Housing and battery

Abstract

The utility model relates to battery technical field provides a kind of shell and battery, above-mentioned shell is applied to battery, shell has accommodating cavity, the height direction of shell has mounting hole in one side, mounting hole is used to install explosion-proof valve;The side of mounting hole includes first plate body and second plate body, first plate body and second plate body are spaced apart to form interlayer space, first plate body has mounting hole, second plate body is located in the side of first plate body towards accommodating cavity, second plate body is equipped with through communication hole, explosion-proof valve, interlayer space and communication hole form exhaust passage.The shell provided by the utility model promptly discharges the high-temperature gas of pole group to explosion-proof valve gathering through exhaust passage, and discharges shell through explosion-proof valve, improves the stability of internal exhaust of battery cell, enhances the safety performance of battery cell, and without setting up side plate support pole group, simplifies manufacturing and assembly process.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a casing 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. The electrode assembly abuts against the inner wall of the housing, which restricts the exhaust passage in the area where the explosion-proof valve is located, affecting the exhaust speed of the explosion-proof valve. Utility Model Content

[0003] This utility model provides a housing and a battery to solve the problem in the prior art where the exhaust channel is restricted and the exhaust speed is affected when the explosion-proof valve is installed on the side of the housing.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, this utility model provides a housing for use in a battery. The housing has a receiving cavity, and one side of the housing in the height direction has a mounting hole for mounting an explosion-proof valve. The side where the mounting hole is located includes a first plate and a second plate, which are spaced apart to form a sandwich space. The first plate has the mounting hole, and the second plate is located on the side of the first plate facing the receiving cavity. The second plate has a through-hole, and the explosion-proof valve, the sandwich space, and the through-hole form an exhaust channel.

[0005] According to the present invention, the area of ​​the connecting hole is larger than the exhaust area of ​​the explosion-proof valve.

[0006] According to the present invention, a housing is provided with a plurality of connecting holes, which are evenly spaced on the second plate.

[0007] According to the present invention, the connecting hole is a circular hole, and the diameter of the plurality of circular holes is the same.

[0008] According to the present invention, the wall thickness of the side of the housing having the mounting hole along the height direction of the housing is H, and the wall thickness of the other side of the housing is h, satisfying: H>h, and 0.8mm≤H≤3mm, 0.3mm≤h≤1.5mm.

[0009] According to the present invention, the thickness of the first plate is H2, the thickness of the second plate is H1, and the height of the interlayer space is H3, satisfying: H1≥h, H2≥h, 40%≤H3 / H≤75%.

[0010] According to the present invention, the width of the outer wall of the side where the mounting hole is located along the width direction of the housing is w, and the width of the interlayer space is w1, where w and w1 satisfy: 30%≤w1 / w≤80%.

[0011] According to the present invention, a housing is provided between the first plate and the second plate, and the reinforcing rib is arranged on the side of the connecting hole.

[0012] According to the present invention, the first plate and the second plate are provided with chamfers at the intersection lines with the adjacent side of the shell.

[0013] Secondly, this utility model provides a battery, comprising: The housing, as described above; The electrode assembly is disposed within the receiving cavity and abuts against the inner wall of the side of the housing with the mounting hole; An explosion-proof valve, wherein the explosion-proof valve is embedded in the mounting hole; A top cover is provided at the opening end of the receiving cavity.

[0014] The housing and battery provided by this utility model form a sandwich space between a first plate and a second plate spaced apart on the side where the mounting holes of the housing are located. The first plate has mounting holes for installing an explosion-proof valve, and the second plate has a through hole. The through hole, the sandwich space, and the explosion-proof valve form an exhaust channel, which is used to timely exhaust the high-temperature gas of the electrode group to the explosion-proof valve and then exhaust it out of the housing. This improves the stability of the exhaust inside the battery cell and enhances the safety performance of the battery cell. Furthermore, since the side of the electrode group facing the housing is structurally reinforced by the second plate, there is no need to set a side plate to support the electrode group, which simplifies the manufacturing and assembly process. Attached Figure Description

[0015] 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.

[0016] Figure 1This is a three-dimensional structural diagram of the shell provided by this utility model.

[0017] Figure 2 This is a schematic diagram of the left side of the shell provided by this utility model.

[0018] Figure 3 This utility model provides Figure 2 Enlarged view of the R part.

[0019] Figure 4 This is a top view of the shell structure provided by this utility model.

[0020] Figure 5 This utility model provides Figure 4 AA sectional view.

[0021] Figure 6 This utility model provides Figure 5 Enlarged view of part K.

[0022] Figure 7 This is an exploded view of the battery provided by this utility model.

[0023] Figure 8 This is a three-dimensional structural diagram of the battery provided by this utility model.

[0024] Figure label: 1. Shell; 11. First plate; 12. Second plate; 13. Interlayer space; 14. Reinforcing rib; 111. Mounting hole; 121. Connecting hole; 2. Pole assembly; 3. Explosion-proof valve; 4. Top cover. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The following is combined Figures 1 to 8The casing and battery provided in this utility model will be described in detail through specific embodiments and application scenarios.

[0031] Firstly, such as Figure 1 and Figure 2 As shown, this embodiment provides a housing 1 for use in a battery. The housing 1 has a receiving cavity, and a mounting hole 111 is provided on one side of the housing 1 in the height direction. The mounting hole 111 is used to install an explosion-proof valve 3. The side where the mounting hole 111 is located includes a first plate 11 and a second plate 12. The first plate 11 and the second plate 12 are spaced apart to form a sandwich space 13. The first plate 11 has the mounting hole 111, and the second plate 12 is located on the side of the first plate 11 facing the receiving cavity. The second plate 12 has a through-hole 121. The explosion-proof valve 3, the sandwich space 13, and the through-hole 121 form an exhaust channel.

[0032] Understandably, the housing 1 in this embodiment includes four sequentially connected sides, which are connected end-to-end to form a receiving cavity for accommodating the battery electrode assembly 2. To achieve thermoelectric separation of the battery, the explosion-proof valve 3 in this embodiment is located on the side of the housing 1 in the width direction, and is not located on the top cover 4. In the event of thermal runaway, the high-temperature gas inside the electrode assembly 2 is discharged from the housing 1 through the explosion-proof valve 3, which is different from the path by which the current is transferred from the tabs through the terminals on the top cover 4.

[0033] A mounting hole 111 is provided on the side of the housing 1 in the width direction. The explosion-proof valve 3 is embedded in the mounting hole 111 and is integrally formed with the side of the housing 1 by laser welding. Typically, the mounting hole 111 is located in the middle of the side of the housing 1, meaning the explosion-proof valve 3 is installed in the middle of the side of the housing 1. When the battery is in use, the side of the housing 1 where the explosion-proof valve 3 is located is placed at the bottom of the battery, and the electrode assembly 2 is pressed against the inner wall of the side of the housing 1 containing the explosion-proof valve 3. Since the lower side of the electrode assembly 2 abuts against the inner wall of the housing 1 along the length direction of the housing 1, only the lower side of the electrode assembly 2 in the area where the explosion-proof valve 3 is located can vent to the explosion-proof valve 3. To ensure that the entire electrode assembly 2 along the length of the casing 1 can vent to the explosion-proof valve 3, this embodiment provides a first plate 11 and a second plate 12 on the side where the mounting hole 111 is located. The gap between the first plate 11 and the second plate 12 forms an interlayer space 13, which can be used for the flow of high-temperature gas. The connecting hole 121 of the second plate 12 is used for high-temperature gas to enter the interlayer space 13 from the electrode assembly 2 side, so that the interlayer space 13 can communicate with the electrode assembly 2 side. In this way, the connecting hole 121, the interlayer space 13 and the explosion-proof valve 3 form an exhaust channel for venting the high-temperature gas generated by the electrode assembly 2 when the battery is in thermal runaway, which improves the stability of the internal exhaust of the cell and enhances the safety performance of the cell.

[0034] Furthermore, since the second plate 12 is spaced apart from the first plate 11, the second plate 12 can also provide support for the first plate 11. In this embodiment, the side plate that is additionally provided between the housing 1 and the pole group 2 can be omitted, simplifying the assembly process.

[0035] Optionally, there may be multiple first connecting holes 121 distributed on the second plate 12, or there may be only one first connecting hole 121, which extends along the length of the shell 1.

[0036] Specifically, the shape of the first connecting hole 121 can be strip-shaped, circular, or elliptical.

[0037] The housing 1 provided by this utility model has a first plate 11 and a second plate 12 spaced apart on the side where the mounting hole 111 is located, forming a sandwich space 13 between the first plate 11 and the second plate 12. The mounting hole 111 is provided on the first plate 11 for mounting the explosion-proof valve 3, and the through hole 121 is provided on the second plate 12, so that the through hole 121, the sandwich space 13 and the explosion-proof valve 3 form an exhaust channel, which is used to timely exhaust the high-temperature gas of the electrode group 2 to the explosion-proof valve 3 and then discharge it out of the housing 1 through the explosion-proof valve 3. This improves the stability of the exhaust inside the cell and enhances the safety performance of the cell. Furthermore, since the side of the electrode group 2 facing the housing 1 is structurally reinforced by the second plate 12, there is no need to set a side plate to support the electrode group 2, which simplifies the manufacturing and assembly process.

[0038] like Figure 1 As shown, the area of ​​the connecting hole 121 in this embodiment is larger than the exhaust area of ​​the explosion-proof valve 3.

[0039] Understandably, in order to ensure the smooth exhaust of high-temperature gas through the connecting hole 121, the total area of ​​the connecting hole 121 in this embodiment is larger than the exhaust area of ​​the explosion-proof valve 3, so that the high-temperature gas passing through the connecting hole 121 can quickly enter the interlayer space 13 and will not accumulate between the electrode group 2 and the shell 1, thus avoiding the obstruction of high-temperature exhaust by the second side plate.

[0040] like Figure 1 As shown, this embodiment has multiple connecting holes 121, which are evenly spaced on the second plate 12.

[0041] Understandably, in order to accelerate the speed at which the high-temperature exhaust gas from the electrode assembly 2 enters the interlayer space 13 from the receiving cavity, this embodiment provides multiple connecting holes 121. Furthermore, in order to ensure the uniformity of the high-temperature exhaust gas entering the interlayer space 13, the multiple connecting holes 121 in this embodiment are evenly spaced on the second plate 12, so that the high-temperature exhaust gas enters the interlayer space 13 from the evenly spaced exhaust channels. Along the length direction of the shell 1, the impact force of the high-temperature exhaust gas on the first plate 11 is relatively uniform, avoiding cracking or deformation of the shell 1 caused by excessive force at a certain point, and ensuring the reliability of the first plate 11 and the second plate 12.

[0042] like Figure 1 As shown, the connecting hole 121 in this embodiment is a circular hole, and the diameter of the multiple circular holes is the same.

[0043] Understandably, when multiple connecting holes 121 are evenly spaced on the second plate 12, since the radius of curvature of the circular holes is the same and there are no sharp corners, the stress concentration factor 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 obtained by drilling.

[0044] Furthermore, since the diameters of the multiple circular holes are the same, the cross-sectional area distribution of the remaining part on the second plate 12 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 makes the processing of the connecting holes 121 with the same hole diameter easier, thus improving the processing efficiency of the second plate 12.

[0045] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, the wall thickness of the side of the housing 1 with the mounting hole 111 along the height direction of the housing 1 is H, and the wall thickness of the other side of the housing 1 is h, satisfying: H>h, and 0.8mm≤H≤3mm, 0.3mm≤h≤1.5mm.

[0046] Understandably, since the side where the mounting hole 111 is located needs to be opened to install the explosion-proof valve 3, and the first plate 11 and the second plate 12 need to be set at intervals, the required dimensions along the height direction of the housing 1 are large, and the wall thickness H of the side where the mounting hole 111 is located is thicker. The side adjacent to the side where the mounting hole 111 is located only needs to cover the housing of the pole group 2, and can use a thinner wall thickness h.

[0047] Specifically, the wall thickness H of the side where the mounting hole 111 is located can be 0.8mm, 1.9mm, or 3mm. The wall thickness h of the side where the mounting hole 111 is located can be 0.3mm, 0.9mm, or 1.5mm.

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, along the height direction of the shell 1, the thickness of the first plate 11 is H2, the thickness of the second plate 12 is H1, and the height of the interlayer space 13 is H3, satisfying: H1≥h, H2≥h, 40%≤H3 / H≤75%.

[0049] Understandably, by Figure 3 From the relative relationships, we know that H = H1 + H2 + H3. Since the interlayer space 13 between the first plate 11 and the second plate 12 in the shell 1 will reduce the rigidity and strength of the shell 1, in order to ensure the strength of the side of the shell 1 with the mounting hole 111, the thickness H1 of the second plate 12 needs to be greater than the wall thickness h of the side of the shell 1 adjacent to the side where the mounting hole 111 is located, and the thickness H2 of the first plate 11 also needs to be greater than the wall thickness h of the side of the shell 1 adjacent to the side where the mounting hole 111 is located. Furthermore, the height H3 of the interlayer space 13 and the wall thickness h of the side adjacent to the side where the mounting hole 111 is located need to meet a certain range, which needs to meet both the strength requirements of the shell 1 and the venting requirements of the interlayer space 13.

[0050] Specifically, H3 / H can be 40%, 57.5%, or 75%.

[0051] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, along the width direction of the housing 1, the width of the outer wall of the side where the mounting hole 111 is located is w, and the width of the interlayer space 13 is w1. w and w1 satisfy: 30%≤w1 / w≤80%.

[0052] Understandably, since the two ends of the first plate 11 and the second plate 12 are connected to the adjacent side of the shell 1, the width w of the outer wall of the side where the mounting hole 111 is located and the width w1 of the interlayer space 13 need to meet a certain range to ensure that the first plate 11 and the second plate 12 can meet the strength requirements and that the interlayer space 13 between the first plate 11 and the second plate 12 can be used for venting.

[0053] Specifically, the ratio of w1 / w can be 30%, 55%, or 80%.

[0054] like Figure 4 , Figure 5 and Figure 6 As shown, a reinforcing rib 14 is provided between the first plate 11 and the second plate 12 in this embodiment, and the reinforcing rib 14 is arranged on the side of the connecting hole 121.

[0055] Understandably, since there is a sandwich space 13 between the first plate 11 and the second plate 12, in order to strengthen the connection between the first plate 11 and the second plate 12, this embodiment provides a reinforcing rib 14 between the first plate 11 and the second plate 12. The two ends of the reinforcing rib 14 abut against the first plate 11 and the second plate 12 respectively to support the first plate 11 and the second plate 12, ensuring the structural strength of the first plate 11 and the second plate 12.

[0056] like Figure 4 , Figure 5 and Figure 6 As shown, the intersection of the first plate 11 and the second plate 12 with the side of the adjacent shell 1 in this embodiment is provided with a chamfer.

[0057] Understandably, in order to ensure that the electrode assembly 2 is not scratched by the edges of the first plate 11 and the second plate 12 when it is installed with the housing 1, this embodiment provides chamfers on the edges of both the first plate 11 and the second plate 12 so that the edges of the first plate 11 and the second plate 12 can be smoothly connected.

[0058] Specifically, a chamfer can be a right-angle chamfer or a rounded chamfer.

[0059] Secondly, such as Figure 7 and Figure 8 As shown, this embodiment provides a battery, including: a casing 1, an electrode group 2, an explosion-proof valve 3, and a top cover 4.

[0060] The housing 1 is as described above; the pole assembly 2 is disposed in the receiving cavity and abuts against the inner wall of the side of the housing 1 with the mounting hole 111; the explosion-proof valve 3 is embedded in the mounting hole 111; and the top cover 4 is placed on the opening end of the receiving cavity.

[0061] Specifically, since the battery includes a casing 1, and the specific structure of the casing 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.

[0062] It is understood that the top cover 4 in this embodiment is provided in two parts, namely a positive top cover and a negative top cover, which are respectively placed on both ends of the housing 1.

[0063] Since the explosion-proof valve 3 is usually placed on the lower side of the battery, it vents air outwards towards the lower part of the housing 1. The electrode assembly 2 and the electrolyte are both pressed onto the side of the housing 1 with the mounting hole 111. In this embodiment, the side of the housing 1 with the mounting hole 111 is provided with a first plate 11 and a second plate 12. The interlayer space 13 between the first plate 11 and the second plate 12, the connecting hole 121 of the second plate 12, and the explosion-proof valve 3 are connected to form an exhaust channel for the discharge of high-temperature gases when the battery experiences thermal runaway, so that the explosion-proof valve 3 can be opened in time, ensuring the safety and reliability of the battery.

[0064] 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. Such 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 casing for use in a battery, characterized in that, The housing has a receiving cavity, and one side of the housing in the height direction has a mounting hole for installing an explosion-proof valve; the side where the mounting hole is located includes a first plate and a second plate, the first plate and the second plate are spaced apart to form a sandwich space, the first plate has the mounting hole, the second plate is located on the side of the first plate facing the receiving cavity, the second plate has a through hole, and the explosion-proof valve, the sandwich space and the through hole form an exhaust channel.

2. The housing according to claim 1, characterized in that, The area of ​​the connecting hole is larger than the exhaust area of ​​the explosion-proof valve.

3. The housing according to claim 2, characterized in that, The connecting holes are provided in multiple ways, and the multiple connecting holes are evenly spaced on the second plate.

4. The housing according to claim 3, characterized in that, The connecting hole is a circular hole, and multiple circular holes have the same diameter.

5. The housing according to claim 1, characterized in that, Along the height direction of the housing, the wall thickness of the side of the housing with the mounting hole is H, and the wall thickness of the other sides of the housing is h, satisfying: H>h, and 0.8mm≤H≤3mm, 0.3mm≤h≤1.5mm.

6. The housing according to claim 5, characterized in that, Along the height direction of the shell, the thickness of the first plate is H2, the thickness of the second plate is H1, and the height of the interlayer space is H3, satisfying: H1≥h, H2≥h, 40%≤H3 / H≤75%.

7. The housing according to claim 1, characterized in that, Along the width direction of the housing, the width of the outer wall of the side where the mounting hole is located is w, and the width of the interlayer space is w1. w and w1 satisfy: 30%≤w1 / w≤80%.

8. The housing according to claim 1, characterized in that, A reinforcing rib is provided between the first plate and the second plate, and the reinforcing rib is arranged on the side of the connecting hole.

9. The housing according to claim 1, characterized in that, The first plate and the second plate are both chamfered at the intersections with the sides of the adjacent shell.

10. A battery, characterized in that, include: A housing, the housing as described in any one of claims 1 to 9; The electrode assembly is disposed within the receiving cavity and abuts against the inner wall of the side of the housing with the mounting hole; An explosion-proof valve, wherein the explosion-proof valve is embedded in the mounting hole; A top cover is provided at the opening end of the receiving cavity.

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