Cylindrical battery device

Abstract

This application provides a cylindrical battery device, including a cylindrical battery, a sealant, and a bracket. The bracket includes a bottom plate located on the bottom side of the cylindrical battery. The bottom end of the cylindrical battery has a pressure relief area. The sealant includes a sealant ring portion surrounding the pressure relief area. The sealant ring portion is sealed to the cylindrical battery, and its bottom end face is sealed to the top surface of the bottom plate. After the cylindrical battery is placed inside the battery housing, it needs to be fixed with glue. Due to the blocking effect of the sealant ring portion, the glue in the battery housing will not flow onto the pressure relief area of ​​the cylindrical battery, thus not affecting the smooth opening of the pressure relief area during thermal runaway, thereby ensuring safety during thermal runaway.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cylindrical battery device. Background Technology

[0002] After the cylindrical batteries are assembled into the casing, they need to be fixed with glue. During the glue application process, the glue can easily overflow onto the explosion-proof valve at the end of the cylindrical battery, which can affect the timely opening of the explosion-proof valve in the event of thermal runaway. Therefore, how to avoid the adverse effect of glue overflow on the opening of the explosion-proof valve is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0003] To solve the above-mentioned technical problems, this application provides a cylindrical battery device, which includes a cylindrical battery, a sealant, and a bracket. The bracket includes a bottom plate located on the bottom side of the cylindrical battery. The bottom end of the cylindrical battery is provided with a pressure relief area. The sealant includes a sealant ring portion, which surrounds the outside of the pressure relief area. The sealant ring portion is sealed to the cylindrical battery, and the bottom end face of the sealant ring portion is sealed to the top surface of the bottom plate.

[0004] After the cylindrical battery is placed inside the battery housing, it needs to be fixed with glue. In the above technical solution, because the glue-blocking ring is set outside the pressure relief area, the bottom end face of the glue-blocking ring is sealed to the top surface of the bottom support plate, and the glue-blocking ring is sealed to the cylindrical battery, the glue in the battery housing will not flow onto the pressure relief area of ​​the cylindrical battery, thus not affecting the smooth opening of the pressure relief area in the event of thermal runaway, thereby ensuring safety in the event of thermal runaway. Attached Figure Description

[0005] Figure 1 A partial perspective view of the first embodiment of the cylindrical battery device provided in this application;

[0006] Figure 2 for Figure 1 A 3D view of a single cylindrical battery;

[0007] Figure 3 for Figure 2 Another perspective view;

[0008] Figure 4 for Figure 1 A three-dimensional view of the central bracket;

[0009] Figure 5 for Figure 1 A three-dimensional view of the mid-frame;

[0010] Figure 6 for Figure 1 Another perspective view;

[0011] Figure 7 for Figure 1 Top view;

[0012] Figure 8 for Figure 7 A sectional view along line AA, the side support plate is hidden in the figure;

[0013] Figure 9 for Figure 8 A magnified view of the location of the middle-section rubber component;

[0014] Figure 10 A partial cross-sectional view of the location of the baffle in the second embodiment of the cylindrical battery device provided in this application;

[0015] Figure 11 A partial cross-sectional view of the location of the baffle in the third embodiment of the cylindrical battery device provided in this application;

[0016] Figure 12 A partial cross-sectional view of the location of the baffle in the fourth embodiment of the cylindrical battery device provided in this application;

[0017] Figure 13 A partial cross-sectional view of the location of the baffle in the fifth embodiment of the cylindrical battery device provided in this application;

[0018] Figure 14 A partial cross-sectional view of the location of the baffle in the sixth embodiment of the cylindrical battery device provided in this application;

[0019] Figure 15 for Figure 9 or Figure 12 3D view of the middle-section rubber component;

[0020] Figure 16 for Figure 10 or Figure 11 3D view of the middle-section rubber component;

[0021] Figure 17 for Figure 13 or Figure 14 A 3D view of the middle-section rubber component.

[0022] Figures 1-17 The annotations in the accompanying drawings are explained as follows:

[0023] 100 Cylindrical battery, 101 Casing, 102 Terminals, 103 Scratches;

[0024] 200 rubber baffle, 201 rubber baffle ring, 202 rubber baffle plate, 203 hollow hole;

[0025] 300 bracket, 301 base plate, 301a vent, 302 fifth side wall, 303 sixth side wall;

[0026] 400 Frame, 401 Base plate, 401a Explosion-proof valve mounting hole, 402 First side wall, 403 Second side wall, 404 Third side wall, 405 Fourth side wall;

[0027] 501 Exhaust compartment, 502 Battery storage compartment;

[0028] 600 side limiting plate;

[0029] 700 explosion-proof valve. Detailed Implementation

[0030] This application provides a cylindrical battery device. In order to enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, in this embodiment (first embodiment), the cylindrical battery device includes a cylindrical battery 100, a bracket 300, and a frame 400. The bracket 300 and the frame 400 enclose a battery receiving compartment 502, and the cylindrical batteries 100 are located within the battery receiving compartment 502 and arranged in multiple rows.

[0032] like Figure 2 As shown, the cylindrical battery 100 includes a casing 101 and terminals 102. A battery cell is disposed inside the casing 101, and the battery cell includes a cell body, a positive electrode tab, and a negative electrode tab. The cell body can be a wound structure or a stacked structure. The cell body includes a positive electrode plate, a negative electrode plate, and a separator located between the positive and negative electrode plates. The terminals 102 are disposed at the top of the cylindrical battery 100. In this embodiment, one terminal 102 is provided, one polarity electrode tab is electrically connected to the terminal 102, and the other polarity electrode tab is electrically connected to the casing 101. Alternatively, two terminals 102 can be provided, with two polarity electrode tabs electrically connected to the two terminals 102 respectively.

[0033] like Figure 3 As shown, the bottom of the cylindrical battery 100 is provided with a pressure relief area, which can burst open to release pressure in the event of thermal runaway. In this embodiment, a ring-shaped groove 103 is provided on the bottom wall of the casing 101 of the cylindrical battery 100, and the area inside the ring-shaped groove 103 on the bottom wall of the casing 101 is the pressure relief area. Alternatively, the pressure relief area can also be formed by locally thinning the bottom wall of the casing 101 of the cylindrical battery 100.

[0034] like Figure 4As shown, the bracket 300 includes a base plate 301, a fifth side wall 302, and a sixth side wall 303, with the fifth side wall 302 and the sixth side wall 303 respectively disposed on opposite sides of the base plate 301. The base plate 301 is located on the bottom side of the cylindrical battery 100. A vent 301a is provided on the base plate 301 directly opposite each cylindrical battery 100. The orthographic projection of the pressure relief area of ​​each cylindrical battery 100 on the base plate 301 at least partially overlaps with each vent 301a. Preferably, the orthographic projection of the pressure relief area of ​​each cylindrical battery 100 on the base plate 301 falls completely within one of the vent 301a on the base plate 301.

[0035] like Figure 5 As shown, the frame 400 includes a base plate 401, a first side wall 402, a second side wall 403, a third side wall 404, and a fourth side wall 405. The first side wall 402 and the second side wall 403 are respectively disposed on opposite sides of the base plate 401, and the third side wall 404 and the fourth side wall 405 are respectively disposed on the other opposite sides of the bottom. The height of the third side wall 404 and the fourth side wall 405 is less than the height of the first side wall 402 and the second side wall 403. The base plate 401 is provided with an explosion-proof valve mounting hole 401a.

[0036] like Figure 6 and Figure 8 As shown, the bottom end of the fifth side wall 302 is fixed to the inner side of the third side wall 404, and the bottom end of the sixth side wall 303 is fixed to the inner side of the fourth side wall 405. For example, they can be fixed by welding. During welding, the position of the positioning bracket 300 can be relied upon by the positioning fixture. Alternatively, positioning protrusions can be provided on the inner sides of the third side wall 404 and the fourth side wall 405, so that the bottom end faces of the fifth side wall 302 and the sixth side wall 303 abut against the positioning protrusions to achieve the positioning of the bracket 300. The bottom support plate 301 is located between the third side wall 404 and the fourth side wall 405. An exhaust chamber 501 is formed between the bottom support plate 301 and the bottom plate 401. An explosion-proof valve 700 is provided on the bottom plate 401. The explosion-proof valve 700 can be assembled at the explosion-proof valve mounting hole of the bottom plate 401. In the event of thermal runaway, the high-temperature gas flow is discharged from the pressure relief area of ​​the cylindrical battery 100, enters the exhaust chamber 501 through the exhaust hole 301a on the bottom plate 301, and then is discharged to the outside of the battery device through the exploded explosion-proof valve 700.

[0037] like Figure 7 As shown, the cylindrical battery device may include a side limiting plate 600. A side limiting plate 600 is provided between every two adjacent rows of cylindrical batteries 100, and the side limiting plate 600 is fixed between the first side wall 402 and the second side wall 403 of the frame 400. The side limiting plate 600 has an arc surface adapted to the outer peripheral surface of the cylindrical battery 100, which can limit the movement of the cylindrical battery 100.

[0038] like Figure 8and Figure 9 As shown, the cylindrical battery device includes a sealant 200, which includes a sealant ring 201. The sealant ring 201 surrounds the outer side of the pressure relief area. The bottom end face of the sealant ring 201 is sealed to the top surface of the base plate 301. The sealant ring 201 is sealed to the cylindrical battery 100. In this embodiment, the sealant ring 201 is sleeved on the outer side of the bottom end of the cylindrical battery 100, and the inner circumferential surface of the sealant ring 201 is sealed to the outer circumferential surface of the cylindrical battery 100. The inner side of the sealant ring 201 is a cavity (combined with...). Figure 15 (Understanding) In other words, the adhesive baffle 200 is a ring-shaped structure, the bottom end of the cylindrical battery 100 is inserted inside the ring-shaped adhesive baffle 200, and the bottom end of the cylindrical battery 100 abuts against the top surface of the bottom support plate 301.

[0039] When the retaining ring 201 is fitted onto the outer side of the bottom end of the cylindrical battery 100, the outer diameter D1 of the retaining ring 201 is larger than the outer diameter D2 of the cylindrical battery 100, that is, 1 < D1 / D2. When the retaining ring 201 is fitted onto the outer side of the bottom end of the cylindrical battery 100, it is preferable that D1 / D2 ≤ 1.15. For example, D1 / D2 can be equal to 1.01, 1.05, 1.10, or 1.15. If D1 / D2 is too large when D2 is constant, it means that D1 is too large. A large D1 affects the energy density of the battery device and also increases the cost of the retaining member 200. Controlling the value of D1 / D2 to ≤ 1.15 can ensure higher energy density and lower cost.

[0040] After the cylindrical battery 100 is placed inside the battery housing 502, it needs to be fixed with glue. Since the glue-blocking ring 201 surrounds the outside of the pressure relief area, and the bottom end face of the glue-blocking ring 201 is sealed to the top face of the bottom support plate 301, and the glue-blocking ring 201 is sealed to the cylindrical battery 100, the glue in the battery housing 502 will not flow onto the pressure relief area of ​​the cylindrical battery 100, thus not affecting the smooth opening of the pressure relief area during thermal runaway, thereby ensuring safety during thermal runaway.

[0041] like Figure 10 As shown, the difference between this embodiment (the second embodiment) and the first embodiment described above is that the inner side of the adhesive-blocking ring portion 201 is not a cavity, and an adhesive-blocking plate portion 202 is provided on the inner side of the adhesive-blocking ring portion 201. The adhesive-blocking plate portion 202 abuts against the bottom end surface of the cylindrical battery 100 and the top surface of the bottom support plate 301. Figure 16 As shown, the adhesive baffle 200 can be provided with perforated holes 203 to reduce the weight of the adhesive baffle 200. The perforated holes 203 can be provided in the area where the adhesive baffle 200 is directly opposite the pressure relief area of ​​the cylindrical battery 100, or they can be provided in the area where the pressure relief area of ​​the adhesive baffle 200 is offset from the pressure relief area of ​​the cylindrical battery 100.

[0042] Preferably, the adhesive-blocking member 200 is an elastic member, and the adhesive-blocking member 200 is at least partially located between the bottom end face of the cylindrical battery 100 and the top surface of the bottom support plate 301, for example, Figure 10 In the illustrated embodiment, the sealant portion 202 is located between the bottom end face of the cylindrical battery 100 and the top surface of the base plate 301. This allows the elastic deformation of the sealant 200 to reduce the height difference between the cylindrical batteries 100, improving the overall assembly tightness of the cylindrical battery assembly. Furthermore, when the sealant 200 is an elastic element, it can achieve a sealed connection with the cylindrical battery 100 and the base plate 301 through its own elasticity. Of course, to improve the reliability of the sealed connection, adhesive can also be applied to the contact surfaces between the sealant 200 and the cylindrical battery 100, and between the sealant 200 and the base plate 301, for bonding.

[0043] Preferably, the maximum height H of the sealant 200 is in the range of 1mm ≤ H ≤ 3mm. For example, H can be equal to 1mm, 1.5mm, 2mm, 2.5mm, or 3mm. For an elastic sealant 200, its maximum height refers to the maximum height in its natural state (i.e., without compression or stretching). If the maximum height of the sealant 200 is too large, it will reduce the energy density of the battery device. If the maximum height of the sealant 200 is too small, it will result in a weak sealing connection between the sealant 200 and the cylindrical battery 100 and the base plate 301, thereby affecting the sealant blocking effect. By controlling the maximum height H of the sealant 200 within the above range, both the energy density of the battery device and the sealant blocking effect of the sealant 200 can be balanced.

[0044] like Figure 11 As shown, this embodiment (third embodiment) differs from the second embodiment described above in that the baffle plate portion 202 has a weak area. On the top surface of the bottom support plate 301, the orthographic projection of the weak area and the orthographic projection of the pressure relief area of ​​the cylindrical battery 100 at least partially overlap, preferably the orthographic projection of the pressure relief area of ​​the cylindrical battery 100 falls completely within the orthographic projection of the weak area. In the event of thermal runaway, the weak area is easily broken through and easily detached from the baffle plate portion 202 body, thereby facilitating the rapid discharge of high-temperature airflow. Specifically, the weak area can be formed by providing grooves or locally thinning the baffle plate portion 202.

[0045] like Figure 12 As shown, the difference between this embodiment (fourth embodiment) and the first embodiment described above is that the adhesive-blocking ring 201 is located between the bottom end face of the cylindrical battery 100 and the top end face of the bottom support plate 301, and the top end face of the adhesive-blocking ring 201 is sealed to the bottom end face of the cylindrical battery 100.

[0046] When the seal ring 201 is located between the bottom end face of the cylindrical battery 100 and the top surface of the base plate 301, the outer diameter D1 of the seal ring 201 can be less than, equal to, or greater than the outer diameter D2 of the cylindrical battery 100. When the seal ring 201 is located between the bottom end face of the cylindrical battery 100 and the top surface of the base plate 301, the ratio of the outer diameter D1 of the seal ring 201 to the outer diameter D2 of the cylindrical battery 100 is preferably in the range of 0.65 ≤ D1 / D2 < 1. For example, D1 / D2 is equal to 0.65, 0.7, 0.75, 0.8, 0.95, or 0.98. By controlling the value of D1 / D2 to <1, some adhesive can enter between the bottom surface of the cylindrical battery 100 and the base plate 301, thus bonding the cylindrical battery 100 and the base plate 301 and improving the positional stability of the cylindrical battery 100. In addition, if D1 / D2 is too small when D2 is constant, it means that D1 is too small. If D1 is too small, the adhesive-blocking ring 201 will not be able to surround the outside of the pressure relief area of ​​the cylindrical battery 100, affecting the adhesive-blocking effect and even hindering the bursting of the pressure relief area. Controlling the value of D1 / D2 to ≥0.65 can ensure the adhesive-blocking effect and safety in case of thermal runaway.

[0047] like Figure 13 As shown, the difference between this embodiment (the fifth embodiment) and the fourth embodiment described above is that the inner side of the adhesive-blocking ring portion 201 is not a cavity, but is provided with an adhesive-blocking plate portion 202. The adhesive-blocking plate portion 202 abuts against the bottom end surface of the cylindrical battery 100 and the top surface of the bottom support plate 301. Figure 17 As shown, the adhesive baffle 200 can be provided with perforated holes 203 to reduce the weight of the adhesive baffle 200. The perforated holes 203 can be provided in the area where the adhesive baffle 200 is directly opposite the pressure relief area of ​​the cylindrical battery 100, or they can be provided in the area where the pressure relief area of ​​the adhesive baffle 200 is offset from the pressure relief area of ​​the cylindrical battery 100.

[0048] like Figure 14 As shown, this embodiment (sixth embodiment) differs from the fifth embodiment described above in that the baffle plate portion 202 has a weak area. On the top surface of the bottom support plate 301, the orthographic projection of the weak area and the orthographic projection of the pressure relief area of ​​the cylindrical battery 100 at least partially overlap, preferably the orthographic projection of the pressure relief area of ​​the cylindrical battery 100 falls completely within the orthographic projection of the weak area. In this way, during thermal runaway, the weak area is easily broken through or easily detached from the baffle plate portion 202 body, thereby facilitating the rapid discharge of high-temperature airflow. Specifically, the weak area can be formed by providing grooves or locally thinning the baffle plate portion 202.

[0049] The above examples illustrate the principles and implementation methods of this application. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A cylindrical battery device, characterized in that, The cylindrical battery device includes a cylindrical battery (100), a sealant (200), and a bracket (300). The bracket (300) includes a bottom plate (301) located on the bottom side of the cylindrical battery (100). The bottom end of the cylindrical battery (100) is provided with a pressure relief area. The sealant (200) includes a sealant ring (201) which surrounds the outside of the pressure relief area. The sealant ring (201) is sealed to the cylindrical battery (100), and the bottom end face of the sealant ring (201) is sealed to the top surface of the bottom plate (301).

2. The cylindrical battery device according to claim 1, characterized in that, The sealing ring (201) is fitted around the bottom of the cylindrical battery (100), and the inner circumferential surface of the sealing ring (201) is sealed to the outer circumferential surface of the cylindrical battery (100).

3. The cylindrical battery device according to claim 2, characterized in that, The ratio of the outer diameter D1 of the rubber-blocking ring (201) to the outer diameter D2 of the cylindrical battery (100) is: 1 < D1 / D2 ≤ 1.

15.

4. The cylindrical battery device according to claim 1, characterized in that, The adhesive-blocking ring (201) is located between the bottom end face of the cylindrical battery (100) and the top surface of the base plate (301), and the top end face of the adhesive-blocking ring (201) is sealed to the bottom end face of the cylindrical battery (100).

5. The cylindrical battery device according to claim 4, characterized in that, The outer diameter D1 of the rubber-blocking ring (201) is smaller than the outer diameter D2 of the cylindrical battery (100).

6. The cylindrical battery device according to claim 5, characterized in that, The ratio of the outer diameter D1 of the rubber-blocking ring (201) to the outer diameter D2 of the cylindrical battery (100) is: 0.65≤D1 / D2<1.

7. The cylindrical battery device according to any one of claims 1-6, characterized in that, The adhesive baffle (200) includes an adhesive baffle plate (202) which is disposed inside the adhesive baffle ring (201). The adhesive baffle plate (202) is located between the bottom end face of the cylindrical battery (100) and the top face of the bottom support plate (301). The adhesive baffle plate (202) has a weak area. The pressure relief area and the weak area at least partially overlap in their orthographic projections on the top face of the bottom support plate (301).

8. The cylindrical battery device according to claim 7, characterized in that, The adhesive baffle (200) is provided with a hollow hole (203), which is located on the area of ​​the adhesive baffle (200) directly opposite the pressure relief area and / or on the area of ​​the adhesive baffle (200) offset from the pressure relief area.

9. The cylindrical battery device according to any one of claims 1-6, characterized in that, The adhesive barrier (200) is an elastic element, and the maximum height H of the adhesive barrier (200) is in the range of 1mm≤H≤3mm.

10. The cylindrical battery device according to any one of claims 1-6, characterized in that, The cylindrical battery device includes a frame (400) and a bracket (300) fixedly connected. The frame (400) and the bracket (300) together enclose a battery housing (502) and an exhaust chamber (501). An exhaust hole (301a) is provided on the bottom plate (301) opposite to each of the cylindrical batteries (100). The exhaust hole (301a) connects the battery housing (502) and the exhaust chamber (501).

11. The cylindrical battery device according to claim 10, characterized in that, The frame (400) includes a base plate (401), a first side wall (402) and a second side wall (403) located on opposite sides of the base plate (401), and a third side wall (404) and a fourth side wall (405) located on the other opposite sides of the base plate (401). The height of the third side wall (404) and the fourth side wall (405) is less than the height of the first side wall (402) and the second side wall (403). The bracket (300) The device includes a fifth side wall (302) and a sixth side wall (303) located on opposite sides of the base plate (301). The bottom end of the fifth side wall (302) is fixed to the inside of the third side wall (404), and the bottom end of the sixth side wall (303) is fixed to the inside of the fourth side wall (405). The exhaust chamber (501) is located between the base plate (301) and the base plate (401). An explosion-proof valve (700) is provided on the base plate (401).

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