Power battery

Abstract

The present application relates to the technical field of batteries, and provides a power battery. The power battery comprises a case, protruding portions, cover plates, explosion-proof valves, and mounting components; the case defines a mounting space; the case has openings in communication with the mounting space; the cover plates cover the openings; the protruding portions protrude from the first case toward the outside of the case in a first direction; the mounting components are connected to the protruding portions; each mounting component is provided with a mounting hole, and the mounting hole is communicated with the mounting space; and the explosion-proof valves are arranged in the mounting holes. According to the power battery of the present application, the path for discharging gas during thermal runaway is separated from a circuit system, thereby improving the safety performance of the power battery. Additionally, the protruding portions protrude from the case, the thickness of the protruding portions only needs to meet welding requirements, the case and the cover plates only need to meet strength requirements of the power battery, and the welding demand thickness of the mounting components does not influence the thickness of the case and the thickness of the cover plates, thereby reducing the weight of the power battery, and improving the energy density of the power battery.

Description

Power Battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 2023216903614, entitled “POWER BATTERY,” filed with the Patent Office of China on June 29, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a power battery. Background Art

[0004] With the rapid development of electric vehicles, consumers are increasingly concerned about the safety of their power batteries. To prevent explosions in the event of thermal runaway, traditional power batteries are equipped with explosion-proof valves on their covers. The valve's opening pressure is lower than the pressure required to cause the battery casing to explode. When the internal pressure of the power battery reaches the valve's opening pressure, the valve opens first, relieving the pressure inside the battery and preventing explosion.

[0005] In existing power batteries, the explosion-proof valve and the pole are integrated on the cover. When the explosion-proof valve is opened, the ejected high-temperature gas and the pole that transmits current share the same plane as the cover. The airflow ejected from the explosion-proof valve will impact the circuit system connected to the pole, thereby affecting the safety of the power battery.

[0006] Furthermore, in existing power batteries, the cover plate has a mounting opening. The portion of the cover plate at the edge of the mounting opening is stamped, making it thinner than the rest of the plate. This creates space for the mounting component to which the explosion-proof valve is attached. To ensure a tight seal after welding the explosion-proof valve, the thickness of the portion of the cover plate at the edge of the mounting opening must be greater than the required welding thickness of the mounting component. This makes the rest of the cover plate thicker, which in turn increases the overall mass of the power battery.

[0007] Application Contents

[0008] In view of this, the present application provides a power battery to solve the problem that the airflow ejected from the explosion-proof valve in the existing power battery will impact the circuit system connected to the pole, thereby affecting the safety of the power battery, and the overall mass of the power battery is large, which affects the energy density of the power battery.

[0009] The present application provides a power battery, comprising a housing, a raised portion, a cover plate, an explosion-proof valve, and a mounting member. The housing encloses a mounting space, the housing has an opening communicating with the mounting space, the cover plate covers the opening, the raised portion protrudes from the first housing along a first direction toward the exterior of the housing, and the mounting member is connected to the raised portion.

[0010] The mounting member is connected to the protruding portion; the mounting member has a mounting hole, the mounting hole is communicated with the mounting space, and the explosion-proof valve is arranged in the mounting hole.

[0011] Furthermore, the mounting member includes a first recessed portion and a second recessed portion, wherein the first recessed portion is located on a side of the mounting member facing the mounting hole, and the second recessed portion is located on a side of the mounting member facing away from the mounting hole;

[0012] The first recessed portion is engaged with the explosion-proof valve, and the second recessed portion is engaged with the raised portion.

[0013] Furthermore, the housing includes two first plates and two second plates, the first plates are alternately connected to the second plates, the first plates are perpendicular to the first direction, the second plates are perpendicular to the second direction, and the first direction is perpendicular to the second direction;

[0014] The surface area of ​​the first plate is smaller than that of the second plate, and the protrusion is arranged on the outer surface of the first plate.

[0015] Furthermore, the thickness of the mounting component is 0.01 mm-10 mm.

[0016] Furthermore, the thickness of the mounting component is 0.1 mm-4 mm.

[0017] Furthermore, the height of the protrusion relative to the first plate is 0.01 mm-50 mm.

[0018] Furthermore, the height of the protrusion relative to the first plate is 0.1 mm-10 mm.

[0019] Furthermore, the cover plate is perpendicular to a third direction, and the third direction is perpendicular to the first direction and the second direction respectively;

[0020] The number of the mounting hole is one, and the distance between the center of the mounting hole and the edge of the first plate in the third direction is greater than or equal to 1 / 4 of the length of the first plate in the third direction.

[0021] Furthermore, the number of the explosion-proof valves is a predetermined number, the predetermined number is greater than or equal to two, the length of the first plate in the third direction is a first value, and the third direction is perpendicular to the first direction and the second direction respectively;

[0022] The distance between the centers of any two of the mounting holes is a second value, and the first value is greater than or equal to the second value divided by a predetermined number plus two.

[0023] Furthermore, the power battery further includes a pole, and the pole is arranged on the cover plate.

[0024] The power battery of the present application includes a housing, a cover plate, an explosion-proof valve, and a mounting member. The housing encloses a mounting space, has an opening communicating with the mounting space, and the cover plate covers the opening. The mounting member protrudes from the housing toward the exterior of the housing. The mounting member has a mounting hole communicating with the mounting space, and the explosion-proof valve is disposed within the mounting hole. Thus, the explosion-proof valve is mounted on the mounting member, which is in turn mounted on the housing. The explosion-proof valve and the terminal are located on different surfaces of the power battery, allowing the explosion-proof valve to be separated from the circuit system connected to the terminal. This, in turn, separates the path for gas release from the circuit system when thermal runaway occurs, thereby improving the safety of the power battery.

[0025] In addition, the raised portion protrudes from the shell. At this time, only the thickness of the raised portion needs to meet the welding requirements, and the shell and the cover plate only need to meet the strength requirements of the power battery. The welding requirement thickness of the mounting component will not affect the thickness of the shell and the cover plate. In this way, the weight of the power battery is reduced, thereby improving the energy density of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] FIG1 is a schematic diagram showing the three-dimensional structure of a power battery according to an embodiment of the present application;

[0028] FIG2 shows an exploded view of a power battery according to an embodiment of the present application;

[0029] FIG3 is a schematic diagram showing a planar structure of a power battery according to an embodiment of the present application;

[0030] FIG4 shows a cross-sectional view of the power battery in FIG3 taken along the line AA′;

[0031] FIG5 shows an enlarged view of portion B in FIG4 ;

[0032] FIG6 shows a schematic diagram of the three-dimensional structure of the explosion-proof valve.

[0033] Figure numerals: 1-shell; 11-first plate; 12-second plate; 2-cover; 3-mounting member; 31-first recess; 32-second recess; 4-explosion-proof valve; 5-pole; 6-raised portion; L1-first direction; L2-second direction; L3-third direction. DETAILED DESCRIPTION

[0034] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0035] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0036] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0037] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0038] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0039] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0040] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0041] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0042] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0043] The power battery of this solution will be described below with reference to FIG1 to FIG5 . In FIG1 to FIG5 , the first direction L1 is the width direction of the power battery, the second direction L2 is the thickness direction of the power battery, and the third direction L3 is the length direction of the power battery.

[0044] As shown in Figures 1 to 5, the power battery includes a housing 1, a cover plate 2, an explosion-proof valve 4, and a mounting member 3. The housing 1 encloses a mounting space and has an opening connected to the mounting space, with the cover plate 2 covering the opening. A protrusion 6 protrudes from the housing 1 toward the exterior of the housing 1, and the mounting member 3 is connected to the protrusion 6. The mounting member 3 has a mounting hole connected to the mounting space, and the explosion-proof valve 4 is disposed in the mounting hole. In this way, the explosion-proof valve 4 is mounted on the mounting member 3, which is mounted on the housing 1. The explosion-proof valve 4 and the terminal 5 are located on different surfaces of the power battery, allowing the explosion-proof valve 4 to be separated from the circuit system connected to the terminal 5. This further separates the path for gas release from the circuit system when thermal runaway occurs in the power battery, improving the safety performance of the power battery.

[0045] In addition, the raised portion 6 protrudes from the shell 1. At this time, only the thickness of the raised portion 6 needs to meet the welding requirements. The shell 1 and the cover plate 2 only need to meet the strength requirements of the power battery. The welding requirement thickness of the mounting component 3 will not affect the thickness of the shell 1 and the cover plate 2. In this way, the weight of the power battery is reduced, thereby improving the energy density of the power battery.

[0046] As shown in Figures 1 and 2, the housing 1 includes two first panels 11 and two second panels 12. The first panels 11 and second panels 12 are alternately connected. The first panels 11 are perpendicular to a first direction L1, and the second panels 12 are perpendicular to a second direction L2, resulting in the housing 1 having a cubic shape. The surface area of ​​the first panels 11 is smaller than that of the second panels 12. The mounting member 3 is disposed on the outer surface of the first panels 11, meaning that the explosion-proof valve 4 is disposed on the side of the housing 1 with the smaller surface area.

[0047] Furthermore, a connection hole is formed in the first plate 11, and the connection hole penetrates the first plate 11 along the first direction L1. The raised portion 6 protrudes toward the exterior of the housing 1 along the first direction L1 relative to the first plate 11. The raised portion 6 and the housing 1 can be integrally formed. The raised portion 6 is arranged along the edge of the connection hole, the mounting member 3 is fixed to the raised portion 6, and the explosion-proof valve 4 is mounted on the mounting member 3. The height of the raised portion 6 relative to the first plate 11 is 0.01mm-50mm, which enables the raised portion 6 to provide sufficient installation space for the mounting member 3 and meet the welding requirements between the raised portion 6 and the mounting member 3.

[0048] Preferably, the height of the protrusion 6 relative to the first plate 11 is 0.1mm-10mm. For example, the height of the protrusion 6 relative to the first plate 11 can be 0.2mm, 0.8mm, 1mm, 3.5mm, 4mm, 7mm or 9mm.

[0049] Furthermore, as shown in Figures 1 and 2, there are two cover plates 2. The housing 1 defines two openings that oppose each other in the third direction L3. The two cover plates 2 are respectively disposed on the two openings to enclose the installation space within which the electrode assembly of the power battery is disposed. The power battery also includes two poles 5, which are disposed on the two cover plates 2, respectively. The two poles 5 are respectively the positive pole and the negative pole.

[0050] In an embodiment of the present application, as shown in Figures 5 and 6, the mounting member 3 includes a first recessed portion 31 and a second recessed portion 32, the first recessed portion 31 is located on the side of the mounting member 3 facing the mounting hole, and the second recessed portion 32 is located on the side of the mounting member 3 facing away from the mounting hole; the first recessed portion 31 is clamped with the explosion-proof valve 4, and the second recessed portion 32 is clamped with the raised portion 6.

[0051] Furthermore, the side facing the interior of the mounting hole is defined as the inner side, and the side facing away from the interior of the mounting hole is defined as the outer side. A first recessed portion 31 is formed on the inwardly facing end of the mounting member 3. The first recessed portion is recessed toward the interior of the mounting member 3 along the second direction L2. A portion of the explosion-proof valve 4 is disposed within the first recessed portion 31 and welded to the mounting member 3, thereby achieving a connection between the explosion-proof valve 4 and the mounting member 3. A second recessed portion 32 is formed on the outwardly facing end of the mounting member 3. The second recessed portion is recessed toward the interior of the mounting member 3 along the second direction L2. A portion of the raised portion 6 is disposed within the second recessed portion 32 and welded to the mounting member 3.

[0052] In an embodiment of the present application, the thickness of the mounting member 3 is 0.01 mm to 10 mm. The mounting member 3 with a thickness within the above range can meet the welding requirements with the raised portion 6 and the explosion-proof valve 4. At the same time, the mounting member 3 can provide sufficient installation space for the explosion-proof valve 4.

[0053] Preferably, the thickness of the mounting member 3 is 0.1 mm-4 mm. For example, the thickness of the mounting member 3 may be 0.3 mm, 0.4 mm, 0.7 mm, 1 mm, 1.6 mm, 1.8 mm or 3 mm.

[0054] In addition, in the embodiment of the present application, the cross-section of the connecting hole can be rectangular, elliptical, etc. The number of explosion-proof valves 4, mounting members 3 and protrusions 6 is the same, and the number of explosion-proof valves 4 can be one, two, three or more.

[0055] The length of the power battery in the third direction L3 of the present application is a first value L, the two edges of the first plate 11 in the third direction L3 are the first edge and the second edge, the distance between the center of the connecting hole and the first edge is the first distance X1, and the distance between the center of the connecting hole and the second edge is the second distance X2. When there is only one explosion-proof valve 4, the distance from the center of the mounting hole to the edge of the first plate 11 in the third direction L3 is greater than or equal to 1 / 4 of the length of the first plate 11 in the third direction L3, that is, X1 ≥ L / 4, and X2 ≥ L / 4. In this way, the explosion-proof valve 4 is located at the center of the first plate 11. When the power battery experiences thermal runaway, the high-temperature gas flows a shorter distance within the housing 1 when it flows out through the explosion-proof valve 4, which can facilitate the high-temperature gas to flow out through the explosion-proof valve 4.

[0056] When the number of explosion-proof valves 4 is a predetermined number n, and the predetermined number S is greater than or equal to two, the distance between the centers of any two mounting holes is a second value M, and the first value L is greater than or equal to the second value M divided by the predetermined number n plus two, i.e., L ≥ M / (n+2). In this way, the predetermined number of explosion-proof valves are evenly distributed on the first plate 11. In the event of thermal runaway of the power battery, high-temperature gases flow out through the closer explosion-proof valves 4, shortening the distance the high-temperature gases travel within the housing 1.

[0057] In the power battery of the present application, the explosion-proof valve 4 is installed on the mounting component 3, the mounting component 3 is installed on the shell 1, and the explosion-proof valve 4 and the pole 5 are located on different surfaces of the power battery, so that the explosion-proof valve 4 can be separated from the circuit system connected to the pole 5, thereby separating the path of gas release when thermal runaway of the power battery from the circuit system, thereby improving the safety performance of the power battery.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. Industrial Applicability

[0059] The power battery provided herein comprises a housing enclosing an installation space, the housing having an opening communicating with the installation space, and a cover plate covering the opening; a mounting member protruding from the housing toward the exterior of the housing; the mounting member having a mounting hole communicating with the installation space, and an explosion-proof valve disposed within the mounting hole. Thus, the explosion-proof valve is mounted on the mounting member, which is in turn mounted on the housing. The explosion-proof valve and the pole are located on different surfaces of the power battery, allowing the explosion-proof valve to be separated from the circuit system connected to the pole. This further separates the path for gas release from the circuit system when thermal runaway of the power battery occurs, thereby improving the safety performance of the power battery.

Claims

1. A power battery, characterized in that: The power battery comprises a shell, a protrusion, a cover plate, an explosion-proof valve and a mounting member, the shell encloses a mounting space, the shell has an opening communicating with the mounting space, the cover plate covers the opening, and the protrusion protrudes from the shell toward the outside of the shell along a first direction; The mounting member is connected to the protruding portion; the mounting member has a mounting hole, the mounting hole is communicated with the mounting space, and the explosion-proof valve is arranged in the mounting hole.

2. The power battery according to claim 1, characterized in that: The mounting member comprises a first recessed portion and a second recessed portion, wherein the first recessed portion is located on a side of the mounting member facing the mounting hole, and the second recessed portion is located on a side of the mounting member facing away from the mounting hole; The first recessed portion is clamped with the explosion-proof valve, and the second recessed portion is clamped with the raised portion.

3. The power battery according to claim 1, characterized in that: The housing comprises two first plates and two second plates, the first plates are alternately connected with the second plates, the first plates are perpendicular to a first direction, the second plates are perpendicular to a second direction, and the first direction is perpendicular to the second direction; The surface area of ​​the first plate is smaller than that of the second plate, and the protrusion is arranged on the outer surface of the first plate.

4. The power battery according to claim 3, characterized in that: The thickness of the mounting component is 0.01 mm-10 mm.

5. The power battery according to claim 4, characterized in that: The thickness of the mounting component is 0.1 mm-4 mm.

6. The power battery according to claim 3, characterized in that: The height of the protrusion relative to the first plate is 0.01mm-50mm.

7. The power battery according to claim 6, characterized in that: The height of the protrusion relative to the first plate is 0.1mm-10mm.

8. The power battery according to claim 3, characterized in that: The cover plate is perpendicular to a third direction, and the third direction is perpendicular to the first direction and the second direction respectively; The number of the mounting hole is one, and the distance between the center of the mounting hole and the edge of the first plate in the third direction is greater than or equal to 1 / 4 of the length of the first plate in the third direction.

9. The power battery according to claim 3, characterized in that: The number of the explosion-proof valves is a predetermined number, the predetermined number is greater than or equal to two, the length of the first plate in the third direction is a first value, and the third direction is perpendicular to the first direction and the second direction respectively; The distance between the centers of any two of the mounting holes is a second value, and the first value is greater than or equal to the second value divided by a predetermined number plus two.

10. The power battery according to any one of claims 1 to 9, characterized in that: The power battery further includes a pole, and the pole is arranged on the cover plate.

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