Side panels and batteries

Abstract

The utility model relates to battery technical field provides a kind of side plate and battery, above-mentioned side plate includes: including side plate body.The side plate body has the first exhaust hole and the second exhaust hole through side plate body, the first exhaust hole is oppositely arranged with explosion-proof valve, the second exhaust hole is located in the side of first exhaust hole, and it is communicated with the first exhaust hole and is arranged, to form exhaust passage.The side plate provided by the utility model, the exhaust passage formed by the communication of the first exhaust hole and the second exhaust hole can provide better pressure relief capacity, more conducive to the pressure relief of battery, improve the safety performance of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a side plate and a battery. Background Technology

[0002] Current power battery structures typically place the electrode assembly within the housing cavity. The electrode assembly is formed by stacking positive and negative electrode plates and a separator. After the electrode assembly is stacked, it is installed and sealed inside the housing. To achieve thermoelectric separation of the battery, an explosion-proof valve is installed on the side of the housing.

[0003] In existing technologies, a side plate is typically installed between the bottom of the electrode assembly and the casing, and a pressure relief hole is provided on the side plate corresponding to the explosion-proof valve on the cell casing. However, when the cell experiences thermal runaway, the pressure relief capacity of the pressure relief hole is limited, which is detrimental to the cell's pressure relief and thus compromises the cell's safety. Utility Model Content

[0004] This invention provides a side plate and a battery to solve the problem that the pressure relief holes of the side plates in the prior art have limited pressure relief capacity, making it difficult to ensure the safety of the battery cells.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, this utility model provides a side plate for use in a battery, comprising: a side plate body; The side plate body has a first vent hole and a second vent hole that penetrate the side plate body. The first vent hole is disposed opposite to the explosion-proof valve. Along the length direction of the side plate body, the second vent hole is disposed beside the first vent hole and is connected to the first vent hole to form an exhaust channel.

[0006] According to the present invention, a side plate is provided in which the first exhaust hole and the second exhaust hole are both extended along the length direction of the side plate body; The side plate body also has a connecting hole, which extends along the length of the side plate body, and the two ends of the connecting hole are respectively connected to the first exhaust hole and the second exhaust hole.

[0007] According to a side plate provided by this utility model, the second exhaust hole is provided in multiple ways, and the connecting hole is provided in multiple ways; Along the length of the side plate body, a portion of the second exhaust holes are located on the first side of the first exhaust hole, and the remaining second exhaust holes are located on the second side of the first exhaust hole, with the first side and the second side of the first exhaust hole being opposite to each other; The connecting hole connects the first exhaust hole and the second exhaust hole, and the connecting hole connects two adjacent second exhaust holes.

[0008] According to the present invention, a side plate body further comprises: a third vent hole; The third exhaust port is provided in multiple parts, and the area of ​​the third exhaust port is smaller than the area of ​​the second exhaust port; Along the length of the side plate body, the third vent is located at the end of the side plate body; And / or, along the width direction of the side plate body, the third vent is located on both sides of the connecting hole.

[0009] According to the present invention, a side plate is provided, wherein the third exhaust hole is a circular hole, and a plurality of the third exhaust holes are evenly spaced on the side plate body.

[0010] According to the side plate provided by this utility model, the area of ​​the first exhaust hole is larger than the exhaust area of ​​the explosion-proof valve.

[0011] According to the side plate provided by this utility model, along the width direction of the side plate body, the width of the first exhaust hole is w1, the width of the connecting hole is w2, and w1 and w2 satisfy: 0.5≤w2 / w1≤1; And / or, along the width direction of the side plate body, the distance between the hole wall of the first exhaust hole and the side wall of the side plate body is k, where k satisfies: k≥1.5mm.

[0012] According to the present invention, the thickness of the side plate body along the height direction of the battery is a, where a satisfies: 0.3mm≤a≤1.5mm.

[0013] According to the present invention, a side plate is provided on the side plate body, wherein a plurality of hot-melt zones are provided, the hot-melt zones are arranged at intervals with the first vent hole, the second vent hole and the connecting hole, and the hot-melt zones are used for hot-melt fixing of the side plate body and the insulating film.

[0014] Secondly, this utility model provides a battery, comprising: The shell has a receiving cavity; The pole group is located in the receiving cavity; An explosion-proof valve is located on one side of the housing in the width direction; An insulating film is used to cover the electrode assembly; The side plate, as described above, is disposed between the electrode group and the insulating film, and is located on one side of the housing in the width direction, corresponding to the explosion-proof valve.

[0015] The side plate and battery provided by this utility model have a through-hole and a second vent hole on the side plate body, with the first vent hole facing the explosion-proof valve and the second vent hole located beside and connected to the first vent hole, forming an exhaust channel. When the battery experiences thermal runaway, a large amount of high-temperature gas generated by the electrode assembly is promptly collected from the second vent hole toward the first vent hole and discharged into the explosion-proof valve from the first vent hole. Since the gas generated on the entire side of the electrode assembly can be discharged into the explosion-proof valve in a timely manner, the exhaust channel formed by the connection of the first and second vent holes can provide better pressure relief capacity, which is more conducive to the pressure relief of the battery and improves the safety performance of the battery. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the side plate provided by this utility model.

[0018] Figure 2 This is a front view of the side panel provided by this utility model.

[0019] Figure 3 This is a three-dimensional structural diagram of the battery provided by this utility model.

[0020] Figure 4 This is a top view of the battery provided by this utility model.

[0021] Figure 5 This utility model provides Figure 4 AA sectional view.

[0022] Figure 6 This utility model provides Figure 5 Enlarged view of the R part.

[0023] Figure label: 1. Side panels; 11. Side panel body; 12. First vent; 13. Second vent; 14. Connecting hole; 15. Third vent; 16. Hot melt zone; 2. Housing; 3. Electrode assembly; 4. Explosion-proof valve; 5. Insulating membrane. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0027] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] The following is combined Figures 1 to 6 The side plate and battery provided in this utility model embodiment will be described in detail through specific embodiments and application scenarios.

[0030] Firstly, such as Figure 1 and Figure 2 As shown, this embodiment provides a side plate 1, which is applied to a battery and includes: a side plate body 11.

[0031] The side plate body 11 has a first exhaust hole 12 and a second exhaust hole 13 that pass through the side plate body 11. The first exhaust hole 12 is arranged opposite to the explosion-proof valve 4. Along the length direction of the side plate body 11, the second exhaust hole 13 is located next to the first exhaust hole 12 and is connected to the first exhaust hole 12 to form an exhaust channel.

[0032] Understandably, in order to achieve thermoelectric separation of the battery cell, the explosion-proof valve 4 in this embodiment is not located on the cover plate, but on one side of the housing 2 in the width direction. That is, when the high-temperature gas of the electrode group 3 is discharged through the explosion-proof valve 4, the path is different from the path through which the electrode tabs transmit current through the electrode posts on the cover plate.

[0033] To ensure timely discharge of gases generated when the electrode assembly 3 overheats, this embodiment includes a first vent 12 on the side plate 1. The first vent 12 is positioned opposite the area containing the explosion-proof valve 4, allowing the high-temperature gases from the electrode assembly 3 to directly enter the explosion-proof valve 4. To ensure that all exhaust gases from the electrode assembly 3 along the length of the housing 2 can enter the explosion-proof valve 4, this embodiment includes a second vent 13 beside the first vent 12, connecting the first and second vents. High-temperature gases generated in areas of the electrode assembly 3 not facing the explosion-proof valve 4 can enter the second vent 13 in a straight line, then pass through the connecting passage between the second and first vents to enter the first vent 12, and finally exit into the explosion-proof valve 4. Thus, along the length of the housing 2, all high-temperature gases generated along the entire side of the electrode assembly 3 can converge at the first vent 12 via the first and second vents, and then exit through the explosion-proof valve 4, achieving unobstructed battery exhaust channels.

[0034] Specifically, the shape of the first exhaust port 12 can be strip-shaped, circular, or elliptical. The shape of the second exhaust port 13 can be strip-shaped, circular, or elliptical.

[0035] Optionally, the first exhaust port 12 and the second exhaust port 13 can be connected by a straight channel, a broken line channel, or an arc channel.

[0036] Alternatively, the side panel body 11 may use an insulating plastic component.

[0037] The side plate 1 provided by this utility model has a through first vent hole 12 and a second vent hole 13 on the side plate body 11, with the first vent hole 12 facing the explosion-proof valve 4 and the second vent hole 13 located beside the first vent hole 12 and connected to it, forming an exhaust channel. When the battery experiences thermal runaway, a large amount of high-temperature gas generated by the electrode group 3 is promptly collected from the second vent hole 13 toward the first vent hole 12 and discharged into the explosion-proof valve 4 from the first vent hole 12. Since the gas generated on the entire side of the electrode group 3 can be discharged into the explosion-proof valve 4 in a timely manner, the exhaust channel formed by the connection of the first vent hole 12 and the second vent hole 13 can provide better pressure relief capability, which is more conducive to the pressure relief of the battery and improves the safety performance of the battery.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, the first exhaust hole 12 and the second exhaust hole 13 both extend along the length direction of the side plate body 11.

[0039] The side plate body 11 also has a connecting hole 14, which extends along the length of the side plate body 11, and the two ends of the connecting hole 14 are respectively connected to the first exhaust hole 12 and the second exhaust hole 13.

[0040] Understandably, to ensure the exhaust area of ​​the first exhaust port 12 and the second exhaust port 13 is as large as possible, in this embodiment, both the first exhaust port 12 and the second exhaust port 13 extend along the length direction of the side plate body 11. Since the side plate 1 abuts against the electrode assembly 3, the strip-shaped arrangement of the first exhaust port 12 and the second exhaust port 13 can increase the exhaust area of ​​the first exhaust port 12 and the second exhaust port 13, making the exhaust channel between the electrode assembly 3 and the housing 2 larger. Furthermore, since the connecting hole 14 also extends along the length direction of the side plate body 11, the strip-shaped connecting hole 14 can connect the first exhaust port 12 and the second exhaust port 13 without occupying a large area of ​​the side plate body 11, thus ensuring the structural strength of the side plate body 11.

[0041] like Figure 1 and Figure 2 As shown, in this embodiment, the second exhaust port 13 is provided with multiple holes, and the connecting hole 14 is provided with multiple holes.

[0042] Along the length of the side plate body 11, some of the second exhaust holes 13 are located on the first side of the first exhaust hole 12, and the remaining second exhaust holes 13 are located on the second side of the first exhaust hole 12. The first side and the second side of the first exhaust hole 12 are arranged opposite to each other.

[0043] The connecting hole 14 connects the first exhaust hole 12 and the second exhaust hole 13, and the connecting hole 14 connects two adjacent second exhaust holes 13.

[0044] Understandably, since batteries come in various lengths, the number of second vent holes 13 is adapted to the length of the battery. This ensures that the first vent hole 12 and multiple second vent holes 13 can be arranged along the length of the side plate body 11 to cover the high-temperature exhaust of the entire side of the electrode group 3 along its length.

[0045] Since the first vent hole 12 is correspondingly located in the area where the explosion-proof valve 4 is installed, and the second vent hole 13 is located on both sides of the first vent hole 12, the connecting hole 14 can connect the first vent hole 12 and the second vent hole 13, as well as connect adjacent second vent holes 13, so as to form a connected exhaust channel in the length direction of the side plate body 11, ensuring that the exhaust from the second vent hole 13 located at the end of the side plate body 11 can also be collected into the first vent hole 12 through multiple second vent holes 13 and multiple connecting holes 14.

[0046] In one example, the side plate body 11 of this embodiment has one first exhaust hole 12 and two second exhaust holes 13. The two second exhaust holes 13 are respectively disposed on both sides of the first exhaust hole 12, and each second exhaust hole 13 is connected to the first exhaust hole 12 through a connecting hole 14, that is, there are a total of two connecting holes 14. Specifically, the first exhaust hole 12 and the second exhaust hole 13 are both strip-shaped holes, and the included corners of the strip-shaped holes are rounded to avoid the formation of turbulence when high-temperature gas flows over the sharp ends, which is not conducive to the stable flow of high-temperature exhaust.

[0047] like Figure 1 and Figure 2 As shown, the side plate body 11 of this embodiment also has a third exhaust hole 15.

[0048] The third exhaust port 15 has multiple holes, and the area of ​​the third exhaust port 15 is smaller than the area of ​​the second exhaust port 13.

[0049] Along the length of the side plate body 11, the third vent 15 is provided at the end of the side plate body 11.

[0050] Understandably, since the diameter of the second vent 13 is comparable to that of the first vent 12, the second vent 13 does not extend to both ends of the side plate 1 to ensure the supporting strength of the side plate 1. In this embodiment, multiple third vents 15 are provided at both ends of the side plate 1. The area of ​​the third vent 15 is smaller than that of the second vent 13. The provision of the third vents 15 ensures the strength of the end of the side plate body 11, and high-temperature exhaust can also enter the exhaust channel through the third vents 15, thus achieving compatibility between the strength and exhaust performance of the side plate 1.

[0051] Specifically, the third exhaust hole 15 can be provided at the end of the side plate body 11 as a supplement to the exhaust area of ​​the second exhaust hole 13. The third exhaust hole 15 at the end can be used for high-temperature exhaust at the end of the side plate body 11.

[0052] like Figure 1 and Figure 2 As shown, along the width direction of the side plate body 11, the third exhaust hole 15 of this embodiment is provided on both sides of the connecting hole 14.

[0053] The third exhaust port 15 can also be set on both sides of the connecting hole 14 to facilitate the timely discharge of high-temperature gas from the electrode group 3 on both sides of the connecting hole 14.

[0054] like Figure 1 and Figure 2 As shown, the third exhaust hole 15 in this embodiment is a round hole, and multiple third exhaust holes 15 are evenly spaced on the side plate body 11.

[0055] Understandably, when multiple third vent holes 15 are evenly spaced on the side plate body 11, since the radius of curvature of the circular holes is the same and there are no sharp corners, the stress concentration coefficient of the circular holes is low, the stress distribution around the circular holes is more uniform, and the processing of the circular holes is simpler, and they can be directly drilled with a drill bit.

[0056] Furthermore, since the diameters of the multiple circular holes are the same, the cross-sectional area distribution of the remaining part on the side plate body 11 is more uniform. The same hole diameter ensures the consistency of local stress, reduces the possibility of local deformation incoordination caused by differences in hole diameter, and the third vent hole 15 with the same hole diameter is easier to process, thus improving the processing efficiency of the side plate body 11.

[0057] like Figure 1 As shown, the area of ​​the first vent 12 in this embodiment is larger than the vent area of ​​the explosion-proof valve 4.

[0058] Understandably, to ensure the smooth exhaust of high-temperature gas through the first exhaust port 12, the area of ​​the first exhaust port 12 in this embodiment is larger than the exhaust area of ​​the explosion-proof valve 4. This ensures that the high-temperature gas passing through the first exhaust port 12 is not blocked by the side plate body 11 and can smoothly enter the explosion-proof valve 4 and exit the housing 2. Furthermore, even after the side plate body 11 is deformed by heat, the first exhaust port 12 can still serve as part of the exhaust channel, preventing the deformation of the side plate body 11 from obstructing the high-temperature exhaust.

[0059] like Figure 1 and Figure 2 As shown, along the width direction of the side plate body 11, the width of the first exhaust hole 12 in this embodiment is w1, and the width of the connecting hole 14 is w2. w1 and w2 satisfy: 0.5≤w2 / w1≤1.

[0060] Understandably, the connecting hole 14 is mainly used to transport the gas into the second exhaust hole 13, while the first exhaust hole 12 is mainly used to directly discharge high-temperature gas into the explosion-proof valve 4. Therefore, the ratio of the width of the connecting hole 14 to the width of the first exhaust hole 12 needs to meet a certain range to ensure the strength of the side plate body 11, the smoothness of gas transport from the second exhaust hole 13 to the first exhaust hole 12, and the smoothness of gas discharge from the first exhaust hole 12 to the explosion-proof valve 4.

[0061] Specifically, w2 / w1 can be 0.5, 0.75, or 1.5.

[0062] like Figure 1 and Figure 2 As shown, along the width direction of the side plate body 11, the distance between the hole wall of the first exhaust hole 12 and the side wall of the side plate body 11 in this embodiment is k, and k satisfies: k≥1.5mm.

[0063] Understandably, in order to ensure the strength and flatness of the side plate body 11, the distance between the hole wall of the first exhaust hole 12 and the side wall of the side plate body 11 needs to meet a certain range.

[0064] Specifically, the k value can be 1.5mm, 1.75mm, or 2mm.

[0065] Along the height direction of the battery, the thickness of the side plate body 11 in this embodiment is a, where a satisfies: 0.3mm≤a≤1.5mm.

[0066] Understandably, since the side plate body 11 needs to support the pole group 3 and the housing 2, and also needs to have through holes in the side plate body 11 for venting, the thickness of the side plate body 11 needs to meet a certain range.

[0067] Specifically, the thickness of side panel 1 can be 0.15mm, 0.825mm, or 1.5mm.

[0068] like Figure 1 and Figure 2 As shown, the side plate body 11 of this embodiment is provided with a plurality of hot melt zones 16. The hot melt zones 16 are arranged at intervals with the first vent 12, the second vent 13 and the connecting hole 14. The hot melt zones 16 are used for hot melt fixation of the side plate body 11 and the insulating film 5.

[0069] Understandably, since the side plate 1 is sandwiched between the electrode group 3 and the insulating film 5, after the side plate 1 and the electrode group 3 are assembled, the side plate 1 and the insulating film 5 need to be heat-fused to fix them. In order to avoid the first vent hole 12, the second vent hole 13 and the connecting hole 14 opened on the side plate body 11, so as to prevent the heat fusion point from blocking the smooth exhaust of the venting channel, the heat fusion zone 16 in this embodiment is located on the side of the first vent hole 12, the second vent hole 13 and the connecting hole 14.

[0070] Specifically, in this embodiment, the hot-melt zone 16 is a square area, and its area is comparable to that of the third vent 15. Multiple square areas are provided, and these square areas are located between the first vent 12, the second vent 13, and the connecting hole 14.

[0071] Secondly, such as Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, this embodiment provides a battery, including: a casing 2, an electrode group 3, an explosion-proof valve 4, an insulating film 5, and a side plate 1.

[0072] The housing 2 has a receiving cavity; the electrode group 3 is disposed in the receiving cavity; the explosion-proof valve 4 is disposed on one side of the housing 2 in the width direction; the insulating film 5 covers the electrode group 3; the side plate 1, as described above, is disposed between the electrode group 3 and the insulating film 5, and is located on one side of the housing 2 in the width direction, corresponding to the explosion-proof valve 4.

[0073] Specifically, since the battery includes a side plate 1, and the specific structure of the side plate 1 is as described in the above embodiments, the battery shown in this embodiment includes all the technical solutions of the above embodiments. Therefore, it has at least all the beneficial effects achieved by all the technical solutions of the above embodiments, which will not be described in detail here.

[0074] Understandably, the battery cell housing 2 has a receiving cavity, the electrode group 3 is located in the receiving cavity, and the insulating film 5 covers the side plate 1 and the electrode group 3.

[0075] Since the explosion-proof valve 4 is located on the side of the housing 2 in the width direction, in order to ensure the support strength of the explosion-proof valve 4, in this embodiment, a side plate 1 is provided between the insulating film 5 and the electrode group 3 in the area corresponding to the explosion-proof valve 4. The side plate 1 can maintain the overall square structure of the battery cell and can also transmit the pressure generated by the expansion of the electrode group 3 to the housing 2 relatively evenly.

[0076] Because this embodiment has a first vent hole 12 and a second vent hole 13 connected on the side plate body 11, and the first vent hole 12 is oriented toward the explosion-proof valve 4, the high-temperature gas generated by the electrode group 3 can be timely gathered to the first vent hole 12 through the second vent hole 13 when the battery thermally runs away, and then discharged to the explosion-proof valve 4 through the first vent hole 12, thus achieving unobstructed exhaust channels for the battery and improving battery safety.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A side plate, used in a battery, characterized in that, include: Side panel body; The side plate body has a first vent hole and a second vent hole that penetrate the side plate body. The first vent hole is disposed opposite to the explosion-proof valve. Along the length direction of the side plate body, the second vent hole is disposed beside the first vent hole and is connected to the first vent hole to form an exhaust channel.

2. The side plate according to claim 1, characterized in that, Both the first exhaust port and the second exhaust port extend along the length direction of the side plate body; The side plate body also has a connecting hole, which extends along the length of the side plate body, and the two ends of the connecting hole are respectively connected to the first exhaust hole and the second exhaust hole.

3. The side plate according to claim 2, characterized in that, The second exhaust port is provided in multiple locations, and the connecting port is provided in multiple locations; Along the length of the side plate body, a portion of the second exhaust holes are located on the first side of the first exhaust hole, and the remaining second exhaust holes are located on the second side of the first exhaust hole, with the first side and the second side of the first exhaust hole being opposite to each other; The connecting hole connects the first exhaust hole and the second exhaust hole, and the connecting hole connects two adjacent second exhaust holes.

4. The side plate according to claim 3, characterized in that, The side plate body also has: a third vent; The third exhaust port is provided in multiple parts, and the area of ​​the third exhaust port is smaller than the area of ​​the second exhaust port; Along the length of the side plate body, the third vent is located at the end of the side plate body; And / or, along the width direction of the side plate body, the third vent is located on both sides of the connecting hole.

5. The side plate according to claim 4, characterized in that, The third exhaust hole is a round hole, and multiple third exhaust holes are evenly spaced on the side plate body.

6. The side plate according to claim 1, characterized in that, The area of ​​the first vent hole is larger than the vent area of ​​the explosion-proof valve.

7. The side plate according to claim 2, characterized in that, Along the width direction of the side plate body, the width of the first exhaust hole is w1, and the width of the connecting hole is w2. w1 and w2 satisfy: 0.5≤w2 / w1≤1; And / or, along the width direction of the side plate body, the distance between the hole wall of the first exhaust hole and the side wall of the side plate body is k, where k satisfies: k≥1.5mm.

8. The side plate according to claim 1, characterized in that, Along the height direction of the battery, the thickness of the side plate body is a, where a satisfies: 0.3mm≤a≤1.5mm.

9. The side plate according to claim 2, characterized in that, The side plate body is provided with multiple hot-melt zones, which are arranged at intervals with the first vent hole, the second vent hole and the connecting hole. The hot-melt zones are used for hot-melt fixing of the side plate body and the insulating film.

10. A battery, characterized in that, include: The shell has a receiving cavity; The pole group is located in the receiving cavity; An explosion-proof valve is located on one side of the housing in the width direction; An insulating film is used to cover the electrode assembly; The side plate, as described in any one of claims 1 to 9, is disposed between the electrode group and the insulating film, and is located on one side of the housing in the width direction, corresponding to the explosion-proof valve.

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