Battery cover plate and battery module

Abstract

The utility model discloses a battery cover plate and a battery module. The battery cover plate is used for the battery module, the battery module comprises a plurality of battery cells and a battery protection plate, the battery protection plate covers the plurality of battery cells, each battery cell is provided with a pressure relief part, the battery protection plate is provided with avoiding holes corresponding to the pressure relief parts, the battery cover plate covers the battery protection plate, and the battery cover plate comprises a cover plate body, a plurality of exhaust parts are arranged on the cover plate body, and the plurality of exhaust parts and the plurality of pressure relief parts are arranged in a one-to-one correspondence manner; and when the battery cell is in a thermal runaway state, the electrolyte of the battery cell is released from the pressure relief part and is sprayed out towards the exhaust part, so that the exhaust part is stressed to be burst open. The battery module can solve the problem of short circuit of the battery module caused by contact between overflowed electrolyte and other normal battery cells in the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery cover plate and a battery module. Background Art

[0002] A battery module is a module formed by connecting multiple battery cells in series. When designing the battery cells that make up the battery module, in order to prevent the battery cells from exploding due to excessive internal pressure, a pressure relief valve is usually added to the battery cells.

[0003] However, after multiple battery cells are combined to form a battery module, if one battery cell breaks through the pressure relief valve due to pressure and causes electrolyte to overflow, the overflowed electrolyte will flow onto the components of other normal battery cells around it, resulting in a short circuit of the battery module. Summary of the Utility Model

[0004] The main purpose of the present application is to provide a battery cover plate and a battery module to solve the problem in the prior art that the electrolyte overflows and contacts other normal battery cells, resulting in a short circuit of the battery module.

[0005] According to one aspect of the present application, a battery cover plate is provided. The battery cover plate is used for a battery module. The battery module includes multiple battery cells and a battery protection plate. The battery protection plate covers the multiple battery cells. A pressure relief portion is provided on each of the battery cells. An avoidance hole corresponding to the pressure relief portion is provided on the battery protection plate. The battery cover plate covers the battery protection plate. The battery cover plate includes:

[0006] A cover plate body, on which multiple exhaust portions are provided, and the multiple exhaust portions are provided in one-to-one correspondence with the multiple pressure relief portions;

[0007] Wherein, when the battery cell is in a thermal runaway state, the electrolyte of the battery cell is released from the pressure relief portion and sprayed in the direction of the exhaust portion, so that the exhaust portion is forced to be opened.

[0008] Further, the exhaust portion includes a valve body, a connecting rib, and a valve piece. The valve body is installed on the cover plate body, and an opening penetrating the thickness direction of the cover plate body is provided on the valve body. The valve piece covers the opening, and the connecting rib is connected between the valve piece and the valve body.

[0009] Further, there are multiple connecting ribs, and the multiple connecting ribs are arranged at intervals along the outer periphery of the valve piece.

[0010] Further, along the thickness direction of the cover plate body, the thickness of each connecting rib is less than the thickness of the valve piece.

[0011] Further, there is a gap between the outer edge of the valve plate and the edge of the opening, and the connecting rib is located within the gap.

[0012] Further, the valve body and the cover plate body are integrally formed by plastic suction molding; or,

[0013] The valve body is welded to the cover plate body.

[0014] Further, a protective cover is provided on the cover plate body, and the protective cover is at least used to protect the copper bar.

[0015] Further, a plurality of first connecting portions are provided on the cover plate body, a plurality of second connecting portions are provided on the battery protection plate, the plurality of first connecting portions and the plurality of second connecting portions are arranged in one-to-one correspondence, and each of the first connecting portions and each of the second connecting portions are connected by a cable tie.

[0016] Further, a positive electrode identification position and a negative electrode identification position are provided on the battery cover plate.

[0017] On the other hand, the present application also provides a battery module, the battery module includes the above-mentioned battery cover plate, the battery module further includes a plurality of the battery cells and the battery protection plate, a cell identification code is provided on the battery cell, and at least one cell scanning window corresponding to the cell identification code is provided on the battery protection plate.

[0018] In the present application, when actually installing the battery cover plate, it is necessary to first arrange a plurality of battery cells in sequence along the length direction of the battery cover plate, then cover the battery protection plate on the plurality of battery cells to cover the plurality of battery cells, and then install the battery cover plate on the battery protection plate. Since the battery protection plate in the present application is provided with avoidance holes corresponding to the pressure relief portions of each battery cell, that is, there is no blockage at the position corresponding to the pressure relief portion of the battery cell on the battery protection plate, in the event of thermal runaway, high-temperature objects (such as electrolyte) inside the battery cell can be discharged outward. At the same time, since the battery cover plate in the present application is covered on the battery protection plate, and the battery cover plate is provided with exhaust portions corresponding to the pressure relief portions of each battery cell, when the battery cell is in a thermal runaway state, the electrolyte inside the battery cell will break through the pressure relief portion due to excessive internal pressure of the battery cell and spray out in the direction of the exhaust portion, so as to reduce the temperature of the battery cell and achieve the purpose of pressure relief, preventing the battery cell from further occurring more serious safety problems such as explosion. After the sprayed electrolyte and the like wash open the exhaust portion on the battery cover plate, the electrolyte will fall back onto the battery cover plate instead of flowing onto the battery cell or the battery protection plate to contact other normal components and cause a short circuit, effectively improving the safety of the battery module. Description of the Drawings

[0019] The accompanying drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0020] Figure 1 is a schematic structural diagram of a battery cover plate disclosed in an embodiment of the present application;

[0021] Figure 2 is an enlarged view of area A in the attached Figure 1 of the present application;

[0022] Figure 3 is a front view of the battery cover plate disclosed in an embodiment of the present application.

[0023] Among them, the above-mentioned drawings include the following reference numerals:

[0024] 10. Battery cover plate; 11. Cover plate body; 20. Exhaust part; 201. Gap; 21. Valve body; 22. Connecting rib; 23. Valve piece; 30. Protection cover; 40. First connecting part; 50. Positive electrode marking position; 60. Negative electrode marking position. Detailed implementation manners

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0028] As described in the background art, in existing battery modules, a pressure relief valve is usually added to the battery cells to prevent the battery from exploding due to excessive internal pressure of the battery cells. However, when one of the battery cells breaks through the pressure relief valve due to pressure, there will be a situation where the electrolyte overflows, and the overflowing electrolyte will flow onto the components of other normal battery cells around, thus causing a short circuit in the battery module. For this reason, the inventors of the present application have designed a new type of battery cover plate. Through this battery cover plate, the problem that the electrolyte will come into contact with other normal battery cells after overflowing, thus causing a short circuit in the battery module, can be solved. The battery cover plate of the present application will be introduced in detail below with reference to the drawings.

[0029] It should be noted that the "length direction of the battery cover plate 10" in the present application refers to the direction indicated by the letter X in the attached Figure 1 drawings; the "thickness direction of the cover plate body 11" in the present application refers to the direction indicated by the letter Y in the attached Figure 1 drawings.

[0030] See Figures 1 to 3 As shown, according to an embodiment of the present application, a battery cover plate 10 is provided. The battery cover plate 10 is used for a battery module. The battery module includes a plurality of battery cells and a battery protection plate (not shown in the drawings). The battery protection plate covers the plurality of battery cells, and a pressure relief portion (not shown in the drawings) is provided on each battery cell. An avoidance hole (not shown in the drawings) corresponding to the pressure relief portion is provided on the battery protection plate. The battery cover plate 10 covers the battery protection plate. The battery cover plate 10 includes a cover plate body 11, and a plurality of exhaust portions 20 are provided on the cover plate body 11. The plurality of exhaust portions 20 are provided in one-to-one correspondence with the plurality of pressure relief portions; wherein, when the battery cell is in a thermal runaway state, the electrolyte of the battery cell is released from the pressure relief portion and ejected in the direction of the exhaust portion 20, so that the exhaust portion 20 is forced to be opened.

[0031] In this embodiment, when actually installing the battery cover plate 10, a plurality of battery cells need to be arranged in sequence along the length direction of the battery cover plate 10 first, and then the battery protection board is covered on the plurality of battery cells to cover the plurality of battery cells, and then the battery cover plate 10 is installed on the battery protection board. Since the battery protection board in this embodiment is provided with avoidance holes corresponding to the pressure relief parts of each battery cell, that is, there is no obstruction at the position corresponding to the pressure relief part of the battery cell on the battery protection board. In the event of thermal runaway, high-temperature objects (such as electrolyte) inside the battery cell can be discharged outward. At the same time, since the battery cover plate 10 in this embodiment is covered on the battery protection board, and the battery cover plate 10 is provided with exhaust parts 20 corresponding to the pressure relief parts of each battery cell. When the battery cell is in a thermal runaway state, the electrolyte inside the battery cell will break through the pressure relief part due to excessive internal pressure of the battery cell and spray in the direction of the exhaust part 20, so as to reduce the temperature of the battery cell and achieve the purpose of pressure relief, preventing more serious safety problems such as further explosion of the battery cell. After the sprayed electrolyte and the like wash away the exhaust part 20 on the battery cover plate 10, the electrolyte will fall back onto the battery cover plate 10 instead of flowing onto the battery cell or the battery protection board to contact other normal components and cause a short circuit, effectively improving the safety of the battery module.

[0032] That is to say, compared with the battery cover plate in the prior art, in this embodiment, by providing the exhaust part 20 on the battery cover plate 10, the high-temperature objects such as the electrolyte inside the battery cell can be sprayed out when the battery cell undergoes thermal runaway. And since the battery cover plate 10 is covered on the battery protection board, the sprayed high-temperature objects such as the electrolyte will fall on the battery protection board instead of on the battery cell or the battery protection board. In this way, to a certain extent, it prevents the overflowing electrolyte from contacting other components on the battery cell or the battery protection board and causing a short circuit of the battery module, improving the safety of the battery module during use.

[0033] Further, as shown in Figure 2 In the figure, the exhaust part 20 in this embodiment includes a valve body 21, a connecting rib 22 and a valve piece 23. The valve body 21 is installed on the cover plate body 11, and the valve body 21 is provided with an opening (not shown in the drawing) penetrating the thickness direction of the cover plate body 11. The valve piece 23 covers the opening, and the connecting rib 22 is connected between the valve piece 23 and the valve body 21.

[0034] Specifically, the valve body 21 in this embodiment serves as an installation base, and the setting of the valve body 21 ensures that the entire exhaust part 20 can be stably installed on the cover plate body 11. At the same time, the opening provides a channel for high-temperature objects such as electrolyte ejected from the battery cell, enabling the electrolyte to be effectively discharged, preventing the electrolyte from directly flowing onto the battery cell or the battery protection board and coming into contact with other normal components to cause a short circuit. When the exhaust part 20 is not broken through by high-temperature objects such as electrolyte, the setting of the valve piece 23 can prevent other external substances such as dust or water vapor from entering, thus avoiding dust or water vapor from coming into contact with the battery cell to cause a short circuit or affect the performance of the battery cell. The connecting rib 22 can connect the valve piece 23 to the valve body 21, preventing the valve piece 23 from falling off when the exhaust part 20 is not broken through by high-temperature objects such as electrolyte. When the exhaust part 20 is broken open by high-temperature objects such as electrolyte, the connecting rib 22 will break, and thus the valve piece 23 can be pushed open.

[0035] That is to say, the valve piece 23 in this embodiment is connected to the valve body 21 through the connecting rib 22. When the battery cell is in a normal working state, the presence of the valve piece 23 can prevent dust or foreign objects from entering through the opening and coming into contact with the battery cell, thereby protecting the pressure relief part from being damaged by dust or foreign objects and effectively improving the performance of the battery cell. When the battery cell is in a thermal runaway state, the connecting rib 22 will break due to the impact force of high-temperature objects such as electrolyte, and thus the valve piece 23 is broken through so that high-temperature objects such as electrolyte can be ejected from the opening and fall on the battery cover 10, effectively improving the use safety of the battery module.

[0036] Further, as shown in Figure 2 In this embodiment, there are multiple connecting ribs 22, and the multiple connecting ribs 22 are arranged at intervals along the outer periphery of the valve piece 23. With this setting, the multiple connecting ribs 22 can evenly distribute the load, effectively preventing the connecting rib 22 from being disconnected from the valve body 21 due to local overload when the exhaust part 20 is not broken through by high-temperature objects such as electrolyte, and extending the service life of the exhaust part 20 to a certain extent.

[0037] Optionally, the "connecting rib 22" in this embodiment can be set to two, or can be set to three or more. The attached Figure 2 in this embodiment shows the case where the connecting rib 22 is set to three.

[0038] Furthermore, in the thickness direction of the cover plate body 11, the thickness of each connecting rib 22 in this embodiment is smaller than the thickness of the valve plate 23. With such a setting, the structural strength of the connecting rib 22 can be made smaller than that of the valve plate 23, that is, the connecting rib 22 is the weak point of the exhaust part 20. When the exhaust part 20 is subjected to an external force (such as the impact force of high-temperature gas), the connecting rib 22 will break, causing the valve plate 23 to separate from the valve body 21, so that high-temperature objects such as electrolyte can be ejected from the opening and fall on the battery cover plate 10, effectively improving the use safety of the battery module.

[0039] Specifically, when the battery cell undergoes thermal runaway, high-temperature objects such as electrolyte in the battery cell will break through the pressure relief part due to excessive internal pressure of the battery cell and spray out in the direction of the exhaust part 20. During this process, in order to ensure that the valve plate 23 of the exhaust part 20 can be pushed open, in this embodiment, the valve plate 23 is connected to the valve body 21 by using the connecting rib 22, and the thickness of the connecting rib 22 is made smaller than the thickness of the valve plate 23. In this way, it is convenient for the connecting rib 22 to break when the electrolyte sprays out from the battery cell, so that it is convenient for the electrolyte to spray out from the opening.

[0040] Furthermore, as shown in Figure 2 As shown, there is a gap 201 between the outer edge of the valve plate 23 and the edge of the opening in this embodiment, and the connecting rib 22 is located in the gap 201. Specifically, the setting of the gap 201 can reduce the structural strength of the valve plate 23, so that the valve plate 23 will break from the connecting rib 22 when subjected to an external force, thus exposing the opening, and then facilitating the electrolyte to spray out from the opening and fall on the battery cover plate 10.

[0041] Furthermore, in order to improve the structural strength and service life of the exhaust part 20 in this embodiment, the valve body 21 and the cover plate body 11 in this embodiment are integrally formed by thermoforming or the valve body 21 is welded to the cover plate body 11, and the structure is stable and reliable. Of course, in other embodiments of the present application, the valve body 21 and the cover plate body 11 can also be connected by means of screwing, etc. As long as it is other deformation methods under the concept of the present application, they are all within the protection scope of the present application.

[0042] Furthermore, as shown in Figure 1 and Figure 3 As shown, a protective cover 30 is provided on the cover plate body 11 in this embodiment, and the protective cover 30 is at least used to protect the copper busbar. Specifically, since a copper busbar is provided on the battery module and the copper busbar is easily affected by the external environment, such as physical damage, pollution and corrosion, etc., for this reason, a protective cover 30 is provided on the cover plate body 11 in this embodiment. The protective cover 30 can protect the copper busbar, ensure the insulation of the copper busbar at the same time, improve the insulation between the copper busbar and the box body, and extend the service life of the copper busbar.

[0043] Further, referring to Figure 1 and Figure 3 As shown, a plurality of first connection parts 40 are arranged on the cover plate body 11 in this embodiment, and a plurality of second connection parts (not shown in the drawings) are arranged on the battery protection board. The plurality of first connection parts 40 and the plurality of second connection parts are arranged in one-to-one correspondence, and each first connection part 40 and each second connection part are connected by a cable tie. With such an arrangement, the connection strength between the battery cover 10 and the battery protection board is improved, and the first connection part 40 and the second connection part are connected by a cable tie, which simplifies the assembly process of the battery cover 10 and the battery protection board, and has a simple structure, convenient and fast operation.

[0044] Optionally, the "first connection part 40" and the "second connection part" in this embodiment can be set to one, or can be set to two or more. The attached Figure 3 drawings of this embodiment show the case where the first connection part 40 is set to eight.

[0045] Further, referring to Figure 1 As shown, a positive electrode identification position 50 and a negative electrode identification position 60 are arranged on the battery cover 10 in this embodiment. With such an arrangement, it is convenient for users to identify and use the battery module, thereby avoiding damage to the battery module caused by incorrect use, preventing safety accidents from occurring, and improving the use safety of the battery module.

[0046] Combined with the above embodiments, it can be known that in this application, an exhaust part 20 corresponding to the pressure relief part of each battery cell is arranged on the battery cover 10, and the exhaust part 20 is composed of a valve body 21, a valve piece 23 and a connecting rib 22. In this way, when a thermal runaway occurs in the battery cell, high-temperature objects such as the electrolyte in the battery cell can be ejected from the opening and fall back onto the battery cover 10 instead of falling on the battery cell or the battery protection board, thereby avoiding short-circuiting of the battery module caused by the electrolyte contacting other normal components.

[0047] On the other hand, the embodiment of this application also provides a battery module, and this battery module includes the above-mentioned battery cover 10. Therefore, this battery module includes all the technical effects of the above-mentioned battery cover 10. Since the technical effects of the battery cover 10 have been described in detail above, they will not be elaborated here.

[0048] Furthermore, in order to quickly obtain information about each battery cell to achieve monitoring and management of the battery cell status, the battery module in this embodiment further includes a plurality of battery cells and a battery protection board. A battery cell identification code (not shown in the drawings) is provided on the battery cell, and at least one battery cell scanning window corresponding to the battery cell identification code is provided on the battery protection board (not shown in the drawings). Specifically, by scanning the battery cell identification codes on each battery cell, key data such as the production information and performance parameters of each battery cell can be obtained, so that effective battery management and maintenance can be carried out. In this embodiment, at least one battery cell scanning window corresponding to the battery cell identification code is provided on the battery protection board, which facilitates reading the information of the battery cell without disassembling the battery protection board, with a simple structure, convenient and fast operation.

[0049] Optionally, the "battery cell scanning window" in this embodiment can be set to one, or two or more. The present application does not make specific limitations here and can be set according to actual processing requirements.

[0050] For the sake of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will be positioned "below other devices or structures" or "under other devices or structures" afterwards. Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meanings, so they cannot be construed as limiting the protection scope of the present application.

[0052] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cover, the battery cover is used for a battery module, the battery module includes a plurality of battery cells and a battery protection plate, the battery protection plate is covered on the plurality of battery cells, each of the battery cells is provided with a pressure relief portion, the battery protection plate is provided with a avoidance hole corresponding to the pressure relief portion, the battery cover is covered on the battery protection plate, characterized in that: The battery cover comprises: A cover plate body (11), wherein a plurality of exhaust portions (20) are arranged on the cover plate body (11), and the plurality of exhaust portions (20) are arranged in a one-to-one correspondence with the plurality of pressure relief portions; When the battery cell is in a thermal runaway state, the electrolyte of the battery cell is released from the pressure relief portion and sprayed toward the exhaust portion (20), so that the exhaust portion (20) is subjected to force and is flushed open.

2. The battery cover according to claim 1, characterized in that: The exhaust portion (20) comprises a valve body (21), a connecting rib (22) and a valve plate (23); the valve body (21) is mounted on the cover plate body (11), and the valve body (21) is provided with an opening penetrating the cover plate body (11) in the thickness direction; the valve plate (23) covers the opening; and the connecting rib (22) is connected between the valve plate (23) and the valve body (21).

3. The battery cover according to claim 2, characterized in that: There are a plurality of connecting ribs (22), and the plurality of connecting ribs (22) are arranged at intervals along the outer circumference of the valve plate (23).

4. The battery cover according to claim 2, characterized in that: Along the thickness direction of the cover plate body (11), the thickness of each of the connecting ribs (22) is smaller than the thickness of the valve plate (23).

5. The battery cover according to claim 2, characterized in that: There is a gap (201) between the outer edge of the valve plate (23) and the edge of the opening, and the connecting rib (22) is located in the gap (201).

6. The battery cover according to claim 2, characterized in that: The valve body (21) and the cover plate body (11) are integrally formed by vacuum molding; or, The valve body (21) is welded to the cover plate body (11).

7. The battery cover according to any one of claims 1 to 6, characterized in that: A protective cover (30) is provided on the cover plate body (11), and the protective cover (30) is at least used to protect the copper busbar.

8. The battery cover according to any one of claims 1 to 6, characterized in that: A plurality of first connection parts (40) are arranged on the cover plate body (11), and a plurality of second connection parts are arranged on the battery protection plate. The plurality of first connection parts (40) and the plurality of second connection parts are arranged in one-to-one correspondence, and each of the first connection parts (40) and each of the second connection parts are connected by a cable tie.

9. The battery cover according to any one of claims 1 to 6, characterized in that: The battery cover plate is provided with a positive electrode identification position (50) and a negative electrode identification position (60).

10. A battery module, characterized in that: The battery module comprises the battery cover according to any one of claims 1 to 9, and the battery module further comprises a plurality of the battery cells and the battery protection board, the battery cells are provided with battery cell identification codes, and the battery protection board is provided with at least one battery cell scanning window corresponding to the battery cell identification code.

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