and pressure inside the battery pack to rise, causing violent reactions or even explosions, posing a risk to the personal safety and property safety of vehicle users. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a battery to solve at least one problem in the background art.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] The present application provides a battery, comprising:

[0007] a box body;

[0008] a first exhaust valve arranged on the box body and configured to exhaust when the air pressure in the box body exceeds a first air pressure threshold;

[0009] a plurality of battery cells arranged in the box body, each of the battery cells having an explosion-proof valve facing in the same direction and outward;

[0010] a battery cell exhaust assembly comprising a support plate and a second exhaust valve arranged on the support plate; the support plate covers one end surface of the plurality of battery cells having the explosion-proof valve; the second exhaust valve is arranged in a plurality of positions corresponding to the explosion-proof valve;

[0011] The second exhaust valve is provided with a valve cover that can be opened when the air pressure exceeds a second air pressure threshold, and an elastic member that can close the valve cover after the exhaust is completed.

[0012] In an optional embodiment, the valve cover covers a deflation area of the explosion-proof valve, and the area of the valve cover in orthographic projection on the direction of the explosion-proof valve is greater than the area of the explosion-proof valve in orthographic projection on the direction.

[0013] In an optional embodiment, the second exhaust valve further comprises a valve body protruding from the support plate, the valve body comprising a pivot arranged on one side of the valve body; the valve cover comprising a connecting portion, the connecting portion and the elastic member being sleeved on the pivot.

[0014] In an optional embodiment, the elastic member comprises a first torsion arm and a second torsion arm, the first torsion arm being connected to the valve body, and the second torsion arm being connected to the valve cover, so as to realize the opening and closing of the valve cover.

[0015] In an optional embodiment, the valve body is further provided with a blocking portion for accommodating the first torsion arm, and the valve cover is provided with an abutting groove for accommodating the second torsion arm.

[0016] In an optional embodiment, a surface of the support plate facing away from the battery cell is provided with an exhaust passage, the exhaust passage being recessed in a portion of the support plate in a direction towards the explosion-proof valve; the exhaust passage being communicated with the explosion-proof valve through the second exhaust valve arranged in the exhaust passage.

[0017] In an optional embodiment, the valve body comprises an exhaust hole and a sealing member groove arranged around the exhaust hole, a sealing ring being arranged in the sealing member groove, and the valve cover being arranged on a side of the exhaust hole facing away from the explosion-proof valve and being sealingly connected with the sealing ring.

[0018] In an optional embodiment, a side of the valve body facing away from the explosion-proof valve is provided with a first accommodating groove for accommodating the valve cover, and a second accommodating groove communicated with the first accommodating groove, the pivot being arranged in the second accommodating groove.

[0019] In an optional embodiment, the exhaust passage extends in a direction towards the first exhaust valve and is communicated with the first exhaust valve.

[0020] In an optional embodiment, in the working state of the battery, the explosion-proof valve and the battery cell exhaust assembly are located at the bottom of the battery cell, and the first exhaust valve is arranged on the side wall of the box body.

[0021] The battery provided by the embodiment of the application comprises: a box body; a first exhaust valve arranged on the box body and configured to exhaust when the air pressure in the box body exceeds a first air pressure threshold; a plurality of battery cells arranged in the box body, wherein each battery cell has a consistent outward explosion-proof valve; and a battery cell exhaust assembly comprising a support plate and a second exhaust valve arranged on the support plate. The support plate covers one end surface of the plurality of battery cells with the explosion-proof valves, and the second exhaust valve is provided with a plurality of second exhaust valves corresponding to the explosion-proof valves. The second exhaust valve is provided with a valve cover that can be opened when the air pressure exceeds a second air pressure threshold, and an elastic element that can close the valve cover after exhaust. It can be seen that the battery of the embodiment of the application is provided with a battery cell exhaust assembly on the one end surface of the battery cell with the explosion-proof valve. The battery cell exhaust assembly comprises a support plate covering the end surfaces of the plurality of battery cells and a second exhaust valve corresponding to the explosion-proof valve. The battery cell exhaust assembly can timely and quickly exhaust the gas and solid particles generated after the thermal runaway of the battery cell. The second exhaust valve is provided with a valve cover, which can reduce the mutual influence of adjacent battery cells and improve the safety of the battery. Therefore, the battery of the embodiment of the application can improve the safety of the battery.

[0022] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings described herein are intended to provide further understanding of the application, form a part of the application, and the illustrative embodiments of the application and their descriptions are used to explain the application, and do not constitute improper limitations on the application. In the drawings:

[0024] Figure 1 A schematic diagram of the battery provided by the embodiment of the application (without the upper cover);

[0025] Figure 2 A schematic diagram of the battery provided by the embodiment of the application (exploded view);

[0026] Figure 3 A schematic diagram of the battery provided by the embodiment of the application without the base;

[0027] Figure 4 A Figure 3 A partial enlarged view of position A in FIG. 6;

[0028] Figure 5 A longitudinal sectional view of the second exhaust valve in the battery provided by the embodiment of the application;

[0029] Figure 6 A Figure 5 A partial enlarged view of position B in FIG. 7;

[0030] Figure 7 A schematic diagram of the valve body of the second exhaust valve in the battery provided by the embodiment of the application;

[0031] Figure 8 Figure 1 is a schematic view of a battery according to an embodiment of the present application; Figure 7 Figure 2 is a schematic view of a local enlarged view at C in Figure 1;

[0032] Figure 9 Figure 3 is another schematic view of a longitudinal section of the battery at the second exhaust valve according to an embodiment of the present application;

[0033] Figure 10 Figure 4 is a schematic view of a support plate in the battery according to an embodiment of the present application;

[0034] Figure 11 Figure 5 is a schematic view of a path of exhaust gas in the battery according to an embodiment of the present application.

[0035] Legend of reference signs:

[0036] 10, box; 11, base; 12, upper cover; 20, first exhaust valve; 30, battery cell; 32, explosion-proof valve; 40, battery cell exhaust assembly; 41, support plate; 411, exhaust passage; 42, second exhaust valve; 421, valve cover; 4211, connecting portion; 4212, abutting groove; 422, valve body; 4221, exhaust hole; 4222, sealing member groove; 4223, first accommodating groove; 4224, second accommodating groove; 4225, blocking portion; 423, elastic member; 4231, first torsion arm; 4232, second torsion arm; 424, pivot. DETAILED DESCRIPTION

[0037] In order to make the technical solutions and beneficial effects of the present application more obvious and easy to understand, the following will be described in detail by way of listing specific embodiments. The drawings are not necessarily drawn to scale, and local features can be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meaning as the technical and scientific terms in the technical field to which the present application belongs.

[0038] In the description of the present application, the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of the simplified description of the present application, and are not intended to indicate that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, i.e. cannot be understood as limiting the present application.

[0039] In the present application, the terms "first", "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc.; except for the explicit specific limitation.

[0040] In the present application, unless otherwise expressly limited, the terms "mount", "connect", "connect", "fix", "set" and the like should be broadly understood. For example, "connection" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise expressly limited, the first feature is "on", "over", "above" and "above" of the second feature, "below", "under", "below" or "below" can be the direct contact of the first feature and the second feature, or the indirect contact of the first feature and the second feature through the intermediate medium. Moreover, the first feature is "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature is "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0042] In order to thoroughly understand the present application, detailed steps and detailed structures will be proposed in the following description in order to explain the technical solutions of the present application. The preferred embodiments of the present application are described in detail as follows, however, in addition to these detailed descriptions, the present application can also have other implementation manners.

[0043] In view of the technical problems in the related art, the embodiments of the present application provide a battery. Referring to Figures 1-4 , the battery comprises:

[0044] The box body 10;

[0045] The first exhaust valve 20 is arranged on the box body 10 and is configured to exhaust when the air pressure in the box body 10 exceeds the first air pressure threshold;

[0046] The plurality of battery cells 30 are arranged in the box body 10, and each battery cell 30 has an explosion-proof valve 32 facing outward.

[0047] The battery cell exhaust assembly 40 comprises a support plate 41 and a second exhaust valve 42 arranged on the support plate; the support plate 41 covers one end surface of a plurality of battery cells 30 having the explosion-proof valve 32; the second exhaust valve 42 is arranged in plurality, corresponding to the explosion-proof valve 32 respectively;

[0048] The second exhaust valve 42 is provided with a valve cover 421 which can be opened when the air pressure exceeds the second air pressure threshold, and an elastic element 423 which can close the valve cover 421 after the exhaust is completed.

[0049] It can be understood that the battery of the embodiment of the application is a power battery, which can be a battery module or a battery pack, and is composed of a plurality of battery cells 30. The battery pack can be in the form of direct integration of battery cells 30, i.e. CTP (Cell To Pack). The box 10 can be rectangular in shape, comprising four side plates, enclosing the box 10.

[0050] It can be understood that the battery cells 30 all have explosion-proof valves 32 facing the same direction outwardly. That is, the explosion-proof valves 32 of the battery cells 30 are all arranged in the same direction. Specifically, the explosion-proof valves 32 can be installed in a manner facing the inner bottom surface of the box 10. This design can improve the overall safety. It can be understood that the explosion-proof valves 32 can face other directions, which does not affect the implementation of the technical solution.

[0051] It can be understood that the above description of the direction is based on the direction of the battery in the normal working state of the electrical equipment, for example, the direction of the power battery in the normal driving of the automobile, and the same applies hereinafter.

[0052] Specifically, the box 10 can comprise a base 11 and an upper cover 12. The base 11 is provided with a containing space for containing the battery cells 30, and the upper cover 12 is used for covering the containing space.

[0053] It can be understood that the support plate 41 can be a whole plate covering one end of the battery cell 30 having the explosion-proof valve 32. Then, in order to facilitate the exhaust of the explosion-proof valve 32, the second exhaust valve 42 is arranged on the whole support plate 41. The number of the second exhaust valve 42 corresponds to the number of the battery cells 30 one by one. The valve cover 421 of the second exhaust valve 42 is subjected to the action of the thermal runaway gas pressure, and is opened when the air pressure exceeds the second air pressure threshold, thereby facilitating the exhaust of the thermal runaway gas. After the exhaust is completed, the air pressure becomes smaller, and the valve cover 421 can be closed by the action of the elastic element 423, so as to close the exhaust passage and prevent foreign matters from entering the battery cell 30.

[0054] The battery of the embodiment of the application is provided with a cell exhaust assembly 40 on one end face of the cell 30 provided with the explosion-proof valve 32, the cell exhaust assembly 40 comprises a support plate 41 covering the end faces of a plurality of cells 30 and a second exhaust valve 42 corresponding to the explosion-proof valve 32, and can timely and quickly exhaust the gas and solid particles generated after thermal runaway of the cell 30, and the second exhaust valve 42 is provided with a valve cover 421, which can reduce the mutual influence of adjacent cells 30 and improve the safety of the battery.

[0055] In some embodiments of the application, the valve cover 421 covers the air leakage area of the explosion-proof valve 32, and the area of the valve cover 421 in the orthographic projection of the explosion-proof valve 32 is greater than the area of the explosion-proof valve 32 in the orthographic projection.

[0056] In this way, the gas exhaust of the explosion-proof valve 32 is smoother. The frequent opening of the explosion-proof valve 32 can also be reduced.

[0057] In some embodiments of the application, with reference to Figure 5 and Figure 6 , the second exhaust valve 42 further comprises a valve body 422 protruding from the support plate 41, the valve body 422 comprises a pivot 424 arranged on one side of the valve body 422; the valve cover 421 comprises a connecting portion 4211, and the connecting portion 4211 and the elastic member 423 are sleeved on the pivot 424.

[0058] In this way, the valve cover 421 can be opened or closed by rotating relative to the pivot 424, which is more stable and reliable. At the same time, the elastic member 423 can stably connect the valve cover 421 and apply an elastic force to the valve cover 421.

[0059] In some embodiments of the application, with reference to Figures 5-9 , the elastic member 423 comprises a first torsional arm 4231 and a second torsional arm 4232 connected to each other, the first torsional arm 4231 is connected to the valve body 422, and the second torsional arm 4232 is connected to the valve cover 421, so as to realize the opening and closing of the valve cover 421.

[0060] In this way, the first torsional arm 4231 is arranged at one end of the elastic member 423, and the second torsional arm 4232 is arranged at the other end of the elastic member 423, so that the elastic force of the elastic member 423 is applied more stably. Specifically, the elastic member 423 is a torsional spring.

[0061] In some embodiments of the application, with reference to Figure 6 , the valve body 422 is further provided with a blocking portion 4225 for accommodating the first torsional arm 4231, and the valve cover 421 is provided with an abutting groove 4212 for accommodating the second torsional arm 4232.

[0062] In this way, during the operation of the elastic member 423, the first torsion arm 4231 and the valve body 422 are relatively fixed, and the second torsion arm 4232 and the valve cover 421 are relatively fixed, so that the operation of the elastic member 423 is more stable.

[0063] In some embodiments of the present application, with reference to Figure 7 and Figure 8 , the valve body 422 comprises an exhaust hole 4221 and a sealing member groove 4222 arranged around the exhaust hole 4221, a sealing ring is arranged in the sealing member groove 4222, and the valve cover 421 is arranged on the side of the exhaust hole 4221 away from the explosion-proof valve 32 and is in sealing connection with the sealing ring.

[0064] By arranging the sealing ring, the valve cover 421 can maintain the sealing of the second exhaust valve 42 after being closed. By arranging the sealing member groove 4222, the position of the sealing ring is more stable and more durable, and the overall reliability is improved.

[0065] In some embodiments of the present application, with reference to Figure 7 and Figure 8 , the side of the valve body 422 away from the explosion-proof valve 32 is provided with a first accommodation groove 4223 for accommodating the valve cover 421, and a second accommodation groove 4224 in communication with the first accommodation groove 4223, and the pivot 424 is arranged in the second accommodation groove 4224.

[0066] In this way, the position of the valve cover 421 after being closed can be more stable. The communication between the first accommodation groove 4223 and the second accommodation groove 4224 can simplify the structure of the connecting part 4211 of the valve cover 421 being sleeved on the pivot 424.

[0067] In some embodiments of the present application, with reference to Figure 3 and Figure 10 , the surface of the support plate 41 away from the battery cell 30 is provided with an exhaust passage 411, and the exhaust passage 411 is recessed in the direction of the explosion-proof valve 32; the exhaust passage 411 is in communication with the explosion-proof valve 32 through the second exhaust valve 42 arranged in the exhaust passage 411.

[0068] That is, the surface of the support plate 41 away from the battery cell 30 comprises exhaust passages 411 arranged in sequence, and the second exhaust valve 42 is arranged in the exhaust passage 411.

[0069] In this way, the gas discharged from the second exhaust valve 42 can flow in order along the recessed exhaust passage 411 and be discharged from the box body 10 more quickly, avoiding interference between adjacent exhaust passages 411.

[0070] In some embodiments of the present application, with reference toFigure 11 The exhaust passage 411 extends in a direction towards the first exhaust valve 20 and communicates with the first exhaust valve 20.

[0071] In this way, the gas discharged from the second exhaust valve 42 can flow to the first exhaust valve 20 more quickly, and can be discharged from the box 10 more quickly. Figure 11 The arrow in the figure indicates the direction of gas flow.

[0072] In some embodiments of the present application, in the working state of the battery, the explosion-proof valve 32 and the cell exhaust assembly 40 are located at the bottom of the cell 30, and the first exhaust valve 20 is arranged on the side wall of the box 10.

[0073] That is, the explosion-proof valve 32 of the cell 30 faces downward. Correspondingly, the cell exhaust assembly 40 needs to be arranged at the bottom of the cell 30.

[0074] The present application also provides a battery as described above.

[0075] The battery of the present application has the cell exhaust assembly 40 arranged at one end surface of the cell 30 having the explosion-proof valve 32, and the cell exhaust assembly 40 includes a support plate 41 covering the end surfaces of a plurality of cells 30 and a second exhaust valve 42 corresponding to the explosion-proof valve 32. The cell exhaust assembly 40 can timely and quickly discharge the gas and solid particles generated after thermal runaway of the cell 30, and the second exhaust valve 42 is provided with a valve cover 421, which can reduce the mutual influence of adjacent cells 30 and improve the safety of the battery.

[0076] It should be understood that the above embodiments are exemplary and are not intended to include all possible embodiments of the technical solutions of the present application. Various modifications and changes can be made to the above embodiments without departing from the scope of the present application. Similarly, any combination of the technical features of the above embodiments can be made to form another embodiment of the present application which has not been explicitly described. Therefore, the above embodiments only express several embodiments of the present application and do not limit the protection scope of the patent of the present application.

Claims

1. A battery, characterized in that, include: Box (10); A first exhaust valve (20) is provided on the housing (10) and configured to exhaust air when the air pressure inside the housing (10) exceeds a first air pressure threshold. Multiple battery cells (30) are arranged inside the housing (10), and each battery cell (30) has an explosion-proof valve (32) facing outwards and with the same orientation. The battery cell venting assembly (40) includes a support plate (41) and a second venting valve (42) disposed on the support plate (41); the support plate (41) covers one end face of a plurality of battery cells (30) having the explosion-proof valve (32); a plurality of second venting valves (42) are provided, each corresponding to the explosion-proof valve (32); The second exhaust valve (42) is provided with a valve cover (421) that can be opened when the air pressure exceeds a second air pressure threshold, and an elastic element (423) that can close the valve cover (421) after exhaust is completed.

2. The battery according to claim 1, characterized in that, The valve cover (421) covers the venting area of ​​the explosion-proof valve (32), and the orthogonal projection area of ​​the valve cover (421) on the orientation of the explosion-proof valve (32) is greater than the orthogonal projection area of ​​the explosion-proof valve (32) on the orientation.

3. The battery according to claim 1, characterized in that, The second exhaust valve (42) further includes a valve body (422) protruding from the support plate, the valve body (422) including a pivot (424) disposed on one side of the valve body (422); the valve cover (421) includes a connecting portion (4211), the connecting portion (4211) and the elastic member (423) being sleeved on the pivot (424).

4. The battery according to claim 3, characterized in that, The elastic element (423) includes a first torsion arm (4231) and a second torsion arm (4232). The first torsion arm is connected to the valve body (422), and the second torsion arm is connected to the valve cover (421) to realize the opening and closing of the valve cover (421).

5. The battery according to claim 4, characterized in that, The valve body (422) is also provided with a blocking part (4225) for receiving the first torsion arm (4231), and the valve cover (421) is provided with an abutment groove (4212) for receiving the second torsion arm (4232).

6. The battery according to claim 1, characterized in that, An exhaust channel (411) is provided on the surface of the support plate (41) facing away from the battery cell (30). The exhaust channel (411) is formed by a portion of the support plate (41) recessed toward the explosion-proof valve (32). The exhaust channel (411) is connected to the explosion-proof valve (32) through the second exhaust valve (42) provided in the exhaust channel (411).

7. The battery according to claim 3, characterized in that, The valve body (422) includes an exhaust port and a sealing groove (4222) surrounding the exhaust port. A sealing ring is provided in the sealing groove (4222). The valve cover (421) covers the side of the exhaust port away from the explosion-proof valve (32) and is sealed to the sealing ring.

8. The battery according to claim 3, characterized in that, The valve body (422) is provided with a first receiving groove (4223) for receiving the valve cover (421) on the side opposite to the explosion-proof valve (32), and a second receiving groove (4224) communicating with the first receiving groove (4223), and the pivot (424) is provided in the second receiving groove (4224).

9. The battery according to claim 6, characterized in that, The exhaust passage (411) extends toward the first exhaust valve (20) and is connected to the first exhaust valve (20).

10. The battery according to any one of claims 1-9, characterized in that, In the working state of the battery, the explosion-proof valve (32) and the cell venting assembly (40) are both located at the bottom of the cell (30), and the first venting valve (20) is disposed on the side wall of the housing (10).

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