Battery side plate and battery

Abstract

The present application relates to the technical field of batteries, and discloses a battery side plate and a battery. The battery side plate is integrally injection-molded. The battery side plate comprises a side plate body and support protrusions disposed on the side plate body, a plurality of support protrusions being arranged at intervals in the length direction of the side plate body. The support protrusions are adapted to be supported on and abut against the inner wall of the battery casing, so as to form an exhaust channel allowing an airflow to circulate between every two adjacent support protrusions. The battery comprises an electrode assembly, a battery casing and explosion-proof valves, the explosion-proof valves being mounted on the side wall of one side of the battery casing, and the battery side plate being located between the electrode assembly and the explosion-proof valves. According to the battery side plate provided by the present application, the gap between every two adjacent support protrusions forms an exhaust channel allowing an airflow to circulate in the accommodating cavity of the battery casing and the space between the side plate body and the explosion-proof valves, thereby being more conducive to rapid discharge of gas in the battery, and avoiding the problem of unsmooth airflow circulation due to the battery side plate being tightly attached to the inner wall of the battery casing.

Description

Battery side panel and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on June 28, 2023, with application number 202321674990.8 and invention name “Battery side plate and battery”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0004] As lithium-ion battery technology matures, it's widely used as a power battery in electric vehicles and energy storage, leading to increasingly stringent requirements for performance and safety. When a lithium-ion battery experiences abnormal conditions such as a short circuit, overcharge, or over-discharge, chemical reactions occur between the various materials within the battery, generating significant heat and causing thermal runaway. This generates a large amount of high-temperature gas, causing a sharp increase in pressure within the battery, potentially leading to deformation and even explosion.

[0005] To prevent gas accumulation inside the battery and potentially causing an explosion, those skilled in the art typically install an explosion-proof valve in the battery casing. When the internal pressure of the battery becomes excessive, the valve opens and ruptures, expelling gas from the electrode assembly to relieve pressure, thereby preventing explosion and ensuring personal and property safety. For longer batteries, the explosion-proof valve is located on the side of the battery casing, with a battery side plate placed between the electrode assembly and the explosion-proof valve to protect the electrode assembly. The battery side plate is a core component for preventing thermal runaway.

[0006] However, the existing battery side plate structure is simple and can only play a supporting and protective role. It has almost no effect on improving the thermal runaway inside the electrode group, is not conducive to the discharge of gas inside the electrode group, and is prone to thermal runaway of the electrode group caused by airway blockage.

[0007] Summary of the Invention

[0008] In view of this, the present application provides a battery side plate and a battery to solve the problem that the battery side plate in the prior art has a single structure and can only play a supporting and protective role, but has almost no effect on improving the thermal runaway inside the electrode group, is not conducive to the discharge of gas inside the electrode group, and is prone to thermal runaway of the electrode group due to airway blockage.

[0009] In the first aspect, the present application provides a battery side plate, which is arranged between the pole group and the battery shell, and the battery side plate is integrally injection molded. The battery side plate includes a side plate body and a support protrusion protruding on a side of the side plate body away from the pole group, and the support protrusion includes a plurality of support protrusions arranged at intervals along the length direction of the side plate body; the support protrusion is suitable for supporting and abutting against the inner wall of the battery shell after the battery side plate, the pole group and the battery shell are assembled, so as to form an exhaust channel for airflow between two adjacent support protrusions.

[0010] Beneficial effect: By providing a plurality of support protrusions at intervals on the side plate body, after the electrode group, the battery side plate and the battery shell are assembled, they can be supported against the inner wall of the battery shell, thereby supporting and protecting the electrode group, and the gap between two adjacent support protrusions forms an exhaust channel for airflow, which is more conducive to the rapid discharge of gas inside the battery and avoids the problem of the battery side plate being tightly attached to the inner wall of the shell and poor airflow.

[0011] In an optional embodiment, the supporting protrusions are respectively provided on both side edges of the side panel body along the length direction.

[0012] Beneficial effects: By providing support protrusions on both side edges of the side panel body, support can be provided from both sides, thereby improving the stability of the cooperation between the battery side panel and the battery shell. At the same time, exhaust channels can be formed on both sides of the side panel body to improve the airflow distribution of the battery side panel, thereby effectively preventing the phenomenon of thermal runaway of the electrode group due to airway blockage.

[0013] In an optional embodiment, the side panel body includes end areas located at both ends and a middle area arranged between the two end areas, and the support protrusion includes a first support protrusion and a second support protrusion, and there are multiple first support protrusions, and the multiple first support protrusions are evenly spaced and arranged in the middle area of ​​the side panel body; the second support protrusion is arranged in the end areas at both ends of the side panel body, and the first support protrusion and the second support protrusion are respectively strip-shaped ribs extending along the length direction of the side panel body, and in the width direction of the side panel body, the width of the second support protrusion is greater than the width of the first support protrusion.

[0014] Beneficial effects: By setting a first supporting protrusion with a narrower width in the middle area of ​​the side panel body, the area occupied by the supporting protrusion in the middle area is smaller, which is convenient for subsequent hole opening. By setting a second supporting protrusion with a larger width in the end areas at both ends of the side panel body, the structural strength is greater, and it can play a guiding role when assembled with the battery shell, which facilitates the rapid assembly of the battery side panel and the battery shell and avoids the problem that the width is too narrow and easy to deform, and cannot play an effective guiding role. In addition, the second supporting protrusion can play a role in strengthening the structural strength of the two ends of the side panel body.

[0015] In an optional embodiment, a plurality of rows of ventilation holes are arranged at intervals along the width direction of the side panel body, and each row of ventilation holes includes a plurality of ventilation holes evenly spaced along the length direction of the side panel body.

[0016] Beneficial effect: By opening multiple rows of vents on the battery side panels as electrode group airways, it is more conducive to the rapid discharge of gas inside the electrode group, thereby avoiding the phenomenon of electrode group thermal runaway due to airway blockage.

[0017] In an optional embodiment, the opening area of ​​the vent hole is S1, and the area of ​​the side plate body is S, wherein S1 / S<50%.

[0018] Beneficial effect: The hole margin and hole spacing of the vent holes are designed with the above-mentioned dimensions, which can effectively ensure the structural strength of the battery side plate and avoid the problem that the battery side plate is too weak due to the openings being too dense, which cannot play an effective supporting role and is easy to be damaged.

[0019] In an optional embodiment, the thickness of the side plate body is set to D, the hole margin of the ventilation holes is set to W1, and the hole spacing is set to W2, wherein W1>5D, and W2>4D.

[0020] Beneficial effect: The hole margin and hole spacing of the vent holes are designed with the above-mentioned dimensions, which can effectively ensure the structural strength of the battery side plate and avoid the problem that the battery side plate is too weak due to the openings being too dense, which cannot play an effective supporting role and is easy to be damaged.

[0021] In an optional embodiment, recessed portions are respectively provided on both side edges of the side panel body along the width direction.

[0022] Beneficial Effects: The recessed portions can increase the area of ​​the exhaust passage while maintaining the normal support and protection functions of the battery side panels, providing more ample airway space for the batteries. Furthermore, in this embodiment, the recessed portions provided at both ends of the battery side panels can also reduce material costs.

[0023] In an optional embodiment, the top surface of the supporting protrusion is a curved surface or a special-shaped surface with a middle portion being more convex than the protrusions on both sides.

[0024] Beneficial effect: By setting the top surface of the supporting protrusion as an arc-shaped abutting surface in the middle compared to the arc surface or special-shaped surface of the protrusions on both sides, the gap space between two adjacent supporting protrusions is larger, which is more conducive to gas circulation.

[0025] In an optional embodiment, the length of the side panel body is set to L, the width is set to H, and the thickness is set to D, wherein 150mm <L<800mm,8mm<H<200mm,0.5mm<D<6mm。

[0026] In the second aspect, the present application also provides a battery, comprising a pole group, a battery shell, an explosion-proof valve, and a battery side plate as described in any of the above embodiments, wherein the battery shell has a accommodating cavity inside, and the pole group is arranged in the accommodating cavity; the explosion-proof valve is installed on one side wall of the battery shell, and the explosion-proof valve is suitable for opening at a preset pressure to allow the gas in the accommodating cavity to be discharged; the battery side plate is arranged in the battery shell and is located between the pole group and the explosion-proof valve; the support protrusion on the battery side plate is suitable for supporting and abutting against the side wall of the battery shell to form an exhaust channel between two adjacent support protrusions, and the exhaust channel can allow air flow to circulate in the space between the accommodating cavity and the side plate body and the explosion-proof valve.

[0027] Beneficial effect: The gap between two adjacent supporting protrusions on the battery side panel of the present application forms an exhaust channel for air flow to circulate in the accommodating cavity of the battery shell and the space between the side panel body and the explosion-proof valve, thereby being more conducive to the rapid discharge of gas inside the battery and avoiding the problem of the battery side panel being tightly attached to the inner wall of the shell and the air flow being poor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. 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 any creative work.

[0029] FIG1 is a schematic structural diagram of an explosion-proof valve, an electrode group, and a battery side plate in an embodiment of the present application;

[0030] FIG2 is a schematic structural diagram of a battery side plate according to an embodiment of the present application;

[0031] FIG3 is a partial enlarged view of FIG2;

[0032] FIG4 is a top view of the battery side plate of FIG2 ;

[0033] FIG5 is a bottom view of the battery side plate of FIG2 ;

[0034] FIG6 is a partial enlarged view of the battery side plate in FIG5;

[0035] FIG7 is a partial enlarged side view of the battery side plate in FIG2;

[0036] FIG8 is a top view of a battery in an embodiment of the present application;

[0037] FIG9 is a cross-sectional view taken along the AA direction in FIG8 ;

[0038] FIG10 is a schematic diagram of the assembly of the battery housing and the explosion-proof valve in an embodiment of the present application.

[0039] Explanation of the accompanying drawings: 100, battery; 10, electrode group; 20, explosion-proof valve; 30, battery side plate; 301, support protrusion; 3011, first support protrusion; 3012, second support protrusion; 302, vent; 303, inner recess; 304, balancing hole; 40, battery case; 50, first cover plate; 60, second cover plate. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "inner," "upper," "outer," "lower," and "under" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal connection between two components; wireless connection or wired connection. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0043] As lithium-ion battery technology matures, it is widely used as a power battery in electric vehicles and energy storage, leading to increasing demands for performance and safety. The side panels of lithium-ion batteries are core components for safety and thermal runaway prevention, and their structural design is crucial to electrode group safety. Existing battery side panels have a simple structure that only provides support and protection, but has little effect on improving thermal runaway within the electrode group. This hinders the discharge of internal gas from the electrode group, making it prone to thermal runaway problems caused by airway blockage.

[0044] In addition, the battery side panels in the related art are mostly made of PP material die-cut parts. However, since die-cut parts can only produce battery side panels with a uniform overall thickness, the use of 0.2-0.3mm die-cut parts can only produce battery side panels with low battery airway requirements. Therefore, for some batteries with high requirements for the thickness, shape, and structure of the battery side panels, die-cut parts are not suitable for processing and production. In addition, for battery side panels with a length L greater than 500mm, the related art generally uses two-section splicing (hot melt, friction vibration welding, etc.). This process is complex and costly, and is prone to defects during the production process.

[0045] The following describes an embodiment of the present application with reference to FIG. 1 to FIG. 10 .

[0046] According to an embodiment of the present application, on the one hand, the present application provides a battery side plate 30, which is arranged between the electrode group 10 and the battery shell 40, and the battery side plate 30 is integrally injection molded. The battery side plate 30 includes a side plate body and a support protrusion 301 protruding from a side of the side plate body away from the electrode group 10. The support protrusion 301 includes a plurality of support protrusions 301 arranged at intervals along the length direction of the side plate body; the support protrusion 301 is suitable for supporting and abutting against the inner wall of the battery shell 40 after the battery side plate 30, the electrode group 10 and the battery shell 40 are assembled, so as to form an exhaust channel for airflow between two adjacent support protrusions 301.

[0047] In the above embodiment, by providing a plurality of support protrusions 301 at intervals on the side plate body, after the electrode group 10, the battery side plate 30 and the battery housing 40 are assembled, the support protrusions 301 can be supported against the inner wall of the battery housing 40, thereby supporting and protecting the electrode group 10. In addition, the gap between two adjacent support protrusions 301 forms an exhaust channel for airflow, which is more conducive to the rapid discharge of gas inside the battery 100 and avoids the problem of the battery side plate 30 being tightly attached to the inner wall of the battery housing 40 and poor airflow.

[0048] In this embodiment, the battery side panel 30 is integrally formed using an injection molding process. The thickness and shape of the battery 100 side are not restricted and can be processed into any shape according to actual needs, reducing the manufacturing difficulty of the battery side panel 30. Because the support protrusion 301 and the side panel body in this embodiment are not coplanar, that is, the thickness of the entire battery side panel 30 is inconsistent, the battery side panel 30 manufactured using the injection molding process can be processed to produce battery side panels 30 of inconsistent thickness, effectively resolving the limitation that die-cut parts can only produce battery side panels 30 of uniform thickness.

[0049] In some embodiments, support protrusions 301 are respectively provided on both side edges of the side panel body along the length direction.

[0050] In the above embodiment, by respectively providing support protrusions 301 on both side edges of the side panel body, support can be provided from both sides, thereby improving the stability of the cooperation between the battery side panel 30 and the battery housing 40. At the same time, exhaust channels can be formed on both sides of the side panel body to improve the airflow distribution of the battery side panel 30, thereby effectively preventing thermal runaway of the electrode group 10 due to airway blockage.

[0051] In some embodiments, the side panel body includes end areas located at both ends and a middle area arranged between the two end areas, and the support protrusion 301 includes a first support protrusion 3011 and a second support protrusion 3012. There are multiple first support protrusions 3011, and the multiple first support protrusions 3011 are evenly spaced in the middle area of ​​the side panel body; the second support protrusion 3012 is arranged in the end areas at both ends of the side panel body, and the first support protrusion 3011 and the second support protrusion 3012 are respectively strip-shaped ribs extending along the length direction of the side panel body, and in the width direction of the side panel body, the width of the second support protrusion 3012 is greater than the width of the first support protrusion 3011.

[0052] In the above embodiment, by setting a first support protrusion 3011 with a narrower width in the middle area of ​​the side panel body, the area occupied by the support protrusion 301 in the middle area is smaller, which is convenient for subsequent hole opening. By setting a second support protrusion 3012 with a larger width in the end areas at both ends of the side panel body, the structural strength is greater, and it can play a guiding role when assembled with the battery shell 40, facilitating the rapid assembly of the battery side panel 30 and the battery shell 40, avoiding the problem that the width is too narrow and easy to deform, and cannot play an effective guiding role. In addition, the second support protrusion 3012 can play a role in strengthening the structural strength of the two ends of the side panel body.

[0053] Furthermore, in this embodiment, the protrusion heights of the first supporting protrusion 3011 and the second supporting protrusion 3012 are consistent.

[0054] Furthermore, a balancing hole 304 is formed in the second support protrusion 3012. Optionally, the balancing hole 304 can be a through hole extending through the thickness of the side panel body, or a countersunk hole. The balancing hole 304 not only serves as an airway for gas flow, but also helps to even out the wall thickness, preventing shrinkage and deformation at both ends of the side panel body.

[0055] Specifically, since the second support protrusion 3012 is wider, due to the uneven thickness and weight distribution, the surfaces at both ends of the side panel body will shrink, resulting in appearance defects. Therefore, this embodiment has a balancing hole 304 opened on the second support protrusion 3012 to reduce the wall thickness at both ends of the side panel body, thereby achieving uniform wall thickness and avoiding shrinkage and deformation at both ends of the side panel body.

[0056] In some embodiments, a plurality of rows of ventilation holes 302 are arranged at intervals along the width direction of the side panel body, and each row of ventilation holes 302 includes a plurality of ventilation holes 302 evenly spaced along the length direction of the side panel body.

[0057] In the above embodiment, the multiple rows of vent holes 302 provided on the battery side plate 30 serve as air passages for the electrode assembly 10 , which facilitates rapid discharge of gas inside the electrode assembly 10 , thereby avoiding thermal runaway of the electrode assembly 10 due to air passage blockage.

[0058] In some optional embodiments, three rows of ventilation holes 302 are arranged at intervals on the battery side plate 30 , and each row of ventilation holes 302 includes a plurality of ventilation holes 302 arranged at intervals along the length direction of the side plate body.

[0059] In some embodiments, the opening area of ​​the vent hole 302 is S1, and the area of ​​the side plate body is S, wherein S1 / S<50%.

[0060] In the above embodiment, the opening area of ​​the vent hole 302 is limited to the above size range, which can effectively avoid the problem of low structural strength and easy damage of the battery side plate 30 caused by the opening area of ​​the vent hole 302 being too large.

[0061] It should be noted that the opening area S1 of the vent hole 302 in this embodiment is not limited to the above range. In order to improve the exhaust speed and exhaust efficiency, the ratio of the opening area S1 of the vent hole 302 to the area S of the side panel body is set to be greater than or equal to 50%, which falls within the protection scope of this application and is not limited in this embodiment.

[0062] In some embodiments, 5% < S1 / S < 50%, and the opening area of ​​the vent hole 302 is limited to the above size range to avoid the opening area of ​​the vent hole 302 being too small, which has no substantial effect on improving thermal runaway inside the electrode group 10, resulting in insufficient exhaust channels inside the battery 100, making the electrode group 10 prone to thermal runaway problems.

[0063] It should be noted that the opening area S1 of the vent holes 302 is the total area of ​​all vent holes 302, and the area S of the side panel body is the total area contained within the outer contour line of the side panel body, that is, the area of ​​the vent holes 302 is part of the area of ​​the side panel body.

[0064] Alternatively, in this embodiment, 30% < S1 / S < 50%. The vent holes 302 are designed with the aforementioned dimensions to maximize their opening area while maintaining the structural strength of the battery side plate 30. The relatively large opening area of ​​the vent holes 302 helps reduce exhaust resistance and facilitates the discharge of gas from the electrode assembly 10, thereby effectively preventing thermal runaway of the electrode assembly 10 due to airway blockage.

[0065] In some embodiments, referring to FIG. 5 and FIG. 6 , the thickness of the side plate body is set to D, the hole margin of the vent hole 302 is set to W1, and the hole spacing is set to W2, wherein W1>5D, and W2>4D.

[0066] In this embodiment, the hole margins and hole spacing of the vent holes 302 are designed with the above-mentioned dimensions, which can effectively ensure the structural strength of the battery side plate 30 and avoid the problem that the openings are too dense, resulting in low strength of the battery side plate 30, inability to play an effective supporting role, and easy damage.

[0067] It should be noted that, in this embodiment, the hole margin distance W1 of the vent holes 302 is the distance between the vent holes 302 located near the two long edges of the side panel body and the two long edges of the side panel body. The hole spacing W2 refers to the distance between two adjacent vent holes 302 in two adjacent rows of vent holes 302.

[0068] Optionally, the distance between two adjacent ventilation holes 302 in the same row of ventilation holes 302 is also W2, which improves the aesthetics and facilitates processing and manufacturing.

[0069] In some embodiments, as shown in FIG. 2 to FIG. 6 , inner recesses 303 are respectively provided on both side edges of the side plate body along the width direction.

[0070] In the above embodiment, the recessed portions 303 are provided to increase the area of ​​the exhaust passage while maintaining the normal support and protection functions of the battery side plate 30, thereby providing more ample airway space for the battery 100. Furthermore, in this embodiment, the recessed portions 303 provided at both ends of the battery side plate 30 can also reduce material costs.

[0071] Furthermore, the inner concave portion 303 is a groove structure formed by inward depression of two short sides of the side plate body.

[0072] In some embodiments, the top surface of the supporting protrusion 301 is a curved surface or a special-shaped surface with a center that is more convex than the two sides.

[0073] In the above embodiment, by setting the top surface of the supporting protrusion 301 as an arc-shaped abutting surface in the middle compared to the arc surface or special-shaped surface of the protrusions on both sides, the gap space between two adjacent supporting protrusions 301 is larger, which is more conducive to gas circulation.

[0074] In one implementation of the above embodiment, the top surface of the support protrusion 301 is an arcuate surface that bulges away from the electrode assembly 10. The arcuate contact surface forms a convex point structure, which enables point contact between the battery side plate 30 and the battery housing 40, reducing the contact area and increasing the gap space between the two support protrusions 301, which is more conducive to gas circulation.

[0075] Specifically, the support protrusion 301 is a strip-shaped rib extending along the length direction of the battery side plate 30. The strip-shaped rib is a rib structure with a D-shaped cross-section. Its flat surface is fixed on the side plate body, and the curved surface is suitable for abutting against the inner wall of the battery shell 40.

[0076] In another embodiment of the above embodiment, the top surface of the support protrusion 301 includes a central abutment plane and inclined surfaces at either end of the abutment plane, with the inclined surfaces obliquely connected between the side plate body and the abutment plane. Both the abutment plane and the inclined surfaces are straight walls. This design improves the support stability of the battery side plate 30 and the battery housing 40 while increasing the gap between two adjacent support protrusions 301, thereby increasing the airway area.

[0077] In some embodiments, the length of the side panel body is set to L, the width is set to H, and the thickness is set to D, wherein 150mm <L<800mm,8mm<H<200mm,0.5mm<D<6mm。

[0078] In the above embodiment, the battery side plate 30 formed by injection molding cooperates with the electrode group 10. The battery side plate 30 is not limited by thickness and shape and can be processed into any length, width and thickness as needed.

[0079] Optionally, in this embodiment, the battery side plate 30 is heat-fused to the electrode assembly 10. Heat-fusion points are spaced along the length of the side plate body, and heat-fusion holes are reserved at these points. The heat-fusion holes are smaller than the vent holes 302, allowing for sufficient connection area and improving the stability of the heat-fusion connection.

[0080] In combination with Figures 1, 2 and 8 to 10, according to an embodiment of the present application, on the other hand, a battery 100 is provided, comprising a pole group 10, a battery shell 40, an explosion-proof valve 20, and a battery side plate 30 of any of the above embodiments, wherein the battery shell 40 has an accommodating cavity inside, and the pole group 10 is arranged in the accommodating cavity; the explosion-proof valve 20 is installed on one side wall of the battery shell 40, and the explosion-proof valve 20 is suitable for opening at a preset pressure to allow the gas in the accommodating cavity to be discharged; the battery side plate 30 is arranged in the battery shell 40 and is located between the pole group 10 and the explosion-proof valve 20; the support protrusion 301 on the battery side plate 30 is suitable for supporting and abutting against the side wall of the battery shell 40 to form an exhaust channel between two adjacent support protrusions 301, and the exhaust channel can allow air flow to circulate in the accommodating cavity and the space between the side plate body and the explosion-proof valve 20.

[0081] In the above embodiment, the gap between two adjacent support protrusions 301 on the battery side plate 30 forms an exhaust channel for air to circulate in the accommodating cavity of the battery shell 40 and the space between the side plate body and the explosion-proof valve 20, thereby being more conducive to the rapid discharge of gas inside the battery 100 and avoiding the problem of the battery side plate 30 being tightly attached to the inner wall of the battery shell 40 and the airflow being poor.

[0082] Furthermore, the battery side plate 30 includes a first side surface and a second side surface that are arranged opposite to each other, wherein: the first side surface is fixed to the side wall of the electrode group 10, and a plurality of support protrusions 301 are arranged at intervals on the two long edges of the second side surface; the support protrusions 301 are suitable for supporting and abutting against the inner wall of the battery shell 40 to form an exhaust channel for airflow between two adjacent support protrusions 301.

[0083] It should be noted that the electrode group 10 in this embodiment is a single bare cell with positive and negative electrode sheets, or it can also be a plurality of bare cells connected in series to form an electrode group 10. Optionally, the electrode group 10 and its external insulating film are connected by hot melt or tape.

[0084] Optionally, in this embodiment, the battery housing 40 is an aluminum housing.

[0085] In some embodiments, as shown in Figures 1 and 8 to 10, a first cover plate 50 and a second cover plate 60 are fixedly provided at both ends of the electrode group 10; the battery housing 40 is a hollow housing with openings at both ends, and the battery housing 40 is sleeved on the outer periphery of the electrode group 10; the first cover plate 50 is connected to one end of the battery housing 40, and a first electrode column is provided on the first cover plate 50; the second cover plate 60 is connected to the other end of the battery housing, and a second electrode column is provided on the second cover plate 60.

[0086] In some embodiments, a bottom plate is further provided on the bottom of the electrode group 10 , and the bottom plate and the battery side plate 30 are arranged on both sides of the electrode group 10 opposite to each other.

[0087] The battery 100 in this example may be a power battery such as a lithium-ion battery or a sodium-ion battery, and is used in mechanical equipment that requires electric power to start, such as electric vehicles.

[0088] This embodiment provides a battery that is highly safe, has good performance, and is easy to install.

[0089] This application has the following advantages:

[0090] 1. In this embodiment, the battery side plate 30 is made by injection molding, and a battery side plate 30 with a more complex shape and structure can be processed to match the electrode group 10 according to different requirements.

[0091] 2. In this embodiment, the gap between two adjacent support protrusions 301 on the battery side plate 30 forms an exhaust channel for air to circulate within the accommodating cavity of the battery shell 40 and the space between the side plate body and the explosion-proof valve 20, thereby being more conducive to the rapid discharge of gas inside the battery 100 and avoiding the problem of the battery side plate 30 being tightly attached to the inner wall of the battery shell 40 and the airflow being poor.

[0092] 3. This embodiment limits the distribution ratio and distribution pattern of the vent holes 302 on the battery side plate 30 , thereby improving the airway distribution inside the electrode group 10 and enhancing the safety of the electrode group 10 .

[0093] 4. In this embodiment, the battery side plate 30 is provided, and the specification parameters of the battery side plate 30 are more reasonably designed, providing sufficient airway space and structural safety protection for the battery 100 with the explosion-proof valve 20 provided on the side, and the assembly is simple and the production cost is low.

[0094] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery side plate, arranged between the electrode group and the battery housing, characterized in that: The battery side plate is integrally injection-molded, and the battery side plate comprises: Side panel body; A support protrusion, protrudingly disposed on a side surface of the side plate body away from the pole group, the support protrusion comprising a plurality of support protrusions spaced apart along a length direction of the side plate body; The support protrusion is suitable for supporting and abutting against the inner wall of the battery shell after the battery side plate, the electrode group and the battery shell are assembled, so as to form an exhaust channel for air flow between two adjacent support protrusions.

2. The battery side plate according to claim 1, characterized in that: The supporting protrusions are respectively arranged on the two side edges of the side plate body along the length direction.

3. The battery side plate according to claim 1, characterized in that: The side plate body includes end regions located at both ends and a middle region arranged between the two end regions, and the supporting protrusion includes: There are a plurality of first supporting protrusions, and the plurality of first supporting protrusions are evenly spaced and arranged in the middle area of ​​the side plate body; The second supporting protrusion is arranged in the end area at both ends of the side panel body, the first supporting protrusion and the second supporting protrusion are respectively strip-shaped ribs extending along the length direction of the side panel body, and in the width direction of the side panel body, the width of the second supporting protrusion is greater than the width of the first supporting protrusion.

4. The battery side plate according to any one of claims 1 to 3, characterized in that: A plurality of rows of ventilation holes are arranged at intervals along the width direction on the side plate body, and each row of ventilation holes includes a plurality of ventilation holes arranged at even intervals along the length direction of the side plate body.

5. The battery side plate according to claim 4, characterized in that: The opening area of ​​the vent hole is S1, and the area of ​​the side plate body is S, wherein S1 / S<50%.

6. The battery side plate according to claim 4, characterized in that: The thickness of the side plate body is set to D, the hole margin of the ventilation hole is set to W1, and the hole spacing is set to W2, wherein W1>5D, and W2>4D.

7. The battery side plate according to any one of claims 1 to 3, characterized in that: The side plate body is provided with inner recesses on both side edges along the width direction.

8. The battery side plate according to any one of claims 1 to 3, characterized in that: The top surface of the supporting protrusion is a curved surface or a special-shaped surface with a middle portion being more protruding than the protrusions on both sides.

9. The battery side plate according to any one of claims 1 to 3, characterized in that: The length of the side panel body is set to L, the width is set to H, and the thickness is set to D, wherein 150 mm <L<800mm,8mm<H<200mm,0.5mm<D<6mm。 10. A battery, characterized in that: include: Pole group; A battery housing having a receiving cavity therein, wherein the electrode group is arranged in the receiving cavity; An explosion-proof valve, mounted on a side wall of the battery housing, the explosion-proof valve being adapted to open under a preset pressure to allow the gas in the accommodating cavity to be discharged; The battery side plate according to any one of claims 1 to 9, arranged in the battery housing and located between the electrode group and the explosion-proof valve; The supporting protrusions on the battery side plate are suitable for supporting and abutting against the side wall of the battery housing to form an exhaust channel between two adjacent supporting protrusions, and the exhaust channel allows air flow to flow in the space between the accommodating cavity and the side plate body and the explosion-proof valve.

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