Battery protection side plate and battery

Abstract

The utility model relates to the field of battery structures, in particular to a battery protection side plate and a battery. The battery protection side plate is located on the inner side of the shell side wall of the battery, an anti-explosion valve is installed on the shell side wall, and the battery protection side plate comprises a side plate body and a protection piece. An exhaust hole is formed in the side plate main body, and the exhaust hole is opposite to the anti-explosion valve; the protection piece is embedded in the exhaust hole, and the protection piece is matched with the anti-explosion valve; the protection piece is an easy-to-fuse piece, and the protection piece is provided with an easy-to-fuse area. According to the battery protection side plate provided by the invention, the protection part is arranged to support and protect the anti-explosion valve, and when the battery is subjected to thermal runaway, the protection part can be fused, broken and shifted more quickly, so that the exhaust hole is opened quickly, and gas in the battery shell can pass through the exhaust hole and is sprayed out of the anti-explosion valve, so that the internal pressure of the battery is released; and the situation that the vent hole of the explosion-proof valve is blocked due to clamping is avoided, so that the safety of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the field of battery structure, and in particular to a battery protective side plate and a battery. Background Art

[0002] The side plate installed in the side wall of the lithium battery shell is the core component to ensure safety and avoid thermal runaway. For the shell side wall with explosion-proof valve, the existing side plate structure is weak and cannot effectively support the battery cell pole group or protect the explosion-proof valve. Utility Model Content

[0003] The purpose of the present application is to provide a battery protection side plate and a battery, which can play a role in supporting and protecting the explosion-proof valve.

[0004] The present application provides a battery protection side plate, which is located on the inner side of the shell side wall of the battery, the shell side wall is installed with an explosion-proof valve, and the battery protection side plate includes a side plate body and a protection member;

[0005] The side plate body is provided with an exhaust hole, and the exhaust hole is opposite to the explosion-proof valve;

[0006] The protective member is embedded in the exhaust hole, and the protective member is adapted to the explosion-proof valve; the protective member is a fusible member, and the protective member is provided with a fusible zone.

[0007] In the above technical solution, further, the fusible area is located at the edge of the protective member; a plurality of fracture holes are opened at the edge of the protective member, and the plurality of fracture holes are arranged at intervals to form a circle of fracture baseline.

[0008] In the above technical solution, further, the fracture hole is a long hole, and the length direction of the fracture hole is adapted to the extension direction of the contour of the protective element;

[0009] The shape of the break base line is adapted to the contour shape of the protective element.

[0010] In the above technical solution, further, the distances between the edges of the plurality of fracture holes and the edge of the protective element are equal and are all L1, 2mm<L1<5mm.

[0011] In the above technical solution, further, an air passage is provided between the side plate body and the side wall of the shell;

[0012] The protective member is provided with a plurality of first ventilation holes, the plurality of first ventilation holes are arranged at intervals in the area surrounded by the broken baseline, and the plurality of first ventilation holes are communicated with the airway;

[0013] The side plate body is provided with a plurality of second ventilation holes, and the second ventilation holes are arranged at intervals, and the plurality of second ventilation holes are communicated with the air passage.

[0014] In the above technical solution, further, the sum of the cross-sectional areas of the plurality of first vent holes and the plurality of fracture holes is F, the cross-sectional area of ​​the exhaust hole is S,

[0015] In the above technical solution, further, on the side of the side plate body facing the shell side wall, both sides of the side plate body in the width direction are provided with support protrusions, and the length direction of the support protrusions is the length direction of the side plate body, and the support protrusions, the shell side wall and the side plate body are surrounded to form the airway;

[0016] Both ends of the supporting protrusion in the length direction are provided with cut-angle structures.

[0017] In the above technical solution, further, a sink is provided on the side of the exhaust hole facing the explosion-proof valve, or a sink is provided on the side of the exhaust hole facing the battery cell electrode group, and the protective member is embedded in the sink;

[0018] The protective element is connected to the sink through adhesive or hot-melt connection.

[0019] In the above technical solution, further, the thickness of the protective member is H, and 0.3mm<H<0.8mm;

[0020] and / or, the thickness of the side plate body is L2, 0.6 mm < L2 < 1.1 mm;

[0021] And / or, the residual thickness of the sink is L3, 0.3mm<L3<0.5mm.

[0022] The present application also provides a battery, comprising the battery protective side plate described in the above solution.

[0023] Compared with the prior art, the beneficial effects of this application are:

[0024] The battery protection side plate provided in the present application supports and protects the explosion-proof valve by providing a protective part. When the battery experiences thermal runaway, the protective part will melt, break and shift faster, so that the exhaust hole can be opened quickly. The gas inside the battery shell can pass through the exhaust hole and be ejected from the explosion-proof valve, thereby releasing the internal pressure of the battery and avoiding the situation where the exhaust hole of the explosion-proof valve is stuck and blocked, thereby improving the safety of the battery cell.

[0025] The present application also provides a battery, including the battery protection side plate described in the above solution. Based on the above analysis, it can be seen that the battery also has the above beneficial effects, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A first structural schematic diagram of a battery protection side plate provided in this application;

[0028] Figure 2 A second structural schematic diagram of the battery protection side plate provided in this application;

[0029] Figure 3 A schematic diagram of the structure of the protective element provided for this application;

[0030] Figure 4 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0031] Figure 5 for Figure 1 A magnified schematic diagram of point B in the middle.

[0032] In the figure: 101-side plate body; 102-protective member; 103-exhaust hole; 104-fracture hole; 105-sinking platform; 106-first ventilation hole; 107-second ventilation hole; 108-supporting protrusion; 109-cut angle structure; 110-fusible zone. DETAILED DESCRIPTION

[0033] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Embodiment 1

[0037] The battery protection side plate provided in the present application is located on the inner side of the side wall of the battery shell. The side wall of the shell is installed with an explosion-proof valve. When the internal pressure of the battery shell exceeds the set pressure, the gas inside the battery shell will be released through the explosion-proof valve to ensure that the pressure inside the battery will not be too high, thereby avoiding the risk of battery explosion.

[0038] See also Figures 1 to 5 As shown, the battery protection side plate includes a side plate body 101 and a protection member 102. The side plate body 101 is provided with an exhaust hole 103, and the exhaust hole 103 is opposite to the explosion-proof valve; the protection member 102 is embedded in the exhaust hole 103, and the protection member 102 is adapted to the explosion-proof valve; the protection member 102 is a fusible member, and the protection member 102 is provided with a fusible region 110.

[0039] Specifically, when the battery is operating normally, the protective member 102 is installed at the exhaust hole 103. The protective member 102 is opposite to the explosion-proof valve and can support and protect the explosion-proof valve. When the internal pressure of the battery shell exceeds the set pressure, the battery temperature rises. Under the impact of high temperature and high pressure, the protective member 102 will melt, break and shift faster, so that the exhaust hole 103 can be opened quickly. The gas inside the battery shell can pass through the exhaust hole 103 and spray out from the explosion-proof valve, thereby releasing the internal pressure of the battery, avoiding the situation where the exhaust hole 103 of the explosion-proof valve is stuck and blocked, thereby improving the safety of the battery cell.

[0040] It should be noted that the side panel body 101 may be made of injection molding. The protective member 102 and the side panel body 101 may be made of the same or different materials. When the protective member 102 and the side panel body 101 are made of the same material, the protective member 102 may be made to be easier to melt than the side panel body 101 through structural design, such as reducing the thickness of the protective member 102. When the protective member 102 and the side panel body 101 are made of different materials, the protective member 102 may be made to be easier to melt than the side panel body 101 through structural design and / or material selection.

[0041] Furthermore, the protective member 102 is provided with a fusible area 110, and the shape, structure and size of the fusible area 110 can be set so that the protective member 102 after melting has less obstruction on the exhaust hole 103, so that the airflow can be more easily discharged from the exhaust hole 103, thereby improving the smoothness of exhaust and further improving the safety of the battery.

[0042] In an optional solution of this embodiment, the fusible region 110 is located at the edge of the protective member 102; a plurality of fracture holes 104 are provided at the edge of the protective member 102, and the plurality of fracture holes 104 are arranged at intervals to surround a circle of fracture baselines. When the internal pressure of the battery shell exceeds the set pressure, the battery temperature rises, and under the impact of high temperature and high pressure, the area between adjacent fracture holes 104 becomes weaker and more easily fused, and the protective member 102 may be cracked along the fracture baseline formed by the plurality of fracture holes 104. Since the fracture baseline is close to the edge of the protective member 102, the protective member 102 after being broken can expose the exhaust hole 103 to the greatest extent, so that a large amount of airflow can be quickly discharged through the exhaust hole 103.

[0043] Preferably, the fracture hole 104 is an elongated hole, and the length direction of the fracture hole 104 is adapted to the extension direction of the contour of the protective member 102 ; the shape of the fracture baseline is adapted to the contour shape of the protective member 102 .

[0044] In this embodiment, if Figure 1 As shown, since the shape of the explosion-proof valve is an oval circle, the exhaust hole 103 and the protective member 102 installed on the exhaust hole 103 are also set to an oval circle, and the shape of the fracture baseline is also set to an oval circle. At the straight edge position of the oval-shaped fracture baseline, the fracture hole 104 is a rectangular hole, and the length direction of the fracture hole 104 is the length direction of the straight edge; at the arc edge position of the oval-shaped fracture baseline, the fracture hole 104 is a fan-shaped hole, and the curvature of the fan ring is adapted to the curvature of the arc edge. The setting of the fracture hole 104 as a long strip hole enables the protective member 102 to break along the length direction of the fracture hole 104 under the impact of high temperature and high pressure. The fracture position, shape and range of the protective member 102 can be controlled by arranging the fracture hole 104.

[0045] In the optional solution of this embodiment, Figure 3As shown, the distances between the edges of the multiple fracture holes 104 and the edges of the protective member 102 are equal and are all L1, 2mm<L1<5mm. The distances between the edges of the fracture holes 104 and the edges of the protective member 102 are within the above range, which can ensure that the protective member 102 has sufficient strength when the battery is in normal operation; when the pressure inside the battery shell exceeds the set pressure, the protective member 102 can also be broken in time to reveal the exhaust hole 103.

[0046] In an optional solution of this embodiment, a sink 105 is provided on the side of the exhaust hole 103 facing the explosion-proof valve, or a sink 105 is provided on the side of the exhaust hole 103 facing the battery cell group. When the protective member 102 is placed in the exhaust hole 103, when the protective member 102 abuts against the sink 105, it means that the protective member 102 is installed in place, and the installation operation of the protective member 102 is easier. The protective member 102 is embedded in the sink 105, and the protective member 102 is connected to the sink 105 by glue or hot melt. When installing the battery protective side panel, for the structure where the protective member 102 is located below the side panel body 101, the protective member 102 is easily detached from the exhaust hole 103 of the side panel body 101 due to gravity, and the protective member 102 is further connected to the sink 105 by glue or hot melt, so that the protective member 102 can be reliably installed in the exhaust hole 103.

[0047] like Figure 5 As shown, in the optional scheme of this embodiment, the thickness of the protective member 102 is H, and 0.3mm<H<0.8mm; and / or the thickness of the side plate body 101 is L2, 0.6mm<L2<1.1mm; and / or the residual thickness of the sink 105 is L3, 0.3mm<L3<0.5mm. The parameters of the protective member 102 and the sink 105 are within the above range, which can ensure that the protective member 102 has sufficient strength when the battery is operating normally, and the protective member 102 is reliably connected to the side plate body 101. When the internal pressure of the battery housing exceeds the set pressure, the protective member 102 can also be melted, broken and shifted in time to reveal the exhaust hole 103.

[0048] Embodiment 2

[0049] The battery protection side plate in the second embodiment is an improvement on the above embodiment, and the technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in the second embodiment.

[0050] In an optional scheme of this embodiment, an air duct is arranged between the side panel body 101 and the side wall of the shell; the protective member 102 is provided with a plurality of first air vents 106, the plurality of first air vents 106 are arranged at intervals in the area enclosed by the broken baseline, and the plurality of first air vents 106 are connected to the air duct; the side panel body 101 is provided with a plurality of second air vents 107, the plurality of second air vents 107 are arranged at intervals, and the plurality of second air vents 107 are connected to the air duct.

[0051] In this embodiment, no matter when the pressure at any position inside the battery casing exceeds the set pressure, the internal gas can be gathered into the airway through the multiple first vents 106 opened in the protective member 102, the multiple second vents 107 opened in the side plate body 101, and the exhaust holes 103, and the gathered gas can eventually be discharged through the explosion-proof valve, thereby improving the safety of the battery.

[0052] In an optional solution of this embodiment, the sum of the cross-sectional areas of the plurality of first vent holes 106 and the plurality of fracture holes 104 is F, and the cross-sectional area of ​​the exhaust hole 103 is S. In this way, it can be ensured that when the battery is operating normally, the strength of the protective member 102 will not be affected by too many holes; when the internal pressure of the battery shell exceeds the set pressure, the protective member 102 can not only break in time to reveal the exhaust hole 103, but the first vent hole 106 of the protective member 102 can also play a role in exhausting.

[0053] In an optional scheme of this embodiment, on the side of the side panel body 101 facing the shell side wall, support protrusions 108 are provided on both sides in the width direction of the side panel body 101, and the length direction of the support protrusion 108 is the length direction of the side panel body 101, and the support protrusion 108, the shell side wall and the side panel body 101 are arranged to form an airway; corner cutting structures 109 are provided at both ends in the length direction of the support protrusion 108.

[0054] In this embodiment, when the explosion-proof valve is installed on the side wall of the housing, part of the structure will extend into the side wall of the housing. Due to the existence of the support protrusion 108, a certain space can be separated between the side wall of the housing and the side plate body 101, and the side plate body 101 will not directly contact the explosion-proof valve, which can prevent the explosion-proof valve from being blocked by the side plate body 101. In addition, the two ends of the support protrusion 108 are provided with a cut-angle structure 109 so that the sharp corners of the end of the support protrusion 108 will not scratch the battery housing, further improving the safety of the battery.

[0055] Embodiment 3

[0056] Embodiment 3 of the present application provides a battery, including the battery protection side plate of any of the above embodiments, and thus has all the beneficial technical effects of the battery protection side plate of any of the above embodiments, which will not be repeated here.

[0057] 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 is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In addition, a person skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means being within the scope of the present application and forming different embodiments.

Claims

1. A battery protective side plate, located on the inner side of the battery housing side wall, the housing side wall is installed with an explosion-proof valve, characterized in that: The battery protection side plate comprises a side plate body and a protection member; The side plate body is provided with an exhaust hole, and the exhaust hole is opposite to the explosion-proof valve; The protective member is embedded in the exhaust hole, and the protective member is adapted to the explosion-proof valve; the protective member is a fusible member, and the protective member is provided with a fusible zone.

2. The battery protection side plate according to claim 1, characterized in that: The fusible zone is located at the edge of the protective member; a plurality of fracture holes are opened at the edge of the protective member, and the plurality of fracture holes are arranged at intervals to form a circle of fracture baseline.

3. The battery protection side plate according to claim 2, characterized in that: The fracture hole is a long hole, and the length direction of the fracture hole is adapted to the extension direction of the contour of the protective element; The shape of the break base line is adapted to the contour shape of the protective element.

4. The battery protection side plate according to claim 3, characterized in that: The distances between the edges of the plurality of fracture holes and the edge of the protective element are equal and are all L1, 2mm<L1<5mm.

5. The battery protection side plate according to claim 2, characterized in that: An air passage is provided between the side plate body and the shell side wall; The protective member is provided with a plurality of first ventilation holes, the plurality of first ventilation holes are arranged at intervals in the area surrounded by the broken baseline, and the plurality of first ventilation holes are communicated with the airway; The side plate body is provided with a plurality of second ventilation holes, and the second ventilation holes are arranged at intervals, and the plurality of second ventilation holes are communicated with the air passage.

6. The battery protection side plate according to claim 5, characterized in that: The sum of the cross-sectional areas of the first ventilation holes and the fracture holes is F, and the cross-sectional area of ​​the exhaust hole is S.

7. The battery protection side plate according to claim 5, characterized in that: On the side of the side plate body facing the shell side wall, both sides of the side plate body in the width direction are provided with support protrusions, and the length direction of the support protrusions is the length direction of the side plate body, and the support protrusions, the shell side wall and the side plate body are surrounded to form the airway; Both ends of the supporting protrusion in the length direction are provided with cut-angle structures.

8. The battery protection side plate according to claim 1, characterized in that: A sink is provided on the side of the exhaust hole facing the explosion-proof valve, or a sink is provided on the side of the exhaust hole facing the battery cell group, and the protective member is embedded in the sink; The protective element is connected to the sink through adhesive or hot-melt connection.

9. The battery protection side plate according to claim 8, characterized in that: The thickness of the protective member is H, and 0.3mm<H<0.8mm; and / or, the thickness of the side plate body is L2, 0.6 mm < L2 < 1.1 mm; And / or, the residual thickness of the sink is L3, 0.3mm<L3<0.5mm.

10. A battery, characterized in that: The invention comprises the battery protection side plate as claimed in any one of claims 1 to 9.

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